US1906405A - Air pump - Google Patents

Description

May 2, 1933 T. L. PATRICK 1,906,405

AIR PUMP Filed May 6, 1929 Qs, www

Patented May 2, 1933 UNITED STATES PATENT oFFlcE Tnsononn L. PATRICK, or CARDWELL, MONTANA, AssIGNoR or ONE-HALF To .ToHN

' TnUzzoLINo, or BUTTE, MONTANA i Ara PUMP Application led May 6,

This invention relates to air pumps and more especially to pumps of the double. acting type, and my objectisto produce aV simple, strong, durable and eiiicient pumpv which will enable motorists to quickly andeasily effect inflation of tires or supply air under pressure for other purposes.

lVith this obj ect in view the invention consists in certain novel and useful features of construction and combinations of parts as hereinafter described and claimed; and in order that it may be fully understood, reference is to be had to the accompanying drawing, in which: Y n

Figure 1 is a view partly in elevationand partly in central vertical section, of a double acting pump embodying the invention.

Figure 2 is a horizontal .section on the line II-Il of Figure 1.

Figure 3 is a horizontal section on the line IIL-III of Figure 1.

Figure 4 is a horizontal section on the line IV-IV of Figure 1.

Referring now tothe drawing in detail, 1

indicates a suitable base provided in its upper side with a pair of circular recesses 2. It is also formed with a passage 8 connecting the two recesses and a passage 4 leading upward from passage 3, to a point exterior to the said recesses.

A pair of cylinders 5 tit and are secured at their lower ends in the respective recesses with an air-tight relation. Secured to the upper ends of the cylinders is a cap or head,

composed of a pair of plates 6 and 7 spaced apa-rt by a marginal gasket 8, and gaskets 9 are interposed between the head and the cylinders. The gasket 8 establishes an air-tight relationship between the plates of the head,

and by spacing said plates apart provides a passage or chamber 10 for the head. The gaskets 9 establish an air-tight relationship between the head and the cylinders, and the lower plate of the head is provided with passages 11 which respectively connect the chambers of the cylinders with the chamber 10 of the head.

Connecting the base and head between the cylinders,\is a pipeway consisting of pipe sections 13 and k14 united by a union l5.

1929. Serial No. 360,785..

Pipe section 13 is equipped with a valve casing 16, containing a ball valve or plug 17 and yclose communication betweeny the valve cas-` ing and the air passage or chamber v10. A similar valve casing 19 is provided inthe lower end of pipe section 14 and contains a ball valve or plug 20 and a spring 21, the lat ter acting to normally maintain the ball valve 20 seated and closing communication between the valve casing and air passage 3. The pipe section 14 is also provided with a coupling 22 having a nozzle 23 for-engagement' by a' flexible hose connection, not shown, to supply air to a pneumatic tire or other object. l

The upper plate ofthe head is provided in line with the axial center of each cylinder, with any suitable packing gland 23a, and extending slidingly through said packing' glands and the head, are tubular piston rods or stems 24. vEach piston rod or stem is equipped at its lower end with a pair of spaced pistons 25 and 26 of the cup-leather or equivalent type, the pistons 25 facing downwardly and the pistons 26 facing upwardly, and between said pistons the respective stems are each provided with an orifice 27, it being understood that the stems belowsaid orifices are closed. The upper ends of the stems are open to the atmosphere as at 24aandA they are connected by a handle 28. y

j To `operate the pump, the handle is grasped and whenpvpressed ldownwardly imparts corresponding movement to the pistons. This effects expansion of pistons 25 which1force the air from the lower ends ofthe cylinders into the passage 3 and upward. within the pipeway, the pressure thus produced unseating the ball valve 20 vto permit the air` to pass into the valve casing 19 andthrough the stem of the coupling 22, becausei'at this time the'ball valve 17 is seated, not'only because the spring 18 normally holds said valve seated as explained, but becausey air passing up through the pipeway cooperates with said spring in said action, and also because the downward movement of the pistons tends to create-a vacuum in the 'upper ends of the cylinders and the passage 10 to cooperate in the tight seating of said ball valve 17. As the downward movement of the pistons with valve 17 seated, tends to create a vacuum above the pistons 25, there follows collapsing move-ment of the upper pistons 26 and results in 'air entering the upper ends of the piston stems or rods and passing through pass through orifices 11 and the pasage 10,

and from the latter downward through pipe section 13 into the valve casing 16, this action unseating the ball valve 17 so that the air can pass downward through the pipeway to the coupling 22,v it being understood that vas the upward movement of the pistonsstarts, the upward pressure on the ball valve 2O is removed to permit said ball valve to beinstantly seated under the pressure of its spring 21 and the suctional pull created in the lower ends of the cylinders. .v

Upon the following downward and upward movements of the handle, the actions just described arenrepeated. It will thus'be seen that with each stroke of the pistons air is discharged from the coupling'through its stem 28, -and that iny practice a constant stream of air is passing from the coupling. The pump is therefore a double acting pump and will enable an operator to charge an infiatable tire or other objectI quickly and easily. K

From the above description it will be apparent Vthat I 'have produced an air pump pos"- sessing the features of advantage set forth as desirable in the statement of, the object of the invention, and' which is susceptible of each cylinder for alternately forcing air t0- ward the opposite ends of the cylinders, hollow piston rods carrying said spaced pistons, said rods having their bores communicating with the atmosphere at their upper ends and vbeing closed at their lower ends, and cross 'way, one adapted to o'pen under air pressure `from the cylinder at one end thereof, and the other adapted to open under pressure of air from the cylinderat the other end thereof, an-air-discharge connection from the pipeway between said valves, a pair of 'simul- 'taneously operable spaced pistons inthe cylinder for alternately forcing air toward-the opposite ends of the cylinder, a hollow piston rod carrying said pistons and being open to the atmosphere at its upper end and closed at its lower end, and a cross bore Acofnn'ecting said piston rod bore above its closed lower end w'vith the space between said pair' of pistons. i

Intestiinny whereof 'I aiXmy signatu THEODOR'E L. PATRICK.

modifica-tion in various particulars withinV the .principle of Vconstruction involved and the spirit and scope of the appended claims..

Iyclaimf: 1. Ana-.ir pump comprising arbase, a pair of cylinders secured on the base, a head closing the upper ends*v of the cylinders, a pipeway communicating at its opposite ends with the corresponding ends of the cylinders, a

` pair of normally-closed check valves for the pi-peway, one adapted to open under air pressure fromthe cylinders at one end thereof and the other adapted to open under pressure of air from the cylinders at the other end thereof, an air-discharge connection for the pipeway between the said valves, a. pair of simultaneously operable spaced pistons in

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