US1579908A

US1579908A - Long-stroke pumping mechanism

Info

Publication number: US1579908A
Application number: US22588A
Authority: US
Inventors: Merton T Archer; Joseph R Mahan
Original assignee: Nat Supply Co
Current assignee: National Supply Co
Priority date: 1925-04-13
Filing date: 1925-04-13
Publication date: 1926-04-06
Anticipated expiration: 1943-04-06

Description

A ril 6,1926. 1,579,908

I M. T. ARCHER ET AL LONG STROKE PUMPING MECHANISM Filed April 15, 1925 2 Sheets-Sheet 1 W INVENTORS ATTORNEY A ril 6, 1926. 1,579,908

M. T. ARCHER ET AL LONG STROKE PUMPING MECHANISM Filed April 15, 1925 2 Sheets-$fieet 2 I INVENTORS.

WLfi W1) A TTORNEY' Patented Apr. 6, 1926.

UNITED STATES AT NY orrics. v

MER'ION T. ARCHER, OF PITTSBURGH, PENNSYLVANIA, AND JOSEPH IYIAHAH, OF TOLEDO, OHIO, ASSIGNORS TO THE NATIONAL SUPPLY COMPANY, OF TOLEDO, OHIO,

1 CORPORATION OF OHIO.

LONG-STROKE PUME'ING MECHANISM.

Application filed. April 13, 1825. Serial No. 22,588.

To all whom it may concern: I

Be it kno vn that we, MEI-tron T. linonnn, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, and Josr; H R. MAI-IAN, a citizen of the United States, residing at Toledo, in the county ofLucas and State of Ohio, have invented new and useful Improvements in Long-Stroke Pump,

ing Mechanism, of which the following is a,

specification.

Our invention relates to long-stroke pumping mechanisms. The objects of the invention are to provide a pair of intermeshing elliptical planetary gears having novel means for fixing the distance between their centers without the use of shrouds; and to provide special means to prevent relativetransverse or lateral motion of the gears. Other objects appear hereinafter.

Referring'to the accompanying drawings, Fig. 1' is a side view of a portion of a pumping mechanism employing our invention; Fig. 2, a central transverse section through the two centers on which the gears turn, the section being taken on the line II-II of Fig. 3; and Fig. 3, a section on the line III-III of Fig. 2.

1 designates the floor of a derrick and 2 is a post on whose upper end the walking beam 3 oscillates. The right-hand end of.

the walking beam may operate a pump or other device. old and well known.

The left-hand end of the walking beam 3 has suspended therefrom the pitm an at which is secured between thetwo lugs 5 projecting horizontally from one face of the traveling'or planet gear .6. This gear 6 meshes with the gear '7 keyed to the drive shaft 8 deriving its rotary motion from any suitable prime mover. The shaft 8 is supported at the end shown, by the post 9.

The gears 6 and 7 are substantially elliptical. The gear 6 is composed of two spaced peripherally-toothed

elliptical members

10 and 11 connected together by the central hub 12; and the gear 7 is composed of two spaced peripherally-toothed members 18 and 14 connected together by the central hub 15, the

members

10 and 11 meshing re spectively with the members 13 and 14. The shaft 8 is keyed to the hub 15 and the shims seated between the

members

13 and 1% at The parts described are all adjacent portions of the members 13 and 14K. Thegears turn on centers which are at the intersection of their major and minor has two openings to receive the rollers 19 and '20 rotatable on the pin21 extending lengthwise through the frame in line with the centers of the

hubs

12 and 15. The rollers approxi ately it betwcen'the members ofthe gears.

22 is a cap seated between the

members

10 and 11 and at tne outer side of the hub 12. Its ends at each side of the hub are spaced from the end of the frame by the 24 is a cap like cap It is the outer side of the hub 15. Its ends at each side of the hub are spaced from the end of the frame by, the shims 25. Two bolts 26 extenthat opposite sides of the hubs, entirely through both caps and the frame 18, and are provided with nuts 27 which screw tightly against the caps to secure the described partsin a unitary str cture. The parts are so made that, when the shims are tightly clamped between the caps and the frame 18, the hubs are well supported on all sides. Some of the shims may be re- I moved from time to time as the parts wear.

Then the nuts will be tightened compensatively.

l l hile the gear 7 is making two complete rotations the gear 6 makes one complete revolution. Assuming that the gear 7 ro tates as indicated by the a'row, the minor axis of the gear 6 will be in alinement with the major axis of the gear 7, when the major axis becomes horizontal, and the major axis of the gear 6 will be in alinementwith the minor axis of the gear 7 when the latter axis is vertical. Accordingly, the stroke of the pitman at is the sum of the major and minor axes of the gears.

against the op- Fig. 3 shows the positions of the gears major axis of the gear 7 and the minor axis ofthe gear 6 are first in a horizontal line. When the gear 7 has been rotated a half revolution further, the major axis of gear 6 and the minor axis of the gear 7 will be in a vertical line. At the conclusion of another half revolution of the gear 7 the major axis of the gear 7 and the minor axis of the gear 6 will again be in a horizontal line. When the gear 7 has moved another half revolution, the major axis of the gear 6 and the minor axis of the gear 7 will be again in a vertical line.

During the operation of the walking beam 3 by the gears (3 and 7, there are two periods in the travel of the gears 6 completely around the gear 7 when the walking beam is at rest, these periods being when the gear 6 is directly over the gear 7, and when it is directly under the same. At these two periods the up-stroke and the down-stroke of the right-hand end of the walking beam are about to begin. If a pump is attached to the righthand end of the walking beam, the strokes of the pump would begin as the walking beam and pitman start from rest, and the strokes would accelerate according to a modified sine curve to a maximum speed, at which time the major axis of the gear 7 becomes approximatelyhorizontal. From this time the strokes decelerate until the gear 7 is again horizontal and the gear 6 is directly above or below the gear 7, at which place the walking beam has a period of rest, the gear 7 having then made a complete rotation. Further movement of the gear 7 for the next complete revolution, causes the cycle just described to be repeated, except that the direction of travel of the pitman and the ends of the walking beam would be reversed. The described acceleration and deceleration of the strokes from periods of rest are very advantageous for the operation of the reciprocating pumps, because the impact due to the reversal of the direction of travel of the moving parts is decidedly dampened, and be cause the speed of travel of the moving parts accelerates from zero gradually to a maximum and then decelerates gradually to Zero. The elliptical gears cushion the impacts set up at the changes of direction of strokes.

Not only does the frame 18 ii): the distance between the centers of rotation of the gears, and thereby n'event any tendency toward the crushing of the gear teeth, but the frame prevents any appreciable relative lateral mo tion of the gears. The pitman being on one face of the gear (5 causes thrusts to be exerted tending to overturn the gears. This leverage is much shortened by the employment of the

rollers

19 and 20. If the gear 6 has a tendency to move downwardly in Fig. 2 owing to the action of a pitman secured between the lugs 5, the frame 18 would be urget downwardly, the gear 6 acting at the point 28 on the roller 19, which causes pressure of the roller 20 against the point 29 on the gear 7. Not only is the gear 6 prevented thereby from appreciable movement lateral on the gear 7, but the leverage lending to overturn the gears has only the distance from the center of the shaft 8 to the point 29. In case the pitman tends to push the gear 6 upwardly in Fig. 2, the gear (3 will engage the roler l9 opposite the point SS, and the roller 20 will, at a place opposite the point push against the gear 7.

We claim:-

1. A shaft, a pitman, and a. pair of plane tary gears fixed to the shaft and pitman respectively, each. gear comprising two parallel members connected by a hub, in combination with a frame situated between the members of each gear and spacing the centers of the gears apart, and means carried by the frame for linking the gears together.

A. shaft, a pitman, and a pair of planetary gears fixed to the shaft and pitnran respectively, each gear comprising two parallel members connected by a hub, in combination with a frame situated between the members of each gear and spacing the centers of the 621 rs apart, means carried by the frame for linking the gears together, and rollers carried by the fame and arranged to contact with the opposing faces of the said gear members.

3' A shaft, a pitman, and a pair of plan etary gears fixed to the shaft and pitlnan respectively, each gear comprising two para lel members connected by a hub, in combination with a frame situated between the members of each gear, means carried by the frame for linking the gears together, and rollers carried by the frame and arranged to contact with the opposing faces of the said gear members.

The combination of a shaft, a pitman, a pair of intergeared elliptical gears, one keyed to the shaft and the other secured to the pitman, and means: linking the gears together, the gears being arranged so that the minor axis of the driving gear is substantial y in line with the pitman when the pit man is about to change the direction of its stroke.

In testimony whereof we hereunto atlix our si natures this (5th day of April, 19:25.

MERTON T. ARCH ER JOSEPH R. MAHAN.