Pump for hand-held dispensers

US4010874A · kind A · utility

Inventor

• Wolf Steiman · Bridgeport, US

Key dates

• Filing date: Jun 26, 1975
• Grant date: Mar 8, 1977
• Expiry date: Jun 26, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05B11/1023
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A pump construction for hand-held dispensers and the like, wherein a hollow plunger that is reciprocatively mounted at the top of a cylinder, slidably carries a hollow piston which is movable on the plunger between high and low positions thereon. The plunger has at its lower end a valve head which is engageable with an annular bearing seat at the lower end of the piston to seal off the passage through the piston when the latter is in its lower position on the plunger. When the piston is in its high position on the plunger, the valve head no longer seals the piston and the liquid product can flow past the valve head and through the piston and plunger, to be discharged from a spray head or orifice member at the top end of the plunger. For the high position of the piston on the plunger, cooperable valve portions of these parts become engaged to seal off the upper end of the piston so as to prevent leakage of liquid past the same. During depressing movement of the plunger and piston in the cylinder, a venting valve comprising cooperable portions of the piston and a bearing bushing becomes open, to allow influx of air into the container through a side opening in the wall of the cylinder…