Untitled record

Application filed June 18, 1886. Serial No. 205,555. (No model.)

To all whom it may concern:

Be it known that I, John Holly, a citizen of the United States of America, residing at Rouseville, in the county of A^renango and State 5 of Pennsylvania, have in vented certain new and useful Improvements in Tube-Clamps for OilWells, of which the following is a specification, reference being had therein to theaccompanying drawings.

io My invention relates to an improvement in attachments for oil-wells, and has for its objects to providemeans for automatically preventingrhe tubing used for extracting the oil from the well from the slipping and dropping into the well while being coupled or drawn out, incident to the methods ordinarily in use, and to provide means whereby this may be effected automatically with varying sizes of pipe. I accomplish these objects by means of the at20 tachment illustrated in the accompanyingdrawings, in which—

Figure 1 is apian view of the attachment in working order. Fig. 2 is a plan view of the same with the cover removed. Fig-. 3 is a lon25 gitudinal section of the attachment as shown in Fig. 1.

My attachment consists of a circular iron casing, A, which has a perforation in the bottom for the passage of the tubing leading into the _ύο well. In this casing are hollow iron boxesBB, segmental in shape and rigidly secured to the bottom of the casing A,leaving a space between them and the casing A, in which is placed a solid iron collar, C, and spaces between each, 35 parallel with the diameter for the reception of the clutches I). The clutches Dare elongated, having a toothed end rounded to fit the tubing, and curved on its longer diameter, and a rear end curved to correspond to the toothed end. 40 Under these clutches are placed the springs E, which are secured to the bottom of the casing A, and spring so as to hold the clutches poised at an angle. To the rear of these clutches and iron boxes B B is the collar C, moving freely 45 against the casing Λ, and provided on the inner surface with cams O', corresponding in number to the clutches. These cams are slightly inclined, being larger at the bottom than at the top. Projecting through a slot made in 50 the casing A for that purpose is a bracket, F, carrying the pin G, which projects above the top of the casing A. Engaging the top of this pin G is a rod, II, which is connected to the spring I. The spring I is circular, extending around the top of the casing A, and is rigidly 55 secured to the top a' ot the casing A. This top a' is held in place by bolts passing down through the boxes-B B aud the bottom of the casing A, and is flush with the top of the casing A. Upon the bracket F is another pin, K, 60 extending outward and provided with a handle. This pin is engaged by a spring-pawl,L, which is rigidly secured to casing A, and. is provided with the foot - rest M, extending down near the ground, for convenient mauipu- 65 lation by the operator.

The operation of my attachment only occurs when the tubing is either being drawn out of the well or being coupled, or iu case of accident. AVhen the tubing is being let down into 70 the well, the operator, by means of the handle on the pin K, draws the collar C around and the cams C' 0' out of engagement with the clutches D, and allows them to fall back out of engagement with the tubing,and the tubing 75 to pass. Now, in case of an accident at the paying-out drum or the discovery of a flaw, the operator places his foot upon the foot-rest M and releases the pin K from the pawl L, when the spring I throws the collar C around So and the cams C' into engagement with the clutches I) D, and presses the clutches upon the tubing. As the clutches D engage, they roll upon their rounded rear end, and because of the incline of the camas they roll over they 85 approach each other and fasten the tighter as the strain is greater. The shock is broken by the springs E E.

I do not confine myself to the exact construction herein set forth. 9^C