USRE3605E - Improvement in clamps for elevating well-tubes - Google Patents

Description

, UNITED STATES PATENT OFFICE.

DANIEL FISHER, oF oIL "CITY, PENNSYLVANIA.

IMPROVEMENT IN cLAMPsFoR ELEVATING WELL-TUBES. i

Specification forming part of Letters Patent No. 87,097, dated February 23, 1869,; Reissue N0. 3,605,1ated August 17,1869.

` To all whom-it 'may concern.' v

' ings, whichare made a part of this specification.

The subject ofmy invention is a novel and simple device for facilitating the construction of tube-wells, combining the separate functions of the elamp"7 and (lrawer.77

It consists of a hinged clamp adapted to grasp the tube under its thimble or sleeve, and having attached to it a pair of links for its attachment to the rope of the elevating'or lowering apparatus, said links, when in the posil tion in which they are held by their attachment to said suspendingfrope, also serving to lock the clamp in its closed condition. One of the 'links is provided with a set-screw, by which it is adapted to be held in its upright position when detached from therope, in order to maintain the clamp in its closed condition while coupling and uucoupliug iubes.

In the drawings, Figure 1 is a perspective view of the device in an open and detached condition. Fig. 2 is an elevation thereof, partly in section, illustrating the manner of applying it to the tubing.

A A may represent the two jaws which constitute the clamp, and which may be made of malleable iron or other suitable material, of substantially the form represented in Fig. l, und hereinafter more particularly referred to.

B B' are the suspending-links, which are preferably of curved form to enable them to meet over the end of the tubing, as represented in Fig. 2, where the tubing is shown in red. They may be made ot' wrought-iron in the usual manner. They are connected to the clamp by means ot' the holes a a' in the lower edge of the jaw A, and when in their elevated position embrace the sides of both jaws and hold them tightly in theirclosed position, thus forming a strong, simple, and very secure fastening.

A set-screw, C, passing through an enlargement b of the link B, adapts said link to be held in an elevated position, so as to lock the clamp when it is detached from the rope, as in coupling and uncoupling the tubes.

rlhe jaws A A' are each made with a semitubular portion, ai, to enable them conjointly.

to encircle the tube, and with handles 11.*', by which to hold the tube from turning while another is being screwed on. The upper edge, a, of the portion a* is made straight or horizontal, to form a suitable bearing for the collar of the tube, as represented. Its under side, 0,*3, may be concave, as represented,or

have any other desiredform. The jaws are hinged preferably only at their upper part, as represented, the hinge being composed of the perforated lugs a. a, cast on the jaws A and A', respectively, and united by a tap-bolt, D, provided with the customary angular head d, andtaking into a correspondingly-threaded socket in the lug a of the jaw A, the object being to form a secure and tight hinge with out extending the pintle entirely through the hinge. Thejaw A' is recessed at aa and a4 for the reception of the link B and the boss a5 of A.

E- represents the rope of the elevating or lowering apparatus, and F- the customary swivel-hook attached thereto.

G represents the tube, and H the thimble or sleeve screwed on the end of the tube G to form the coupling.

The operation ot' the device is as follows:

Two clamps, such as described, being used, as with the ordinary screw swivel drawer, a length o f tubing being attached, as represented in Fig. 2, its end is inserted in the hole and it is lowered until the clamp rests on the blocks at the surface of the ground. The hook F. is then removed from the links of this clamp, and the second one, with another length of tubing, is attached and elevated, and its lower end is screwed into the thimbleH of the rst.

An operator meanwhile grasps the handle ai" 2 vneen ing the operation is substantially similar, and requires nc'fnrtber description.

The precise form of parte and combination of features shown and described is not essential to the operation of the individual parte, and may be modified as found preferable in practice. For example, the jaws engaging nnder the tube-thimble may be used without the clamping-screw C, and with' any proper form and arrangement of the suspending-links.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1. A tubing-drawer with jaws adapted to catch under a. collar or thimble on the welltube, all substantially as sei: forth.

DANinL FISHER.'

Witnesses z l JonN UUMMING, ALEXANDER CUMMING.

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