US423378A - Stone sawing machine - Google Patents

Description

(No Model.) 3 Sheets- Sheet .1. D. D. DRUMMOND. STONE SAWING MAGHINE.

Paten-ted Mar. ll, 1890.

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(No Model.) 3 Sheets-Sheet 2.

D. D. DRUMMOND. STONE SAWING MACHINE.

No.\423,3'78. Patented Mar. 11, 1890.

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Y NO. 423,378.

Y Patented Mar. l1. 1890.

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UNITED STATES PATENT VOFFICE.

DAVID D. DRUMMOND, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO LAURITZ I. LARSEN, OF SAME PLACE.

rSTONE-snwllae MACHINE.

SPECIFICATION forming part of Letters Patent No. 423,878, dated March 11, 1890.

Application led December 23,1889. Serial No. 334,622. (No model.)

To @ZZ whom t may concern:

Be it known that I, DAVID D. DRUMMOND, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois,have iny 5 Vented a new and useful Improvement in Stone-sawing Machines, of which the following is a specification.

My invention relates to that class of machines in `which the saws are strung across to between the frames of a sash which oscillates or reciprocates back and forth horizontally; and the object of my invention is to provide a mechanical movement capable of giving to the said oscillating frame a more even and perfect motion than has been heretofore given it. In the machines now in use the sash which carries thesaws is usuallysuspended from hangers at each corner, which permit the frame to be swung back andforth like a 2Q pendulum, giving it of course a motionthe lowest point of which is in the middle of each oscillation, and bringing the saws in contact with the stone that is being cut at that point, and being raised away from it at each end of 2 5 the oscillation but it is found that this motion of the frame gives the saws too short a contact with the stone for most effective cutting. Parallel motion and rollers have been tried,but in these the difficulty of raising the saws at the end of each stroke in order to allow the cutting material to get under them must be overcome. My invention aims at prolonging this contact and still raising the saws sufiiciently at the end of each stroke, 3 5 and this I accomplish by means of a system of cams and eccentrics and levers, as hereinafter described, and particularly pointed out in the claims.

Figure 1 is a sectional view of my machine, taken on line a; a', Fig. 2. Fig. 2 is a sectional end view of same on line c z, Fig. l. Fig. 3 is a detail view of a part of the machine, showing the hangers and the shafts from which they are suspended and the pins by which they are attached to the sash. Fig. 4

is a detail view of the cam, segment, and pinion by which the eccentric is actuated. Fig. 5 is a plan view of the same, taken on line y g/,Figh Fig. 6 is a detail view of the eccentries, hangers, connecting-rod, and sash.

A represents the frame of the machineg-B,

the stone to be operated upon; C, the sash in which the saws S are strung.

` D D are the hangers by which the sash is suspended. 55

E is the pitman by which the sash is reciprocated.

F F are the gears which drive the feedscrews I I.

I-I H are the eccentric bearings fixed upon 6o the axles or'shafts .I J, and from which the hangers D D are suspended.

P P are the pins by which the hangers are attached to the sash C at each corner.

O O are arms integral or attached to the eccentrics, and N is a connecting rod by which all the eccentrics are moved simultaneously.

L is a grooved cylinder or cam upon the I shaft K. 7o

M is a toothed segment pivoted at Q upon the crosshead R.

G G are the guides upon which the crossheads R R slide.

K is a feather way or spline ou shaft K in which a feather upon the cam L slides, allowing it to slide longitudinally, but not to turn upon the shaft. I

-V is a groove in the cam L in which the stud WV on the segment M runs. The seg- 8o ment M. meshes with the pinion T, and by the rotation of the cam L, having the groove V, in which the stud W runs, the pinion T is revolved, and thereby the eccentric I-I, integral with or attached thereto. The groove in 8 5 the cam is so shaped and the rot-ation of the cam so timed by the chain-wheel or otherpositive motion which drives it that as the sash C advances in its oscillation out of the perpendicular position shown in Fig. 6 the ec- 9o centric bearings I'I II, from which the sash is suspended, revolve sufficiently to lower the point of suspension, as seen in Fig. l, keeping the sash at the same height throughout the stroke, and giving it ahorizontal motion. lVhenA the pitman E reaches the position shownin Fig. 1 and its forward motion is about over, and while it is passing the dead-center, and the desired length of contact between the saws and the stone is reached, the revo- Ico lution of the cam brings the arms O O into their vertical position, again raising the eccentric bearings and allowing the cuttingfmay terial togetf beneath the saws. zThen by the time the return-stroke is about to begin, or as soon as it is well under way, the rotation of the cam will have swung the arms O O back to the opposite position to that shown i-ruFi'g.I 1,?and'v the same process 4gone through? in the reverse direction. :Thus it .will Avbe seen that during each complete forward and back stroke of the saws the arms O are in the. Vertical position four times once 1vat Aeaeh end and twice in the middle of the stroke.

The form of the cam L determines the move-g l ment of* the eccentric bearings,A and maybe so varied as to give aY longer or shorter con. utact of the saws or a greater or less clearance at each-endof the stroke, .as desired. Ido; not wish to limit myself in this respect. A-l'soy in place .ot thesegmentMand pinionfl a-'lever may be substituted, one end' beingattached, to the eccentricand the other running in the grooveof the cam. This same object, namely-, the raising-and: lowering atwill of the point of suspension of the hangers--may'also'beaccomplished by means of a ixedlever, one lend of -`which.engages the cam and.I the other. end carries the Vhanger-journals; but in. this latter method theleverfwould simply be the equivalent of my eccentric Theeccentrics are fixed upon the shaftsJ Landi they-armsvv O` O, connected by the rod-N so that theynall movel together; but I dof not consider this' an essential feature of my invention, as4 other suitable connectionfmaybe used for moving them simultaneously.

`Thefeed mechanism ofthe machine is of the :usualfform @The feedaserews'v I, driven by anyvsuitable mechanism, as the gears F, pass advancedas the stone isl cut.

=The cross-headR is extended to form journals for the shaft K and a yoke for the cam L. The cam advances with the cross-heads sliding in; the `spline K.

i/Vhat I claim, and desire to secure by Letters Patent, is-

1."The herein-described stone-cutting machine,consisting of i' the combination of the oscillating frame carrying the saws, the hangers by which said frame issuspended, the eccentric bearingsy from -Whiehsaidl hangersare suspendedfthe f adj ustable. cross-heads upon whichsaid `eccentric bearingslare.locatedgand 1 the 'camfsegmentaan'df pinion carried by'said 1 cross-head, byrw-hieh said-eccentric bearings .are rotated, all substantiallyasfshown and described. v

2. The herein-described stone-sawlngmachine, consisting of the combination of y the yoscillatin g frame C, hangers lD; D, eccentric bearings. H H, cam iL, segment M, pinion lT,

y arms O O, connecting-rod N, feed-.screwsIL splinedshaft K, and' cross-heads R5 R', allsubstantiallyzas-.shown .and described.

fDAVID 2D. ifDRUMMOND. .Witnesses: v

WMM.LEfLll/IQYNE, `1LoU1srV..;LE aMoYNE.

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