Патент USA US2115166код для вставки
April 26, 1938. J. HOFFOSS CORE CATCHER Filed Jan._ 2, 1937 m / ,4, --L L “5 15.4. 2,115,166 2,115,166 Patented, Apr. 26, 1938 UNITED STATES PATENT OFFICE 2,115.1“ . 001m carcnun John Ho?oss, Houston, Tex., assignor to Reed Roller Bit Company, Houston, Tex., a coma ration of Texas Application January 2, 1937, Serial No. 118,724 6 Claims. ’ (Cl. 255-72) This invention relates in general to core drills for use in taking samples of the formation dur ing the drilling of a well or the like, and more particularly has reference to a device commonly 5 known as a core catcher, which device is located adjacent the lower end of the barrel for receiving the core, and is for the purpose of breaking the core off, and for holding the core and prevent ingit from dropping out through the bottom of 10 the core barrel during the time that the core bar rel is being drawn up to the top of the well. It is an object of this invention to provide a core catcher which shall be of simple construc ‘ tion and efficient in operation. 16 ' More speci?cally it is an object of this inven tion to provide a core catcher which will be less expensive to manufacture than previous core catchers, and which will be unfailing in its op eration. 20 - One other object of this invention is to provide a core catcher composed of .a relatively small number of component parts requiring the least possible amount of labor to produce and assem ble. 25 '. . One other object of this invention is to provide a core catcher which may be used for breaking and retaining a core from practically any type the core catcher taken along the line 4-—4 of ' The core barrel illustrated in Fig.1 is shown as being located within the lower end of the core barrel I and held in place therein by means of a shoulder in the lower portion of the core bit 2. The principal part of the core catcher illus trated comprises the body 3 which is formed with a 'plurality of slots therein extending from' its lower end upwardly as illustrated at 4. Within 10 these slots 4 there are disposed'core catcher ?n gers 5 and 6, these ?ngers being rotatively mounted upon a, ring 1 of circular cross section which surrounds the lower end portion of the body 3 and snapped into place in a groove formed in the exterior of this body member. - A second ring-like member 8 ‘of L-shaped cross section encloses the lower end of the body 3, and, is formed with slots extending from its upper edge downwardly corresponding in position to 20 the slots 4 within the body member 3 and so ar ranged as _to register with the slots 4. This mem ber is likewise formed with an internal groove adapted to receive the outer portion of the ring ‘I, and to retain this ring in position on the body 25 member 3. The ring 8 is‘ secured to the body member 3 by means of rivets 9 or the like. Within the upper end portion of the core catcher body, this body is made of slightly en Another object of this invention is to provide larged diameter for the purpose of receiving the 30 a core catcher which will be extremely durable spring‘member ill in the form of a ring which and require a minimum of repair and attention. exactly ?ts within the upper end portion'of the Another object is to. provide a core catcher body 3. This spring ring I0 is preferably se which when it requires repairs may be repaired cured in position by means of spot welding H, with the least possible expenditure of labor and of ‘formation. . or other suitable means. 35 material. - One other object is to provide a core catcher Extending downwardly from the spring ring l0 ‘ in registering relation with a portion of the slots which will present a smooth internal bore so as - 4 are spring ?ngers l2, and other spring ?ngers to permit the core to enter and pass freely there 13 extend downwardly in registering position with through. to the remainder. of the slots 4. The 40 40 Other objects and advantages ofthis invention respect spring fingers [2 are so arranged as to contact will become apparent from the following descrip rear surfaces of the core catcher elements 6 tion taken in connection with the accompanying. the and the spring ?ngers l3 likewise contact the rear drawing, wherein one embodiment of this inven surfaces of thecore catcher elements 5. These tion is illustrated. It is to be understood that spring ?ngers it will be seen are, therefore, in stration is not by way' 45 this embodiment and such position that they customarily urge the core . of limitation, but by w y of explanation and il- ' catcher elements 5 and 6 ‘toward the center of . > lustration, and that this invention is limitedin its scope only by the prior art, and by the terms of the appended claims. 50 In the drawing: ' ‘Fig. 1 is a, vertical cross sectional view illus trating a core catcher constructed in accordance with this invention, and showing its relation to' a 55 core bit when in use therein. Fig. 2 is a top plan. view of the core catcher il lustrated in Fig. 1. Fig. 3 is a horizontal cross section of the core 30 catcher only taken along the line 3-3 of Fig. l. Fig. 4 is a vertical cross section of one side of the path of the core as it moves upwardly into the core barrel. \ The core catcher elements 5 and 6 are prefer ably of the type employed for catching and re-_ taining cores cut from rock, shale, and other solid or substantially solid substances. Where it ' is proposed that the core catcher of this inven-' tion shall be usedfor soft formation cores, addi tional spring ?ngers “will be provided extend ing upwardly from the ring shaped spring mem ber it). These spring ?ngers will be curved to ward the center of the path of a core entering the core barrel, and will themselves serve as core so 2 9,115,166 catcher elements to assist in retaining cores of soft formation. It will be understood that the spring ?ngers Il may be omitted under certain circumstances. \ a core catcher has been provided which is ca pable of carrying out all the objects and advan tages sought by ‘this invention. ' - Having described my invention, I claim: It will be understood from'the foregoing that y 1. In a core catcher‘ assembly, a ring-shaped in the course of taking the core with a core drill body member having openings in the inner walls equipped with the core catcher described, the thereof, core catcher elements pivotally mounted core drill will be rotated in the ordinary manner within said openings to lie entirely therein when to cut the core, and the core after it is cut will' in their upper position, and swin'gable down 10 pass upwardly between the core catcher elements wardly and inwardly from such position, and.a 10 I and 6 moving them to the position illustrated .in Fig. 1 against the tension of the spring ?ngers single spring element having portions acting on said‘ core catcher elements, respectively, and urg J2‘ and i3. After the core passes upwardly it will ing them toward such downward and inward posi - also come in contact with the inner surface 101 tion. 16 the spring ?ngers II, and will press them out . I . . ' , ‘ 2. In a core catcher assembly,.a ring-like body-15 .wardly so that they will lie substantially ?at . part, core catcher elements mounted therein for against the inner wall ofthe core barrel and downward and inward swinging movement to reppermit the core to pass upwardly therein. when the core has reached the length desired, the cutting of the core will cease and the core barrel, including the core catcher, will, be moved upwardly. tain a core and a single spring element having a plurality of arms cooperating respectively with . said core catcher elements and urging said core 20 . catcher elements downwardly and inwardly. ' This will cause the core catcher elements 5, 6, and“ to swing inwardly and sepa - ' 3. In a core catcher assembly, a ring-like body member having slots formed therein, a second rate the core from the formation at its lower ring-like member extending about 1 said body end, and thereafter retain the core within the' member adjacent said slots,‘ a plurality of core 25 core barrel. The ?ngers I and 6 will, of course, catcher elements swingably mounted on said last be'caused to move inwardly when the core bar-. mentioned'ring-like member and extending into rel is pulled up because of the tension of the, said slots and adapted to swing downwardly ‘and _ spring ?ngers VI: and it thereagainst, while the inwardly with respect to said body member, and, elements ll will move inwardly because of their means surrounding said body member and over- so own inherent tendency to assume the position lying said second ring-like member to retain ' illustrated in Fig. l. said second ring-hike member'in position on said’ body member, said secondring-like member in ‘ ‘ -_ ' It isv to be noted that in‘ theoonstruction il lustrated, there is provided a structure having ' terconnecting said ring-like 'body'and said last a substantially smooth internal bore which will otter practically novresistance to the passage of named meana. » _ . a core therethrough in an upward direction. This is because the elements I and 8 are mounted 4. In a core catcher assembly, a ring-hire body member having its upper portion of enlarged in-' ternal diameter, a plurality of core catcher ele within the slots 4, and when in their up posi - ments mounted within said body -member for‘ . 40 tion their inner surfaces are substantially ?ush with the inner walls’of the body member 3. In addition, the body member I is made of slightly downward and inward swinging movement with '40 respect thereto, and a ring-like spring member ‘ ?tted within the upper portion of enlarged diam;v larger‘ diameter where it is to‘ receive the spring. eter on said body member and having parts en- member ID so that the inner surface .of this spring member ID forms a substantially smooth continuation of'the inner surface of the lower portion of the body member 3. , ‘ -It is further to be noted that there‘ are a ‘minimum number of parts involved in this con gaging said core catcher elements and urging, them to swing downwardly and inwardly with 45 respect to the body member. a ' 5. Ina core catcher assembly, a ring-like body member, a plurality of core catcher elements mounted within said body member for downward struction, all of the spring members being formed ' and inward swinging movement with respect 5. in one piece, and all of the core catcher ele ments I and Q having a single member form ing the' axis therefor. Moreover, the only secur thereto, and a ring-:like'spring member mounted within said body member, and having parts co operating with said core catcher'elementsto urge. ing operations required in assembling the dc? the same downwardly and inwardly with respect ' vice are the steps of spot welding the spring . to said. body member, said ring-‘like spring mem- 55 member II in place’, and of placing the rivets I her also having parts extending upwardly and in position. The device is thus capable of being ' inwardly therefrom and adapted to serve as‘ core assembled with the least amount‘ of labor and expense. - ‘ ' catcher, elements. _ g - I 6. In a core catcher assembly, a ring-like body - , ,In addition to thecforegoing. it is‘ to‘be noted member, a second ring-like member extending m . that if forinstance the spring member ill should become damaged and require replacement, it is about said body member, a plurality of core’ catcher elements swingably‘mounted on said last mentioned ring-like member and adapted to only necessary to break loosethe spot welding I I, withdraw theldamaged member, replacing it with swing downwardly and inwardly with respect to a new member andpspot welding the new mem her in place. Also, if one of the elements 5 or 6 should become damaged and require replace ment, it is only necessary to remove the rivets 9, slip the ring member 8' from the end of-the body 70 member 3, and remove the damaged element, replacing it with arnew one by a mere reversal ‘ of'this process. ' . ~ From the foregoing. it will be appreciated that said body member, and. means overlying said 65 second ring-like member to retain said second ring-like member in position on said body mem_—_ her, said second ring-like member having parts engaging said ring-like body member'and said means, respectively, for securing said means .in 70 place on said body member. - - > ' I . ~ w JOHN HOFFOSS. .