US1351744A - Overshot - Google Patents

Description

R. A. DAILEY OVERSHOT.

APPLICATION FILED on. n, 1919.

Patented Sept. 7 1920,

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OVERSHOT.

APPLICATION FILED OCT. 11, 1919.

1,351,744. Pat/gntedfiept. 7, 1920.

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lNl/E/VTOR R.A.Da I: le y A TTORNEYS nor A. BA LEY, or TAFT, cnnrrormm.

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' Specification of Letters Patent. Patented Sept. 7, 1920.

Application filed October 11, 1919. Serial No. 330,006.

T 0 all whom it may concern:

Be it known that 1, Roy A. DAILEY, a citizen of the United States, and a resident of Taft, in the county of Kern and State of California, have invent-ed certain new and useful Improvements in Overshots, of which the following is a specification.

My invention is an. improvement in overshots, and has for its object to provide a device of the character specified, adapted for fishing broken tools from a well casing, wherein a body portion is provided having slips or dogs for engaging the tool to hold the same, together with various types of interchangeable bowls for facilitating the engagement of the overshot with various characters of break.

In the drawings Figure 1 is a longitudinal section of the tool,

Fig. 2 is a top plan view,

Fig. 3 is a side view of one of the interchangeable bowls,

Fig. 1 is a longitudinal section of another yp Fig. 5 is a front view of one of the slips.

In the present embodiment of the invention, a body portion 1 is provided of cylindrical form, and of suitable length, the said body being internally threaded at its upper end as indicated at 2 for engagement by means for operating the overshot, as for instance, pipe. At its lower end, the body is reamed or counterbored and internally threaded as shown at 3 for engagement by the bowls to be described.

The bore of the body is enlarged intermediate the ends of the body as indicated at 4:, and a shoulder 5 is formed at the lower end of the enlarged portion whose plane is perpendicular to the axis ofthe body. The

shoulder 6 at the upper end ofthe enlarged portion is inclined as shown. Each of the slips has a plate 7 of rhomboidal form, having at the center of the base a lug 8 which is apertured to receive a pivot pin 9 for pivotally connecting the slip to the body.

Referring to Fig. 1, it will be seen that these lugs 8 and these slips are provided,

the said slips being arranged at angles of.

with respect to each other. Each of these slips is normally pressed toward the center of the body by a plate spring 11 which is arranged between the slip and the body, and is secured to this'slip intermediate its ends as indicated at 12, the ends/of the spring engaging the inner face of the bod The slips at their small ends are spaced apart at their adjacent edges at angles of approximately 30, so that they offer no impediment to the free flow of water through the overshot. A series of bowls is provided for connection with the body, one of these bowls shown in Fig. 1, being a cylindrical structure 13 having a threaded external reduction at its upper end for engaging within the counterbore 3. I

The lower end of this body portion has teeth 15 which are inclined with respect to the axis of the bowl, so that they tend to move the tool inwardly toward the axis of the casing when they are engaged therewith. The bowl shown in Fig. 3 is a bell-shaped member 16 having a reduced portion 17 for engaging the body, and one side of the bowl is cut away at the large end as indicated at 18, to permit the tool to enter the bowl laterally. The bowl 19 shown in Fig. 4. is a plain cylinder, having its lower end reamed as shown at 20 and having its upper end reduced and screw-threaded as shown at 21 to engage within the bowl.

When the casing is broken off unevenly, the bowl shown in Fig.1 is used, the teeth are out on an angle such that whenthe bowl is rotated, the teeth tend to force the casing to the center of the bowl. The bond shown in Fig. 3 is for use in straightening up pipe where it is leaning against the-side of the hollow. The bowl shown in Fig. 4 is used on sucker rod joints and on pipes which have stripped threads. v

The overshot is lowered into the well hole, and rotated over the broken pipe. The pipe passes up through the overshot until the slips come into contact with the coupling, and the coupling forces open the slips. After the coupling passes over the slips, they are forced back beneath the coupling, giving a firm hold on the lost pipe. The improved overshot can be used to catch sucker rod joints where the rod has stripped the thread, broken off or come unscrewed.

Any style of bowl can be used, and when between the slips permits the water to be pumped down to wash'away the mud allowing the slips to work more freely. Since the slips are hinged, when they come in con tact Withshvers on the pipe, they are forced back against the body of the overshot.

I claim An overshot fishing tool comprising a oylindrical body, a'plurelity of rhomboidal slips disposed therein and tapering up wardly end having their upper edges formed with arcuate depressions, an 1nte- "body.

passing through said lugs and pivoting the slips, and a plate spring secured externallyto each slip and engaging the wall of the ROY DAILEY.

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