US1236513A - Tire-pump. - Google Patents

Description

W. U. WATSON.

TIRE PUMP.

APPLICATION FILED MAR-6,1917- 1,2,513. Patented Aug. 14, 191?.

r a citizen of the United States,

WILLIAM U. WATSON, OF CHICAGO, ILLINOIS.

TIRE-PUMP.

Specification of Letters Patent.

Patented Aug. 14L, 1917.

Application fi1ed March 6, 1917. Serial No. 152,583.

To all whom it may concern:

Be it known that I, WILLIAM U. WATSON, residing at Chicago, in the county of Cook and State of Illinois have invented a certain new and useful. Improvement in Tire Pumps, of which the following is a specification.

My invention relates to tire pumps, more particularly compound pumps adapted to be operated by hand for forcing air into vehicle tires. Tire pumps have been made with a high and a low pressure cylinder side by side, but in the pumps heretofore constructed, the castings or fittings for the upper ends of the cylinders have required a good deal of tooling of one kind or another including boring, turning and threading. The object of my invention is to simplify the construction of the parts at the upper end of the cylinders and dispense with a great portion of the tooling or machine work. The manner in which this is accomplished will become evident as the description proce'eds.

I accomplish my object by the construction shown in the accompanying drawings, in which:

Figure 1 is an assembly view from the side showing the complete pump, part of the central portion being broken away to render the view more compact.

Fig. 2 is a side elevation, chiefly in section, on the line 2-2, Fig. 4. It shows the parts at the upper end of the cylinders.

- Fig. 3 is a side elevation, partly in section, on the line 3-3, Fig. 4:.

Fig. 4 is a plan section on the line 44, F 1

Fig. 5 is a perspective view of the part which I shall term the plug, and

Fig. 6 is a perspective View of the part which may for convenience be termed the pump head.

Similar numerals refer to similar parts throughout the several views. 7

Referring to the accompanying drawings, the low pressure cylinder 1 and high pressure cylinder 2 are mounted side by side upon a base 3, which is preferably of cast metal and broad enough to be bolted to the floor or to support the foot of the operator so that the pump may be held stationary while being operated. The two cylinders are connected together through the base by means of a sultable connecting aperture (not shown),

particularly with the .1 and 2. sure cylinder rod. By preference, low pressure cylinder is notched to receive a lug 8 formed on the inside of flange 8.

Plunger rods 4 and 5 operate suitable plungers within the respective cylinders, and these rods are operated by a handle 6. It will be understood that the plunger in the low pressure cylinder is so constructed that the high pressure cylinder. On the down stroke, however, it will permit air to pass it to receive a new charge above it in the high pressure cylinder.

My present invention is concerned more pump head and plug which are shown separately in Figs. 5 and 6.

The pump head which I will denote in general by A, consists of a single casting of composite form. It has an annular flange 6 which fits over the upper end of the low pressure cylinder as best shown in Figs.

It covers the top of the low presand seats thereon. It has a central aperture 9 for accommodating the plunger rod l. The diameter of this aperture is great enough to freely admit air into the cylinder during the down stroke of the plunger, but in the preferred construc tion the diameter of the aperture is not so great as to prevent the pump head from guiding, to a certain extent, the plunger the upper end of the The upper end of the high pressure cylinder is approximately flush with the upper end of the low pressure cylinder, but at a point preferably about an inch below its upper end, the high pressure cylinder has an external annular bead 10 formed in it. It will be understood that in the preferred construction, both of the cylinders are made of steel tubing and this bead may be formed by a rolling process or any other method known in the art. Said bead forms a support or abutment for the overlying portion ,of the pump head. The pump head has an integral barrel 12 which descends to the upward in level of the bead 10 and there has an inwardly projecting annular ledge 13 which overlies and is supported by said bead. It is good practice to interpose a washer 1i between the bead and the pump head, as best shown in Figs. 1, 2 and 3. The presence of the ledge 13 produces an annular well or chamber 16 between the inside of the barrel 12 and the outside of the high pres sure cylinder. This well alfords space for receiving the barrel 18 of the plug which is denoted in general by the reference letter B. Barrel 18 is internally threaded so as to screw upon the externally threaded upper end of the high pressure cylinder. The plug is manipulated by a nut 19 integral with it; and between the nut and the barrel there is formed a laterally extending annular flange 20 which, when the plug is screwed down bears upon the upper surface of the pump head or upon a washer 21 overlying it. The plug is centrally apertured to accommodate the plunger rod 5, and in order to prevent the escape of air, a stufling nut 22 is screwed into the top of the plug surrounding the rod.

The pump has a passage 25 leading from the well 16 to a screws a hose connection 27. A port 28 is formed in the side of the high pressure cylinder for permitting the compressed air to flow from the high pressure cylinder to the passage 25 and thence out through the hose connection.

With my construction, the assembling of the parts is a very simple matter. After the two cylinders have been screwed or otherwise fastened into the base 3 the rods l, 5 with plungers detached are passed down through the head A and plug B and stuffing nut 22, after which the plungers are attached to the rods and then inserted into the respective cylinders. The head A is then slipped down over the top of the cylinders. The barrel of the plug B is then dropped into the well 12 of the pump head. As soon as the barrel has reached the top of the high pressure cylinder, it is screwed down onto it until the annular flange 20 bearing upon'the top of the pump head forces the pump head down firmly onto the bead 10. The stufiing nut 22 is then applied in the ordinary manner, after which the handle 6 is fastened in place and the assembly is complete.

It will be evident from the foregoing that when thus assembled the parts will be held very firmly together and leakage will be effectively prevented at the top of the high pressure cylinder. The pump head will be adequately secured also to the top of a low pressure cylinder, but it is obvious that an air tight connection is not required at this point. Viewing the construction as a whole, it will be seen that as a result of my invention, the cylindersare held in proper relative positions, and are adequately closed and the tapped hole 26 into which two plunger rods adequately guided by but two principal parts, viz: the pump head A and plug 13. This is very much simpler than any construction heretofore accomplished, and, as a result of this simplified construction and combinative arrangement of parts which are usually made in separate pieces, I am able to dispense with a number of machining operations. In the first place, the configuration of the parts is so simple that, instead of machining them, they may with propriety be employed just as they are cast-that is to upon what is commonly termed a foundry fit. Practically the only machine work required is the formation of the bead 10 and the thread cutting on the outside of the high pressure cylinder and the inside of the barrel 18 of the plug.

Having thus described my invention, what I claim as new and desire to secure-by Letters Patent, is: l

1. An air pump having two cylinders open at the uppenend, a pump head configurated to fit over the ends of both of said cylinders, one of said cylinders having a projection formed at a point somewhat beneath its upper end, said projection forming a seat for the pump head, and the pump head having a well surrounding the upper end of the last mentioned cylinder, and means screwing onto the threaded upper end of the last mentioned cylinder and overlying the top of the pump head for holding the parts assembled.

2. An air pump having a high and a low pressure cylinder, a beading formed somewhat below the delivery end of the high pressure cylinder, a pump head fitting over the low pressure cylinder and having a well encircling the end of the high pressure cylinder and seating upon said bead, the end of the high pressure cylinder being threaded, and a plug having a barrel dropping into said well and internally threaded to screw onto the end of the high pressure cylinder, said plug engaging the pump head for holding it firmly seated. j

3. An air pump having a high and a low pressure cylinder arranged upright, said cyllnders being connected at their lower ends and the low pressure cylinder delivering into the lower end of the hig'hpre'ssure cyl nder, a pump head consisting of a single casting fitting over the upper ends of said cylinders, said pump head having an annular flange surrounding the low pressure cylinder, and having a well surrounding the upper end of thehigh pressure cylinder, the high pressure cylinder having an annular projection somewhat below its upper end which forms a seat for the bottom of said well, the upper end of the high pressure cylinder being threaded, and a plughaving a barrel fitting loosely into said well and having an internal thread screwing onto the top of the say, it is proper to rely high pressure cylinder, said plug having an annular flange overlying the top of the pump head for holding the parts assembled.

4. In an air pump, a high and a low pressure cylinder arranged vertically, the lower end of the low pressure cylinder delivering to the lower end of the high pressure cylinder, a pump head consisting of a single casting having a delivery hose connection and having an annular flange fitting over the top of the low pressure cylinder, an annular projection on the high pressure cylinder somewhat beneath the upper end thereof, said pump head having a well surrounding and spaced from the upper end of the high pressure cylinder, and having an inwardly projecting annular ledge seating upon the annular projection on the high pressure cylinder, and a plug having a smooth, external, cylindrical surface fitting into said well surrounding the upper end of the high pressure cylinder, said plug being internally chambered and internally threaded to screw onto the threaded'upper end of the high pressure cylinder, and said plug having an annular flange overlying the pump head and engaging it for holding said ledge firmly seated upon the annular projection on the high pressure cylinder.

In witness whereof, I have hereunto subscribed my name.

WILLIAM U. WATSON.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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