US1024921A

US1024921A - Pump-jack for double-acting pumps.

Info

Publication number: US1024921A
Application number: US65923211A
Authority: US
Inventors: Fred W Axtell
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-11-08
Filing date: 1911-11-08
Publication date: 1912-04-30
Anticipated expiration: 1929-04-30

Description

P. W. AXTELL.

PUMP JACK ma DOUBLE ACTING PUMPS.

APPLIOATION FILED NOV. 8, 1911.

1,024,921 Patented Apr. 30, 1912.

2 BHBETSSHEET 1.

P. W. AXTELL.

PUMP JACK FOR DOUBLE ACTING PUMPS.

'APPLIGATION FILED NOV. 8, 1911.

Patented Apr. 30, 1912.

2 SHEETSSHEET 2.

INVENTOR 2 5 MW WITNESSES FRED W. .AXTELL, OF FORT WORTH, TEXAS- PUMP-J'ACK FORYDOUBL-E AGTING PUMPS.

To all whom it may concern:

Be it knownthat I, FRED W. AX'I'ELL, a citizen of the United States, residing at Fort Worth, in the county of Tarrantand State of Texas, have invented certain new 'and useful Improvements in. Pump-Jacks for Double-Acting Pumps, of which the following is 'a specification.

This invention relates to pump jacks for double acting pumps, and the object is to provide a pump jack which is double geared, heavy, and compactly built, requiring very little floor space, and especially adapted for.

. heavy duty.

Another object is to provide the pump with forged steel pitmen with bent and machine turned ends which work in bronze bearings at both ends which are easily removed, inexpensive and interchangeable and in which the center of the bearing is in line with a plane which runs through the vertical center of the gear wheel and pinion for preventing cross strain.

Another object is to provide an improved base for supporting and holding the working parts securely in operative relation and to provide. rifled sockets for the upright guide rods in the base.

Another object is to provide bearings for the drive wheel that are eff-set relative to the center of the cross heads which drive the piston rods whereby agreat advantage is obtained in operating power.

Another advantage is thatpthepiston is attached to the middle of the cross head in such manner as to give a parallel movement of the same, reducing the stufiing box friction to a minimum.

Other objects and advantages will be fully explained in the following description and the invention will be more particularly pointed-outin the claims. I

Reference is had to the accompanying drawings which form a part of this application.

Figure 1 is a rear elevation of the pump jack, complete; Fig. 2 is a side elevation of the pump jack, the drive pulley being shown only in dotted outline; Fig. 3 is an end View of a bronze bearing for a cross head; Fig. 4 is a section of a similar bearing in the drive wheel; Fig. 5 are detail viewss, being an edge and a side view of the dog used in theeuniversal pipe centering device; Fig. 6'

is a plan view of a universal pipe centerer;

Fig. 7 is a view of the lower end of one of Specification of Letters Patent. Application filed November 8, 1911. Serial No. 859,232.

REISSUED Patented Apr. 30, .1912.

the guide rods; Fig. 8 is:asectio'n of one of the sockets for the guide rods; Fig. 9-is a plan view of the entire base with all working parts omitted; Fig. 10'is a side elevation of the same; Fig. 11 is a vertical section of the base taken on the line wm of Fig. 9,

several views.

The jack is provided with a base which.

is composed of two trough like castings and each casting is composed of outer walls 1 and inner walls 2 and end walls 4 and with a bottom 3 which is integral with the side and end walls. The walls 1'-1 and 2-2 constitute the bearing walls for the driving gear and also the bearing walls for the piston driving gear. 7

The castings are provided with flanges 5 and on the front ends of the castings are formed vertical sockets 6. The two castings are rigidly connected together by a curved flange casting 7 which has flanges 8, riveted to the inner walls 2 of the bearing castings. The bearing walls. 1--1 are provided withbearings 10 and the bearing walls 2'2 are provided with bearings 11 for the shafts of the piston driving wheels and for the crank disks. These bearing walls are also provided with bearings 9 for the main driving shaft. The inner walls 2 have cut outs 12 and 13 for the arms 15 which are integral with the pipe centerer. 14. The arms 15 of this pipe centerer are placed under the ends of the castings so that when the castings are bolted down to the base timbers the pipe centerer will be held rigidly in place. The shaft 18 which is the main driving shaft is journaled in the bearings 9. The bearing walls have cars 16 cast integral therewithto receive the ends of the

braces

28 and 29. 'The braces 28 are inserted in the ears 16 of the outer walls 1 and in sockets formed in the tie bar 1 25'. The braces 29 are inserted at the lower ends in the cars 16 of the inner walls 2 and in clips 29' which are secured to the central uprights 24 at points which are not reached 36. The cross head 21 is uided in its vertical movement by the guide rods 24 which omitting the pipe centerer; and, Fig. 12 is a I vertical section taken on the-line yy of are rifled in the sockets 6 and secured in sockets in. the tie bar 25'. The cross head 22 is guided in its vertical movement by the guide rods 28 and 24: which are rifled in the sockets 6 and secured in sockets in the tie bar 25'. A stuffing box 37 is mounted on the cross head 21 for the piston 36.

Pinions 27 are'mounted rigidly on shaft 18 and drive the gear wheels 26 which are mounted on shafts 18. The shaft 18 is pro- 1 and the bushings are inserted in the bearings '25 with the lugs also embedded inthe bearings The center of the bearings 25 is in line with the plane which runs vertically through the center of the gear wheel 26 and pinion 27 so that there will be no cross strain of the pitman rod 19., The cross head 21 is driven by pitman rods 20 which are similar to pitman rods 19 and the pit man rods 20 are pivotally connectedto crank disks 20, These disks are rigid with shatts llY/and consequently the disks are driven by the power from the gear Wheels 26 which power is transmitted by means of the shat s 18,

The bearings 11 of the bearing walls 2 and the bearings 10 ot the bearing walls 1 are ofi -set relative to the centers of the vertical guide rods 2d and 28 and consequently the vertical centers of the cross heads for the purpose of securing greater power from the drive wheels. By reason of this arrangement of the od-set bearings approximately 17% more time is required to make the up stroke of the piston rods than the down. stroke, thus reducing the strain on the lifting parts in the same ratio as the strain is less on this plan than if the time were divided equally between the down stroke and the up stroke as is common in other pump jacks. This means the time'of one revolution of the driving gean is a furtheradvantage of getting a quick return of the down stroke in permitting the valves to close quicker, llt also permits the valves to start slower increasing in speed after they are in motion by which the best possible result is obtained and which is not possible when the time of the stroke is evenly divided between the up and down stroke.

} The universal pipe centerer consists of a cylindrical casting 14L with arms 15 which have ribs integral therewith and which proiect up to the top ofthe castings, Sock'em 3? are tanned in the casting 1e and in these There roaaesr sockets are pivoted dogs which have lugs 39 projecting into Vertical grooves in the walls of the sockets 37. The dogs 38 will thus swing inwardly at the free ends and engage the pipe 40 by which the pipe can be accurately centered. The dogs 38 are pivotally mounted by reason of the lugs 39 which project into the grooves in the walls of the sockets 37.

Having fully described my invention, whatT claim as new and desire to secure by Letters Patent, is

1. A pump-jack for double acting pumps comprising a baseconsisting of two bearing members each having two bearing walls formed of anv integral structure and a curved flanged binding member bolted to each of said members and making said members rigid witheach other, the "front ends of said bearing members having four sockets formed therein in alinemcnt with. each other, four vertical guide rods rifled in said sockets, an interior piston cross-head adapted to move vertically on all of said guide rods, an exterior piston cross-head adapted to move vertically on the two central guide rods, gear wheels for driving said interior piston 'crosshead having shafts journaled in the exterior walls of said bearing members V and pitmen operatively connecting said cross-head with said gear wheels, crank disks for driving said exterior piston crosshead operated by said gear wheels, and pitmen operatively connecting said cross-head and said disks, and means for driving said gear wheels, v

2. A pump-jack having .a rigid base consisting of two pairs of walls, each pair having an integral connection at the ends and throughout the bottoms thereof, constituting bearing walls and means for making said bearing walls rigid with each other, sockets for guide rods being formed in said walls, vertical guide rods rigid in said sockets, cross-heads adapted to move on said guide rods, gearing and pitman rods operatively connected with said gearing and with said cross-heads, shafts for said gearing and bearings for said shafts ofi set in said bearing walls relative to the centers of said iiide rods and cross-heads.

3. pump-jack having a base consisting of two bearing members rigid with each other and each having two bearing walls, the front ends of said walls having sockets formed therein, four parallel vertical guide rods rifled in'said sockets, an interior piston cross-head adapted to move on all of said guide rods, an exterior piston cross-head adapted to move on the two central guide rods,.gear wheels and pit-men for driving said interior piston cross-head, shafts for driving the said gear wheels journaled in the exterior walls of said bearing members, crank disks and pit'men for driving said exterior piston cross-head, a pair of disks being connected to each pitman, the exterior disk for each pitman being rigid with the shaft of the adjacent gear wheel, a shaft for the interior disks journaled in the interior walls of said bearing members, a shaft journaled in all of said walls, and gearing on said shaft for driving said gear wheels, and means for driving said shaft.

4. A pump-jack having a base consisting of four rigid parallel bearing walls having sockets formed in the front ends thereof,v

four parallel guide rods rifled in said sockets and a tie-bar connected to the upper ends of the guide rods, an interior piston crosshead adapted to move on all of said rods, an exterior piston cross-head adapted to move on the two central guide rods, pitmen and gearing operatively connected with said cross-heads and with said bearing walls for moving said cross-heads, braces for the tw exterior guide rods rigidly connected to said tie-bar and to the rear ends of the exterior bearing walls, and braces for the two interior guide rods rigidly connected thereto at points between the travel of said crossheads and to the rear ends of the interior bearing walls.

5. A pump-jack having a rigid base consisting of bearing walls and means for making said walls rigid with each other, sockets for guide rods formed in said bearing walls,

vertical guide rods rigid in said sockets,

cross-heads adapted to move on said guide rods, gearing and pitman rods operatively connected with said gearing and said crossheads, shafts for said gearing journaled in said bearing Walls, means for driving said gearing, and a pipe centerer at the front end of the pump-jack consisting of a vertical cylinder having laterally extending arms.

projected under the two adjacent bearing walls, said bearing walls having cutouts thereunder to receive said arms, and dogs pivotally mounted in said cylinder for engaging the pipe. 4

6; A pump jack consisting of bearing walls and means for making said walls rigid with each other, sockets for guide rods being formed in said bearing walls, vertical guide rods rigid in said sockets, a cross-head adapted to move on said guide rods, bearings in said cross-head, gear wheels and bearings in said gear wheels, removable bronze bushings in said bearings, and pitman rods having bent ground journals engaging said bearings for driving said crosshead, the centers of the bearings in said cross-head being in, a vertical plane passing through the centers of said gear wheels.

In testimony wh 'reof, I set my hand in the presence of two witnesses, this 19th day 7 of October, 1911.

FRED 1V. AXTELL.

Witnesses:

A. JOHNSTON, A. L. JACKSON.