USRE2719E - Improved swage foe sharpening saws - Google Patents

Description

J. EEMERSON.

Swage for Sharpening Saws.

Reissued Aug. ,1367.

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J A M'E S E. E MERS O N, OF THE NT 0 N, NEW J ERSEY.

Letters Patent No. 55,262, dated June 5, 1865: reissue No.2,719, dated August 6, 1867.

IMPROVED SWAGE FOR SHARPENING'SAWS.

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'ro lALL WHOM IT MAY CONCERN Be it known that I, JAMES E. EMERSON, of Trenton, New Jersey, have invented a new and improved Swage for Sharpening Saw-Teeth; and I do hereby declare the following to be a full and exact description thereof, reference beinghad to the accompanying drawings, and to the letters of reference marked thereon.

Figure 1 is a side view of my invention.

Figure 2, a longitudinal central section of the same.

Figure 3, a front view ofa saw-tooth sharpened by my implement.

Figure 4, an end view of my improved implement; r

Figure 5,'a detached perspective view of the die pertaining to the same.

Figure 6, a detached and enlarged front view of the die.

Similar letters of reference indicate like parts.

This invention relates to a new and improved swage for sharpening saw-teeth. The swages hitherto used for this purpose, so far as bringing the tooth to a. proper cutting edge was concerned, answered quite well, but the difiiculty attending their use consisted in their inability to give the edge of the tooth any required shape orv proportion; for instance, the edge of some teeth would be made too broad, others too narrow, and many would not be of. the proper form, and hence, after sharpening the teeth of a saw, they require to be dressed up or finished by filing.

i; My invention consists in providing the swage or implement-with a die constructed in such a manner that aserving as a portion of theniould to bring the points of theteeth toa proper feather or sharp edge, will i to give a proper shape and size to the point or cutting edge of the tooth, so that all the teeth of a v espond both in shape and dimensions. 'Alr presents what may be'termed the shank or body of my improved implement, which may be of steel throughout, and of slightly taper form, as shown in figs. 1 and 2. The large end of this shank is formed with an extended lip, a, one surface of which, the inner one, is a plane, and at the inner end of this lip in the shank there is made a recess, 6, of circular form in its transverse section, to receive a cylindrical die, B, which is formed with a lip, c, to bear orrest against the end cl of the shank, as shown clearlyin figs. 1 and 2, together forming a mould in which the point of the tooth is shaped. This die is of steel, and it is formed with a recess,

F e, the sides of which are inclined, as shown at ff in fig. 6, andthe bottom is slightly convex, as shown at g.

This die is tempered extremely hard, as hard as may be, at the side in which the recess e is made, and the same may be said of the innersurface of the lip a. The die B is inserted in its recess 6 in the shank A in such a position that the recess e will have a proper relative position with the inner surface of the lip a, the bottom of e, and the inner surface of a forming the swage. p g

The implement is adjusted to the point of the tooth G, the latter being in the angle formed by the inner surface dand the bottom of the recess '0, as shown in red in fig. 2, and the small end of the shank A is struck by ahainmer, and the end of the tooth upset or swaged into the properor desired form, the inner surface of the slip agivin g th'e proper shape to the outer side of the tooth, the bottom of the reccsse giving the proper shape t'fo the bottom or under side of the tooth, the outer and under side 9f the latter being brought-to a featheredge,

while the sides ff of the recess e give the proper shape to the sides of the tooth. Thetooth, it will be seen, cannot bc-spread laterally beyond the sidespf the recess e, and hence all the teeth of a. saw will be swaged to a corresponding size and shape, and will require no dressing up or finishing with a file. Different dies, having different-sized recesses 0, may housed, as circumstances require, and t in fig. 7 shows a portion of a die intended 'to swage the tooth'without regard to its spread laterally;

Inorder to insure uniformity and regularity in. the projection in the cutting edge of the tooth, a guiding groove, i1, shown in figs. and 4, is formed in the under side of the shank of the punch A, which groove receives the outer edge of that tooth which next precedes the tooth to be dressed, so that the punch and its die will be always guided directly and perpendicularly to the edge of the tooth under treatment, and bear equally upon every part ofits width, thus preventing any obliquity of the tooth, andpreserving for the line of its cutting edge a. direction at right angles with the plane of the saw. The groove h is also necessary, inswaging saws with small teethfltoallow,thc'platetopass therein, so that the'points of the teeth can-reach the proper place in the die.

first used merely forming the teeth to nearly the size It will he found expedient under certain eiroum-staiueesto shalrpen the tooth-by successive operations. In this case a. movable pin, having one or more dies (fig. 'ijlfor ptogressive formation, is used in the swage, the dies necessary to fill the finishing dies and giving them uniformity of direction and thickness, when their eutting'edg e vwill bc finished by shifting the pin in its position in the swnge, using the die for that purpose. d I v I do not claim broadly the sharpening of saw 'teeth by menus of a, swagn. for such implement has been used for that purpose, but I (10 claim-- 1. Swaging the teeth of sews, m1 forming them into suitable shape and width, and bringing them ton propel-feather or cutting edge at one operation hy'theeombined operation of a die in or on the piece of steel.- and a blow u1'ion the swage, substantially in the manner and for the purpose set forth.-

2. I Claim the swage-stoek or handle A and the piniB, whcn comhined mid usedsubstantially in the manner and for the purposeset forth; v I

3. I elaniltlfe groove h, when used in eomhinutionwith the swege, for'the purpose of allowingthe teeth of the saw to come up to the die, as herein-set forth. i I Y Y JAMES E. EMERSON. Witnesses I Emu, F. BnowN, C. D. BROWN.

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