US1776737A - Automatic release spear - Google Patents

Description

I Patented Sept. 23, 1930 i M i I I. p WInLinri JLnILLER, F S-ULIYHUR, IJQUIQSFIAJVNA v I i uroMA'rIc REIQEASJEVSVPEAR l l Application filedJ'uly 25, 1929; Serial no, 381,033,

This invention relates to automaticrelease spears and it is an object of the invention to provide a deviceof this kind wherein the slip sleeve is in two parts so that the portion of the sleeve carrying the gripping arms may be readily removed for replacement as the occasions of practlce may necessitate.

Another object ofthe invention is to provide a device of this kind wherein the desired relative rotation between the shank and the slip sleeve is accomplished in substantially an automatic manner to. effect the desired locking engagement between the sleeve and shank when it is desired to lift the tool.

The invention consists in the details of con- 'struction and in the combination and arrangement of the several parts of my 1mproved automatic release spear whereby cer- 7 2otain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth. a

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the bet ter understood, I will now proceed to describe thesame with reference to the accomso panying drawing, wherein Figure 1 is a view partly in section and partly in elevation illustrating a spear constructed in accordance with an embodiment of my invention, the associated casing being fragmentarily shown in section; V

Figure 2 is an enlarged sectional view taken substantially on the line 2-2 of Figure 1;

Figure 3 is a sectional view taken substantially on the line 3-3 of Figure 2.

3 As disclosed in the accompanying drawing, 1 denotes the lower portion of a drill stem which has threaded therein the upper portion of an elongated tubular shank 2. The lower portion of the shank 2 has threaded or 4:5 otherwise engaged therewith a desired tool 3, herein disclosed as constituting a guide member or reamer. The upper or inner portion of the guide member or reamer 3 is tapered as at l, for coaction with the internally tapered extended portion of the packer *P N FF C 5. This packer 5 is of cylindrical typeand is formed of rubber or kindred material and has its upper portion secured around the cylindrical extension 6at the lower portion of the tapered mandrel 7 The extension 6 of the mandrel 7 results in an annular-shoulder 8 contacting with the upper edge of the packer 5 so that as pressure is imposed from above upon the packer 5 the same willhave requisite expansion to assure effective contact with the inner wall of the casing C. The

mandrel 7 is freelymounted' on the shank 2 and is capable of rotation therearound.

- Surrounding the lower portion of the shank 2 is anelongated slip sleeveS, and" as herein embodied said sleeve comprises'two sections 9 and 10, the adjacent end portions of said sections" 9and10 are in threaded en 'gagement-onewith the other so that" when desired the same may be readilyuseparated; This separation is of particular i-adva-ntage in removing the lower section 10 which carries the elongated gripping arms 11 so that the same can bereadily replaced after becoming unduly worn or otherwiseunfit for eiiective use. This lower section 10 can be conveniently removed after taking oif the guide member or reamer 3, the packer 5 and the mandrel 7. l i

The upper section 9 of the slip sleeve S at diametrically opposed points is provided with an elongated slot 12, the lowerportion of which being transversely enlarged as at 14, to provide an upper shoulder 15. The lower edge wall-of the enlargedportionfla of the slot 12 remote from the shoulder 15 is disposed downwardly on an incline, as at 16, toward the opposed edge wall. Tightly engaged through theshank2 is a key 17 of desired dimensions and ofa length to project 7 beyond opposite sides of the shank 2 andto be received within the slot 12 and its enlarged portion 14. It is to be noted that the bore of the shank 2 adjacent to the key 171s enlarged, as at 18, to allow water; passage around the applied key 17. I V ,The inclined edge walls 16 of the slot 12 are'for the purpose of automatically placing the extended: portion of the key 17 directly under the shoulder 15 when the shank 2is lowered to allow the shoulder 19 to jar the mandrel from the gripping arms 11. The shoulder 19 surrounds the shank 2 at a desired point thereon below the key 17 as is clearly illustrated in Figure l of the accompanying drawing. This shoulder 19, as here in embodied, is provided by reducingin diam eter the lower portion of the shank 2.

In the present embodiment of my invention, it is to be stated that the spear is at all times automatically in release position until the operator desires to set for pulling whereupon the drill stem 1 is turned a slight distance in the right direction which will place the key 17 in the upper or pulling portion of the slot 12 as illustrated in Figure 1. By having the key .so positioned should the drill stem break and the lower portion drop, the spear will be set in release, thus only necesgoi sitating catching the top of the broken drill to remove the drill and spear from the hole. From the foregoing description it is thought to be obvious that an automatic re-- lease spear constructed in accordance with 5 my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modificasoi; tion without departing from not wish tobe understood as limiting myself to the precise arrangement and formationof the several parts herein shown in carrying out my invention in practice except as hereinafter claimed. I

, I claim v 1. An automatic release spear comprising an elongated shank, a tapered mandrel carried by and surrounding the lower portion of the shank, a slip sleeve surrounding the shank and having its lower end portion provided with gripping arms, the tapered mandrel engaging said gripping arms from with- 53' in, the slip sleeve having a slot disposed along the upper'portion thereof, said slot having its lower portion transversely enlarged in one direction, the lower portion of the edge wall of the slot opposed to the eno3larged portion being inclined inwardly of by and extending the slot, and a part carried outwardly from the shank and working-within the slot of the sleeve. 1

2. An automatic release spear comprising an elongated shank, a mandrel carried by and surrounding a portion of the shank, a slip sleeve surrounding the shank and provided with .gripping arms, the mandrel engaging said gripping arms from within, said slip 6(i sleeve having a slot disposed therealong with a portion transversely enlarged in one direction, the edgewall of the slot opposed to the enlarged portion being inclined inwardly and coact'lng means carried the principles and spirit thereof and :for this reason I do shank and provided with expansible pipe engaging means,means carried by the shank for expanding said means upon pull on the shank,

y the shank and sleeve for automatically rotating the same one with relation to the other to effect a release of the sleeve and shank.

In testimony whereof I hereunto aflix my signature.

WILLIAM J. MILLER.

of the slot, and a part carried by theshank fliand working within the slot of the sleeve.

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