US1442152A - William b - Google Patents

Description

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Jan. 16, 1923.

Patented Jan. 16, 1923.`

UNITED STATES PATENT OFFICE..y

WILLIAM R. HURD, 2D, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, 0F PATTERSON,v NEW JERSEY, A. CORPORATION-OI:` NEW JERSEY.

MANUFACTURE OF TOOLS.

Original application led March 11, 1918, Serial No. i 1920. Serial To all whom t may concern: Y

y Be it known that I, WILLIAM R. HURD, 2d, a citizen of the United States, residing at v Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in the Manufacture of Tools, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to the marking of tools and particularly steel tools on or in which marks of identification or other significance are impressed. 1n some'cases, for example rotary cutters used for trimming the edges of shoe-soles, the most convenientl if not the only practical location for such marks is on or in one of the flat end faces that lie at right angles to the axis. Nearly all if not quite all cutters for the purpose mentioned have` hubs at their rear ends and it has been common if not universal practice to apply identification marks such yas the name or initials of the manufacturer, a trademark, or numerals denoting the size, style vor other distinguishing features by impressing them into the rear face of `the hub. This location has disadvantages both from the` standpoint of the manufacturer and also from that of the user, and in order'to show just how these disadvantages arise it will be well to consider the necessary steps in the manufacture of the tools as heretofore practiced.

After a cutter blank has been turned, bored, milled, and otherwise machined to the desired form, but before it is hardened, impression dies are brought to bear against the end ,of its hub to provide it with the necessaryv marking while the metal is sufficiently soft to receive the impressions. After the impressions have been made the cutter is hardened and then ground to sharpen it and to true its front face so as to provide a flat seat for the rand-crease guard or shield. The rear end of the hub has been chosen for receiving such impressions because it does not require grinding and therefore the legi- `bility of the impressions is unimpaired, but, for reasons hereinafter stated, the radial thickness of the hubs is so much restricted 221,812.` Divided and this application led July 29, No. 399,785. v

This invention provides a new method. ofA

manufacture by which the aforesaid. objections are avoided and by which' anew `and improved cutter is produced. the present application being a division of `my former ap-r plication Serial No. 221,812, filed March 11,

Although, for convenience, the :present invention is described particularly with regard to cutters for trimming the ledges of shoesoles its fundamental principles and advantages are applicable to anysteel tool that requires hardening and'grinding vand inwhich it is necessary or desirable to impressv identification marksi .i Y

n In one respect, therefore, the invention consists in forming a` depression in a face thatyfor any reason will subsequently require grinding,` and in impressing the marks on or in the surface forming the depression so thatIV they will be'below the plane of the ground surface vand therefore will not be obliterated by the grinding operation.

In' the case. of cutters for the Apurpose stated the front face of `each cutter must Vbe fiat and lievtrulyat right angles to the axis so as to provide a suitable seat for the usual shield by which the cutter is prevented from scarring the upper of the shoe. Accordingly, a feature of the present invention.v consists in forming ka depression, preferablyan annular, concentric depression, in thefront face of the cutter and thereafter impressing the marks sin or in the surface of. this depression so far from the bore that the latter will not ,bedistorted This not only affords a relatively largey area .for the `impressions but avoids the necessity of the reaming operation hereinbefore mentioned. y

Another feature of the invention consists iii forming the depressionso that thelshield will cover andl close it and thusl prevent .dust

` fothjatoftheholer The. er

Carreflbr@rotary Shaft- 2l which.V iS driven.. Whilefthejholrl@ 20 .is also driver the. fronti .gip

The several features of the invention are illustrated by the accompanying' drawings and are hereinafter described and 'claimed' Referring to the drawings` Fig. l represents a perspective view oi" a.

rotary.4 edge-trimming,cutter embodying; the invention 5 Fig. 2 represents such a cutter in section as' being held in the jaws of a rotaryholderpbyl which it is rotated in contact with the grinder-in .contacta-with itstfrontdace.; and

Fig. 3 is a section including aportioniofi an edge-trimming machine including` such a cutter' assembledwith other-elementsk ot' :welllinown construction. in. such machines.

Accordinga` to. .the example. illustrated the cutter comprises. abodyportion l0;v a. hub l1 extendingfto the rear, andteeth l2 having cutting edges Beforeth'e cutter blankl has been hardened or ground a` depression vis formedin-the front face of-th'eb'ody portion, said depressionpreferab-ly beingformedby turning ATso asto h'preserveaccuratef-balance. Thfe'fdfepression-ispreferably-formed rso Vas to l leafvev Va f" concentric`-A annular! langeA 14 contiguous to the bore for 'sustainingthe shield notches between'theY teeth 1.21 rAfter-'this depressionpis formediandgbet'oi-'e the blankA has* been'harden'efdi an-ydesired, words. nu-

meralsV orfothrfsymbols may be impressed in toy th ody '510' yinl thel surface, forming the depress.ion-.- Figli includes twoV :f rroupsl ot symbols indicated 211316,;k 17. These symbols need not.; be implresseddeeply, because they lie below the planetowvliich the front face 0f the utterwll.subsequently be ground- After the vrimpressions rhave ybeen. made the blank Ina-rfb@ 'Hardened and. then presented to. a. grinder. Such, @what indicated at 18 in Fig; 2M Ashshown bythisigure thelcutter is clamped by jawslg, 19 tornoiripj,parts. ot a" rotary holder 2Q, the Ytorniations ot lthe cutter andjjawsl being. such. to maintain the agriso-the cutter in concentric relation facefoflth'egcutt trued towaplauetat right angles to thev axis ofthe cutter. "Ihe-llfnge 14 shoulderl l5,

and'teeth 12 are thusngriound-,to a corn-mon.

plane forming a Iseat forthe shield 22 illustratedg iIiE-i'g,k 3,V v

Figo.; qrepr'seuts a fragment 0f an edgetrmmlipgm Thine ot w.ell-k.lmwn` Construction. 11dey .-,a..cutter.s.heft:23a @bearingetthr'e'iof, y .Shield 22, and a Screw 26 for holding the 'deviceA with the cutter.

der 18 is Y beine. thereby ground and' an expansibl'thimble. 21,5ftln-3l parts in assembled relation. The shaft has a tapering portion 27 to which the thimblc 25 is litted. This thimble fits the bore ot the cutter-and is provided'with a flange 28 arrangedto abut against the rear end of the hub .ot theA cutter.V The shield Q2 has a flat -tacethat lies. against the ground andtrued Atrout tace ot' the cutter and. that covers the depression 13 so as to exclude dirt- The shaft is bored and tapped to receive the screw. 26 andfwhen;thelatter is tightened `it not only clamps the shield against the Afront face of the cutter but forces the thimble along` the tapering portion-ottheshai't so thatthe thimble is expanded vto form a tight coupling betweenthe shaft andthe cutter.

It' has been stated that the hub of the cutter'- is restricted to a relatively small radialidimension. This condition is due in part, atl least, tothecommon practice of using-some kind ora'.supplementaryY tool or In some casesga eather-edgingdevice is mounted on-the hub of the cutter while in other cases heelbreast-guard--in the form offa ring is mounted on the hub in place offthe feather-edger. Fig. 3 includes broken lines representing conventionalh7 a feather edger Oof-wellknown construction, such device comprisingoperating blades interposed between the teeth yoftheA cutter and a hub or bodv portion 3l bearing on the hub of the cutter. These are. suihcient examples of vthe reason wh)v the radial dimension of the hub ofV the cutter is so much restricted that the identiication marks mav notib'e impressed' legiblyy into the hub without being so close to the bore as to produce the aforesaid distorvtion andrequire the aforesaidreaming to correct the distortion.l Y Having thus described my invention1 what l claim as new and desire to secure bv Letters Patent of the United States is: l. That improvement in the art ot manufacturing cutters which consists in forming a depression in the end of the cutter, stampmp,` commercial'data in the depression, hardening the cutter and X`grinding the end face.

2. That improvement in` the art of manufacturingcutters which consists in forming an ai n ul J r depression in the end of ther'cutng ai riby at thembore to support a :stamping emmer-cial data in the dellO nE hardening the. cutter and grindfaoturing rotaryv sole-trimming cutters hav-y ing hubs of relatively small radial dimension projecting from the yrear face of the body portions, which consists in forming a depression .in the front face of the body portion so that a portion of said depression will be farther from the center than the rim of the rear end of the hub is, impressing one or more marks in the face forming said depression so that some portion of said mark or l marks will be farther from the center than said rim is, hardening the cutter, and grinding the front face of the body portion so as to true it but not so deeply as to touch the turning a concentric depression in a trans verse face of a cutter-blank, impressing one or more marks in said depression While the 20 ing machine parts which consists in making 25` a depression in a'bearing surface of a steel part While the steel is soft, impressing one or more marks in the bottom of said depression7 hardening the part, and grinding said bearing surface to true it.

In testimony whereof I have signed my name to this specification.

WILLIAM R. HURD, 2ND.

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