US291255A - wilkin - Google Patents

Description

(Nd M0161. 3' Sheets-- Sheet 1.

T. s. WILKIN,

GANG SAW MILL FRAME.

- 110,291,255. Patented Jan. 1, 1884.

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3 Sheets-Sheet 2.'

'(No Model.)

T. S. WILKIN. GANG SAW MILL FRAME.

Patented Jan. 1, 1884.

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(No Model.) 3 Sheets-Sheet 3.

' T. S. WILKIN.

GANG SAW MILL-FRAME.

No. 291,255. Patented Jan. 1,1884.

Fig.5.

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GANG-SAW-MILL FRAME.

SPEGI FICA'IION forming part of Letters Patent No. 291,255, dated January 1, 18E4.

Application filed November 15,1883. (No model.)

ToaZZ whom it may concern.-

Be it known that I, THEODORE S. WILKIN, of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain Improvements in Saw-Mill Frames, of which the following is a specification.

My invention relates to frames for gangsaw mills; and it consists in a novel construction of the same, whereby the strains due to the movements of the sash are received and sustained in a straight line through the sides of the frame from top to bottom; and whereby, also, sufficient spread is secured at the foot or base of the frame to permit the fly-wheel to be'placed within the same between the pillowblock and sill.

The invention consists, further, in other details and features, hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a side elevation of my improved frame; Fig. 2, a face view of the same; Fig. 3, an inside face view of the lower section; Fig. at, a top plan view, and Fig.- 5 a vertical central section of the same. I

Hitherto it has been customary to construct gang-saw-mill frames either of vertical timbers tied together by cross-timbers and braces or to make them of iron side frames, either vertical from top to bottom or inclined from the base to the carriage-floor line, and vertical from said line to the top, Timber frames are clumsy, liable to become unsteadyand to decay, and are for other reasons objectionable, and hence iron frames are now almost universally used. Vertical frames are unsteady, be: causenot having sufficient spread to brace them; and the plan of inclining the sides of the lower section and making the sides of the upper section vertical greatly weakens the frame at the floor-line and causes the upper section of the frame to sway laterally when the gate moves up and down, and fails to oppose the strength and stiffness of the side framesto the strains of the sash to the best advantage. Moreover, under all plans hitherto adopted the fiy-wheel has of necessity been placed outside of the frame, because there has not been sufficient room between the sill upon which the side of the frame rests and. the pillow-block in which the main shaft is carried to accommodate said fly-wheel, nor suffi- -of basesection, a,

The base-section is formed with a forked upcient vertical space therefor when in its necessary position.

To give the utmost strength, stiffness, and steadiness to the frame, I incline the sides from top to bottom in continuous straight lines, so that whatever strains are put upon the frame through the movements of the sash are transmitted directly to the sills or bed upon which the frame is mounted without any tendency to rack or spring the frame. 13 y giving the frame its ordinary width at top and spreading it from top to bottom I am enabled to get a considerable spread at the base without throwing the sides materially out of perpendicular, and this spread is sufficient to give room for the flywheel, as mentioned. Metal frames of this general character are usually made with each side in two partsone above the other-the line of division being at or about the line of the floor on which the log-carriage travels.- Hitherto the lower or base section has been made with a forked upper end and narrow horizontal bearing-faces, and the upper section has been formed with a depending portion to enter between the forks at the upper end of the base-frame, and with narrow bearing-faces to rest upon those of the base-section. In practice such base-frames have generally been divided vertically through the mid dle to facilitate casting, and have been flanged and bolted together. Such construction is not sufficiently firmand unyielding to withstand properly the severe strains to which such frames are inevitably subjected; hence I construct my base and upper sections each with a bearing-face extending across its whole width from front to rear, offsetting thebearing-faces to pass the fork or opening, which is retained as a desirable feature of construction.

Referring again to the drawings, the above construction will be more explicitly set out.

A represents one of; the side frames as a whole, of which there are two, each consisting and an upper section, b.

per end, as shown,- but instead of making the forks entirely independent of each other, and leaving the space between them completely open, a rib or flange is carried across from one to the other, so as to form a continuous horizontal bearing-face for the foot of the upper TOO section to rest upon. The flange or face 0 is cut away about one-half its width across the opening between the two forks of base-section a, to permit a depending portion, (7, of the upper section, b, to enter between said forks, as shown. The upper section, I), also has a continuous face or flange, 0, from front to rear. Thus I am enabled not only to secure a continuous and unbroken bearing or supporting face from front to rear of each side frame, but I also retain the depending portion of the upper section and carry it between and bolt it to the base-section, as heretofore, thus getting a firm support and connection, and securing a degree of strength and rigidity equal to that of a continuous casting,whieh it is difficult to make of the required size. This is of great importance in gang-saw mills,which are required to withstand severe strains, and must therefore be as rigid and unyielding as possible. The side frames, A, are connected by a cap or head section, B, firmly bolted to each, and by suitable tie-rods or braces, C. These side frames are made gradually narrower toward their upper ends, and are spread apart or separated more at the foot of the frame than at the top, the inclination of the sides being uniform from top to bottom, as shown, or, in other words, two straight-faced frames, A, are connected by suitable ties or braces and have their upper ends placed a given distance apart, and this distance is regularly increased from the top to the foot. Parallel vertical bearingfaces f are formed on the inner faces of the side frames, A, near their upper ends, and like bearing or rubbing faces g are or may be formed at or about the line of the log-carriage floor; or a single set of bearing faces may be made at an intermediate height to receive and support the face of the swinging guides in which the sash is carried. A continuous vertical bearing-face may obviously be made on the inner faces of the side frames, but the plan indicated is preferred.

By spreading the frame from top to bottom and continuing the sides each in a straight line above and below the log-carriage floor, the frame, as a whole, is perfectly braced against swaying laterally under the strain of the sash, and each side frame is caused to transmit the strains put upon it directly to the sill or foundation without lateral strain or tendency to bend or give at any point between the upper and lower ends. The great rigidity thus secured renders this frame very desirable, and overcomes the one objection hitherto found against metal frames. An incidental but important result attained by this construction is that the fly-wheel D of the main driving-shaft E can now be placed between the sill F, on

which the side frame, A, rests, and the pillow-block G, in which the main driving-shaft E is carried, still permitting the crank-wheel I to occupy its required position, as shown in Fig. 2. This placing of the fly-wheel (which is independent of the crank-wheel or disk) within the frame, instead of outside, not only renders the apparatus more compact, thereby permitting a larger number of gangs to be set in a given space, but it also covers in and guards said wheel, so that it is less liable to be encountered by persons moving about the mill; and, finally, it brings the fly-wheel close to the pillowbloek, in which the shaft rotates, thus materially adding to the steadiness and firmness of support, and lessening vibration, and consequent wear and noise.

This improved frame has already proven its great superiority in practice, and is rapidly being adopted to the exclusion of frames such as I have mentioned as having been heretofore constructed. 7

Having thus described my invention, what I claim is- 1. A gang-saw frame consisting of two side frames, A A. connected by cross-tics or braces, and having a regular and continuous spread from top to bottom, substantially as shown, whereby strains are transmitted directly to the sills and lateral strains are avoided.

2. In a saw-mill frame, a side frame consisting of base-section a, having recessed upper end and continuous flange or bearing-face c, and upper section, 0, formed with depending portion (1 and bearing face or flange c, said parts being bolted or fastened together, substantially as shown and described.

3. In combination with a gang-saw frame, composed of inclined sides A A and cross'ties or braces, a driving-shaft having the crankpin of its crank-wheel I exactly midway between the side frames, a pillow-block sup porting the inner end of said shaft, sills supporting the sides A A, and fly-wheel D, mounted upon the shaft wit-11in the frame at a point between the pillow-block and sill, as shown and described.

4. A gang-saw frame having its side frames spread farther apart at the base than at the top, and extending in straight lines from top to bottom.

5. In a gang-saw-mill frame, side framcs,A, inclined outward from top to bottom, and provided with vertical bearing-faces on their inner sides, for the purpose explained.

THEODORE S. \VILKIN.

Witnesses:

VAL \V. ALLIs, THEODORE F. \VAMBOLD.

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