Injector
First Claim
Patent Images
1. An injector comprising:
- a hollow cylinder having an injection point at one end and a rear end surface at another end thereof;
a circular column-like plunger having a sealing portion at an end thereof fitted to the inside of said hollow cylinder for axial movement therein;
a plurality of convex/concave spaced apart portions formed in a row extending in an axial direction on an outer peripheral surface of said plunger; and
a stopper member arranged to engage said rear end surface of said hollow cylinder and having a cylindrical opening therein, said stopper member being mounted on said outer peripheral surface of said plunger for axial and rotational movement thereon and being provided at said opening with at least one inwardly facing projection extending over a portion of its inner circumference so as to engage said convex/concave portions of said plunger;
said stopper member being rotatably movable to a position whereat said projection does not engage a convex/concave portion of said plunger and in such position being axially movable on said plunger without rotation to a position whereat said projection is adjacent a selected convex/concave portion, and then rotatably positioned so that said projection will engage said selected convex/concave portion to thereby set a limit on axial movement of said plunger in said cylinder.
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Accused Products
Abstract
An injector such as a hypodermic syringe and the like is improved in that an amount of injection each time thereof is mechanically determined by provisions of a stopper disconnectably attached to the barrel of the plunger and a plurality of convex/concave portions provided integrally on the outer surface of the plunger and cooperating with the stopper so that the stopper acts as a limiter for an advancing movement of the plunger in the cylinder of the injector to determine the amount of each injection of the injector.
55 Citations
9 Claims
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1. An injector comprising:
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a hollow cylinder having an injection point at one end and a rear end surface at another end thereof; a circular column-like plunger having a sealing portion at an end thereof fitted to the inside of said hollow cylinder for axial movement therein; a plurality of convex/concave spaced apart portions formed in a row extending in an axial direction on an outer peripheral surface of said plunger; and a stopper member arranged to engage said rear end surface of said hollow cylinder and having a cylindrical opening therein, said stopper member being mounted on said outer peripheral surface of said plunger for axial and rotational movement thereon and being provided at said opening with at least one inwardly facing projection extending over a portion of its inner circumference so as to engage said convex/concave portions of said plunger; said stopper member being rotatably movable to a position whereat said projection does not engage a convex/concave portion of said plunger and in such position being axially movable on said plunger without rotation to a position whereat said projection is adjacent a selected convex/concave portion, and then rotatably positioned so that said projection will engage said selected convex/concave portion to thereby set a limit on axial movement of said plunger in said cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification