|Title of Invention||
A LOUVRE WINDOW SYSTEM
|Abstract||A louvre window system has an end clip (10) which is formed with at least one internal drainage channel (14) which can drain water through the end clip (10). A number of such clips can rotate between an open position and a closed position. The clips (10) are aligned when in the closed position which means that water can drain from an upper clip through a lower clip. The clips (10) have a low friction design which means that a larger number of louvres can be rotated by a single handle without placing too much load on the handle and on the louvre operating mechanism. A simple efficient louvre operating mechanism is used to operate the end clips. (FIG.1).|
|Full Text||A LOUVRE WINDOW SYSTEM
FIELD OF THE INVENTION
This invention is related to a louvre system for louvre windows,
and particularly for louvre windows comprising glass, metal, timber, plastic
blades etc, and comprises a plurality of improvements to existing louvre
systems, these improvements being directed to improvements to reducing
water penetration and to drain water- from a louvre window, and
improvements to the louvre operating system by which louvre blades can be
opened and closed together. Other improvements to the louvre system will
also become apparent.
Louvre windows consist of a surround frame formed of upper
and lower horizontal frame portions and opposed side frame portions which
are fastened together. The frame supports an array of horizontal louvres
which pivot about horizontal pivot pins between louvre open and louvre closed
positions. It is known to tip the frame on its side such that the louvres extend
vertically, however the invention will be described with respect to horizontally
extending louvre blades.
For louvre windows, the blades are typically formed of glass (but
can be made of other material) and are rectangular when viewed in plan. The
blades can have a length of anywhere between 20 to 120cm, a width of
between 10 to 40cm, and a thickness of between 4 to 20mm.
As it is not practical to drill holes in glass blades, it is usual for
the blades to be supported by end clips. One end clip is pivotally attached to
one side frame portion and the other end clip is pivotally attached to the other
side frame portion. It is normal for the end clips on one side frame portion to
be functionally attached together such that all the end clips can be rotated by
a louvre operating mechanism. The end clips on the other side frame portion
can usually pivot independently.
In order to reduce water penetration through the louvre window,
the blades are in an overlapping configuration when closed, which means that
a lower longitudinal edge of an upper blade overlaps the uppei longitudinal
edge of an adjacent lower blade. It is also known to have end clips
SUBSTITUTE SHEET (RULE 26)
configured to seal against each other to minimise water penetration through
the end clips. The configuration of the end clip includes a longitudinal rib
which seals against the U-shaped aluminium channel as the end clip pivots
from the open position to the closed position.
Notwithstanding many attempts to redesign the end clip, water
still penetrates through the join between one end clip and a second end clip
when the clips are in the closed position. This is exacerbated when there is
also a pressure differential between the front of the louvre and the rear of the
louvre. A pressure differential often occurs during sudden storms where the
pressure inside the room can be appreciably lower than the outside pressure
resulting in an air/water mixture being forced between the end clips when the
louvres are in the closed position.
Overlapping blades are not very effective in preventing water
penetration. Under strong wind and rain conditions, water can be forced
uphill between the overlapping closed blades and into the interior of the
louvre window. One way to minimise this is to increase the degree of overlap
but this increases the size and weight of a louvre window and reduces optical
One form of the present invention is to provide a redesigned
end clip which now has at least one drainage channel to drain water which
may pass between one end clip and another end clip. Suitably, a number of
drainage channels are provided to greatly reduce the possibility of water
penetrating entirely through the end clips
Conventional louvre operating mechanisms rotate the end clips
on one side frame portion by engaging with and rotating the pivot pins. The
mechanism is simple as the louvre pivots about a central portion which
means that the pivot pin is easily accessible to the mechanism.
A particular disadvantage with conventional louvre mechanisms
is the rather large load placed on the operating mechanism when opening or
closing a louvre window of the type described above. This requires
components to be made of strong material, usually steel which adds to the
manufacturing cost. As well, it can be difficult for a person to manipulate a
conventional operating mechanism due to the larger loads.
The main reason for the relatively large load being placed on
operating mechanism is due to the end clip frictionally engaging with the Li-
shaped channel as the end clip moves either from the closed position to the
open position or from the open position to the closed position. The reason for
this is that the end clip is provided with a longitudinal sealing rib or bead
which wipes across the U-shaped channel as the clip rotates to the closed
position, or awayfrom the closed position. This wiping action places a load
on the operating system, and therefore a restriction is placed on the number
of louvre blades which can be rotated by a single operating system, typically
to about six blades.
It would be an advantage to rotate more blades using a single
handle without jeopardising or reducing the sealing action of the end clip.
The reason why it would be an advantage is in being able to align the handles
horizontally when a number of separate louvre windows are positioned in a
single room. That is, if a room contains, say, 3 banks of louvre windows, it is
aesthetically pleasing if the handles could all be at the same distance either
from the ground or from the ceiling (that is aligned horizontally). Furthermore,
if a handle could operate a large number of blades without damaging or
destroying the operating mechanism, greater versatility would be present in
placement of the handles, not only for aesthetic appeal, but also to allow
mobility impaired persons (such as wheelchair persons) to operate a louvre
window where are otherwise the handle may be placed in a position which is
too high (or too low) for easy access by the mobility impaired person.
However it is not possible to simply remove the sealing rib on
the end clip in order to reduce the load placed on the operating system, as
this will now reduce the weatherproofmg of the entire louvre window.
It is known to open larger louvre structures using assistance
from pneumatic rams, but this requires pressure piping to be installed around
the frame and greatly adds to the cost. Large helical springs have also been
used to assist in movement of larger louvres (typically steel or metal louvres)
for fire ventilation.
Various types of louvre actuating devices are known to open
and close the louvre blades. A typical and very common louvre operating
mechanism comprises a pair of flat metal rods which are positioned within the
U-shaped channel. The louvre end clip is attached to the bearing. The
bearing has a rear face containing two spaced apart stubby pins. One metal
rod is attached to one of the pins and the other metal rod is attached to the
other pin. The rods reciprocate in opposite directions and are controlled by
an external handle. Movement of the handle either upwardly or downwardly
causes one of the rods to move one way and the other rod to move the other
way which in turn rotates the bearing and therefore the end clip and therefore
the louvre between the closed and the open positions. The pair of flat metal
rods connects between 4-6 end clips to rotate together upon operation of the
With this system, the short stubby pins which are attached to the
bars exhibit quite strong forces upon operation of the louvre operating
mechanism. Importantly, these pins exhibit a bending force as well as a
shear force. While the pins are typically strong enough to withstand the shear
forces, it is found that most failure of the louvre operating mechanism occurs
when the pins break due to the bending force. Therefore, it would be an
advantage if it was possible to develop a louvre operating mechanism which
would place less bending force on the pins.
Another disadvantage with this conventional system is the
requirement to process and assemble two bars into the U-shaped channel as
part of the manufacture of the operating system. The heads of the pins need
to be permanently deformed to hold the bars in position. This requires
specialised assembly equipment, and once the operating system is
assembled no part of the assembly can be readily replaced. Therefore, if,
say, one of the pins is damaged, it is necessary to remove the entire louvre
operating system and to replace it. This is quite expensive and laborious.
It is known to provide a louvre operating mechanism which has
only a single bar. This provides certain advantages over the assembly
described above. Typically, the single bar is a rack and pinion system where
the bar is provided with a rack (a type of tooth structure), and the bearing (to
which the end clip is attached) is provided with some sort ot pinion
arrangement. It is essential that the teeth on the rack and the teeth on the
pinion are formed in the correct shape which requires both to be moulded
components. The bar containing the rack is formed into smaller sections
which are joined together such that the required number of blades can be
operated with a single handle. It is extremely important that the spacing
between the racks on the bar is exactly correct, otherwise operation of the
handle will result in louvre blades closing or opening in a nonuniform manner.
For instance, one louvre blade could be in the fully closed position while an
adjacent louvre blade is in the almost closed position and this is certainly
undesirable. Therefore, the manufacture and the assembly of this type nf
louvre operating system is expensive and requires extreme accuracy.
The large majority of louvre systems manufactured in the world today
rely on a simple handle and link systems to operate the louvre mechanism
(open and close the louvre blades). This simple handle/link also provides
complete and positive closure of the window by means of the handle/link joint
being forced over-centre via an intuitive action of pushing the handle into a
The handle/link joint is constructed using a purpose made rivet or stud
with the link being attached to either the top or bottom face of the handle The
method of attaching the link to one face of the handle via a rivet results in
flexing of this joint when locking -(over centre closing)- pressure is applied to
the system (tests have confirmed that there Is a correlation between locking
pressure, blade to blade contact, and water penetration resistance). Because
one member is placed on top of the other member and then joined together
via a rivet, the acting/reacting forces are not in alignment with each other
which introduces a bending moment at the joint, which in turn results in
flexing of the joint. This flexing of the joint ultimately results in failure of the
joint (the most common failure being that the rivet either breaks, or pulls out
of the link).
It would be an advantage if if were possible to minimise or
eliminate this disadvantage.
Australian patent application 23966/88 is directed to a louvre clip
assembly. The assembly has a louvre clip containing internal voids. The
voids are weight reducing voids and do not appear to be used for any draining
Australian patent application 23297/95 describes a louvre
system containing last louvres and metal louvres. The lower end of the metal
louvre is curved to form a gutter. The gutter drains water from the louvre into
the vertical side jamb, which is provided with a drainage hole to drain water to
the bottom and to the outside of the jamb. The louvre end clips to not contain
any drainage channels.
USA patent 422-6051 is directed to a louvre window. The louvre
glass is fitted into an end clip which contains a reinforcing element which
forms ati enclosed void. This void does not appear to be used for drainage.
European patent application 432828 describes an end clip and
particularly a moulded end clip which has a substantially hollow interior. The
interior does not appear to be used to drain water.
USA patent 1830487 shows a louvre for windows and figure 6
appears to show a small internal void but this void does not appear to be
used to drain water.
USA patent 431-0993 describes a gutter arrangements and a
down spout arrangement but the arrangement does not form part of an end
Japanese patent application 11325529 does not appear to show
an end clip containing Internal drainage channels.
OBJECT OF THE INVENTION
It is an object of the invention to provide a louvre system
containing various improvements and which may overcome at least some of
the abovementioned disadvantages.
In one form, the invention resides in a louvre end clip, the end
clip having an outer body, a longitudinal recess formed in the outer body and
which is adapted to accommodate the edge of a louvre blade, the outer body
having at least one internal drainage chamber which allows water to drain
through the end clip when the end clip is in the closed position.
Previous end clips failed to provide internal drainage chambers
which meant that if water did penetrate between end clips, it would simply run
over the outside of the end clip and hopefully into a lower collection channel
on the bottom of the louvre window. However, this is quite unsightly and
often water drips off the end clips and lands on the floor rather than passing
down the various louvre blades and fnto the collection channel on the bottom
of the louvre window. The internal drainage chamber can be seen as a water
Suitably, the at least one drainage or collection chamber has an
open bottom and forms a closed chamber with the U-shaped channel to
which the end clip is attached when the clip is in the closed position. This
reduces the weight of the end clip and can also reduce the load placed on the
louvre operating system by not having a closed bottom wall that may
frictionally rub against the U-shaped section. However, if an entirely closed
chamber is considered desirable it will form part of the present invention.
Suitably, the at least one chamber has an at least partially open
top end and an at least partially open bottom end. Thus, when a number of
end clips are all in the closed position and in line with each other, the
chamber on each end clip can communicate with the chamber on each
adjacent end clip to form a single drainage channel to allow water to quickly
and unobtrusively drain into the collecting channel or some other form of
channel/drainage means on the lower part of the louvre frame.
Suitably, the at least one chamber extends between the
longitudinal recess which accommodate the louvre blade, and an outer edge
of the end dip.
It is preferred that the at least one chamber has a curved outer
wall and therefore may comprise a curved outer wall extending between the
longitudinal recess and the free edge of the end clip. It is preferred that the
outer wall is uniformly curved.
It is preferred that the at least one chamber has one wall which
is defined by a wall which comprises the longitudinal recess.
In use, any water which penetrates between adjacent closed
end clips will pass into the at least one chamber. In this area, there will
typically be a change of pressure and velocity conditions and this typically
results in water droplets becoming more easily separated from the air and
dropping into and along the at least one chamber to be drained away.
Suitably, the end clip is provided with more than one drainage
chamber. Thus, a second drainage chamber may be provided. The second
drainage chamber may comprise the longitudinal recess and more preferably
may comprise a gap formed between the louvre blade that is positioned within
the longitudinal recess and the bottom wall of the longitudinal recess.
If necessary, a spacing means may be provided to ensure that
the louvre blade is not pushed all the way into the longitudinal recess such
that a gap is no longer formed. The spacing means may comprise a
projection or a plurality of projections, a rib, and the like. The spacing means
may be sufficient to ensure that there is a gap of least 1-8 mm.
The end clip suitably has a third drainage chamber. The third
drainage chamber may be similar to the at least one chamber but on the
other side of the clip.
Thus, a preferred end clip can be provided with 3 drainage
chambers/zones/areas being an outer chamber (the at least one chamber) an
intermediate chamber (in the longitudinal recess), and an inner chamber (the
third drainage chamber which is on the other side of the longitudinal recess).
It is preferred that the at least one chamber and the third inner
chamber have a curved outer wall, and therefore in another form the invention
resides in an end clip for a louvre, the end dip comprising a longitudinal body,
the longitudinal body being substantially semicircular in cross-section, and
having a longitudinal recess into which a louvre blade can fit.
Another advantage with the above clip configuration is that when
the clips are all in the closed position, a substantially continuous line is
produced which provides better drainage and weatherproofing.
If desired, a shroud can be provided. The shroud may comprise
an extending lip that extends over an adjacent clip when the two clips are in
the closed position and to provide further weatherproofing. The shroud may
be formed integrally with the clip. The length of the shroud has an effect on
the weatherproofing of the clips, however if the shroud is too long, the shroud
may be damaged and manufacturing costs are increased. After much
research and experimentation it has been found that the shroud length is
dependent on the gap width between adjacent clips, and a ratio of shroud
length to gap width should be between 5-6. Thus, if the gap width is
approximately 1 mm, the shroud length should be between 5 mm 6 mm.
In order to allow a single handle to manipulate a larger than
normal number of louvre blades, and in order to avoid manufacture of
extremely heavy duty and expensive louvre operating systems, the present
invention is also directed to an arrangement where the load on the operating
system can be reduced which thereby aHows a handle to operate a larger
than normal number of louvres blades.
One form of the present invention allows this to happen by
ensuring that the clip does not frictionally engage or rub up along the U-
shaped section until just before the clip is pivoted to the fully closed position
at which time a seal is formed. Thus, once the clip has been only slightly
opened, the sealing engagement between the clip and the channel is typically
lost which means that there is much less load placed on the louvre operating
system upon further operation of the end clip.
In one form this can be achieved by providing an assembly of an
end clip, a bearing and a channel member, the end clip being pivotaliy
attached to the channel member to enable the end clip to be rotated between
a closed position where the end clip is substantially in line with the channel
member, and an open position where the end clip pivots to an angle relative
to the channel member, the bearing being attached to the end clip such that
rotation of the bearing causes the end clip to rotate, the bearing having a
portion which is positioned in the channel member, this portion being provided
with a first camming member, the channel member being provided with
camming surface, the position of the camming member and the second
camming surface being such that a seal is obtained only when the bearing
member is rotated to the louvre closed position, but when the bearing
member is rotated to a partially louvre opening position, the seal is lost.
Thus, the end clip can now be rotatably attached tn the channel
member quite loosely by which is meant that the end clip does not frictionally
rub up across the channel member for most of the time that the end clip
moves between opened in closed positions. Only when the end clip is in the
almost closed position does the cam engage to pull the end clip against the
channel member to provide a good seal. Slight opening of the end clip will
release the cam thereby allowing the end clips to again move with little
frictional load against the channel member.
It is envisaged that there will be many different types of
camming actions or pulling actions to pull the end dip against the channel
member when the end clip is in the almost closed position, and it is
considered that the invention should not be limited to just one type of cam
Thus, in a broader form of this invention there may be provided
an assembly comprising an end clip, a bearing to which the end clip is
attached, a channel member to which the bearing is attached, the bearing
being rotatable relative to the channel member, the bearing or channel
member being provided with a cam arrangement such that when the end clip
is in the almost closed position, the end clip is pulled against the channel
member to provide a seal.
The end clip can now be attached such that there is a gap
between the end clip and channel member (thereby reducing frictional
engagement), and although this in theory could allow water to more easily
pass through the end clip, as soon as the end clip is rotated to the closed
position, it is pulled against the channel member to provide a good seal
The camming device can be spring-loaded so that any tolerance
issues are negated.
For the majority of the open/close cycle, the cam is not
functioning with the results that there is negligible contact between the clip
and the channel. This minimises load on the operating mechanism. Thi3
allows a greater number of blades to be operated with the one handle. This
enables the handles to be positioned in a more economically sound position.
The cam functions to pull the end clip to the face of the channel
member. Another advantage with this is any visible light between the end clip
and channel Is eliminated This can improve the aesthetics and the
perception of weatherproofing.
It is preferred that the end clip comprises a concave bow over its
length. This is done such that the pulling down of the clip onto the channel by
the cam will result in the clip being called into contact with the channel over
the full length of the clip.
In a further form of the invention there is provided an improved
louvre operating system. This operating system requires only a single bar
(which is already known), but the bar has a particular shape and is held in a
particular manner that provide significant benefits.
Therefore, another form of the invention is directed to a louvre
operating system which comprises an elongate operating bar, the bar being
substantially L-shaped to define 2 elongate legs which are substantially at
right angles to each other, one leg being provided with a plurality of sprocket
tooth forms spaced along the leg.
With thi3 arrangement, the tooth form is can be punched into
one leg of the L section bar, with the other leg providing sufficient strength to
the bar. If the bar was simply flat, the tooth form might weaken the bar which
means that the bar might have to be formed of stronger and more expensive
Preferably, a single operating bar is used to rotate all the louvre
blades. Thus, it is no longer necessary to manufacture operating bars in
smaller links and connect the bars together that possesses a number of
disadvantages described above. Also, punching the tooth form into one leg
of the bar is a relatively simple operation to carry out and the pitching
accuracy is easy to achieve and maintain as this can be built into the tool.
The louvre operating assembly may comprise the elongate bar
as described above, and a bearing which is attached to an end clip, the
bearing being provided with a tooth profile which can engage with the tooth
form on the operating bar such that reciprocation of the operating bar will
cause rotation of the bearing. Suitably, the operating bar contains a plurality
of such forms, and may have between 2-15 tooth forms on a single operating
bar. This can engage with approximately 2-15 bearings that allow 2-15 louvre
blades to be operated by a single handle.
The handle may be connected to a link that is contained in a slot
in the handle at the joint between link and handle. This enables the rivet to be
supported (or fixed) to both sides of the slot in the handle. This minimizes any
bending forces on the rivet, increases the strength of the joint (for components
of the same size made from the same material); and eliminates any flexing of
the joint under locking pressure as there is no component of the force at the
joint acting perpendicular to acting / reacting forces at the handle / link joint.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Embodiments of the invention will be described with reference to the following
drawings in which:
Figure 1. Illustrates a section view of a louvre blade fitted within an end clip that
is in the closed position on the channel member.
Figure 2. Illustrates an internal side view of a pair of louvre clips in the closed
position, each clip having a louvre blade fitted.
Figure 3. Illustrates the cam arrangement where the end clip is pulled against
the channel member by a cam.
Figure 4. Illustrates the cam arrangement of figure 3 but now in the free
Figure 5. Illustrates a shroud.
Figure 6. Illustrates in section an L-shaped operating member that forms part of
the louver operating assembly fitted inside the channel member.
Figure 7. Illustrates in plan view a sprocket tooth form punched into one leg of
the L-shaped operating member and engaging with teeth on the
Figure 8. Illustrates a side view of a pair of end clips attached to the channel
member and in the closed position, each end clop having a louver
Figure 9. Illustrates the end dips of figure 8 from the inside.
Figure 10. Illustrates a bearing from one end.
Figure 11. Illustrates the bearing of Figure 10 from the other end.
Figure 12. Illustrates the louvre operating assembly containing the L-shaped
operating bar in the closed position.
Figure 13. Illustrates the louvre operating assembly of Figure 12 in the
Figure 14. Illustrates a section view of the bearing containing a fitted end plate
and attached to an end clip and positioned within the channel member.
Figure 15. Illustrates a slotted handle in the closed position.
Figure 16. Illustrates the slotted handle in the open position.
Figures 17A-17D. Illustrate various views of the slotted handle.
Referring to the accompanied drawings and particularly to Figure 1, the louvre
window system having a louvre end clip 10 which is generally semicircular in
configuration and contains a longitudinal recess 11 formed in the body and which
is adapted to accommodate the edge of a louvre blade 12.
End clip 10 is positioned on a channel member and has a unique curved
configuration and contains at least one drainage chamber 14. Drainage chamber
14 is defined by one sidewall 15 of recess 11, and the curved outer wall 16 of
end clip 10. The end clip has an open bottom 17, but when the end clip is in the
closed position illustrated in figure 1, the outer wall 18 closes chamber 14. Of
course, when the end clip is pivoted to the open position, chamber 14 is now
open at the bottom 17.
Chamber 14 extends along the length of louvre clip 10, and this is better
illustrated in figures 8 and 9. Chamber 14 has two end faces 19, 20(only end
face 19 being illustrated in figure 8). Each end face is formed with an opening 20
to allow water to pass into and down chamber 14.
Testing reveals that one of the main areas where water penetrates the system is
at the intersection between adjacent clips. Because the louvre system functions
by adjacent overlapping blades a gap is formed between adjacent end clips.
Normal manufacturing tolerances makes it virtually impossible to eliminate the
gap. Under a situation where there is a pressure differential between the inside
and the outside of a lourve window, air infiltrates and water tracks through the
gap between overlapping clips and enters the inside of the system.
With the clip design that forms part of the present invention, any.........................
air/water mixture that passes between the clips initially contacts the upper
end of chamber 14, which has opening 20. The physical geometry in this
area is that the "air gap" greatly increases between the narrower gap between
the clips and the quite large opening into chamber 14. This increase in
volume reduces the velocity and the pressure of the air/water. The result is
what can be seen as a reducing vortex that "dumps" water from the air
stream, the water then passing or dropping into chamber 14.
The end clip of the embodiment has a second drainage
chamber 21. The second drainage chamber can be seen as an intermediate
drainage chamber and is defined by the lowermost portion 21 of recess 11,
this being best illustrated in figure 1. This lowermost portion exists between
the bottom of blade 12 and the bottom wall of recess 11. Although this
chamber is not as large as chamber 14, it nevertheless does function to drain
water. To prevent blade 12 from being pushed up against the bottom wall of
recess 11, a small spacing member 22 is provided to ensure that chamber 21
The end clip finally has a third chamber 23. Third chamber 23 in
the embodiment is identical in size and configuration to chamber 14 except
that it extends on the other side of blade 11. Chamber 23 is defined by one
sidewall 24 of recess 11 and curved outer wall 25 of end clip 10. The third
chamber 23 functions as a backup to drain any water that may pass over
chamber 14 and chamber 21.
Thus, end clip 10 in the embodiment has 3 drainage chambers
providing an extremely effective drainage of water passing between the clips.
The shape of the end clip is such that when a number of end
clips are in the closed position (see figure 8 illustrating 2 end clips in the
closed position) the outside curved side wall is virtually a single continuous
curved side wall which provides improved drainage and improved aesthetic
appeal and allows for easier cleaning.
Figure 2 illustrates the gap 26 between two adjacent end clips
and through which air/water can pass.
Figures 3 and 4 illustrate another part of the invention that is the
cam arrangement. Previously, In order to ensure that end clip 10 was
properly sealed against channel member 13 when in the closed position, it
was necessary for the inner wall of the end clip to have some form of
longitudinal sealing rib which pressed against outer wall 18 of channel
member 13. However, this increased the force required to operate each end
clip and placed a limitation on the number of louvres which could be operated
by a single operating mechanism and by a single handle.
In the present invention, the end clips 10 are rotated by a
bearing. 27, bearing 27 being illustrated in figures 3, 4 and 6 and being best
illustrated in figures 10 and 11 which shows the bearing by itself.
Bearing 27 has an outer wall 28 (see figure 11) fitted with a pair
of opposed extending fingers 29. Fingers 29 extend to each side and grip the
outer walls of recess 11 on end clip 10. This is best illustrated in figures 3
and 4. Thus, rotation of bearing 27 causes rotation of the attached end clip.
An opening (not illustrated) is provided in channel member 13 to allow the
outer wall 28 and the fingers 29 of bearing 27 to project through the channel
member and to engage with the outer walls of recess 11. It can also be seen
from figure 3 that the fingers are positioned inside chambers 14 and 23.
Bearing 27 has an inner portion 30 which is positioned inside
channel member 13 as illustrated in figure 3. The inner portion is provided
with a camming portion 31 that comprises a resilient strip.
The inner wall of channel member 13 is provided with a
camming surface 32.
The camming arrangement is such that when end clip 10 is in
the closed position illustrated in figure 3, camming portion 31 is against
camming surface 32 which functions to pull bearing 27 slightly into channel
member 13 by a distance of between 1-3 mm. As bearing 27 is attached to
end clip 10, end clip is also pulled against the outer wall 18 of channel
member 13. Thus, when in the closed position, end clip 10 seals against the
outer wall of channel member 13.
However, when the clip is slightly rotated by only a few degrees,
camming portion 31 is rotated away from camming surface "32 (this being best
illustrated in figure 4) that again allows the end clip to now not be pulled up
against channel member 13.
Referring to figure 5 there is illustrated a shroud according to an
embodiment of the invention. Shroud 35 covers the gap between adjacent
clips. After much research and experimentation if has now been found that
the efficiency of the shroud is maximised if the ratio between the gap width
and the shroud length is between 5-6. Thus, if gap 36 is approximately 1 mm,
the length of the shroud should be~belween 5 mm and 6 mm.
"Figures 6, 7, 12 and 13 illustrate parts of a louvre operating
assembly according to an embodiment of the invention. The louvre operating
assembly comprises a single L-shaped operating bar 37. The L-shaped
operating bar means that the bar has two leg portions 38, 39 that are
substantially at right angles to each other. The leg portion 39 is best
illustrated in figures 12 and 13 while the other leg portion 38 Is best illustrated
in figure 6. A sprocket tooth form 40 can be punched into leg portion 39 in a
relatively simple operation. The pitching accuracy is easy to achieve and
maintain as this is built into the punching tool. The other leg portion 38 is not
punched, and provides strength to the operating bar.
Bearing 27 is a moulding and has matching tooth 41 moulded
into the form.
Bearing 27 has a snap on cap 42 (see figure 6 and figure 14).
The snap on cap traps leg member 39 between bearing 27 and the snap on
cap 42. This is best illustrated in figure 6. Other leg member 38 is guided by
the sidewall of channel member 13. This arrangement means that the forces
between the operating bar and bearing 27 are shear forces, which maximises
the strength of the components in the system.
The mechanism is also easier to assemble as the components
are put together one on top of the other and in sequence. The sequence and
case of assembly lends itself to the development of an automatic assembly
The camming surface 32 in the embodiment comprises a centre
rib. The centre rib also gives extra strength to the channel. In some
installations the louvre assembly is screwed into the window frame through
the centre of the channel. This has the tendency to deform the channel in the
area where the screw is positioned with the result that the system fails the
water penetration resistance requirements because of the gap caused by the
defamation of the channel. The extra strength given by the rib assists in
eliminating this problem.
Referring to figures 15-17 there is illustrated a particular slotted
handle design to form part of the louvre operating mechanism. As illustrated
in these particular figures, the louvre operating mechanism comprises a pair
of slide members 50, 51. Each slide member is provided with a tooth profile
.52 which engages with a gear 53. Gear 53 is part of the end clip 54 of a
louvre. The slide members 50, 51 are operated by pulling handle 55 either up
or down. In figure 15, handle 55 is in the up position and the louvres are
closed, while in figure 16 handle 55 is in the down position and the louvres
Handle 55 is pivotly mounted (typically via a rivet 56) to one of
the slide members. Handle 55 is mounted to the other slide member via a
link member 57 which is pivotly connected to the other slide member and to
the handle 55. Link member 57 is pivotly connected to the handle via a pin
58. Referring now to figures 17A-D, there is illustrated that handle 55 has a
slot 60 and link member 57 can pivot partially into and out of slot 60. This
enables pin 58 to be supported or fixed to both sides of the slot in the handle.
This minimises any bending forces on the pin and increases the strength of
this particular joint. There is reduced or no flexing of the joint under locking
pressure as there is no component of the force at the joint which acts
perpendicular to acting/reacting forces at the handle/link joint.
It should be appreciated that various changes and modifications
may be made to the embodiment described without departing from the spirit
and scope of the invention.
1. A louvre window system comprising a louvre end clip , the end clip
 having a body, a longitudinal recess  formed in the body and
which is adapted to accommodate the edge of a louvre blade , the
body having at least one internal drainage chamber  which allows
water to drain through the end clip  when the end clip  is in the
closed position wherein when a plurality of end clips  are provided in
the closed position, the drainage chamber  on each end clip 
communicate to form a common drainage channel and wherein the at
least one chamber  extends between the longitudinal recess 
which accommodates the louvre blade , and an outer edge of the end
2. A louvre end clip  of claim 1, wherein the chamber  has an at
least partially open top end and an at least partially open bottom end.
3. A louvre end clip  of either claim 1 or claim 2, wherein the at least
one chamber  has a curved outer wall [16, 25].
4. A louvre end clip  of claim 3, wherein a second drainage chamber is
5. A louvre end clip  of claim 4, wherein the longitudinal recess 11 has a
bottom wall, and the louvre blade  extends only partially into the
longitudinal recess  to define the second chamber  between the
bottom wall and the louvre blade .
6. A louvre end clip  of claim 5, comprising a spacing means 
extending from the bottom wall to prevent the louvre blade  from
passing entirely into the longitudinal recess .
7. A louvre end clip  of claim 4, wherein a third drainage chamber is
8. A louvre end clip  of claim 7, wherein the clip  comprises a portion
which is on the weather side of a louvre window assembly to which the
clip  is attached, and comprises a portion which is on the inside of the
louvre window assembly to which the clip  is attached, the third
chamber being on the inside portion of the clip , and the first drainage
portion being on the weather side of the clip .
9. A louvre end clip  of claim 1, which comprises a portion which is on
the weather side of a louvre window assembly and to which the clip 
is attached, and a portion which is on the inside of the louvre window
assembly to which the clip  is attached, the at least one internal
drainage chamber  being on the outside portion, the clip  having a
third drainage chamber  which is on the inside portion of the clip ,
and a second drainage chamber  which is in the longitudinal recess
, the weather side portion of the clip  being curved and the inside
portion of the clip  being curved.
10. A louvre end clip  of claim 1, in association with a support member
 to form a louvre clip  assembly, the at least one internal drainage
chamber  having an open bottom wall, the support member 
having a top wall , the top wall  closing the open bottom wall of
the internal drainage chamber  when the clip  is in the closed
11. A louvre end clip  of claim 10, wherein the support member 
supports a plurality of spaced apart said louvre clips , each clip 
being movable between an open position and a closed position, the clip
 being in alignment with each other when in the closed position, the
internal drainage channel [14, 23] of an upper said clip  able to drain
water into the internal drainage channel [14, 23] of a lower said clip .
12. A louvre end clip  of claim 1, pivotally attached to a support member
 to pivot the clip  between a closed position where the clip  is
substantially in line with the member , and an open position where
the end clip  pivots to an angle relative to the member , and a
bearing  which is attached to the end clip  such that rotation of
the bearing  causes the end clip  to pivot, the bearing  having
a portion which is positioned in the support member , the portion
being provided with a first camming member , the support member
being provided with a camming surface , the position of the camming
member  and the camming
surface  being such that a seal is obtained only when the bearing member
 is rotated to the louvre closed position, but when the bearing member 
is rotated to a partially louvre opening position, the seal is lost.
13. A loure end clip  of claim 1, in association with a louvre operating
system, the louvre operating system comprising an elongate operating bar
, the bar being substantially L-shaped to define 2 elongate legs which
are substantially at right angles to each other, one leg being provided with
a plurality of sprocket tooth forms  spaced along the leg.
14. A louvre end clip  of claim 13, further comprising a bearing 
which is attached to an end clip , the bearing being provided with a
tooth profile  which engages with the tooth form  on the
operating bar  such that reciprocation of the operating bar 
causes rotation of the bearing .
15. A louvre end clip  of claim 13, wherein between 2-15 tooth forms 40
are provided on a single operating bar .
16. A louvre end clip  of claim 13, including a handle  which operates
the operating bar , the handle  being connected via a joint to a
link  that is contained in a slot  in the handle  at the joint
between the link  and handle .
A louvre window system has an end clip (10) which is founded with at lest one
internal drainage channel (14) which can drain water through the end clip (10).
A number of such can rotate between an open position and a closed position.
The clips (10) are aligned when in the closed position which means that water
can drain from an up-per clip through a lower clip. The clips (10) have a low
friction design which means that a larger number of louvres can be rotated by
single handle without placing too much load on the handle and on the louvre
operating mechanism. A simple efficient louvre operating mechanism is used to
operate the end clips.
|Indian Patent Application Number||00909/KOLNP/2004|
|PG Journal Number||14/2008|
|Date of Filing||29-Jun-2004|
|Name of Patentee||BREEZWAY AUSTRALIA PTY LTD.|
|Applicant Address||35, CAMBRIDGE STREET COORPAROO QUEENSLAND 4151 USTRALIA|
|PCT International Classification Number||E06B7/14|
|PCT International Application Number||PCT/AU02/01588|
|PCT International Filing date||2002-11-25|