Small reciprocating pump

Abstract

In a small reciprocating pump, an annular space is provided between a cylinder and a cylinder block. The cylinder is bifurcated at its upper end, and has two projecting edges. One of these projecting edges is radially outwardly spaced apart from the other, and greater in length than the other. A cylinder head has a lower surface provided with an annular groove in which the outer projecting edge of the cylinder is engaged. A seal ring is disposed in this annular groove, and another seal ring between the projecting edges of the cylinder to maintain the cylinder in gastight contact with the cylinder head. The other seal ring also serves to support a metal plate which forms therein a valve. The cylinder head is provided with an intake passage having an intake valve, and a discharge passage having a discharge valve. The cylinder block is connected to a crank case in a gastight fashion. A crankshaft is supported rotatably in the crank case for reciprocating a piston in the cylinder.

Dependencies are inferred from the claim text.