US1381529A - Overshot fishing-tool - Google Patents

Description

G. WHITMEH.

OVRSHOT FISHING TOOL.

APPLICATION FILED 1AN.2.1920.

Patented June 14, 1921 n THM GEORGE WHITMER, or BREA, cALiroRNia ovERsHor FISHING-Toor..

Specification of Letters Patent.

Patented June 14.1921.

Application med January 2, 192e. seriai miam-,atm

TeaM-fw aurait concern Be it known that I, GEORGE WHITMER, a citizen'- of the'A United States, residing at Brea, in the county of Orange and State of California, have invented new and useful Improvements 4in Overshot Fishing- Tools, of which the following is a speciiication.

This invention relates to apparatus for use inthe removal or recovery 'of parts of well apparatus, and has for its object to provide an improved overshot fishing tool, and the invention consists of the construction and details an embodiment of which is illustrated in the .accompanying drawings and described and claimed herein.

Figure 1 is a plan view of the improved tool.

Fig. 2 is a central longitudinal section on line 2-2 of` Fig. 1.

Fig. 3 is a sectional -view showing the application of the tool.

he invention, in its illustrated embodiment, comprises an exterior and substantially constructed sleeve or carrier 2, here shown as of cylindrical form, and having internal threads 3 at its upper end to,y be

connected detachably to a line of tubing indicated at 4, Fig. 3, by which the carrier 2 is designed to be lowered down into the well casing to the desired height.

The -lower end of theAcarrier shell 2 is externally threaded as at 5 and is adapted to be attached thereby toa skirt or bellsha ed member 6, Fig, A3, to facilitate the gui ing of the tool in the well casing and also to facilitate theguiding of thedeyice over which the carrier is to be moved into the bore 7 of the lower end ofthe shell 2, this bore preferably having a downwardliy and outwardly divergent mouth 8 for gui ing purposes.

A particular feature 'of the present invention comprises a series of durable and yield.- able dogs yor gripping members arranged 1n"- a peculiar manner; in the-interior of the carrier 's hell 2 and,l Stich dogs aremoperative to sprin "'jaround "external shoulders or other ing parts'fonf-the part inthe well that "'f'withdrawnjand that is fished for .provedfffoL y. ,presentlicas'e the gripping members or dogs- `fi'isist of straight bars10 preferably'ofspring steel the inner faces of which may beconca'ved as at 11 so that'whe'n a series lo i'the dogs 10 are arranged in given positions around the interior` face? o f' the carr1er'2 ltheir upper ends-form substantially an expansible' ring as indicated' in Fig.- 1. T hese straight spring dogs or bars l0 are disposed longitudinally in the bore or chamber of the carrier and have their lower ends secured .by bolts or other suitable means 12 Y to the wall of the carrier, such walls perforated as at 13 to receive the bolts or screws the heads of whichare readily accessible by a tool of suitable character that may be inserted into a courtersink 14 provided about the head of'each of the screws 12.

vIn order to secure the proper or desired inclination of the 'se-ries of straight bars 10 the portion of the surface against which these bars seat is turned conically, the conical surface converging upwardly as indicatedl at 15 in Fig. -2 and terminating as indicated at a line 16 that is arbitrary and over which line the carrier 2 is provided with a cylindrical bore 17, although if desired this bore'may assume a divergent contour from the line 16.

The base of the conical seat portion 15 intersectswith an inwardly extending shoulder 18 terminating the upper` end of the bore or mouth 7 of the carrier 2 and which shoulder 18 serves to carry a part of the load and also to facilitate the assembling of the dogs or bars 10 in the carrier or shell 2; ther-m lower ends of the dogs abutting against the said shoulder 18z From the above itwill be seen that the dogs 10 being substantially straight in longitudinal structure ma be inexpensively manufactured and readily assembled and that they are given the desired convergent relationby reason of .the angular surface 15 against which they` are' held by their fastening screws 12. The upper ends of the several yielding dogs 10 are shown as terminating in av common diametrical plane at about the upper end of the carrier 2.

In use of the device the skirt or ide bell 6 is attached to the lower end o the carrier and the latter vis attached to the adjacent end of the line of tubing .or pipe 4 and is then lowered into the .well to suche' position as will be '.determined .b theV loca? tion of the part as Vthe tubing fto bel re-v moved. Usually the tubing T isc'onstructed of a .series of .sections united by` ceupling rings C, and vwhen the 'carrier 2 has been lowered to 'the desired degree the dogs 10' snap 'intoengagement below the 'shoulder formed by the bottom ed e of one ofthe couplings C and then the shing tube 4 together with its carrierQ can be lifted` by the usual the grappled or` interlooked part as the tube T will be lifted up from the well.

Various changes may be made without departing from the spirit of my invention as claimed.

I claim: t A fishing tool for wells comprisin a device adapted to be suspended in a we l, said draw Works or other means and device having an interior couver ent surface, bars of spring material mounte at against said convergent surface at one end and securedithereto so that the free ends incline toward one another and are free to s ring outwardly, the attaching means for sai hars including bolts received through openings in said suspended device and threaded into said bars. Aln testimony whereof I have signed my name to this specication.

GEORGE WHITMER.

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