Apparatus for holding open a door or the like

Details Apparatus for holding open a door or the like Apparatus for holding open a door or the like

1976-02-05

1977-10-18

Kundrat, Andrew V.

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

Closure checks

Pneumatic

248206R, 16DIG21, 292DIG28, E05F 500

Patent

active

040539610

ABSTRACT:
Apparatus for holding open a door or similar closure member for a limited period, which may be predetermined, whereupon the door is automatically released and is able to return to its closed position, includes suction means for attachment to the door and/or surface against which the door is to be held in face-to-face relationship. The period of time during which the suction means is active may be determined by means of an air leakage to the suction means, or by means of a spring acting against the suction means.

REFERENCES:
patent: 735415 (1903-08-01), Schrodel
patent: 1621974 (1927-03-01), Deenihan
patent: 2015622 (1935-09-01), Evulich
patent: 2062157 (1936-11-01), Benshimol
patent: 2319727 (1943-05-01), Duggan
patent: 2652585 (1953-09-01), Herbenar
patent: 3042958 (1962-07-01), Spears
patent: 3042959 (1962-07-01), Strom

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