US150262A - Improvement in caps for glass syringes - Google Patents

Description

P'. F. SLAVIN.

Caps for Glass Syringes.

Patented April 28, 1874.

LWITNESSES W/ ATTUBNEYS.

UNITED STATES PATENT QFFIOE.

PATRICK F. SLAVIN, OF NEW YORK, N. Y.

IMPROVEMENT IN CAPS FOR GLASS SYRINGES.

Specification forming part of Letters Patent No. 150,262, dated April 28, 1874; application filed April 4, 1874.

To all whom it may concern:

Be it known that I, PATRICK F. SLAVIN, of the city, county, and State of New York, have invented a new and useful Improvement in Gap for Glass Syringes, of which the following is a specification:

The figure is a side view, partly in section, of a glass syringe to which my improved cap has been applied, the cap being also shown in section.

My invention has for its object to furnish an improved cap for glass syringes, which shall be so constructed that it cannot be pushed into the barrel of the syringe, and which shall at the same time be convenient in use. The invention consists of the cap formed of the cork, and the metallic tube having a flange formed upon its upper end, the end of which is spun over to clasp the upper end of the said cork and form a lip, and having the lower end spun outward to overlap the inner end of the said cork, as hereinafter'fully described.

A represents the barrel, and B the pistonrod of the syringe, about the construction of which there is nothing new. 0 is a cork of such a size as to fit into the barrel A, and which has ahole formed longitudinally through its center for the passage of the piston-rod B. D is a tube, which is passed through the hole through the cork O, and which is made of such a size that the piston-rod B can work in it freely. Upon the upper end of the tube D is formed a flange of such a size that its edge may project a little beyond the sides of the cork. The edge of the top flange of the tube D is spun over, so as to be turned against and clasp the upper part of the cork O, as shown in the figure. The lower end of the tube is spun out, so as to overlap the inner end of the cork (l, as shown in the figure.

By this construction the parts 0 D of the cap will be securely and permanently fastened together in such a way as not to interfere with the proper operation of the cork 0, while the lip formed at its upper end rests against the edge of the barrel A, and prevents the possibility of the cap beingpushed into the barrel A, which, when it happens, allows the piston to strike against the shoulder of the syringe and break it. The flanged or spun-out lower end of the tube D, which overlaps the inner end of the cork G, prevents the possibility of the said tube being drawn out of the cork 0, should said cork be compressedby beingforced into a syringe a little too small.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The syringe-cap G D, formed of the cork O and the metallic tube D, having afiange formed upon its upper end, the edge of which is spun over to clasp the upper end of the said cork (J and form a lip, and having its lower end spun outward to overlap the inner end of the said cork O, substantially as herein shown and described.

PATRICK F. SLAVIN. Witnesses:

JAMES T. GRAHAM, T. B. Mosnnn.

Images