Improvements in or connected with hypodermic syringes / [James Ernest Arnold].

  • Arnold, James Ernest.
Date:
1904
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in or connected with hypodermic syringes / [James Ernest Arnold]. Source: Wellcome Collection.

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    N° 1261 A.D.1904 Date of Application, 18th Jan,, 1904 Complete Specilication Left, 3rd Sept., 1904—Accepted, 6th Oct., 1904 PROVISIONAL SPECIFICATION. i Improvements in or connected with Hypodermic Syringes. I, James Ernest Arnold, of the Firm of Arnold & Sons, of 31, West Smith- field, in the City and County of London, Instrument Makers* do hereby declare the nature of this invention to be as follows; — The primary object of this invention is to provide an improved construction 5 of syringe, in which the glass barrel shall be partially encased and guarded by a pierced or slotted sleeve, and at the same time to employ the said sleeve to maintain the two end caps upon the barrel, while allowing of the ready detachment of the guard sleeve and the said end caps to facilitate the taking to pieces of the syringe. 30 To this end 1 fit the caps to the ends of the barrel so as to be readily detach¬ able therefrom, for instance, the cap formed with the nozzle for receiving the needle may be fitted by the end of the barrel being ground to fit into the cap, while the opposite cap (which may if desired be iorrned with huger clips and through which cap the piston rod passes)—can be fitted frictionally upon its end 15 of the barrel. It is obvious that so constructed, the caps can be quite readily removed by simply being pulled off from the ends of the barrel, and I then provide a preferably metal sleeve, through one end of which the syringe is passed until the smaller end of the nozzle cap passes through the shouldered end of this tubular sleeve and the cap is supported against that end. The cap SO through which the' piston rod passes is then embraced by the end of the tubular sleeve, and that end of the sleeve is secured to the said cap by some convenient attachment which will enable the sleeve to be readily disengaged and removed when required. As an example of an attachment device which I have found to answer well 25 in practice, I provide a bayonet-joint slot in the end of the tubular sleeve and a pin on the exterior surface of the rear metal cap, which pin enters the bayonet slot of the tubular guard, and by partially rotating the said guard the two end caps are drawn together and securely maintained in their proper posi¬ tions upon the ends of the barrel. 30 With such a construction, in order to take the syringe to pieces for cleaning or other purposes, it is only necessary to give the tubular guard a slight ,axiai rotation relatively to the rear end cap, to disengage the pin from the bayonet slot, when the guard can be drawn off endwise and the caps, so released, readily removed. The replacement and putting together of the parts of the syringe 35 can be effected with equal facility by a reversal of the aforesaid operations. The bayonet slot in the end of the tubular sleeve may, and preferably is, slightly inclined so that when the pin on the end cap has entered the inclined portion of the slot, the axial rotation of the tubular sleeve will tend to draw the two end caps on to the barrel. 40 Dated this 18th day of January 1904. [Price 8d.] BREWER & SON, London and Leeds, Agents for the Applicant.