Air hoist with an overload protection device

Details Air hoist with an overload protection device Air hoist with an overload protection device

1974-09-16

1976-05-18

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

254187D, B66D 100

Patent

active

039572480

ABSTRACT:
The pneumatic motor of an air hoist has a blow-off valve in its supply passage. When the blow-off valve is open to the atmosphere, the air pressure at the inlet of the motor is substantially reduced. The blow-off valve is held closed by a piston having a piston surface in an air chamber. The air chamber is supplied with compressed air through a restriction. The hoist has a hook by which it can be suspended and the hook is clamped to the housing of the hoist by means of a pre-loaded Belleville-spring. When the spring yields due to overload, a vent valve will open and vent said air chamber. As a result, the blow-off valve suddenly opens to limit the torque of the motor.

REFERENCES:
patent: 3384350 (1968-05-01), Powell
patent: 3669411 (1972-06-01), McKendrick

Affiliated with

Also associated with

Rating

Air hoist with an overload protection 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 with an overload protection device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air hoist with an overload protection device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2230641