US1583767A - Fishing tool - Google Patents

Description

May 11 1926.

M. l. AKINS ET AL FISHING TOOL Filed Oct. 21, 1925 Irl/N Patented May 11, 1926.

- UNITED gSTATES Y APA nERRILL I. lmints, or BISHOP, Ann CHARLEsJ. Mosman,A oF y,oiRcU'Iug4 CALIFORNIA.

j FrsIrING `Toor.,

` Applicatin mea october 21, y1552-5.; seiiai No. 631,878.1'L

This invention relates to that classfof de- Fig. 3 is a detail-in' section-ofv the trip vices employed in grappling operations, and mechanism as seen ,Online of'Fig.j l,

particularly pertains to a tool which is espeoially applicable for use in removing lost under reamer cutters, bailer bottoms, tools, rods, broken drill stems and the like from wells. An object ofthe invention is top-rovide a fishing'tool by means of which objects lost in wells may be readily grappled and ,their recovery facilitated, and whichis simple in construction and el'iicient in operation. l

Another object is -to provide a tool of the abovek character which includes in its ensemble jaw members adapted to be set in a retracted position and to'be automatically released and brought into clamping engagement with the obj ect to be removed from the well on said object being disposed'in a position to be engaged by the jaw members.

Another object isto provide a simple and effective vtrip mechanism for holding the Vclamping jaw operating mechanism under tension in a retracted position, and adapted to be actuated by contactwith the object to be engaged by the clamping jaws to throwV the jawoperating mechanism into action. x Vith the foregoing objects in view, together with such other objects and advantagesas may subsequently appear, .the inventionresides generally in the provision of a pluralityf of :pivotally mounted jaw members in the form of levers, with a spring-pressed .wedge vmember jadapted to etfect operation'of the j aw membersv to bring them into clamping engagement with an object, and further resides in a trip adapted to be tripped tovholdthe spring-pressed wedge member in a retracted inoperative position and adapted to' be actuated by being brought into contact with the object to be grappled by thev jaws to release the spring-pressed wedge member.

- The invention further resides in the parts and in the construction, combination and arrangement of parts hereinafter described -and claimed, and illustrated by way ofV eX-` ample in the accompanying drawings, in Whichzf Fig. l is a view of the fishing tool as seenv advanced position;

showing the same in retracted position. VF 1g. li 1s a detail in section` offthe trip mechanismA as seen on the lined-#i of Fig.

end of whichis adapted to be engagedwith a drill stem whereby the tool maybe lowi-l eredinto a kwell in the usual manner.- Slide ably mounted on the shank A- is a taperedl sleeve B constituting a wedge against whichr bears a spring Cwound around the shank A and seating at its upper'end on a collar 'JD affixed tothe stem A loy setscrews E. rEhe spring-.C is designed to urge the sleeve B downwardly on the shank. if yNleans are providedfor holdingy the sleeve B in a retracted position with the spring-Cy under tension, whichmeans embodies aca-tch F consisting o'faloose pin mounted. in'an inclined slot G formed in the shank the pin F being adapted -to bepositioned with its outer end projecting a short vdistance bei yond the outer'surface ofthe shank; soaithat the lowerV edge of the sleeve B vwiill'fseat. thereon, Yas particularlyi shownin vFig. `3. Thepin F is held against advance move-l mentl under pressure of' the sleeve B by means of qa' plunger yhead H reciprocably mounted in a bore: J formed in-:thelolwerv terminating in a head O.

A series ofclampingijaws Pl are mountedrv on the lower end portionlof-y theshank A, each ofwhich jaws is -in the form of ale'ver which extends in substantiallyavertical di#k rectionV and isgpivoted at Q, withl its iupperf,

` end `portion projectingalongside.` they shank.

Kand curved outwardly as indicatedat R37 the lowery VYend. vportion projecting downwardly and terminating beyond the lower vend portion of the rod N Y and being provided near vits terminus with a, series `of-upwardlyH 'i and inwardly inclined spurs', S, The clampend of which is open and terminates adja- (ill cent the lower end of the-clamping jaws. The upper end of the shell T is affixed to the shank A. Y

In the operation of the invention the device is set by retracting the cone sleeve B in opposition to the spring C and positioningY the pin F in the. inclined slot G with its outer' end portion projecting beneath` the lower margin of the tapered sleeve D and positioning the plunger head H so that the inner end of the pin F will abut against the outer cylindrical wall of the latter, as par ticularly shown in Fig. 3. The outer end of the pin F is rounded and the lower vend of the sleeve B seats thereon so that the sleeve D under the urge of the spring C tends to shove the pin F inwardly. kInward movement of the pin F, however, is prevented by reason of its inner end abutting against the plunger head I-I; the pin F being of such length that when its rounded outer end is positioned to project slightly beyond the outer surface of the shank A into engagement with the sleeve B, the .inner end portion thereof will abut against the plunger head I-I.

When the parts are thus disposed the push rod .N will be positioned with' its head portion O located adjacent the lower end of the cylindrical shell B and spaced a short distance inwardly from the lower ends of the jaw members P, vas shown in Fig. l. The curved upper end portion R of the clutch members .will then be positioned adjacent the .lower end of thesleeve B and the lower end portions of the jaw members will be disposedin an outermost vposition adjacent.-

the inner surface of the shell T in which pomembers `are beveledupwardly and inwardly so Las tov form a wedge or taper which will facilitate'passingof the'fcylinder over and around the object to be removed `from the well bore, and to position the lobject within l the shell and between the jaw members so that the lower end of vthe push rod will abut thereag'ai'nstin such fashion as to hold 4the rod against-movement and permit 'the` shan-k A to be moved downwardly relative thereto and carry the pin F beyond thelower edge of the plunger head, whereupon the pin F will be forced inwardly by the pressure of the sleeve B on the outer end thereof so as to release the sleeve B and permit it to move downwardly under the urge of the spring C. Downward movement of thesleeve B effects a wedge action on the upper end portions of the jaw members whereby the latter are rockedon their pivots Q, lin opposition to the springs U to advance the lower end lportion of the jaw members inwardly toward each other and into engagement with the object encompassed thereby so that the object thus engaged may be withdrawn from the well bore together with the fishing tool,

`While I have shown and described a specie embodiment ofk my invention, it is subject to various modifications, and accord-y ingly, I do not limit myself to the exact details of construction and arrangement shown but may resort to such changes .as come within the scopey of the invention and within the meaning of the appended claims.

l. In a fishing tool, comprising a shank, a plurality of jaw members pivoted onsaid shank extending below the lower enoll thereof, said jaw .members beingprovided with upper end portions projecting above their pivotal mountings, a tapered sleeve .sli'dably mounted on said shank -extending betweenl the shank and the upper end portions of the jaw members, a spring operable 'to advance said sleeve, a slidable pin carried by lsaid shank adapted to be positionedto extend beneath said sleeve to hold the latter in vits retracted position, a push rod carried by said shank and extending downwardly between said jaw members, meanson sai-d push rod for holding said pin against movement under pressure imposed thereon 4by said sleeve and operable on longitudinal move'- ment of said 'push rod relative to-the yshank to release said pin to permit the latter to mov-e under the urge of said sleeve to a position out of engagement with the latter.

2. A fishing tool compri-sing al shank, a plurality of jaw members 'pivoted -on said shank `extending below the end thereof, a cylindrical shell carried by said shank and encompassing the j aw'members having an open lower end terminating 'adjacent the lower ends of the jaw members, Vsaid jaw members being provided with upper and end portions projecting above their pivotal mounting, a tapered sleeve slidably mounted on said shank'and extending`between the shank and the upper endA portion of the jaw members, a spiral spring wound o-n said shank and bearing downwardly on said sleeve, a pin slid'afbl'y mounted in an inclined slot adapted to be positioned Ato engage the sleeve when the latter is in a retracted position, a plunger head reciprocably mounted ina longitudinal bore formed in the lower endportion of said shank operable to control said pin, and a push rod carrying said plunger head and projecting between said jaw members.

3. A fishing tool comprising a shank, formed with an end bore, a push rod longitudinally slidable in said bore projecting below the lower end of said shank, a stem carried by said push rod arranged inl said. bore, a head on said stem, a pin slidably mounted in an inclined slot in said shank, adapted to be positioned with its inner end abutting against said head, said pin being formed with a rounded outer end portion. a spring-pressed wedge slidably mounted on said shank to be positioned to be engaged by said pin, and a plurality of vjaw members pivotally mounted on said shank and depending below the lower end thereof around said push rod, and means for holding said jaw members in a retracted position; saidv j aw members being provided with upwardly extending end portions arranged to be e11- gaged by said wedge member on advanced movement of the latter to actuate saidujaw members. y

4. In a iisliing tool, a shank, a springpressed slidable sleeve on said shank, a pin engageable with said sleeve to hold. it in a .retracted position, said pin being arranged to tend to move longitudinally under urge of said sleeve, means for opposingmoverment of said pin adapted to be actuated to permit advance of the pin under pressure of the sleeve to release the latter, and jaw members operable by advance of said sleeve.

5. In a fishing tool,'a shank, a springpressed slidable sleeve on said shank, an obliquely arranged slidable pin carried by said shank adapted to be disposed to abut against said sleeve and tending to move under the urge of said sleeve, means for opposing movement of said pin operable to release same to permit movement of said sleeve, and jaw members operable 'by advance of said sleeve.

CHARLES J. MOYER. MERRILL I.k AKINS.

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