Emergency elevator

Details Emergency elevator Emergency elevator

1981-12-17

1984-12-18

Skaggs, H. Grant

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 94, B66B 500

Patent

active

044886217

ABSTRACT:
An emergency elevator which has a guided cage and a cylinder with closed ends. Valves communicate with the interior of the cylinder adjacent its ends. An additional valve communicates with the interior of the cylinder at a location between one end of the cylinder and the associated valve. A piston is slidably disposed in the cylinder and connected to the cage so that the downward movement of the cage is restrained. A counterweight is coupled to the cage and is of a sufficient weight to raise the cage when it is empty. The counterweight is conveniently disposed within the cylinder and can be integral with the piston.

REFERENCES:
patent: 298292 (1884-05-01), Curtis
patent: 392753 (1888-11-01), Read et al.
patent: 407200 (1889-07-01), Guthrie
patent: 494217 (1893-03-01), Miles
patent: 815401 (1906-03-01), Breckon

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