US410623A - Gang-saw mill - Google Patents

Description

(No Model.) 2 SheetsSheet 1..

T. S. WILKIN. GANG SAW MILL.

110.410.6323. Patented Sept. 10, 1889.

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(No Model.) 2 Sheets-Sheet 2. T. S. WILKIN.

GANG SAW MILL.

No. 410,623. Patented Sept. 10, 1889.

UNITED STATES PATENT OFFICE.

THEODORE S. WVILKIN, OF MILIVAUKEE, "WISCONSIN.

GANG-SAW MILL.

SPECIFICATION forming part of Letters Patent No. 410,623, dated September 10, 1889.

Application filed March l 1889. Serial No. 301,692. (No model.)

To aZZ whom it may concern.-

Be it known that I, THEODORE S. WILKIN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented certain new and useful Improvements in Gang-Saw Mills, of which the following is a specification.

My invention relates to gang-saw mills; and it consists in the combination, with a sash or frame, of a cranked shaft, a steam-cylinder and its piston, a pitman or pitmen connecting the piston with the cranked shaft, and a pitman or pitmen connecting the sash with said shaft.

The object of the present invention is to produce a wide gang, secure an economical utilization of the power, and a steady and regular movement of the parts, thereby permitting good and rapid work without any tendency to the racking or twisting of the frame.

In the drawings, Figure I is a face view of my improved saw-mill, and Fig. 2 a similar view of a slightly-modified arrangement of the same.

The main frame of the mill may be made of wood or iron, or both combined, and will of course be varied according to the style and capacity of mill to be built and other considcrations.

The mill shown comprises uprights A A, a cap-plate B, and a bottom cross bar or plate 0.

E and F indicate, respectively, the upper and lower feed-rolls, G the saw-frame, and II the saws carried thereby, all of which parts may be of any desired form or construction, and capable of variation without in any way departing from the spirit of my invention.

I indicates a horizontal shaft mounted in suitable bearings in the uprights A A, pro vided with four cranks K K K K, the cranks K I" being between the cranks K and K, and set diametrically opposite them.

Mounted upon a fixed part of the framework, preferably upon the cross-plate O, is a cylinder M, the piston-rod N of which extends from the bottom thereof and is @011- nected with a cross-head 0, which will advisably, though not necessarily, be seated at its ends in guides formed upon or secured to the inner faces of the uprights A A.

Pitmen Q Q connect the central cranks K K with the saw-frame G, while pitmen R R connect the cranks K K with the crosshead 0, the said parts being so arranged relatively to each other that when the piston is at the lower end of the cylinder the sash will be at its highest point.

The main ,shaft I will be provided with connections from which motion is imparted to the feed mechanism, an d will also be arranged so as to operate the valve-stem V, by which the admission and emission of steam to and from the cylinder is controlled; but as these features form no part of the present invention they are not shown in the figures.

Between the uprights A A the shaft I will be provided with balance-wheels \V WV.

If the steam be admitted to the upper end of the cylinder, the piston will be forced down and will carry with it the cross-head and the pitmen R R, connecting the same with the cranked shaft. As the shaft is thus turned or rotated, the pitmen Q Q, connecting the said crank-shaft with the saw-frame, carry said sawframe upward, and of course as soon as the piston completes its movement and begins to return to the upper end of the cylinder the saw-sash will be carried downward.

By locating the cylinder directly beneath the shaft, as shown, the thrust is in the direction of the length of the frame, and there is less tendency, therefore, to strain or twist the frame than under the prior plans. So, too, by mounting the piston upon the main frame I am enabled to make a very compact mill, thereby economizing in space, which is a matter of importance.

The cross-plate G will advisedly be provided with two downwardly-extending frames A A, which have the same general direction as the side frames A A, and which serve as guides for the sliding cross-head 0.

It is obvious that so far as the arrangement of the cylinder and attendant parts is concerned the invention is susceptible of application to mills using narrower gangs and requiring but a three-crank shaft, such an arrangement being illustrated in Fig. 2, in which figure I have shown the feed mechanism and valve-actuating mechanism, which are omitted from Fig. 1, and which form no part of this invention.

I do not wish to be understood as admitting'that the three-crank shaft shown in Fig. 2 is the equivalent of the construction shown in Fig. 1, except in the particulars above mentioned, for it is clear from actual use of the four-crank mill that I am enabled to cut more than twice as much lumber per day as can be cut with a three-crank mill.

No claim is made herein to anything claimed in my pending applications, Serial Nos. 297,595 and 311,561.

Having thus described my invention, What I claim is I. In a gang-saw mill, the combination, with a frame-work, of a reciprocating saw-sash, a cranked shaft below but connected with the sash, a cylinder below the shaft, a piston working in the cylinder, and a connection between the piston and cranked shaft.

2. In a gang-saw mill, the combination, with a frame-work, of a shaft provided with two sets of cranks diametrically opposite each other, a saw-sash connected with one set of cranks, a cylinder, and a piston working in said cylinder and connected with the other set of cranks.

In agang-saw mill, the combi11ation,with a main frame, of a saw-frame, a cranked shaft, a cylinder provided with a piston, a pitman or pitmen connecting the saw-frame with the cranked shaft, and a pitman or pitmen connecting the cranked shaft with the pistonrod.

4:. In a gang-saw mill, the combination, with the main frame, of a saw-frame, a cranked shaft journaled in the main frame, a cylinder mounted directly beneath the shaft, a piston working within said cylinder, a cross-head secured to the piston-rod, and a pitman or pitmen connecting the cranked shaft with the cross-head, and an independent pitman connecting the saw-frame with tlre cranked shaft.

5. In a gang-saw mill, the combination, with the main frame, of a saw-frame, a cranked shaft journaled in the main frame and connected with the saw-frame by means of apitman, a cylinder located upon the main frame beneath the shaft, a single piston working within said cylinder and having its rod extending from the lower end of said cylinder, a cross-head secured to the said piston-rod, and pitmen connecting the cross-head with the cranked shaft.

6. In a gang-saw mill, the combination, with a main frame, of a reciprocating saw gate or frame, a cranked shaft journaled in the main frame, a pitman connecting the saw-gate with the cranked shaft, a cross-bar 0, extending across the main frame near its lower end, a cylinder mounted upon said cross-bar between the uprights A A of the main frame, a single piston working within said cylinder and having its rod extending from the lower end thereof, a cross-head secured to said piston-rod, and pitmen connecting the cranked shaft with the cross-head, all substantially as THEODORE S. VVILKIN.

Witnesses:

WALTER S. DODGE, HORACE A. DODGE.

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