US593574A - Carpus french - Google Patents

Description

(Nd Model.)

0. FRENCH.

SAW SET.

No. 593,574. Patented Nov: 16,1897. I

UNITED STATES PATENT I OEEIcE.

.OARPUS FRENCH, OF OSIIAXVA, CANADA.

SAW-SET.

SPECIFICATION forming part of Letters Patent No. 593,574, dated November 16, 1897.

Application filed April 20, 1896.

To all whom it may concern-.-

Be it known thatl, OARPUS FRENCH, manufacturer,of the town of Oshawa, in the county of Ontario, in the Province of Ontario, Canada, have invented certain. new and useful Improvements in Saw-Sets, of which the following is a specification.

My invention relates to improvements in saw-sets; and the object of the invention is to design a form of saw-set in which the force of the blow on the shank of the set may be exerted, practically, directly above the tooth, and in which also the set may be held close to the blade and the point of the tooth'held clear of contact, so as not to injuriously affect it during the operation; and it consists, essentially, of forming, in conjunction with the body and detachable block and V-shaped notch in the block, an inwardly-inclined recess in the body within the V-shaped notch in the block and extending upwardly above such recess, the block being designed to come below the bottom edge of the inclined recess, and, further, in providing a set-screw at the bottom end of the shank to vary the degree of set, as hereinafter more particularly explained. I

Figure 1 is a cross-section of my saw-set and saw-blade, showing the manner of applying the set. Fig. 2 is a detail of the body. Fig. 3 is a detail of the block.

In the drawings like letters of reference indicate corresponding parts in each figure.

A is the main body of the saw-set. The upper portion of the body A is tapered from about the center upwardly to the upper end. At about the center are formed shoulders a. The block is here reduced in diameter and has a continuous taper downwardly on two opposite sides only, the other sides being parallel to each other. The lower tapered portion I designate A. The upper tapered portion, which I shall designate A is formed with the corners rounded off for convenience in handling. The section of the lower portion A, however, is rectangular in cross-section, although tapered.

a is an angular recess formed in one of the inclined sides of the tapered lower portion A, the long face of the recess being pref- Serial No. 588,290. (No model.)

erably formed from the bottom edge upwardly.

Bis a block which is made to fit the tapered lower portion A and provided with an inclined V-shaped notch b at its lower inner edge, but on the same side as the recess a. The lower end of the block B extends below the lower edge of the recess a, as will be seen on reference to Fig. 1 full lines, and dotted lines in Fig. 2.

O is a set-screw which extends through the lower end of the portion A and which is provided with a lock-nut o. D is the saw-blade, and d a tooth.- By means of the set-screw O, the end of which necessarily abuts the blade D when the set is placed in position, the amount of set required may be given to the upper end or point of the tooth d, the straight face of which is held against the upwardly-inclined face of the recess a. By moving the set-screw so as to extend farther through the portion A toward the blade the amount of set is of course decreased, and by moving the set-screw in the opposite direction, so that the end of the-setscrew next the plate comes closer to the portion A, the amount of set of the point of the tooth is correspondingly increased when the blow is given on the top of the set. In giving such blow it will of course be understood that as the point of the tooth does not abut any metal,but is left free in the recess a,such point will not be blunted or otherwise injuriously affected, but will receive a perfect set when the blow is given.

It willbe noticed,as hereinbefore described, that the lower edge of the block B extends below the lower edge of the recess ct,and consequently when the set is placed in position the tendency of such set when the blow is given, on account of the bending tendency given by having the lower edge of theblock below theedge of the recess a, is'to make the lower end of the saw-set and blade approach each other.

In ordinary saw-sets now commonly in use the tendency is the reverse-that is to say, the lower portion of the set is liable to spring away from the blade when the blow is given, and thereby serve to destroy the efficiency of the set. In my invention, howerer, the set will be caused to remain close to the blade and the efliciency of the set consequently not affected at all, so that when the tooth is withdrawn the set will be perfect.

It will be seen from this description that I am enabled, by simply using one side of the tapered lower portion and one recess in the block, to give any degree of set required, and. this, too, on any-sized tooth, as the V-shaped notch in the block is made broad enough to take the largest size tooth, and the apex or back of the tooth fits the apex of the recess.

What I claim as my invention is Asaw-set comprising a body having a shoulder, an inclined side below said shoulder,

said side having a recess therein, extending at an obtuse angle thereto and designed to form a non-vibratory means for bending the .tooth over the lower angle of the recess, a

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