Abstract A dosing syringe has a cylindrical syringe body which at its tapering end has a dispensing orifice and at its other end a stepped cylindrical enlargement with two opposing handles. A recess is located below each handle, and a piston is inserted into the cylindrical syringe body. The piston is in contact with a dosing plunger having an external thread. Two threaded sides are arranged around the plunger and each threaded side has a positioning projection introduced into the recesses of the enlargement. According to the invention, the piston is connected to the dosing plunger by a spring retainer connection and the threaded sides have an outside groove in which an O-ring is inserted in countersunk fashion to hold the two threaded sides together. As a result, the piston-dosing unit can be prefabricated and introduced as a complete unit including the threaded sides into the enlargement of the syringe body where it is fixed simplifying the production technology of the dosing syringe.
A dosing syringe comprising a cylindrical syringe body having a tapering end with a dispensing orifice therein, a stepped cylindrical enlargement, two opposing handles connected to and extending from the cylindrical enlargement, two opposing recesses in the cylindrical enlargement one underneath each handle, a piston inserted into the cylindrical syringe body from the enlarged end thereof, two retainer sides each having an internal thread, and a dosing plunger having an external thread, the dosing plunger being rotatably arranged in the two-part retainer sides with the threads engaging one another and the two retainer sides positioned in the enlargement of the syringe body, each retainer side having a positioning projection fitted into the recesses in the enlargement, a spring retainer connection releasably connecting the piston to the dosing plunger, each of the retainer sides having an outside groove, and an O-ring in the groove holding the two retainer sides together, and wherein the retainer sides are slightly spaced apart forming a pair of gaps 180° from each other, and a longitudinal rib on the plunger constructed and arranged to fit into one of the gaps and to be movable to the other gap upon 180° rotation of the dosing plunger.
Claim 2
Dependent Claim
199 words
A dosing syringe comprising a cylindrical syringe body having a tapering end with a dispensing orifice therein, a stepped cylindrical enlargement, two opposing handles connected to and extending from the cylindrical enlargement, two opposing recesses in the cylindrical enlargement one underneath each handle, a piston inserted into the cylindrical syringe body from the enlarged end thereof, two retainer sides each having an internal thread, and a dosing plunger having an external thread, the dosing plunger being rotatably arranged in the two-part retainer sides with the threads engaging one another and the two retainer sides positioned in the enlargement of the syringe body, each retainer side having a positioning projection fitted into the recesses in the enlargement, a spring retainer connection releasably connecting the piston to the dosing plunger, each of the retainer sides having an outside groove, and an O-ring in the groove holding the two retainer sides together, and wherein the retainer sides are slightly spaced apart forming a pair of gaps 180° from each other, and a longitudinal rib on the plunger constructed and arranged to fit into one of the gaps and to be movable to the other gap upon 180° rotation of the dosing plunger.