US 4,785,713 AGranted

Driving device, in particular for a proportioning pump of the piston-flowmeter type

OwnerJean Cloupinventor

Life of this patent

Estimating the term…

Abstract

In a driving device of the piston-flowmeter type, in particular for a proportioning pump, a distributor is mounted at one end of a piston cylinder for controlling the admission and discharge of fluid within two chambers formed respectively on each side of the piston. The distributor body is provided with circular flow passages and two pairs of valve-seats in cooperating relation with two seals of a two-position tubular valve. The valve has a central bore traversed by the piston rod and coupled to a resilient bistable mechanism for reversing the state of the valve and maintaining it in either of its two positions.

Claims7

Dependent claims

A driving device of the piston-flowmeter type, in particular for a proportioning pump, said device comprising:

a cylinder;
a piston slidably mounted within said cylinder, and provided with at least one motion transmission rod, said piston dividing said cylinder into first and second chambers located on each side of said piston;
a two-piston four-way distributor controlled by said rod and piston so that, in a first position, a communication is established between said first chamber and a supply of fluid under pressure while communication is established between said second chamber and an outlet nozzle and so that, in a second position, a communication is established between said second chamber and said fluid supply while a communication is established between said first chamber and said outlet nozzle;
said distributor being provided with a body having two pairs of fixed valve-seats located in concentric relation to a direction which is coaxial with said transmission rod and a tubular valve traversed by said rod, said tubular valve being provided at the ends thereof with two peripheral seals for cooperating alternately with each pair of fixed valve-seats, said tubular valve cooperating in tightly applied relation with at least one valve-seat of each said pair, which valve-seat constitutes an end-of-travel stop for said tubular valve;
two fixed abutments;
a slide-block assembly mounted on said rod and abuttable with said two fixed abutments;
a bistable resilient mechanism coupling said slide-block assembly to said tubular valve, said bistable resilient mechanism having a point of reversal which tends to move said tubular valve away from said slide-block assembly in a first position and to move said tubular valve towards said slide-block assembly in a second position;
two abutments rigidly fixed to said rod in order to move said slide-block assembly in the vicinity of top and bottom dead centers of said piston away from a bearing surface of said slide-block on which a respective abutment is applied by said bistable resilient mechanism and to cause displacement of said slide-block assembly until it passes beyond said point of reversal of said bistable resilient mechanism.

5 more elements

Dependencies are inferred from the claim text.

patentgrep

Loading patent…

Abstract

A driving device of the piston-flowmeter type, in particular for a proportioning pump, said device comprising:

a cylinder;
a piston slidably mounted within said cylinder, and provided with at least one motion transmission rod, said piston dividing said cylinder into first and second chambers located on each side of said piston;
a two-piston four-way distributor controlled by said rod and piston so that, in a first position, a communication is established between said first chamber and a supply of fluid under pressure while communication is established between said second chamber and an outlet nozzle and so that, in a second position, a communication is established between said second chamber and said fluid supply while a communication is established between said first chamber and said outlet nozzle;
said distributor being provided with a body having two pairs of fixed valve-seats located in concentric relation to a direction which is coaxial with said transmission rod and a tubular valve traversed by said rod, said tubular valve being provided at the ends thereof with two peripheral seals for cooperating alternately with each pair of fixed valve-seats, said tubular valve cooperating in tightly applied relation with at least one valve-seat of each said pair, which valve-seat constitutes an end-of-travel stop for said tubular valve;
two fixed abutments;
a slide-block assembly mounted on said rod and abuttable with said two fixed abutments;
a bistable resilient mechanism coupling said slide-block assembly to said tubular valve, said bistable resilient mechanism having a point of reversal which tends to move said tubular valve away from said slide-block assembly in a first position and to move said tubular valve towards said slide-block assembly in a second position;
two abutments rigidly fixed to said rod in order to move said slide-block assembly in the vicinity of top and bottom dead centers of said piston away from a bearing surface of said slide-block on which a respective abutment is applied by said bistable resilient mechanism and to cause displacement of said slide-block assembly until it passes beyond said point of reversal of said bistable resilient mechanism.

5 more elements