US222775A - Improvement in circular-saw mills - Google Patents

Description

I A. CUNNINGH'AMg Circular Saw-Mill.

No. 222,775. Patented Dec. 23, I879.

N,PETERS. PHOTO LITHDGRAPHER, WASHINGTON. D C

NTED STATES PATENT ALBERT CUNNINGHAM, OF MILWAUKEE, WISCONSIN.

IMPROVEMENT IN CIRCULAR-SAW MILLS.

Specification forming part of Letters Patent No. 222,77 5, dated December 23, 1879; application filed December 30, 1878.

To all whom it may concern:

Be it known that I, ALBERT CUNNINGHAM of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Saw-Mill Feed-Works; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it pertains to make and use the same, reference being bad to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification. My invention consists of a novel arrangement and combination of the carriage of a circular-saw mill, the motive-power employed to drive it, and the medium by which the power is transmitted to the carriage. My device serves to make the motion of the carriage more smooth and steady, and gives the sawyer more complete control of its motions, thereby enabling him to out a greater quantity of lumber in a given time, and to do it with less labor.

In the accompanying drawings, Figure 1 is a sectional view of my'invention, showing the position and arrangement of all its parts. Fig. 2 shows the double rack underneath the carriage and the two pinionsmesh'inginto it. Fig. 3 is a brake used to check the motion of the carriage. Fig. 4 shows a part of one of the upright shafts, with the brake-cone attached. Fig. 5 shows the upper bearings of the shafts driving the carriage.

A is the carriage, of the ordinary well-known form in use in circular-saw mills, rnnnin g upon the tracks T T in floor of mill f f. F is a double-faced rack, which I prefer to place at or very near the center of the carriage- E E are spur-pinions meshinginto the double-faced rack F, one on each side. The pinions E E are keyed upon the upper ends of the strong parallel upright shafts B B, the lower ends of which revolve in strong fixed bearings in the supporting-beam I. Upon the shafts B B are also keyed the gearwheels H H, which mesh into each other and serve to connect the shafts- B B. O G are conical pulleys keyed upon the shafts B B, near their middle portions. D is a double annular conical-shaped brake pressin g against the conical surfaces of the pulleys G O. N is a lever pivoted near its middle at d,

to one end of which, by means of a link, the brake D is fastened, and to the other end of which is attached the upright rod 0, which terminates above the mill-floor in a flat step, by stepping upon which the sawyer is enabled to press the brake D against conical pulleys O O, and thereby check the motion of shafts B B. M is the cylinder of the steam-engine employed to drive the carriage. The one shown in the drawings is a trunk-engine, and its connecting-rod L connects with crank K, keyed upon one of the shafts B B.

By means of the gear-wheels H H the other shaft B is driven"; and by means of the pinions E E they drive the carriage A through the rack F. I prefer to have the shafts B B upright, and to also employ anupright doublefacedrack, F; but no insurmountable difficulty prevents the placing of the shafts B B horizontally, and the employment of a horizontal double-faced rack instead of an upright one to be driven by them.

The motion of the carriage is reversed by reversing the motion of the engine.

By connecting the engine directly with shafts B B, and transmitting their motion to the carriage in the manner shown, I make the motion of the carriage positive. By the employment of the two shaftsB B and the doublefaced rack F, I prevent side friction on the tracks of the carriage, and by this part of my device and the use of upright shafts B B1 prevent the jolting and uneven motion of the carriage in great measure.

The above-mentioned advantage is gained by the use of a directly-connected engine; but, of course, the engines motion might betransmitted to shafts B B or a shaft, B, by means of gearing on an engine-shaft driven by the engine.

I prefer a trunk or some variety of rotary engine as a motor, because it'is more compact. If any but a rotary engine is'used two cylinders should be used, so that the machinery may be started with uniform readiness at any point.

claim- 1. The combination, incircnlar-saw mills, of an engine, M, with upright shafts B B, connected so as to rotate simultaneously, and pro Having thus fully set forth my invention, I l

Yided with pinions E E and the double-faced provided with brake-cone G, and brake D, subrack F, substantially as and for the purposes stantially as and for the purposes specified. set forth. In testimony that I claim the foregoing as 2. In circular-saw mills, the combination of my own I affix my signature in presence of an engine, M, with upright shaft B, when protwo witnesses.

vided with pinion E, and rack F, when attached ALBERT GUN NIN GHAM. to the saw-mill carriage, all substantially as Witnesses: and for the purposes hereinbefore set forth. E. H. BUTTUM,

3. The combination of engine M, shaft 13, IRVING T. FORD.

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