FIELD OF INVENTION
The present invention relates to a protecting device for cylinder lock vehicles. More particularly, the said invention relates to a safety device for a cylinder lock capable of facilitating the automatic closing operation of a shutter for improving the theft prevention effect.
BACKGROUND ART
In general, automobile cylinder locks are locked by means of a key. However, the said locks can be easily tampered to gain access of the vehicle. Vehicle locks are tampered by any burglar by breaking such locks by inserting a wedge shaped tool or screwdriver between the cylinder lock.
Therefore, 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.
There 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 mechanism provides a cylinder lock protection system in which, after a shutter plate for closing a key hole is moved to an open position in response to a magnet lock being unlocked, the shutter plate automatically returns to a closed position in response to
a mechanical key inserted into the key hole being withdrawn, thus enhancing the operability and ensuring that closing the shutter plate is not forgotten.
However, in order to achieve open and close condition the above mentioned mechanism is achieved by utilizing more no. of components which work in tandem making the functioning of the entire assembly 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 cylinder lock assembly is expensive.
It has also been observed in above mentioned protective devices with auto closing feature, in some cases the auto closing mechanism is actuated by performing an extra operation of the key may be additional key push.
Also 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.
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 cylinder lock protection assembly results in user inconvenience.
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.
OBJECTIVES OF THE INVENTION
The primary objective of the present invention is to provide a protective device for vehicle cylinder locks having/an improved assembly and construction which addresses at least some of the disadvantages of the conventional cylinder lock protection assembly.
Another objective of the present invention is to provide a protecting device for cylinder locks having auto return operation of shutter.
Yet another objective of the present invention is to provide an improved protecting device for the cylinder lock having simple design and is user friendly.
Yet another objective of the present invention is to provide an improved protecting device, wherein there is less wear and tear on the key surface.
SUMMARY OF THE INVENTION
Accordingly, the present invention relates to a protective device for a cylinder lock, wherein said cylinder locks having a key hole and being operable using a key (13), said device comprising: a casing comprising a cover member (1) and a case member (2) , wherein the said case member having a cavity (5) which corresponds to said key hole of said cylinder lock and guiding tracks (6) extending in both direction from said cavity (5); a shutter (3) being slidably mounted on said guiding tracks having a slot (902), a rack (901) being formed along one side of said shutter, and a groove being provided in said shutter which forms integral part of said slot; an engagement member (9) along with first energizing means (7) being disposed in the base of said case member and engaging the same to the shutter for maintaining said shutter in an open position; a CAM (500,600) (4) being disposed within said cavity (5) and being provided with a secondary engagement means (602) for engaging the same in the groove of said shutter; and actuated by said key rotation; a rotor (12), having a magnetically actuatable lock means, mounted on said case member (2) and having gear teeth (702) in mesh with said rack gear teeth (901) of said shutter forming a rack and pinion arrangement for sliding motion of said shutter from said closed position to said open position and vice versa.
In the above paragraphs the more important features of the invention has been outlined, in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better understood and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures for carrying out the several purposes of the invention. It is important therefore that the claims be regarded as including such equivalent constructions as do not depart from the spirit and scope of the invention.
BRIEF 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. Reference numerals have been used to refer to identical or similar functionally similar elements. The 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 and key in accordance with an aspect of the present invention;
Fig. 2 illustrates the closed condition of an ignition hole in accordance with an aspect of the present invention;
Fig. 3 illustrates the open condition of the ignition hole in accordance with an aspect of the present invention;
Fig. 4 illustrates the top view of the casing in accordance with an aspect of the present invention;
Fig. 5 illustrates the bottom view of a CAM (500,600) in accordance with an aspect of the present invention;
Fig. 6 illustrates the top view of the CAM (500,600) in accordance with an aspect of the present invention;
Fig. 7 illustrates the top view of a Rotor in accordance with an aspect of the present invention;
Fig. 8 illustrates the bottom view of the Rotor in accordance with an aspect of the present invention;
Fig. 9 illustrates the bottom view of a shutter in accordance with an aspect of the present invention;
Fig. 10 illustrates the top view of the shutter in accordance with an aspect of the present invention;
Fig. 11 illustrates the sectional view of the protective device under the close condition of the shutter in accordance with an aspect of the present invention;
Fig. 12 illustrates the sectional view of the protective device under the open condition of the shutter in accordance with an aspect of the present invention;
Fig. 13 illustrates the sectional view of the protective device when engagement member clears the shutter slot opening and cam projection comes in contact with shutter archive grove in accordance with an aspect of the present invention;
Fig. 14 illustrates a top view of the shutter-CAM-Rotor assembly indicating the position of the CAM under OFF condition of the ignition key and engagement member clearing the shutter slot opening in accordance with an aspect of the present invention;
Fig. 15 illustrates bottom view corresponding to fig 14;
Fig. 16 illustrates a bottom view of the shutter-CAM-Rotor assembly indicating the position of the CAM under closed condition of shutter in accordance with an aspect of the present invention;
Fig. 17 illustrates a top view of the shutter-CAM-Rotor assembly indicating the position of the CAM under LOCK condition of the ignition key and open condition of shutter in accordance with an aspect of the present invention;
Fig. 18 illustrates bottom view of the shutter-CAM-Rotor assembly indicating the position of the CAM under ON condition of the ignition key and open condition of shutter in accordance with an aspect of the present invention;
Fig. 19 illustrates the sectional plane of the magnetic rotor of the cover member in accordance with an aspect of the present invention;
Fig. 20 illustrates sectional view demonstrating the position of magnets in the said rotor without the presence of magnetic key; and
Fig. 20(a) illustrates sectional view demonstrating the position of magnets in the said rotor with the presence of magnetic key.
Skilled artisans will appreciate that 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
Accordingly, the-present invention relates to a protective device for a cylinder lock, wherein said cylinder locks having a key hole and being operable using a key (13), said device comprising: a casing comprising a cover member (1) and a case member (2) , wherein the said case member having a cavity (5) which corresponds to said key hole of said cylinder lock and guiding tracks (6) extending in both direction from said cavity (5); a shutter (3) being slidably mounted on said guiding tracks having a slot (902), a rack (901) being formed along one side of said shutter, and a groove being provided in said shutter which forms integral part of said slot; an engagement member (9) along with first energizing means (7) being disposed in the base of said case member and engaging the same to the shutter for maintaining said shutter in an open position; a CAM (500,600) (4) being disposed within said cavity (5) and being provided with a secondary engagement means (602) for engaging the same in the groove of said shutter; and actuated by said key rotation; a rotor (12), having a magnetically actuatable lock means, mounted on said case member (2) and having gear teeth (702) in mesh with said rack gear teeth (901) of said shutter forming a rack and pinion arrangement for sliding motion of said shutter from said closed position to said open position and vice versa.
In another aspect of the present invention, comprising: a second energizing means (11) for biasing the rotor and shutter gear train towards shutter closing position.
In yet another aspect of the present invention, the said CAM means having a lobe (503,603) which is operationally engaged to the said engagement member (9).
In still another aspect of the present invention, the said cavity is centrally located in the base of the case member.
In a further aspect of the present invention, the said guiding tracks are disposed on the top surface of the said case member.
In a furthermore aspect of the present invention, comprising: a mounting means (403) having plurality of recesses (404) therein for mounting magnetic bodies (16).
In one more aspect of the present invention, comprising: an enclosure (405) having extended walls located adjacent to the cavity.
In another aspect of the present invention, the said slot of shutter (902, 1002) is a through slot having the opening (903,1003) on one side of shutter (900,1000).
In yet another aspect of the present invention, the said first energizing means (7) coupled to said engagement member (9) is being disposed in the said enclosure for biasing the engagement member (9) towards shutter slot opening (903,1003).
In still another aspect of the present invention, the grooves comprises longitudinal (904) and archival (905) grooves.
In a further aspect of the present invention, the said rotor (12) being mounted over the said mounting means (403).
In a furthermore aspect of the present invention, the said cover member (2) comprises at least two apertures.
In one more aspect of the present invention, the said shutter is moved to closed position from the open position automatically when key is withdrawn from the said cylindrical lock.
In another aspect of the present invention, the said ignition key comprises magnetic bodies corresponding/in complement to the magnetic bodies present in the said mounting means.
In yet another aspect of the present invention, the said magnetically actuatable rotor is actuated by repelling the magnetic bodies present in the mounting means with the magnetic bodies of the ignition key.
In still another aspect of the present invention, the said ignition key is being provided with a protrusion for accommodating magnets therein.
In a further aspect of the present invention, the said protrusion is located at the top or any of the side portions of the ignition key.
In a furthermore aspect of the present invention, the two apertures of the said cover member corresponds to the ignition key hole and the magnetically actuable rotor.
In one more another aspect of the present invention, the said magnetically actuatable rotor comprises a slot (701) for inserting the protrusion of the ignition key.
In another aspect of the present invention, the said CAM (500,600) slot is preferably in dumbbell shape.
In yet another aspect of the present invention, the said engagement member (9) along with the spring means (7) being disposed in an enclosure having extended walls located adjacent to the cavity.
In still another aspect of the present invention, the said energizing member is a helical spring.
In a further aspect of the present invention, wherein the said secondary engagement means(602) is engaged to the longitudinal and archival groove of the shutter.
DETAILED DESCRIPTION OF THE FIGURES ALONG WITH WORKING OF THE 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.
The 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.
The 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 the following detailed description of the aspects of the invention, reference is made to the accompanying drawings that form part hereof and in which are shown by way of illustration specific aspects in which the invention may be practiced. The aspects are described in sufficient details to enable those skilled in the art to practice the invention, and it is to be understood that other aspects may be utilized and that charges may be made without departing from the scope of the present invention. The following description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only be the appended claims.
The overall construction of the present invention is initially described with reference to figure 1, wherein figure 1 represents an exploded view of a protecting device (100) for a vehicle cylinder lock, the said device comprises casing having a cover member (1) and a case member (2); a shutter (3), a CAM (500,600) (4) and an engagement member (9).
As herein discussed, the above mentioned components are assembled inside a casing and mounted on a cylindrical body (not shown) of a cylindrical lock (not shown).
Although not shown in figure 1, a cylindrical lock of two wheeled motor vehicle is provided on a vehicle body frame, and top end of the cylindrical body is covered by the said casing.
The said cylinder lock has an inner cylinder, which is pivotally inserted into the cylinder body and in turn the said inner cylinder is provided with a rectangular key hole, which is long in a direction perpendicular to the pivot axis of the inner cylinder and the key hole opens in a central part at the front end of the cylinder lock
The casing comprises cover (1) and case (2) members which are made of non-magnetic material, wherein the said cover member (1) is mounted on the said case member (2) encasing the entire assembly between the said case member and itself.
Now referring to figures 2 and 3, the said figures represent the close and open condition of an insertion hole (201,301) provided in said cover(200,300) corresponding to the key hole of the of the cylinder lock. The said insertion hole is circular in shape. Further, the cover member is provided with a circular opening (202,302) for accommodating the said rotor (12), having a magnetically actuatable lock means.
Further it can be noticed from figure 2 and 3, disposed within the said casing between the case member and the cover member is a shutter which is movable between a closed position wherein the shutter closes the insertion hole and an open position wherein the shutter opens the insertion hole.
Now referring to figure 4, the said figure represents the view of the case member (400) comprising a cavity (401) which corresponds to the insertion hole (201,301) of the cover
member (200,300) and the key hole of the cylinder lock, guiding tracks (402) extending in both direction from the said cavity (401) on the top surface of the said case member (400), a mounting means (403) having plurality of recesses (404) therein for accommodating magnetic bodies (16), an enclosure (405) having extended walls located adjacent to the cavity (401). However, it is to be noted that, it is within the purview of skilled person to select the shape and size of the recesses provided in the said mounting means.
Referring to figures 5 and 6 wherein said figures represent bottom and top view of the said CAM (500,600). The said CAM (500,600) is disposed within the said cavity (401) of the said case member (400) and being provided with a secondary engagement means (602). The said secondary engagement means (602) provided in the CAM (500,600) is engaged with the shutter (3) and controls the auto return function of the shutter (3). There is a slot (601) provided in the said CAM for inserting key in the cylindrical locks. The CAM (500,600) rotates along with the insertion key, when the key is rotated from LOCK position to ON position and vice versa.
The geometry of the slot is preferably a dumbbell type to have some idle rotation of the key. such shape of slot results in compact size of protective device (100).
Further the said CAM (500,600) is provided with a lobe (503,603) on the periphery of the CAM (500,600). The said lobe (503,603) comes in contact with the engagement member (9) disposed in the said enclosure (405) while the CAM (500,600) is rotated. More specifically, while the CAM (500,600) is rotated by the ignition key, the said lobe (503,603) also simultaneously rotates and pushes the engagement member (9) inside the enclosure (405) such that the engagement member (9) is disengaged from the shutter.
Now referring to figure 7, wherein said figure 7 represents a top view of a rotor (700,800) which is magnetically actuable placed over the mounting means (403) of the said case member (400) comprises a slot (701) for inserting a magnetic key (13) and a gear train (702) coupled to the said shutter (3) for actuating motion of the said shutter (3) from a closed position to the open position and vice versa.
The said rotor (700) is mounted over the said mounting means (403) and is in contact with energizing means(l 1). When the rotor (700) is rotated using a magnetic key (13), the energizing means (11) preferably a torsional spring, which is coupled to the said rotor which is also rotated and simultaneously gets energized.
Figure 8, represents the bottom view of the said rotor (800), wherein the bottom portion of the rotor (800) comprises plurality of mating recesses (801) which corresponds to the recesses (404) provided in the said mounting means (403) which consists of magnetic bodies (16) therein.
Now coming to figures 9 and 10, wherein the said figures represent the top and bottom view of the shutter (900,1000). The said shutter (900,1000) is being slide-ably mounted on the said guiding tracks provided on the case member. The said shutter (900,1000) comprises a through slot (902,1002) with an opening (903) on one side of shutter (900,1000), a rack teeth (1001) being formed along one of its side, and a longitudinal (904) and an archival (905) grooves being provide at the bottom of the said shutter (900,1000) which forms an integral part of the through slot (902,1002).
The said secondary engagement means (602) provided in the said CAM (500,600) is engaged to the longitudinal (904) and archival (905) grooves of the shutter (900,1000) wherein the secondary engagement means (602) moves along the longitudinal (904) and archival (905) grooves facilitating opening and closing of the shutter (900,1000).
The gear teeth (702) of the rotor (700) is interlocked with the rack gear teeth (901,1001) of said shutter (900,1000) forming a rack and pinion arrangement for sliding motion of said shutter (900,1000) from said closed position to said open position and vice versa. Accordingly, the said rotor (700,800) is rotated by the said magnet key (13), which results in the linear movement of the shutter (900,1000) from closed position to the open position.
The said shutter (900,1000) is engaged to an engagement member (9) which in turn is disposed in the enclosure (405) provided in the said case member (400). More specifically, the said engagement member (9) is engaged to the opening of the through
slot (902,1002) for maintaining the shutter (900,1000) in an open position. In this regard, referring to figure 1, the said engagement member (9) is disposed in the said enclosure (405) in combination with a energizing means(7) preferably a compression spring which is also referred to as a helical spring. The energizing means (7) pushes the engagement member (9) forward, which in turn gets locked in the opening of the through slot (902,1002) of the shutter (900,1000).
Now we shall explain in detail the complete working of the present invention with reference to figures 11, 12 & 13. Before explaining the working of the present invention, we would like to mention that figure 11 illustrates the sectional view of the protective device under the close condition of the shutter (900,1000), figure 12 illustrates the sectional view of the protective device under the opeh condition of the shutter (900.1000)); and figure 13 illustrates the view of the protective device when engagement merhber (9) clears the shutter slot (902,1002) and the secondary engagement means (602) comes in mesh with shutter archival groove in accordance with an aspect of the present invention.
WORKING OFTHE PRESENT INVENTION
(i) Shutter opening condition:
Once the magnetic key (13) is placed in the magnetic slot (701) provided in the rotor (700) and when the rotor (700) is rotated by the user, the gear (702) of the rotor (700) engaged with the gear train (901,1002) of the shutter (900,1000) moves the shutter (900,1000) to the opening position. To achieve open condition, the shutter (900,1000) moves along the guide tracks provided on the casing. In this condition, the secondary engagement means (602) of the CAM (500,600) remains engaged with the longitudinal channel of the shutter (900,1000). After achieving the open condition, the engagement member gets engaged with an opening of the shutter (903,1003) to maintain the open condition of the shutter (900,1000). Subsequently, when the user inserts the key in the ignition key hole and turns the ignition lock from lock position to ON position, the CAM (500,600) is rotated and in turn the secondary engagement means (602) of the CAM (500,600) gets engaged to the archival groove / channel of the shutter (900,1000) and the
engagement member (9) gets engaged to the opening of the through slot of the shutter. The said secondary engagement means (602 ) does not allow the movement of the shutter.
(ii) Automatic shutter closing Condition:
As regards closing of the shutter (900,1000), once the mechanical key (13) is taken out from the lock or when the ignition lock is brought to lock condition, during this operation the CAM (500,600) is being rotated such that the secondary engagement means(602) of the CAM (500,600) gets disengaged from the archival channel of the shutter (900,1000) and subsequently engages with the longitudinal channel. Further, simultaneously the lobe (503,603) of the CAM (500,600) pushes the engagement member (9) inside the enclosure (405). The above mentioned operation are performed so as to release the shutter (900,1000) from the opening position to the closing position automatically. More precisely, due to the energy accumulated in the energizing means (11), the said energizing means rotates the rotor (700,800) to its original position. The said rotor (700,800) pushes the shutter (900,1000) automatically back to the close position as the said gear teeth (702) of the rotor (700,800) is coupled to the rack gear teeth (901,1002) of the shutter (900,1000) in a rack and pinion assembly.
We shall now explain figures 14 and 15, wherein said figures represent top and bottom view of the shutter-CAM-Rotor assembly which indicates the position of the CAM (500,600) under OFF condition of the ignition key. When the ignition key is turned off and brought to lock condition, the ignition key rotates the CAM (500,600). During this condition, the said locking means secondary engagement means (602) of the CAM (500,600) traverse through the archival grooves towards the longitudinal groove. Simultaneously/the CAM rotates and pushes the engagement member (9) inside the enclosure which in turn releases the shutter (900,1000).
Now referring to figure 16, illustrating bottom view of the shutter-CAM-Rotor assembly which indicates the position of the CAM under LOCK closed condition of shutter . After the secondary engagement means (602) moves towards the longitudinal groove, the shutter (900,1000) is now completely released from the engagement member (9) and
secondly, the obstruction from the secondary engagement means (602) is released. In this condition, the shutter (900,1000) completely slides to the closed position. At this stage, the secondary engagement means (602) of the CAM (500,600) is located at the end of longitudinal groove.
Now let us consider figures 17 and 18 which illustrate top and bottom view of the shutter-CAM-Rotor assembly which indicates the position of the CAM under ON condition.. Once the magnetic key is inserted and the rotor is rotated, the shutter (900,1000) slides to the open position. In this situation, the engagement member (9) gets locked in the opening provided in the through slot disabling the shutter (900,1000) to move to the closed position. Thereafter, the magnetic key is removed and the ignition key inserted to rotate the ignition key from lock position to ON position, during this operation thd ignition key simultaneously rptates the CAM (500,600), wherein the secondary engagement means (602) is rotated along the archival groove (905) and rests at the end of the said longitudinal groove (904).
It can be noticed that constructing the protective device for cylinder lock for vehicles in the aforesaid manner addresses all of the .disadvantages encountered by the prior art protecting device.
Further, the protective device for a cylinder locked as constructed in the aforesaid manner meets with all of the requirements for which the protective device is provided i.e.
(a) it effectively enables auto return operation of shutter (900,1000);
(b) it restricts the tampering of ignition lock by an unauthorized user and thereby preventing theft;
(c) it ensures no direct continuous contact between key and the shutter ensuring no wear and tear on the key surfaces.
Furthermore, the present invention provides at least the following advantages:
a) Less number of Parts
b) Less wear and tear is experienced
c) Smoother operation of opening and closing of the shutter
d) Simple assembly
e) Easy maintenance
f) Cost Effective
The advantages of the disclosed invention are thus attained in an economical, practical, and facile manner. While preferred aspects and example configurations have been shown and described, it is to be understood that various further modifications and additional configurations willbe apparent to those skilled in the art. It is intended that the specific embodiments and configurations herein disclosed are illustrative of the preferred nature and best mode of practicing the invention, and should not be interpreted as limitations on the scope of the invention.

WE CLAIM
1. A protective device for a cylinder lock, wherein said cylinder locks having a key hole
and being operable using a key (13), said device comprising:
a casing comprising a cover member (1) and a case member (2) , wherein the said case member having a cavity (5) which corresponds to said key hole of said cylinder lock and guiding tracks (6) extending in both direction from said cavity (5);
a shutter (3) being slidably mounted on said guiding tracks having a slot (902), a rack (901) being formed along one side of said shutter, and a groove being provided in said shutter which forms integral part of said slot;
an engagement member (9) along with first energizing means (7) being disposed in the base of said case member and engaging the same to the shutter for maintaining said shutter in an open position;
a CAM (500,600) (4) being disposed within, said cavity (5) and being provided with a secondary engagement means (602) for engaging the same in the groove of said shutter; and actuated by said key rotation; and
a rotor (12), having a magnetically actuatable lock means, mounted on said case member (2) and having gear teeth (702) in mesh with said rack"gear teeth (901) of said shutter forming a rack and pinion arrangement for sliding motion of said shutter from said closed position to said open position and vice versa.
2. The protective device as claimed in claim 1, comprising: a second energizing means (11) for biasing the rotor and shutter gear train towards shutter closing position.
3. The protective device as claimed in claim 1, wherein the said CAM means having a lobe (503,603) which is operationally engaged to the said engagement member (9).
4. The protective device as claimed in claim 1, wherein the said cavity is centrally located in the base of the case member.
5. The protective device as claimed in claim 1, wherein the said guiding tracks are disposed on the top surface of the said case member.
6. The protective device as claimed in claim 1, comprising: a mounting means (403) having plurality of recesses (404) therein for mounting magnetic bodies (16).
7. The protective device as claimed in claim 1, comprising: an enclosure (405) having extended walls located adjacent to the cavity.
8. The protective device as claimed in claim 1, wherein the said slot of shutter (902, 1002) is a through slot having the opening (903,1003) on one side of shutter (900,1000).
9. The protective device as claimed in claim 1, wherein the said first energizing means (7) coupled to said engagement member (9) is being disposed in the said enclosure for biasing the engagement member(9) towards shutter slot opening(903,1003).
10. The protective device as claimed in claim 1, wherein the grooves comprises longitudinal (904) and archival (905) grooves.
11 The protective device as claimed in claims 1 & 6, wherein the said rotor (12) being
mounted over the said mounting means (403).
12. The protective device as claimed in claim 1, wherein the said cover member (2) comprises at least two apertures.
13. The protective device as claimed in claim 1, wherein the said shutter is moved to closed position from the open position automatically when key is withdrawn from the said cylindrical lock.
14 The protective device as claimed in claim 1, wherein the said ignition key comprises magnetic bodies corresponding/in complement to the magnetic bodies present in the said mounting means.
15. The protective device as claimed in claim 1, wherein the said magnetically actuatable rotor is actuated by repelling the magnetic bodies presentin the mounting means with the magnetic bodies of the ignition key.
16. The protective device as claimed in claim 1, wherein the said ignition key is being provided with a protrusion for accommodating magnets therein.
17. The protective device as claimed in claim 16, wherein the said protrusion is located at the top or any of the side portions of the ignition key.
18. The protective device as claimed in claim 11, wherein the two apertures of the said
cover member corresponds to the ignition key hole and the magnetically actuable
rotor.
19. The protective device as claimed in claim 1, wherein the said magnetically actuatable
rotor comprises a slot (701) for inserting the protrusion of the ignition key.
20. The protective device as claimed in claim 1, wherein the said CAM (500,600) slot is
preferably in dumbbell shape.
21. The protective device as claimed in claim 1, wherein the said engagement member
(9) along with the energizing means (7) being disposed in an enclosure having
extended walls located adjacent to the cavity.
22. The protective device as claimed in claim 20, wherein the said energizing member is
a helical spring.
23. The protective device as claimed in claims 1 & 10, wherein the said secondary
engagement means(602) is engaged to the longitudinal and archival groove of the
shutter.
24. A protective device for vehicle cylinder locks substantially as herein described with
reference to the accompanying drawings.