Abstract: An exercising machine having vertical tracks, a vertically reciprocative carriage guide by the tracks, weights to bias the carriage downwardly and a lifting arm removably connected to the carriage, and having a failsafe mechanism for automatically interlocking the lifting arm and the carriage to prevent accidental decoupling thereof.

Abstract: A portable back rest adapted to be detachably mounted onto stadium bleacher seats and the like. The back rest is formed of a single piece of flexible material and comprises a back panel, a pair of side panels hingeably connected thereto, and front and rear locking elements adapted to securely grip the bleacher seat. In its transport configuration, the side panels fold inwardly into close proximity with the back panel, thereby forming a compact readily portable unit.

Abstract: A sway control adaptor for mounting one end of a sway control assembly to a towing vehicle adjacent the trailer hitch is disclosed. The adaptor includes a upper elongate member having one part which overlies a portion of the trailer hitch and a second part extending transversely from the first part. A lower elongate member underlies that portion of the trailer hitch, and is bolted to the upper elongate member to mount the members to the hitch. A sway control hitch ball is mounted to the free end of the second part of the upper elongate member for attachment of the leading end of the sway control device to the towing vehicle on one side of the hitch.