Technical Field
The present disclosure relates to a protecting device for cylinder lock vehicles. More
particularly the present disclosure relates to a cylinder lock protection device for a
vehicle with push button mechanism.
Background
In general, vehicles comprise of a cylindrical lock which are used to lock the vehicle by
means of a key. A keyhole is a cavity present in cylindrical lock wherein the key is
inserted and turned to unlock/ lock as per requirement. A keyhole open to the
environment also allows water, dust other foreign particles to enter the keyhole and jam
the cylinder lock. This results in reduction in the life of the cylinder lock. There is often
a requirement to prevent unauthorized access to the key hole of the cylinder lock.
To overcome these drawbacks, solutions have been proposed in the prior art such as
providing a shutter or cover over the cylinder lock when the vehicle is not in use.
In some cases, when the shutter plate automatically returns to a closed position after
removal of mechanical key from cylindrical lock, it strikes with the key continuously
till key is fully withdrawn causing wear of the key. In some another cases a cover is
easily detachable and uses a number lock system. A detachable cover leads to
complications of the cover being misplaced or lost as also the inconvenience of storing
the cover on the vehicle or with the user when the vehicle is in use.
Hence, there exists a strong need to provide an improved protecting device for vehicle
cylinder lock enabling auto return operation of shutter by making the entire assembly
robust and simple, cost effective, user friendly and reduces wear of key.
3
Objectives of Present Disclosure
The primary objective of the present invention is to provide a protective device for
vehicle cylinder locks which addresses to above mentioned problems.
Another objective of the present invention is to provide a protecting device for cylinder
locks having a mechanism which enables movement of shutter from open to close
position.
Yet another objective of the present invention is to provide an improved protecting
device for the cylinder lock having simple design, user friendly and cost effective.
Summary
A protective device (1) for a cylinder lock used for protecting a keyhole of the cylinder
lock comprises of a cover (2) and a case (7). The cover (2) covers the device (1) from
one end and the case (7) positioned to enclose the other end of the device (1). The case
comprises of a cavity (705) which corresponds to a key hole; a cavity (704) for housing
a push button (5) with spring (504); a guiding track (701). A shutter (3) is mounted over
the said guiding track (701) which slides over the keyhole having a gear arrangement
(301) along one of its side. A cylinder shutter (4) which is operated with a magnet key
(8), is mounted on the case (7) which comprises of a cavity (401) on the top to insert the
magnet key (8). A top end of cylinder shutter is having a gear arrangement (402) along
one of its side; an extension arm (403) configured with the top end of the cylinder shutter
(4); the said gear arrangement (402) is in operationally mesh with the gear arrangement
(301) of the said shutter (3) forming a rack and pinion arrangement for sliding the shutter
(3) from an open position to close position and vice versa. A bottom end having cavities
(405)for housing spring loaded magnets (902), an energizing mean (6) connected with
4
the cylinder shutter (4) w.r.t. case (7), energizes and de energizes between open and
closed position; a resiliently energized push button (5) having a top (501), a cavity (503)
at bottom and a protrusion part (502) ,which locks the cylinder shutter (4) in the open
position; unlocks the cylinder shutter to move towards closed position when an external
force is applied on the top part (501) of the said push button (5) .
Brief description of Figures
Figures 1 and 2 illustrates the top and bottom view of the cylinder lock protective in
accordance with an embodiment of the present disclosure.
Figure 3 shows the exploded view of the cylinder lock protective device according to
the embodiment of the present disclosure.
Figure 4 illustrates detailed view of Figure 3 without cover.
Figures5(a) and 5(b)illustrates the perspective and top view of the cover of the cylinder
lock protective device in accordance with the embodiment of the present disclosure.
Figures 6 (a) and 6 (b)illustrates the perspective and front view of the shutter of the
cylinder lock protective device in accordance with the embodiment of the present
disclosure.
Figures 7 (a) and 7 (b)illustrates the top and bottom view of the cylinder shutter of the
cylinder lock protective device in accordance with the embodiment of the present
disclosure.
5
Figure 8 shows the perspective view of the energizing means of the cylinder lock
protective device according to the embodiment of the present disclosure.
Figure 9 illustrates push button cylinder lock protective device in accordance with an
embodiment of the present disclosure.
Figures 10(a)- 10(b) and 11(a)-11(b) illustrates top view and perspective view of the
case of the cylinder lock protective device in accordance with an embodiment of the
present disclosure.
Figure 12 illustrates the magnetic key in accordance with an embodiment of the present
disclosure.
Figure 13 illustrates the cylindrical portion of the cylinder lock protective device in
accordance with an embodiment of the present disclosure
Figure 14(a)-14(b) illustrates the top view of the protective device under the close
condition of the shutter.
Figure 15(a)-15(b) illustrates the top view of the protective device under the open
condition of the shutter
Description of Present Disclosure
While the present disclosure is subject to various modifications and alternative forms,
specific embodiment thereof has been shown by way of example in the figures and will
be described below. It should be understood, however that it is not intended to limit the
present disclosure to the particular forms disclosed, but on the contrary, the present
6
disclosure is to cover all modifications, equivalents, and alternative falling within the
scope of the present disclosure.
It is to be noted that a person skilled in the art can be motivated from the present
disclosure and can perform various modifications. However, such modifications should
be construed within the scope of the present disclosure.
Accordingly, the drawings are showing only those specific details that are pertinent to
understanding the embodiments of the present disclosure 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.
The terms “comprises”, “comprising”, or any other variations thereof, are intended to
cover a non-exclusive inclusion, such that an assembly, setup, system,
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 system or
device or setup. In other words, one or more elements in the system or apparatus or
device proceeded by “comprises a” does not, without more constraints, preclude the
existence of other elements or additional elements in the assembly or system or
apparatus. The following paragraphs explain present disclosure. The invention in
respect of the same may be deduced accordingly.
Accordingly, the main aim of the present disclosure is to provide a protecting device for
cylinder locks having a mechanism which enables movement of shutter from open to
close position.
Another aim of the present disclosure is to reduce wear and tear of the cylinder lock
assembly and provide a smooth operation.
7
Yet another aim of the present disclosure is to reduce number of parts in a protective
device and provide a simple assembly.
Accordingly, the present disclosure provides a protective device (1) for a cylinder lock
used for protecting a keyhole of the cylinder lock comprises of a cover (2) and a case
(7). The cover (2) covers the device (1) from one end and the case (7) positioned to
enclose the other end of the device (1). The case comprises of a cavity (705) which
corresponds to a keyhole; a cavity (704) for housing a push button (5) with spring (504);
a guiding track (701). A shutter (3) is mounted over the said guiding track (701) which
slides over the keyhole having a gear arrangement (301) along one of its side. A cylinder
shutter (4) which is operated with a magnet key (8), mounted on the case (7) comprises
of: a cavity (401) on the top to insert the magnet key (8). A top end of cylinder shutter
is having a gear arrangement (402) along one of its side; an extension arm (403)
configured with the top end of the cylinder shutter (4); the said gear arrangement (402)
is in operationally mesh with the gear arrangement (301) of the said shutter (3) forming
a rack and pinion arrangement for sliding the shutter (3) from an open position to close
position and vice versa. A bottom end having cavities (405) (901) for housing spring
loaded magnets (902), an energizing mean (6) connected with the cylinder shutter (4)
w.r.t. case (7), energizes and de energizes between open and closed position; a
resiliently energized push button (5) having a top (501), a cavity (503) at bottom and a
protrusion part (502) ,which locks the cylinder shutter (4) in the open position; unlocks
the cylinder shutter to move towards closed position when an external force is applied
on the top part (501) of the said push button (5) .
In another embodiment of the present disclosure the cover comprises of at least three
circular cavities.
In yet another embodiment of the present disclosure the three cavities of the cover
correspond to the keyhole, the cylinder shutter (4) and the push button (5).
8
In a further embodiment of the present disclosurethe guiding track (701) are inclined on
the case (7).
In a further embodiment of the present disclosurea cylindrical portion with slots is
positioned on the case for mounting spring loaded magnets therein.
In a further embodiment of the present disclosurethe cylinder shutter is mounted over
the said cylindrical portion.
In an alternate embodiment of the present disclosure the energizing means is a torsion
spring.
In another embodiment of the present disclosure first leg of the said torsion spring is
fixed in the case and the the second leg of the said torsion spring is engaged with the
cylinder shutter.
In an alternate embodiment of the present disclosurethe top part of the push button is
cylindrical in shape.
In one more embodiment of the present disclosurethe protrusion part of the push button
is chamfered at its end which operationally engages/disengages with the extension arm
of the cylinder shutter.
In an alternate embodiment of the present disclosure the bottom part of the push button
is connected with the compression spring.
In a further embodiment of the present disclosure the protective device as claimed in
claim 1, wherein a magnet key is provided with magnets on the side portions of the
ignition key.
In another embodiment of the present disclosurethe magnets are present in the
protrusion of the magnet key corresponds to the magnets present in the slots of cylinder
portion of case.
9
In another embodiment of the present disclosure the cylinder shutter is operated by
repelling the magnets present in the cylinder portion of case due to similar magnet polar
repulsion.
In an alternate embodiment of the present disclosure the protrusion of the magnet key
comprises of a cavity for accommodating the cylindrical protrusion present at the center
of the slot of the cylinder shutter.
In another embodiment of the present disclosure the shutter is moved to closed position
from open position when the push button is pressed by the user and the extension arm
is unlocked as the protrusion part moves downwards.
In another embodiment of the present disclosurethe shutter is moved to open position
from close position when the said cylinder shutter is rotated manually with the magnet
key and at the extension arm is locked with the protrusion part of the push button (5) at
open condition.
In a further embodiment of the present disclosure during the rotation of cylinder shutter
the protrusion part of the push button is depressed by the chamfer at cylinder shutter
and released to lock the cylinder shutter at open condition.
In one more embodiment of the present disclosure two stoppers are disposed on the case
to restrict the rotational movement of the cylinder shutter.
In another embodiment of the present disclosurethe case is provided with at least two
drain slots to drain the water stored in the case of the protective device.
10
The present disclosure deals with protection of a vehicle cylinder lock in which keyhole
is protected with the linear movement of the shutter from open to close position by
providing a push button to operate the movement of shutter. Hereinafter the cylinder
lock protective device is referred as device.
Figures 1 and 2 illustrates the top and bottom view of the cylinder lock protective device
(1). Figure 3 shows the exploded view of the cylinder lock protective device (1)
according to the embodiment of the present disclosure. Figure 4 illustrates detailed view
of figure 3 without cover.
As shown in figure 3 the device comprises of a cover (2), a shutter (3), a cylinder shutter
(4), a push button (5), an energizing mean (6), and a case member (7). The cover (2)
and case member (7) are made of non-magnetic material, wherein the said cover
member (2) is mounted on the said case member (7) encasing the entire assembly
between the said case member (7) and cover (2)
The cover (2), covers the device from one end and has a semicircular shape as shown in
figure 5 (a) and 5 (b). The cover (2) of the device (1) comprises of three circular cavities
first (201), second (202) and third (203) with different diameter.
As illustrated in figures 1, 5 (a) and 5 (b), the second cavity (202) is larger in size and
having a diameter greater than the other two cavities. Third cavity (203) is smallest in
size whereas the size of first cavity (201) lies in between second (202) and third cavity
(203). The first cavity (201) is known as keyhole and it provides an opening for the
insertion of key (8) so to lock/unlock & ignition start/off the vehicle. Second cavity
(202) provides an opening by which the cylinder shutter (4) is rotated by a magnetic key
(8) in clockwise direction. Third cavity (203) is an opening wherein resiliently energized
push button (5) is placed in the device (1) and top part of push button (501) is present
11
above the surface of the cover (2) so that the user can manually operate the push button
(5).
Figures 3, 6 (a) and 6 (b) illustrates the shutter (3) of the device (1). The shutter (3) is
movable between a close position wherein the shutter (3) closes the keyhole and an open
position wherein the shutter (3) opens the keyhole while operating the vehicle. The
shutter (3) is mounted on a guiding track (701) provided on the case member (7) as
shown in figure (10a). As shown in figure 6 (a) and 6 (b) the shutter (3) is having a
trapezoidal shape with gear teeth (301) on the longer edge (302) which acts as a rack of
gear assembly and the moves the shutter (3) linearly and opens/ closes the keyhole.
Figures 3,4,7 (a) and 7(b) illustrates cylinder shutter (4) of the device (1) which is placed
over a cylindrical portion (9). The cylinder shutter (4) is a circular shaped structure
comprising of a slot/cavity (401) for inserting a magnetic key (8) , a gear teeth (402)
coupled with the shutter teeth (301) for actuating motion of the said shutter (3) from
closed position to the open position and an extension arm (403). The gear teeth (402)
of the cylinder shutter (4) is interlocked with the rack gear teeth (301) of the shutter (3)
forming a rack and pinion arrangement for sliding motion of the said shutter (3) from
said closed position to said open position and vice versa. The cylinder shutter (4) is
rotated by the said magnet key (8), which results in the linear movement of the shutter
(3) from closed position to the open position. Figure 7 (a) illustrates isometric view of
the cylinder shutter (4) showing a cylindrical protrusion (404) present at the centre of
the slot/cavity (401) to hold the said magnetic key (8) tightly and enabling the rotation
of the cylinder shutter with respect to the axis of the cylindrical protrusion (404).
Figure 7 (a) also illustrates the extension arm (403) of cylinder shutter which is
rectangular is shape having curved surfaces at the corner. Figure 7 (b) illustrates bottom
view of the cylinder shutter (4) showing four circular cavities (405) present at the bottom
of the cylinder shutter (4). The said cavities (405) hold and covers the spring loaded
12
magnets, which are placed over the cylindrical portion (9) of the device. The cylinder
shutter (4) is provided with a slot (406) to insert one leg of the torsion spring (601) to
operationally energized and de-energized the cylinder shutter. An O-ring (10) is
provided between the cylinder shutter and case to seal the spring loaded magnets.
Figures 4 and 8 illustrates the energizing means (6) of the device (1) and is placed in
between the cylinder shutter (4) and cylindrical portion (9) of the device (1). In an
embodiment of the present disclosure the energizing mean (6) is a torsion spring. The
first leg (601) of the torsion spring is fixed in the case (7) and the second leg (602) of
the torsion spring is engaged with the cylinder shutter (4). When the cylinder shutter (4)
is rotated using the said magnetic key (8), the energizing means (6) is also rotated and
simultaneously gets energized.
Figures 4 and 9 illustrates the resiliently energized push button (5) of the device (1)
which locks the cylinder shutter (4) in open position and unlocks it in the closed position
when push button (5) is pressed. As illustrated in figure 4, the push button (5) is placed
in a cavity (704) present in the case (7) of the device (1). As shown in figure 9, the push
button (5) comprises of a top part (501), a protrusion part (502) and a cavity (503) at
bottom. The top part (501) of the push button (5) is cylindrical in shape and allows user
to manually press the top part (501) of push button which allow the shutter to move in
open position to opens the keyhole for insertion of key in the cylinder lock. As shown
in figure 9 the protrusion part (502) of the push button is chamfered at its end and
engage/ disengages with the extension arm (403) of the cylinder shutter (4) when the
shutter (3) is moving from close to open position. The bottom cavity part (503) of the
pushbutton is inserted with one end spring (504) thus making a resiliently energized
push button. The other end of the spring is fixed with the case (7).
Figures 10(a)-10(b) and 11(a)-11(b) illustrates the case (7) of the device (1). The case
(7) act as a housing for all the components of the device. Figures 10 (a) and 10(b) shows
13
the top and bottom view of the case. Figure 11 (a) and 11(b) illustrates the perspective
view showing top and bottom view of the case (7). Figure 10 (a) and 11 (a) shows the
guiding means (701) of the device (1) over which the shutter (3) is placed and moves
linearly in both the direction. Figure 10 (a) and 11 (a) also shows the cavity (705) of
keyhole which is covered by shutter (3) at the close position and is opened at open
position. The push button cavity (704) is also seen in figure 11 (a) which is positioned
in the case (7). The holes (706,707) in the said push button cavity (704) and at the side
wall are provided in the case to drain water accommodated in the cavity. The case (7)
is provide with a slot (709) to insert one leg of the torsion spring (602). As shown in
figure 10 (a) the stoppers are provided in the case (7) to allow the rotation of the cylinder
shutter in a predetermined angle.
Figure 12 illustrates the different view of magnet key (8) in accordance with the
embodiment of the present disclosure. As shown in figure 12, the magnet key (8) is
having four cavities (802) around its corner (801) which is placed with at least three
magnets (805) of suitable poles. At the center of the magnetic key one more hole (803)
is present which accommodates the cylindrical protrusion (404) present at the center of
the slot/ cavity (403) of the cylinder shutter (4). Figure 12 also illustrates the metallic
portion (804) of the magnetic key (8) which moves inside the keyhole of the cylinder
lock, unlocking/locking the cylinder lock.
Figures 10 (a), 10(b) and figure 13 shows the cylindrical portion (9) of the device (1)
having at least four cavities (901) of equal diameter for housing magnets (902) which
are spring loaded. As shown in figure 13 three magnets (902) are placed in the cavity of
the cylindrical portion (9) and the fourth cavity is vacant. The poles of the magnets (902)
placed on the cylindrical portion (9) are corresponding to the poles of the magnets (805)
present inside the magnetic key (8). During the assembly of the device (1) the spring
loaded magnet (902) partly enters in the holes on inner side of the cylinder shutter (4),
thereby locking the cylinder shutter (4) from rotation. When the magnet key (8) is
14
inserted in the slot/cavity (401) of the cylinder shutter (4), the magnets (805) present in
the magnetic key (8) repel the magnets (902) located on the cylindrical portion (9). The
repulsive force releases the cylinder shutter (4) from the lock, and rotation of the magnet
key (8) will now result in rotation of the cylinder shutter (4).
As shown in Figure-2 and 3 the cover 3 is mounted with the case (7) through three or
more mounting screws (11).
Figures 14(a)-14(b) and 15(a)-15(b) illustrates the closing and the opening position of
the present device in accordance with the embodiment of the present disclosure
respectively.
Working of the Present Disclosure
(i) Shutter Opening:
Figure 14 (a)- (b) illustrates the closed position of the shutter (3). It is the position at
which the key hole is covered by the shutter (3). During the shutter (3) opening
condition, the magnetic key (8) is placed in the slot (401) of the cylinder shutter (4) and
rotated in clockwise direction. The rotational movement of the cylinder shutter (4) is
converted into linear motion of the shutter (3) by rack and pinion gear assembly (301;
402). As the cylinder shutter (4) is rotated in clockwise direction, it energizes the
energizing means (6) i.e. torsion spring. During the rotation of the cylinder shutter (4)
the extension arm (403) of cylinder shutter (4) pushes the protrusion part (502) of push
button (5) downwards. The spring (504) which is positioned beneath the push button
moves the push button (5) upward again, thereby locking the extension arm (403) of the
cylinder shutter (4) with the protrusion part (502) of the push button (5). When the
rotation is completed, the shutter (3) is in open position allowing access to the keyhole
as illustrated in figure 15 (a)-(b). A stopper (703) is present to restrict the rotational
15
movement of the cylinder shutter (4). The stopper (703) is positioned away from the
extension arm (403) and near to pinion (402) of the cylinder shutter (4).
(ii) Shutter Closing:
Figures 15 (a)-(b) illustrates the open position of the shutter (3) . During the closing
condition of the shutter (3), the user manually pushes the top part (501) of push button
downwards. Due to the downward movement of push button, protrusion part (502) of
push button also moves downwards and releases the extension arm (403). As the
extension arm (403) is released, the cylinder shutter (4) also rotates in anti-clock
direction due to resilient operation of the torsion spring and thus brings it in de energize
position, thereby moving the shutter (3) in closed position. A stopper (702) is placed to
restrict the rotational movement of the extended arm (403) of the cylinder shutter (4).
The stopper is positioned near to the extension arm (403) and away from the pinion
(402) of the cylinder shutter (4).
16
Equivalents:
The embodiments herein and the various features and advantageous details thereof are
explained with reference to the non-limiting embodiments in the description.
Descriptions of well-known components and processing techniques are omitted so as to
not unnecessarily obscure the embodiments herein. The examples used herein are
intended merely to facilitate an understanding of ways in which the embodiments herein
may be practiced and to further enable those of skill in the art to practice the
embodiments herein. Accordingly, the examples should not be construed as limiting the
scope of the embodiments herein.
The foregoing description of the specific embodiments will so fully reveal the general
nature of the embodiments herein that others can, by applying current knowledge,
readily modify and/or adapt for various applications such specific embodiments without
departing from the generic concept, and, therefore, such adaptations and modifications
should and are intended to be comprehended within the meaning and range of
equivalents of the disclosed embodiments. It is to be understood that the phraseology or
terminology employed herein is for the purpose of description and not of limitation.
Therefore, while the embodiments herein have been described in terms of preferred
embodiments, those skilled in the art will recognize that the embodiments herein can be
practiced with modification within the spirit and scope of the embodiments as described
herein.
Throughout this specification the word “comprise”, or variations such as “comprises”
or “comprising”, will be understood to imply the inclusion of a stated element, integer
or step, or group of elements, integers or steps, but not the exclusion of any other
element, integer or step, or group of elements, integers or steps.
17
The use of the expression “at least” or “at least one” suggests the use of one or more
elements or ingredients or quantities, as the use may be in the embodiment of the
disclosure to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles and the like that has been
included in this specification is solely for the purpose of providing a context for the
disclosure. It is not to be taken as an admission that any or all of these matters form a
part of the prior art base or were common general knowledge in the field relevant to the
disclosure as it existed anywhere before the priority date of this application.
The numerical values mentioned for the various physical parameters, dimensions or
quantities are only approximations and it is envisaged that the values higher/lower than
the numerical values assigned to the parameters, dimensions or quantities fall within the
scope of the disclosure, unless there is a statement in the specification specific to the
contrary.
While considerable emphasis has been placed herein on the particular features of this
disclosure, it will be appreciated that various modifications can be made, and that many
changes can be made in the preferred embodiments without departing from the
principles of the disclosure. These and other modifications in the nature of the disclosure
or the preferred embodiments will be apparent to those skilled in the art from the
disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive
matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

We Claim: -
1. A protective device (1) for a cylinder lock used for protecting a keyhole of the
cylinder lock comprises:
- a cover (2) and a case (7) wherein,
- the cover (2) covers the device (1) from one end;
- the case (7) positioned to enclose the other end of the device (1) and
comprises of:
- a cavity (705) which corresponds to a keyhole,
- a cavity (704) for housing a push button (5),
- a guiding track (701)
- a shutter (3) mounted over the said guiding track (701) which slides over the keyhole
having a gear arrangement (301) along one of its side;
-a cylinder shutter (4) which is operated with a magnet key (8), mounted on the case (7)
comprises of:
- a cavity (401) on the top to insert the magnet key (8)
- a top end having a gear arrangement (402) along one of its side;
- an extension arm (403) configured with the top end of the cylinder shutter
(4);
- the said gear arrangement (402) is in mesh with the gear arrangement (301)
of the said shutter (3) forming a rack and pinion arrangement for sliding the
shutter (3) from an open position to close position and vice versa;
- a bottom end (404) having cavities (901) for housing spring loaded magnets
(902),
- an energizing mean (6) connected with the cylinder shutter (4), energizes
and de energizes between open and closed position;
19
-a resiliently energized push button (5) having a top (501), a bottom (503) and a
protrusion part (502), which locks the cylinder shutter (4) in the open position; unlocks
the cylinder shutter to move towards closed position when an external force is applied
on the top part (501) of the said push button (5) .
- an O-ring (10) provided between the cylinder shutter and case to seal the spring loaded
magnets.
2. The protective device (1) as claimed in claim 1, wherein the said cover (2) comprises
of at least three circular cavities (201;202;203).
3. The protective device (1) as claimed in claim 1, wherein the three cavities of the said
cover correspond to the keyhole, the cylinder shutter (4) and the push button (5).
4. The protective device (1) as claimed in claim 1, wherein the said guiding track (701)
are inclined on the case (7).
5. The protective device (1) as claimed in claim 1, wherein a cylindrical portion (9)
with slots is positioned on the case (7) for mounting spring loaded magnets (902)
therein.
6. The protective device (1) as claimed in claim 1, wherein the cylinder shutter (4) is
mounted over the said cylindrical portion (9).
7. The protective device (1) as claimed in claim 1, wherein the energizing means (6) is
a torsion spring.
8. The protective device (1) as claimed in claim 1 wherein the case (7) is provide with
a slot (709) to insert one leg of the torsion spring (602).
20
9. The protective device (1) as claimed in claim 1, wherein first leg (601) of the said
torsion spring is fixed in the case (7) and the the second leg (602) of the said torsion
spring is engaged with the cylinder shutter (4).
10. The protective device (1) as claimed in claim 1, wherein the top part (501) of the
push button (5) is cylindrical in shape.
11. The protective device (1) as claimed in claim 1, wherein the protrusion part (502)
of the push button (5) is chamfered at its end which operationally engages/disengages
with the extension arm (403) of the cylinder shutter (4).
12. The protective device (1) as claimed in claim 1, wherein the bottom part (503) of
the push button is connected with the compression spring (504).
13. The protective device (1) as claimed in claim 1, wherein a magnet key (8) is provided
with magnets (805) on the side portions (801) of the ignition key (8).
14. The protective device (1) as claimed in claim 1, wherein the magnets (805) present
in the protrusion (802) of the magnet key (8) corresponds to the magnets (902) present
in the slots of cylinder portion (9) of case (7).
15. The protective device (1) as claimed in claim1, wherein the said cylinder shutter (4)
is operated by repelling the magnets(902) present in the cylinder portion (9) of case due
to similar magnet polar repulsion.
16. The protective device (1) as claimed in claim 1, wherein the protrusion of the magnet
key comprises of a cavity (803) for accommodating the cylindrical protrusion (404)
present at the center of the slot (401) of the cylinder shutter (4).
17. The protective device (1) as claimed in claim1, wherein the said shutter (3) is moved
to closed position from open position when the said push button (5 is pressed by the
user and the extension arm (403) is unlocked as the protrusion part (502) moves
downwards.
21
18. The protective device (1) as claimed in claim1, wherein the said shutter (3) is moved
to open position from close position when the said cylinder shutter (4) is rotated
manually with the magnet key (8) and at the extension arm (403) is locked with the
protrusion part (502) of the push button (5) at open condition.
19. The protective device (1) as claimed in claim1, wherein during the rotation of
cylinder shutter (4) the protrusion part (402) of the push button (5) is depressed by the
chamfer at cylinder shutter and released to lock the cylinder shutter (4) at open
condition.
20. The protective device (1) as claimed in claim1, wherein two stoppers (702;703) are
disposed on the case (7) to restrict the rotational movement of the cylinder shutter (4) .
21. The protective device (1) as claimed in claim1, the case is provided with at least two
drain slots to drain the water.