Automatic door closing device

Details Automatic door closing device Automatic door closing device

1977-09-15

1978-07-04

Feldbaum, Ronald

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

Checks and closers

Liquid

16 49, E05F 314, E05F 322

Patent

active

040979571

ABSTRACT:
An automatic door closing device for use in a sliding type door, which includes a driving section having a spiral spring disposed in a casket to urge the sliding door toward closing direction and a buffer mechanism having a cylinder and a piston for moderating closing speed of the door. The inner end of the spring is secured to a stationary shaft on which the piston is coaxially mounted. The casket containing the spring and fixing the outer end thereof and the cylinder containing the piston through an anti-rotating mechanism are integrally formed as a housing, into which lubricating oil is filled.

REFERENCES:
patent: 1970008 (1934-08-01), Larson
patent: 3038195 (1962-06-01), Bardfeld
patent: 3267513 (1966-08-01), Wartian
patent: 3680171 (1972-08-01), MacDonald

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