US721409A - Log-turning mechanism. - Google Patents

Description

No. 721,409. PATBNTBD PEB. 24,1903.' W. M. WILKIN.

LOG TURNING MECHANISM'. APPLIOATION FILED ,mi a, A1902.

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UNITED STATES WILLIAM M. WILKIN, OFV MOBILE, ALABAMA.

L'Loc-TURNING MEcHAN-lsM-,

SPECIFIGATION forming part of Letters PatentvNo. 721,409, dated February 24, 1903.

Application filed May 6, 1902. Serial No. 106,151. (No model.) I

To @ZZ whom it may concern:

Be it known that I, WILLIAM M. WILKIN,

a citizen of the United States, residing at Mobile,in the county of Mobile and State of Alabama, have' invented certain new and useful Improvements in Log-Turning Mechanism; and I-do hereby declare the following to bea full, clear, and exact description of the invention, such as will enable-others skilled in the art to which it appertains to make and it consists, ntcrctlz'a, in providing the mech anism with an auxiliary mechanism which performs the functions of rolling a log from the lower end of the logway upon the sawcarriage and also of forcing the log up against the saw-carriage knees and of holding a partially-turned log while the toothed turningbar is being moved downward to take another hold, so as to complete the turning of the log.

Another feature ofr my invention consists in pivoting the cylinder operating the turning-bar at its base and making the turningbar with an oifset therein,pivoting it to the piston-rod of the actuating-cylinder and to a swinging link, so that as the toothed turningbar moves upward it will automatically move toward the log and press against it with sufficient force to engage its teeth therewith Without shoving the log upward against the carriage-knees, and as it moves downward it will tend -to move back from the log.

Another feature of my invention is the construction of the toothed bar with reversible teeth removably pivoted therein, so that in case of breakage they can be reversed.

These and other features of my invention are hereinafter set forth and described, and illustrated in the accompanying drawings, in which- Figure lis a side view in elevation of a logturning mechanism embodying my invention with sections of a saw-carriage and logway. Fig. 2 is a top or plan View of the same. Fig. 3 is a view of a section of the same looking toward the logway. Fig. 4 is a view, partly in elevation and partly in section, of the upper part of the turning-bar. l

In the construction of the invention illustrated in the drawings the framework A and A', the saw-carriage B, the carriage-knees B', and the logway C are of the usual construcbase-frame A', its valve mechanism d, the

auxiliary cylinder E, mounted on said base, and its valve mechanism e, with the valve connections d and d2, connecting the valve dwith ranoperating-lever, (not shown,) and the conmeeting-rod e', connecting the valve e with an operating-lever, (not shown,) are all substantially the same in construction and operation as are fully shown and described in Letters Patent No. 559,426, granted to me on May 5, 1896, and therefore further description thereof herein is deemed unnecessary.

In the main cylinder D there is the usual piston, (not shown,) with which the piston-rod D connects, and to the upper end of the piston-rod D', I pivot a toothed bar F and also the end of a link G, the other end of which is pivoted to the framework, so that as the piston-rod D moves up and down the end thereof moves in the arc of a circle, the radius of f which is the link G. The toothed bar F, I

make of two fiat bars F F', so that the teeth II, hereinafter described, can be pivoted between them, and the lower end of the toothed bar' is provided With a curve or offset F2 toward the front of the carriage B which brings the vertical portion thereof considerably out of line with the side of the piston D and operates to swing the upper end of the toothed 'bar F toward the carriage B as it is moved upward. The two bars F F', forming the bar F, are secured together `by means of rivets of the lower part of the tooth is sufficient to IOO always return it to its normal position, and in case one of the teeth is broken off the tooth can be reversed in the bar. The operation of the tooth-bar and the teeth therein upon a log or square cant as the bar moves upward is clearly illustrated by dotted lines in Fig. 1.

As an auxiliary to and cooperating with the mechanism hereinbefore described I secure aframe I to a support J upon the framework A directly under the logway C, which frame I embraces the tooth-bar F and is provided at the front end thereof next the carriage B with stops t' t', against which the front edges of the bars F' F' of the tooth-bar F operate to prevent the tooth-bar striking the log-carriage B, and on this frame I at each side of the opening for the tooth-bar F therein I pivot the front end of a swinging arm or lever K, and to the rear end of said lever or arm K, I pivot a link L, the opposite end of which is pivoted to the upper end of a link L', pivoted to the upper end of the piston-rod E' of the auxiliary cylinder E, and to the lower end of the link L and the upper end of the link L', I pivot one end of another link M, the opposite end of which is pivoted to the framework A, so that when the piston-rod E' moves upward the links L, L', and M operate upon the lever or arm K to raise it against a log or squared cant on the ways C and move it against the knees B' of the saw-carriage B, as illustrated by dotted lines in Fig. 1, and hold the log firmly against the knees B' of the carriage B while the tooth-bar is operating thereon to turn it.

From the foregoing description the operation of my invention is so obvious that further description thereof is deemed unnecessary.

Therefore, having described my invention so as to enable others to construct and utilize the same, what I claim as new, and desire to secu re by Letters Patent of the United States, 1s-

1. The combination in a log-turning mechanism of a vertical main cylinder mounted upon a supporting-base pivoted to the lower head thereof, a vertical auxiliary cylinder mounted upon a supporting-base, apiston and piston-rod in said main cylinder, a tooth-bar pivoted to and olfset vertically from the piston-rod, a link pivoted thereto at one end and to the mill-frame at the other, a frame under the logway, through front end of which the tooth-bar operates, an, arm or lever pivoted thereto at its front end at the sides of the tooth-bar passage therein, a link pivoted at one end to the rear end of said arm or level', and at the other end to a link extending to the piston-rod of the auxiliary cylinder, and also to a link pivoted at one end to the millframe, substantially as set forth.

2. In a log-turning mechanism, the combination with a vertically-moving tooth-bar, of a fixed frame, through the front end of which the tooth-bar operates, an arm or lever pivoted to the front end of said frame, a link pivoted at one end to the rear portion of said arm or lever, and at the other to a link extending to the piston-rod of an auxiliary cylinder and also to a link pivoted at one end to the millframe, substantially as set forth.

3. In a log-turning mechanism, the combination of a vertically-moving tooth-bar, and a vertical cylinder and piston operating the same, a fixed frame the front end of which operates as a guide for the tooth-bar, an arm or lever pivoted to the front end of said frame, an auxiliary piston and piston-rod, an extension pivoted to the upper end of said pistonrod, and two links pivoted to the upper end thereof, one of which extends to and is pivoted to said lever, and the other to and is pivoted to the mill-frame, substantially as set forth.

4. The combination in a tooth-bar for logturners, of a bifurcated frame, reversible teeth H pivoted on removable pivots f2 therein, stops f and f' in said bar, a projection h2 on said tooth adapted to engage the stop f', and a projection h' on said tooth adapted to engage the stop f, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM M. WILKIN.

Witnesses:

H. M. STURGEON, F. J. BAssE'rT.

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