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  1. Erweiterte Patentsuche
VeröffentlichungsnummerUS803450 A
Veröffentlichungsdatum31. Okt. 1905
Eingetragen3. Mai 1905
Prioritätsdatum3. Mai 1905
VeröffentlichungsnummerUS 803450 A, US 803450A, US-A-803450, US803450 A, US803450A
ErfinderJohn Stegner
Ursprünglich BevollmächtigterJohn Stegner
Zitat exportierenBiBTeX, EndNote, RefMan
Externe Links: USPTO, USPTO-Zuordnung, Espacenet
US 803450 A
Zusammenfassung  auf verfügbar
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Beschreibung  (OCR-Text kann Fehler enthalten)

PATENTED OCT. 31, 1905.



MAY 3. 1905.

Q/vitneowa No. 803,450. PATENTED OCT. 31. 1905.





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CASING-SPEAR- Specification of Letters Patent.

Patented Oct. 31, 1905.-

Application filed May 3, 1905. Serial No- 258,707.

To all whom it may concern:

Be it known that I, JOHN STEGNER, a citizen of the United States, residing at Lewisville, in the county of Monroe, State of Ohio, have invented certain new and useful Improvements in Casing-Spears; and I do hereby declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to grips, and more particularly to those designed for use in removing loose casings from deep wells, and has for its object to provide a grip of this kind which may be operated by fluid-pressure to securely engage a casing.

Another object is to provide a grip which will be simple in arrangement and which may be manufactured at a low figure.

Other objects and advantages will be apparent from the following description, and it will be understood that changes in the specific construction shown and described may be made within the scope of the claims, and that any suitable materials may be used without departing from the spirit of the invention.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure 1 is a side elevation of the present grip. Fig. 2 is a longitudinal section of Fig. 1. Fig. 3 is a view similar to Fig. 2, showing the grip engaged at its upper end with a casing and having its gripping members engaged within a second casing, the latter being shown in section. Fig. 4 is a section on line 4: 1 of Fig. 1 looking toward the gripping members.

Referring now to the drawings, the present invention comprises a vertically-extending cylinder 5, which is exteriorly threaded at its upper end, as shown at 6, for engagement in the lower end of a section of casing 7, as shown. The lower end of the cylinder is closed by a plate 7, having a central circular opening 8 therein, in which there is engaged the upper end of an upwardly-tapered stem 9, enlarged into a head 10 at its lower end.

Slidably disposed within the cylinder 5 there is a piston 11, which has engaged therein the upper ends of a plurality of rods 12, which extend downwardly through perforations 13 in the plate 7 and which are arranged in a series surrounding the stem 9. A helical spring 14 is disposed within the cylinder between the piston 11 and the plate 7 and holds the piston yieldably at the upward limit of its movement.

A plurality of gripping members 15 are provided, having upwardly-extending stems 16,

l which are pivoted between spaced cars 17,

carried by the stem 9 adjacent to its lower end, and the outer faces of these members 15 are transversely convex and are provided with transverse upwardly-directed teeth 18. The lower ends of the rods 12 are pivoted to the stems 16 in such a way that when the rods are moved downwardly, as will be presently described, the stems 16 will be moved inwardly toward the stem 9 and the gripping members 15 will be moved to extend outwardly from the stem 9.

Engaged with the stem 9 there is a split spring-ring 19, which lies within the inclosure of the stems 16 and rests against the inner faces thereof, the action of this spring-ring being to hold the members 15 yieldably against the stem 9, as will be readily understood.

In use the upper end of the cylinder 5 is engaged with the lower end of a casing, and the instrument and casing are then introduced into a well from which a loose section of casing is to be withdrawn, the lower portion of the instrument and the gripping members being introduced into the upper end of the loose casing. The downwardly-extending head 10 of the instrument protects the gripping members 15, which might otherwise come into engagement with the bottom of the well or with obstructions in the loose casing. After the instrument has been thus disposed water or other fluid is directed into the casing 7 and the pressure of this fluid upon the piston 11 moves this piston downwardly, this operation rocking the stems 16 upon their pivots with their upper portion moving inwardly and bringing the teeth of the members 15 into engagement with the inner face of the loose casing. The fluid Within the casing 7 as will be understood, is under suflicient pressure to cause the members 15 to tightly engage the casing in order that they may not slip therefrom. It will be understood that the movement of the stems .16, as just described, is against the action of the spring 14: and that when the pressure within the casing 7 is removed this spring Wlll return the gripping members to their original positions to release the loose casing, it being understood that this pressure is removed after the loose casing has been Withdrawn from the Well.

What is claimed is 1. A device of the class described comprising a stem arranged for introduction into a well-casing, gripping members carried by the stem and movable with respect thereto into and out of position to engage the inner surface of a casing Within which the stem lies, means for holding the members yieldably out of such position and means operable by fluidpressure for moving the gripping members against the action of the holding means.

2. A device of the class described comprising a stem adapted for engagement Within a well-casing, casing-engaging members carried by the stem and movable into and out of operative position, means for holding said members yieldably in inoperative position and means operable by fluid-pressure for moving the members against the action of the holding means.

In testimony whereof I aifix my signature in presence of two Witnesses.




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