US1586493A - Mechanical movement - Google Patents

Description

May 25 1926.

B. M. WALKER MECHAN fCAL' MOVEMENT Filed Oct. 16 1925 INVENTOR.

BRUCE mmnukan ATTORNEYS.

Patented -May 25, 1926.

UNITED STATES PATENT orrler imucn M. WALKER, or OAKLAND, CALIFORNIA.

MECHANICAL MOVEMENT.

Application filed October" 16, 1925. Serial No. 62.841.

to in'iprovenm ts in and has particular changing the stroke This invention relates mechanical movements reference to means for of a connecting rod or pitman without stopping the machinery to which the same 7 balance ol' the machinery.

A further object is to provide simple means for the controlling of the device.

(Other objects and advantages \villbe apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

a do elevation of my device Figure I is the jack wheel of a. well as applied to drilling rig, v

Figurell is afragmentary side elevation of my device,

is a top plan view thereol,

Figure Ill Figure IV is a fragmentary cross scctional view of the gear arrangement, and

Figure V is a cross-sectional view showing the sliding block carrying the pin there on. i

it is often zulvautageous to change the stroke in a piece of machii'iery without stopping the machinery. At the present time in the drilling of oil wells it is necessary to stop the drilling apparatus in order to move .the pin to which the connecting rod is attached farther from the bar so as to give a longer stroke. This stopping delays the drilling action and istherei'ore expensive. There are some instances where it is necessary to have a slow" pumping operation while another pump is operated at high speed, and it is to accommodate for these variances that 1 have provided my present invention.

In the accompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 5 refers toa jack wheel or fly Wheel -eommonly employed in oilwell drilling operations, which wheel is secu'r zli on a shaft 6 mounted in suitable bearings 7 and 8 carried upon standards 9 and ll, respectively. This constriietion is common to all drilling operations.

it is customary to provide a crank which is keyed to the shalt (3 and to provide a plurality of holes in the crank into which the wrist pin to be later on described may be successively placed.

Instead of this construction, I propose to attach to the shat't 6 by a key 12, a block 13 which has chaml'ered edges l-l and 16. This block carries a head 17 through which shafts 15 and 19 project. and extend-parallel to the portion of the block. These shafts are each provided with a gear as shown at 21 and 22, respectively, over which a chain 23 passes. This chain is also rceved over a gear Qtsecurcd to a shaft- 26 also passing through the head 17 and carrying a bevel gear 27 upon its lower extremity.

This bevel gear 27 in turn meshes with gears and 29. liy referring to Figure 1V, it will be noted that the gear 28 is provided with an elongated hub 31. while the gear 29 is provided with a short hub 32 and that the gear 25) and its hub rotate upon the hub 31 of the gear 28. A brake band 33 is adapted to engage the hub 32, while a brake band 34 is adapted to engage the hub 31. These brake hands are operated by control rods 36 and 37, respectively, and may be actuated from any eonvenient'remote point. liy re lcrring to Figures l and ll, it will be noted that the shafts 18 and 19 are screw-threaded and pass through a block which block is slidablc upon the block 13. This blot-k carries a wrist pin 39 to which the coi'ineetiug rod ll is attached.

The result of this construction is that by manipulation of either the rod 36 or 37, the block 38 may be caused to move toward or away l'rmn the axis of rotation as follows:-

Assuming that the rod 36 is actuated so as to contract the brake band 33, the gear 29 will be held stationary with the result that the bevel gear 27 will rotate. This rotation will be transmitted through the shaft 26, gear 24, through chain 23 which will cause the shafts l8 and 19 to rotate and through their serewengagement with the block 38 will cause the same to move upon the block 13, depending upon the direction of rotation of these screws the shaft 6. By releasing the brake, rotation of the gear will cease and the block will be held securely in the newly adjusted position. By manipulating the other rod,

i for instance, the rod 37, the band 34 will be stationary.

tightened and the gear 28 will be held This will cause the rotation of the parts in a reverse direction, thereby causing the block 38 to, move in a direction opposite to the movement before described.

It will thus be seen that the objects above set forth are accomplished in a simple and efficient manner.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes in the shape, size and arrangement of parts may be resorted to Without departing from the spirit of the invention or the scope of the subjoined claim.

essence Having thus described my invention, I claim 2- In a device of the character described, rotating shaft, a block keyed to said shaft, a'sccond block slidably positioned on said first mentioned. block, a pair of parallel screws positionedv adjacent the first mentioned block and passing through said second mentioned block, the upper extremities of said screws being rotatably secured Within the head of said first mentioned block, a gear secured to each of said screws, a chain extending over said gears, a pair of bevel gears rotatably secured on said shaft, a third bevel gear meshing with said first mentioned bevel gears, means associated with said last mentioned gear for imparting rotation to said chain, and means for securing said spur gears independently against rotation.

In testimony whereof I afiix my signature.

BRUCE M. WALKER.

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