US788738A - Oil-well tube-clamp. - Google Patents

Description

No. 788,738. PATENTED MAY 2, 1905.

- W. M. THOMAS.

OIL WELL TUBE CLAMP.

APPLICIATION FILED-SEPT. 27, 1904.

Wtnes'ses "v Inventor Httomegs ppp *114.1128

Patented May 2, 1905.

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OHL-WELL TUBE-CLAMP..

SPECIFICATION forming part of Letters Patent No 788,738, dated May 2, 1905. Application filed September 27, 1904. Serial No. 226,197.

To nti/Z whom it may coz/tecra.-

Be it known that I, I/VARREN M. THOMAS, a citizen of the United States, residing' at North English, in the county of Iowa and State of Iowa, have invented a new and useful Oil-Well Tube-Clamp, of which the following' is a speciiication.

This invention relates to devices employed for raising or lowering well-tubing, pumprods, and for similar purposes, and has for its .object to produce a simply-constructed, eHicient, and durable device of the character specified and which may be readily adjusted to pipes or rods of different sizes.

Vith these and other objects in view, which will appear as the nature of the invention is better understood, the same consists in certain novel features of construction, as hereinafter fully describedand claimed.

In the accompanying drawings, forming a part of this specification, and in which corresponding parts are denoted by like designating characters, is illustrated the preferred form of embodiment of lthe invention capable of carrying' the same into practical operation, it being' understood that the invention is not necessarily limited thereto, as various changes in the shape, proportions, and general assemblage of the parts may be resorted to without departing from the principle of the invention or sacrificing any of its advantages.

In the accompanying drawings, Figure 1 is a perspective view of the improved device applied. Fig. 2 is a side elevation of the upper gripping member upon a section of tubing.

In the improved-device is comprised a base member for supporting over the well the tube or rod to be withdrawn or to be lowered and having a supporting-standard rising' therefrom, two grip members spaced apart, one operative by a lever carried by the standard for raising or lowering the tube or rod, as the case may be, and the other gripping member for holding' the tube or rod while the operating-grip is being adjusted for a fresh purchase.

The base consists of spaced side members 10v 12 for resting on the well-tubing (indicated at 11) and connected by a transverse brace 39 and melosmg the pipe to be drawn, a portion of which is represented at 13. The supporting-standard is formedof two spaced members 40 41, pivoted at their lower ends, as at 42 43, to the base members 10 12 and supremoving one of the bolts 44 or 45, as will be obvious. A

The upper gripping member is designated as a whole by 17 and the lower member as a whole by 18, and as they are precisely alike in construction similar designating' characters are employed for like parts in each.

The grip members consist of plates 19 20, curved to lit the tube or rod and with spaced ears 21 22 extending rearwardly therefrom and provided with transverse apertures.

The clamp or grip members are connected upon opposite sides of the tube or rod by radius-bars 23 24, the latter pivotally united, as at 25, at their inner ends and likewise pivotally united to the ears 21 22 by bolts 26 27, passing tlu'ough the apertures therein. The radius-bars are provided with a plurality of apertures, as at 28 29, to provide for the ad- `justment of the grip members to [it differentsized tubes or rods. The radius-bars of the upper grip member are connected centrally by the pins 25 to links 30 31, which are in turn pi voted to the shorter forked end 33 34 of the operating-lever 15. The radius-bars of the lower grip member are pivoted centrally by their pin 25 to the standard members 40 41, the plates 19 2O of the lower grip member being further provided with a releasing-lever 35, pivoted at 36 to the standard member' 41 and connected to the grip member by links 37 38.A By this arrangement it will be obvious that when a pipe or rod is to be lifted a downward force on the lever 15 will elevate the upper grip member and cause it at the same time to firmly grip the pipe or rod and carry it upward, the upward movement of the pipe or rod at the same time releasing the lower grip member, because the pivot-pins 25 of its radius-bars are connected to the stationarystandard member 41. lNhen the limit of the downward movement of the lever 15 is reached and the latter starts on its return movement, the upper clamp member is instantly released and slides downward for a new grip, the weight of the pipe or rod causing the reversal of the action of the lower clamp member, which firmly grips the pipe or rod and holds it stationary until the upper clamp member again engages the same, and so on as long as required, the clamp members thus acting automatically while lifting the pipes or rods.

When pipes or rods are to be lowered, the upper clamp member is engaged with the pipe or rod as high as the range of the lever will permit, and when the weight of the tube comes on the upper grip member the tube can be lowered by moving the lever 15 upward.

'In the meantime the smaller lever 35 will have been depressed to raise the plates ot' the lower clamp member to release them from the pipe or rod until it has been lowered the length of the stroke of the lever 15. The lever 35 is then released, which permits the lower clamping member to instantly grip the tube or rod and hold it from further descent until the upper clamp member can be adjusted to a new position, and so on as long as required.'

The inner surfaces of the plates 19 20 will preferably be roughened to increase their holding force.

Having thus described the invention, what is claimed is# 1. In a pipe-jack, reversely-disposed gripping-jaws formed with outwardly-extending spaced ears having transverse apertures, radius-bars pivotally united at one end upon opposite sides of said jaws and likewise pivotally connected to said jaw members by bolts passing through said bars and the apertures in said ears, links connected to said radius-bars at their united ends, and an operating-lever connected to said links.

2. In a pipe-jack, reversely-disposed gripping-jaws formed with outwardly-extending spaced ears having transverse apertures, radius-bars pivotally united at one end upon opposite sides of said jaws and provided with a plurality of spaced apertures for adjustable connection to said jaw members by bolts passing through said bar perforations and the apertures in said ears, links connected to said radius-bars at their united ends, and an operating-lever connected to said links.

3. In a pump-jack, a base formed of spaced side members, a standard formed of spaced bars pivoted by one end to said base members and having an operating-lever pivoted to the other ends, a brace pivoted respectively by its ends to said base members and standard members, two sets of reversely-disposed gripping-jaws spaced apart for bearing upon opposite sides of a pipe or rod, radiusbars for each pair of said gripping-jaws and united respectively at their inner ends and likewise pivotally united to their respective jaw members, one set of said radius-bars pivoted to said standard members and provided with a releasing-lever, and the other set of said radius-bars connected to said operatinglever.

In testimony that I claim the foregoing as my own I have hereto axed my signature in the presence of two witnesses.

- WARREN M. THOMAS.

I/Vitnesses:

F. E. HUMPHREYS, F. F. HoUsToN.

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