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Anti-theft apparatus for protecting an uncoupled trailer, including a portion mountable within the ball receiving end of a trailer and also including a U-shaped member and a draw bar insertable through the legs thereof for securing the assembly to the trailer tongue. A housing formed on one side of

Anti-theft apparatus for protecting an uncoupled trailer, including a portion mountable within the ball receiving end of a trailer and also including a U-shaped member and a draw bar insertable through the legs thereof for securing the assembly to the trailer tongue. A housing formed on one side of the U-shaped member protects a padlock secured to a slot in the dead bolt.

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1. Anti-theft apparatus for a towable trailer of the type including a ball-type trailer hitch coupler defining a ball-receiving socket and having a yoke hinged for limited rotational motion about a pivot pin upon rotation of a hand-tightening knob, comprising in combination: a first U-shaped memb

1. Anti-theft apparatus for a towable trailer of the type including a ball-type trailer hitch coupler defining a ball-receiving socket and having a yoke hinged for limited rotational motion about a pivot pin upon rotation of a hand-tightening knob, comprising in combination: a first U-shaped member having a pair of parallel, spaced apart legs mountable about the tongue of a towed trailer and having at least one pair of aligned apertures formed through said legs; a dead bolt having a generally rectangular cross-section and a transversely extending head member formed at one end thereof and having a lateral slot extending inwardly from one edge surface of said dead bolt proximate the end of said dead bolt opposite said head member, said slot being of a width to receive the shackle portion of a padlock; hook means affixed to said U-shaped member and mountable within said ball-receiving socket of said ball-type trailer hitch coupler and including an inwardly turned projection for mounting about said pivot pin of said trailer hitch coupler; and housing means affixed to one of said legs of said U-shaped member overlaying the said apertures in said one of said legs such that the slot containing end of said dead bolt is received therein for enclosing the shackle portion of said padlock when fastened about said dead bolt and entered in said slot. 2. Apparatus as set forth in claim 1 wherein said hook means comprises a second U-shaped member mounted orthogonal to said first U-shaped member having first and second upwardly extending side members and one of which side members includes said inwardly turned projection for mounting about said yoke pivot pin. 3. Apparatus as set forth in claim 1 wherein said housing means comprises a formed extension of one of said legs of said first U-shaped member, said extension being bent back upon itself so as to enclose said shackle portion of said padlock when said dead bolt is passed through said pair of aligned apertures and said padlock is closed with said shackle in said slot. 4. Apparatus as set forth in claim 1 wherein said dead bolt is comprised of a laminated elongated metallic member. 5. Anti-theft apparatus for a towable trailer of the type having a hitch coupler with a ball-receiving socket and a pivotal yoke supported by a transversely extending pivot pin comprising, in combination: (a) a generally U-shaped member having a pair of parallel legs spaced from one another by a distance slightly greater than the width of said hitch coupler at said ball-receiving socket, said legs being of a length which is greater than the height of said hitch coupler proximate said ball-receiving socket, each of said legs having at least one cruciform shaped aperture formed therethrough, said apertures in each of said legs being generally aligned with one another; (b) a generally flat, elongated, laminated dead bolt means having a cross-sectional shape insertable through said cruciform apertures, a transversely extending head larger than said apertures at one end of said dead bolt means and a lateral slot extending inwardly from one edge surface of said dead bolt at a predetermined angle; (c) ball-receiving socket occluding means fixedly attached to the base of said U-shaped member and having an integrally formed, inwardly directed hook segment for engagement with said transversely extending pivot pin for preventing rotation of said generally U-shaped member when said ball-receiving socket occluding means is disposed within said socket and said dead bolt means is inserted through said aligned apertures.