Door closer having a braking mechanism comprising an elastomeric

Details Door closer having a braking mechanism comprising an elastomeric Door closer having a braking mechanism comprising an elastomeric

1982-06-21

1984-06-26

Silverberg, Fred Andrew

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

Checks and closers

Liquid

16 58, 16 62, 16 79, 16 82, 92 63, 92136, 92142, E05F 304

Patent

active

044557086

ABSTRACT:
A door closer comprising at the end of one of two pivotally interconnected arms a closing device whose housing encloses a cylindrical piston driven by the arm through a rack-and-pinion system. On each side of this piston a return spring and a bag, filled with an incompressible but deformable viscous gum placed in a hollow piston biased elastically toward the cylindrical piston are placed on each side of the first-mentioned piston. The hollow piston has a diameter distinctly larger than the diameter of the first-mentioned piston, and the combined actions of this difference in diameters and of the viscosity of the gum ensure an effective braking of the return of the first-mentioned piston.

REFERENCES:
patent: 3021926 (1962-02-01), Wasdell
patent: 3259937 (1966-07-01), Korikov
patent: 4115897 (1978-09-01), Zunkel
patent: 4349939 (1982-09-01), Tillmann

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