US1544041A - Well drilling and fishing jar - Google Patents

Description

' June 30, 1925.

J. P. SCHIRNHOFER WELL DRILLING AND FISHING JAR File ad May. 25, 1924 Patented June 30, 1925 F I C E JOHN P. SCHIRNHOFER, OF PAINTSV'ILLE, KENTUCKY.

WELL DRILLING AND FISHING JAR.

Application filed May 23,

T0 all whom it may concern:

Be it known that I, JOHN P. SCHIRNHO- FER, a citizen of the United States, residing at Paintsville, in the county of Johnson and State of Kentucky, have invented certain new and useful Improvements in Vvell Drilling and Fishing Jars, of which the following is a specification.

This invention relates to well drilling and fishing jars, and it consists in the novel features hereinafter described and claimed.

An object of the invention is to provide a jar structure of simple and durable form and especially adapted to be used in drilling a well to start the bit in hard formation and which will serve to cause the bit todrill the well hole of uniform diameter. The jar structure may also be used to advantage for loosening a tool which has become stuck in the hole.

A further object of the invention is to provide a jar structure in which tliense of a manila line is eliminated and in lieu thereof a wire cable section may be used thus materially strengthening the structure.

A still further object of the invention is to provide a jar structure in which the several parts may be readily disconnected from each other and in the event that any of the parts become unservieeable, they may be discarded and new parts substituted in their stead without dispensing with all .of the serviceable parts of the structure.

In the accompanying drawing:

Figure 1 is a vertical longitudinal sectional view of the jar structure.

Figure 2 is an enlarged fragmentary detail sectional. view thereof.

Figure 3-is a face view of a collar used in the jar structure.

As illustrated in the accompanying drawing, the well drilling and fishing jar structure comprises a member 1 provided at its upper end with a. threaded stud 2 adapted to be engaged with a drill rod (not shown) in a usual manner. The member 1 is pro vided with a socket 3 which leads in from the lower end thereof. The member 1 is provided at its oppositesides with aligned openings 4 which are spaced above the lower end of the said member and which communicate at their inner ends with the socket 3. A set screw 5 is threaded in the intermediate portion of the member 1. A collar 6 is housed within the socket 3 and the inner end of the screw 5 impinges against the side 1924. Serial No. 715,372. of the collar and holes the same in a fixed position in the socket 3 of the member. The collar 6 is provided at its upper side with a recess 7 which snugly receives the lower portion of a block 8. The block 8 is provided with a central opening having converging side walls 9. v

A section of wire cable 10 passes through the collar 6 and through the opening in the block 8 and a wedge 11 is inserted in the upper end of the cable, thereby the same and forcing the into close contact with the spreading sides of the cable converging walls 9 of the opening in the block 8. lidisk 12 is mounted upon the cable 8 below t e collar 6 and bearing balls 13 are interposed between the said disk and the collar. A sleeve 14 is threaded in the lower portion of the socket 3 and is provided with a shoulder 15 which bears directly against the lower end of the member 1. A coil spring 16 is housed within the socket 3 and is interposed between the upper end of the sleeve 14 and the under side of the disk 12 and serves as means for holding the disk 12 and the bearing balls 13 toward the collar 6. The cable section 10 is threaded through the sleeve 14. The sleeve 14 is provided at its lower end with a diametrically enlarged socket 17 which receives the upper end of the sleeve 18. The sleeve 18 may turn in the socket of the sleeve 14. vIn the event that the cable section 10 should elongate, said slteves may have relative longitudinal movement and when the relative longitudinal movement becomes excessive, the nut 5 may be loosened whereby the spring 16 will take up the slack in the cable and the sleeves will be drawn in close contact with each other and the nut 5 may be retightened. The. sleeve 18 is provided with a shoulder 19 which bears directly against the lower end of the sleeve 14. The cable section 10 is also threaded through the sleeve 18. The sleeve 18 is provided at its lower end with a socket 20 which snugly receives a block 21. The block 21 is provided with a central opening 22 having con verging side Walls and the lower end of the cable section 10 passes through the opening in the block 21. A wedge 23 is inserted in the lower end of the cable section 10 and spreads the same against the converging walls of the opening 22. The lower end of the sleeve 18 is internally threaded as at 24 and a tool bit (not shown) may be engaged with the sleeve 18 at the thread 24 in a usual rod of undue strain and stress.

manner. When it'is desired to unscrew the sleeve 14 from the member 1, a rod (not shown) may be passed through'the aligned openings 4 whereby one end of the spring 16 may bear against the said rod and consequently when the sleeve 14 is unscrewed from the member 1, the spring 16 will be retained in the same member. 7

The structural arrangement is such that the spring 16 will at all times hold the members of the anti-friction or ball bearing structure in proper position with relation to each other and will at all times hold the cable 10 in a stretched or taut condition whereby the sleeves 14 and 18 are held against relative longitudinal movement and at the same time the said sleeves may turn with relation to each other.

The operation of the device is as follows: The threaded stud 2 at the top of the device is tapped into the lower end of the operating rod of a drilling machine of conventional form. The machine to which the device is attached is of the reciprocating type and it is obvious that the device is moved up and down in the hole. During this vertical reciprocatory movement, the lower sleeve 18, to which the drill (not shown) 'is attached is permitted to swivel through the medium of the cable and a ball bearing structure. Also, the sections 18 and 14 are permitted to move longitudinally with respect to each against the action of the spring 16 to relieve the operating drill Practice has shown that in the ordinary solid onepiece structure now commonly used, the

hole bored or drilled in the ground 1s sometimes quite irregular, however, by pro' viding a structure wherein the parts are longitudinally movable with respect to each otheragainst the tension of the spring and permitting these parts to swivel with respect to each other, it has been found that a drill hole of uniform diameter is the result.

Whereas the device is given a comparatively short stroke while drilling holes, the stroke is increased somewhat when it is used as a fishing jar. In using the device for the purpose last stated and assuming for instance that the bit is down feet in the hole and gets stuck, it takes a one thousand comparatively hard jerk to loosen the bit because the weight of an ordinary device of the character described is about twenty-' five hundred pounds. Obviously, without the extensible spring feature of my device, the machine above the surface would be subjected to considerable strain, but by permitting the swivel and sliding connection between the parts of the device, the machine is relieved of shocks and jars. As soon however as the spring is tightly compressed and'further relative sliding parts of the device is stopped, a further pull on the operating rod, or line, whichever is used, servfis to loosen the bit which has become stuc Having described the invention, what is claimed is:

1. A well drilling jar structure comprising a socket member, a sleeve screwed therein, and provided at its lower end with a socket, a second sleeve fitting snugly in the socket-of the first mentioned sleeve and provided at its lower end with a socket, a block secured in the socket of the first mentioned member, a block located in the socket of the second mentioned sleeve, a wire cable section secured at its ends in the blocks and passing through the sleeves, a disk housed in the socket of the first mentioned member, and a spring housed in the socket of the first mentioned member and interposed between said disk and the first mentioned sleeve.

2. A well drilling jar structure comprising a socket member, a collar located there- 1n, her, a block carried by the collar, a disk housed in said member, bearing balls interposed between the disk and the collar, sleeves having sliding engagement with each other, one ofthe said sleeves being screwed in the socket member, a spring interposed between the last mentioned sleeve and the disk and housed within the socket, and a wire cable passing through the collar, the disk, the spring, and the sleeves, and secured at one end to the lower sleeve and at the other end to the block.

In testimony whereof I aflix my signature.

(JOHN P. SCHIBNHOFER.

means for fixing said collar in said mem-

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