US732649A - Sawmill. - Google Patents

Description

No. 732,649. PATENTED JUNE 30, 1903. H. S. MITCHELL.

SAWMILL.

APPLICATION FILED APR. 13, 1903.

N0 MODEL. 7 I L 2 SHEETS-SHEET 1.

rm: Moms Pncns cn. PHnfo-u'mu, WASNINGTON, n. c.

PATENTED JUNE .30, 1903.

H. s. MITCHELL.

SAWMILL APPLICATION I'ILED APR. 1a, 1903.

2 SHEETS-SHEET 2.

N0 MODEL.

I WMYMu,

ma Nonms PETERS co. Pnorauwo. WASHINGTON, u c.

UNITED STATES iatented June 30, 1903.

PATENT OFFICE.

SAWMILL.

SPECIFICATION forming part of Letters Iatent No. 732,649, dated June 30, 1903.

Application filed April 13 1903.

To all whom it may concern:

Be it known that I, HENRY S. MITCHELL, a citizen of the United States, residing at. Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Sawmills, of which the following is a specification.

My present invention pertains to improvements in sawmills, the construction and advantages of which will be hereinafter set forth, reference being had to the annexed end elevation of the log-deck, the live rollway, and a portion of the carriage; Fig. 3, a vertical sectional view on the line 1 1 of Fig. 1; Figs. 4 and 5, detail views of the bridge arms or members, and Fig. 6 a detail view of the bolt carried by the arm.

The object of the invention is to provide a simple and efficient means for bridging the space above the live 'rollway or lumber-conveyer, which occupies a position between the log deck or skid and the carriage, the arrangement under the present construction being such that the bridge-pieces which are moved into place by the log or cant automatically assume their normal position after the log or cant is removed therefrom and leave the rolls entirely free for the reception of a slab or board. Suitable means will be provided for preventing the bridge-pieces from passing below a predetermined plane at their outer end, or, in other words, they will be held in approximate alinement with the carriage when depressed by a log.

I am aware that devices for bridging over the live rollway have been employed heretofore, but in all of them, so far as I know, positively operated bridge-pieces, connected in one or another way to some operativeportion of the sawmill, have been used. With my invention such connections are unnecessary."

Referring to thedrawings, A designates the carriage, and B the live rolls placed intermediate the carriage and the log deck or skid C, which in the present instance is shown as composed of a series of properly- Serial No. 152,417. (No model.)

i supported timbers D, over which a suitable flooring is laid.

It is to be understood that any form of lumber-conveyer may be employed and that the deck or skidway may be constructed in any approved manner so-long as it comes into approximately the same plane as the carriage upon which the logs or cants are to be placed. I

Any suitable mechanism for advancing the logs upon the deck or skidway maybe used.

emery transfer. This comprises a block E, movable upon tracks or ways F. Said block carries a pivoted arm G, which normally stands as indicated in Fig. 2, with its nose in position to engage and push a log forward.

Block E is fastened to a chain H, to which causing said block to move backward and forward alternatelygand arm G first to move backward under the log or cant, and then after having risen in rear thereof to engage the same and advance it along the deck toward the carriage. Two or more of these devices will be employed, according to the work to be done.

A number of arms or bride-pieces I are pivotally mounted in the skidway at its edge adjacent to the lumber-conveyer' and preferably intermediate the forward ends of timbers D. These arms or bridge-pieces are of such length that they reach approximately to the carriage when they are depressed bya piece of timber. (See Figs. 2 and 3.)

A bolt J is pivotally connected to the rear end of each bridge-piece, and a large washer or disk K-is mounted on the lower end of said bolt, being held securely in place by suitable nuts. Bolt J is of such length that when the arms or bridge-pieces are depressed approxithe washers will come against the under face of timbersD ,thereby forming, in effect,a stop and preventing further depression of the outer ends of the bridge-pieces which then overlie the live rollway. As soon as the log or cant isremoved from the pieces I onto the carriage said pieces will swing into practically a vertical position, owing to the preponmotion is imparted through suitable means,

In Figs. 1 and 2 there is shown the so-called mately to the level of the deck and carriage derance of weight being in rear of the fulcrum or pivot of the bridge-pieces. It will thus be seen that the action of the bridgepieces in moving to the bridging position as the log advances along the deck or skidway and comes into contact therewith, in remaining in such position over the lumber-conveyer until the log is positioned upon the carriage, and in immediately assuming their normal or upright positions and leaving the lumber-conveyer unobstructed is entirely automatic.

It is manifest that all of the arms or pieces I may be mounted upon a common shaft and whether such construction or a single pivot or fulcrum be employed is immaterial. So, too, stop devices other than that above specifically pointed out may be employed for limiting the descent of the arms.

Having thus described my invention, what I claim is 1. In combination with a sawmill-carriage, a log deck orskidway; alumber-conveyer intermediate said carriage and deck; and ase ries of arms pivoted to the deck adjacent to the lumber-conveyer, said arms normally occupying a substantially upright position and capable of being swung down over the lumber-con veyer by a log 01' cant advanced along the skidway.

2. In combination with a sawmill-carriage, a log deck or skidway; a lumber-conveyer intermediate said carriage and skidway; a series of pivoted arms carried by the skidway, said arms normally occupying an upright position, but capable of being swung down over the lumber-conveyer by an advancing log or cant; and means to limit the downward movement of said arms when a log or cant is resting thereon.

In combination with a sawmill-carriage, a log deck or skidway; a lumber-conveyor intermediate said carriage and skidway; a series of arms pivot-ally mounted adjacent to the conveyer, said arms being arranged and adapted to swing down over the conveyer; and means foradvancing a log or cant along the deck, bringing it into contact with the arms and thereby depressing them, whereby a bridge for the log or cant is automatically formed over the conveyer.

4. In combination with a sawmill-carriage, a log deck or skidway; a lumber-conveyer intermediate said carriageandtheskidway; and a series of free arms pivoted upon said skidway, the pivotal point of said arms being such that their outer ends normally will rise clear of the lumber-conveyer and stand in the path ofa log or cant advancing on the skidway.

5. In combination with a sawmill-carriage, a log deck or skidway; a lumber-conveyer intermediate said carriage and skidway; a series of free arms pivoted to the skidway adjacent to the ln mber-con veyer, said arms projecting above the surface of the skidway in the path of travel of an advancing log or cant; and means for limiting the extent of depression of said arms.

6. In combination with a sawmill-carriage, a log deck or skidway; a live rollway intermediate said parts; a series of arms pivoted intermediate the outer ends of the timbers of the way, one portion of each of said arms standing above the deck in the path of an advancing log or cant; means for advancing logs or cants along said deck; a bolt pivoted to the inner end ofeach arm; and a washer carried by said bolt, said washer making contact with the under face of the timbers when the arms are depressed and acting as a stop therefor, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY S. MITCHELL.

Witnesses:

H. B. HUNTLEY, JOHN B. SHoULT.

Images