US1180377A - Saw. - Google Patents

Description

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J. F. CONKLIN.

SAW.

APPLICATION FILED NOV. 15. 1.915.

Patented Apr. 25,1916.

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JOHN F. CONKLIN, OF SOUTH BETHLEHEM, PENNSYLVANIA.

SAW.

Specification of Letters Patent.

Patented Apr. 25, 1916..

Application filed November 15, 1915. Serial No. 61,679.

To all whom it may concern:

Be it known that 1, JOHN F. CONKLIN, a citizen of the United States, residing at South Bethlehem, in the county of Northampton and State of Pennsylvania, have invented a new and useful Saw, of which the following is a specification.

The present invention appertains to saws, and relates more especially to metal cutting saws.

It is the object of the invention to provide a metal cutting saw embodying a novel assemblage of the blade and teeth, whereby the teeth are removable, the teeth being normally held firmly in place to with stand the strains to which they are subjected, being constructed of highly tempered metal to increase the service or life of the saw, and being readily removed in order that they can be resharpened.

It is also within the scope of the invention to provide a saw of the nature indicated which is comparatively simple and inexpensive in construction and manufacture, and which may be thoroughly practical, reliable and efiicient in use.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein Figure 1 is a fragmental elevation of the saw. Figs. 2 and 3 are enlarged sectional details taken on the respective section lines 22 and 33 of Fig. 1. Figs. 4 and 5 are edge elevations of the channeling and finishing teeth, respectively. Fig. 6 is a perspective view of one of the channeling teeth.

In the drawing, 1 designatesthe rotary disk-like blade of the saw, which is provided at its margin or edge with an annular series of relatively short radial open slots or recesses 2 having the rounded inner ends 3. Said slots are tapered from their outer open to their inner ends, so that the outer open ends are slightly wider than the inner ends. The rear edges of the slots 2 are convexed transversely, as at 4, while the forward edges of the slots are provided between and spaced from the opposite sides of the blade 1, with longitudinal rounded grooves 5 extending to the margin or edge of the blade, the same as wlth the convexed edges 4. The margin of the blade 1 is provided immediately in advance of each slot 2 with a V-shaped recess 6 forming with the respective slot a rounded lug or abutment 7 at the outer end of the respective groove 5.

The slots 2 provide means for the attachment of the removable teeth to the blade, there being alternate channeling and finishing teeth, each of which embodies a flat tapered shank 8 slipped longitudinally into the respective slot 2 to fit wedgedly therein flush with the sides of the blade 1. Alternate shanks 8 are provided at their outer ends with channeling bits 9, while the other shanks are provided at their outer ends with finishing bits 9, the contours of the bits being clearly illustrated in Figs. 4 and 5. The bits 9 serve to channel the metal, while the bits 9 finish the cut, it being noted that the bits 9 have an approximately V-shaped cutting portion, while the cutting portion of the bits 9 are widened. The bits 9' have outwardly divergent sides, and the cutting portions of the bits 9 are wider than the shanks 8 and blade 1 to provide a clearance between the cut metal and the saw. The bits 9 preferably project slightly beyond the bits 9 so as to start the out, while the bits 9' finish the out. The bits 9 being narrower than the bits 9' will effectively start the out, and the bits 9 will widen and finish the out, without producing a ragged or burred edge.

Each of the bits 99' is provided with a forwardlyprojecting cutting nose 10 having an oblique face whereby the bit has a sharp cutting point. The bit has its outer face or edge disposed obliquely to provide a clearance between the heels of the bits and the metal which is being out. The projecting nose 10 of each bit fits snugly upon and rests against the respective lug or abutment 7 of the blade 1, it being noted that the nose 10 projects toward the respective recess 6, so that said recess provides a clearance in front of the tooth for receiving the chips. The nose 10 of the tooth in resting against the abutment 7 will serve to effectively brace the bit in order that it can better withstand the strains to which it is subjected.

. The rear edge of each shank 8 is concaved transversely, as at 11,- to snugly fit the convexed edge 4: of the blade, and the forward edge of each shank 8 is provided between terfit with one another, to prevent the transverse or sidewise displacement of the teeth, the teeth being driven into place in order that they will be held within the slots to prevent the loss or outward displacement of the teeth. Theouter ends of the tongues or ribs 12 terminate short of the noses 10, to provide the clearances 13 which allow the noses 10 of the bits to be properly formed to snugly fit the abutments 7.

When the teeth are driven into place, there will be an approximately semi-circular opening between the inner end of each slot and/the respective shank, into which opening a suitable implement can be fitted for i purpose of prying thetooth loose, when it is desired to remove the same for purpose of resharpening or replacing it. The teeth can thus be readily detached. In certain cases, an elongated strip or shim ll can be disposed between the concaved edge 11 of each tooth and the convexed edge 4 of the slot. 2

as illustrated at the right hand side of Fig. 1, and, this strip or plate ll can be made of such metal or material as to frictionally hold the tooth in place. For example, if the tooth and blade are constructed of steel. the strip 14'. can be. constructed of brass, copper or equivalent material, whereby when the tooth is driven into place, the strip H will cause the tooth to be frictionally held within the slot. The strips ll can also be employed for m'operly setting the 'teeth, since, when a strip H is employed, it prevents the tooth from being driven into the'slot as far as it could if the strip were not used. Thus, by

using strips 14 of various thicknesses, the

teeth can be adjusted. The strips 14 are preferably composed of flexible material in order that they conform to the curvatures of the edges 11 and 4c of the teeth and blade, respectively. The use of the strips 14 is optional, since in some cases, they may not be desired, while in othercases, they are of danger of dislodging the teeth or hrea king or bending the contacting portions of the teeth and blade.

The present invention eliminates the use of ordinary wedges now used, and also enables the teeth to be rc-sharpened without removing them if desired.

Having thus described the. invention. what is claimed as new is:

In a saw, a. blade having an open slot, and an abutment in advance of said slot, a tooth having a shank fitting in said slot and a. bit at the outerend of said shank. said bit having a forwardly projecting nose resting against said abutment, the rear edges of said slot and shank being curved transversely and an elongated flexible friction strip iii ting longitudinally between said rear edges of the slot and shank, said st rip conforming to the curvatures of said rear edges of the shank and slot and serving to hold the shank tightly in place.

In testimony that I claim the foregoing as my own, I have. hereto allixcd my signature in the presence of two witnesses.

JOHN F. CONKLIN.

lVitnesses JAMES T. NVOODRING, J r., CLARENCE H. BOEHM.

tiopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. (2.

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