Title of Invention

A WITHDRAWABLE UNIT FOR A SWITCHGEAR ASSEMBLY

Abstract A withdrawable unit (1) for a switchgear assembly having auxiliary disconnection contacts (8) which can be closed or opened by means of an actuating device (16; 19) which is accessible from a front control panel (3) and is disposed on the withdrawable unit (1), with a contact unit (14) which is associated with the auxiliary disconnection contacts (8) being guided by means of a slide (15; 30; 42) on the withdrawable unit (1) such that it can move. The actuating device (16; 19) has a shaft (34; 42) which is mounted in the withdrawable unit (1) such that it can rotate and can be operated by means of a tool (28; 73) and in that a slotted-link means (31; 43) is fitted to the slide (15; 30; 42) and interacts with a control pin (36; 45) which projects radially from the shaft (34; 44).
Full Text Description
Switching device withdrawable part for a switchgear
assembly having auxiliary disconnection contacts
The invention relates to a switching device
withdrawable part for a switchgear assembly having
auxiliary disconnection contacts which can be closed or
opened by means of an operating apparatus which is
accessible from a front control panel and is arranged
on the switching device withdrawable part, with a
contact unit which is associated with the auxiliary
disconnection contacts being guided by means of a slide
on the switching device withdrawable part such that it
can move.
A switching device withdrawable part of this type has
been disclosed, for example, in DE 199 48 697 Al. In
this case, the contact unit is arranged on the rear
face of the switching device withdrawable part, and can
be operated by means of a grip (knob or the like) which
is provided on the front control panel of the switching
device withdrawable part. The grip is fitted to the
slide, which is intended for use as means for guiding
the contact unit such that it can be moved in a
straight line. The grip therefore assumes a position
which projects relative to the front control panel when
the auxiliary disconnection contacts are not engaged.
For main disconnection contacts, it is already known in
the case of a switching device withdrawable part
according to DE 27 17 691 Al for a worm drive to be
used, which can be operated by a tool on the front
control panel of the switching device withdrawable
part. In this case, a worm moves a slide, which is
fitted with contact units of the main disconnection
contacts, close to the rear face of the switching
device withdrawable part has auxiliary disconnection
contacts which, however, are positively engaged with
one another during insertion of the switching device
withdrawable part into an associated switchgear
assembly. These auxiliary disconnection contacts do not
become effective, however, until the worm drive of the
main disconnection contacts is operated, since an
auxiliary switch is coupled to the worm drive and
enables the auxiliary voltage for operation of the
contactors etc.
A further switching device withdrawable part is
described in the prior patent application
DE 101 20 737.9 dated April 20, 2001, with the note
that auxiliary disconnection contacts can be operated
by a worm drive or screw drive similar to that in
DE 27 17 691 Al.
The invention is based on the object of improving the
operation of auxiliary disconnection contacts in
switching device withdrawable parts, and for this
purpose provides that the operating apparatus has a
shaft which is mounted in the switching device
withdrawable part such that it can rotate and can be
operated by means of a tool, and in that a slotted-link
arrangement is fitted to the slide and interacts with a
control pin which projects radially from the shaft.
The operating apparatus according to the invention can
be produced and installed more easily, with the same
advantageous function as that in the case of the worm
arrangement according to DE 27 17 691 Al. In
particular, this allows a slotted-link arrangement to
be associated with the slide of the contact unit, with
both parts (slide and slotted-link arrangement) being
in the form of an integral sheet-metal part. However,
if there is a need for a greater force to be
transmitted, as may be desirable, for example, in the
case of multipole auxiliary disconnection contacts,
then, according to one refinement of the invention, an
appropriate movement sequence can be achieved in that
the slotted-link arrangement has a worm gear with at
least two sections with different pitches, of which one
section has an increased force step-up ratio, which is
suitable for closing the auxiliary disconnection
contacts with respect to rotation of the shaft. The
other section is in this case expediently of such a
size that the idling movement of the contact unit from
its rest position until the contacts first touch the
stationary part of the auxiliary disconnection contacts
takes place over a relatively short rotation angle of
the shaft.
A slotted-link arrangement having this characteristic
can advantageously be designed such that two
slotted-link bodies are provided, which are firmly
connected to the slide, are hollow and cylindrical and
are arranged coaxially with respect to the shaft, and
whose mutually facing end surfaces bound a worm gear
which holds the control pin. The separate slotted-link
bodies can be produced considerably more easily than an
integral worm body and make it possible to produce the
desired relationship between the operating travel or
rotation angle of the force to be applied, with little
effort.
A further useful modification, which can be implemented
easily owing to the axially split slotted-link
arrangement, may comprise the worm gear having a
section with the opposite pitch at at least one end,
and a spring which axially prestresses the slotted-link
arrangement producing a latch for the shaft in one end
position.
As already mentioned in the introduction, the essence
of the invention includes a simple production
capability and easy installation of the auxiliary
disconnection contact arrangement. This can be
contributed to by the slotted-link bodies each having a
radially projecting flange, and the slide having a
supporting limb which can be connected to the flanges.
The dimensions of the supporting limb and of the
flanges in this case at the same time ensure the
necessary distance between the slotted-link bodies for
the control pin to engage in. The flanges and the
supporting limb are in this case expediently arranged
parallel to one another and are connected by means of
continuous attachment means such that they are aligned
and cannot rotate.
As is known per se, the shaft may be provided at the
end with a contour which is suitable for connection to
a tool. In this case, both removable tools in the form
of a known hand crank and tools such as a rotary knob
which are permanently connected to the shaft are
suitable for operating the shaft.
The invention will be explained in more detail in the
following text with reference to the ,exemplary
embodiment which is illustrated in the figures.
Figure 1 shows a plan view of a switching device
withdrawable part for a low-voltage switchgear assembly
having an operating apparatus for auxiliary
disconnection contacts.
Figure 2 shows, as a first example of an operating
apparatus, a slide having a slotted-link arrangement
fitted to it, in conjunction with a shaft which is
intended for operating the slide.
Figure 3 shows a further example of an operating
apparatus for the auxiliary disconnection contacts in
the assembled state, together with a slide as a mount
for a moveable contact unit for the auxiliary
disconnection contacts.
Figure 4 shows the major components of the operating
apparatus as shown in Figure 3, in the form of a
perspective, exploded illustration.
Figure 5 shows a perspective illustration of the
right-hand front corner of the switching device
withdrawable part shown in Figure 1, with the operating
apparatus for the auxiliary disconnection contacts as
shown in Figures 3 and 4 being located in the
"auxiliary disconnection contacts open" position.
Figure 6 shows an illustration corresponding to that in
Figure 5, with the operating apparatus being located in
the "auxiliary disconnection contacts closed" position.
A switching device withdrawable part 1, a plan view of
which is shown in Figure 1, for a low-voltage
switchgear assembly has a frame or housing 2, on whose
front face a front control panel 3 with handles 4 and 5
is located, and on whose rear face main disconnection
contacts 6 and 7 as well as auxiliary disconnection
contacts 8 are located. In this case, the main
disconnection contacts 6 are used for feeding power,
while the main disconnection contacts 7 represent a
load outgoer. The main disconnection contacts 6 and 7
are engaged in a known manner with fixed-position
vertical busbars and opposing contacts 10 and 11 by
movement of the switching device withdrawable part 1 in
the direction of an arrow 12, and are disconnected from
them by movement in the direction of an arrow 13. The
auxiliary disconnection contacts 8 have an associated
contact unit 14, which is attached to the rear end of a
slide 15 which is guided such that it can move in a
straight line in the frame 2. The slide 15 can likewise
be moved in the direction of the arrows 12 and 13 by
respective operating apparatuses 16 and 19, which will
be explained in more detail later.
The switching device withdrawable part 1 furthermore
has a mounting plate 17, which is arranged parallel to
the front control panel 3, for switching, control and
protection devices. Of these, only one main switch 18
is indicated, which can be operated by means of a
rotary handle 20 located on the front control panel 3.
Furthermore, the switching device withdrawable part 1
has a locking bar 21 which extends essentially over the
entire width of the frame 2, is mounted by means of
pivoting arms 22 and 23 in side walls of the frame 2
such that it can pivot, and has locking tabs 24 and 25
which project beyond the frame 2 and interact with
fixed-position slotted links, which are not shown.
These are used in a known manner to secure the
switching device withdrawable part 1 in particular in
the "disconnected" and "connected" positions, and at
the same time to ensure the necessary interlocks with
respect to the main switch 18 and, if appropriate, with
respect to a drive operator. A threaded spindle 26 with
an associated hand crank 27 which can be fitted as
required as components of such a drive operator are
likewise shown in Figure 1. A tool 28, which may be in
a similar form to the hand crank 27 or may be a key, is
indicated as means for operating the operating
apparatuses 16 and 19.
A first exemplary embodiment of an operating apparatus
for the auxiliary disconnection contacts 8 will be
explained first of all with reference to the figure.
Figure 2 shows a schematic perspective illustration
without the guide and bearing parts of the housing 2
(Figure 2) . A slide 30 is shown broken off, and is
provided with a slotted-link arrangement 31. This has a
slotted-link body 32, which is in the form of a
sheet-metal part and has a worm gear 33. In this case,
the slotted-link body 32 together with the slide 30 can
form an integral stamped part into which, when it is
still flat, the worm gear 32 is incorporated as a slot
by stamping. The slotted-link body 32 is then shaped by
bending to the illustrated open or closed cylindrical
shape, which is matched to a shaft 34. The same
advantage of the capability for simple production of
the worm gear 33 is achieved if the slotted-link body
32 is produced as a separate part and is connected to
the slide 30 in some suitable manner. In this case, the
shaping to form the illustrated hollow cylindrical form
may be carried out either before or after the
connection to the slide 30.
Figure 2 illustrates the shaft 34 at a distance from
the slotted-link arrangement 31, in order to conceal
the slotted-link body 32 to a lesser extent. A
dashed-dotted line 35 indicates that a control pin 36,
which is seated in the shaft 34 and projects radially,
is provided for engaging in the worm gear 33. In its
installed position, the shaft is mounted such that it
can rotate (for example in the front control panel 3 in
Figure 1) and is supported against axial movement. At
the end, the shaft 34 is provided with a contour 37,
which is' illustrated as a quadrilateral attachment. A
tool which matches the contour 37 (see the tool 28 in
Figure 1) allows the shaft 34 to be rotated as
indicated by the arrow 38, thus moving the slide 30 as
indicated by an arrow 39.
Figure 2 indicates that the worm gear 33 has two
sections 40 and 41, which have different pitches. This
configuration means that the slide 30 travels through
different distances for the same rotation angle of the
shaft 34, when the control pin 36 is located in the
section 40 or in the section 41. While the auxiliary
disconnection contacts 8 are being closed, this results
in a fast feed movement until the contacts touch, after
which a relatively small operating force is required on
the tool for the shaft 34, despite the greater amount
of force required for engagement of the contact
elements.
A further exemplary embodiment of an operating
apparatus 19 will be explained in the following text
with reference to Figures 3 and 4. In this case, the
operating apparatus 19 is illustrated in the installed
state in Figure 3, and in perspective, in the broken
down state, in Figure 4.
In a similar way to Figure 2, Figure 3 shows a slide 42
which is provided with a slotted-link arrangement 43.
This surrounds a shaft 44, which engages by means of a
control pin 4 5 in a worm gear 46. At the end, the shaft
44 is provided with a shutter collar 47, which has a
viewing window 48 for inscriptions on the front control
panel (3 in Figure 1) as well as an opening for access
to a contour 49 of the shaft 44.
As is shown in Figure 4, the slotted-link arrangement
43 comprises two slotted-link bodies 50 and 51, whose
mutually facing end faces 52 and 53, respectively, form
the worm gear 46. The separation which is required for
this purpose is achieved by flanges 54 and 55, which
project radially from the slotted-link bodies 50 and 51
and are provided with through-holes 56 for connection
and attachment. In order to allow simple installation
without adjustment, the flange 55 is provided with two
prismatic pins which project in the direction of the
flange 54, and which are held in recesses 58 in the
flange 54. A recess 59 is arranged in that end surface
of the slotted-link body 51 which forms one wall of the
worm gear 46, and the control pin 45 (Figure 3), which
is concealed in Figure 4, can enter this recess 59
under the influence of an axially acting spring 60. The
arrangement results in a latch at the end of the worm
gear 46. An identical depression can be arranged in the
same sense at the opposite end of the worm gear
(concealed in Figure 4).
The slide 42 is provided with a supporting limb 61 in
order to connect the slotted-link arrangement 43 to the
slide 42. The shutter collar 47 is provided with a
tubular attachment 62, which is matched to a
cylindrical step 63 on the shaft 44 and can be
connected to it by means of a pin 64. The slide 42
(Figure 3) is provided at its rear end with an angled
mounting limb 65 for holding the contact unit 14.
The operating apparatus which has been explained with
reference to Figures 3 and 4 is shown in the installed
state in Figures 5 and 6, together with the front
right-hand corner of the switching device withdrawable
part 1 as shown in Figure 1.
In addition to the parts which have already been
explained with reference to Figure 1, in particular the
front control panel 3 and the locking bar 21, Figures 5
and 6 show a side wall 66 with a through-window 67 for
the latching tab 25 as well as an auxiliary switch 68,
which is fitted to the supporting limb 61 of the slide
42. In this case, in Figure 5, the operating apparatus
is located in the position with the auxiliary
disconnection contacts open. This can be seen from the
fact that the slotted-link arrangement 43 has been
moved right to the front, and the auxiliary switch 68
with its switching arm 69 is resting on the inner face
of the front control panel 3, or on a separate stop.
The viewing window 48 in the shutter collar 47 is
positioned on the right-hand side above an appropriate
inscription on the front control panel 3.
If the shaft 44 is rotated through approximately 270°
to the right, this results in the slotted-link
arrangement being moved with the slide 42 to the rear,
in order to engage the contact unit 14 (Figure 1) with
the fixed-position contact unit 70. The switching arm
69 of the auxiliary switch 68 is in the process moved
away from its stop, and signals the changed switch
position.
Both figures 5 and 6 show two sections 71 and 72 of the
worm gear with different pitches. During closure of the
auxiliary disconnection contacts, the process first of
all passes through the section 71 with the coarser
pitch. In the process, the idling travel is passed
through, in order to allow the moveable contact unit to
approach the fixed-position contact unit 70 from the
disconnected position. The second section 72 of the
worm gear 46 has a finer pitch and, in consequence,
produces less movement of the slotted-link arrangement
for the same rotation of the shaft 44, which
corresponds to a greater amount of force being exerted.
The contact elements of the contact units 14 and 70 are
engaged with one another along the section 72.
The slotted-link bodies 50 and 51 can expediently be
produced in the form of moldings composed of metal or
plastic using die-casting or injection-molding methods,
respectively. In this case, the surfaces which are
produced once the worm gear 43 has been joined together
are formed with all the required features by means of
the walls of the die-casting or injection-molding mold,
and are thus produced without any subsequent machining
of the die-cast or injection-molded parts.
A known hand crank 28 (Figure 1) has already been
mentioned as a tool for operating the shaft (34 in
Figure 2, 44 in Figures 3 to 6) . When required, this
hand crank can be fitted to the described contour on
the end face of the shaft (31 in Figure 2, 49 in
Figure 3) , and for this purpose has an appropriately-
shaped mating piece. However, if the switching device
withdrawable part needs to be operated frequently, it
may be advantageous for it to be possible to operate
the auxiliary disconnection contacts directly. This can
be achieved by using a tool 73 in the form of a rotary
knob instead of the hand crank, as is shown in
Figure 1. In this case, this rotary knob can be
connected to the shaft of the operating apparatus by a
suitable contour, in the same way. If removal is not
envisaged or is undesirable, the rotary knob can be
secured by suitable means such as a splint, splined pin
or the like.
WE CLAIM
1. A withdrawable unit (1) for a switchgear assembly having auxiliary
disconnection contacts (8) which can be closed or opened by means of an
actuating device (16; 19) which is accessible from a front control panel (3)
and is disposed on the withdrawable unit (1), with a contact unit (14)
which is associated with the auxiliary disconnection contacts (8) being
guided by means of a slide (15; 30; 42) on the withdrawable unit (1)
such that it can move,
characterized in that
the actuating device (16; 19) has a shaft (34; 42) which is mounted in the
withdrawable unit (1) such that it can rotate and can be operated by
means of a tool (28; 73) and in that a slotted-link means (31; 43) is fitted
to the slide (15; 30; 42) and interacts with a control pin (36; 45) which
projects radially from the shaft (34; 44).
2. The withdrawable unit as claimed in claim 1, wherein the slotted-link
means (31; 43) has a worm gear (40; 46) with at least two sections (40,
41; 71, 72) having different pitches, of which one section (40; 72) has an
increased force stepOup ratio, which is suitable for closing the auxiliary
disconnection contacts (8) with respect to rotation of the shaft (34; 44).
3. The withdrawable unit as claimed in claim 1 or 2, wherein the slottedOlink
means (43) is formed by two slotted-link bodies (50; 51), which are firmly
connected to the slide (42), are hollow and cylindrical and are arranged
coaxially with respect to the shaft (44), and whose mutually facing
surfaces (52; 53) bound a worm gear (46) which holds the control pin
(45).
4. The withdrawable unit as claimed in claim 2 or 3, wherein the worm gear
(46) has a section (59) with an opposite pitch at atleast one end, and
wherein a spring (60) which axially prestresses the slotted-link means
(43) produces a latch for the shaft (44) in one end position.
5. The withdrawable unit as claimed in claim 2 to 4, wherein the slotted-link
bodies (50, 51) each has a radially projecting flange (54, 55), and
wherein the slide (42) has a supporting limb (61) which can connected to
the flanges (54, 55).
6. The withdrawable unit as claimed in claim 5, wherein the flanges (54, 55)
on the slotted-link bodies (50, 51) and the supporting limb (61) on the
slide (42) are arranged parallel to one another and are connected by
means of continuous attachment means such that they are aligned and
cannot rotate.
7. The withdrawable unit as claimed in one of the preceding claims, wherein
the shaft (34; 44) is provided at the end with a contour (37; 49) for
connection to a tool (32).
8. The withdrawable unit as claimed in one of the preceding claims, wherein
the tool (73) is in the form of a rotary knob which is permanently
connected to the shaft (34; 44).

A withdrawable unit (1) for a switchgear assembly having auxiliary disconnection
contacts (8) which can be closed or opened by means of an actuating device
(16; 19) which is accessible from a front control panel (3) and is disposed on the
withdrawable unit (1), with a contact unit (14) which is associated with the
auxiliary disconnection contacts (8) being guided by means of a slide (15; 30;
42) on the withdrawable unit (1) such that it can move. The actuating device
(16; 19) has a shaft (34; 42) which is mounted in the withdrawable unit (1) such
that it can rotate and can be operated by means of a tool (28; 73) and in that a
slotted-link means (31; 43) is fitted to the slide (15; 30; 42) and interacts with a
control pin (36; 45) which projects radially from the shaft (34; 44).

Documents:

966-kolnp-2004-abstract.pdf

966-kolnp-2004-claims.pdf

966-kolnp-2004-correspondence.pdf

966-kolnp-2004-description (complete).pdf

966-kolnp-2004-drawings.pdf

966-kolnp-2004-examination report.pdf

966-kolnp-2004-form 1.pdf

966-kolnp-2004-form 18.pdf

966-kolnp-2004-form 2.pdf

966-kolnp-2004-form 3.pdf

966-kolnp-2004-form 5.pdf

966-kolnp-2004-gpa.pdf

966-kolnp-2004-granted-abstract.pdf

966-kolnp-2004-granted-claims.pdf

966-kolnp-2004-granted-correspondence.pdf

966-kolnp-2004-granted-description (complete).pdf

966-kolnp-2004-granted-drawings.pdf

966-kolnp-2004-granted-examination report.pdf

966-kolnp-2004-granted-form 1.pdf

966-kolnp-2004-granted-form 18.pdf

966-kolnp-2004-granted-form 2.pdf

966-kolnp-2004-granted-form 3.pdf

966-kolnp-2004-granted-form 5.pdf

966-kolnp-2004-granted-gpa.pdf

966-kolnp-2004-granted-reply to examination report.pdf

966-kolnp-2004-granted-specification.pdf

966-kolnp-2004-granted-translated copy of priority document.pdf

966-kolnp-2004-reply to examination report.pdf

966-kolnp-2004-specification.pdf

966-kolnp-2004-translated copy of priority document.pdf


Patent Number 236056
Indian Patent Application Number 966/KOLNP/2004
PG Journal Number 38/2009
Publication Date 18-Sep-2009
Grant Date 17-Sep-2009
Date of Filing 09-Jul-2004
Name of Patentee SIEMENS AKTIENGESELLSCHAFT
Applicant Address WITTELSBACHERPLATZ 2, 80333 MUNCHEN
Inventors:
# Inventor's Name Inventor's Address
1 KULACOGLU, NESAT ESENTEPE MAH, MURAT SK. 18, 81430 KARTAL/ISTANBUL
2 SCHMIDT, MARIO GARTENGRUND 34, 04178 LEIPZIG
3 ZICKMANTEL, MATHIAS GUNDERMANNSTR. 7/0303, 04329, LEIPZIG
PCT International Classification Number H02B 11/127
PCT International Application Number PCT/DE2003/00194
PCT International Filing date 2003-01-22
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 10204226.8 2002-01-30 Germany