US2925259A - Boring type continuous miner bit mounting device - Google Patents

Description

Feb. 16, 1960 2,925,259 2 v BORING TYPE CONTINUOUS MINER BIT MOUNTING DEVICE Filed April 21, 1958 c. H. BROWN 2 Sheets-Sheet 1 g INVENTOR Clarence H. Brown 4 M ZATT'ORNEV 12,13 Fig. 3

Feb. 16, 1960 c. H. BROWN 2,925,259

BORING TYPE CONTINUOUS MINER BIT MOUNTING DEVICE Filed April 21, 1958 r 2 Sheets-Sheet 2 INVENTOR By Clarence H. Brown Y mining machine,;mouiitingthe hits'iniclustersfor tfied formof bit' mounting nieaus fora 'co'ntinuou'si rr'iin ing' 'nachine', whichjisreadilyfletachable'from the rotary cutter support 'for thef nachirie and accommodatesthe, 1

v :taken substantially along l'ine 3,-3 ofFigure 2;;and.

' cutterbits, heretofore, have been individually supported cutter block for a continuous mining machine 7 j rangedl'as" to clampa cluster of bits theretoand held in position on the cutter supportofjthe machine byga' single 1 'readily detachable fastening rneans;

7 portand the bit mounting means therefor,

mining machines which maketboring cuts in a coal face 70' V as the boring head is rotatably driven'and axially; fed into the coal face, so need'only herein be shown and Z1 1"; .1 rdescr bed suflicient detail to render the presen vention readily understandable.

tome-ms dimming-mitt MOUNTING DE E larence H; Brown, Chicago, 11],, asslgu'or to Goodman: anufacturin Comp u y, -chicago lll a corporation Ythe cutter support 12.

of Illinois 1 p The cuttersupports 1 '1 construction, and'are'in the'g'eneral form of plate's'welded App-Manon -9 or otherwise secured to :the arm 11 and extending for- -This invention relates; to improvements in cuttersfor 16 'coal and the like and morelparticularly relates to' an =irn- 4 proved mounting means for the cutters of a continuous mining machine. o 7 In continuous mining machines of the boring type, due to the continuous operation of the machine, the cutter bits rapidly become dull andamust be changed quite -fr e-' quently, particularly where the machine is operating in coal having impurities such as'sulphur balls therein; The

16 on said supports, to support-the cutter bits to conform" cut concentric annular kerfs in the coal face. *The :cuttersupport 12-is herein-shown as-havinga kerf out by the bits 16 and break down the core between the supportslZ and llm' I a I V 1 The'cutter bits 16 are each of-a similar construction,

on annularly travelingsupports and have been held in place by set screws and'the' like", or by the taper of the shank'of 'th'ebit and the socket therefor While su'clti' T I V holding means have been generally satisfactory insofar as r 111 t e a va ce faceof the shank and may be made from an abrasive resistant hardened cutting material, such as holding the bit in place is concerned, each hit must be" v V I p .7

individually removed from its socket, which is necessarily a tungsten 1 The Shanks 20 are p fq at tyf avtime consuming process particularly where the bits may angles'wlth respect to the boss 19 t0 Posltlofl the Cutting become jammed ,in their fsockets. i

Alprincipal object oi h present invention'istoprovide an improved mounting 'rneans for the bitsof a continuo ii forward end thereof. The cutter tip 21 may be recessed labementqas a unit I scribed as the specification proceeds.-- 5 i 1 t a p b1ock115 is saddle-shaped in cross-section r ofthe inventiorfli"to provideja sirripli-" gwsThe c tter replacement of dull bits'wi'thsharp bitsi ra cluster} A still furtherobjectof the invention, is to; vide s a i 261is shouldered-at its inner end, as indicated by reference These and other objects ofthe invention will appear from time to time as the following specificatio'rifproceeds and with referenceto the accompanying drawings wherein; J

Figure 1is a fragmentary front endview of the boring head'of a continuous mining machine showingone of the, bit mounting means in vertical section, with the bits broken away and shownin section; I Figure 2 is an ,end view of the bit mounting means shown in Figure 1', looking substantially along line 2+2 of Figure 1 with certain parts of the mounting means and bit support shown in section in order to' illustrate the :fastening means therefor; V I r V Figure '3 is an enlarged fragmentary s e ctionalview bit -16 and accommodate the apertured 'p'ortions of the b'it'sg'to be aligned with the through' bolt 23." The bit engaging slots 26 have communication with cut-away portions 29 inthe legs of the.blockt15 to impart re- 'siliency in the block 15 and head 24 thereof, @to accommodate opposite faces of the slots 26 to, be drawn into Qtion upon tightening of the nut 28 on theend of'the through'bolt 23, and to exert a pressureon said nut to hold said nut from loosening during operation of the 6 engaging slot: 26 ha'sicommunication with "cut-away port ions{30in'ithe1legs 25 and 'that the cut-'awayiportions 30 V a are shorter'than the cut-away portions 29 to provide Figure 4 is a fragmentary plan view of the cutter sup- 3 i i i j therein.

In'the embodiment of the invention illtistrated'in the 65 .drawings, reference numeral '10 generally designates a rotatable boring head for a boring type iof continuous mining machine. The boring head "10 j'may be "of a -well known form commonlyiused inboring continuous head '36 on one end thereof, engageable with the outer margin offthe leg 25, which is engaged by a spring i a The boringhead 10 includes a radial arm 11 extending 1 radial-ly from a central hub (not shown) and-i having' a V I cutter suppo'rt12extending outwardly therefrom in ra- 'diallvspaced relationj with respect to the hub and af second cutter support 13' spaced radially outwardly from 12 and-13 are each of asimilartween the bent :portions of the plates are such as tosupportcutter block'slS carrying clusters of butter bits to theannular path' of travelaof saidjcutter support-and wedge '17 'on'the outer side thereof shaped to enter the and as herein shown'include a central'boss 19 having 25 parallel forward and. rear faces having a shank 20' pro-1 jecting therefrom having a hardened cutter tip 21 on the.

tips 21 to cut clearance for the'cutter, as shown inFigure 2.: 'Each' boss 19 has a central apertured portion 22 for receiving a through bolt 23 for mounting-a cluster of bits I .ontheblock515Jas'twill hereinafter be'more clearly de-.

and-has an outer head or block portion24- having paralg l'el leg'st25'extending therefrom, engageable with opposite 'parallele'faces oftherassociated cutter bit support 12 01- 13. As shown in Figure 4, th e blockportion 24-has'a series *ofbit receiVing slots 26 therein for receiving the bits' 16 a and clamping the bitstosaid iblock upon tightening of'a nut; 28" on the end of the "through bolt '23. Each slot hiimeral'27ito limit inward movement of'thef associated 3 clamping engagement with opposite faces 'of the, heads or. body portions 19'of the bits, to clamp the bitsin posi boring l ea'd. It will here be noted that the advance bit v suflicient stock inthc legs 25jfor retaining apertures 31" 'face' of awleg 25, and as having an annular recess 37 spaced inwardly of the head 36 and inwardly of the inner passed. detent 39, m retain the pin 33 in late. The

with said slots and exteiiding detent 39 is slidably guided in thesupport. 12, in a guide slot 40 and is spring pressed into engagement with the annular groove 37 by a spring 41, seated within said support: 12. s

. The detent 39r hasranannular recess. 43. therein regis-i tering with-(the cut-away portion 15040 accommodate. a.

screwdriver or the like to release said .detentv from the annular groove 37, to. accommodate. removal of the pin. 33 when it is desired to replace the block 15 and: a.

cluster of dull. bits 16 with another block having a cluster of sharp bits carried therein.

The outer faces of the supports Hand 13 are pro-.

vided; with. back-up. shoulders. 44. abutted by the rear faces of the block portion 24 of the blocks 15 and so spaced along the supports with respect, to the apertured portions. 31 and 35 as to stop movement of the block.

portions 24 along the supports when the apertured portions 31 and 35. are in alignment with each other, 'and- 31 and 35 also take a part of the cutting reactions, as

shown in Figure 4, showing the horizontal components of force F on the cutter bits balanced by the reactions R and R; on the back-up shoulder 44 and the pin 33 or the wall of the aperture 35.

It may be seen from the foregoing that a simple and. efficient: bit mounting. has been. provided, mounting the bits ofva. continuous mining machine to be removed and replaced in clusters. It may further be seen'that the bitsare held in position in their. bit blocks by a single clamping device such' as. a through. bolt andjthat the block with its cluster is simply mounted on the cutter support and retained in position thereon. by-a singleipin.

fora substantial portion of the length thereor to irn-. part resiliency to said block portion, and clamping means for clamping said bit engaging faces with the cutter bits to retain the cutter -bits in position on 'said block in a cluster. g

2. A cutter device constructed in accordance with claim l, inwhich the clamping means includes a through I. bolt extending longtudinally through the block portion While i have herein shown and described one form in which my invention may be embodied,- it should be understood that various .rnodifications and variations of the invention may be effected without departing fromthe spirit and scope or": the novel concepts of the invention as defined by-thc claims appended hereto.

extend along opposite sidesof a movable support, said biock portion having a. plurality of bit receiving'slots therein opening to the outer side thereofv and having.

oppositely facing bit engaging faces adapted to engage opposite. faces of a series or cutter bits, with leg portions each having cut outv portions in communication and the cutter bits. I V

- 3.. ln a bit mounting deviceparticularly adapted for the boring heads of continuous mining machines and the like for mounting a series of bits in a cluster including a cutter arm having a cuttersupport extending forwardly therefrom and movablein-an annular path, a saddlelike block adapted to be mounted on said support and having an outer bit clamping block portion and parallel spaced legs extendingtherefrom and adapted to extend alongopposite sides of said support, said block portion having a plurality of slots therein opening to the outer side thereof, each slot having facing bit engaging surfaces, said legs each having cut-away portions extending for a greater portion of the length thereof in communi cation with said slots and providing resiliency in said block portion, a through bolt extending through said block portion and the cutter bits in said slots and clamping said bit engaging faces to the associated cutter bits therein, and means for mountingsaid block on 'said support and for retaining .said block from tipping with respect to said support comprising; a stop on said. support engageable with a rear. face of. said block, and a pin and apertured connection between. said. legs and said support adjacent the. advance end or said block and spaced inwardly along said support toward the inner end portions of said legs.

4. A bit mounting device in accordance with claim 3, in. which the pin. and apertured connection includes aper tured portionsv insaid legs and support registering upon engagement of said supportwith said stop, a pin. adapted to extend through the apertures of-said apertured portions] and a; detcnt'pinfor retaining said pinin position andaccessible through one of said cutaway portions;

References (Cited in the file of this patent 1 'UNl 'lED STATES PATENTS along said leg portions-

Images