US739046A - Tooth-bar guide and arrester. - Google Patents

Description

No. 739,046. PATENTED-SEPT. 15, 1903. T. S. WILKIN. TOOTH BAR GUIDE AND ARRESTER.

APPLICATION FILED APR. 13, 1903.

N0 MODEL.

UNITED STATES iatented September 1 5, 1903.

PATENT Orrics.

THEODORE S. WILKIN, OF MILWAUKEE, WISCONSIN.

TOOTH-BAR GUID E AND ARRESTER.

SPECIFICATION forming part of Letters Patent No. 739,046, dated September 15, 1903.

Application filed April 13, 1903.

To all whom it may concern:

Be it known that I, THEODORE S. WILKIN,

residing at Milwaukee, in the county of Milnection with the tooth-bar of a log-turner in a sawmill, to guide the movement of the tooth-bar, and to arrest the shock caused to a tooth-bar as heretofore mounted when in its throw laterally it contacted with the end or ends of the floor-plate secured rigidly to the floor of the mill.

My improved device is shown in the draw-- ings in connection with a tooth-bar of the general form and character of that shown in Patent No. 583,560, issued to me on June 1, 1897, though the use of the device will not be confined to a tooth-bar of that specific construction and mode of operation.

The invention consists of the device; its parts and their combinations, as herein described and claimed, or the equivalents thereof.

In the drawings, Figure 1 shows a fragment of the upper portion of a tooth-bar and a member of a floor-plate of a sawmill with my improved device mounted thereon in proper relation to the tooth-bar. 'Fig. 2 is a top plan view of the floor-plate and my improved devices in connection with the upper portion of the log-turner which is shown in cross-secriage travels.

The tooth-bar 2 is the upper portion of an upwardly and downwardly movable logturner, the bar being provided with teeth 3, adapted to engage the log and turn it as the tooth-bar is forced upwardly. In the form of log-turner shown in the'drawings the tooth- SerialNn. 152,298 (No model.)

' bar is supported by a link or ancillary bar 4,

connected to the tooth-bar at its upper end pivotally. The tooth-bar and the ancillary bar are connected in the usual way at their lower ends to means for raising and lowering them and at the same time and to such eX- tent as is desired within the limits of the movement permitted to swing the tooth-bar forward and back. The teeth of the toothbarproject forwardly therefrom in the manner shown in the drawings, and the usual construction of the tooth-bar is a bar made up of two side plates 5 5, between which the teeth 3 are interposed, the teeth being ordi narily pivoted to the plates.

A floor-plate consists of two bed-pieces 6 6,

supported on sills A A and placed complementary to each other on opposite sides and near to the path of the tooth-bar 2 and its link 4. The construction and dispositionof these bed-pieces forming the floor-plate are such as topermit of the forward and back swing of the tooth-bar and its ancillary bar, while preventing the movement sidewise of the bar. For strengthening the construction tie-strips 7 7 are secured to the bed-pieces at the front and at the rear in such manner as to assist in holding the bed-pieces, especially near the top, in permanent position with reference to each other.

at the front and at the rear of the tooth-bar swinging crank-arms 8 8 in pairs, one at each side, the pivot-pins 9 9 of which crank-arms have their bearings revolubly in the bedpieces 6 6 and are held in place therein by bolts 10 10, the bolts being provided with washers or bearing-plates 11 11, that bear against the outer surfaces of the bed-pieces. This construction permits the arms to swing freely forward and back. The arms 8 are provided with wrist-pins 12 12, and preferably antifriction-rollers 13 13 are mounted thereon. These rollers fit against the edges of the side plates 5 5 of the tooth-bar, but do not extend inwardly far enough to contact with the teeth 3. The construction is such that when the tooth-bar is forced upwardly and forwardly or rearwardly the wrist-pins 12 12, by their antifriction-rollers 13 13 bearing against the edges of the side plates 5 5 of the tooth-bar, ride along on the tooth-bar,

and at the same time the arms at that side of the bar toward which it is being swung swing upwardly, and as the arms approach horizontal positions the strain of the tooth-bar thereon in its forward or backward movement becomes steadily less and less a cross strain and more and more a direct strain from the pivots of the arms, whereby the forward or backward movement of the tooth-bar is more and more restrained until the arms come to a horizontal position, when the swing of the tooth-bar is absolutely arrested, the swing of the tooth-bar to that point having been increasingly restrained from the starting of the swinging of the arms more and more until it is finally absolutely arrested, but without shock, such as would occur if the tooth-bar were arrested in its movement by contact with a fixed stop without any previous limiting or arresting action.

What I claim as my invention is- 1. The combination with the tooth-bar of a log-turner, of pivoted suspended laterallyswinging arms, at their free extremities engaging the tooth'bar and adapted to increasingly arrest and ultimately to prevent the movement of the tooth-bar forward orback.

2. In combination, a tooth-bar of a logturner mounted to be raised and lowered and concurrently to swing forward and back, a fixed floor-plate through which the tooth-bar is movable and which plate is adapted to prevent displacement of the tooth-bar laterally, and pivotally suspended and swinging arms at the sides of the tooth-bar, which arms at their free extremities engage the tooth-bar movably and are adapted to increasingly arrest and ultimately to prevent the forward or back motion of the bar.

3. Inasawmill, means forcontrolling movements of a log-turning tooth-bar, comprising a floor-plate, and thereon pivotally-suspended cranked arms adapted to engage movably the tooth-bar and increasingly arrest and ultimately stop the forward or back movement of the bar.

4:. In a sawmill, a log-turning tooth-bar, and pivotally-suspended cranked arms adapted to engage the tooth-bar movably and with yielding swing to increasingly arrest and ultimately to stop the movement of the bar forward or back.

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

THEODORE S. WILKIN.

\Vitnesses:

O. T. BENEDICT, ANNA F. SOHMIDTBAUER.

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