Hydraulic door openers

Details Hydraulic door openers Hydraulic door openers

1974-07-25

1976-04-06

Downey, Kenneth

Movable or removable closures

With operator for movably mounted closure

Operating lever or link and closure swing about parallel axes

60477, E05F 1504

Patent

active

039480003

ABSTRACT:
A hydraulic door opener comprising a closed hydraulic circuit including a motor for actuating a door operating spring surrounded by a housing which forms a component part of the hydraulic circuit and serves as a reservoir for the hydraulic liquid.

REFERENCES:
patent: 2552624 (1951-05-01), Enzenbacher
patent: 2911210 (1959-11-01), Ferguson

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