US1776594A - Centralizer for drill steels - Google Patents

Description

' Sept.23, 1930. J. F. MOCK CENTRALIZER'FOR DRILL STEELS Filed Nov. 2, 1927 Patented Sept. 23, 1930 -U IT D.- TATES PATENT OFF ICE JOHN 1?. HUGE, F PHILLIPSBUQRGVNEW JERSEY, ASSIGNOR .TO INeEBsoLL-Rnin coinrAnY, OF .IERSEY CITY, NEW JERSEY, A CORPORATION \OF-NEW, JERSEY HG ENTRALIZ ER is c g c c g Application filed November This invention relates to rock drills, but more particularly to a, centralizeradapted to be 'supportedfby afrock drill'shell and V ,forming a bearing for jthe free end of the jOjneob'je'ct of theinvention' is to maintain the cutting bit of the drill steel in axial alignment with the rock drill, p'articularly when starting a new drill hole in a rock face.

Another object of the' invention is to simplify the constructionand vreduce the cost of maintenance of centralizers of this type.

/ Other objects will appear hereinafter and to all of these ends thein'vention consists of the combination of" elements and arrangements of parts substantially as hereinafter described and claimed and illustrated in theaccompanying drawings, in which Figurel is an elevation of the front end of aro c'kdrilland its shell, illustrating-the manner in which the centralizer supports and guides the drill steel, Figure 2 is a transverse view taken through Figure 1 on the line 2-2 l-ookingin the direction indicated by the arrows, and

Figure 3 is an enlarged side elevation of the centralizer.

Referring more particularly to the drawings, represents a shell of anysuitable type havinga conical projection B whereby the shell inayfbesecured to a lcolumn or other 1 suitable'support for holding the shell in fixed "position with respect to the working surface,

such as the rock U.

In the present instance," only the front end of a rock drill front head Dis shown in the drawings for the'sake of simplicity of illustration, but it is to be understood that other elements (nbtshown) of therock drill may cooperate slidably with guideways 'E of the shell'A in a well known manner. A working' implement F illustrated in this "instance as a. drill steel-extends with its rearward "end into the front head D to receive the blows'of a reciprocatory hammer pistonfnot shown) of the drill.

In certaindrilling operations, it is at times found diflicult to maintain the drill bit in,

axial alignment with the rock drill whereby the drill steel is being actuated, particularly oitnnrtn a, 1927.1 sria ir 30,552,

inclined position;

of usage wear is caused in'the chuck parts of the rock drill and as afresult thebit'end of the drill steel tends to decline-from the when the rock drill lies in a horizontal or an After a certaiIY-periodaxis of the rock'drill. Such declination of.

conditions aref"not detected until arcertain depth has been drilled or until drillf'st'eels of greater length have been'substitu'ted" for the starting steel. This condition requiresa'n in terruption in'the drilling operation to adjust the rock cide with the course of the drill hole, otherdrill to, a position which will coinwise the drill steel will bindinlthe drill hole and will greatly hinder the efic'ient operation of both the percussiveeleinentand the rotation mechanism. Moreover, if the drill steel is not maintained substantially coaxial with the rock drill it will be difiioult tO maint-ain thegauge of-the drill bit and the drill steel will require more frequent sharpeningythan would be "the case were the drill steel heldin" 7 axial alignment with of the rock drill. v I The-present invention aims to eliminatethe foregoing described unfavorable features is .disposedaboutthe drill steel F 'to form a bearing therefor near the ffon'tend 'of' the and to this end a centralizer designated by G the chuckmechanism drill steel. The centralizer G'comprisesa- 7 pair ofiarms H and Jboth of which'liave 1 a teral extensions Kat {their lowermost. ends to extend slidably into the guideways of the shellA. f M

In the inner or adjacent surfaces L of the arms Hand: J are I formed semi-circular l grooves "O for the reception of bushings P.

The bushingsP are in this instance also of semi-circular form'and are adapted to contact with each othenwhenin the operative position about thedrill steel The bushj the arms tensions K ings P seat loosely in the grooves 0 so that the said bushings and the arms are capable of some relative rotative movement.

Suitable means are provided for maintain-' ing the bushings P in the arms H and J. These means in the present instance consist of lateral lugs Q, which extend through trans verse apertures R in the arms H and J The lateral lugs Q, free ends be'yondthe apertures-R to enable the free ends of said lugs to be upset to form projecting portions S which may cooperate with the side of the arms H and J to prevent accidental withdrawal of the bushings from the said arms. V p To the end that a certain pivotal movement may be obtained between the bushings P and H and J the apertures are preferably of somewhat larger cross sectional areathan the lugs Q. In this way the bushings P willbe free to adjust themselves to the .sameoperative position irrespective of the width of the shell in which thecentralizer m y b disposal. r i r,

Means are provided for drawing together the uppermost ends T and U of the arms H and J and thus also to force the lateral exinto and maintain them in .en-

. gagement with the guideways E of the shell These means in the presentinstanceconsist of aT-shape'd latch in theform of a bolt V which. extends through an aperture Win the arm Hand through a slot X in'the arm J.

The bar or headY of the bolt V preferably bears against the sideof the arm H and a nut Z is threaded on the opposite end of the bolt I V to bear against theside of the arm J.

In .assembling thecentralizer a bushing P may be placed in each of the arms H and J and the projecting endsof the'lugs Qfmay then be upset in the mannerdescribed. After the bolt V'has been placed in the arms the V centralizer will be in readiness to be disposed about the drill steel E. This may be accomtween the arms or,

pli shed by either inserting the drill steel bearms; 7

After the centralizer has been disposed in the guideways E of the shell the nut Z may be tightened "inlthe direction necessary to both move the lateral extensions K outwardly and force them into the guideways E and also to force theadjacent surfaces of the bushings P firmly into contact with each other. By turning the nut Z down tightly against the arm .J the lateral extensions K maybe forced into the guideways E to such an extent that the centralizer may only be preferably extend with their,

I if the drill steel be of the type which is equipped with a collar or lugs or other equivalent means for preventing its ejection from the front head, the nut Z may removed by again relieving the pressure of the nut Z. Ordinarily however, it is desirable that only' sufficient friction should exist between the guideways E and the lateral extensions K to prevent the centralizer from being shaken out of the shell by the vibrations and shocks incident to drilling. When so adjusted the centralizer may be readily displaced by the front end of the front head D as said front head approaches the front end of the shell A. The centralizer will be gradually pushed out of the guideways E and may then be removed from the vicinity of" the drillhole without interrupting the drilling. j

I claim; I

l. A centralizer, for drill steels, comprising a pair of arms forming a guidefora drill steel, means integral with one end of the arms adapted to cooperate slidably with the guideways of a rock drill shell, and'means acting on the other endsof the arms to draw the last mentioned ends together for pressing the first said means laterally outward into en V gagement withsu'ch guideways. "'9

2. A centralizer for drill steels, comprising a pair of arms, bushings in the arms adapted to encircle adrill steel and seating responding ends of h alms to cooperate' slidably with theguideways of afrock drill shell, and means acting on the other ends of the arms for pressing thebushings into contact with each other and for forcing the lat eral extensions into engagement with such '10!) guideways. w v V V 3, A centralizer for drill steels, comprising a pair of arms having transverse apertures, semi-circular bushings in. adjacent sides of the arms forming a bearing for a drill steel, lateral lugs on the bushings extending loosely through the apertures, upset portions on the lugs cooperating with the arms to maintain the bushings in the arms, lateral extensions on corresponding ends of 1 the arms to extend into the guideways of a rock drill shell, and means including a bolt V tional engagement with such guideways. be. inserted between the surfaces L ofthe 4 A centralizer for drill steels, comprising a pair of arms havingtransverse aper-, tures, semi-circular bushings in adjacent sides of. the arms forming a bearing fora drill steel, lateral lugs on the bushings extending through the apertures, said lugs being of smaller cross-sectional area than the apertures to permit limited rotation of the bushings with respect to the arms, upset portions on the free ends of the lugs cooperating with the arms to .maintain the bushings in the arms, lateral extensions on correspond-w ing ends of the arms to extend into the guide Ways of a rock drill shell, and means including a bolt and nut acting on the other ends of the arms for pressing adjacent facesof the bushings firmly into contact with each other and for maintaining the lateral extensions in frictional engagement with such guideways;

In testimony whereof I have signed this specification. JOHN F. MOOK.

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