US1412548A - Device for connecting pull rods to wrist pins - Google Patents

Description

J. H. WILSON.

DEVICE FOR CONNECTING PULL RODS T0 WRIST PINS; APPLICATION FILED JAN-18.1922- 1,4:12,54:8 Patented D 11, 1922.

UNITED STA TES PATENT OFFICE.

JOHN HART WILSON, OF BURKBURNETT. TEXAS.

, Specification of Letters Patent.

Patented" Apr. 11, 19122.

Application filed January 18, 1922. Serial No. 530,148.

To all whom it may] concern:

Be it known that 1, JOHN H. \Vrnsox, a citizen of the United States, and residing at Burkburnett, -Wichita County, State of Texas, have invented certain new and useful Improvements in Devices for Connecting Pull Rods to Wrist Pins, of which the following is a specification.

The present invention relates to devices for connecting theends of pull rods of oil well pumps to the crank or wrist pin of a driving engine or power, unit.

in a well known arrangement of pumps in the oil fields it is frequently desirable to employ a single power unit, such as internal combustion engine, to furnish power necessary to operate pumping machines positioned at severaldifferent'wells which are close to each other. Usually this power unit or engine is connected, at the mouth of one well, directly to a pump positioned to lift the oil at that well and is connected by chains, ropes or pull rods with one or more pumps positioned at adjacent wells so that these several pumps are simultaneously operated without necessitating the provision of a power unit for each individual well.

Generally the power unit has been provided with a crank which rotates in a ver tical plane to which crank have been secured in various ways the pull rods or other linking devices connected to the adjacent pumps. The present invention has particular reference to means for detachably connecting the ends of the pull rods to the crank of the power unit and its object is to provide, as an article of manufacture, a device which may be readily secured to a wrist pin of the engine crank and to which in turn may be readily attached the ends of the pull rods, the method of attachment being such that these rods may be readily disconnected. The device is light in weight though amply strong and is preferably a one-piece casting which may be fabricated at low cost and yet which has the qualities necessarily possessed by such an article to accomplish its function in a satisfactory manner.

The invention may be embodied in various forms one of which is disclosed in the following description when taken in connection with the accompanying drawings in which:

Figure 1 is a plan view of the device positioned on a wrist pin and having two pull rods connected thereto;

Figure 2 is an enlarged plan view of the devlce;

Figure 3 is a side plan view of the device: and V Figure 1- is a section on line 1 4 of Figure 3. it

The shaft of an engine or power device is indicated at 10, a crank secured thereonv at 11, and a wrist pin secured to the end of the crank at 12. Pull rods are indicated 13, 13, to the ends of which are secured hooks or catches 1 1, 1 1-, which in turn are detachably secured to theinember l) which is mounted for rotation on the wrist pin 12.

The member B has a hollow cylindrical portion 15 which is lined with babbitt 16 or other antifriction metal. The wrist pin '12 of course extends through and fits within this babbitt lining. Extending radially and in diametrically opposite directions from the central cylindrical portion 15 of member B are two arms or webs 17, 17, these webs terminating in disk-like portions 18 which have circular apertures 19 for the reception of the hooked ends of the catches 14, or for the reception of similar hooks or catches. It will be seen that the apertures 19 are not concentric with the outer peripheries of the circular end portions 18. The thickness of metal between apertures 19, 19 and the ends of member B is greater than the thickness of metal between. the apertures and the edges (Figure 2), this extra metal being provided to compensate for the wear which oc ours in the operation of the device due to the action of the catches 14:. The ends 15 of the cylindrical portion 15 extend beyond the edges of webs 17 and serve as spacing rings to prevent contact between the crank 11 and the portions 18 of the webs, as the shaft and crank rotate.

As the crank 12 travels in a circular path' and as there is some resistance to this movement exerted at right angles to the pull rods, some lateral force will be exerted on the device which will tend to flex the same and to break off the webs 17 from the portion 15. To strengthen the device laterally transverse ribs or flanges 20 are provided at both edges of the webs, these flanges serving to brace the webs from the cylinder 15. These transverse flanges are designed to provide an ample margin of strength against laterally exerted forces.

Preferably the device just described is fabricated of cast steel which provides a maximum strength for a given weight of metal and a given cost. Other materials may be used, if desired, and the device may be lined or unlined with babbitt as, thought best. It is possible to provide a device of this character with more than two arms or webs 17 so that instead of two pumps a greater number of suchpumps may be oper ated from a single power unit. In such cases the crank pin is, vertically disposed andthe crank rotates in a horizontal plane. Other modifications may be devised without depart in from the spirit of the invention.

aving thus described my invention what I claim as new and desire to secure by Let ters Patent is:

l. A device for connecting pull rods to wrist pins comprising a one-piece metallic memher having a hollow cylindricalportion to re ceive a wrist pin and armsextending outwardly from said cylindrical portion in diametrically opposite directions the ends of said arms being provided with means to permit the attachment o'lfpull rods-thereto and the cylindical' portion extending axially beyond the arms in both directions, for the purpose-set forth.

2. A device "for connecting pull rods to wrist pins comprisinga one-piece metallic member having a cylindrical aperture to re ceive awrist pin and arms extending outwardly from said cylindrical portion in diametrically opposite directions, the ends of said arms being provided with eyes or apertures to receive the hooked ends of pull rod securing devices, said eyes having thickened portions on the side remote from the cylindrical portion of the device, for the purpose set forth.

3. A device for connecting pull rods to wrist pins comprising a one-piece metallic member having a cylindrical aperture to receive a wrist pin and radially extending arms provided with eyes to receive pull rod hooks or other fastening devices, and strengthening flanges disposed at right angles to the axis of the cylindrical opening and integral with said cylindrical portion and said arms, for

strengthening the arms against laterally exerted forces.

In testimony whereof I hereunto affix my signature.

JOHN HART WILSON.

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