US881496A - Pipe-grab. - Google Patents

Description

W. s. SEAMA 4PIPE GRAB APPLICATION FILED SBP A PATENTED MAR. 10, 1908.

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/I L" y GRM/umg wALTEE sco'r'r sEAMAN, 0E BEAVER, NORTE DAKOTA.

PIPE-GRAB.l

Specication of Letters Patent.

Patented March 10, 1908.

Application. led. September 11, 1907.` Serial No. 392,311.

` To all whom 'it may concern.'

Be it known that I WALTER Soo'r'r SEA- MAN, a citizen of the nited States, residino` at Beaver, in the count ofv Bowman an State of North Dakota, have invented certain new and useful Im rovements 'in Pipe- Grabs, of which the follldwing is a speciiication.

. My invention ertains to improvements in pipe grabs, use `in the drilling of wells to recover lost or displaced i e sections, and has for its object to simpll' the construction, increase the efficiency and to lessen the cost of production of devices of this type, and

to rovide a thoroughly ractical pi e grab. ith the above and'other objectslin view,

' my invention further consists in the. novel bases 6. To provide for this movement as.

details of construction and combination of parts to be fully described4 in. the following specification-and lpointed out in the claims.

Referring'to t e accompanying drawings forming a part of this specification, and wherein like characters of reference denote similar parts throughout the several views Figure 1 isa central vertical sectional view, and' Fig. 2, is a transverse section taken Aon line 2-2.of Fig. 1. j

The 'invention contem lates a casing 1, preferably cylindrical in orm, which has a closed lower end and a cap 2, of any desired type, removably fitted to 1ts upper end. At

a point adjacent the bottom of the casing a stationary plate 3, is secured by means of screws or the like.

4, Vdesi ates operating rod,4 ther-.upper end of" "ch is passed throu'h an openm provided therefor in ca 2, an the lower en of which is. threade and received in a threaded opening formed therefor in plateS. A hand wheel 5, is secured to the upper end of rod 4.

Secured to the upper face of plate 3, are the feet 6, of the jaw members 7, the latter embodying vertically arranged -shanks which terminate in outwardly turned ends 8, having serrated faces 9, which are'adapted to engage the inner face of the pipe 10, as depicted in the drawings. To accommodate the ends 8, of the jaw members, is formed with slots 11, through which ends 8, project. The jaw members 7, are formed I of spring-like material so that the serrated faces of the same may move outwardly and inwardly with respect to casing 1, and their well as to cause' the serrated faces to iirmly bers.

. outwardly cated to rod 4, the latter will the casing 1,

grip the pipe during the removal of the latter, I employ anabutment 12, which is formed to occupy the interior of casing 1, and to have a central longitudinal opening through which operating rods 4, free y passes. Collars 13 and 14, are firmly sustained on rod'4, and engages the opposite ends of abutment 12, to thereby prevent longitudinal movement of the abutment with res ect to rod 4. The abutment'is formed wit twofopposite vertical slots 15, which receive the jaw members therein, these slots being of such width as to freely receive the upper ends .of the jaw mem- The bottoms of the slots are formed with cam faces 16, which bear against the rear of the outturned ends V8, of the jaw members 7, and thus when the abutment is lowered with respect to the jaw members, the ends 8, of the latter will be gradually forced with the pipe 10.

To assist the jaws in their function of gri ing the ipe during the removal of the latter, l) provi e a compressible and expansible washer 17, of a size which when forced into pipe 10, will expand and grip 4the pipe to thereby further assist the action of jaws 10. This washer bears against the bottom of casing 1, and is removably secured thereto by means of a metal washer 18, and screw 19,

.which latter is in threaded engagement with the casingbottom.l

The operation will be understood from the above; rotary movement be' communi- ,Y e raised or lowereddue t'its threaded connection with stationary plate 3, carrying abutment 12 therewith. Since abutment 12, freely receives rod 4, the latter will not communicate its rotary motion thereto. By adjusting the position ot the abutment with respect to the jaw members the latter may be caused to grip the pipe being removed as may be found necessary or desirable. Washerv 17, serves to also properly center the lower end of casing 1, and assists in enabling the device to obtain further gripping action on the pi e in addition to that secured by the jaw mem ers.

What I claim is 1. A pipe grab embodying a casing, jaw members carried by said casing and projecting be ond the sides thereof, and an adjustable a utment in said casing bearing against said jaw members.

2. A pipe grab embodying a casing, a plate stationary therein and having a threaded into rm gripping engagementV opening, jaw members supported at their lower ends from said plate and having their upper ends serrated and projecting beyond the casing sides, an operating rod having a threaded part engaging said threaded opening of the plate, and an abutment loosely mounted on said rod means to cause said abutment to partake of the longitudinal movement of said rod, said abutment having cam faces which bear against said'jaw members and force the same beyond said casing Sides-'A b b d s 3. egrav emo `i n acasin ,aexible wasiidi on the bottoin nd of tle casing projecting beyond the casing sides, means to clamp said washer to said casing end, and means at the opposite end of the casing to engage the pipe.

4. A pipe grab embodying a casing', an expansibl'e washer secured to the exterior of the l ottom of said casing, jaw members secured at their `lower ends on the casing interior and at their upper ends projecting beyond the exterior o the casing, and means or impelling said upper ends of the jaw members outwardl pipe grab embodying a casing, an ex- Ypans'ible washer secured to the lower end of the casing and projecting beyond the sides thereof, aw memberscarried b said casing and having gripping faces whic project beyond ythe casing sidesat the upper ortion of the casing, and means to move sai gripping faces outwardly beyond the casing sides.

6. lA ipe grab embodying a casing, a iiexible was er immovably carried on the bottom thereof to engage the pipe, means carried by the casing adj acentl the upper portion ythereof toalso engage the pipe, and means to actuate' sald last-named means.

7. A pipe grab embodying a casing, a plate rigidly secured therein and having a threaded opening, jaw members having gripping faces projecting beyond the casing sides, a rod threaded at one end into said opening of the plate, and means on the rod to engage said jaw members and move the gripping faces thereof outwardly.

8. A ipe grab embodying acasing, a plate therein aving a threaded opening, vertically dis osed jaw members secured at their lower ends 'to said late and having right angular upper ends w ich project beyond the casing sides and terminate in grip ing faces, an operating rod having a threaded part engaging said threaded opening of said plate an abutment freely carried by said rod and having vertical slots therein in which the u per ends of said jaw members extend, cam aces carried by said abutment to engage the rear portions of said right angular ends of the jaw members, and means on `the rod to engage said abutment and prevent longitudinal movement thereof on said rod.

9. A pipe grab embodying jaw members, and an operating rod therefor carrying means to engage said jaw members and im el the same outwardly, said means being oosely mounted on said rod, means whereby said means will move with said rod and means whereby when said rod is rotated the same will be advanced so as to advance said means for actuating the jaw members.

In testimony whereof I affix my signature,

p in presence of two witnesses.

WALTER SCOTT SEAMAN.

Witnesses:

J. A. WETHERILL', A. LAKE.

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