专利名称：DOUBLE-ACTING TANDEM PISTON PUMP 发明人：ROLAND E. SHADDOCK
汽车销售话术申请号：US3700360D
申请日：19710823
公开号：US3700360A
公开日：
呼啦圈可以减肥吗
鲜花玫瑰
19721024
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天女花>散文诗二首教案摘要：A high pressure tandem piston pump reciprocated by pressured oil from a vehicle engine driven hydraulic pump to surge water at high pressure from a vehicle tank or other source through a ho and nozzle to create a jumping action or jack hammer driving of the nozzle forcing it through and around obstructions in a wer pipe. The engine driven pump pumps oil to opposite sides of one of the pistons of the tandem pump causing it to reciprocate the piston for high pressure surging delivery of water. Oil flow to opposite sides of the driving piston to is controlled from a valve tripped by a switch which is actuated by a control rod slidable in a recess of the connecting rod between the two pistons of the tandem pump and arranged to be pushed to a switch tripping position at one end of the stroke of the pump admitting high pressure oil which further ejects the control rod and holds it in an extended position until pulled to a retracted locked position at the opposite end of the stroke of the pump permitting the switch to again be tripped for reversing the flow from the engine driven pump.蒙嘉慧
申请人：MYERS-SHERMAN CO.
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