Title of Invention

"A TRAILABLE/NON-TRAILABLE CLAMP POINT LOCK FOR RAILWAY TRACK"

Abstract This invention relates to a trailable/non-trailable clamp point lock for railway track comprising a right hand and left hand side stock rail brackets secured at the foot of the stock rails by a hook bolt, right hand and left hand tongue rail brackets being secured with the respective tongue rails by a special head bolt, locking cranks are pivoted with said tongue rail bracket to move up and down to lock and unlock said tongue rails with the foot of said stock rails, the locking bark assembly passing through said tongue rail brackets are supported vertically to operate the locking cranks for main line setting/turnout setting of running trains, a drive rod connected to the lug of locking bar assembly is connected to the electric point machine having a throw/stroke of 140-260 mm; characterized in that, said locking cranks comprises an arm having bore at its fulcrum at one end thereof, locking face and operating face are provided at the other end of said crank to lock the tongue rail and provide movement to the locking bar assembly, said stock rail and tongue rail brackets are provided to operate the locking cranks into a vertical position, for trailable clamp point lock with 95 mm to 160 mm opening at toe and non-trailable clamp point lock with 95 mm to 115 mm opening at toe and operated with electric point machine having a throw of 220 mm to 260 mm.
Full Text This invention relates to Trailable/non-
trailable clamp point lock. Specifically this invention relates to a trailable clamp point lock B.G. 52/60 kg.
for thick wet switches, IRS switches and thick web switches from cranes rails having 95mm to 160mm opening
at toe and is adapted to be operated by an electric point machine having throw of 143mm to 260mm and alno
for non-trailable clamp point lock having 95mm to 115mm opening at. toe and adapted to be operated by an electric
point machine having throw of 220mm to 260mm for
turnouts on Indian Railways.
At the stations trains pass along the
straight line of the turnout and stopping ones takes the branch line/loop line of it before coming to a halt.
The speed of the passing train is not restricted but that of the stopping train is restricted to 19 km/hr.
The facing points are provided when the trains are to be diverted from main line to branch line/1oop line.
'CORRECT SETTING' and 'CORRECT LOCKING' of all facing points on a route is a mandatory requirement. The
points can be operated mechanically or electrically.
For CORRECT SETTING end CORRECT LOCKING of facing points it. is required to provide point machines with direct, locking of switches with the help of clamp point lock.
The clamp point lock is known in the art i» trailable type and comprises stock rail brackets fixed with right hand and left hand stock rails provided at the turnout with special head bolts. Similarly right hand and left hand tongue rail brackets are fixed to their tongue rails with special head bolts. The right hand and left, hand locking cranks are pivoted to the respective tongue rail brackets by means of pin which in turn allow the locking crank to move horizontally. One end of the drive rod is connected to the electric point machine and the other end to the lug of locking bar assembly for providing pulling and pushing action of tongue rail to lock the locking face of stock rail bracket with locking face of locking crank so as to lock t.he turnout to its right hand side or left, hand side.
There are disadvantages associated with the locking device known in the art. One of the main disadvantage is that. this clamp point lock is not. directly locking with the stock rail itself but the locking is effective indirectly through the stock rail bracket and is below the foot of rail.
Another disadvantage with this clamp point lock is that it is of trailable type and can be used
with non~trilable point machine. On Indian Railway the point machines used are of non-trail able type for
working of points.
Another di sad van t.acje is that the holes are drilled in the stock rail for fixing stock rail bracket. Drilling of holes in stock rail in the visinity of the toe weaken the stock rail.
Yet another disadvantage is that the tongue rail brackets and stock rail brackets are different for different rail sections for 52 kg/(Tws) and 60 kg (Tws) turnouts.
Still another disadvantage? is that eccentric bushes once provided at the time of installation cannot be used for further adjustments of tongue rail with its stockrail.
Therefore the main object, of this invention is to propose a clamp point lock to lock the tongue rail directly at foot of its stackra.il.
Another abject of this invention is to propose a clamp point lock Trailable/Non-Trailahle type to be used with trail able/non-trail able point machines respectively to suit local conditions.
Further another object of this invention is to propose 3 clamp point lock non-trail able type to be used with leading stretcher and non-trailable point machine as per practice adapted on Indian Railways.
Another object of this invention is to propose a clamp point lock to fix the stockrail bracket.
to the foot of stockrail with the help of hook bolts to avoid drilling of holes in the stock rail of running
track.
Yet another object of this invention i* to propose clamp point lock to use the same common parts
such as stock rail brackets. Tongue rail brackets hook bolts etc. for different rail sections of 52 kg/60
kg (Tws) turnouts.
Still another object of this invention is to propose a clamp point lock having accentric bush to be used for minor adjustments of variations in track parameters.
Further an object of thin invention is to
propose a clamp point lock to lock the tongue rail directly with its stock rail. A locking crank which in
turn lock the foot of the stock rail, and is possible only when the locking crank is moved in the vertical
direction to lock and unlock the tongue rail with its stock rail and thus avoiding different design and shape
and size of stock rail bracket, tongue rail bracket,
locking crank, fixing bolts etc:.
Another object of this invention is to propose a clamp point lock adapted to work turnouts having 95mm to 160mm opening at toes for trailable type and 95mm to 115mm opening at. toe for non - trai1able type.
Yet. another object of this invention is to propose a clamp point lock with an electric point
machine having 143 mm to 260 mm stroke for trailable type and 220mm to 260mm throw for non —trailable type of
clamp point lock.
Still another object, of this invention in to propose a clamp point lock adapted to be used with an acetsl bush on wear prone areas.
Still another object of this invention i« to propose a clamp point lock which maintain direct lockin.g even at high speed and under heavy loads.
According to this invention there is provided a trailable/non-trailable clamp point lock comprises a
right hand and left hand side stock rail brackets adapted to be secured at the foot of the stock, rails by
means of a hook bolt, right hand and left hand tongue
rail brackets being secured with the respective tongue rails tay means of a special head bolt, lockinq crank« being pivoted with said tongue rail bracket much that to move up and down to lock and unlock said tongue rails with the foot, of said stock rails, the locking bark assembly passing through said tongue rail brackets being supported vertically to operate the locking arms for main line setting/turnout setting of running trains, a drive rod connected to the lug of locking bar assembly being connected to the electric point machine having a throw/stroke of 140-260 mm for trailabln characterised in that, said locking cranks comprises an arm having bore at its fulcrum at one end thereof, locking face and operating face being provided at the other end of said arm such that to lock the tongue rail and provide movement to the* locking bar assembly, said stock rail and tongue rail brackets having a novel construction being provided such that to operate the locking cranks into a vertical position, for trailable clamp point lock with 95mm to 160mm opening at toe and non-trail able clamp point. lock with 95mm to 115mm opening at the and operated with electric point machine having a throw of 220mm to 260mm.
In case of nontrailable clamp point lock first the point get unlocked than both the tongue rails
move tog either with the help of loading stretcher bar for mainline setting O2 turnout setting finally the point is
re locked. The? electric point machine having stroke of 220mm/260mm is used to work non-trailable clamp point
lock.
A clamp point lock according to a preferred embodiment is herein described and illustrated in the accompanying drawings wherein:
Fig.l (A & B) shows the front elevation and plan view of the clamp point, lock known in the art.
Fig.2(A ft B) shows, the front, elevation and plan view of the stock rail bracket known in the art.
Fig.3(A,B ft C) shows the front, side elevation and plan view of the tongue rail bracket known in the art.
Fig.4(A ft B) shows the front elevation and plan of locking crank right hand and left hand known in the art.
Fig.5(A ft B) shows the front elevation and plan view of locking bar assembly known in the art.
Fig.6(A ft B) shows the front elevation and plan view of the trailable clamp point, lock proposed in the present invention.
Fig.7(A ft B) shows the front elevation and plan view of the non-trailable clamp point lock, proposed in the present invention.
Fig.8 (A,B & C) shows the? front, side elevation and plan
view of the stockra.il bracket, of proposed invention.
Fiq.9 (A,B & C) shows the front,, side elevation and plan
view of the tongue rail bracket of proposed invention.
Fiq.l0(A K.'. HO shows the fronl elevalion and plan of
locking crank of proposed invention.
Fig. 11 (A & B) shows the front elevation and plan view of lockinq bar assembly of proposed invention.
Fig. 12 shows the plan view of the turnout fitted with trail able clamp point .lock and switch wetting device (parallel arrangement)
Fig.13 shows the plan view of the turnout fitted with trail able c: lamp point lock and switch setting device (series arrangement)
Fig. 14 show the plan view of the turnout fitted with non-trai1able clamp point lock and switch setting device (parallel arrangement).
Fig.15 shows the plan view of the turnout fitted with non- troi1able clamp point lock and switch setting device (series arrangement).
Referring to the drawings particularly fig.l, the conventional known clamp point lock comprises right
hand and left hand stock rail brackets (fig.2) fixed to the stock rails 1 of the turnout with special head bolts
9. Right and left hand tongue rail brackets 4 (fig.3) are fixed to their tongue rails 3 with special head
bolts 1.0. The right, hand and left hand locking cranks. 5 (fig.4) are pivoted to the tongue rails by means of pin 8 around which the locking crank 5 move horizontally. A drive? rod 19 connected to electric point machine 20 is also connected to a lug 7 of locking bar assembly 6 provided for pulling and pushing of tongue rail to lock it against the locking face 12 of stock rail bracket 2 by means of locking tail 1.1. of locking crank 5 so as, to lock the right, hand tongue rail 3 to its right hand side or left hand tongue rail 3 to its left. hand side with the locking face 12 of attack rail bracket 2. This type of clamp point lock is suitable for trail able points. In this arrangement the open tongue rail move first and at the same time the closed tongue rail get unlocked then both move together.
At the end when the open tongue rail is closed with its stockrail it is 1ocked in its position , open tongue is
further opened to its final position and held in this position with the help of locking bar assembly and
locking bar.
Reference is now made to fig.2 the conventional known stock rail bracket 8 fixed to stock
rail A by means of drilling two holes D in the stock rail for special head bolts C. The trouqh is provided
for accommodating locking bar assembly and locking crank. Tongue rails of the turnout are locked against locking face E. Head F is provided for cover support and two holes G are also provided for fixing of cover.
As shown in fig. 3, the tongue rail bracket. 1 known in the art having holes 4 is fined ho thro tonquft rail 2 by means of special head bolts. A slot 3 is provided to take care of creep in switches.
As shown in fig. 4, the right hand and left.
hand locking crank A known in the art is pivoted about t.he pin B with bronze bush C. Guide D is provided to
keep locking bar assembly in its position. Locking and unlocking of the turnout is done with tail E provided
for the purpose. Slot F is provided to accommodate tongue rail bracket and bronze bush C.
Reference is now made to fig. 5, the locking bar assembly known in the art comprises locklnq bar RH1.
and LH1 both are connectinq together with the help of lug 5. Slots 3 are provided to accommodate the tail end
of locking crank so that, the open tongue is kept in its open position. Ridge 4 is provided to hold the locking
crank in locked position when closed tongue is in closed position. The mount 2 is provided to unlock the
switches. The width of slot 3 is equal to the width of fish tail of locking crank and this type of arrangement
is switchable for trail able points and not for non-trail able points.
Reference is now made to fig.6 the trailable
clamp point lock proposed in this invention comprises right hand and left hand stock rail bracket 7. (fig.8)
fixed at the foot, of the respective stock rail 1 with the help of hook bolts 9. Similarly the right, hand and
left hand tongue rail brackets 4 (fig.9) are secured to the foot of the respective tongue rail 3 with special
head bolts 10. The left and right hand locking crank 5
(fig. 10) are pivoted to tongue rail bracket. 4 such that
to move up and clown to lock and unlcok tongue rail with
the foot of stock rail. The lockinq bar assembly 6 passing through right and left hand tongue rail
brackets 4 is guided vertically and also supported by stock rail brackets 4. One end of the drive rod 19 is
connected to the lug 7 of locking bar assembly 6 and other end to the driving unit/electric point machine 20
to provide 143 mm to 260 mm throw to work the clamp point, lock.
During operation when the point in macchine 20 in operated it impart stroke 143mm to 260mm and give push movement to the locking bar assembly 6 through the lug
7. When the locking bar assembly A move towards right, tail end .11 of right hand locking crank 5 is pushed
toward right hand side so long it is their in the notch 14 of locking bar assembly. At the same time the tail
end 11 of the left hand locking arm 5 is unlocked when hit. by face 13 and fall in the notch 14 thus unlocking
the left hand tongue rail from its left hand stock. rail 1. The further movement of the locking bar assembly 6
towards right hand side move both the tonque rail towards right hand side. The right hand side of tonque
rail 3 butt against the right, hand stock rail 1 and further movement, of locking bar assembly push the tail
end 11 of the lockinq crank 5 out of notch .1.4 and butt against the lockinq face 12 of stock rail bracket 2.
Thus the right hand tonque rail 3 IB locked with its stock rail 1 at its foot with the locking face .12 of
right hand stock rail bracket 2 with the help of tail 11 of lockinq crank 5. The locking crank S is held in thin
position with a mount 15 of lockinq bar assembly 6. Now the paint is said to be locked in its right hand setting
or mainline setting of the turnout for running trains. Similarly, for left hand aide setting or turnout side setting the drive rod 19 is pulled by the electric point machine 20 and also pulling locking bar assembly 6 towards left, by means of lug 7. The right, hand tongue rail 3 is unlocked when tail 1.1. is hit by face 13 of locking bar assembly. At the same time? left hand side tongue rail move towards left because the tail 11 already their in the? notch 14.
Now both the tonque rails moves towards
left. Finally the left hand tongue rail 3 butt with its stock rail 1 and tail end 11 of locking crank 5 come-out of the notch 14 thus lacking the left hand tongue rail 3 with faces 12 on stock reil bracket 2 end tail 11 of
left hand locking crank 5. The tail 11. of lockinq crank is kept in its locked position by the mount 15 of
locking bar assembly. At the same time the right hand tongue rail 15 kept eway from the stock rail by an
amount of 95 mm to 160 mm at toe. Now it i is Bald that the point is set and locked for turnout setting for
running of trains (as shown in fig.&).
Reference is now made to fiq.7 the nan trailable clamp point lock proposed in this invention
comprises right hand and left hand stock rail bracket 2 (fig.8) fixed at the foot of the respective stock rail 1
with the help of hook bolts 9. Similarly the right hand and left hand tongue rail brackets 4 (fig.9) are secured
to the foot of the respective tongue rail 3 with special head bolts 10. The left and right hand locking crank 5 (fig. 10) are pivoted to tongue rail bracket. 4 such that
to move up and dawn to lock and unlcok tongue rail with the foot, of stock rila. The locking bar assembly 6
passing through right and left. hand tongue rail • brackets* 4 is guided vertically and also supported by
stock rail brackets. 4. One end of the drive rod 19 is connected to the lug 7 of locking bar assembly 6 and
other end to the driving unit/electric: point machine 20 to provide 220 mm to 260 mm throw to work. the clamp
point lock.
During operation when the pni.nl machine? 20 i« operated it imparts stroke 220 mm to 260mm and give punh movement to the lacking bar assembly 6 through the lug
7. When the locking bar assembly 6 move towards right, tail end 11 of right hand locking crank 5 remain in its
position and also right hand tongue rail is stationery in its open position. During this time the tail end 11
of the left hand locking arm 5 is unlocked when hit by face 13 and fall in the notch 14 thus unlocking the left
hand tongue rail from its left hand stock rail .1. The further movement of the locking bar assembly & towards
right hand side move both the tonque rail towards riqht hand side. The riqht hand side of tongue rail 3 butt against the riqht hand stock rail 1 and further movement of lockinq bar assembly push the tail end .1.1 of the locking crank 5 out of notch .1.4 arid butt against the
locking face 12 of stock rail bracket 2. Thus the riqht hand tonque rail 3 is locked with its stock rail 1 at
its foot with the lockinq face 12 of riqht hand stock rail bracket 2 with the help of tail 11 of lockinq crank
5. The lockinq crank 5 is held in this position with a mount 15 of lockinq bar assembly 6. Now the paint is
said to be locked in its riqht hand setting or mainline Betting of the turnout for running trains. Similarly,
for left hand side setting or turnout side setting the drive rod 19 is pulled by the electric point machine 20
and also pulling locking bar assembly 6 towards left by means of luq 7. The right hand tongue rail 3 is
unlocked when tail 1.1 is hit by face 13 of locking bar
assembly. With non-trail able type of clamp point lock the RH and LH tongue rails are also provided with
leading stretcher bar 21.
Wow hath the tongue rails move towards left..
Finally the left hand tori quo rail butt with its stock rail 1 and tail end 11 of locking crank 5 comeout. of the
notch 14 thus locking the left hand tongue rail 3 with face 12 on stock rail bracket 2 and tail .11 of left
hand locking crank 5. The tail it of locking crank is kept in its locked position hy the mount 15 of locking
bar assembly. At the same time the right hand tongue rail is kept away from the stock rail by an amount of 95
mm to 115 mm at. toe. Now it is said that the point IB set and locked for turnout, setting for running of trains
(as shown in fig.7).
Referring to the drawings as shown in fig. 8 the stock rail bracket, proposed in this invention is of
different shape end design, and comprises the base 1 butting against the foot 6 of stock rail 2. Stock rail
bracket is fixed to the stock rail with hook bolts 3. Rectangular slat 4 is provided to accommodate locking
bar assembly and locking crank to take care of creep in switches screw 5 is provided to keep the bracket, in its position for different rail sections of 52 kg or 60 kg.
The tongue rail is locked directly to the foot of stock rail with the locking face 7 provided for the purpose.
Two holes 8 ere provided for hook bolts. The bracket is common for 52kg and 60kq (Tws) Burnouts.
Referring to the drawings as shown in fig.9
the tongue rail bracket proposed in this invention is of different design, shape, size and comprising 'U' shape
arms 1 and fixed at the foot 3 of tongue rail 2 with special bead bolts 4. Hole 5 are provided to
accommodate locking arm and grub screw 7 to keep the pin in its position after adjustment. Locking bar
assembly is kept in the vertical position and move to the fro between outside faces 6.
Referring to the drawings as shown in fig. 10 the right hand and left hand locking cranks proposed in
this invention is of different in shape and design comprising accotal bush is fitted in a bore at it
fulcrum. Accentric. bush 2 is fitted in the bore and tightened on the pin. At the other end of the locking
crank operating face 3 is provided to operate the
locking crank in the upward direction with the help of locking bar assembly 6 shown in fig.11 so that. the
tongue rail is locked with the? foot of stock rail with help of locking face 1 on locking crank. Extension S is
provided for non trailable clamp point lock to ensure unlocking of the tongue rail when extension 5 is hit by
extension 2 on locking bar assembly (shown in fig.11). The extension 5 on locking crank and exteaion 2 on
locking bar assembly are optional. These may or may not be provided because leading stretcher bar serve the
purpose of unlocking the points and keep the open tongue
in its open position.
Referring to the drawings as shown in fig.11,
the locking bar assembly proposed in the invention is of different shape and design comprising locking bar RH1
and locking bar LH1 both connected together with the help of lug 5. The extension 2 is optional provided to
unlock the locking crank shown in fig..10. Slot 3 are provided to hold the locking crank when tongue rail is
in its open position and mount 4 provided to keep the
locking crank in their raised position to lock the closed tongue rail. The tail end of crank RH and LH
move upward or downward to lock or unlock the tongue rail as shown in fig. 6/7.
Referring to the drawings as shown in fig.. 1.2,
showing the plan view of a turnout of proposed invention. The clamp point lock I trailable type is
secured to the switches 6 and 7 of the turnout. The point machine 2 is connected to the clamp point lock 1
with the help of drive rod 4, lug 5 and .locking bar assembly 8 of clamp point lock 1. The other end of the
locking bar assembly 8 is connected to spring setting device 3 by means of pair of cranks 9 provided for the
purpose.
During operation with the help of point machine 2 the switch rail 6 and 7 moves form left hand
to right hand side for turnout, setting and from right. hand side to left hand side for mainline setting of
running trains. At the time of working for turnout
setting the point machine 2 push the? drive; rod 4, lug 5 and locking bar assembly B of clamp point lock towards
the riqht hand side. At the same time the same pull is. transferred to the spring setting device 3 by means of
locking bar assembly 8 and pair of cranks 9. The closed switch 7 of the turnout is unlocked both the switches
are moved towards riqht hand side with the help of lead my stretcher bar 1(3, switch 6 butt against the right
hand stock rail and switch 7 is pulled away from the
left hand stock rail and finally the switch 6 is locked
for turnout setting of running trains. During operation also the locking bar assembly transfer the push movement
to the pair of cranks and give stroke to the spring
setting device.
During operation of the first half the spring setting device, it store the Renergy and switch 6 and 7 are moved from left, hand side to right hand side and during the second half its energy is released and push
the right hand switch 6 to butt its stock rail right hand and left hand switch 7 is pulled away from its
stock rail left, hand to provide adequate clearance for
wheel of running train. Now the route is set for
turnout. setting. Similar is the operation when the
switches are moved towards left hand side for mainline
setting of route as shown in fig.12.
Referring to the drawings as shown in fiq.13, showing the plan view of turnout of proponed invention. The non-trsileble clamp point lock 1 is secured to the switches 6 and 7 of the turnout. The point, machine 2 is connected to the clamp point loc k with the help of drive rod 4, lug 9 and locking bar assembly 0 of clamp point lock. In this arrangement the pair of cranks 9 are on the same side of the point machine. One crank in connected to the drive slide of point machine 2 and the other crank to spring setting device 3.
During operation with the help of point machine 2 the switch rail 6 and 7 moves from left to
right, for turnout setting and from right to left. for mainline setting of running trains. At the time of
working for turnout setting the point, machine 2 push the drive rod 4, lug 5 and locking bar assembly 8 of clamp
point. lock towards the right hand side. At the same
time the drive? slide of lite point machine pull the pair
of cranks 9 thus operating the spring setting device 3.
The closed switch 7 of the turnout is unlocked, both
switches are moved towards the right hand side with the help of leading stretcher bar 1(3. Switch 6 butt against
the right hand stock rail and switch 7 is pulled away from the left hand stock rail, and finally the switch 6
is locked for turnout setting of running trains. During operation also the locking bar assembly transfer
the push movement to the pair of cranks and give stroke to the spring setting device.
At the same time? the spring setting device is
also operated by means of pair of cranks, right hand tongue 6 butt against the right hand stock rail, left
hand tongue 7 is pulled away from left hand stock rail providing adequate flange way clearance of running
trains. Now the route is set for turnout setting. Similar is the operation when the switches are moved
towards left hand side for main line setting of route as shown in fig.13.
Referring to the drawings as shown in fig. 14,
showing the plan view of a turnout of proposed invention. The nan - trailable clamp point lock 1 is
secured to the switches & and 7 of the turnout. The point, machine 2 is connected to the clamp point lock 1
with the help of drive rod 4, lug 5 and locking bar assembly 8 of clamp point lock 1. . The other end of this
locking bar assembly 8 is connected to spring netting device 3 by means of pair of cranks 9 provided for the
purpose. Leading stretcher bar .10 is also provided on turnout for non-trail able movements.
During operation with the help of point machine 2 the switch rail 6 and 7 moves form left hand
to right hand side for turnout setting and from right hand side to left hand side for mainline setting of
running trains. At the time of working for turnout setting the point machine 2 push the drive rod 4, lug 5
and locking bar assembly 8 of clamp point lock towards the right hand side. At the same time the same pull is
transferred to the spring setting device 3 by means of locking bar assembly 8 and pair of cranks 9. The closed
switch 7 of the turnout, is unlocked both the switches
are moved towards right, hand side switch A butt againwt the right, hand stock rail and switch 7 is pulled away
from the left hand stock rail and finally the switch 6 is locked for turnout. setting of running trains. During
operation also the locking bar assembly franster the push movement, to the pair of cranks and give stroke to
the spring sotting device? for turnout setting of running trains.
During operation of the first half the spring
setting device, it store the energy and switch 6 and 7 are moved from left hand side to right hand side and
during the second half its energy is released and push the right hand switch 6 to butt its stock rail right
hand and left hand switch 7 is pulled away from its stock rail left hand to provide adequate clearance for
wheel of running train. Now the route is set for turnout setting. Similar is the operation when the
switches are moved towards left hand side for mainline setting of roule as shown in fig . 14.
Referring to the drawings as shown in fig. 12, showing the plan view of turnout of proposed invention.
The non-trailable clamp point lock 1 is secured to the switches A and 7 of the turnout. The point, machine 2 is
connected to the clamp point lock with the help of drive rod 4, lug 5 and locking bar assembly 8 of clamp point
lock. In this arrangement, the pair of cranks 9 are on the same side of the point machine. One crank is
connected to the drive slide of point machine 2 and the other crank to spring setting device 3. Leading
stretcher bar 10 is also provided on turnout for non-trailable movements.
During operation with the help of point
machine 2 the switch rail A and 7 moves from left to right. for turnout setting and from right to left for
mainline setting of running trains. At the time of working for turnout setting the point machine 2 push the
drive rod 4, lug 5 and locking bar assembly 8 of clamp point lock towards the right hand side. At the same
time the drive slide of the point machine pull the pair of cranks 9 thus operating the spring setting device 3.
The closed switch 7 of the turnout is unlocked, both switches are moved towards the right hand Bide. Switch
6 butt against the right hand stock rail and switch 7 is pulled away from the left hand stock rail, and finally
the switch 6 is locked for turnout setting of running trains.
At the same time the spring setting device is
also operated by means of pair of cranks, right hand tongue 6 butt against the right, hand stock rail, left.
tongue 7 is pulled away from left hand stock rail providing adequate flange way clearance of running
trains. Now the route is set for turnout. setting. Similar is the operation when the switches are moved
towards left hand side for main line setting of route as shown in fig. 1 5 .




CLAIM;
1. A trailable/non-trailable clamp point lock comprises a right hand and left hand side stock rail brackets adapted to be secured at the foot of the stock rails by means of a hook bolt, right hand and left hand tongue rail brackets being secured with the respective
tongue rails by means of a special head bolt, locking cranks being pivoted with said tongue rail bracket
such that to move up and down to lock and unlock said tongue rails with the foot, of said stack rails, the
locking bark assembly passing through said tongue rail brackets being supported vertically to operate the
locking arms for main lint? setting/turnout setting of running trains, a drive rod connected to the lug of
locking bar assembly being connected to the electric point machine having a throw/stroke of 140-260 mm for
trailable characterized in that, said locking cranks comprises an arm having bore at its fulcrum at one end
thereof, locking face and operating face being provided at the other end of said arm such thai to lock the
tongue rail and provide movement to the locking bar
assembly, said stock rail and tongue rail brackets having a novel construction being provided such that to
operate the locking cranks into a vertical position, for trai lab le clamp point lock with 95mm to .160mm opening at
toe* and non-trailabits clamp point lock with 95mm to 115mm opening at toe and operated with electric point
machine having a throw of 220mm to 2
2. A clamp point lock as claimed in claim I, wherein
ssaid stock rsil bracket comprises a base adapted to bo
butted against the foot of said stock rail. a rectangular slot being provided into said base such that
to accommodate said locking bar assembly and locking cranks, a locking face being provided at one end of maid
base so as to lock said bracket with the foot, of the stock rail by means of a screw.
3. A clamp point lock as claimed in claim 1 wherein
said tongue rail bracket, comprises an 'U' shaped arm
adapted to be secured with the foot of said tongue rail by means of a special heed bolt, holes are provided in said arms to accommodate said locking arm, a grub screw is provided near said hole to keep the pin in its position with said tongue rail.
4. A clamp point, lock ar, claimed in claim .1, wherein
said locking crank having fulcrum at one end i.B adapted
to move upward or downward at its tail end to lock the tongue rail with its stock rail in closed position,
extension provided is optional for non-trail able clamp point lock, accentric bush provided at. fulcrum in
locking crank are used for minor adjustment of clamp point lock, at site.
5. A trailable clamp point lock as claimed in claim
if wherein the said locking bar asembly comprises A
slot equal to the width of the tail of the said locking arm, for non-trailable clamp point lock, said locking
bar assembly comprises a bigger slot, almost double the width of the tail of the said locking arm, the
extensions on locking bar assembly and locking arms are optional due to the provision of leading stretcher bar.
6. A clamp point. lock substantially as herein
described and illustrated.

Documents:

537-del-2000-abstract.pdf

537-del-2000-claims.pdf

537-del-2000-correspondence-others.pdf

537-del-2000-correspondence-po.pdf

537-del-2000-description (complete).pdf

537-del-2000-drawings.pdf

537-del-2000-form-1.pdf

537-del-2000-form-19.pdf

537-del-2000-form-2.pdf

537-del-2000-form-3.pdf

537-del-2000-gpa.pdf


Patent Number 220661
Indian Patent Application Number 537/DEL/2000
PG Journal Number 30/2008
Publication Date 25-Jul-2008
Grant Date 30-May-2008
Date of Filing 26-May-2000
Name of Patentee MOHINDER KAUR
Applicant Address
Inventors:
# Inventor's Name Inventor's Address
1 PAR UPKAR SINGH
2 MOHINDER KAUR
PCT International Classification Number E01B 9/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA