F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/139, 277/38
F04B 21/00 (1980.01)
Patent
CA 1059372
ABSTRACT OF THE DISCLOSURE A metering pump including a pump body having a bore for receiving a flowable composition to be dispensed, feed in- let means communicating with the bore, and spaced outlet means including a check valve, for discharging the composition. A pressure chamber is defined intermediate the pump inlet and out- let. The chamber has an inlet, and an outlet communicating with the pump outlet through the check valve. A piston is mounted for axial reciprocation in the bore between a first position at which the piston is withdrawn from the pressure chamber inlet, and a second position at which the piston passes at least par- tially into such inlet. The pressure chamber inlet is bounded by sealing means including an annular sealing surface which con- verges in the direction of the pressure chamber, to a diameter less than that of the piston, whereby the surface may slidingly engage and seal with the piston upon the latter entering the pressure chamber. The sealing surface is elastically dilateable away from the axis of the bore, to maintain the seal about the piston during its entry and withdrawal from the pressure chamber and to enable compensation for wear. At least one other surface of the sealing means is accessible to the pressure chamber in- terior, and is elastically coupled to the backside of the sealing surface. In consequence, the increasing pressure developed by movement of the piston into the pressure chamber, acting through the accessible surface, increases the sealing forces between the sealing surface and piston.
316759
Hardman James V.
Wolfrom Norman S.
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