US1170843A - Casing-jack. - Google Patents

Description

I H. G. PEAKE.

CASING JACK. APPLICATION IHLED JUNE 7,1915.

Patentd Feb. 1916.

I INVENTOR Early gfeafl;

WITNESSES:

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HARRY G. PEAKE, OF SAN FRANCISCO, CALIFORNIA.

' CASING-JACK.

able clutch or gripping member adapted'to'" embrace the pipe or casing to be removed.

Another object of the invention is to provide a toggle lever mechanism, whereby the movable gripping member is operated, and to provide means for automatically and successively engaging and releasing the gripping members while the pipe or casing is being lifted. I

Further objects will hereinafter more fully appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure 1 is a side elevation of the casing jack. Fig. 2 is a cross section on line 22 of Fig, 1.

The jack proper consists of a stationary base member A in which is formed a central opening 2. Pivotally mounted, as at 3, is

one member 4 of a toggle link, and formed integrally with said member is a lever 5. Pivotally attached, as at 6, to the link member 4 is a second link 7, the upper end of which is pivotally attached to a movable collar8in which is formed a central opening 9. Two or more levers 5, with connected toggle links 4 and 7, may be interposed between the stationary base section A. and the movable collar 8 and these levers may be operated by any suitable means, or, as here shown, by a bridle connection 9 which may be raised or lowered by the cable 10 and any suitable mechanism not here shown.

Loosely mounted in guide slots, formed around the central opening .2 in the lower base section, is a plurality of wedge-shaped gripping members 12, and similarly mounted in the upper collar 8 is a plurality of wedgeshaped gripping members 13.

In operation, when it is desired to remove a pipe or casing, such as indicated at 14,

I Specification of Letters Patent. Application filed June 7, 1915. "Serial No. 32,611.

Patented Feb. 8, 1916.

from a well, itfis only necessary to slip the ack over the upper. end of the casing, as indicated inFig. 1, and support'same on a pair of timbers as shown in Fig. 1 or like means. The levers 5 are then raised and lowered by means of the bridle 9 and cable 10 and .an upward movement of the levers will force the toggle links inwardly against the casing14, causing the collar 8 to be movedin an upward direction. The wedges 13 will in this manner grip the pipe and causethe latter to beraisedin unison with the collar 8; the lower wedges 12 being inactive during the upward movement of the collar 8. The moment the levers 5 are lowered the collar 8 will also be lowered, together with the gripping. wedges 13. The lower wedges 12 will then be forced into engagement with the casing, if this has a tendency to settle, and thus rip and lock it from dropping or settling own.

A jack constructed ashere shown has the advantage of pulling/the casing from the ground more rapidly than the ordinary method. It, furthermore, prevents any injury to the threads and. couplings on the casing. The usual method of pulling a casing is with the pulling jar, which is virtually a hammer striking an upward blow on the inside of a cap which is screwed on the top length of a casing. This constant ham-f mering has a tendency to crystallize the metal in the pipe, and it is not an uncommon occurrence to have the thread portion break off. The device here shown entirely eliminates this feature as the'pull is constant. The jack also eliminates any possibility of the pipe slipping back into the hole, as the wedges in the lower member A prevent this;

7 s'rrs PATENT Enronconsequently any gain made in pulling the Y pipe is retained. This isiof great assistance when the pipehas been driven through clay. This material being more or less springy, the pipe may easily be brought up, say, onequarter of an inch by a blow from the pulling jar, but before another blow is struck, it settles back into its original position.

The jack is simple and substantial in construction and, easy to. operate and can be readily moved about from place to place when needed. 1

The materials and finish of the several 1 I wish it understood that various changes in form, proportions and details of construction may be restorted to within the scope of the appended claims, and'that I do not wish to limit myself to the specific design and construction here shown.

Having thus described my invention, what I claim and 'desirelto secure by Letters Patent is 1. In a jack, a base and a top member spaced above the base and each apertured to receive a pipe, a pair of toggle links comprising short parts pivoted to the base at their lower ends and angular lever extending out from said short parts, and vertical links pivoted at the lower ends to the upper ends of the short parts and to the top member and normally diverging at their lower ends whereby upon upward movement of the levers the vertical links will be moved inwardly at their lower ends 'to thus move the top member upwardly.

2. In a pipe jack, an upper movable member and a lower statlonary member, a pair of means to ralse the upper member located on opposite sides of the members and connected thereto, actuating means for each of witnesses.

HARRY G. PEAKE. Witnesses:

R. H. BLACK,

J. C. LUTGEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, IMO."

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