The draw pin safety lock device for a draw pin connection between the drawbar of a towing vehicle, such as a tractor, and the tongue of a towed implement includes a mounting member attached to the drawbar adjacent the draw pin. A keeper arm is pivotally mounted on the mounting member and is yieldably urged into engaging relation with the upper end of the draw pin to thereby yieldably resist upward movement of the draw pin. The keeper arm may be pivoted through an overcenter position to a release position to permit removal of the draw pin.

To prevent personal injury and property damage by accidental displacement of a hitch tow-pin, an easily mountable unit has an arm horizontally swingable to and from a position above the upper end of the conventional tow-pin of a clevis-type hitch. The pivot pin for the swingable arm can also serve as part of the unit's mounting structure by extending through a bore in, and anchored to, a draw bar. Or the pivot pin can be fixed to a sleeve slidable over a draw bar. Each species employs a detent device to prevent accidental arm movement away from its draw-pin-retaining position.

An agricultural tractor as a rearwardly extending drawbar and a rearward PTO output shaft connectible to an input drive shaft on a trailing PTO driven implement through a telescoping drive assembly, which includes front and rear universal joints. The drawbar is connected to the implement tongue through a hitch adapter which provides articulation between the tractor and the implement about a vertical axis that is equidistant from the two universal joints, so that the universal joints articulate at equal angles when the tractor is turned relative to the implement. The hitch adapter includes a housing having top and bottom walls, a vertical pin being insertable into vertically aligned bores in the top and bottom walls and into a vertical bore in the drawbar to connect the hitch adapter to the drawbar, the adapter having a vertical pivot element rearwardly of the pin for pivotal connection to the forward end of the implement tongue. A locking device is provided on the housing to releasably lock the pin in said bores to prevent inadvertent separation of the hitch adapter from the drawbar, and shim means are provided between a horizontal plate and the top wall of the housing to vary the clearance between the plate and a bottom wall of the housing to accommodate different vertical thicknesses of a tractor drawbar, the drawbar being disposed between and abutting the plate and the housing bottom wall.

A pair of spaced parallel plates are affixed to and extend from a vehicle. The plates have bores formed therethrough in perpendicular alignment. A pin latch is affixed at one end thereof to the upper one of the plates in a manner whereby the pin latch extends parallel to and spaced from the one of the plates and is free from the one of the plates along its entire length except for the one end thereof. A pin device comprises a bar-like pin bar having first and second spaced opposite ends and a pin is affixed to the first end of the pin bar and removably extends from the one of the plates through the bores of both the plates in a manner whereby a ring coupled to another vehicle and positioned around the pin is secured on the pin by and between the plates. A spiral spring has first and second spaced opposite ends and is affixed at its first end to the second end of the pin bar. The spring is affixed at its second end to the one of the plates at a point spaced from the second end of the pin bar on the opposite side of the pin latch from the bores. The spring applies a force to the pin bar maintaining the pin bar between the pin latch and one of the plates about the pin as a pivot whereby the pin is removable from the bores upon the application of manual force against the force of the spring to move the second end of the pin bar so that the pin bar is moved about the pin as a pivot out of the pin latch thereby permitting the pin bar to be raised above the one of the plates to remove the pin from the bores.

A safety device for maintaining in place a pin connecting the drawbar of a tractor to the tow bar or tongue of a towed piece of equipment. The safety device is mounted on the drawbar and is slideable along the drawbar. An arm extends outwardly from the device, and the device is moved so that the arm is over the top of the drawbar pin when the pin is in place thereby preventing it from becoming disengaged from the drawbar and tongue. A locking pin prevents the safety device from sliding along the drawbar so as to keep it in its pin retaining position.