Antitheft security device for trailers of trucks

Anti-theft security device for preventing theft of an immobilized and un-coupled detachable trailer, including semi-trailers, comprising:

• parking props comprising an upper tube and a lower tube which are slidable in each other;
• an articulated sole on a lower portion of said lower tube, said sole being adapted for engagement with the ground;
• an internal screw within said lower tube;
• a bevel gear for driving said internal screw;
• a casing affixed to said parking props;
• a disengageable assembly of at least one of serrated wheels and gears housed in said casing;
• and
• a safety key lock cooperating with and disengaging said disengageable assembly to uncouple a motive energy source of a maneuvering mechanism of said parking props, to thereby prevent persons without a requisite safety key from lifting said parking prods when the trailer is parked;
• said safety lock integrated into said casing, and comprising a catch cooperating with a double set of serrated wheels housed in said casing;
• one set of said double set of serrated wheels being axially mobile so as to enable triggering of two different gear reductions or selection of a neutral position preventing the axially mobile serrated wheels from meshing on corresponding gears;
• and
• said catch comprising two end portions including abutments preventing the security device from being forced by twisting said catch, said abutments comprising a length calculated so that ends of said abutments brush either an internal wall of an external shield of said casing, or a bigger driven serrated wheel of the other set of serrated wheels.

Anti-theft security device for preventing theft of an immobilized and un-coupled detachable trailer, including semi-trailers, comprising:

• parking props comprising an upper tube and a lower tube which are slidable in each other;
• an articulated sole on a lower portion of said lower tube, said sole being adapted for engagement with the ground;
• an internal screw within said lower tube;
• a bevel gear for driving said internal screw;
• a casing affixed to said parking props;
• a disengageable assembly of at least one of serrated wheels and gears housed in said casing;
• and
• a safety key lock cooperating with and disengaging said disengageable assembly to uncouple a motive energy source of a maneuvering mechanism of said parking props, to thereby prevent persons without a requisite safety key from lifting said parking prods when the trailer is parked;
• said casing comprising an external shield, and said safety lock is non-removably mounted inside said external shield of said casing;
• and said safety lock comprising a fork-shaped catch constructed and arranged to immobilize a set of driving serrated wheels in a neutral position;
• said set of driving serrated wheels is borne by an axially mobile shaft, and said catch is capable of being positioned in a straddle on an edge of a bigger serrated driving wheel of said set of driving serrated wheels;
• and
• said catch comprising two end portions including abutments preventing the security device from being forced by twisting said catch, said abutments comprising a length calculated so that ends of said abutments brush either an internal wall of an external shield of said casing, or said bigger driven serrated wheel of a set of driven serrated wheels.