DESC:Field of the Present Invention:
The present invention relates to a protective device for cylinder lock in vehicles.

Background of the Invention:
The cylinder locks are commonly employed in industry. Generally most of the vehicles are provided with cylinder lock. Such locks are being opened by insertion of key in the provided key hole. For example ignition lock of a vehicle is provided to prevent from unauthorized access to the keyhole.
In case of two or three wheelers vehicles and open roof four-wheeler vehicles, when key is removed from the lock, the lock is open to environment which may cause many problems such as miscreants/thieves may insert any sharp metallic object to unlock the cylinder lock. Further as the lock is completely open to environment, therefore, dirt, water or other foreign particles etc. may damage the lock or may jam the said lock. Eventually, such conditions cause the reduction in the life of lock.
However, to overcome these shortcomings, various solutions have been provided such as to cover the cylinder lock with the help of a shutter. Indian patent 251905 provides such a protecting device to protect the cylinder lock with embedded magnet system which is spring loaded on the base of the protecting device. Such a mechanism has number of various parts as well as complex assembling of such part. This system has centralized positioned recess for receiving magnet key. The key hole is provided at an offsite location to the central axis of the device and adjacent to the said recess. Such arrangement involves specific offset arrangement for other relative components which leads to complexity in assembling of the parts.
Further, since the key hole is offset such type of protective device cannot be put on all vehicles as certain vehicles require key hole to be in the center of protective device.

Objects of the Present Invention:
The main object of the present invention is to overcome at least one of the above mentioned shortcomings.
Another object of the invention is to provide a protecting device for cylinder lock in vehicles.
Still another object of the invention is to provide a protecting device for cylinder lock which is easy to operate and user friendly.

Summary of the Present Invention:
The present invention relates to provide a protecting device for cylinder lock in vehicles. The said protecting device comprises a cap (100), a shutter (200) and a mounting body (300). The mounting body comprises a pivot (302), construction (311) for magnet (314), a stopper pin (310), at least a detent ball (305), resilience means (304) etc. The shutter (200) is pivotally mounted on the pivot (302) of the mounting body (300). The shutter (200) is operationally configured with either inner peripheral side of the cap or top inner surface of the cap, up to predetermined length, so as to achieve tandem motion between the cap and shutter to either uncover or cover the key insertion hole (401) of cylinder lock while rotating the cap. The mounting body (300) is being covered by the cap (100) which is placed co-axially to the mounting body (300). The inner peripheral surface of the cap (100) is provided with gear teeth (104) in line with gear teeth (201) of the shutter. The gear teeth (201) of the shutter (200) mesh with gear teeth (104) of cap (100). As the cap rotates, the shutter (200) also moves pivotally. The cap (100) and the shutter rotate on the mounting body (300) relative to each other in order to achieve tandem motion. The shutter is provided with a shutter pin according to second embodiment of the present invention. The said shutter pin (221) is being accommodated in a slot (108) provided in inner top surface of the cap. In this way the cap is operationally configured with the cap so as to achieve a relative motion between them. As the cap rotates in a direction, the shutter pin travel in the said slot (108) which consequently result in the movement of the covering portion from or towards the key insertion hole (401) of the cylinder lock. The said slot (108) accommodated the travel of shutter pin during the rotation of the cap in a predetermined manner. The mounting body (300) is provided with the stopper pin (310) and the cap is provided with two stopper walls (105a, 105b) so as to limit the rotation of the cap (100) with respect to mounting body (300). When the shutter (200) is in open position, the key insertion hole (401) of cylinder is open and the user can insert the key therein so as to unlock the cylinder lock. When the key is not lying in the keyhole (401) or being pulled out from the keyhole (401), the covering portion C of the shutter (200) covers the key insertion hole (401) cylinder lock.

Brief Description of the Drawings:
Further aspects and advantages of the present invention will be readily understood from the following detailed description with reference to the accompanying figures. The figures together with a detailed description below, are incorporated in and form part of the specification, and serve to further illustrate the embodiments and explain various principles and advantages, in accordance with the present invention wherein:

Figure 1 shows an exploded view of the protecting device according to first aspect of the present invention.
Figure 2 shows a sectional view of the protecting device according to an aspect of the present invention.
Figure 3 shows a section view of the protecting device in closed position according to first aspect of the present invention.
Figure 4 shows a section view of the protecting device in open position according to first aspect of the present invention.
Figure 5 shows the protecting device in closed and open position where the shutter cover-uncover the key hole of cylinder lock according to an aspect of the present invention.
Figure 6 shows the shutter of the protecting device according to first aspect of the present invention.
Figures 7-9 show sectional views depicting various parts of the protecting device according to an aspect of the present invention.
Figure 10 shows an exploded view of the protecting device according to second aspect of the present invention.
Figure 11 shows a section view of the protecting device in closed position according to second aspect of the present invention.
Figure 12 shows a view of the protecting device in open position according to second aspect of the present invention.
Figure 13 shows the shutter depicting the shutter pin according to second aspect of the present invention.

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 embodiments of the present invention.

Detail Description of the Present Invention:
While the invention is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the figures 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.

Before describing in detail embodiments it may be observed that the novelty and inventive step that are in accordance with the present invention resides in protective device for cylinder lock in vehicles. It is to be noted that a person skilled in the art can be motivated from the present invention and modify the various constructions of assembly, which are varying from vehicle to vehicle. However, such modification should be construed within the scope and spirit of the invention. Accordingly, the drawings are showing only those specific details that are pertinent to understanding the embodiments 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.
Accordingly a protective device for cylinder lock in vehicle comprises a mounting body (300) and a cap, the cap is co-axially mounted on the mounting body (300) and rotatable, the said cap (100) consisting a centrally placed magnet key receiving recess (102) and a key insertion hole (101), the said key insertion hole (101) of cap is aligned with the key insertion hole (401) of the cylinder lock, a shutter (200) being adapted between the said mounting body (300) and the cap (100) and at the same time the said shutter operationally configured with either inner peripheral side of the cap or top inner surface of the cap, up to predetermined length, so as to achieve tandem motion between the cap and shutter to either uncover or cover the key insertion hole (401) of cylinder lock while rotating the cap.
In one aspect of the present invention, the shutter has an irregular profile consisting of a first end E1 with gear teeth (201) and a second end E2 having covering portion C to cover key insertion hole (401) of cylinder lock.
One more aspect of the present invention, the cap has gear teeth G at inner surface of side wall (103) that remain in mesh with gear teeth (201) of the shutter.

Another aspect of the present invention, the shutter having optionally a protruding portion (i.e. a shutter pin (221)) perpendicular to the plane that accommodate in a slot (108) of the top inner surface of the cap, so as to achieve relative motion between the cap and shutter to either uncover or cover the key insertion hole (401) of cylinder lock while rotating the cap.

Still another aspect of the present invention, the mounting body comprises a stopper pin (310) perpendicular to the plane of mounting body (300).

Yet Another aspect of the present invention, the cap comprises at the inner side wall (103) at least two protruded portions (105a, 105b) extended towards center of cap, and the stopper pin of the mounting body remain in the available space between the protrusions, thereby limit the rotation of cap up to a pre-determined distance.

Further aspect of the present invention, the mounting body (300) has constructions to accommodate plurality of magnet (307) in line with the magnet key receiving recess (102).

Furthermore aspect of the present invention, the said constructions is in form of circular boundary surface around the key insertion hole (401) of the cylinder lock.

Another aspect of the present invention, the shutter is pivotally mounted on a pivot (302) on the mounting body (300).

Still another aspect of the present invention, the pivot is located adjacent to the key insertion hole (401) of the cylinder lock.
The present invention provides a protective device for cylinder lock in vehicle. Referring to figures 1-13, which show various parts of the protective device for cylinder lock in vehicle according to the present invention and views thereof, it can be observed that the same comprises:
Cap – 100;
Key insertion hole of cap – 101;
Magnet key receiving recess – 102;
Side wall – 103;
Gear teeth in cap – 104;
Stopper wall – 105;
Detent slot – 106;
Top surface of the cap – 107;
Slot for shutter pin – 108;
Recess to engage magnets – 109;
Shutter – 200;
Gear teeth in shutter – 201;
Outwards radial surface – 202a;
First inclined curved surface – 202b;
Second inclined curved surface – 202c;
Perpendicular/side curved surface – 203;
Peripheral region – 204;
First leg of ‘v’ shape profile – 205a;
Second leg of ‘v’ shape profile – 205b;
Apex of ‘v’ shape profile – 206;
Inward radial surface – 207;
Inclined surface – 208;
Hole in shutter – 209;
Surface of shutter – 219;
Smooth curvature at first end of shutter – 220;
Shutter pin – 221;
First end of gear teeth in shutter – T1;
Second end of gear teeth in shutter – T2;
Covering profile – C;
First end of shutter – E1;
Second end of shutter – E2;
Mounting body – 300;
Base – 301;
Pivot – 302;
Cavity to accommodate the resilience means – 303;
Resilience means – 304;
Detent ball – 305;
Aperture – 306;
Magnet locks – 307;
Boundary surface of aperture – 308;
Cylindrical portion – 309;
Stopper pin – 310;
Construction around the aperture – 311;
Step provided on the construction portion – 312;
Cavity in construction – 313;
Magnets – 314;
Springs for magnets – 315;
Recess for entry of shutter on construction – 316;
Cylinder lock – 400;
Key insertion hole of cylinder lock – 401;

Accordingly the present invention relates to protective device for cylinder lock for a vehicle. The said protecting device comprises cap (100), shutter (200), mounting body (300), cylinder lock (400) etc. as shown in figures 1-13. The various parts of the said protective device are described in detail herebelow along with the working or mechanism of the protective device of the present invention.

Mounting body:
Referring to figures 1, the mounting body comprises a base (301) and a cylindrical portion (309). The base is preferably of circular shape. The base has an aperture (306) located co-axially with said the cylindrical portion (309). Preferably, the central axes of the cylindrical portion as well as the aperture are also coincident with the axis of the said base. More particularly, the aperture and the cylindrical portion are located at the center of the base. The cylindrical portion (309) having the aperture (306) at one end forms a receptacle for receiving cylinder lock (400). A construction (311) is provided surrounding said aperture which is protruded from the surface of the base. The said construction (311) comprises plurality of receptacle (313) on its surface (308) so as to accommodate magnet (314) therein as shown in figures 1 and 8 according to an embodiment of the present invention. The said receptacles for magnet locks are located in line with the magnet key receiving recess (102) provided on the cap, as the magnet rests in the said magnet key receiving recess (102) to unlock the magnet lock as shown in figure 9. The magnets (314) are mounted in the said cavity (313) along with spring (315) for magnets as shown in figure 8. The construction potion (311) is provided with a recess (316) so as to facilitate the passage for entry of covering portion C of the shutter (200) so as to slid towards the key insertion hole (401) of the cylinder lock. Due to this passage, the shutter movement can be carried out without interrupting the nearby components which are mounted in surrounding on the key insertion hole (401) of cylinder lock such as magnets (314).

The construction portion (311) further comprises a step (312) at its outer surface as shown in figure 1.The said step (312) is being provided to accommodates the sealing media with cap (100). A pivot (302) is provided at a predefined location in proximity to the said key insertion hole (401) of the cylinder lock according to an embodiment of the present invention. The said pivot is perpendicular to the plane. A stopper pin (310) is provided on the surface of the base (301) of the mounting body. The stopper pin (310) can be of any shape such as circular or non-circular. The stopper pin (310) is perpendicular to plane of the base. The said stopper lies in the available space between the stopper walls (105a, 105b) of the cap provided on the cap (100). The said stopper pin engages with either of stopper wall (105a, 105b) during the operation of the protective device as described hereafter. The stopper pin functions to limit the rotation of the cap (100). The mounting body (300) has one or more cavity (303) at predefined locations so as to accommodate resilience means (304) followed by a detent ball (305) therein. The resilience means is preferably a spring. The detent ball comes in contact with the top inner surface of the cap (100). The spring (304) placed beneath the detent ball (305) helps in maintaining the contact between the detent ball and the cap during the operation. At the same time this combination of spring and detent ball produces a pleasant sound at open and close position.

Structure of shutter:
Referring to figures 1 and 3-4, the shutter (200) is sandwiched between the cap (100) and the base (301) of the mounting body (300) according to an embodiment of the present invention. The shutter is pivotally mounted on the pivot (302) provided on the base of the mounting body. As shown in figure 6, the shutter has an irregular profile. The shutter is made of a predetermined thickness. A hole (209) is provided in the shutter (200) so as to accommodate the pivot (302) for mounting of the shutter on the base (301). The shutter is placed in such a way that its one surface i.e. upper surface faces the top inner surface of the cap while the other surface i.e. lower surface faces the base of the mounting body.

Referring to figure 6, the irregular profile of the shutter (200) comprises various curvature portions. The shutter has a first end E1 and a second end E2. On first end E1, the gear teeth (201) are provided in form of an arc according to first embodiment of the present invention. The said gear teeth are provided up to a predetermined distance which is equal to the arch length T. The said gear teeth (201) are connected to the second end E2 of the shutter by way of variety of curves which forms a continuous curve eventually.

Referring to figure 6, the said continuous curve can be explained with the help of a reference axis X. The continuous curve comprises an outward radial portion (202a). The said outward radial portion is connected to first end T1 of the gear teeth (201). The other end of the outward radial portion is connected to a first inclined curved surface (202b). A second inclined curved surface (202c) is connected with the first inclined curved surface via a side curved surface (203) which is perpendicular the said reference axis X. On second end of the shutter E2, a peripheral region (204) is joined with the second curved surface from one side. The other side of peripheral region is joined with a ‘v’ shape profile. A first leg (205a) ‘v’ shape profile connected with the peripheral region. The other end of the first leg (205a) is connected with second leg (205b) of the ‘v’ shape profile by forming an apex (206). The other end of the second leg (205b) of ‘v’ shape profile is connected with an inward radial curve (207). The inward radial curve (207) is joined with the second end T2 of the gear teeth (201) via an inclined surface (208). The hole (209) is provided in the shutter in such a way that the inward radial curve (207) encompasses a portion of outer circumference of the said hole as shown in figure 6. The peripheral region (204) and second inclined curved surface (202c) jointly form an almost circular portion C. This portion functions as a covering portion C for covering the aperture (306) in the base so as to cover the key insertion hole (401) of the cylinder lock (400).

Cap:
Referring to figures 1-4, the cap (100) is provided to encapsulate the mounting body (300). The cap is operationally configured with the shutter. The cap (100) is of circular shape having predefined diameter so as to encapsulate the mounting body co-axially. The cap (100) comprises a circular portion (107) or top surface and extended circumferential surface so as to form side wall (103) of the cap. The cap (100) is provided with a key insertion hole (101) is aligned with the key insertion hole (401) of the cylinder lock. The cap comprises a magnet key receiving recess (102) on the top surface (107) of the cap. The inner peripheral surface of the cap or inner surface of the side wall (103) of the cap (100) comprises gear teeth (104) according to first embodiment of the present invention. The said gear teeth (104) are provided on a predetermined circumferential distance G on the cap. The gear teeth (104) of cap are provided in line with the gear teeth (201) of the shutter (200) or vice versa. The gear teeth (104) of cap (100) remain meshes with the gear teeth (201) of the shutter. The gear teeth (104) are provided on inner peripheral surface of the cap forms an arc structure. The said arc structure has a first end G1 and a second end G2.

The cap (100) comprises one or more detent slots (106) of predetermined dimension on the top inner surface as shown in figures 2 and 7. The said detent slot (106) is being provided to accommodate the detent ball at the open-close position of the cap. The said cap further comprises two stopper walls, a first stopper wall (105a) and a second stopper wall (105b) on inner peripheral surface of the side wall (103) at predetermined location. The stopper walls are extended toward the center of the cap. The said stopper walls engage with the stopper pin (310) and limit the rotation of the cap after a predetermined degree of rotation. The said cap has step structure on its top surface. The said step enables the user to rotate the cap manually. The said cap (100) is provided with two or more recess (109) to accommodate resiliently energized magnets (314) to magnet lock (307).

Working:
Stage I: Closed position.
The cap (100) is rotatably placed on the mounting body (300). The cap is able to rotate in clock-wise or anti-clock wise direction. The mounting body is fixed. However, the said cap is not able to rotate when the cap is locked with the help of magnet (307) provided on the mounting body (300). In this situation the protective device is in closed position. In other words, in this situation, the shutter (200) is completely covering the key insertion hole (401) of the cylinder lock as shown in figures 3 and 5a. At closed position, the covering portion C of the shutter covers the aperture of the mounting body and hence the key insertion hole (401) of the cylinder lock is also covered. As shown in figure 3, at closed position, the second end T2 of gear teeth (201) of the shutter meshes with the second end G2 of the gear teeth (104) of the cap (100) while the first end G1 of the gear teeth (104) of cap and the first end T1 of gear teeth (201) of shutter are not in contact with each other. At the same time, the second stopper wall (105b) of the cap is engages with the stopper pin (310). In the closed position, the said detent slot (106) in the cap accommodates the resiliently energized detent balls (305).

Stage II: Intermediate position.
In order to insert the key in key insertion hole (401) of cylinder lock to unlock the cylinder lock (400), the user needs to uncover the key insertion hole (401) first, through the magnet key (MK). Referring to figure 9, when a magnet key (MK) is being inserted in the magnet key receiving recess (102) of the cap, the magnet lock (307) unlocks due to magnetic repulsion as shown in figure 9. Consequently the cap (100) is able to rotate in first direction. To uncover the key insertion hole (401), the user needs to rotate the cap (100) in first direction. This movement of the cap causes the shutter (200) to move pivotally as the gear teeth (201) of the shutter are operably engaged with the gear teeth G of the cap (100). Consequently the shutter moves relatively in first direction according to the first embodiment of the present invention. As a result of movement of shutter, the covering portion C slides in the slot (306) provided on the construction (311) and moves away from the aperture (306) so as to uncover the key insertion hole (401) of cylinder lock. During the this operation of uncovering the key insertion hole (401) of the cylinder lock, as the cap rotates in first direction, the second end G2 of gear teeth (104) of the cap and the second end T1 of gear teeth of shutter moves away from each other. Whereas the first end G1 of the gear teeth of the cap and the first end T1 of the gear teeth of the shutter comes closer to each other. Simultaneously, the second stopper wall (105b) of the cap moves away from the stopper (310) while the first stopper wall (105a) comes closer to the stopper (310). During this stage, the detent ball (305) comes out from the detent slots (106) provided in the cap (100) and rolls on the top inner surface of the cap (100). This facilitates a smooth rotational operation of the cap.

Stage III: Open position.
As explained above, after a predetermined degree of rotation of cap (100) the first stopper wall (105a) contacts with the stopper (310). This is an open position in which the covering portion C of the shutter is completely slide away from the aperture (306) so as to uncover the key insertion hole (401) of the cylinder lock. As shown in figure 4, in the open position, the first end T1 of gear teeth (201) of the shutter meshes with the first end G1 of gear teeth (104) of cap (100) while the second end G2 of gear teeth (104) of cap (100) and the second end T2 gear teeth (201) of shutter are not in contact with each other. At the same time, the first stopper wall (105b) of the cap is in contact with the stopper pin (310). In open position, the said detent slot (106) in the cap accommodates the resiliently energized detent balls.

Stage IV: From open position to close position:
In order to cover the key insertion hole (401) of cylinder lock (400), it is required to achieve the situation of the closed position as described in Stage I. For this, the cap (100) is required to rotate in second direction which is the direction opposite to the first direction. As the cap rotates in second direction, the shutter (200) moves relatively in second direction. Consequently, the covering portion C of the shutter slides towards the aperture (306) so as to cover the key insertion hole (401) of cylinder lock. Simultaneously, the first stopper wall (105a) moves away from the stopper pin (310) while the second stopper wall (105b) moves closer to the stopper. During this operation of covering the key insertion hole (401) of cylinder lock, as the cap rotates in second direction, the first end G1 of gear teeth of cap and the first end T1 of gear teeth of shutter moves away from each other. Whereas the second end G2 of gear teeth of cap and the second end T2 of gear teeth of shutter comes closer to each other and hence covers the key insertion hole (400) of cylinder lock at close position.

When the key is being pulled out from the key insertion hole (401) of cylinder lock or if the key in not inserted into the keyhole, the shutter (200) is closed so as to protect the keyhole from dirt, water and other foreign contaminants. Also the protective device provides safeguard from the insertion of other metallic or sharp mean which being used by thieves or unauthorized user to unlock the cylinder lock.

Referring to figure 10, the shutter is provided with a shutter pin (221) according to second embodiment of the present invention. The shutter pin (221) is perpendicular to the plane and is provided at a predetermined location on the upper surface of shutter. The said surface of shutter is facing towards the top inner surface of the cap. As shown in figures 10-13, the shutter is provided with a smooth curvature (220) at its first end E1 according to the second embodiment of the present invention. The rest of the structure of the shutter (200) is a continuous curve and similar to the structure of shutter (200) as described above with respect to the figure 6.

Referring to figure 11-12, the cap is provided with a slot (108) to accommodate the shutter pin according to second embodiment of the present invention. The said slot (108) is located at a predetermined location on the inner surface of the cap (100). The slot (108) is made of a predetermined shape as shown in figures 11 and 12. The slot accommodates the travel of the shutter pin (221) during the rotation of the cap. In such type arrangements, the shutter pin (221) of shutter and the slot (108) of the cap functions as transmission means where transmission takes place due to linkage transmission between the shutter pin and the slot (108) in the cap. As the cap rotates, the shape of slot (108) allows the shutter pin (221) to travel along the surface of the slot in predetermined direction. This travel of shutter pin causes the shutter to move pivotally. Similar to above described positions, as the cap rotates in first direction, the shutter pin of the shutter travels in slot of the cap which causes a pivotal movement of the shutter (200) in relatively first direction. During this operation, the covering portion C of the shutter slides or moves away from the key insertion hole (401) of cylinder lock (400). After the movement of the cap up to a predetermined degree of rotation, the first stopper wall (105a) of the cap (100) comes in contact with the stopper pin (310) so as to limit the further rotation of the cap as shown in figure 12. This is open position of the protective device when shutter is not covering the key insertion hole (401) cylinder lock.

In order to achieve the closed position, the shutter of the protecting device is required to cover the key insertion hole (401) of cylinder lock. For closing the key insertion hole (401) of cylinder lock, the cap (100) rotates in second direction which causes the shutter pin (221) to travel in predetermined direction along the surface of the slot profile. This travel of shutter pin (221) causes the shutter to move pivotally. Similar to above described positions, as the cap rotates in second direction which is opposite to its first direction, the pin of the shutter travels in predetermined direction which causes a pivotal movement of the shutter relatively in second direction i.e. opposite to its first direction. During this operation, the covering portion C of the shutter moves towards the key insertion hole (401) of cylinder lock so as to cover the same. After the movement of the cap up to a predetermined degree of rotation, the second stopper wall (105b) of the cap comes in contact with the stopper pin (310) so as to limit the further rotation of the cap as shown in figure 11.

The inventors have been working to develop the invention, so that advantage can be achieved 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 will be apparent to those skilled in the art. It is intended that the specific embodiments and configurations herein disclosed are illustrative of the preferred nature of the invention, and should not be interpreted as limitations on the scope of the invention.

CLAIMS:
1. A protective device for cylinder lock in vehicle comprises:
a. a mounting body (300) and a cap, the cap is co-axially mounted on the mounting body (300) and rotatable, the said cap (100) consisting a centrally placed magnet key receiving recess (102) and a key insertion hole (101), the said key insertion hole (101) of cap is aligned with the key insertion hole (401) of the cylinder lock,

b. a shutter (200) being adapted between the said mounting body (300) and the cap (100) and at the same time the said shutter operationally configured with either inner peripheral side of the cap or top inner surface of the cap, up to predetermined length, so as to achieve tandem motion between the cap and shutter to either uncover or cover the key insertion hole (401) of cylinder lock while rotating the cap.

2. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the shutter has an irregular profile consisting of a first end E1 with gear teeth (201) and a second end E2 having covering portion C to cover key insertion hole (401) of cylinder lock.

3. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the cap having gear teeth G at inner surface of side wall (103) that remain in mesh with gear teeth (201) of the shutter.

4. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the shutter having optionally a protruding portion (i.e. a shutter pin (221)) perpendicular to the plane that accommodate in a slot (108) of the top inner surface of the cap, so as to achieve relative motion between the cap and shutter to either uncover or cover the key insertion hole (401) of cylinder lock while rotating the cap.

5. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the mounting body comprises a stopper pin (310) perpendicular to the plane of mounting body (300).
6. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the cap comprises at the inner side wall (103) at least two protruded portions (105a, 105b) extended towards center of cap, and the stopper pin of the mounting body remain in the available space between the protrusions, thereby limit the rotation of cap up to a pre-determined distance.

7. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the mounting body (300) has constructions to accommodate plurality of magnet (307) in line with the magnet key receiving recess (102).

8. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the said constructions is in form of circular boundary surface around the key insertion hole (401) of the cylinder lock.

9. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the shutter is pivotally mounted on a pivot (302) on the mounting body (300).

10. The protective device for cylinder lock in vehicle as claimed in claim 1, wherein the pivot is located adjacent to the key insertion hole (401) of the cylinder lock.