Abstract:
An anti-theft clip for securing a conventional lock cylinder to a car door and for preventing unwanted tampering with a lever operatively connected to the lock cylinder. The clip includes resilient legs which straddle and hold the lock cylinder. Panels attached to the resilient legs shield the lock cylinder from unwanted tampering.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to means for securing car door locks to the car doors and in particular to such means which not only secure the locks but also prevent tampering with the locks. 
     Many car door locks when used in conjunction with certain door handle assemblies, can be manipulated from a door-locked position to a door-unlocked position. This unwanted tampering can be accomplished by inserting a tool through holes which accommodate the exterior portions of the door handle assembly. After insertion, the tool is manipulated to move a lever operating arm attached to the car door lock cylinder. 
     Accordingly it is an object of this invention to provide an anti-tampering or anti-theft clip which not only mounts a car door lock cylinder to a car door but also prevents unwanted tampering with a lever or arm operatively connected to the door lock cylinder. These and other objects of the invention are achieved as follows: 
     SUMMARY OF THE INVENTION 
     An anti-theft clip is provided with two resilient legs which span and hold a conventional lock cylinder. Two panels are attached to the resilient legs. The panels shield the lock cylinder from tampering. The panels are of sufficient size to also prevent tampering with an operating arm or lever operatively attached to the lock cylinder. 
     Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1A is a partially fragmented isometric view of a conventional car door which illustrates those portions of the interior of the door germane to this invention. 
     FIG. 1B is a partial sectional view of a portion of the door shown in FIG. 1A and illustrates a thematic representation of a conventional door handle assembly. 
     FIGS. 2A, 2B &amp; 2C are illustrations of the anti-theft clip of this invention. 
     FIG. 3 is a view similar to FIG. 1A showing the anti-theft clip of this invention in place. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 1A is a partially fragmented isometric view of a conventional car door 10 which illustrates the interior door structure germane to this invention. FIG. 1B is a partial sectional view along the lines 1b--1b shown in FIG. 1A; it illustrates the exterior surface 10a of the car door 10 and a thematic representation of a conventional door handle assembly 12. 
     The door handle assembly 12 forms no part of this invention. As shown in FIG. 1B, the door handle assembly 12 typically reposes within a recess 10b provided in the exterior surface 10a of the car door 10. The door handle assembly 12 is conventionally pivotally mounted to the door 10 in a manner not shown. The door 10 is provided with an opening 10c which accommodates the lever operating portions 12a of the door handle assembly 12. As is well known the lever operating portions 12a control levers (not shown) which operate a door latch mechanism (not shown). The door handle assembly 12 is spaced from the exterior surface of the recess 10b with an open slotted plastic insert 13 secured within the recess 10b. 
     When the door handle assembly is in the UP position, as shown in FIG. 1B, the interior of the door is accessible through the opening 10c. 
     With further reference to FIG. 1A, a conventional lock cylinder 14 is secured to the interior of the door 10 with a conventional U-shaped clip 16 such as that disclosed in the U.S. Pat. No. 2,948,141. The end of the cylinder 14 is provided with a movable arm 18 which is attached to a link 20. The other end of the link 20 operatively engages a door latch mechanism (not shown) to lock or unlock the door latch (not shown) upon movement of the link 20. 
     In FIG. 1A, the arm 18 is shown in the door -- locked position. Upon insertion of a key into the lock cylinder, the arm 18 moves downwardly in a counter -- clockwise direction to thereby move the link 20 which unlocks the door latch mechanism (not shown). 
     At this point it should be noted that a suitably sized and shaped tool 15 could be inserted from the exterior side of the car door 10 and through the opening 10c in the door recess 10b to thereby engage the arm 18, or elbowed portion, if any, of the link 20, and move it from its horizontally oriented door-locked position to its vertically oriented door-unlocked position. As will be explained hereinafter this unwanted entry and unlocking without benefit of a key is prevented by providing a cylinder clip 22 which not only secures the cylinder 14 to the door 10 but also shields the arm 18 from unwanted tampering. 
     The anti-tampering clip 22 of the present invention is shown in an isometric view in FIG. 2A. The clip 22 is preferably formed from spring steel or other suitable material. 
     The clip 22 includes two spaced resilient legs 22A, 22B which extend from a transverse connecting or span portion 22c. As best seen in FIG. 2C, the span portion 22c is provided with a cutout 22d which accommodates a correspondingly shaped lug 14a protruding from the lock cylinder 14. The lug 14a nests within the cutout 22d to thereby prevent rotation of the clip 22. (The lock cylinder 14 is registered with the door 10 to prevent rotation in a conventional manner, not shown). 
     With further reference to FIG. 2A, the clip 22 also includes a rectangularly shaped top panel 22e and a similarly shaped side panel 22f. The top panel 22e is spaced from the leg 22a. The span portion 22c and the legs 22a, 22b are preferably formed as a unit. The top panel 22e and side panel 22f may also be formed at the same time as the span portion 22c and the legs 22a, 22b or may be added thereto in a subsequent manufacturing operation in any conventional manner. 
     As best seen in FIGS. 2A and 2B, the legs 22a, 22b are bowed at a&#39; and b&#39; respectively, intermediate their ends. The bowing increases resiliency and imparts a spring like action to the legs, 22a, 22b, to firmly secure the cylinder 14 to the door 10. As best seen in FIG. 2B, the cylinder 14 is provided with a key flange 14b and two slots 14c, 14d. As is well known the legs 22a, 22b repose within the slots 14c, 14d, respectively; the cylinder 14 is then securely mounted to and through the door by the tendency of the spring like legs 22a, 22b to urge the flange 14b tightly against the exterior surface of the car door 10. 
     In FIG. 3 the anti-theft clip 22 of the present invention is shown in place. With the clip 22 oriented as there shown, the side panel 22f and the top panel 22e effectively prevent tampering with the arm 18 by the insertion of a tool through the opening 10c. 
     Comparison of FIGS. 1 and 3 clearly shows that the present invention provides a safe and inexpensive anti-theft device for those cars provided with the system shown in FIG. 1. 
     Although the invention has been explained and illustrated in a car door environment, the invention has universal application and may be used in any environment where unwanted tampering with a lock is to be minimized or eliminated.