Fast food service access window with segmented push-bar

Details Fast food service access window with segmented push-bar Fast food service access window with segmented push-bar

1985-12-20

1988-03-29

Dorner, Kenneth J.

Movable or removable closures

Closures interconnected for concurrent movement

Closures mounted for swinging

49114, 49115, 49333, E05C 706

Patent

active

047334983

ABSTRACT:
An access window for use in fast food establishments and other similar drive-thru business establishments is disclosed. The window broadly comprises an elastic operating mechanism, two planar window members and a segmented articulated push-bar operator which is pushed to open the access windows. The push-bar operator can be locked in the open position. Upon releasing and/or unlocking the operator push-bar assembly the access window returns to its closed position by means of a closer bias member. The access window also comprises a locked window bias member which absorbs the pushing action on the operator push-bar, in the event the access window is latched shut, without damaging the access window and further without damaging the operating mechanism. The operating mechanism employs an off-center groove in the rotor located in the bottom hinge assembly which serves to produce a greater initial opening torque than the opening torque at the end of the opening cycle and conversely produces a greater closing torque at the end of the closing cycle.

REFERENCES:
patent: 1975953 (1934-10-01), Keys
patent: 3940887 (1976-03-01), Slaybaugh
patent: 4411102 (1983-10-01), Radek
patent: 4442630 (1984-04-01), Radek

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