USRE5386E - Improvement in grab-tools for oil-wells - Google Patents

Description

UNITED STATES *PATENT OFFICE.

JAMES H.LUTHER, OF PETROLEUM CENTRE, PENNSYLVANIA.

IMPRovl-:MENT IN GRAB-TOOLS FOR olL-wELLs. l'

Specification forming part of Letters Patent No. 56,961, dated August 7, 1866; reissueNo. 5,386, dated, April 29, 1873; application filed January 14, 1873.v

,Pennsylvania have invented a new and Improved Grab; and do hereby declare the following to be a full and correct description of the same, reference being had to the accompanying drawing, in which- Figure l is a central vertical section of the same. Fig. 2 is a transverse section taken in the plane of the line m. Similar letters of reference indicate like parts. v

In the drilling of oil, Artcsian, and other deep wells, the drilling-tool often becomes fast in the well or'bore, thus rendering it necessary to abandon the well, even when nearly completed. To produce an implement by which the tool, when it has become fast in the well or bore, can be withdrawn from the same is the object of the present invention,

'and by it a tool, or grab, as I term it, is

produced with which the desired object can be effected, its peculiar construction also enabling it to be detached from the drill-tool in the well, if found so xed as to render it impossible to withdraw it without further loosening, by a spear, or in any other suitable manner, thus avoiding the still further clogging of the Well'or bore by the addition of broken particles of the grab.

A in the drawing represents a hollow Wrought-iron cylinder or tube, with seats a formed upon its inside, and extending in the directionof its length, which seats, at the lowervend of the tube, are milled entirely through its thickness, with bevel or inclined faces b. i, B are the grabs, fitted to the faces b of the tube A, ,which grabs, by thin metallic strips or bands c, are connected to a common loose collar or ring, D, upon the outside or stems of the tube A, near its upper end, and

rest-ing upon projecting pins c of the salue. Between this collar D and the shoulder E of the tube A a spiral spring, F, is coiled or Wound, by means of which spring the collar is heldto its seat upon the pins c, and brought down upon the same, when by any suitable means it is raised or moved upward upon the tube. The inner faces ofthe grabs B are scrrated or toothed to prevent them from slipping when set ,upon the tool which they are toremove. rIhe stem of the tube, above its shoulder E, is provided with a screw-thread, d, for screwing or fastening the grab to a rod or other suitable device to enable it to be low; ered into the Well or bore or tube from which a tool that is fast is to be removed.

, In the use of the grab constructed as above explained and shown in the drawing, it is first screwed to one end of a rod of suitable length, whether made in sections or of one continuous piece or length, and by such rod lowered into the well, (the distance between th'e grab-jaws then being less than the size of thepiece or tool which is fast in the we1l,) when, assoon as the tube A has reached the said piece or tool that is to be extracted, ,it is driven down over the same in any proper manner, thus forcing the grab-jaws up and outward through their seat# openings a a of the said tube until the said tube has been driven down as far as is 4considered necessary; it is then drawn up, its grabjawstight ly pinching and holding the said tool, when, it' satisfied such tool cannot thus be stirred,

the grab is then to be detached and with drawn from the well, and the said tool then speared, as it is termed, and by that means 4loosened in its seat in the well or bore, when the grab vis again applied to it, as before; and'so on until finally removed, the grab being detached from the tool in the4 well or bore by means of a hook, shown at H in the drawing; that, being lowered into the same and hooked on the under side or edge of the loose collar, enables such collar to be raised, sufficiently to withdraw or free the grab-jaws from the drill-tool, as is obvious without any further explanation.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In. a. tool for extracting articles from oily wells, the wedge-shaped grab, in combination with and operated by an inclinedfseat, in the manner described.

2. The combination of the grabs B, the

`Strips c c, and ringD, constructed and 'operating as described. l

3. The combination of the wedge-shaped grabs B, havin g inclined and rounded backs, as shown, with the inclined and rounded seats a a, milled or turned in or through the sides of the cylinder b, as specified and shown.

The above specification of my said invention signed and witnessed at Petroleum Centre this 31st day of December, A. D. 1872. JAMES H. LUTHER.4

Witnesses: t v

SAM. RAYNoLDs, EDWARD TARE.

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