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Hose coupling unit for refrigerant system

  • US 5,074,332 A
  • Filed: 08/16/1990
  • Issued: 12/24/1991
  • Est. Priority Date: 08/16/1990
  • Status: Expired due to Term
First Claim
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1. A coupling unit adapted for connecting a flexible evacuation hose and/or refrigerant supply hose to an air conditioning or refrigeration system having a valve fitting enclosing a normally closed movable valve stem, said coupling unit comprising a body defining a chamber and having an axis, manually actuated coupler means for releasably connecting said body to the valve fitting, a valve member supported within said chamber for axial movement, said valve member being movable between a retracted position and an extended position where said valve member is effective to open the valve stem within the valve fitting when said body is connected to the fitting, a manual actuating lever supported by said body for movement between a released position and a locked position, means connecting said actuating lever to said valve member and effective to move said valve member between said retracted and extended positions in response to movement of said actuating lever between said released and locked positions, said actuating lever including spaced side portions receiving said body therebetween, a pair of opposing cam members rotatably supported by said body and having corresponding eccentric cam portions engaging said valve member, and interlock means for blocking operation of said coupler means when said actuating lever is in said locked position to avoid disconnecting said coupling unit from the valve fitting when said valve member is in said extended position and the valve stem is open.

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