Improvement in log-turners for saw-mills

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  • Publication Date: April 14, 1874
  • Publication Number: US-149649-A



` 2 Sheets--Sheet 2. L. P. GILBERT. Log-Turners for Saw-Mills. Patented Apri 14,1874. . zufan l 6?'- l l/ UNITED i STATES PATENT OFFICE, LEVI P. GILBER'L'OF FORT ATKINSON, WISCONSIN. - IMPROVEMENT IN LOG-TURNERS FOR SAW-MILLS. `Specification forming part of LettersPatent No. 149,649, dated April 14, 1874; application filed March 2l, 1874. To all whom, it may concern: Be it known that I, LEVI P. GILBERT, of Fort Atkinson, county of Jefferson and State of Wisconsin, have invented a new and useful Improvement in Log-Turners for Saw-Mills; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings making part of this specication, in whichy Figure l is a vertical longitudinal section of my log-turner. The full black lines show the parts in position for a log or cant tobe passed up to the knees upon the log-carriage, and the dotted lines show the parts in position ready to begin the operation of turning the log or cant. Fig. 2 is a front-end elevation of the machine. Fig. 3, Plate 2, is a perspective view of the machine, the parts being in the position shown by dotted lines in Fig. l. The nature of my invention consists in a system of levers, cranks, windlass, and reversinggearing, as will be hereinafter described,whereby the log or cant is turned as much as desired, and the devices which turned it removed back out ofthe way for the passage of another log or cant over them, and then again are made to aid in forcing a new log against the knees as they are brought into position to be operated to turn the log or cant. In the accompanying drawings, A represents a frame, on which the log-carriage B is constructed. O C are the knees of the carriage. D D are two separated hangers, suspended from the side beams of the frame, so as to be below the top thereof. E E are two vibrating beams, hung between the hangers upon a pin, c. To the rear ends of these beams two levers, F F', are pivoted. These levers are bent at the.point where they begin to rise above the log-carriage, so as to form an angle at b; and from this angle upward they are furnished on Vtheir back edge with ratchet-shaped teeth c; but in a full-sized machine those teeth will be much longer, and may be some inches apart. Thus constructed, the toothed edges of the levers form an angle with the log which they are to turn when brought up to the same, as shown in the drawings. By this means the log is turned without crowding but slightly against the knees. These levers are pivoted I is a windlass-shaft arranged below the crankshaft. rfhis shaft has a parting-collar, e, at its middle, and from the sides of this collar chains J J lead, and connect with rings of doubled chains K K. The chain K is connected to the ends of the two levers F F below its fulcrum, and the chain K is connected to the said levers above its fulcrum, at points a little below the angle of said levers, as shown. L is an intermediate gear-shaft, with friction-pulley M on its end, which stands loosely between two pulleys, N O, on the crank and windlass shafts. P is a shaft, with a friction-pulley on one of its ends and a grooved pulley on the other end. The grooved pulley of this shaft is geared to a grooved pulley on the intermediate shaft L by a crossed belt, Q. rDhese pulleys may be without grooves, and they maybe tooth-geared. The friction-pulley occupies a place under the pulley O. The shafts L and P are free to rise and fall slightly at those ends on which the friction-pulleys are placed; and to these loose ends the short ends of angular hand-levers R S are fastened, respectively, as represented. On the end of the intermediate shaft L a handcrank is represented; but, in practice, this shaft will be geared with the driving-power of the mill. 'Io operate the machine described, place the square block I, which represents a log after it has been squared or made into a cant, on the top of the frame and against the knees then place the right hand upon the crank, and with the left hand push the lever It backward, so as to bring the pulley of shaft l? in gear with pulley of shaft I. Now, by turning the crank the chains will draw down the lower or rear ends of the levers F F', and cause their upper or forward ends to move from the position shown in black lines in Fig. 1 to the position shown in dotted lines in same figure. Now, by releasing lever It and pressing back upon lever S, so as to throw the shaft L in gear with crankshaft, and continuing to turn the crank, the levers will be caused to alternately bite and move against the corner of the log, and, in so doing, will raise this corner of the log, and as fast as the corner of the log is raised by one lever the log is prevented from falling by the other lever' biting upon it and continuing the turning movement of the log. The log being turned as much as desired, the levers F F can be brought back out of the Way by pulling the lever S forward, so as to cause shaft L to gear with windlass-shaft, and continuing to turn the crank. The latter adjustment reverses the motion of the windlass-shaft, and causes the chain to draw upon the upper ends of the levers, and thereby move them overV out of the way, or tothe position shown in full black lines in Fig. l, which is below the log-carriage. The operation of the machine is such that it will keep the log turning as long as wanted; and it will turn a log three feet and a half in diameter clear round in less than iive seconds, which is much quicker than by ordinary approved modes. The machine can be stopped at any point, and it will hold the 10g firmly against the knees while it is being dogged 0r examined by the Sawyer, which is a very important thing to secure. The arrangement for getting the levers out of the Way permits another logto be rolled up near the carriage, in position for being rolled upon the carriage by the contact of the levers. By this means the cant-hook and one man may be dispensed with. Thus a great saving in time and labor is effected. It is evident that a greater number than two levers may be used, and also that the friction-pulleys may be substituted by toothed gearing without chan ging the invention I have made. What I claim as my invention, and desire to secure by Letters Patent, is- 1. The levers F F for turning logs or cants, constructed and operated substantially as herein set forth. 2. The combination of the rocking beams E E', crank-shaft H, the Windlass-shaft I, inter-1 mediate shaft L, and the reversing-pulleys L l? and levers S R, substantially as and for the e purpose Set forth. LEVI P. GILBERT. Witnesses: HENRY OGDEN, A. E. BALnWrN.



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