US1528160A - Slip - Google Patents

Description

- I H. sfMcGARRY Mar. 3. 1,92s.

SLIP

med. Feb. za, 1924 Patented Mar. 3, 1925.

UNITEDr STATES HENRY s. ivrGAaRY, or HoUs'roN, TEXAs.

SLIP.

Application filed. Februaiy 28, 1.92 4.v Serial No. 695,833.

To all whom it may concern! Be it known that I, HENRY S. MCGARRY, a citizen of the United States, residing at Houston, in thecounty of Harris and State of Texas, have invented certain new and useful Improvements in a Slip, of' which the following is a specification.

' This'invention relates to new and useful improvements ina slip.

One object of the invention is to provide a slip of the character described specially designed to be inserted in a rotary table,

. around the pipe and provided for the purpose of holding the pipe suspended in the rotary while making up, or breaking up, the string of pipe.

Another object is to provide a. rot-ary slip, formed of independent sections, each section being composed of a plurality of ja-Ws anchored together in such manner as to per; mit the jaws of each section to move radially, as well as vertically,fi1'elative to each other so that the slip Will engage With round pipe or with pipe of irregular cross sectional contour, all the Way around, and thus securely grip and hold the same Vsuspended from the rotary. p

Another object of the invenion is to provide a slip, of the character described which is of very simple construction, and which may, therefore, be very cheaply produced, and which is very effective in use.

Tith the above and other objects in view, this invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 shows a plan view of one section of the slip.

Figure 2 shows an inside elevation thereof; Figure 3 shows a side view thereof taken at right angles to the view shown in Figure 2, and, Figure 4:v is across sectional view taken on the line 1-43of Figure 2.

In the dra-wings the numerals 1 and 2, respectively, designate the upper. and lower 7arcuate end plates of the slip sections.

These end plates have their facing sides provided with dovetailed grooves 3 and 4, respectively. The numeral 5 designates the jaws. The inner sides of the jaws are toothed, to engage With the pipe, and their outer sidesV are downwardly Vtaper-ed, as

shown. The lupper and lower ends of the Jaws 5 are provided' with the dovetailed i tenons 6 and 7 which are fitted loosely into vfth'e corresponding grooves 3 and 11. As shown, each section `of the slip has four jaws, and the end .jaws are keyed to the respective upper and lower plates 1 and 2' by means Vof the transverse keys 8 and 9, which fit loosely through keyways, provided for them, in the tenons 6 and 7.

The top plate 1, of each section, 'is provided with the outwardly beveled, spaced lugs 10, 10, between which the rod 11 is pivoted. This is accomplished by means of a pin 13 whose ends are journaled in the respective lugs, and on Which the rod 11 has a bearing. The .outer end of this rod is formed into a grip 12, thus forming a handle, by means of Which the slip section may be handled. vWhen the slip is in position for use, the handle lies back in horizontal position, and the lugs 10 protect it from being broken by the falling of heavy objects, such as are in common use on a derrick floor in c'arrying on drilling operations.

VVhat I clam is:l

1. A slip formed of independent sections, eachsection being'composed of an upper and a lowerl arcuate end plate, a plurality of jaws between said plates. dovetailed end tenons on said jaws, said plates being provided with dovetailed grooves into which the corresponding tenons fit.

2. A slip formed of a plurality vof sections, each section being composed of a plurality of jaws and arcuate upper and lower end plates, the respective plates abutting vagainst the corresponding ends of the jaws and being loosely connected to said aws by means vof dovetailed tenons formed on one of said abutting parts which work in dovetailed grooves in the other abutting parts.

3. A slip formed of a plurality of sections, each section being composed of a plurality of jaws, and arcuate upper and lower end .plates with 'which the corresponding jaws .articulate, said articulating parts being' formed, one with `a dovetailed tenon and the other with al dovetailed mortise in which the tenon fits loosely.

el. A slip formed of a plurality of sections, each section being composed of a plurality of ja'ws, and arcuate upper'and lower end plates with which the corresp-ondingjaws articulate, said articulating parts beingl formed, one with a dovetailed tenon and the other With a dovetailed mortise in which the tenon fits loosely, and a handle earri'ed by each section.

5. A slip forined of a pluralty of seotions, each section being oolnposed of a plurality of jaws and arcuate upper and lower end plates, dovetailed end tenons on said jaws, said plates beingl provided With dovetailed gl'ooves into Which the oorresponding tenons fit, and means seem-ing the jaws against detaohment from said end plates.

6. A shp f'onned of a pluraltyof sections, each section being' oolnposed of a p1nraity of j'aws` an arcuate upper end plate abutting against the corresponding' ends of the jaws of each section and being looseiy connected to said jaws by means of dovetailed tenons forlned on one of said abutting parts Which Work in dovetailed grooves in the other abutting part and means for holding` the lowelI ends of the jaws of each section in substantially arcuate alignment.

In testiinony Whereof I have signed my name to this specifioation in the presence of two subscribng; Witnesses.

HENRY S. MoGAR-RY. ftnesses T. BANKWIGHT, H. IH. LEE.

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