초록 ▼

A retractable bed is capable of handling heavy cargoes to an extended length approximately double the retracted length. The retractable bed comprises a fixed frame, a secondary frame, and a top frame. A unique arrangement of rollers engages the various frames. The top frame, which supports the cargo

A retractable bed is capable of handling heavy cargoes to an extended length approximately double the retracted length. The retractable bed comprises a fixed frame, a secondary frame, and a top frame. A unique arrangement of rollers engages the various frames. The top frame, which supports the cargo deck, is supported by both the fixed and secondary frames. The invention includes a locking device that is spring loaded to automatically lock the frames in selected locations between the extended and retracted positions. The locking device has a handle that extends to the front of the top frame, where it is conveniently operated by a person.

대표청구항 ▼

A track and roller system for horizontally moving a load longitudinally over a surface between front and back positions comprising: a. a top frame comprising: i. a deck to support the load; ii. first and second elongated laterally spaced beams having front and back ends for supporting the deck; iii.

A track and roller system for horizontally moving a load longitudinally over a surface between front and back positions comprising: a. a top frame comprising: i. a deck to support the load; ii. first and second elongated laterally spaced beams having front and back ends for supporting the deck; iii. a first roller mounted to the back end of each beam; and iv. a second roller mounted to each beam at approximately the midpoint thereof; b. a secondary frame comprising: i. first and second elongated beams having lengths approximately equal to the respective top frame beams and having front and back ends and underlying at least a portion of the respective top frame beams, the secondary frame beams being adapted to receive the first and second rollers mounted to the respective top frame beams for permitting the top frame to reciprocate longitudinally along the secondary frame between the front and back positions; ii. a first roller mounted to the back end of each beam; iii. a second roller mounted to each beam at approximately the midpoint thereof; and iv. a third roller mounted to the front end of each beam and protruding thereabove to support the respective top frame beam; and c. a fixed frame comprising: i. first and second elongated beams having lengths approximately equal to the lengths of the respective secondary frame beams and having front and back ends, the fixed frame beams being fixedly mounted to the surface and underlying at least a portion of the respective top frame beams, the fixed frame beams being adapted to receive the first and second rollers of the secondary frame to thereby permit longitudinal reciprocation of the secondary frame along the fixed frame between the front and back positions; and ii. a roller mounted to the front end of each beam and protruding above the beam to support the overlying top frame beam, so that the top and secondary frames can be extended from the fixed frame to an extended length approximately double the length of the fixed frame.