US 565480 A
Description (OCR text may contain errors)
' J. A. MALO'NEY.
No. 565,480. Patented Aug. 11, 1 896.
a m/MW. I
%m/mm. /WJ'/MW7 'WMWM I UNITED STATES PATENT OFFICE.
JAMES A. MALONEY, OF W'ASI-IINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO BENJAMIN S. MINOR, OF SAME PLACE.
SPECIFICATION forming part of Letters Patent No. 565,480, dated August 11, 1896.
Application filed April 13, 1896. Serial No. 587,341. (No model.)
To all whom it may concern.-
Be it known that I, J AMES A. MALONEY, a citizen of the United States, and a resident of Washington, in the District of Columbia, have invented certain new and useful Im provements in Syringes and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.
Figure 1 of the drawings is a vertical longitudinal section of the invention. Fig. 2 is a detail view of the cap. or plug, and Fig. 3 is a detail view of the piston.
This invention is designed to provide a syringe wherein the use of valves, pistonrods, and packings of all kinds is entirely done away with, which is extremely simple in construction and effective in operation, and can be manufactured at a low cost, and which, owing to the absence therefrom of all parts which in ordinary syringes are the most subject to wear and impairment, is durable and not likely to get out of order.
With these objects in view the invention consists in the novel construction and combination of parts, all as hereinafter described, and pointed out in the appended claim.
Referring to the accompanying drawings, the letter A designates the syringe tube or cylinder, which is of the usual character, and has at one end the usual tapered and contracted nozzle a. The other end of the cylinder has a cap or plug B, through which is formed a small orifice b. In the drawings I have indicated a plug, preferably of soft rubher, which is inserted in the end of the tube or cylinder, but I desire to state that an orificed cap or plug of any suitable character may be employed.
O designates an ordinary rubber bulb,which is secured on the capped or plugged end of the tube or cylinder in the usual manner, that is to say, by means of a grooved annulus, boss, or bead c, with which the lips of its neck engage.
D designates the piston, which consists of a Short cylinder of hard rubber, glass, or other suitable material capable of taking a smooth or polished surface such as will cause it to have very little friction upon the inner surface of the glass, hard rubber, or other material of which the tube or cylinder A is composed. This cylinder is preferably of the form shown, that is to say, hollow, with its open end toward the cap or plug B and its closed end toward the nozzle or discharge. A solid cylinder-pistonmay, however, be employed, but less efficiently. The diameter of the piston is such that it will fit snugly in the tube or cylinder, so as to move freelyand yet form a reasonably-close joint with the wall thereof.
The operation will be readily understood. When the bulb is compressed, the piston is forced against the liquid charge, which it 1 ejects with a force proportionate to the degree of pressure exerted on the bulb. When the bulb is released, the piston is drawn back to the cap or plug B by the suction as the bulb fills. At the same time, if desired, a new charge is drawn into the syringe.
i In order that the piston may have a stroke equal to the length of the tube or cylinder A,
exclusive of the nozzle portion, the capacity of the bulb should be about equal to or a little greater than that of the tube, so that when the said bulb is compressed nearly or quite to its full limit and the air therein is expelled into the tube A the volume of this air will be sufficient to force the piston to the full limit of its throw. Likewise the return of the air into the bulb as the latter expands will return the piston to its opposite limit.
If a soft-rubber plug B is employed, it will form a cushion for the piston upon its return, should the action of the bulb be somewhat stronger than above indicated.
An advantage arising from the use of this piston over the old form of syringes, wherein a bulb is used upon the end of the tube without any piston, is that the action is much more positive, that is to say, the full force of the air exhausted from the bulb upon its compression is utilized, instead of being partially dissipated through the liquid, so that a much stronger discharge is obtained from the nozzle.
Another important advantage is that the piston forms a guard which prevents any of the contents of the syringe from entering the bulb. This is especially important where a syringe is used With medicated liquids containing oil or other substances having a softening or deleterious effect upon the rubber of the bulb.
The syringe is extremely sensitive in its action, and by proper manipulation of the bulb the force of the discharge can be accurately controlled by the operator. It can also be used advantageously for dropping.
Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is-
A syringe comprising a tube or cylinder 15 having a nozzle at one end, and an orificed plug or cap at its opposite end, a bulb secured on the capped or plugged end, and a loose piston, consisting of a hollow cylinder closed at the end nearest the nozzle, and open at its 20 opposite end substantially as specified.
In testimony whereof I affix my signature in presence of two Witnesses.
JAMES A. MALONEY.
GEORGE II. PARMELEE, G. M. ANDERSON.