Hydraulic door operator with overtravel restraint

Details Hydraulic door operator with overtravel restraint Hydraulic door operator with overtravel restraint

1977-04-01

1978-07-04

Feldbaum, Ronald

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Checks and closers

Liquid

16 62, E05F 310, E05F 322

Patent

active

040979563

ABSTRACT:
A door operator mechanism includes a spring biased piston 5 having a non-return valve 6 in its end face slidably disposed in a hydraulic cylinder 3 and coupled to a door lever arm through a pinion shaft 11, a pinion gear 9, and a tooth rack 7 on the piston. If the door is opened beyond a normal angle a rod member 16 disposed within the spring 4 engages and compresses a resilient member 15 disposed between one end of the cylinder and the spring. The resilient member has a higher coefficient of resiliency than the spring and thus is not initially compressed thereby, and its restraining force increases sharply at high compression ratios, to thereby increasingly resist door overtravel.

REFERENCES:
patent: 3284841 (1966-11-01), Patriquin
patent: 3675270 (1972-07-01), Jentsch
patent: 3701180 (1972-10-01), Jentsch et al.

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