USRE2872E - Improvement in head-blocks for saw-mills - Google Patents

Description

Y l UNITED STATES PATENT OFFICE..

DENNIS LANE, or MONTPELIER, vEEMoNT.

IMPROVEMENT IN HEAD-'BLOCKS FOR SAW-MILLS.

Specification forming part of Letters Patent No. 1,770,1laied July 9, lfil; Reissue No.

- February 18, ISGS.

Tol all whom, t may concern:

Be it known that I, DENNis LANE, now of Montpelier, but formerlyof Plainfield, in the county of Vashington and State of Vermont, have invented a new and Improved Log-Setting Device for Saw-Mills; and I do declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure l is a side View of my invention,- Fig. 2, atransverse vertical section of the same, taken on line .r x of Fig. l; and Fig. 3, a plan or top view of the same.

Similar letters of reference indicate like parts. i.

The object of this invention is `to obtain a means for setting the carriages of saw-mills which will admit of a single attendant adjustingy the log to the saw and also operating the brakes for feeding1 and gigging back the carriage.

lhe invention also has for its object the ready adapting of the parts for adjusting the log to saw-boards of different thicknesses, as hereinafter described.

It is further designed to provide the slide or bar of the carriage, by means of which the log is setup upon the carriage to the saw, with a seriesr of bearing-points or rests at suitable distances apart, that are sufficiently projected therefrom to accommodate whatever knots or other irregularities or protuberances there may bein the log, and also sufficiently extended above the said setting-up bar or slide'to the carriage for affording the necessary side restl or bearing for any thickness of log, however much in excess of the thickness of the bar or slide, these side bearings` or rests for the logs being of suiicient number to afford the side support desired to the log, whether long or short; and the invention also has for its obj ect the. providing of the setting-up bar or slide of the carriage witha dog or'dogs, for so securing alog or logs or plank to the carriage while being split or edged that, while not entering the wood, or, if at all, not to such an extent as to impair or injure the same, the logs or plank will be firmly held from being sprung or tipped by the action of the saw, which with the common dogs heretofore used is likely to and does occur, whether the said logs or plank are pro- 2,872. (man jected more or less over the end of the headblocks or cross-trees of the carriage on which the setting-up bar or slide moves; and this invention has for its object to provide one or more of the side rests or bearings of the setting-up bar or slide to the carriage for the log with such means or devices as will enable one or more of the said side bearings to be thrown out either more or less from the setting-up slide or bar, according as it maybe desired or found necessary for the proper adjustment of a log on the carriage for being sawed; and, finally, this invention consists in providing the carriage with a connection between the devices thereof for setting up the log and a stationary incline upon the floor or other stationary part of the mill, that as the carriage moves the setting-up devices will be automatically operated.

A represents the log-carriage of a saw-mill; B B, the ways orv guides on which it is placed and allowed to work freely. The carriage A yis formed of two parallel bars, a. a, connected by cross-ties b b.

C is the setting-up bar or slide, made of wood or other suitable material,and .placed on the cross-bars I) b parallel, or nearly so, with the bars c a.. Thisbar C is allowed to work freely on the cross-ties b b, and it is kept in position by gui-des c c. (Shown in Fig. l.)

To the bar C two racks, D D, are attached at right angles. These racks pass through guides d d, which are at the upper parts of the bearings E E of a shaft, F, which shaft has a pinionfG, at each end, ,the pinions gearing' into the racks D D. i

On the bar C there are placed the usual dogs,

c c, also screws g g, for securing the log to the bar C, and also uprights A2, at various points of its length, that are projected fromthe edge of the bar, and thus, while forming Vside rests or beams to the log, at the same time accommodate any knots, Ste., in the log placed on ythe carriage along the bar G, and are suiiiciently extended above the bar for any thickness of log, whether more or less, greater than the bar. These uprights A2 are to be slufhcient in number to afford a side support to logs of varying lengths, to prevent the log, when some what thinned or sawed away, from springing while being finished up.

Z Z are dogs arranged to slide up and down upon the posts 7c k of the bar C, which dogs l l are provided for holding down and securing are placed at different distances apartthat is to say, some have more teeth than others, and no two have precisely the same number of teeth. On the shaft F there is also placed a ratchet, L, into which a retaining-pawl, M, catches.

N is a forked lever, which isiitted on the shaft F, the forked end of the lever embracing1 the ratchets, as shown clearly in Figs. l and 3. In the forked part of the lever N there is fitted transversely a rod, O, on which a dog, P, is placed loosely. This dog l? is allowed to slide on rodO, and it may be adjusted so as to engage with any of the ratchet-s H I J K,

I the dog being retained in proper position by means of pins h on the rod O. When the rod O is turned so that the pins h will be at the upper side of the rod, the dog I may be shoved along on the rod, owing to a slot, i, being made in the dog. (See Fig. 2.) The dog P is conV` nected by a spiral spring, Q, witha lever, R, attached to the outer end of the forked lever N. A lever, R', is also attached to the outer end of the forked lever N.

S is a pin or stop attached to the bearing E, adjoining the ratchets. This stop S determines the length. of the inward movement of the lever N.

. From the above description it will be seen that the bar G may be moved laterally on the carriage A by actuating the forked lever N,

the dog I engaging with one of the ratchets H, I, J, or K, and thereby turning the shaft F, the. pinions G of which move the racks D.

This movement offbar C sets the log (shown in f red in Figs. 1 andy 2) to the saw; and the movement of bar C may be varied as desired by setting the dog Pin different ratchets. The greater the numberof teeth in the ratchet the less the movement of the bar C, and vice versa. The log therefore may be sawed into boards of varying thicknesses, as may be required. The

\ dog P may be freed from any of the ratchets u by simply raising the lever P. The bar C may be moved or adjusted backward to its original position at .any time by lifting dog. I?, disengaging pawl M, andl shoving the bar C back. A is a pendant attached to .the lever N, and provided with afriction-roller, d, in itslower end, by which it passes up over an inclined bar or plane, B, as the carriage moves, and thus produces an automatic operation of the setting-up devices through the lever N.

In different lengths of log the position' of the incline B is to be changed.

In the drawings two of the uprights A constituting the side restsv or bearings for the log on the carriage fare Ishown as provided with means by which the projection of such side 'rests beyond the edge of the setting-up bar or slide G can be adjusted according as may be found necessary for the proper adjustment of the log in the carriage to be sawed. This means inthe present instance vconsists of an angular lever, f, hung upon a fulcrum in the uprights A2, and in such a position that by raising or lowering the handle end thereto the opposite end thereof can be made to project either more-or lessfrom the face of the uprights A2, and thus to set off the log on'the carriage therefrom, the said lever being held rin such adjusted position by interlocking it with the proper notch, f of the series of notches f in the uprights A2. l

Having thus described my invention,'what I claim as new, and desire to secure by Letters Patent, is'- l. The employment or use of the ratchets HIJ K, having teeth at different distances apart, in connection with the adjustable dog` P, placed on the rod O, which is provided with retaining-pins h, the ratchets being placed on the shaft F, having pinions G G at its ends, which gear into racks D D, attached to bar C, all being arranged as and for the purpose set. forth.

2. .The bar C, yprovided with supports A2, dogs l Z on iiXed posts 7c k, dogs e e, and levercams j', ywhen the parts are constructed and arranged relatively `with, each other and operated in the manner and for the purposes substantially as described.

The above specification of my invention signed by me this 4th day of October, 1867.

p DnNNis LANE'. `Witnesses rWM. F. MGNAMARA, ALBERT W. BnowN.

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