Abstract: 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.

Abstract: An on-land-type portable knock-down duck-blind comprises a frame formed of a plurality of arch-shaped metal or plastic tubes adapted to support a removable water-proof fabric cover. The tubes are held in parallelism by short spacing tubes, and are interconnected and are braced by a transverse inverted-U-shaped member having spaced U-shaped bends therein to receive sleeves which detachably connect the ends of each arch-shaped tube where medially divided for portable compactness. A pair of two-panel doors are mounted on rectangular frames which are detachably mounted on the central pair of parallel tubes by depending pins received in holes in the tubes.

Abstract: A commercially available farm tractor having a rear-mounted upwardly swingable power lift, is provided with a pair of hay-bale-penetrating tines rigidly parallelly connected at their base ends by a member that is easily and quickly detachably mountable on the free ends of parallel lift arms. A delta-shaped frame is attached to the front of the tractor to carry a second pair of parallel bale-impaling tines which are upwardly swingable by a single hydraulic cylinder. The assemblage provides quick and easy loading and unloading of two bales, and a weight-balanced load during carrying.