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Automatic injecting gun for remote controlled vaccination of cattle, pigs, and animals in general

  • US 4,186,741 A
  • Filed: 12/02/1977
  • Issued: 02/05/1980
  • Est. Priority Date: 12/13/1976
  • Status: Expired due to Term
First Claim
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1. An injecting gun for controlled vaccination of cattle, pigs and animals in general, comprising a supporting box-like gun body having an extension in the form of a handle, an injector assembly supported by said box-like gun body, said injector assembly having a hollow elongated cylinder member with a cylinder cavity having an open ended portion thereof fixed on said box-like body and facing the interior thereof and an opposite end portion thereof projecting outside said box-like body, said opposite end portion having connector means for selectively connecting thereto needle means and auxiliary elongation members, a hollow plunger member with a head portion and a plunger cavity and slidable within said cylinder cavity, a first check valve structure within said cylinder cavity arranged in a position more remote from said open end of the cylinder member than said plunger head portion to define therebetween a cylinder chamber the length whereof being defined by the actual position of said plunger member, a second check valve structure in the head portion of said plunger member, said first check valve structure controlling the flow of vaccination liquid from said chamber towards said opposite end portion of the cylinder cavity and vice versa to prevent such flow when the liquid pressure in said opposite end portion cavity is higher than the liquid pressure in said cylinder chamber and to allow such flow when the pressure conditions are reversed, said second check valve structure controlling the flow of vaccination liquid from said cylinder chamber towards said plunger caivty and vice versa to prevent liquid passage from said cylinder chamber towards said plunger cavity when the liquid pressure within said cylinder chamber is higher than the liquid pressure within said plunger cavity and to allow such passage when the pressure conditions are reversed, duct means for connecting the plunger cavity with a source of vaccination liquid, adjustable limit stop means for said plunger to adjust the maximum volume of said cylinder chamber and trigger means and rechargeable springed release means for said plunger member to actuate the injection action of said plunger member, when said trigger means are triggered.

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