초록 ▼

The invention is concerned primarily with a piston action pump/syringe usable for veterinary work in particular (but not confined to this use) for the dispensing of metered doses of liquids or pastes, and includes a cylindrical body reciprocally housing a piston end of a co-axial plunger which exten

The invention is concerned primarily with a piston action pump/syringe usable for veterinary work in particular (but not confined to this use) for the dispensing of metered doses of liquids or pastes, and includes a cylindrical body reciprocally housing a piston end of a co-axial plunger which extends outwardly from the body, the plunger and piston end having a common bore through which the body contents can be dispensed. The outlet end of the plunger, which is provided with a nozzle, has a novel one way valve permitting egress of the body contents and the end of the body remote from the plunger has a novel one way inlet valve for ingress of liquid or paste from a connected supply source. Preferably the invention includes an operating hand grip for the pump/syringe of one piece plastics construction.

대표청구항 ▼

A piston action pump/syringe for liquids comprising a cylindrical tubular body reciprocally housing a piston end of a co-axial plunger which extends outwardly from said body, said plunger and piston end having a common bore through which the body contents can be dispensed and the outlet end of said

A piston action pump/syringe for liquids comprising a cylindrical tubular body reciprocally housing a piston end of a co-axial plunger which extends outwardly from said body, said plunger and piston end having a common bore through which the body contents can be dispensed and the outlet end of said plunger having a one way valving means including a movable sleeve or skirt part located about said outlet end and an outlet thereof so as to permit egress only of said body contents, and the end part of the body remote from the plunger being provided with one way valving means for ingress only of liquid to the body from a supply source, said body valving means including an elongate member loosely housed in an enlarged bore for longitudinal reciprocal movement between a non-sealable small valve opening to the body interior at one end and a valve opening at the opposite end communicating with a liquid supply source and sealable by the respective elongate member end on the body contents\being pressurised by inward movement of the plunger, outward movement of the plunger relative to the body causing suction therewithin to draw the elongate member off the valve opening to the supply source and towards the non-sealable opening and permit liquid from the supply source to by-pass the elongate member into the body.