Hydraulic hinge having rotatable shaft and linearly movable plug

Details Hydraulic hinge having rotatable shaft and linearly movable plug Hydraulic hinge having rotatable shaft and linearly movable plug

1993-12-10

1995-05-30

Cuda, Irene

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

Hinge

Including means to hold or retard hinged members against...

16 54, E05F 304

Patent

active

054190134

ABSTRACT:
A hydraulic hinge includes a cylinder sealed at both ends having a hexagonal shaft rotatably received therein with a portion thereof extending out of the cylinder. A circumferential space is defined between the shaft and the inside diameter of the cylinder to be filled with hydraulic fluid. A plug having a hexagonal hole corresponding to the cross section of the shaft is fit over the shaft to be rotatable therewith. The plug has an external thread of a desirable pitch to be engageable with an inner thread formed inside the cylinder so that the plug is linearly moved relative to the cylinder and the shaft by the pitch of the external thread thereof when the shaft is rotated. The plug divides the circumferential space into two chambers. A passage is formed in the shaft to form a fluid communication between the two chambers. A spherical member is spring-biased to block the passage, serving as a check valve, so as to allow the hydraulic fluid to flow uni-directionally at a normal flow rate. The spherical member has a passage of reduced cross-section dimension formed therethrough to allow the hydraulic fluid flow between the two chambers at a smaller flow rate. With the different flow rates provided by opening and closing the spherical member, the rotations of the shaft relative to the cylinder along different directions are controlled at different speeds.

REFERENCES:
patent: 4068344 (1978-01-01), Okabe
patent: 4756051 (1988-07-01), Shy
patent: 5109571 (1992-05-01), Ohsima et al.
patent: 5211269 (1993-05-01), Ohshima

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