Abstract A double acting hydraulic pump and air motor therefor including means for controlling the inlet and exhaust of air to and from the opposite sides of the piston in the air cylinder. The pump has a stepped diameter housing including an upper pump cylinder defining an outlet chamber for liquid and a lower pump cylinder received within the upper pump cylinder and defining an inlet chamber for liquid. A pump piston reciprocates in the two cylinders and is slidably received in two axially spaced stationary packing sleeves having a resilient spacer sleeve interposed axially therebetween. The spacer sleeve is formed of metal sheet adapted to deflect resiliently under load. The upper end of the upper pump cylinder is received within a recess in the lower end of the air motor housing. A retainer plate connected to the lower end of the air motor housing is provided with an opening to allow passage of the upper end of the upper pump cylinder and a pair of radially extending ears thereon. The pump housing is rotatable about its own longitudinal axis to align or misalign the ears and the opening and retain the pump housing to or release it from the motor housing.
A hydraulic pump comprising an upper pump cylinder defining an outlet chamber for liquid, a ledge on said cylinder projecting radially into said outlet chamber at the lower end thereof, a lower pump cylinder defining an inlet chamber for liquid of lesser diameter than said outlet chamber, said lower cylinder having a radially outwardly extending flange seated on said ledge to connect said lower cylinder to said upper cylinder, a pair of axially spaced packing sleeves sealing the upper and lower ends of said outlet chamber, the lower of said packing sleeves being seated on said flange in sealing engagement therewith and closing the lower end of said outlet chamber, means holding said packing sleeves in spaced relation, and a piston of slightly smaller diameter than said inlet chamber and substantially smaller diameter than said outlet chamber reciprocable within said upper and lower cylinders and adapted to pass from one to the other of said chambers in slidable sealing contact with said lower packing sleeve to pump liquid into said inlet chamber and out of said outlet chamber.
Claim 2
Dependent Claim
178 words
A hydraulic pump comprising an upper pump cylinder defining an outlet chamber for liquid, a ledge on said cylinder projecting radially into said outlet chamber at the lower end thereof, a lower pump cylinder defining an inlet chamber for liquid of lesser diameter than said outlet chamber, said lower cylinder having a radially outwardly extending flange seated on said ledge to connect said lower cylinder to said upper cylinder, a pair of axially spaced packing sleeves sealing the upper and lower ends of said outlet chamber, the lower of said packing sleeves being seated on said flange in sealing engagement therewith and closing the lower end of said outlet chamber, means holding said packing sleeves in spaced relation, and a piston of slightly smaller diameter than said inlet chamber and substantially smaller diameter than said outlet chamber reciprocable within said upper and lower cylinders and adapted to pass from one to the other of said chambers in slidable sealing contact with said lower packing sleeve to pump liquid into said inlet chamber and out of said outlet chamber.
Claim 3
Dependent Claim
40 words
A pump as claimed in claim 1 wherein said spacing means includes a resilient spacer sleeve in said outlet chamber interposed axially between said packing sleeves, said spacer sleeve being formed of metal sheet adapted to deflect resiliently under load.