US1836680A - Slip - Google Patents

Description

Dec. 15, 1931.

J. D, NIXON 1,836,680

SLIP I Filed Sept. 15, 1950 2 Sheets-Sheet 1 duommqd Patented Dec. 15, 1931 UNITED STATES JEDDY D. NIXON, OF HOUSTON, TEXAS SLIP Application filed September 15, 1930. Serial No. 482,042.

This invention relates to a novel type of scribed in which the jaws are so assembled in the carrier that the jaws will assume the weight of the load carried by the slip and the carrier will be relieved of the weight of such load. 9) A still further feature of the invention resides in the provision of a slip of the character described, wherein the jaws-are so assembled with the carrier that in case of break- ,age of the jaws the parts will be held in 35 the carrier without liability of dropping into the hole and the assembly is of such construction that the jaws may be readily assembled with the carrier and retained therein against dispacement therefrom but may be readily removed in case of breakage or wear and replaced with new ones. It is still another object of the invention to provide a slip whose parts may be assembled and maintained in assembled relation without the use of bolts or nuts or other parts that are liable to become broken, lost or displaced in use.

The slip is also of such construction that it may be engaged about a pipe having different 49 outside diameters by suitably adjusting the slip in the seat provided therefor in the rotary table or other support.

With the above and other objects in view the invention has particular relation to cer- 5 tain novel features of construction, operation and arrangement of parts, and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein: Figure 1 shows an inside elevational view of one section of the slip located in a rotary table seat, and

Figure 2 shows a plan view thereof, showing one section of the slip in section, taken on the line 22 of Figure 1.

Referring now more particularly to the drawings wherein like numerals'of reference designate similar parts in each of the figures, the numerals 1, 1 designate confronting sections of the carrier. Each section is arcuate in cross sectional contour and the external surface of the carrier sections tapers downwardly to conform to the pitch of the seat 2 of the rotary table or other support 8. The lower end of the carrier sections is inwardly beveled, as at 4, to readily seat in said seat. I

Each carrier section has a plurality of radially extending slots as 5 extending vertically therein, forming jaw bearings and at the respective ends of said slots the carrier has the upper and lower inwardly extending arcuate shoulders 6. 7, in alignment with the upper and lower ends respectively of said slots.

There are the pipe engaging aws 8 which work radially through the respective slots 5 and. extend vertically substantially from end to'end of said slots. The inner edges of the respective jaws are widened present 5%} ing the toothed arcuate faces 9 to the pipe 10 to be held and these pipe engaging faces engage said pipe uniformly all the way. around so as to preventthe pipe from becoming distorted or misshapen by the slip.

In assembly the jaws are inserted through the slots 5 from inside outwardly and said jaws are retained in the carrier, sections by means of the vertical side ribs 11 which are welded to the outer margins ofthe jaws, J one on each side.

Adjacent each side of each slot 5 the carrier sections are provided with the external vertical grooves 12 which are substantially g5 coextensive in length with the ribs 11 and in which said ribs seat when the jaws are moved inwardly into their inner positions. The widened inner margins of said jaws en gage the inner side of the corresponding subjected to the weight of the load. Each section of the slip may be handled independent of the other section through the U- shaped handle 13. The upper end of each section of the carrier has the transverse spaced, bearing grooves 14 extended therein inwardly from the outer periphery thereof and bearings 15 of the corresponding handle 13, are i tted into said grooves and pinned therein by means of the bearing pins 16 which are fitted into the keyways 17, provided for that purpose, and extending through said handle bearings. These pins may be retained in place by the annular abutments 18 welded around the wall of the corresponding key ways adjacent the outer ends of said pins. If it be desired to remove a handle 13 the abutments 18 may be readily drilled out and the pins 16 removed.

In case a jaw should become broken, the parts thereof will be retained assembled with the carrier and will not be liable to drop out and drop into the bore. If it be desired to remove a broken jaw or a worn jaw the corresponding ribs 11 may be readily removed by any approved process and said parts removed and replaced with new ones.

t will be observed that the jaws 8 havea considerable range of radial movement with respect to the carrier so that in handling a pipe such as a drill stem, a slip of suitable size for engaging the-stem between the couplings ortool joints may be used and this slip will also be suitable for engaging around the tool joints or drill collar of larger diameterthan the ordinary stem sec tions by suitable adjustment of the slip in the tapering seat 2.

The drawings and descriptions disclose what is now considered to be a preferred form of the invention by way of illustration only while the broad principle of the invention will be defined by the appended claims. 7

WhatI claim is 1. A slip formed of sections, each section being composed of a one piece carrier having spaced radial slots, and pipe engaging jaws radially movable in said slots and having their inner margin widened.

2.-A slip formed of sections, each section comprising a carrier arcuate in horizontal cross-sectional contour and having radial, vertically extending slots, spaced apart therearound, andpipe engaging jaws working.

radially through said slots and having stops to limit their inward movement.

3. A slip formed of sections, each section comprising a carrier having spaced radial slots, and pipe engaging aws radially movable in said slots and having their inner margins widened, and means for independently moving said respective sections.

4. Aslip for holding pipe and the like, including confronting, arcuate, carrier sections, each section having radial, vertically extending slots spaced apart and forming jaw bearings, jaws shaped to work snugly through said bearings and whose inner margins are widened and have engaging teeth.

5. A slip for holding pipe and the like, in-

T eluding confronting, arcuate, carrier sections,

each section having radial, vertically extending slots spaced apart and forming jaw bearings, jaws shaped to work snugly through said bearings andwhose inner margins have engaging teeth, and inner and outer abutments on the jaws to limit the outward and inward radial movement. v

6. A slip for pipe, andthe like, and formed of sections, each section comprising a carrier section arcuate in cross sectional contour and provided with radial, vertically extending slots forming jaw bearings, jaws shaped to fit snugly through said bearings, the inner margins of said jaws being widened and presenting toothed bearing faces to the pipe to be held, and abutments at the outer margins of the jaws which limit the inward movement of said jaws.

7. In aslip for holding pipe and the like a carrier section, arcuate in horizontal cross sectional contour, and having radial, verticallyextending slots, forming jaw bearings, jaws working throughsaid bearings whose inner margins are widened and formed with toothed, pipe-engaging faces, and external abut-ments at the outer margins of said jaws whichlimit the inner movement of the jaws relative to the carrier. 7

8. In a slip a carrier section, pipe engaging jaws therein, the upper end of said section having spaced bearings, a handle whose ends fit into said bearings, said section having in- .wardly extending keyways transversely of said bearings, pins in said keyways extending through said handle ends, and abutments welded to the walls of the keyways adj acentthe outer ends of said pins.

In testimony whereof I have signed my name to this'specification. v

JEDDY D; NIXON.

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