Implements or apparatus for applying pushing or pulling force – Hoisting truck – Screw
Patent
1989-08-23
1990-11-20
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Screw
B60P 110
Patent
active
049712926
ABSTRACT:
A hoist apparatus for lifting a load includes an elongated, hollow tubular post formed with an elongated slot, and a T-shaped base for supporting the post in an upright position. The base has a plurality of lockable casters mounted thereon for portability of the hoist. A ball screw is rotatably suspended within the post and a follower nut is movably engaged with the ball screw for linear movement therealong, in response to manual rotation of the ball screw by a handwheel which is operatively connected thereto. A cylindrical-shaped carriage is engaged by the follower nut within the post for linear movement therewith along the ball screw. A plurality of crowned rollers are rotatably mounted adjacent to each of the ends of the carriage in a generally circular spaced arrangement, whereby each of the rollers rotatably arcuately contacts the curved interior surface of the tubular post for slideably engaging the carriage with the post for smooth movement of the carriage within the post. A stud is mounted on the carriage and extends transversely through and outwardly of the elongated slot of the post for retaining a lifted load thereon. A spring-biased safety detent is engageable with the handwheel in its normally biased position to prevent rotation of the handwheel and the ball screw, and corresponding movement of the carriage under the weight of a load, so that a locking clamp can be manually clamped to the post to lock the carriage, stud and the load carried thereon at a predetermined elevation.
REFERENCES:
patent: 2742257 (1956-04-01), Hott et al.
patent: 2891413 (1959-06-01), Millns
patent: 2895712 (1959-07-01), Stovern et al.
patent: 2910883 (1959-11-01), Reed, Jr.
patent: 2915913 (1959-12-01), Molyneux
patent: 3962737 (1976-06-01), James
patent: 4076216 (1978-02-01), Nussbaum
patent: 4593883 (1986-06-01), Nelson
Craig Tool & Machine, Inc.
Watson Robert C.
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