Importance

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Abstract

Pump assembly includes a rotatable handle with integral cams thereon to releasably retain the pump assembly within a receiver. During assembly, the pump assembly is initially inserted only part way into the receiver to a first intermediate non-operating position and then rotated a part turn to cause the cams on the handle to be engaged inside receiver lugs on the receiver housing which retain the pump assembly in a second intermediate non-operating position for pump drainage. While in such second intermediate non-operating position, the handle may be rotated between closed and open positions to respectively push the pump assembly further into the receiver to an operating position and pull the pump assembly back out to the second intermediate non-operating position. Seal means between the pump assembly and receiver are respectively engaged and disengaged during camming movement of the pump assembly between such operating and non-operating positions. Also, one or more valve means are respectively opened and closed during each camming movement of the pump assembly between such operating and non-operating positions. The handle may be trapped in the closed position by an electrical connector which is adapted to be connected to the outer end of the pump assembly to provide power to operate the pump assembly. A cover plate may be used to cover an access opening to the pump assembly when the pump assembly is in the operating position within the receiver. The handle assembly will permit attachment of the cover plate to the access opening only when the pump assembly is in the operating position and the handle is in the closed position.

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First Claim