US101343A - Improvement in saw-mslls - Google Patents

Description

' UNITED STATES PATENT OFFICE.

EMANUEL ANDREWS, OF WILLIAMSPORT, PENNSYLVANIA.

IMPROVEM ENT IN SAW-M l LLS.

Specification forming part of Letters Patent No. 1011343, dated March 29, 1870.

To a/ZZ whom t may concern:

Be it known that I, EMANUEL ANDEEws, of Williamsport, in the county of Lycoming and State of Pennsylvania, have invented a new and useful Improvement in Muley-Saw Gonnections; and I do hereby declare that the following is a true and accurate description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon and being a part of this specification, in which- Figure lis a side elevation of the lower end of a muley-saw, showing the method of attaching the pitman to the saine, and Fig. 2 is a front elevation of the same.

Like letters refer to like parts in each figure.

The nature of this invention relates to an improved method of attaching the pitman to a muley-saw in such a manner that the line of the draft and overhang or rake in the saw may be readily and accurately adjusted to the requirements of the various kinds of timber to be sawed.

It consists, first, in riveting to the lower end of the saw a wedge-shaped strap, with its upper edges in the form of a half V, with which engages a lipped clamp, forming part of the stub-end of the pitman; and, secondly, in the employment of a key in the slot in the clamp under the saw for securing the same in any desired position.

In operation the tendency of the clamp is to tighten up on the strap and key, and prevent the latter from working loose.

In the drawings, A represents a section of the lower end of a muley-saw, on which is folded and riveted a metallic strap, B, whose upper edges are inclined downward and toward the saw, forming with the latter a half- V groove on each side of the same. The upi per edges of this strap are tapered o toward the back of the saw, forming a wedge.

C is a clamp constructed, as shown in Fig. 2, with a longitudinal slot running through it, in which the lower end of the saw is inserted, the angular lips c at its upper end dropping into the grooves on the upper edges ofthe strap B.

D is a key driven into the slot below the saw, and secures the same in place by forcing the upper edges of its strap against the lips c of the clamp, and is grooved on its upperedge to embrace the rounded edge of the strap.

E is a set-screw through the clamp, and serves to secure the key in place.

b is a longitudinal depression in the side of the key in which the set-screw seats itself, and when the latter is loosened the key may be moved back without liability to fall out of the slot.

In the operation of muley-saws it is necessary to have the downward draft or strain come in a certain line, more or less removed from the line formed by the points of the teeth, which varies with the kind of timber to be sawed. In the ordinary method of connecting the pitman with the saw, holes are drilled through the saw and stub-end, which are connected by pins or bolts passing through them. This method of attachment permits of no adjustment of the pitman so as to vary its line of strain on the saw.

By the employment of the device above described the strain may be brought on any desired point by shifting the clamp to the proper place on the strap, where it may be secured in the manner described.

The strap being wedge-shaped, the tendency of the clamp is to tighten itself' on the strap and key by the pressure of the log against the saw. The key being grooved to embrace the rounded edge of the strap, the saw is prevented from wavering or deviating laterally from its true course when'sawing through knotsor timber out of wind.

The arrangement described is equally applicable to the upper end of the saw.for connectingit with the guide, in which case the clamp is made pendent from the guide, allowing the rake of the saw to be changed from the top, if desired.

`What I claim as my invention, and desire to secure by Letters Patent, is

l. The strap B, in one piece, with equal inner edges tapering regularly alike from one and the same end to the other, provided with inwardly-sloping bevels c, and with a rounded outer edge, as shown and described, and for the purpose set forth.

2. The key D, grooved on its upper edge to iit closely to the outer rounded edge of the strap B, and provided with a longitudinal depression, b, to receive the inner end of the setscrew E, as shown and described, and for the purpose set forth.

EMANUEL ANDREWS.'

Witnesses: H. S. SPEAGUE,

H. F. EBERTs.

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