1975-06-26
1976-12-14
Sheridan, Robert G.
B65G 6702
Patent
active
039970701
ABSTRACT:
A stair climber moving system (FIGS. 1-2) for moving a load up flights of stairs FIGS. 4A-4H) which includes a basic tractor unit, a load mounting platform attached to the tractor which allows the load to be shifted longitudinally with respect to the tractor during use, and a collapsible dolly (FIGS. 3A-3D) permitting load changes from horizontal (3B) and inclined (3D) positions.
The collapsible dolly includes a fixed horizontal bottom platform supported by five sets of caster wheels. A collapsible load bearing platform is mounted and supported on the fixed bottom platform by a fixed center vertical strut member through a hinge connection. At opposed ends of the collapsible load bearing platform are auxiliary, end, support members, one fixed and the other collapsible, the latter of which is spring biased in a normally vertical, supporting disposition. The load bearing platform is collapsible, i.e. put in an inclined disposition by means of moving said collapsible auxiliary end support out against the force of the spring, allowing the load bearing platform to rotate about its hinged connection.
Having the dolly change from an inclined to a horizontal disposition minimizes the total horizontal, longitudinal dimension of the system which is particularly useful in very tight quarters such as occur on stair landings (cf. FIGS. 4G & 4H). Having a load-shifting capability during use permits precise balancing of the system as needed throughout the movement of the load up the stairs.
REFERENCES:
patent: 3512658 (1970-05-01), Harlan
patent: 3804275 (1974-04-01), Lee
Lee Inventions, Inc.
Sheridan Robert G.
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