US929401A - Air-compressing pump. - Google Patents

Description

S. DAHLBERG. AIR GOMPRBSSING PUMP.

APPLIOATION FILED' 11.53.20, '1909.

Patented July 27, 1909.

\ JN VENTOR,

SVEN DAHLBERG, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR OFATHREE-TENTHS TC GUSTAF N. TEGNELL, OF SPRINGFIELD, MASSACHUSETTS.

AIR-COMPEEssING PUMP.

Specification of Letters Patent.

' Patented July 27, 1909.

Application led March 20, 1909. Serial No. 484,814.

To all whom it may concern:

Be it known that I, SVEN DAHLBEEG, a citizen of the United States of America, and resident of Springfield, -in the county of Iflampden and State of Massachusetts, have invented certain new and useful Improvements in Air-Compressing Pumps, of which the following is la full, clear, and exact description.

This invention relates to air compressing pumps, especially available for the .inflation of pneumatic tires for the wheels of automobiles and other vehicles of the general character of, and for improvements on, the pump shown and described in Letters Patent of the United States granted to me Nov. 24, 1908, Naooaeeo A leading object of this invention, for improvement in an air pump comprising a plurality of separated Y cylinders and a footoperated. yoke for actuating` the piston rods of the cylinders, is to so arrange the connections between the yoke and the'piston rods as to leave the space between the upper portion of the cylinders free and clear for the accommodation of the knee portion of the operators leg, whereby the movements of the latter for operatingthe ypump in a powerful manner may be most comfortably performed. p

Other objects are to improve the construction of the means for holding and steadying the pump bythe hand or hands of the operator while the pumping action is being` performed by the foot; and generally to improve, simplify, and cheapen the construction of the apparatus. f

The invention is described in conjunction with the accompanying drawings and set forth in the claims. Y Y

In the drawings z-Figure l is a front elevation of the air pump, one of the steadying handles being shown as moved to and locked in its elevated position, while the other steadying handle is, by full lines, shown as in its lowered position. Fig. 2 is ay sectional elevation of the pump as seen at right angles to Fig. 1, the portions in. section being as taken on the line 2 2. Fig. 3 is a plan view of the foot-operated yoke. Fig. 4 is a partial horizontal sectional view on line 4 4, Fig. 1, to represent certain details of construction.

Similar characters of reference indicate corresponding parts in all of the views.

In the drawings, A A represent two vertil cal separated and parallel pump cylinders which are supported and connected together by a base B of suitable construction and design, each cylinder having, as understood, a piston a therein,-the pistonrod C for each piston extending above the top of each cylinder.

The air inlet way, ythe internal valves and the 'outlets for the compressed air understood as located in the base or lower portion of the pump and having connection with the flexible tube D are or may be of any usual or approved construction and arrangement and, forming no part of the present invention, are not here shown or described.

Each piston rod C has n' at its upper end which is above the upper end of the cylinder,

a transversely arranged rigid bar l) which has its middle portion secured to theupper extremity of the piston rod, and which extends at opposite sides of the piston rod at right angles to a line between the centers of the cylinders.

G represents the yoke comprising separated upper and lower portions d, d2 to be envgaged by a persons foot, the lower yoke member being arranged between the cylinders and having, asV shown in Fig. 3, bifurcated extremities f to embrace `the front and rear sides of the cylinders while heely playing vertically relatively thereto.

g g represent vertically arranged rodsin pairs and respectively connected with the opposite extremities of the transverse bars b carried at the upper yends of the piston rods and connected at their lower ends with the portions of the lower member of the yoke which are located at the front and rear sides of the cylinders. The 4connections of the rods g g with the extremities of the lowery yoke member and with they end portions of the transverse bars b of the piston rod are, as indicatedinthe drawings, by means of nuts o 0 in pairs vengaged' with the screw threaded extremities of the rods and tightened at opposite sides of the parts t and d2.

The double cylinderpump comprising the parts in arrangement as described and shown, is one affording an unobstructed space between the upper portions of the cylinders for the accommodation of the knee of the operator who by his foot, in engagement with the yoke is operating the pump.

In the pump as here shown, a pair ofk steadying handles are provided as appurtenances of thecylinders to enable a person, .whileoperating the pump by foot movement,

to steadily hold the pump body without having to stoop more than may be comfortable. These handles carried at the upper end of straight vertical stems are raised, and locked intheir elevated positions, when the pump is to be used, but are susceptible of being lowered in a considerable extent so that when the pump is not in use the handles are located but little above the tops of the cylinders; and it will be pointed out that each cylinder has at its upper portion a Vlateral extension comprising upper and lower' members 10 and l2 with a separating edgewise opening recess 13 therebetween,-there being a vertical aperture 14 through the lateral extension which practically crosses Vthe said recess, and through which the handle carrying stem may freely vertically move. Each handle stem is provided at its lower end with a lug, dog, or button fi, having essentially no projection radially from the stem at one side thereof, but having a material extension beyond such stem .at the opposite side thereof, so that under a rotative movementin one direction oit' the stem the lug may acquire an engagement in said recesses above the lower member 12 for maintaining the handle in its elevated position,-it being understood that by partially rotating the handleY carrying stem to swing the lug clear from its engagement with the member 12 on which ithad 'been supported, the handle carrying rod or stem may be downwardly slid through the guiding aperture 14 therefor to bring the handledown closely to the top of the cylinder Vfor economy of space in transportation or when the pump is to .be stowed away.

I claim1- f 1. In an -air pump, a base, a pair ot' separated vertical cylinders supported by and -iising above the base having their movable piston rods extending above the upper ends oi lthe' cylinders, and each provided with a bar alixed thereto and extending at opposite'sid'es of the piston rod at right angles to a line between .the cylinders, a movablelyoke arranged between the cylinders, comprising separated upper and lower portions to be engaged and operated bya persons foot, and pairs of vertically varranged rods connected lto the opposite extremities oi said transverse bars and connected at the lower portions to the extremities oi said yoke.

2. In an air pump, a base, a pair oi' separated -vertical cylinders, supported by and rising above the base, movable piston rods extending above the upper ends of the cylinders andveach provided with a transversely arranged bar which has its middle portion secured to the upper extremity oil the piston rod and which extends at opposite sides of the piston rod at right angles to a line between the cylinders, a yoke comprising sepp arated upper and lower portions to be engaged by a persons foot, the lower yoke member being arranged between the cylinders and having bifurcated extremities to embrace the iront and rear sides of the cylinders, and pairs ci' vertically arranged rods connected with the opposite extremities oiA said transverse bars, and connected at their lower ends with portions of the lower member of the yoke which are located at the front and rear'sides of the cylinders. Y

3. In an air pump of the character described, a pair of vertical separated pump cylinders supported and connected together at their lower portions and having an open and unobstructed space between their upper portions, a yoke to be engaged and operated by a persons foot, between the cylinders, connections between the piston rods of the respective cylinders and the saidV yoke, having their locations outside of the spacebetween the cylinders, and means forrholding the base connected cylinders against movement while the foot yoke is being operated.

4. In an air pump, a supporting base and a vertical cylinder rising thereabove having a piston rod the upper end of which projects above the cylinder, said cylinder having at its upper portion a lateral extension comprising upper and lower members with a separating recess therebetween, and a vertical aperture intersecting said recess, a handle provided rod vertically playing through said aperture and provided at a lower .portion vthereof with a lug adapted, under rotative movement in one direction of the rod, to acquire an engagement in said recess between the separated upper and lower members oi' said extension and adapted under rotative movement of the rod in a reverse direction to be free from such engagement to permit vertical movements oi the rod.

Signed by me at Springlield, Mass., in presence oi two subscribing witnesses.

Witnesses: Y

GUsTAv N. TEGNYELL, WM. S. BnLLows.

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