US1021310A - Air-pump. - Google Patents

Description

H. J. HAWTHORNE, G. B. WYATT & O. P, WARNER;

AIR PUMP.

APPLICATION FILED MAR.6, 1911.

Patented Mar. 26, 1912.

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UNITED STATES PATENT OFFICE.

HERBERT J. HAWTHORNE, GUY .B. WYATT, AND OTTO .P. WARNER, OF CLEVELAND, OHIO; SAID WARNER ASSIGNOR TO B. H. REYNOLDS, OF MILWAUKEE, WISCONSIN.

AIR-PUMP.

Specification of Letters Patent.

Patented Mar. 26, 1912.

Application filed March 6, 1911. Serial No. 612,659.

more especially to such as employ singleacting pistons.

The object of the invention as fulfilled by'novel changes in the relative position of diverse parts is to eifect an increased general efiiciency.

The said invention consists of means which are hereinafter fully described and particularly set forth in the claims.

The annexed drawing and the following description set forth in detail certain means embodying our invention, the disclosed means, however, constituting but. one of va rious mechanical forms in which the principle ofthe invention may be applied In said annexed drawing :Figure 1 is a vertical section of a machine embodying my invention, and showing driving means in simple outline. Fig. 2 is a similar see- A hollow air-tight base A having a pipe outlet 0. supports the upright frame 13.

This latter comprises preferably an integralcylinder b interiorly adjacent a flange b by means of which it is attached to the.

base A, as clearly shown in Fig; 1. This cylinder has its lower end 6 open and somewhat above its lower extremity b is provided with a plurality of side-outlet open- A movable cylinder head C constructed as shown, is lower end 6 including the ope aings 6 within its annular recess 0 and necessarily with the airtight connection afiorded by the piston rings b which are located just above the openings 5 The arrangement is such that the cylinder head 0 is normally held in close engagement with the lower extremity 6* and in this position it closes the openings 6 both interiorly and exteriorly as will be apparent from an inspection of Figs. 1 and 2. -The upright spring 0 exadapted to inclose the tending into the angular central] disposed depression 0 serves to maintain t is normal engagement, as will be readily understood.

The upper portion of the frame is made to flare outwardly in three directions, as represented in Fig. 2, leaving one-open side whereby a hollow open compartment 1) laterally of approximate circular cross-section is provided. The open side is supplied with removable cover plate 6 for the obvious piurpose of permitting access to the interior. An integral centrally disposed bearing 6 is further provided to accommodate the crank-shaft D, which in turn supports a driving gear E. A connecting rod F establishes an operative relation between the shaft D and a piston G1. The gear E may be driven by a pinion. H as mounted upon the driving shaft J of an electric motor, shown in outline in Fig; 1.

A plurality of adjustably controlled. air inlets K are arranged to communicate directiy with the cylinder 6, and in accord ance with our conception at points variously located intermediately of the ends of the strokes of the piston, the precise arrangement being such that the communication between some of the several inlets and the cylinder, whether simultaneous or successive, is positively assured considerably prior to the arrival of the piston at dead center, which is generally midway of the length of the cylinder. By thus positioning the means for replenishing the air supply in the cylinder, more remotely from the end of the returnthan from the end of the compression stroke of the piston, it becomes ossible to have the inlets disposed at di erent points therealong, whereby they may serve as successively operating relief valves for the purpose, in turn, of havingthevacuum created behind the piston taken care, of gradually, and an equal pressure maintained throu bout the return stroke of the piston. This is calculated to insure that uniform load which is so prominent a requisite to general efficiency. I

Our air pump in the nature of a selfcontained structure, is calculated to operate in the following manner: The reciprocation of the piston G through the medium of the operating mechanism first alternately compresses the air in the cylinder and drives it out through the openings 6 against the action of the cylinder head, as will be manifest. Durin this alternate up and down movement 0 the cylinder head C, an air cushionin efi'ect is established between it and the lnclosed portion of the cylinder, whereby a substantially noiseless vvalve structure is attained. The hollow air-tight base meanwhile constitutes an air receiver from which the air under compression may be more uniformly withdrawn by reason of being partially independent of the intermittent discharges, from the cylinder. This should carry quite an appreciable value where, forexample, it is intended to inflate the rubber tires on automobiles. During the return stroke of the piston, the properly adjusted inlet valves will very adually overcome the vacuum so that at the end of the stroke none at all remains, and hence the jolting at present resulting from the sudden inrush at the end of each alternate stroke is positiyely precluded.

Having fully described our invention, what we claim and desire to secure by Letters Patent is 1. An air pump comprising a cylinder having one end open and provided adjacent thereto with a'lateral opening, a piston within said cylinder, operating mechanism connected with said piston, and a movable cylprovided with an annular recess adapted to lnolose said end and opening.

2. A11 air pump com rising a cylinder having near one end a p uralityof circumferentially disposed openings, a piston within said cylinder, operating mechanism connected with said piston, and a movable cylinder-head adapted toboth interiorly and exteriorly close said openings.

3. An air pump comprising a frame having a-hollow member, a cylinder having an open end extending into. said member, and provided with an .inlet and a side outlet, the latter communicating with said hollow member, a movable cylinder-head provided with a recess adapted tosuccessively close said cylinder end and side outlet, an operatshaft promoting into said frame, a pinion upon said shaft, a driving gear engaging said pinion, a crank-shaftconnected with said gear, a connecting rod secured to said crank-shaft, and a piston pivotally connected with said rod, said cylinder being provided with an air inlet more remotely lo cated from the end of the return than from the end of the compression stroke of said piston, and-an air outlet within said chamber located near said open end, and adapted to be closed by said cylinder head.

Signed by us, this 28th day of February,

HERBERT J. HAWTHORNE. GUY B. WYATT. OTTO P. WARNER. Attested by-- Gnonsn W. ELLSASSER, C R'r B. MUELLER.

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