US889677A - Pawl-lift for sawmill set-works. - Google Patents

Description

No. 889,677. PATENTED JUNE 2, 1908.

M. HARRIS.

PAWL LIFT FOR SAWMILL SET WO RKS. APPLIUATION FILED SEPT. 30,1907- UNITED STATES PATENT OFFICE.

MONT HARRIS, OF COPPER VALLEY, VIRGINIA, ASSIGNOR OF ONE-HALF TO HENRY R. KIPPS, OF OIIRISTIANSBURG, VIRGINIA.

PAWL-LIFT FOR-SAWMILL SET-WORKS.

Specification of Letters Patent.

Patented June 2, 1908.

To all whom it may concern:

Be it known that I, MONT HARRIS, a citizen of the United States, residing at Copper Valley, in the county of Floyd and State of Virginia, have invented certain new and useful Improvements in Pawl-Lifts for Sawmill Set-Works, of which the following is a specification.

This invention relates to sawmills, and pertains especially to a device adapted to be a plied to any of the well known set-works of such mills for affecting a quick receding movement of the set-works.

The object of the invention is to provide a device adapted to be applied and adjusted to sawmill set-works, and operated in connection with a ratchet-pawl to lift an actuating-pawl and a set of stop-pawls simultaneously so as to free the ratchet-wheel and permit a quick return or receding movement of the set-works.

A further object of the invention is to provide, in sawmill set-works, novel and peculiar means controlled by a spring to operate an actuating-pawl and a set of stop-pawls relative to a ratchet wheel simultaneously, whereby the ratchet-wheel is left free for the movement of the sawmill set-works.

A still further object of the invention is to provide, in sawmill set-works, a peculiar combination of links and levers controlled by a spring to permit an actuating-pawl and a set of stop-pawls to engage a ratchetwheel, and said spring adapted to be compressed to disengage all of said pawls with said wheel simultaneously.

A still further object of the invention is to provide, in sawmill set-works, a spring controlled lever to operate a set of stop-pawls, and a series of links and levers connected together and with said lever and to another lever to operate an actuating-pawl simultaneously with the stop-pawls.

Various other objects, advantages and .improved results will be found attainable in and by the special construction, arrangement and operation of the several parts hereinafter to be more fully described and set up in the claims to follow:

In the accompanying drawings forming part of this application: Figure 1 is a top view of a portion of a sawmill showing the application of 'the invention. Fig. 2 is a detail elevation showing the crank engaging the actuating-pawl. Fig. 3 is an elevation looking at .the side of the ratchet-wheel and showing the device forming the subject matter of this invention. Fig. 4 is a detail perspective view of one of the links. is a detail perspective view of the crank.

The same numerals denote the same arts throughout the several views of the rawings.

The journal-bearing 1, for the shaft 2, is mounted as usual on a sawmill carriage 3, by means of a plate3 and the carriage has ordinary receding mechanism 4, mounted thereon and operated by a suitable handlever 5 to turn the shaft 2, which operates ordinary head-blocks or knees not shown. The yoke 6, ratchet-wheel 7, hand-lever 8, actuating-pawl 9, stop-pawls 10 and other parts of the set-works, are of the usual well known construction and arrangement relative to the shaft 2.

The subject of this invention comprises means for lifting the actuating-pawl 9 and the stop-pawls 10 out of engagement with the ratchet-wheel simultaneously, and consists of a lever 11 pivoted at 12 and having its free end engaging the stop-pawls 10, a lever 13 pivoted centrally at 14, to an anglebracket 15 secured to the plate 3*, a link 16 pivoted to said lever 18, and to the other end of the lever 11, a link 17 (hereinafter more particularly described) pivoted to the lever 13, and to an arm 18, of a crank 19 which engages the actuating-(pawl 9 to lift it, a spiral spring 20 interpose between the frame or yoke 6 and the lever 11, preferably at or near the pivot-point of this lever and the link 16, and a rod 21, for o erating these various levers and links. T e arm 18 is fixed at one end of the crank 19, and the latter extends through the yoke 6, and has a collar 22, so

that its free end works under the actuatingpawl to lift it. The link 17 has a central oiiset 23, which spans the shaft-bearing 1, a depending pintle 24, at one end of the link 13, and a lateral pivot projection 25 at the other end of the arm 18. The link 13, may have two or more pintle-holes 26 therein for the purpose of adjusting the link 17 to vary the throw of the crank as may be desired or as occasion may demand.

It is obvious (all of the pawls engaging the ratchet-wheel) that the rod 21 being pushed, the spring is compressed and the various Fig. 5

connected levers and links are thereby automatically operated to effect such movement as Will lift all the awls out of engagement with the ratchet-w eel simultaneously, leaving the latter free to be turned with the shaft by the receder device. It will be seen that this device is operated solely by the rod 21 to lift the pawls, that when pressure on the rod 21 is removed the spring re-sets the pawls. Thus affording means for permitting an operator to have both hands free to operate the receder while he holds all the pawls lifted by foot pressure on the rod 21.

It is obvious that various mechanical changes may be made in the several parts,

- and their location and connection varied in practical application thereof without departing from the spirit of the invention.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is. ,),1'11. In sawmill set-works, a ratchet-wheel, an actuating-pawl, stop-pawls, and a device for lifting all of the pawls from saidwheel simultaneously, comprising a lever engaging the stop-pawls, a crank engaging the actuating-pawl, links and levers pivoted together and pivotally connecting the crank with the said pawl-lever, a spiral spring expanding against the pawl-lever, and a push rod for compressing the spring.

2. An attachment for sawmill set-works comprising a ratchet-wheel, an actuatingpaw stop-pawls, a crank journaled in the yoke of the set-works and engaging the actuating awl, a spring-controlled lever engaging tie stop-pawls, a lever pivoted centrally and having one end connected with said pawl-lever, connections between the other end of said pivoted lever and the said crank, and means for operating the said pawllever and the crank simultaneously.

3. An attachment for sawmill set-works comprising a ratchet-wheel, an actuatingpawl, stop-pawls, a yoke, a crank ournaled 1n the yoke to lift the actuating-pawl, a lever to lift the stop-pawls, a lever pivoted centrally and connected to the said stop-pawllever, connections between the centrally pivoted lever and the crank, a spring inter osed between the yoke and the stop-pawlever, and a push-rod for operating the spring whereby all the pawls are lifted simultaneously.

4. In sawmill set-works, the combination, with a ratchet-wheel, its actuating-pawl, and its stop-pawls, of means for lifting all of the pawls out of engagement with the wheel simultaneously, comprising a crank engaging the actuating-pawl, an arm to which said crank is fixed, a lever engaging the stoppawls, a lever pivoted centrally, a link pivotally connecting this lever with the said pawlengagingdever, a link pivotally connecting the said arm with the said pivoted lever, a spring expanding against the pawl-lever, and a push-rod for compressing the spring.

5. In sawmill set-works, the combination, with a ratchet-wheel, an actuating-pawl, and stop-pawls, of means for operating all of said pawls simultaneously, comprising a springcontrolled lever, a ivoted lever connected to the spring-contro led lever, a crank having an arm secured thereto, a link having a central set-off and pivotally connecting the said pivoted lever and the said arm, and a suitable ush-rod for operating the spring-controlled ever and the crank simultaneously.

6. The combination, with a ratchet-wl'ieel,

an actuating-pawl, stop-pawls, a shaft upon which the wheel is mounted, a yoke spanning the shaft, and an angle-bracket secured adj acent the yoke and the shaft, of-a crank extending through the yoke above the shaft and engaging the actuating-pawl, an arm fixed to and depending from the crank, a lever pivoted forward of the shaft and engaging the stoppawls, a lever pivoted centrally and connected to the pawl-engaging lever, a link spanning the shaft and connecting the said centrally-pivoted lever with the said arm, a spring having one end attached to said pawl-engaging lever and the other end suitably anchored, and a rod projecting from one of said levers and adapted to be pushed to com ress the sprin for operating all of said paw s simultaneously.

In witness whereof I hereunto set my hand in the presence of two witnesses.

MONT HARRIS \Vitnesses:

R. M. CHARLTON, W. K. FAGG.

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