US1142734A - Pump. - Google Patents

Description

0. W. SIDWELL. PUMP.

APPLICATION FILED APR. 30, 1913.

Patented June 8, 1915.

W. SEDWELII, OF DELTA, PENNSYLVANIA.

PUMP.

To all whom it may concern: '1

Be it known that I, Gnarmns W. SmwELL, a citizen of the United States, residing at Delta, in the county of York and State of Pennsylvania, have invented certain new and useful Improvements in Pumps; and I. do hereby declare the following to be a full,

' clear, and exact description of the invention, suclras will enable others skilled in the art to which it appertains to make and use the same.

This invention comprehends improvements in pumps and relates more. particularly to those of the type which employ a plurality of intermeshing rotary pistons.

The primary object of the invention resides in the provision of a piunp of this type having peculiarly shaped pistons which may be rotated in different directions depending upon the ports into which it is desired to draw and discharge a fluid.

Although the term ffiuid will be used throughout the specification, it will be understood that the pump will work equally as well when used for pumping air or gas as when. used for pumping water or some other liquid, and may also be used as a vacuum pump.

The invention also" aims to provide a rotary piston for pumps which shall be of extremely simple construction, strong, dur'ahle, and of such construction as to provide a very efficient pump.

With these and other objects in'view, as will become more apparent as the description procecds, the invention consists in certain novel features of construction, combi- 4 nation, and arrangement of parts, as will be hereinafter described and claimed.

.For a complete understanding of my invention, reference is to be had to the following description and drawings, in which,

Figure 1 is a bottom view of my improved pump, the casing being partly broken away and partly in section, and the piston being shown in elevation, Fig. 2 is a vertical sectional view taken on the plane of line .2-2 of Fig. 1, and, Fig. 3 is a detail view in elevation, of one of the pistons.

Referring in detail to the drawings by numera1s,.5 designates the casing closed at its ends by the walls 6 and 7 and provided upon its lower side adjacent its ends with the ports 8 and 9 and upon its upper side centrally of its ends with a port 10. Dis- Specification of Letters Patent. Application tiled Apr-i180, 1913. Serial No. 764,616.

other will be rotated thereby.

accompanying A i Patented line 8, 1915.

posed within the casing and extending longitudinally thereof, are the rotary pistons,

generally designated 11 and 12, having the stub shafts-or trunnions 13 extending longltudinally from their ends through the walls 6 and 7, which form bearings.

The pistons are identical in construction and are formed, as clearly shown in Fig. 3, where it will be seen that one half of the piston is formed with the right hand spiral grooves 14 which run half way around the piston and which extend from the center to one end thereof. The other end of the piston is formed with the left hand spiral grooves 15, which connect at their inner ends with the grooves 14. The grooves 14 and 15 form acute angles with the longitudinal axis of the piston and appear arouately shaped in cross-section. The grooves 14 upon one half of the piston form the.

right hand spiral ribs 16 and the. grooves 15 upon the other half of the piston form the left hand spiral ribs 17. The tops of the ribs are essentially semicircular. as

' shown in Fig. 2.- The piston might be considered as being formed of a bar having concave sides and rounded edges. one half of the bar being twisted in one direction and the other half being twisted in the other direction. Each half is turned'through an are of 180 so that the ribs and grooves will extend half way around the piston.

When the pistons are assembled within the casing 5, the right hand grooves and ribs of one piston are opposed to the left hand grooves and ribs upon the other pistonv and when thus arranged, the pistons mesh with one another so when one is driven the This fact obviates the necessity of driving positively more than one of the pistons. Necessary power may be applied to one of the trunmons 13.

walls 6 and 7 closely engage the ends of the pistons so as to prevent leakage from the grooves at the outer ends thereof.

From the foregoing description taken in connection with the accompanying drawings, it will be seen that I have provided a pump having intermeshing rotary pistons of extremely simple construction, which will operate so as to draw a fluid into the casing and discharge the same therefrom. The construction which I have shown may be used as a pump, fan or as a motor. If a fluid is forced into the port 10 under pressure and allowed to discharge through the ports 8 and 9, the pistons will be driven and act as rotors. The same action, in a reverse direction, will take place when the fluid is forced into the ports 8 and 9 and allowed to discharge through the port 10.

It is to be understood that while I have shown and described the preferred embodiment of my invention, I do not wish to be limited to this exact construction, combination, and arrangement of parts, but may make such changes as will fall within the spirit and scope of the invention.

Having thus described my invention, What I claim is A pump including a pair of intermeshing pistons, each of which comprises a relatively thin body, said bodybeing extended in the line of a compound curve for one-half of its length in one direction, and for the remainder of its length in the opposite direction to form a pair of opposite spiral ribs, and curved edges formed on the ribs to facilitate the intermeshing of the pistons, the line of curve at the terminal of each rib being parallel with the axis of the body and in the same diametrical plane.

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES W. SIDWELL.

Witnesses:

W. W. SELLERS, H. N. LLOYD.

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