ANTITHEFT DEVICE LOCK

FIELD: transport engineering; security systems. ^ SUBSTANCE: invention relates to antitheft systems installed on vehicle steering gear shaft to interlock shaft in turned position. Proposed lock of antitheft device has split housing consisting of two parts enclosing member to be interlocked and connected by screws whose heads are flush in one part of housing and are protected from unscrewing by detachable bar fixed in T-shaped slots of housing by means of spring-loaded catch provided with cavity on side and arranged in recess of bar and in mating recess made on housing, walls of recesses being square to plane of adjoining of bar to housing. Longitudinal hole is made in bar intersecting with recess for catch which accommodates mechanism to bring catch out of recess in housing provided with secret element containing cylindrical lock with key. Entry face is made on outer side of housing pointed to bar from side of getting into T-shaped slot. Mechanism to bring catch out of recess in housing is made in form of shaft-crank connected by one end with cylinder lock and engaging by tenon on other end with recess on side of catch. In extreme position on tenon, close to housing, clearance between tenon and wall of recess on catch from side of housing is less than protection of catch from bar. Shaft-crank is provided with two balls spring-loaded relative to each other and installed in diametral hole made in shaft-crank and engaging with edges of holes in bar mating to diametral hole in shaft-crank when shaft-crank is in intermediate position, in which clearance between tenon and wall of recess on catch from bar. ^ EFFECT: prevention of demounting of antitheft device by forcing off catch, improved protection against hi-jacking. ^ 3 dwg