Air hoist and its control device

Details Air hoist and its control device Air hoist and its control device

1976-05-28

1977-12-06

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

1376275, B66D 108

Patent

active

040613119

ABSTRACT:
An air hoist having a reversely rotatable drum adapted to have an elongated flexible load-carrying element, such as a cable, wound onto or off of the drum to permit lifting or lowering of a load. The drum also serves as a reciprocating cylinder and is axially slidably disposed in sealed engagement with an internal piston which, while it rotates with the drum, is axially restrained. A fluid pressure chamber is formed between the end wall of the drum and the piston so that the pressure fluid which is supplied to or discharged from this chamber controls the axial displacement of the drum. A ball-screw arrangement coacts between the drum and a stationary support so as to cause rotation of the drum in response to axial movement thereof, whereby the drum undergoes a helical-type motion during winding or unwinding of the load-carrying element. A control device is associated with the hoist for controlling the flow of pressure fluid to or from the pressure chamber.

REFERENCES:
patent: 3109615 (1963-11-01), Fritz
patent: 3384350 (1968-05-01), Powell
patent: 3756563 (1973-09-01), Stone
patent: 3791627 (1974-02-01), Stone et al.
patent: 3944294 (1976-03-01), Masuda et al.
patent: 3945401 (1976-03-01), Greenwood

Affiliated with

Also associated with

Rating

Air hoist and its control device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Air hoist and its control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air hoist and its control device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1547144