US973423A

US973423A - Log-turning device.

Info

Publication number: US973423A
Authority: US
Inventors: Virgil T Grabs
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-04-15
Filing date: 1910-04-15
Publication date: 1910-10-18
Anticipated expiration: 1927-10-18

Description

V. 'I'. GRA-BS.

LOG TURNING DEVICE.

APPLIOATIQN TILBD APR. 15, 1910.

973,423, Patented Oct. 18, 1910.

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LOG TURNING DEVICE. APPLIOATION FILED 11111.15, 1910.

973.423. Y Patented 001.1111910.

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VIRGIL T. GRABS, OF KING, NORTH CAROLINA.

LOG-TURNING DEVICE.

To all whom it may concern:

Be it known that I, VIRGIL T. GRABS, a citizen of the United States, residing at King, in the county of Stokes and State of North Carolina, have invented new and useful Improvements in Log-Turning Devices, of which the following is a specification.

This invention relates to a log turning device for saw mills, the object of the invention being to provide a device of this character which is simple of construction, operative to positively turn the logs, and adapted to be conveniently thrown out of operation when its use is not desired.

The invention consists of the features of construction, combination and arrangement of parts hereinafter fully described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a top plan view of a portion of a saw mill frame embodying my invention. Fig. 2 is a vertical transverse section on the line 2-2 of Fig. 1, showing a log in the ope ation of being turned. Fig. 3 is a view similar to Fig. 1, showing a modification in the construction of the log turner. Fig. 4 is a vertical transverse section on the line .L -it of Fig. 3.

Referring particularly to Figs. 1 and 2 of the drawings, 1 designates a saw mill frame, 2 the carriage mounted to travel thereon, and 3 the adjustable knees or abutments against which the rear side of the supported log 4 rests. Journaled in the frame 1 is a transverse drive shaft 5 carrying a pulley 6 for receiving power from a suitable source, and provided at its front and rear ends with bevel gears 7 and 8. The gear 7 meshes with a gear 9 on a transmission shaft 10 journaled longitudinally in bearings at the front of the frame and carrying a spur gear 11. Arranged above the shaft 1() is a rock shaft 12 carrying a loose idler gear 13 meshing with the gear 11 and provided .with bracket arms 14 forming bearing supports for a swinging shaft 15, carrying a gear 16 mesh.- ing with the idler gear 13, whereby said shaft is driven and also carrying smoothsurfaced log-turning rolls 17. A lever 18 is connected with the shaft 12, whereby the la tter may be rocked to swing the shaft 15 toward or from the front of the carriage. By such movement of the shaft 15 the rolls 17 may be brought into contact with the front portion of the log below its center or swung vto the dotted line position shown in Fior. 2

Specification of Letters Patent.

Application filed April 15, 1910.

Patented Oct. 18, 1910.

Serial No. 555,641.

out of engagement with said log. The rolls are revolved inwardly and rearwardly by the gearing, as indicated by the arrows in Fig. 2. Upon the rear of the frame 1 are arranged upwardly extending spaced bracket arms 19 in the lower and upper ends of which are respectively journaled

shafts

20 and 21. The lower shaft 2O is provided at one end with a. beveled gear 22 meshing with the gear S and drives the upper' shaft 21 through sprocket gearing' 23.

Pivotally connected at its rear end to the shaft 21 is a transverse swinging `bracket 24 having front and rear forked ends, said bracket being adapted to be swung upwardly and rearwardly to an inoperative position or downwardly and forwardly over the carriage to an operative position. The free forward end of this bracket carries a-sprocket wheel 25 and is provided with a suitable manipulating handle 26, while upon the shaft 21 between the arms of the rear end of the bracket is keyed a sprocket wheel 27. Between the two sprocket wheels extends an endless chain 2S having its links provided with hooked teeth or projections 29, the upper and lower stretches of the chain extending longitudinally above and below the body of the bracket. As shown, the arms of the rear fork of the bracket are formed with sleeves 30 which loosely engage the shaft 21, and carried by these sleeves are weights 31 which connterbalance the weight of the bracket and the parts carried thereby, thus enabling the bracket to be swung from an inoperative to an operative position, and vice versa, in an easy and convenient manner. It will be observed that the gearing drives the chain 28 so that its lower stretch moves forwardly, and that the hooks 29 face in such direction of movement.

Then the bracket is swung upwardly to an inoperative position, it may be balanced in such position by the counteiweights 31 or supported in any other suitable manner.

In operation when it is desired to turn the log 4 the rolls 17 are swung upwardly into contact with the log and then the bracket is swung downward to cause the teeth 29 upon the front end of the lower stretch of the chain to engage the upper rear surface of the log above its longitudinal center, the rollers 17 engaging the lower front surface of the log below its horizontal center as shown in Fig. 2. As, therefore, the rollers 17 will exert a turning pressure upon the base of the outer side of the log, while the teeth of the lower stretch of the chain will engage the upper portion of the inner sui'- face of the log and force the same outwardly, it will be apparent that the log will be given a more or less complete turn, depending upon the duration or extent of the turning movement.

In the embodiment of my invention disclosed in Figs. 3 and 4, the turning rolls 17 and the same` type of drive gearing are eniployed :as in Figs. l and 2, but instead of the bracket 24 and the endless turning chain 28, ay substantially U-shaped bracket 32 is employed vhaving its arms provided with sleeves, 33 which loosely engage the shaft 2l and carrying counterweight-s 34, the forward portion or cross bar of the bracket being provided `with an operating handle EX- tendiiig longitudinally of said bracket in parallel relation are turning devices 36 each comprising a bar provided at its forward end with downwardly and forwardly projecting log engaging teeth 37. The rear ends of the bars are formed with sleeves 38 which engage cranks 39 arranged at an angle of 18()O on the shaft 2l, while the forward ends of the bars have a loose sliding and pivotal engagement with the cross bars of the bracket through the medium of longitudinal guide members 40. By this construction the toothed bars are adapted to reciprocate alternately in opposite directions in an undulatory path, the toothed portion of each bar being depressed on its forward motion and eleva-ted on its rearward motion, as will be readily understood. Then the biacket 32 is, therefore, swung downward to an operative position, the previously adjusted rolls 17 will engage the lowei' front surface of the log, as hereinbefore described, while the toothed bars on their forward niotion will alternately engage the upper reai surface of the log, whereby the latter will be turned.

Having described the invention, I claim l. In a log turning device, the combination, with a saw-mill frame and carriage, of a drive shaft mounted upon one side 0f the frame and carrying a driving gear, a rock shaft arranged above said driving shaft and carrying an idler meshing with said gear, arms carried by the rock shaft, a third shaft supported by said arms and carrying a gear Vmeshing with said idler, turning rolls supported by the third shaft, means for swinging the rock shaft to force said rolls into and out of engagement with one side ofa log, a cooperating device mounted upon the opposite side of the frame to engage the opposite side of the log, and means for driving the said device and the rolls through said gearing in opposite directions.

2. In a log turning device, the combination, with a saw-mill frame and carriage, of turning rolls mounted upon one side of the carriage, gearing for driving said rolls, a transverse shaft for driving said gearing, al

bracket pivotally mounted for movement in a vertical plane at the opposite side of the frame, a turning device carried by said bracket, and gearing driven by the transverse shaft for operating said turning device. In testimony whereof I affix my signature in presence of two witnesses.

VIR-GIL T. GRABS.

fitnesses S. L. PULLIAM, IJ. K. PULLIAM.