US1446191A - Cutting chain - Google Patents

Description

Feb'ZO, 1923. 1,446,191 N. D. LEVIN CUTTING CHAIN Filed June '4, 1920 L" W 44 4 ATTORNEY Patented Feb. 20, 1923.

PATENT OFFICE.

NILS 1). EV N, or cono vinus, onio assrenon rojrnn JEFFREY, MANUFACTURING COMPANY, or COLUMBUS, onro, A conronnrron or o-nm ""CUTT'ING cn'ain.

Application filed'June 4,

To all whom it may concernr I 9 a 1 Be it knownthatl, NILsD. LEVIN, a citizen of the United States, residing at Columbus, in the county of Franklin'and State of Ohio, have invented certain new and useful Improvements in Cutting Chains, of which the following is aspecificatio'n, reference being had therein to the accompanying drawingi The present. invention relatesto certain new and useful improvements in cutting chains for coal mining and other machines.

1 The, espeoialobject of this invention is to provide a chain of strong and simple construction con'iprising means form securely holding the renewable cutter bits during operationo-l the machine whichwill permit. of expeditious and convenient replacement and adjustment of said bits. 1

The means by which I attain'this object are fully set forthiuthe following specifi-. cation and illustrated in the accompanying drawings of which 1 1 1 Fig. l isaside elevation of a portion of a, chain embodying my invention. 1

Fig. 2 is a plan view partly inlsectionof one of the linksshown in Fig. 1., y 1 Fig.1 3 is a longitudinal sectional view taken along the line IIIIII,of Fig 21, y 1 Fig. 4 is a transverse sect-ionalview taken along the line IVIV of Fig. 1 showing the relation of the chain parts to the guide members of a mining machine cutter arm of wel known construction. i v 1 Like numerals refer to similar parts in the several, figures. 1 ,1 a V In the mining of coal, as commonly practiced,kerfs are, cut in the coal bodyto permit a sufficient distortion of the material adjacent said kerfs to dislodge fragments for transportation from the mine. The machines most commonly used for the formation of said kerfs are provided with cutting tools removably attached to suitable chains by the movement of which said tools are forced into the coalto cut it. Tools so used become dull, requiring renewals which occasion interruption of the operation of the machine, at more or less frequent intervals depending upon the character of the material being mined. I am aware that. many devices have been proposed for attaching the cutter bits to mining machinechains which, while securely holding them in correct position dur- 1920. serial-No. 386,479.

ing operation, will permit their quick and easy replacement and adjustment.- However all such devices with whichl am familiar possess certain inherent defectswhich it is the objectof the present invention to overcome." 1 1 1 1 In thedrawings I have illustrated a mining machine 1 chain comprising a series of block links 1 connected by strap links 2 and pintles 3. The chain thus formed is adapted to slideupon the edge of'the cutter bar 4 between the side plates 5 which are provided with hardened steel renewable guide bars 6. Formed on each of the links 1 and 2 arelaterally exteudingflanges 7 which engage the inner-edges of the guide bar 6 to prevent accidental displacement of the chain.- Formedon each of the block links 1 is an .upwardly projecting extension ,8 having an aperture 9 in which is slidably mount ed a renewable cutter-bit 10. The bit-1O is formed with astraightshank 11 ofsuch shape and proportions as to forma snug sliding fit with the sides of the aperture 9.,

Formed in theextension 8, and extending longitudinally forward from r the aperture 9, is a slot 12in which is'mounteda locking cam 13. The cam 13 is rotatable about a transversepivot pin l l vand, is so formed that when rotated to cause its rearward side to move inwardly of. the chain it will engage the bit, shank 11 and press it against the rearward surface of the aperture 9 to frictionally grip the bit 10 against movement relative to the blocklink 1. Formed on the cam 13 are two oppositely disposed faces 15 and 16 adapted to be struck by aninward blow of a hammer, or other suitable tool, to

cause the rotation of the cam about. its pivot 1 pin 14. When the cutter bit 10 has been placed in the desired position of adjustment the cam18 may beflrotatedinto contact with the shank 11 and, by a light stroke of a suitable hammerupon the face 15, driven into forcible'engagement therewith to pro duce a. wedgi'ng action which securely grips the bit shank against movement relative to the block link 1. The form and location of the cam 13 cause it to co-operate with the tendency to downward movement of the bit thereby increasing its gripping effect as the working pressure upon the bit increases. When it is desired to remove or adjust the bit 10 a light stroke of the hammer upon. the

surface 16 is sufficient to rotate the cam in the bit releasing.directiomand permit free movement'of'the bit longitudinally of the aperture 9.

WVhen a cutter chain is associated with the cutter bar of a mining machine, as illustrated in Fig. 4, the guide plates 0 completely enclose the chain parts with the exceptingconvenient adjustment-of the chain in substantially all positions of its path of travel. This increased facility with which thebits may be adjusted in all positions of the chain greatly increases the efliciency of operation of the mining machine.-

What I claim is: a 1 1. In a chain of the class described, the

combination with a block link, an aperture in the block, a cutter tool having a shank longitudinally slidable in'said aperture, and a rotatable cam adapted to 'engage-said shank to'clamp said tool in any preferred position .of adjustment.

JIn a chain'ofthe class describedQthe combination with a block link, an aperture in the block, a cutter tool having a shank longitudinally adjustable in said aperture, and a rotatable cam mounted forwardly of said aperture and adapted to engage said shank tolock said tool in adjusted position.

3. In achain of the class described, the combination with a block link, an aperture in the block, a cutter tool having'a shanklon gitudinally slidable in said aperture, a cam mounted in said block at the forward side of I said aperture to contact therewith and so shaped that the normal working pressure upon the bit tendsto rotate the cam in a v directionto lock said bit in adjusted posi tion.

, 4,. In a chain of the class described, the combination with a block link, an aperture in the block, a cutter tool having a shank longitudinally slidable in said aperture, and a rotatableniember adapted to frictionally engage said shank to hold said tool in adj usted position.

5. In afchain of the class described, the combination with a block link, an aperture in the block, a cutter tool having a shank longitudinallyslidable in said aperture, and a rotatable-member mounted in said block at the forward side of said aperture to frictionally engage said shank and so shaped thatthe normal working pressure upon said bit tends to increase the frictional resistance to movementof said tools' relative to said links. a I 1 7. In a chain of the class described, the combination with a block link, an aperture in the block, a cutter tool having a shank longitudinally slidable in said aperture, a rotatable cam adapted to be forced into engagement with said shank to clamp said tool in adjusted position, and means tor'otate said cam 3 1 8. In a chain of the class described, the

combination with a .block link, an aperture .in the block, a cutter tool having a shank longitudinally slidable in saidaperture, a

rotatable cani adapted to engage said shank,

and oppositely disposed faces formed on said cam and adapted to be struck to cause rotation of said cam. i j

9. In a tool holder of the class described, the combination with a body,an aperture in said body, a tool havinga-shank longitudinally slidable in'said aperture, a rotatable grip mounted on said body adjacent said aperture and so disposed'that'pressure on said tool inwardly of said aperture tends to tightensaid grip upon said shank.

' 10. In a tool holder of the class described,

the combination with a body, an aperture in saidbody', a tool having a shank longitudinally slidablein said aperture, a, gripping member mounted on said body adjacent said aperture and so disposed that pressure'on said tool inwardly of said aperture tends to tighten said grip upon said shank. I

"In testimony whereof, I aflixmy signature.

NILS Dj LE IN. v

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