Fluid-operated door opener

Details Fluid-operated door opener Fluid-operated door opener

1987-04-21

1988-08-09

Schmidt, Frederick R.

Implements or apparatus for applying pushing or pulling force

Fluid pressure

Vehicle attached

254100, 29239, 72705, B66F 324

Patent

active

047623047

ABSTRACT:
The opener consists of two hydraulic actuators which are adapted to act along in two different directions in an horizontal plane, one of said directions being parallel or substantially parallel to the surface of the closed and locked door which is to be opened and the other direction being normal to said door surface. Jamb-engaging elements are associated with a first of the actuators, operation of said actuator causing the elements to engage the door jambs very firmly; operation of the second of the actuators pushes the closed/locked door inwardly out of the door frame.

REFERENCES:
patent: 1988840 (1935-01-01), Hartl
patent: 2984072 (1961-05-01), Born
patent: 3014696 (1961-12-01), Trott
patent: 3376795 (1968-04-01), Allen
patent: 4270733 (1981-06-01), DePue
patent: 4657225 (1987-04-01), Hoehn et al.
patent: 4660806 (1987-04-01), Masters

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