| 摘要 |
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.
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