US292271A - Saw-mill set-works - Google Patents

Description

(No Model.) 3 SheetsSheet :2.

T. S. WI'LKIN.

SAW MILL s31: WORKS. N0. 292,271. Pa,tent' ed J zz; 1884.-

WITNESSES w w S 4' Attorneys.

SAW MiLL SET WORKS.

- 110,292,271. Pat nted Jan. 22, 1884-.

Jul/E 09:

WITNESSES .06,

' PATENT FFl CE,

THEODORE S, WILKIN, OF MILWAUKEE, WISCONSIN.

SAW-MILL SET-weeks.

SPECIFICATION forming part of Letters Patent No. 292,271, dated January 22, 1884. r Application filed November 16,1883. (No model.)

icy aZZ whom/it may concern:

Be 1t known that'l, THEODORE S. WILKIN,

of Milwaukee, in the county of Milwaukee and State oflVis'consin, have invented certain Improvements in Saw-Mill Set-WVo-rks, of which thefollowihg is a specification.

My invention relatesto saw-millset-works,

and particularly to the ratchet mechanism employed for advancing the knees'on the head blocks, and to the brake.

features and detailsphereinafter' fully ex plained.

In mechanism of this character it has hitherto been'customary to employa ratchet-wheel having teeth on its circumference, and to provide a, series of dogs or pawls, each a little longer than the next, to insure a prompt en'- gagement when the op crating-lever was moved Under such construction only one pawl could be in engagement with the ratchet-teeth at any time, and notwithstanding the number of pawls used, and the consequently short movement required to cause one of the series to engage with a tooth of the ratchet, that movement was sufficient, especially after use andeonsequent wear of the mechanism, to permit vthe pawl'or dog to strike with some force against the tooth. This action repeated constantly cuts out the teeth with great rapidity, the

pawls being of tempered steel and acting in much the same manner as cold-Qchisels. This cutting out of the teeth is avery serious trouble, interfering .with the efficient operation of thep'arts and necessitating frequent repair or renewal of the'ratchet, and of course involving verse section through the same; 4, a perspective view of the ratchet mechanism.

A indicates the carriage as a whole; B, the

head-blocks; O, the knees, and D the ratchetwheel, which is, as usual, mounted upon a horizontalshaft, E, which carries the pinions for moving the knees G. It'is to this ratchetwheel and the parts operating thereon that this invention mainly relates.

* The side faces of the wheel D are formed with radial ratchet-teeth a, extending from the I circumference or outer edge inward, in practice about'threeinches, the wheel being about eighteen to twenty inches in diameter ordinarily, though of course the size and proportions maybe varied to any desired extent.

The wheel D is rigidly secured upon shaft E,

ing faces of the teeth of thewheel, as will be readily understood upon referring to the drawings. The ratchet-wheel D is made to turn in the direction indicated by arrow, and treating that as the forward direction, the rear faces of theteeth a are perpendicular to the side faces of the wheel, while the forward faces of the teeth d are thus perpendicular to the side faces of the disks 1*. The disks F are each pressed toward and held in contact with wheel D by a spiral spring, G, bearing at one end against the face of the disk, coiled;about the hub 0 thereof, and bearing at its outer end against a collar, H, secured rigidly upon the shaft B. Each disk is thus made to lock with the ratchet-whee the teeth of one engaging with the teeth of he other, but the elasticity of the springs G allowing the beveled faces of the teeth to ride over each other when the disks are-rotated backward. In this way the disks are caused to impart motion to the ratchetwheel when turned forward, but have no effeet thereon when moved backward. In order to make the rotation of the wheel continuous, I employ the double-action arrangement common to such machinerythat is to say, the two disks are respectively connected by links of to arms 9 71, extending radially in opposite directions from a rock-shaft, I, provided with a hand-lever J as shown in Figs. 2 and 4, so that upon moving the hand-lever in either direction one of the disks F is turned forward and the other is at the same time turned backward, the forwardly-moving disk engaging with the ratchet-wheel and causing it also to rotate in a forward direction, and the other disk moving backward to take a new hold pre paratory to its forward rotation and movement of the disk. Thus bysimply moving the hand-lever J back and forth a continuous rotary movementin one direction is imparted to the wheel D. hen it is desired to withdraw or run the knees back upon the head-block, it is necessary to disconnect the disks from the ratchet-wheel D, and for this purpose two links, K, are employed, each formed with an elongated eye, 2', to pass around the shaft E and permit the links to move endwise, the inner ends of the links being formed with beveled or inclined faces j, which ride upon the inclined faces of the hub b of the ratchetwheel D, thereby forcing outward the links K, and with them the disks F, which latter are pressed against the links by the springs G. \Vhen the links are drawn outward or downward, when arranged as shown in the drawings, the disksare forced away from the ratchet-wheel and out of engagement therewith, as will be readily understood, leaving the wheel and its shaft free to rotate backward. By again moving the links inward their wedgeshaped or beveled ends are caused to ride off the ends or faces of hub I), and the disks are again permitted to come into engagement with the wheel D. The links K are connected by pivots to elbow-levers M, which are bolted or made fast to a common handle or lever, N, Figs. 1 and I.

In order to make room for the links, the disks are preferably cut away through a part of their circumference slightly exceeding their rotary movement; but, if desired, the circumference may be left unbroken and the links bent outward through slots or openings made through the faces of the disks, concentric with shaft 11 and of such width in a radial direction to permit the necessary play in forcing the disks outward or permitting them to return.

In machinery of this description it is customary to provide the shaft E with a brake-wheel, to receive a brake or friction band, which is applied mainly to retard or stop the backward motion of the knees, but is also serviceable in controlling the apparatus generally. A special brake-wheel has always been provided heretofore; but under my construction I am enabled .to dispense with such special wheel and to ap- 1, 2, 3, and 4. The arrangement of this brakeband will remain in all respects unchanged, except that, as above mentioned, it is applied directly to the ratchet-wheel, instead of to a special brake-wheel, one end being made fast to the carriage-frame or other suitable body and the other end connected with an operating-lever, 0. By this arrangement I am enabled to save a considerable amount of room on the carriage and to bring the brake-lever within easy reach of the attendant operating the ratchet mechanism, besides effecting some saving in cost of construction.

The apparatus, constructed as herein described and shown, is free from the difficulties and objections mentioned as incident to the ordinary construction, the entire series of teeth in one or the other disk engaging simultaneously with those of the ratchet-wheel, and consequently distributing the concussive force incident to the engagement of the teeth over the whole series of teeth, instead of throwing it entirely upon a single tooth. The same principle of construction may in some cases be applied to single-acting ratchet mechanism by omitting one disk and its attendant parts.

It is obvious that the means for oscillating the disk or disks may be modified, and that, if desired, the operating levers or handles may be applied directly thereto, the only essential requisite being that some means be supplied for oscillating the disks.

It is also obvious that instead of an encircling brake-band a brake-shoe may be applied to the circumference of wheel D.

Ratchet-teeth have before been made upon the side face of a wheel, and single-toothed pawls have been combined therewith to give motion to the wheel, such construction having been adopted for the purpose of permitting gear-teeth to be used on the periphery of the wheel.

I do not claim, broadly, a wheel having ratchet-teeth on its side face or faces, and a single-tooth pawl or pawls arranged to engage therewith, such construction being open to the same objections as to wear that I have set forth in regard to wheels having the peripheral ratchet-teeth.

Having thus described myinvention, whatI claim is 1. In a ratchet mechanism for producing rotary motion, the combination of a wheel having ratchet-teeth on its side face, and an oscillatory disk adapted to be moved to and from said side face, and provided with a series of ratchet-teeth to engage with those of the wheel.

2. In aratchet mechanism for imparting romoved in a forward direction, and the disk is permitted to disengage itself from andm'ove back independently of the wheel when operated in a backward direction. 1

3, In a ratchet mechanism for imparting r0; tary motion, th'ecombination of a wheelhaving ratchet-teeth on its side face, a disk adapted and arranged to move to and from said face, and provided with similar teeth, a spring bearing against the disk andserving to urge it into contact with the ratchet-wheel, and a beveled or wedge-shaped bar, arranged, substantially as shown, to enterbetween the disk and wheel to separate their faces. 7

4. The herein-described ratchet mechanism for producing rotary motion, consisting of wheel D, having ratchet-teeth on its side faces, disks F'F, likewise provided with teeth on their inner faces, springs G, rock-shaft I, having arms g h, and links 6 f, connecting the disks with said arms, substantially as shown and described.

5. In combination with shaft E, ratchetwheel D, having teeth on its side faces, disks F F, mounted loosely upon said shaft and furnished with teeth to engage with those of the ratchet-wheel, means, substantially such as shown and described, for simultaneously moving the disks in reverse directions, springs G, bearing against the disks and serving to press them toward the wheel D, links K, having elongated openings i and beveled faces j, and encircling the shaft E between the wheel D and disks F, and a hand-lever, N, connected with the links, substantially as set forth.

6. The combination,substantially as shown and described, of shaft E, ratchet-whecl D, secured rigidly upon said shaft, ratchet-disk F, mounted loosely upon the shaft, a hand-lever connected with said disk, collarH, and spring G, bearing at one end against the disk and at the other end against the collar, as and for the purpose explained.

7. The combination, substantially as set forth, of shaft E, ratchet-wheel D, firmly secured thereon, and provided with a hub having a beveled end face, ratchet-disk F, spring G, serving to press the disk against the wheel, and slotted link K, having beveled face j, arranged, substantially as shown, to ride upon the beveled end of the hub of the wheel and .to separate the disk and wheel.

'8. In combination with ratchet wheel D, having teeth on its side face, and with link or bar K, having beveled face j, arranged, substantially as shown, to bear against the hub of the ratchet-wheel, disk F, provided with teeth to engage with those of the wheel, and cut away, substantially as described and shown, to give room for the link or bar K.

' 9. In combination with a ratchet-wheel having teeth on its side face, and an oscillatory toothed disk adapted to impart rotary motion to said wheel, abrake-band applied to the circumference of the wheel and provided with an operating-lever, substantially as shown and described.

10. In combination with shaft E and ratchet wheel D, s'ecure'd thereon, disks F F, springs G G, and collars H, rockshaft I, provided with arms 9 h,'and hand-lever J links 0 f, connecting the arms 9 h with the disks, brake-band L, and brake-lever 0, all substantially as shown.

THEODORE S. WILKIN.

'Witnesses:

WM. WrALLIS, THEODORE F. WAMBOLID.

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