Hydraulic door operator with overtravel restraint

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

E - Fixed Constructions

05

F

16/17, 268/24

E05F 3/10 (2006.01)

Patent

CA 1072589

ABSTRACT OF THE DISCLOSURE 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.

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