US2610829A - Mining drill - Google Patents

Description

Sept- 15, 1952 E. J. HUcKsHoLD l 2,610,829

IIIIIIIIIII f Patented Sept. 16, 1952 'UNITED S TATES PATENT UF'F'I CE 2,610,829 n ,MINING DRILL Elmer J.;Huckshold, St. Lous,'Mo,., assigner to 'Central Mine Equipment Company, StQIaouis, li/Io., a'corporation of Missouri polinomioctober,12, 1949, serial Nei-20am claims. (c1. c55-e9) This -invention ,relates generally to mining drills.. particularly tn drllls of thecharacter wherein `the cutting bits are removable and replaceable, Vvbeingheld, in position; by a wedge.

Mining drills of the character above referred to are in common use, typicalexamples being shown by the ,patents of \;Cook:1\l0s..`2,0l0,5,09, 2,010,510, 2,109,`6,13and.2,237l133. ,Such mining drills are provided with a permanent head, adapted to be in the art,..thecriteron,being that the-wedge have one endl (usually the outerlffexposed to. receive a blow in...ar.direction,which Will-tighten the wedge and bitsin. the socket, andthat it have its other end exposed .to .receive-a .blow which will loosen the wedgeeand bit assembly within the socket.

In the normal use of such mining drills, vibration of the bitstends'tmgand frequently does, loosen, the assembly of bitand wedge, with resultant loss of the parts. The bits are quite commonly of the throw away type, but the wedge is intended .tobewazpermanent :part of the apparatus.

The objectof the present invention, generally stated,is Atoprovde a mining drill of the vcharacter aforesaid, wherein the Wedge is Vsecure against accidental loss from thesocketin Athe head.

.A furtherobject of the rinvention is to provide aminngdrillof the character aforesaidrwhere-k Figure 3 is a perspective view of .a typical wedge aseniilvlfyed inthe head shown in Figure 1. but provided with the .anchoring means of the present invention.

.Generally stated, the present, invention contemplates thelprovision of a removable anchoringpin in a ywedgeoi...the character aforesaid. The anchoring pinis inserted throughaholeprovided in the exposedA rear end :of the wedge,so as to extend into contact with,va-ndy bedeformed by, engagement with thewall ofthel socket within which the wedge isreceived. nIn order-to accommodate the interior end vof the anchoring Din, and assist in deforming it, the wedge ispreferably provided, at a location within'the socket, with a recessy ofa volumesumcientto tightly accommodate the projectingend of Athe anchoring pin. Theanchoring pinis preferably resilient, and may be an ordinary cotter key, Whichis extended through thev wedge so that its freeend (on the interior ,of the socket) `extends in the direction which the wedge must be moved to` loosen the assembly within the zsocket. Such an anchoring pin not only inhibits4 loosening ,of the wedge, but positivclyrprevents lossof ,the wedge Ainthe event of accidential loosening, eventhough the bits may be 10st.

Referring nowto the drawings, the head shown in Figure ll is providediwitha. pair;,of asocketszl. eachadapted to receiveapair of cutting bitsg2, heldin position withinthesccketbyy a wedge 3. In the form shown in the drawing, the socket I; is tapered, being of larger area at the upperend than at the lowery end. The wedgeis similarly tapered, so that-even inthe vabsenceof the bits 2, the wedge 3 cannot move downwardlyfthrough the4 socket so as to become lost. Accordingly, the only directionjin-Which` the-wedge` may be kremoved from -the f socketl `is iby; movement nof the wedge upwardly relative to; thesocket.

.The particularfform of wedge `shown inthe drawings is merely illustrative orar-great variety of ,forms which :such wedges customarily take,

and ,they invention is not. limited. to the conflguration of the wedgeas-shown.

The present invention contemplates the provision of a hole 4 in the rear end, which is the smaller end, of the wedge 3. On the side of the wedge 3, which is concealed when the wedge is in operative position, the mouth of hole 4 is enlarged. as shownl at 5, the degree of enlargement depending upon the volume of the extremity of the anchoring pin to be accommodated therein.

An anchoring pin 6 is inserted in hole 4 after the Wedge 3 is in position within socket I, and

driven home, so that only the head thereof extends beyond the outer surface of wedge 3. The pin 6 is considerably longer than hole 4, so that a substantial extremity of the pin 6 is bent over and deformed within recess 5, against the inner wall of socket I, as shown clearly in Figure 2. Such deformation of the pin 6 not only provides a resilient anchorage against the interior wall of the socket, but also prevents the pin 6 from falling out of the hole 4. While the pin 6 is in position within the hole 4, the wedge 3 cannot be removed from its socket I. The deformation of the pin 6 which occurs upon its being driven into contact with the interior wall of the socket is, however, not such as to positively prevent the removal of the pin 6 by forces which may be applied directly to its head. Accordingly, a sufficient draft applied at the head of pin 6, in the direction in which the hole i extends, Will accomplish removal of the pin 6 when it may be desired to remove the same, so as to free the Wedge 3 for removal. The pin 6 need not be removed to replace the bits 2, however. Although a harder blow is required to remove wedge 3 within its socket when the pin 6 is in place than when no such pin is provided, the degree of anchorage provided by the pin 6 is not such as to prevent the movement of the wedge relative to the socket under heavy hammer blows, to an extent suiicient to free (in one direction) and tighten (in the other direction) the bits.

From the foregoing description, those skilled in the art should readily understand the structure and operation of the anchorage, and realize that it accomplishes its objects. While a full disclosure of one embodiment of the invention has been given, it is to be distinctly understood that the precise forni of drill head, socket, wedge, and bit shown in the accompanying drawings is merely illustrative, and that the anchorage of the present invention is applicable to all such wedge, socket, and bit assemblies, irrespective of the precise form thereof, provided there is some exposure of the wedge behind the socket, or in the direction from which the wedge must be driven to loosen it. It is therefore to be distinctly understood that the invention is not limited to the precise form shown, but that it is applicable at large to such drill heads, and is susceptible of many modications, without departing from the spirit of the present invention, or the scope of the appended claims.

Having thus described the invention, what is claimed and desired to be secured by Letters Patent is:

1. In a mining drill head having detachable bits, a wedge for retaining the bits in position and a socket for accommodating the wedge, the improvement which comprises a resilient pin accommodated in a hole in said wedge, one end of said pin being exposed beyond the boundaries of said socket for a distance suiiicient positively to prevent removal of said wedge from said socket, and the other end frictionally engaging 4 an interior wall of said socket at a position concealed by the wedge.

2. For use with a mining drill having a socket for the reception of a bit and a retaining wedge; the combination which comprises a wedge having a part projecting beyond the side of the socket opposite which the wedge is inserted in the socket, and a removable pin mounted in said projecting part of the wedge, said pin projecting outwardly from the wedge for a distance suiiicient positively to prevent removal of the wedge from the socket and inwardly from the wedge for a distance sufilcient frictionally to engage the interior wall of said socket.

3. In a mining drill head having detachable bits, a wedge for retaining the bits in position and a socket for accommodating the wedge, the improvement which comprises a resilient pin accommodated in a hole in said wedge, one end of said pin being exposed beyond the boundaries of said socket, and the other end engaging an interior wall of said socket at a position concealed by the wedge, said wedge having a recess over-lapping said hole and accommodating the end of said pin which engages the interior socket wall.

4. In a. mining drill head having detachable bits, a Wedge for retaining the bits in position and a socket for accommodating the wedge, the improvement which comprises a resilient pin accommodated in a, hole in said wedge, one end of said pin being exposed beyond the boundaries of said socket, and the other end engaging an interior wall of said socket at a position concealed by the wedge, the hole in the said wedge extending at a substantial angle from the perpendicular to the interior wall of the socket with which the pin engages.

5. A wedge for use with a mining drill having a wedge and bit receiving socket; said wedge being provided with a hole extending diagonally therewith through and terminating at one face in a position which will be exposed when the wedge is disposed within the socket and terminating at the opposite face in a position which will be concealed when the wedge is disposed within the socket, said opposite face of the wedge being provided with a recess overlapping the mouth of said hole and in disalignment therewith.

ELMER J. HUCKSHOLD.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 627,659 Spry June 27, 1899 791,001 Bittenbender May 30, 1905 2,010,509 Cook Aug. 6, 1935 2,010,510 Cook Aug. 6, 1935 2,109,613 Cook Mar. 1, 1938 2,114,799 McGlaunghlin Apr. 19, 1938 2,237,133 Cook Apr. 1, 1941 2,289,935 Rufus July 14, 1942 2,510,751 McGlaughlin June 6, 1950

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