US383103A - Inserted saw-tooth - Google Patents

Description

"F. W. COOK.

INSERTED SAW TOOTH.

(Nb Model.)

Patented May 22, 1888.

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PATENT rricn.

FREDERICK W. COOK, OF SAN FRANCISCO, CALIFORNIA.

INSERTED SAW TOOTH.

SPECIFICATION forming part of Letters Patent No. 383,103, dated May 22, 1888.

(No model.)

.To aZZ whom it may concern:

Be it known that I, FREDERICK XV. (Icon, of the city and county of San Francisco,State of California, have invented a new and Improved Means of Securing Inserted Teeth in the Plates of Circular Saws, of which the following is a specification.

lhe invention relates more particularly to the means of fastening the cutting-bits within their holder-plates and to the means of inserting and removing the said bits; and it consists in the peculiar form of the holder-plate, as particularly described below.

In the accompanying drawings, forming a part of this specification, Figure 1 is a perspective view of a broken-off portion of a sawplate with my improvement applied thereto. Fig. 2 is a side, and Fig. 3 an edge, view of my key used to spring open the holderplate in removing or inserting the bits.

In the drawings, Fig. 1, A is a brokenoff part of a saw-p1ate, which is provided at regular intervals at its periphery with proper re cesses to receive the tooth or cuttingbit holders B.

O is the cutting-bit.

b is the spring-limb of the tooth-holder.

a a are the holes, one in the saw-plate and one in between the body of the toothholder and the spring-limb b.

c is a slot separating the spring-limb from the body of the holder.

d is the ordinary rivet locking the holder in its recess.

eis the usual notch in which a tool is inserted when driving out the holder from its recess.

The tooth-holder has the usual Vgrooved edge fitting the A-pointe'd edge of the recess it fits in; also,where the outer edge of the bits bear against the body of the holder the same V-joint will be made. (See dotted lines.)

At the upper part of the cutting-bits there will be shoulders f f, where they bear against the body of the holder and the spring-limb. There may be a shoulder at g, where the bottom of the bit bears against the body of the holder. Where the lowest corner, h, of the bit bears against the springlimb, the bit must project into a recess formed on the springlimb to receive it, as at z. This prevents the bit from flying out as the saw rapidly revolves.

The dotted line on Fig. 1, drawn from the bottom of the groove 0 to the vertical edge of the holder just below the rivet d, marks the joint between the springlimb and the holder, if the two should be made separate, as some might prefer, because, as the spring-limb more rapidly thins and wears away than will the body of the holder, it might be replaced when worn, while still retaining the body of the holder. The disadvantage of this would be that in making the spring-limb separate there might occur an undue strain on the saw-plate in driving home the cutting-bits-a matter entirely avoided where the spring-limb and body of holder is of one solid piece of metal.

In Figs. 2 and 3 is shown the tool used to spread open the springlimb when inserting or removing the cutting-bits. This tool is 00111- posed of the lever D, having a pin for a fulcrum at D. On the extreme end there is pivoted a link, E, which has its fulcrum-pin at E. hen the fulcrum-pins D and E are insert-ed, one in the hole a of the saw-plate and the other in the hole a between the body of the holder and spring-limb, and the lever D is forced into a position more nearly in line with the attached link, the effect will be to spread apart the spring-limb and allow the bit to be either inserted or withdrawn, as the case may be.

I do not claim any novelty in the mere fact oflocking the cutting-bit in its bed bya spring limb, for there are quite a number of devices having this feature as a principle. My invention has no further scope than to be an improvement in the manner of arranging the cutting-bit, holder, and spring-limb together, so as to be safer and generally more practical than other devices within my knowledge belonging to the same class.

What I claim,therefore, as my invention,and desire to secure by Letters Patent, is as follows:

The inserted sawtooth herein described, consisting, essentially, of the holder B, oblong in shape, fitted in a recess in the saw-plate and set lengthwise upon an approximately radial line, the upper halfof the forward edge of the ICO holder extending beyond the recess and havedge of the holder along the bottom and up ing a spring, b,t0 hold the cutting-bit in place, the forward edge to the root of the spring I), all 10 adapted to spring forward unobstructed by the combined as and for the purpose described. saw-plate, a cutting-bit, O, inserted in the upper forward corner of the holder in a recess out I FREDERICK 0001b diagonally therein, and a saw-plate with re Witnesses: cesses to receive the bit-holders, the edges of GEORGE PARDY,

which extend the entire length of the back WATT L. BROWN.

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