US174004A - Improvement in direct-acting steam-feed-works for circular-saw mills - Google Patents

Description

new. armscom. l DIRECT ACTING vSTEAM FEED-WORKS FOR.GJIRCUI.AP4v SAW-MILLS..

'1\To.17%,004"4 Patented Feb. zz', '1876.7

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NPERAS, PHDTOvLITMOGRAPHER. WASHINGTON. D C4 UNIT-memes DE wrrr CLINTON rnnscorr,

PATENT Quema on MARINETTE, wisconsin.

IMPROVEMENI IN DlIiI-CTeACTING` STEAM-FEED-INORKS FOR CIRCULAR-SAW MILLS.

Specification forming part ol" Letters Patent' No. 174,064., dated February 22, 1876; application filed November 13, 1875.

following specication, reference being hadto f the accompanying drawings.

lVly invention relates to that particular part of circular or rotary saw mills Ytermed the feed-works, by means of which the 10g (being supported upon its carriage) is propelled or fed against the saw, and, also, is returned or gigged back to itsorigiual position after a portion has been sawed from it, thus accomplishing, in conjunction with other mechanisms, the manufacture of lumber; and my object is to dispense with the combination of belts, pulleys, shafts, frictions, and gearing which is now in general use for that purpose, and also t0 obtain a more prompt and efficient action of the log-carriage whenin operation.

The principle of my invention consists in applying the power of steam directly tothe log-carriage, and by this power, which I `cause to act instantly and in a direct manner upon it,.to impart the reciprocating motion which it requires and the apparatus or mechanism I use for this purpose is hereinafter described and shown.

In the accompanying plate of drawings,

"Figures 1, 2, and 3 show detail views of the mechanism, Figs. 4 and 5, its application in connection with the other parts of a circular or rotary saw mill of otherwise ordinary construction.

The construction oflmy apparatus is as follows:

In the drawing, Fig. l, in section, A designates a steam-cylinder, of the same length as the greatest run or travel of the log-carriage, proper allowance alsobeing made for i `clearance at each end, to prevent the piston lj from striking the cylinder-heads B and C,

which are fitted to it.

y D is a piston-head, constructed ina manner steamtight, and of suitable form. To this is attached one end of piston-rod E,whicl1 passes out of cylinder A through the stufngbox in cylinder-head C, the other end thereof4 being attached` securely to the log-carriage by means ot the brac'ketF, which is bolted to it at a suitable point to obtain a proper travel of the 'carri-age, and, at the same time, to secure a corresponding regular travel of the pistonhad D in cylinder A. The said piston-rodi E is composed of iron pipe, though steel pipe or `solid rods may be used.

Fig. 2 shows a sedional view of steam-chest' G, containing the slide-valve H, which operates upon a valve-seat in lower part of steamchest G, in which are steam-ports I and J and exhaust-port K.

The slide-valve H is so constructed that,

when placed upon the center of its stroke, it

will present eXliaust-openin gs to both of ports [and J. L and M are steam-pipes leading from the openings of steam-ports I and J to each corresponding end of cylinder A. N is a pipe connected at opening-of exhaust-port K to convey away exhausted steam. O is a valve stem or rod attached to slide-valve H, and also to lever P, with its fulcrum R, which, with connecting-rod S and hand-lever T, enables the sawyer to operate the slide-valve H. (See plan of steam-chest, Fig. 3.) U is a steampipe leading from steam-chestlG to a boiler from which power is supplied, which it has not been deemed necessary to show. Portions of steam-cylinder A, piston-rod E, and steampipes L vand M are, removed, but they are supposed to be of proper length.

The operation of the machine is as follows: The cylinder A being securely fastened to the mill-tloor or overlay-timbers, and the piston-rod E attached t0 the log-carriage, the valve levers and rod P, T, and S are placed in position, as shown, and steam admitted through steam-pipe U into steam-chest G.

A log is placed upon the carriage when in position in front of the saw and somewhat to the let'tof the position shown in Fig. 4. Then, by means of the hand-lever T, the slide-valve H is moved in the right direction to admit sufficient steam through steam-pipe L into the cylinder A to impart motion to the log-carriage by means ot' the pistonhead D, piston-rod E, and bracket F.

In this manner the log (being upon the carriage in proper position) is propelled or fed against the saw, which cuts off a slab, board,

or plank, as the case may be, as the log passes. This heilig accomplished, the position of the hand-lever T is reversed, and with it the slide-valve H, which exhausts the steam just employed, and admits live steam into the cylinder A through steam-pipe M, by which the log-carriage is forced or gigged back to its original position before the saw, ready for the next cut, the sawyer maintaining complete ployed, with one of which to operate the logcarriage in feedin g-the other to run or gig it back to its original position.

Having thus described` the principle and "construction as well as the operation of myi invention, I will state what I claim andldesirel` to secure by Letters Patent: 1

I claiml. The methodlof applying steam-power in` a direct manner to operate log-carriages of circular or rotary saw lnills in the process of` sawing or manufacturing lumber, as specied.

2. The combination of the steam-cylinder A, with its heads B and C, pistou-head D, i piston-rod E, bracket F, steam-chest G, with l its slide-valve H, stealn-ports I and J, and` exhal'ist-port K, steam-pipes L and M, exhaust? g pipe N, valve-stem 0, leverP, with its fulcrum Y R, connecting-rod S, hand-lever T,'and steampipe U, constructed and operating together E as and for the purposes set forth.

DE WITT CLINTON PRESO/OTT.` Witnesses:

E. B. LEWIS, AMos HOLGATE.

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