US2244198A - Cutter chain - Google Patents

Description

Jun? 3, 1941. M. P. HOLMES 2,244,198

CUTTER CHAIN Filed Dec. 27, 1932 n lihl:

61/ A@ A 11am# Patented June 3, 1941 UNITED .STATE Curran CHAIN Morris P. Holmes, Claremont, H., asslgnor to K Sullivan Machinery Company, a. corporation oi'.

Massachusetts Application December` 27, 1932, serial No. 649,003L

13 Claims.

This invention relates to cutter chains, and more particularly to improvements in cutter chains particularly adapted for use with mining machines.

An object of this invention is to provide an improved cutter chain'.l Another object is to provide an improved cutter chain having improved means for holding the cutter bit in place within the bit block. A further object is to provide an improved cutter bit for a cutter chain. Still another object is -to providev an improved cutter bit having a plurality of cutting surfaces and having associated therewith improved holding means. A still further object isfto provide an improved bit .holding means for holding, a cutter bitin cutting position on a chain block These and other objects and advantages `of the invention will, however, hereinafter'more fully appear.

In the accompanying drawing there is shown for purposes of illustration one form which the invention may assume in practice.

In this drawing, Fig. 1' is a side elevational view of the illustrative embodiment of the improved cutter chain.

Fig. 2 is a transverse sectional view takenV substantially on line 2--2'of Fig. 1.

Fig. 3is a central longitudinal sectional view taken substantially on line 3-,-3 of Fig. l2.

Fig. 4' is a perspective view of the bit holder. Fig. 5 is a perspective view 'of the cutter bit. In this illustrative embodimentrl of the invention there is shown a cutter chaincomprising a bit block l having pivotally connected thereto at 2 straps 3, the bit or chain block'and strap construction illustrated being of a design in common use. The bit block I is provided with a transverse opening or socket 4 disposed at right angles to the path of travel of the cutter chain and a communicating threaded opening 5 arranged in the bit block at the rear of the'socket 4, as shown in Fig. 3. The socket 4 receives the shank 6 of a bit holder 1, the threaded opening 5 receiving a set screw 8 for engaging the holder shank to clamp the bit holder in position within the socket 4, against the forward face of the socket.l In this improved construction, the outer end ofl the bit holder l is bifurcated, herein formed with a longitudinal slot 9, and the furcations thereof have alined openings for receiving a transverse holding and abutment element, herein a holding and abutment pin I0. '.I'he improved cutter bit II is herein of triangular formation comprising a body I2 having a transverse slot or notch I3 in its outer face, and the opposed ysides of the triangle forming cutting points I4 and I5. In this instance the bit body is in the form' of an obtuse-angled isosceles triangle having its cutting points formed at ythe angles opposite its equal sides, and the holding means engages the base portion of the triangle. The nishedbit has its points I4 and I5 at its opposite ends and at the extremities of elongated faces which are alike in outline, are in planes forming a dihedral angle whose edge includes the opposite lateral extremity of the bit, and are individually symmetrical as to both major and minor axial lines.

When the bit is in place within the bit block, asv yshown in Fig. 3, the lower side I6 of theatriangular portion of the bit rests against the outer surface I1 of the bit block both forwardly and rearwardly of the forward wall of the socket 4, and the transverse pinengaging theslot I3 in the bit cooperates to hold the bit in positiomthe bit being arranged Within the slotfSr in the bifurcated end of the'bit holder and the shankr of the bit holder held in the socket 4 by the set screw 8. A portion of the inner inactive bit surface which abuts the outer surface of the chain block, engages the outer chain block surface in advance of the front wall of the chain block socket, as shown in Fig. 3. When the cutting end I4 of the bit becomes dull, the set screw 8 may be released, thereby loosening the bit to enable ref lease of the bit from the bit holder. The. bit may then be turned end for end or reversed within the bit holder slot 9, the surface I8 of the bit at that time engaging the surface Il of the bit block with the cutting end I5 then active.

As a result of this invention, it will benoted that an improved cutter bit is provided having improved means for holding the same in place within the bit `holder,vthe cutter bit being of improved design having a plurality of cutting ends .and having improved means intermediate the cutting ends adapted for engagement with improved holding means. It will further be noted that the improvedbit and holding means are of" an extremely simple design, the improved bit'being extremely inexpensive to manufacture, thereby reducing themanufacture and replacement costs` to a minimum. It will be observed further that the means for holding the .bit in position on the bit block includes a surface of the bit block parallel to the path of travel of the cutter chainand engageable by one of the plane surfaces on the bit, the bit specifically, in the embodiment of. the invention illustrated, having its inactive cutting surface resting against an 2 i l a,a44,1os t outer surface of the bit block. It will further benotedthatthebitissecurelyclampedbythe holding means illustrated; and the inactive cutting face of the bit engages surfaces on the block both forwardly of and to the rear of the holder receiving socket, with the result that since the 'pin coacts with the back of the bit, the bit is securely held by abutment surfaces engaging a ually blocked by the contacts of the inactive wall, a bit having a pair of obliquely related cutting surfaces at its opposite ends terminating in cutting points at its opposite extremities at .the back'of the bit, and a bit holder, the bit holder having an opening for receiving said bit, said bit block and bit holder cooperating to provide means for holding said bit firmly during use said bit holding means including means stantionary with respect to the bit block irrespective cutting surface of the bit with the chain block. A

The notch I3 in the bit provides both surfaces facing rearwardly and surfaces facing forwardly, and thus securely holds the bit against movement in both directions. Because the pin Il of the position of said holder'with respect to said socket and which means provides a surface forward of the forward wall of said bit block socket with which surface a surface of said bit relatively remote from the back of the latter is pressed into contact when said bit holder is pressed into said socket as far as it will go with the bit in `said-openlng, said socket being so formed in said block and said opening so formed in said bit holder that when said holder approaches the surfaces on the bit block con- 4 tacted by the inactive cutting surface of the bit when the holder shank 6 is forced into the holder receiving socket 4, a positive and effective clamping action is obtained, and a portion of the bit may be placed under compression, thus eliminating loosenesaby pressing the holder as far in wardly into its socket as possible, and then tightening the set screw. These and other uses and advantages of the improved cutter chain will be clearly apparent to those skilled in the art. y

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention maybe modied and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim asnew and desire to secure by Letters Patent is:

1. A cutter bit having a body in zthe form of an obtuse-angled isosceles triangle inside elevation and having cutting portions formed at the angles opposite its equal sides, and a notch formed in the base of the triangle and adapted for engagement with holding means.

2. In a cutter chain, a bit block. a bit having a pair of plane cutting surfaces at its opposite ends-and lying in oblique planes disposed, at an obtuse angle with each other, and means for holding said bit in cutting position on saidbit block including a surface on the bit block parallel to the path of travel of the cutter chain engageable with one of said plane surfaces on the bit.

3. In combination, a cutter bit comprising a body having opposed cutting ends formed at the extremities of plane cutting surfaces which lie in the sides of a dihedral angle, a bit block having a socket therein, and means engageable with the bit body intermediate said cutting ends for clamping one cutting surface of the bit body in position against an outer surface of said bit block, said clamping means adapted for reception in the socket within the bit block and effecting bit clamping by movement inwardly in said socket.

4. In a cutter chain, in combination, a bit is in bit holding position in said socket and said bit is in working position iny said opening a line connecting the cutting points of the bit makes anV obtuse, forwardly opening angle with the intersectinglinewhich extends into s aid'socket centrally of the latter.

5. In a cutter chain. the combination comprising a chain block having a socket arranged at right angles to the path of travely of the cutter chain, a cutter bithaving a pair of plane cutting faces at its opposite ends and lying in oblique planes disposed at an obtuse angle to each other, and bit holding means for holding said cutter bit in cutting positionon said chain block and including a bit holder having a head and a shank, said holder head having an opening for receiving the cutter bit and said shank receivable in said chain. bl'ock socket, said holding means including a surface on the block and a relatively movable surface on the holder movable inwardly and outwardly relative to said surface on the block as said shank is moved in and out in said socket, said cutter bithaving surfaces engaging said ilrst mentioned surfaces, one of said surfaces on the bit comprising one of said plane cutting faces. and .said surface on said block so positioned thereonr that the surface on the bit engageable therewith may be moved into-contact therewith by rectilinear inserting movement of the holder shank into the block socket when the bit is received in said head opening.

6. In combination, a bit having a .forward cutting face, a rearward surface making an acute angle with said cutting face and an inward surface disposed atan angle with respect to said cutting face and said rearward surface and utilizable also upon reversal of said bit as a cutting face, and supporting means for said bit including achainblock and a bit holder, said block having a socket disposed at an angle at least approximating a right angle to the path of travel of the block and said bit holder having a portion for reception in `said socket, said supporting means for said blt including, in part on said block and in part on 'said holder, means providing abutment surfacesclampingrelationship between which and said bit is establishable by inward movement of the holder into said socket while said bit remains relatively stationary with respect to said bit holder in engagement with the abutment-surface-providlng means on the latter and which abutment surfaces coact to clamp said bit against both inward and outward movement, said abutment-surface-providing means on said block providing an abutment surface stationary with respect to said block and forward lof thevforwardmost point. upon the 7. In a cutter chain, the' combina n com- I prising a chain block having a holder-receiving socket disposed at -right` angles to the path of travel of the cutter chain anda bit-engaging abutment surface, ;aV holder receivable.. in said block socket and having a bit-receiving (mening,

a double-ended reversible cutter bit having plane cutting faces terminating in cutting points at the opposite ends of the bit, said bit receivable.

'face held firmly against said block abutment surface, and means on said block `for securing said holder in bit-holding position in said block socket.

8. In ,a cutter chain,l the combination comf holderopening with its active cutting face pro- /prising a chain block having a holder-receiving socket disposed at right angles to the path of travelof the cutter chain and also having supported thereon a bit-engaging abutment surface between the forward side of said socket and the 'prising a chain block having a holder-receiving socket disposed at right angles to the path of travel of the cutter chain and a bit-engaging abutment lsurfacediii'posed at one side of said socket, a holder having a shank receivable-in saidnbiock: socket, an opening for receivingva' cutter .bit anda 'bit-'engaging abutment surface,

a double-ended reversible cutter bitl having cut-- *ting faces lying inthe sides of a triangleand terminating in cutting. points at 'the same'sidefof the bit," said cutter ybit receivable in vsaid jecting forwardly and outwardly from the holder at the outer side offsaid'block and with av portion of one of its cutting faces in engagement with ,v said block abutment surfacasaid bit also engaging said holderabutment surface, said holder abutment surface precluding movement of the bit in one directionwithin said holder opening and said 4abutment surface on said block .precluding bit' movement said holder opening in the opposite `direction, said holder upon inward movement of its shank within said holder socket clamping said bit in cutting position on said block, andkmeans on the block for securing-theI holdershank within said block socket.`

11. In a cutterchain, the combination corn- .prising a chain block having -a socket disposed at least approximately at right angles to the front. of the block, a holder receivame m said so path 0f travel 0f the cutter chain and bitsaid holder at the outer side of saidblock and with the inactive cutting face engaging said block abutment surface, said bit having a forwardly facing abutment surface engageable with said holder abutment surface for precluding forward release of said bit from said holder opening, said holder upon inward movement thereof within said block socket clamping the bit in cutting position on said block with the inactive cuttingV face held firmly against said block abutment surface, and means on said block for securing said holder in bit-holding position in said block socket.

9. In a cutter chain, the combination comprising a chain block having a holder-receiving socket disposed at right angles to the path of travel of the cutter chain and a bit-engaging abutment surface disposed at one side of said socket, a holder having a shank receivable in said block socket and an opening for receiving a cutter bit, a double-ended reversible cutter bit having cutting faces lying in the side of a triangle and terminating in cutting points at the same'side of the bit, said cutter bit receivable in said holder opening with its active cutting face projecting forwardly and outwardly from said holder at the outer side ofsaid block and with a portion of one of its cutting faces in engagement with saidblock abutment surface, said holder upon inward movement of its shank withengaging abutment surface disposed at one side 'of said socket, said socket opening outwardly through said block at the outer side of the latter, a holder having a shank receivable in said block socket and an opening for receiving a cutter bit, said holder also having a bit-engaging abutment surface, a double-ended reversible cutter bit lreceivable in said holder opening and having plane cutting surfaces terminating in cutting points at the opposite ends of the bit, one of said bit surfaces engaging said block abutment surface, when said holder is inserted in said socket with the cutter bit carried in working position in Saidopening, to prevent movement of said bit in one direction within said holder opening and said-holder abutment surface engaging a surface on said bit to preclude movement of said bit within the holder opening inthe opposite direction, said holder upon inward movement of its shank within said block socket clamping the bit in cutting position on said block with its active cutting surface projecting forwardly and outwardly from said' holder and with said abutment surfaces on said block and holder engaging said one of said cutting surfaces and said last recited blt surface respectively, and means on said block for securing said holder shank within said block socket. l 12. In a cutter chain, the combination comprising a chain block having a socket disposed at least approximately at iight angles to the path of travel of the cutter chain and a bit-engaging abutment surface disposed at one side of said socket, said socket opening outwardly through said block at the outer side of the latter, a holder .having a shank receivable in said block socket and an opening for receiving a cutter bit, said holder also having a bit-engaging abutment surface, `a double-ended reversible cutter bit receivable in said holder opening and having plane cutting surfaces terminating in cutting points at the opposite ends of the bit, one of said bit surfaces engaging said block abutment surface to prevent movement of said bit in one direction within said holder opening and said holder abutment surface engaging a sumce on said bit to e preclude movement of said bit within the holder opening `in the opposite direction, said holder upon inward movement 'of its shank within said block socket clamping the bit in cutting position .on said block with its active cutting surface projecting forwardly and outwardly from said holder and with said abutment surfaces on said block and holder engaging said one of said cutting sur.. faces and said last recited bit surface respectively, said holder shank n being movable outwardly within the block socket while the relation of the bit to said holder remains the same as when said bit is in cutting position. and outward movement of said holder within said block socket eecting disengagement between one of said abutment surfaces and said bit to enable withdrawal o! said bit from said holder opening, and means on said block for securing said holder `shank in said block socket.

13. In a cutter chain. the combination comprising a cutter bit having a pair of obliquely related cutting-surfaces' at its opposite ends tertremities at `the back of the bit, and a cutter bit supporting structure providing an opening for receiving said cutter bit and including a support element. said Vsupporting structure also providing means for holding said cutter bit nrxnly in` cuttingposition during use and including means stationary with respect to said support f element irrespective of the position of said cutter minating in cutting points at its opposite exbit with respect thereto and relative to which said cutter bit is movable; and which latter means provides a surface at the forward side of said support element and with which surface a surface of said bit is pressed into contact when said bit is nrmly held in `its positionv of useby said supporting structure with said bit in said opening, said supporting structure and said opening being so formedthat when said bit is firmly held in cutting position in said opening a line connecting the cutting points of said bit makes an obtuse, forwardly opening angle with an intersecting line which extends normal to the path of movement of said support element.

MORRIS P. HOLMES.

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