AN IMPROVED PROTECTION DEVICE FOR A VEHICLE CYLINDER LOCK
FIELD OF INVENTION
'I'he present invention relates to an improved protecting device for a vehicle cylinder
lock. More particularly, the said invention relates to a safety device for a cylinder lock
capable of facilitating the automatic closing operation of a shutter while removing a
mechanical key (where the shutter closes the key hole) and preventing the mechanical
key to strike with the shutter while moving to close position and thereby achieving the
entire operation as smooth, devoid of any unwanted noises and scratches on the
mechanical key and improving the theft prevention effect.
BACKGROUND AND PRIOR ART OF THE INVNETION
In general, automobile cylinder locks are locked by means of a mechanical key.
IIowever, the said locks can be easily tampered to gain access of the vehicle. Vehicle
locks are tempered by any burglar by breaking such locks by inserting a wedge shaped
tool or screwdriver between the cylinder lock.
'l'herefore, in order to protect the cylinder lock, people have attempted to provide housing
on the cylinder lock, which comprises a shutter comprising of magnet lock. 'The said
shutter is required to be open and close with or without key by user. There are various
complicated mechanism provided to operate the shutter.
One such mechanism provides a cylinder lock protection system in which the shutter
plate is closed and opened using a key.
'I'here are few existing cylinder lock protection system, wherein a shutter plate is moved
to open position from closed position when a magnet lock is unlocked, thereafter, the
shutter plate returns to closed position by pressing the button .In such mechanisms user
has to perform an additional operation of pressing the button to close the shutter
In such mechanisms it is experienced that in certain situations because of human
tendencies, there are possibilities that user forgets closing the shutter or else take such
extra care for closing the shutter.
Another mcchanism provides a cylindcr lock protection system in which, aftcr a shuttcr
platc for closing a key hole is moved to an opcn position in response to a magnet lock
being unlocked, the shuttcr platc automatically returns to a closed position in response to
a mcchanical key inserted into the key hole bcing withdrawn, thus enhancing the
operability and ensuring that closing the shutter plate is not forgotten.
IIowever, in order to achieve opcn and close condition the abovc mentioned mcchanism
is achieved by utilizing more no. of components which work in tandem making the
functioning of the entire asscmbly cumbersome and there is more wear and tear between
the large numbers of components. In addition, it is expensive to manufacture the
components and as a hole the cylindcr lock assembly is expensive.
It has also been observed in abovc mentioned protective devices with auto closing
feature, in somc cases the auto closing mechanism is actuated by performing an extra
operation of the key may be additional key push.
Also in somc cases when the shuttcr platc automatically returns to a closed position after
removal of mcchanical key from cylindrical lock, it strikes with the key continuously till
key is fully withdrawn causing wear of the key and the operation is not smooth and
involves noises.
Therefore, the cylinder lock protection assembly is irrational to certain extent and due to
one or more of the aforesaid reasons, there may arise a situation wherein the cylindcr lock
protcction assembly results in user inconvenience.
IIencc, there exists a strong need to provide an improvcd protecting device for vehicle
cylindcr lock enabling auto return operation of shutter by making the entire assembly
simple, smooth, robust and devoid of unwanted noises and wear of mcchanical key.
OBJECTIVES OF THE INVENTION
'l'hc primary objective of the present invention is to provide an improvcd protecting
device for a vehicle cylinder lock having an improved assembly and construction which
addresses at least somc of the disadvantages of the conventional cylindcr lock protcction
assembly.
Another objective of the present invention is to provide a protecting dcvice for cylindcr
locks having auto return opcration of shutter while removing key.
Yet another objective of the present invention is to provide a protecting dcvice for
cylindcr locks having auto rcturn operation of shutter and the entire opcration is devoid of
any unwanted noises and scratches (i.e. wear and tear) on the mcchanical key surface.
Yet another objective of the present invention is to provide an improved protecting
dcvice for the cylindcr lock having simple design and is user friendly.
Yet anothcr objective of the present invention is to provide an optional button 1 switch to
automatic closing of shutter at ignition OFF position.
SUMMARY OF THE INVENTION
'I'he present invention relates to a cylinder lock protection device for a vehicle whereby
the automatic rcturn of a shutter plate to closc position (where the shutter closes the key
hole) from the open position (where the shutter opens the key hole) in accordance with
the removing of mcchanical key and preventing the shutter plate from striking with the
mcchanical key while moving to close position automatically. Further, there exists an
optional button to closc the shutter automatically at OFF position.
I3HIEF DESCRIPTION OF FIGURES
Further aspects and advantages of the present invention will be readily understood from
the following detailed description with reference to the accompanying drawings.
Ilcference numerals have been used to refer to identical or similar functionally elements.
'I'hc figures together with a detailed description below, are incorporated in and form part
of the specification, and serve to further illustrate the aspects and explain various
principles and advantages, in accordance with the present invention wherein:
Fig. 1 illustrates the exploded view of a protecting device assembly for vehicle cylinder
lock in accordance with an aspect of the present invention;
Figure 2 illustrate the top cover portion of cylinder lock in accordancc to prcsent
invcntion, whcrcin it exhibited that there arc three slots 1) to insert rear part of key for
opening the shutter plate, 2) to insert front part of key in the key hole 3) to mount a
switch for manual closing of shuttcr plate.
Fig. 3 illustratcs top vicw of the casing or housing of cylinder lock in accordance with an
aspect of the prcsent invcntion, whcrcin, the shutter plate is auto closed, while removing
ignition key.
Fig. 4 illustratcs top vicw of the casing or housing of cylinder lock in accordancc with an
aspcct of the prcsent invention, whcrcin, shuttcr and key slot show IJN1,OCK position of
stccring and ignition OFF position and the locking means arc operated by switch module.
1:ig. 5 shows parts of cylinder lock wherein a pinion, CAM, locking member and locking
mcans arc exhibited exclusively in accordancc with one aspcct of the prcsent invcntion.
Figure 6 shows the shutter move to the left side, the groove / slot in the shuttcr
correspond with the key hole and at the same time the CAM lobe pushes the locking
means so that shutter plate moves to left side and the slot (2a) in the side surface of the
shuttcr get engaged with locking means.
Figure 7 illustrates top vicw of the casing or housing of cylinder lock in accordance with
an aspcct of the present invcntion, wherein the shutter platc is depicted in open condition
and key slot show 1,OCK position of steering and ignition. It also shows the effect on
CAM and locking member while inserting the mechanical key.
Fig. 8 illustratcs top view of the casing or housing of cylinder lock in accordance with an
aspcct of the present invcntion, wherein, the locking means prevent the closing of shuttcr
platc and key slot show UN1,OCK position of steering and ignition OFF position.
Fig. 9 and 10 illustrates top view of the casing or housing of cylinder lock in accordancc
with an aspcct of the present invcntion, wherein, the locking means prevent the closing
of shuttcr and key slot show ignition OFF position to ignition ON position.
Fig. 11 illustrates top view of the casing or housing of cylinder lock in accordance with
an aspect of the present invention, wherein, the locking means prevent the closing of
shutter and key slot show ignition ON position to LOCK position.
lig. 12 illustrates top view of the casing or housing of cylinder lock in accordance with
an aspect of the present invention, wherein, a cover plate is provided below the shutter
which having a slot correspond to the slot provided in the shutter plate .
Skilled artisans will appreciate tkdt elements in the drawings are illustrated for simplicity
and have not necessarily been drawn to scale. For example, the dimensions of some of
the elements in the drawings may be exaggerated relative to other elements to help to
improve understanding of aspects of the present invention.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
While the invention is susceptible to various modifications and alternative forms, specific
aspect thereof has been shown by way of example in the drawings and will be described
in detail below. It should be understood, however that it is not intended to limit the
invention to the particular forms disclosed, but on the contrary, the invention is to cover
all modifications, equivalents, and alternative falling within the spirit and the scope of the
invention as defined by the appended claims.
'I'he Applicants would like to mention that the drawings are drawn to show only those
specific details that are pertinent to understanding the aspects of the present invention so
as not to obscure the disclosure with details that will be readily apparent to those of
ordinary skill in the art having benefit of the description herein.
'I'he terms "comprises", "comprising", or any other variations thereof, are intended to
cover a non-exclusive inclusion, such that a setup, device that comprises a list of
components does not include only those components but may include other components
not expressly listed or inherent to such setup or device. In other words, one or more
elements in a system or apparatus proceeded by "comprises.. . a" does not, without more
constraints, preclude the existence of other elements or additional elements in the system
or apparatus.
In thc following dctailed dcscription of the aspccts of the invention, rcfcrencc is madc to
thc accompanying drawings that form part hcrcof and in which arc shown by way of
illustration spccific aspccts in which the invcntion may bc practiccd. Thc aspects arc
dcscribcd in sufficient details to cnable thosc skilled in thc art to practice the invcntion,
and it is to bc understood that other aspects may be utilizcd and that charges may be
madc without departing from the scope of the prescnt invention. The following
dcscription is, thercforc, not to be takcn in a limiting sensc, and the scope of the prcscnt
invcntion is dcfincd only bc thc appended claims.
Accordingly, thc prcscnt invcntion rclate to a cylinder lock protcction dcvicc as shown in
figurc 1, comprising mounting body (I), shuttcr platc (2), transmission mcans (3), CAM
(4), first part (4a), sccond part (4b), lobe (4c), torsion spring(5), Locking rnembcr (6),
locking rnembcr first arm (6a), Locking member second (6b), first locking mcan (7),
sccond locking mcan (8), locking means spring (9a, 9b), cover (lo), switch (1 I), Lever
torsion spring (12), covcr platc (13) (it is mounted with case over the cam and lever).
Accordingly, thc present invention rclates to an improved protection device for a vehicle
cylindcr lock providcd with a key hole and an auto shutter mechanism to cover the said
kcy hole, thc said device comprising: a mounting body (1) and a cover (lo), the covcr
(1 0) is co-axially mountcd on thc mounting body (I), the said cover (10) consisting a key
insertion hole (1 5), a key slot (17) and a switch slot (1 8) to move thc switch (1 1) wherein,
thc said kcy inscrtion hole (1 5) of the cover (10) is aligned with the kcy holc (1 6) of the
mounting body (1) of cylindcr lock; a shutter platc (2) being slidably fixed on the covcr
platc (13) within the guiding tracks (19) on the mounting body (I), thc said shutter platc
(2) having a slot (20) and opcrationally configured with the transmission mean (3) at the
first longitudinal side (21), thc shuttcr plate (2) is capable of being engage and disengage
with thc locking mcans (7, 8) during the shuttcr platc (2) opcning and closing opcration
from the sccond longitudinal sidc wall (22), the locking means (7, 8) arc disposcd in thc
slots of thc mounting body (1) and being connected with a switch (1 1); a locking
member (6) pivotally mounted on the mounting body (1) being in communication with
the transmission mcan (3) by a sccond arm (6b) and the CAM (4) by a first arm (6a);
thc said CAM (4) being ccntrally placed below the shutter plate (2) and having two part
assembly.
A first aspeet of the present invention, wherein the shutter plate (2) having the slot (20)
ofLset to the central portion of the shutter plate (2) having an open face towards the
locking means (7, 8).
A seeond aspeet of the present invention, wherein the shutter plate (2) having teeth on the
first longitudinal side wall (21) up to a predetermined length that remain in mesh with the
teeth of the transmission mean (3).
Another aspeet of the present invention, wherein the shutter plate (2) having at least one
slot (2a) on the seeond longitudinal side wall (22) of the shutter plate (2).
Yet another aspeet of the present invention, wherein the shutter plate (2) is having
rectangular shape.
Yet another aspeet of the present invention, wherein the shutter plate (2) reciprocates on
the guiding tracks (19) disposed on the top surface of the eover plate (13) that is
embedded in the mounting body (1) of the cylinder loek.
Yet another aspeet of the present invention, wherein the shutter plate (2) is located above
the CAM profile.
Yet another aspeet of the present invention, wherein the eover plate (13) is disposed
above the CAM (4), having a slot (25) eo-axially above the key hole ( 16).
Still another aspeet of the present invention, wherein the locking means (7, 8) resiliently
engaged in the slots provided in the mounting body (1) of cylinder loek and capable of
being push by the CAM (4) and being engaged or disengaged with the seeond
longitudinal side wall (22) of the shutter plate (2).
Yet another aspeet of the present invention, wherein the locking means (7, 8) are having
'1'-shape structure and provided with a protrusion on the top surface to engage with the
switch (1 1) on the eover (10).
Yet anothcr aspect of thc present invention, wherein the locking member (6) is having Ushape
profile and pivotally mounted, offset from the center.
Yct anothcr aspect of the present invention, wherein the second arm (6b) of the locking
membcr (6) is in communication with the transmission mean (3) and the first arm (6a) is
in communication with the CAM (4).
A furthcr aspect of the present invention, wherein the first part (4a) and thc second part
(4b) are disposed in a manner that second part (4b) moves with rcspect to the first part
(4a) during insertion and withdrawal of the key to energize & de-energize thc springs
rcspcctively.
Yct another aspect of the prescnt invention, wherein the first part (4a) of the cam (4)
consists of a lobe (4c) which pushes the resiliently energized locking means (7,8) at OFF
I'OSI'I'ION and LCOK POSI'I'ION rcspectively.
Yet another aspect of the present invention, wherein the key hole (16) is covered by the
first part (46) and the second part (4b) of the CAM (4).
Yct another aspect of the prcsent invention, wherein the transmission mean (3) is
mounted with a torsion spring (5) and having teeth that remain in mesh with teeth on the
shutter plate (2).
Yct another aspect of the present invention, wherein the transmission mcan (3) is tend to
angularly displaced towards the second arm(6b) of the locking member (6), due to the
torsion spring (5) force.
Yet another aspect of the present invention, wherein the transmission means 1 (3) having
top surface exposed from the cover (10) and being accessible to the user.
Still another aspect of the present invention, wherein the top surfacc of transmission
mcan (3) is having a key slot (3b ) in accordance with thc shape and configuration with
back part of ignition Kcy.
A furthcr aspcct of thc prcsent invcntion, whcrein thc shuttcr platc (2) is opencd from
1,OCK position, by placing thc back part of kcy in key slot (3b) and rotating in clockwisc
dircction, thc shuttcr platc (2) is bcing locked by the first locking mcan (7) at this position
to rcstricts thc movcmcnt of the shuttcr plate (2) to closc condition (i.c. left side).
A furthcr anothcr aspcct of thc prcscnt invention, wherein from LOCK position to OFF
position of ignition kcy, thc shuttcr plate (2) is locked by thc second locking mean (8) by
rcleasing thc locking from thc first locking mean (7).
Still anothcr aspect of the present invention, wherein the auto shutter mechanism close
thc shuttcr plate (2) upon rotating the key from OFF position to LOCK position and
withdrawing thc samc, the auto shutter mechanism involves rotating thc CAM (4) from
OFI: position to LOCK position, the sccond locking means (8) is pushcd by a lobc (4c)
of the CAM (4) that rcleascs the locking of shutter plate (2) by locking mean (8), and
thc shuttcr platc (2) tends to movc to de-energize the transmission mcan (3) whilc thc
shuttcr plate (2) is stoppcd by the sccond arm (6b) of the locking member (6) and upon
withdrawing of kcy lcads to rotate the Locking member (6) away from the transmission
mcan (3) by torsion spring (5), result of which the shutter plate (2) movcs to closed
position automatically.
Accordingly, thc prcsent invention relates to a protective device for a vehicle cylindcr
lock, wherein said cylindcr locks having a key hole (16) and being operable by using a
kcy (K), said dcvice comprising: a covcr (10) wherein the said cover member having a
kcy slot (1 5) which corresponds to said key hole (1 6) of said cylinder lock, a slot (1 7) for
inscrtion of back part of key, and slot (1 8) for switch (1 1) as shown in figure 2 .
As shown in figurc 1, the mounting body (1) comprising a CAM (4) bcing disposcd
ccntrally below to the covcr plate (13) and having two part assembly, sccond part (4b)
bcing in contact with a locking mcmbcr (6) at its first arm (6a). 'I'hc locking membcr (6)
includes a torsion spring (5) which energizes and providcs a pivotally cngaged locking
incmbcr (6) that remains in contact of second arm 6a with thc sccond part (4b) of the
CAM (4). The locking mcmber (6) has a sccond arm (6b) that remains operationally
configurcd with transmission mcan (3).'l'he said transmission means (3) is a pinion .
In addition, as shown in figure 1, the mounting body (I) also comprising two locking
mcans (7) and (S), which are operational configured with CAM (4) and shutter plate (2).
As shown in figure 1 and 7, Cylinder mounting body (1) having guiding tracks (19)
extcnds in both dircction from kcy hole (16); a shutter platc (2) being slidably mountcd
on said guiding tracks ( 19) having a slot (20). The shutter plate (2) is rcctangular platc
incorporatcd with a slot (20) at it onc cnd and having two longitudinal sidc walls (2 1, 22)
and two lateral sidcs (23, 24). I'hc shuttcr plate (2) is having teeth's on first longitudinal
sidc (21) and operationally configured with teeth of transmission means (3). A covcr
platc (1 3) (as shown in figurc 12) is provide below the shutter plate (2) and provide with
a slot (25) correspond to the slot (20) provided in the shutter plate (2).
WORKING OF SHUTTER
As shown in figure 3, mounting body (I), shutter plate (2) moving from closing position
to opcning position (as shown in fig. 7) over the key hole (16), a torsion spring (5) in the
transmission mean (3) which gets energized in the opening position and tends to move
thc shuttcr plate (2) towards thc closing position from the opening position, locking
mcans (7,s) lock the shuttcr platc (2) at Lock position (vehiclc lock position) and OFI;
position (at which ignition systcm stops) respectively. In this protection device for
cylindcr lock, two parts (4a, 4b) of CAM (4) are disposed in such a manncr that member
sccond part (4b) moves with respect to first part (4a) during insertion and withdrawal of
thc mcchanical key.
SHUTTER OPENING
As shown in figure 7, the shutter plate (2) having teeth (26) which are in mesh with the
tceth of the pinion (3) and provides smooth reciprocating motion of the shutter plate (2).
At first stagc, at LOCK position (i.e. a position at which the steering is locked), the
shuttcr plate (2) cover the central key hole (16) portion. The shutter plate (2) which is
connected with pinion (3) opens by insertion of rear side of the ignition key in the slot
(1 7) and rotatcs in clockwise direction (as shown in figure 2).
As the shutter platc (2) movc to the lcft sidc (I,), the groove / slot (20) in the shutter platc
(2) correspond with the key holc (16) and at this position the lobe (4c) of the CAM
pushes the sccond locking means (8) so that shutter plate (2) moves to lcft side and the
slot (2a) in the second longitudinal side wall (22) of the shutter platc (2) get engaged
with first locking mcan (7) as shown in figure 6 . Due to this engagement, the shutter
platc (2) cannot movc to the right sidc to covers the key holc (16) portion. In other
words, the shutter platc (2) remain open on the key hole (16) and the user can remove the
rear sidc of the ignition key from the slot (17) and ready to place the front side of the
ignition key in the key holc (16).
KEY INSERTION
As shown in figure 7, the key holc (16) is covered by two parts of CAM (4a, 4b) and as
soon as the user insert the front portion of the ignition key in the key hole (16), sccond
part (4b) of CAM (4) moves apart with respect to first part (4a) of CAM (4). The said
movement of sccond part 4b of CAM (4) pushes locking member (6) that subsequently
start to rotate through a pivot (la). In other words, the CAM (4) second part (4b)
energized by the springs and the pivoted locking member (6) rotatcs through the pivot at
la to energize the torsion spring (12).
As a result, at lock position, as shown in fig. 7, sccond arm (6b) of locking
member (6) moves closer to the transmission mean (3), whereas at OFF position as
shown in fig. 8 second arm (6b) of locking member (6) makes contact to the transmission
mcan (3), hence prevent the shutter plate (2) to close till the key removed from the
keyhole (1 6).
LOCK POSITION TO IGNITION OFF POSITION
As shown in figure 8, the ignition key rotates from LOCK POSITION (i.e. Steering
lock) to OFF POSITION (i.e. the position at which ignition stops), lobe (4c) rotates
towards first locking mean (7) and pushes the first locking mean (7) against the spring
force (spring 9b).
As shown in figure 8, the second locking mean (8) moves out due to the spring
forcc (spring 9a) and the locking mean(7) is pushed by the lobe (4c) against the spring
force (spring 9b), hence, the slot (2a) of shutter plate (2) is disengaged with the first
locking mcan (7). 'i'hcrcfore, as a result shutter plate (2) slightly moved right side due to
resilient energy of transmission means (3) and locked by the second locking mean (8).
IGNITION OFF POSITION TO IGNITION ON POSITION
As shown in figure 9 and 10, the ignition key (K) rotates from ignition OFF position to
ignition ON POSITION (i.e. the position at which the ignition starts) the shutter platc (2)
is locked by second locking mcan (8) and second arm (6b) of locking member (6)
engages with the pinion face (3a) of pinion (3) which prevent or restricts the rotation of
pinion (3) against the torsion spring (5) force as shown in figure 9 and 10. 'i'hercfore, in
such condition if users with the help of switch pushes the locking means (7, 8) against
the spring forcc from an external mean (i.e. switch 4 as shown in fig. 4) shutter plate (4)
will not movc and thereby prevent the closing of shutter plate (4) at ON POSI'TION.
IGNITION OFF I'OSITION TO LOCK POSITION (AUTO CLOSING
OF SHUTTER)
As the ignition key rotated from OFF position to LOCK position, the CAM (4) also
rotates from OFF position to LOCK position, the second locking mean (8) is pushed by
lobe (4c) of CAM (4) which energizes the energizing mean (9a), hence the shutter platc
(2) tends to movc to de-energize the torsion spring (5) while the shutter platc (2) is
stopped by the second arm (6b) of locking member (6) through the pinion face (3a).
IIowcvcr, when the ignition key is removed, the second arm (6b) of locking member (6)
moves away from the pinion face (3a) through the pivot (1 a) by torsion spring (1 2) force
, result of which the shutter platc (2) is closed automatically (shown in fig. 3).
OPTIONAL CLOSING OF SHUTTER AT OFF POSITION
At OFI: position shown in fig. 8, the shutter plate (2) is locked by second locking mean
(8) and simultaneously by second end (6b) of the locking member (6) while the ignition
key is inserted in the key hole (1 6).
In case, the ignition key is removed at OFF position from the key hole (16), the
sccond part (4b) of the CAM (4) moves towards the first part (4a) of the CAM (4) which
is energized by a springs, makes the locking member (6) rotates through the pivot (la)
(dc-energized the torsion spring (12)) resulting the second arm (6b) of locking member
(6) moves apart from the transmission mean (3).
Since, at OF17 position the shutter plate (4) is already locked by second locking
mean (8) and ignition key is removed from the keyhole (16), shutter plate (2) can only be
inovcd to close by pushing the second locking mean (8) (energized the energizing mcan
9b) from some external source as shown in fig 4.

Claims:
I . An improved protection device for a vehicle cylinder lock provided with a key
hole and an auto shutter mechanism to cover the said key hole, the said device
comprising:
a mounting body (1) and a cover (lo), the cover (1 0) is co-axially mounted on
the mounting body (I), the said cover (10) consisting a key insertion hole
(15), a key slot (17) and a switch slot (18) to move the switch (1 1) wherein,
the said key insertion hole (1 5) of the cover (10) is aligned with the key hole
(1 6) of the mounting body (I) of cylinder lock;
a shuttcr plate (2) being slidably fixed on the cover plate (13) within thc
guiding tracks (19) on the mounting body (I), thc said shutter plate (2) having
a slot (20) and operationally configured with the transmission mean (3) at the
first longitudinal side (21), the shutter plate (2) is capable of being engage and
disengage with the locking means (7, 8) during the shutter plate (2) opening
and closing operation from the second longitudinal side wall (22), the locking
mcans (7, 8) are disposed in the slots of the mounting body (1) and being
connected with a switch (1 1) ;
a locking member (6) pivotally mounted on the mounting body (1) being
in communication with the transmission mean (3) by a second arm (6b) and
the CAM (4) by a first arm (6a);
the said CAM (4) being centrally placed below the shutter plate (2) and
having two part assembly.
2. The device as claimed in claim 1, wherein the shutter plate (2) having the slot (20)
offset to the ccntral portion of the shutter plate (2) having an open face towards thc
locking mcans (7, 8).
3. The devices as claimcd in claim 1, wherein the shutter plate (2) having teeth on thc
first longitudinal side wall (21) up to a predetermined length that remain in mesh
with the teeth of the transmission mean (3).
4. 'The dcvice as claimed in claim 1, wherein the shutter plate (2) having at least one
slot (2a) on the second longitudinal side wall (22) of the shutter plate (2).
5. 'I'he device as claimed in claim 1, wherein the shutter plate (2) is having
rectangular shape.
6. 'I'he device as claimed in claim 1, wherein the shutter plate (2) reciprocates on the
guiding tracks (19) disposed on the top surface of the cover plate (13) that is
embedded in the mounting body (1) of the cylinder lock.
7. 'I'he device as claimed in claim 1, wherein the shutter plate (2) is located above the
CAM profile.
8. 'I'he device as claimed in claim 1, wherein the cover plate (13) is disposed above
the CAM (4), having a slot (25) co-axially above the key hole ( 16).
9. The device as claimed in claim 1, wherein the locking means (7, 8) resiliently
engaged in the slots provided in the mounting body (1) of cylinder lock and
capable of being push by the CAM (4) and being engaged or disengaged with the
second longitudinal side wall (22) of the shutter plate (2).
10. The device as claimed in claim 1, wherein the locking means (7, 8) are having '1'-
shape structure and provided with a protrusion on the top surface to engage with
the switch (1 1) on the cover (10).
1 1. 'l'he device as claimed in claim 1, wherein the locking member (6) is having Ushape
profile and pivotally mounted, offset from the center.
12. 'The device as claimed in claim 1, wherein the second arm (6b) of the locking
member (6) is in communication with the transmission mean (3) and the first arm
(6a) is in communication with the CAM (4).
13. l'he device as claimed in claim 1, wherein the first part (4a) and the second part
(4b) are disposed in a manner that second part (4b) moves with respect to the first
part (4a) during insertion and withdrawal of the key to energize & de-energize the
springs respectively.
14. 'l'hc dcvice as claimcd in claim 1, the first part (4a) of thc cam (4) consists of a
lobc (4c) which pushcs thc rcsilicntly cnergized locking mcans (7,8) at 0I:I2
I'OSI'I'ION and 1,COK POSI'I'ION respectivcly.
15. 'I'he device as claimed in claim 1, wherein the key hole (16) is covered by the first
part (4a) and the sccond part (4b) of the CAM (4).
16. 'I'hc dcvice as claimcd in claim 1, whercin the transmission mean (3) is mountcd
with a torsion spring (5) and having teeth that remain in mesh with tecth on thc
shuttcr platc (2).
17. 'l'hc dcvice as claimed in claim 1, whcrein the transmission mcan (3) is tcnd to
angularly displaced towards thc second arm(6b) of thc locking mcmber (6), due
to the torsion spring (5) force.
18. 'The dcvice as claimed in claim 1, wherein the transmission mean / (3) having top
surface cxposcd from the cover (10) and being accessible to the uscr.
19. 'l'he device as claimed in claim 1, wherein the top surface of transmission mean (3)
is having a key slot (3b ) in accordance with the shape and configuration with back
part of ignition Key.
20. l'hc device as claimed in claim 1, wherein the shutter plate (2) is opened from
1,OCK position, by placing the back part of key in key slot (3b) and rotating in
clockwisc direction, the shutter platc (2) is being locked by the first locking mcan
(7) at this position to restricts the movement of the shuttcr plate (2) to close
condition (LC. left side).
21. 'I'he dcvicc as claimcd in claim 1, whercin from LOCK position to OFF position of
ignition key, the shutter plate (2) is locked by the second locking mean (8) by
rclcasing thc locking from the first locking mean (7).
22. 'The device as claimed in claim 1, wherein the auto shutter mechanism close the
shutter plate (2) upon rotating the key from OFF position to LOCK position and
withdrawing the same, the auto shutter mechanism involves rotating the CAM (4)
from OFF position to 1,OCK position, the second locking means (8) is pushed by a
lobe (4e) of the CAM (4) that releases the locking of shutter plate (2) by locking
mean (8), and the shutter plate (2) tends to move to de-energize the transmission
mean (3) while the shutter plate (2) is stopped by the second arm (6b) of locking
member (6) of locking member (6) and upon withdrawing of key leads to rotate
the Locking member (6) away from the transmission mean (3) by torsion spring
(5), result of which the shutter plate (2) moves to closed position automatically.