US99838A - Improvement in head-block for saw-mills - Google Patents

Description

tltttrtl what j JOHN n. Buscar, or FINDLAY, AND GEORGE Bunker. or BLIFFTON,

t. OHIO.

Letters Patent No. 99,838,

dated 'February l5, 1870.

The Schedule referred to in these Letters'Patent and making part:` of the same.

To all 'whom ttt may concern Y Be it known that we, JOHN H. BURKE, of Findlay, in the county of Hancock, and GnonenBUnKEr, ofluiiton, in the county of Allen, and State of Ohio, have invented a new and improved Head-Block for b'aw-'lills; and we do hereby declare that the followingis a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings making a part of this specification, in which Figure 1 is a top view Figure 2 is a side elevation ;Y

Figure 3 is an end view;

Figure 4 is an under side view in detail of knees ofv head-block, showing arrangement of clamps and pawl.

Figure 5 is also a view in detail, showing particularly the manner of attaching rod to rack.

Like letters in the figures ofthe drawings indicate like parts. i

Our invention has reference to so construct-ing the head-block as that the knee thereof may beset either by hand or by power; and

It cousists- First, of a weighted lever attached to a rod passing through near the end of the head-block, said rod connectingwith the rack by crank-levers in combination with the knee, having clamps so arranged on its under side with the rack and so connecting with a weighted lever above as that the clamps willhe caused by the weight thereof to press against the sides of the rack, so that as the latter' is moved the knee -will be moved also, and thus set tothe sawing of thick vor thin lumber, as may be required, the log being properly fastened to the knee, the said knee heilig properly regulated by pawls engaging with teeth on. the side of head-block so that it cannot bc drawn back by the mot-ion of Ithe rack, and having a lever and pawl so connected and arranged with the. teeth of the rack as that the knee may be moved by the lever to Set one end ofthe log ahead of the other without moving the rack.

Second, of an inclined plate att-ached to the door or base on whichthe head-block is constructed, in combination with the weighted lever attached to the rod as above mentioned, so that, by a series of holes in the side of the head-block, or in a plate attached thereto, next to the end thereof, and a piu inserted in the proper hole, .the weighted lever may be regulated by the pin so that the lever will be carrie-d against the incline of the plate by the movement of the headblock sothat it will be raised as if. by hand, and thus operate the rack and set the knee for sawing thick or thin lumber, as may be required.

We construct our invention as'follows:

the proper manner'to the sliding track B.v

C is the weighted lever, having a forked end with a holethcrein fitting over the rod D, and held thereto h v a set-screw, a, or otherwise. This rod passes through the head-block near the rear endrthereotand through a slot in the rack E, which slot is of suiicient size to allow the rack to move free ofthe rod.

The rack EA is connected with the rod by the cranklevers b b bbeing rigidly attached to the rod and then by a pivot to lever b, which is pivoted to the side of the rack, so that every time the rod is turned bythe lever C, the rack will be caused to move, the rackbeing properly' arranged to slide or move in the end piecesvof the -head-block.

F is theiknee, having tongued sides lttingsutliciently loose in the grooved sides ofthe head-block as to admit of its being freely moved therein, and provided on its undery side with clamps c e, arranged ou each side of the rack and pivoted to the knee, and so connecting with the weighted lever d above as that the weight thereof will keep Athe clamps pressed against the sides of the rack; thus, as the rack is moved by the lever C, the pressure of the clamps will become tightened thereon, and the knee will be necessarily carried forward so that it may be set to any required thickness of lumber to be sawed.

To prevent the knee from being drawn back by the movement of the rack, a pawl, e, with spring and pin, is arranged on the under side of knee, to engage with teeth on the `side of the head-block. This pawl is connected with the lever d by a stout cord or chain,

f, so that to draw the knee back the lever must be raised, which will release the pawl as well as' the clamps.

To move the knee without moving the rack, so as to carry one end of the log aheadof the other, a lever,

G, is pivoted to the rear end of the knee, having a pawl, g, which, engaging with the teeth of the rack,

serves as a fulcrum for the lever to act upon irrimpellihg the knee forward.

H is the inclined plate hinged in al suitable manner to the 'floor h on which the track is constructed.

I is an upright plate attached to the side ofthe head-block next to the end thereof, and having a projection, t, at the-- bottom of it, on which the fork of lever C rest-s. This plate is provided with one or .more holes, and a pin, k, to be inserted in the proper hole for regulating the action of the lever C on the rack in setting the knee.

lUur invention isloperated as follows:

The knee sets or adjusts the log, which is properly fastened to it, to the desired thickness of lumber to be sawetl by raising the lever C to the propcheghgw which causes the rod, by means of the crank-levers, to imp`el the rack forward, the motion of which 'causes the clamps o c to embrace either side of the rack tightly, and hence movel and set the knee. To set the knee hy power, this is accomplished by raising the inclinedplate H to can upright position, which, when operating the leverfG'by hand, is laid down on the floor. This plate raises the lever to the proper height by the motion of the head-block, which causes the fork ofthe lever to strike the loweredge of the incline and ascend thereon until it is raised up to the horizontal projection of the incline, when the fork of the lever leaves it, and the plate is then turned to one side or laid down on thel Hoor, so as to be out of the Way on the return motion of the head-block. The distance `the lever is thus raised of course depends'upon the angle of inclination and the extent of it between the upperand lower edges of plate, but whatever it is, the

knee will be moved a distance corresponding with that made by lever, estimated vertically between two parallel lines drawn horizontally from the upper and lower points of the incline.

Now, to set or gauge the knee to the thickness desired, the holes in the plate I will give this, which will be so arranged that 'by placing the pin 7c in a certain hole a certain thickness will be given thuf, by inserting the pin in a hole above the projection 'i and underthe fork of the\lever C, the fork resting on the pin, the lever will strike above the lower edge of the incline, and by removing pin and placing it in a hole still higher np, lever wil1\strike further above on the incline, and so on, so that the distance which the lever is raised or lowered may be so regulated by the pin as that the knee may be set tothe sawing of thick or thin lumber, as may be required.

Having thuslfully described my invention,

What I claim therein as new, and desire to secure by Letters Patent, is-

1. The knee F provided with the weighted lever d,

Witnesses:

CHARLES S. BANN, J Aeon. F. BURKET.

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