US302831A - Ltjthee e - Google Patents

Description

Urtrrnn '8rarns Farnwr @triest LUTHER R. FAUGHT, OF PHILADELPHIA, PENNSYLVANIA.

BORlNG=TOOL GPECFICATION forming part of Letters Patent No. 302,831, dated July 29, 1884.

Application filed December 29, 1883.

To @ZZ whom, i6 may concern:

Be it known that I, LUTHER R. FAUGHT, of the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new anduseful Improvements in Boring-Bars, of which improvements the following is a speeiiication.

My invention relates to boring-bars of the class having two transverse slots at right angles one to the other, each adapted to receive a tool or cutter, instances of which are' illus trated in Letters Patent of the United States Nos. 241,481, 253,523, and 289,522, granted and issued to me under dates of May 17 1881, February 14, 1882, and December 4, 1883, respectively.

The object of my present invention is to enable a higher standard of strength and durability of the cutters to be attained; and, further, to provide effective and desirable means for securing` the same in position, with the eapaeity of ready and convenient removal and replacement, as may be required.-

The improvements claimed are hereinafter fully set forth.

l'n the accompanying drawings, Figures 1 and 2 are vertical longitudinal central sections at right angles one with the other, respectively, through the lower portion of a boring-bar embodying features of my invention, Fig. 3, a transverse section through the saine at the line x x of Fig. 2; Fig. 4, a bottoni view of the shoulder-block detached; and Figs. 5 and 6, longitudinal central sections at right angles one with the other, respectively, showing a modification of the means for securing the cutters.

1n the practice of my invention the' boring bar Ais, similarly to those of my several Letters Patent aforesaid, provided with two trans verse or diametric slots, a and a,which, in the case of a vertical bar,or one projecting from a spindle, as in Figs. 1, 2, and 3, are located adjacent to its lower end, and in horizontal bars having supports at cach end, as in Figs. 5 and 6, may be arranged in pairs at desired intervals in the length of the bar. The'width of said slots is, as in the Letters Patent referred to, such as to admit easily the boring-tools or cutters, and their depth is greater than the depth thereof, so as to allow of the introduc- (No model.)

tion, clamping, and removal of the same, as

required. In lieu, however, of employing two cutters of equal depth and recessing or notching each of them centrally to bring their cutting-points as nearly as possible in the saine plane, as in my prior constructionsd provide, under iny present invention, a cutter having a central opening or passage which is closed at bot-h its ends, and a shallower cutter hav-` ing no recess or opening, and adapted to be passed through the opening of the cutter first nained. In lieu, further, of forming end shoulders upon the cutters and supporting the saine against peripheral dies in the bar, 1 construct the cutters with central bearing projections or shoulders abutting against a central bearing, either Xed or removable in the boring-bar, and secure both cutters in position by a single clamping screw or key, all as presently hereinafter to be described.

Referring to Figs. 1 to 4., inclusive, the transverse slots d and a of the boringbar A are suited, respectively, to receive a cutter, E, and a cutter, F, which is shallower than the cutter E to such a degree as to pass freely through a transverse opening or passage, e,

formed therein. The passage c, which is closed completely at each end by the metal of the cutter, is preferably of substantially circular forin, with a attened throat, c', at bottoni, which bears against the lower side of the cutter F. In cutters of smaller size the width of the passage c may be reduced as desired, to maintain proper strength in correspondence with reduced lengthof the cutter, so that the passage shall be of rectangular or elliptical form, with strong curves or fillets at top and bot-tom. The cutters E and F have plain or straight faces at top, upon which are formed central bearing projections or shoulders, cl and f, respectively, the bearings of which are formed in a shoulder-block, B, of hardened steel, inserted and fitted tightly in the upper end of acentral opening, ai, in the bar A. The block B has a transverse recess, b, on its lower side to receive the deeper cutter E, the shoulders e'Z of which bear against the top of the recess, and the shoulders f of the cutter F bear against th'e lower ends of the jaws b' on each side of the recess, separate and independent bearing seats or faces being thus pro- IOO -20 position in the bar.

vided by the shoulder-block B for each of the cutters E and F. In order to enablethe shoulder-block to be withdrawn from its position when required, a female thread, b2, is cut centrally within it from the recess b to its upper end, the clear opening ofthe recess being not less than the outer diameter of saidthread, and by inserting a corresponding screw of sufficient length to bear against the top of the 1o opening a2, in which the shoulder-block is fitted, the latter may, by the rotation of the screw, be readily backed out and withdrawn. The opening a2, which extends withoutreduction of diameter to the lower end of the boring-bar, is threaded at and adjacent to its lower end, to engage the vexternal thread of a bushing, C, which is internally threaded to act as the :uut of a central clamping-screw, D, by which the cutters are secured in working The cutter E being placed in its slot c, and the cutter F inserted Vin its slot a and passed through the opening e of the cutter E, and each cutter being adjusted to project for equal distances from the bar on both sides of its axis, the clampingscrew D is screwed to a tight bearing against the lowerside of the cutter E, thereby forcing the shoulders e2 of said cutter against the bearings at the top of the recess b ofthe shoulder- 3oy block B. The tightening of the clampingscrew D causes the throat e of the passage to bear coincidently against the lower side of the cutter F, and to force the shoulders f thereof against their bearings on the lower ends of the jaws b of the shoulder-block, the clampingscrew thus acting, by its direct thrust, to fix and hold both the cutters. The surface of the throat e of the cutter E and the correspond ingabutting surface of the cutter F are curved or segmental in central transverse section, as shown, so that a central pivotal bearing, through which accurate adjustment may be obtained, is afforded. An annular recess is formed in the upper portion of the bushing and is filled with suitable packing, c, which surrounds the upper unthreaded portion of the clampingscrew D and protects-the threads thereof from the contact of borings or other foreign matter.

The construction shown in Figs. 5 and 6 is one which is specially adaptable to boringbars supported at both ends, but which, as indi'cated by dotted lines in Fig. 6, is likewise vapplicable to a boring-bar which has no lowerv 55 end support, as hereinabove described. The cutters E and F constitute one pair of a series located at desired distances apart in the length of the bar A, and fitting in transverse slots a c', at right angles one tothe other, each of said slots being in line and communicating with two of a series of four longitudinal grooves or recesses, a,in the bar. In lieu ofthe shoulder- `block removable bearings before described, fixed bearings are provided for the shoulders of the cutters in the metal of the bar, the shoulders or bearing projection e2 of the cutter E fitting against central bearings in av transverse opening, g, in thebar A, and the shoulders fof the cutter'F fitting against similar bearings in one side of the slot a. 'Ihe cutters are secured in position by a transverse key or wedge, G, which, in combination with the cutters E and F, performs the same function as and acts as the mechanical equivalent of the clamping-screw D, before described. The key G, which is not, per se, claimed herein as of my invention,\vill be set forth in another application for Letters Patent to be filed in due timeV by me.

It will be obvious that my improvements are equally applicable in connection with one or a pair of cutters, and that where two are used one may be readily removed and replaced without interfering with the operation of the other, which is left in position to be used singly,

if so desired. The advantage in point of sim-V plicity and economy of construction, by dis pensing with the end shoulders and bearings, is a material one, and, in addition thereto, the shoulders are removed from an exposed outer position to a comparatively secure inner one. It will be seen, further, that the shoulders are unaffected in position by the stretching of the cutters that may from time to time be necessary to keep them up to standard size, and are exempt from their former liability to breakage in hardening or in use, and that thestrength and durability of the cutters are promoted by the substitution of a single closedended passage for the two open recesses heretofore employed.

I claim as my invention and desire to secure by Letters Patentl. The combination, substantially as set forth, of a transversely-slotted boring-bar, a tool oncutter having formed through its body a central hole or passage suited to admita cutter of less depth, and a clamping-screw.

2. The combination, substantially as set forth, of a transversely-slotted boring-bar, a

tool or cutter having a central bearing projection and fitting in the slot of said bar, a bearing located centrally in said bar and abutting against the bearing projection of the cutter, and a clamping-screw bearing against the opposite face of said cutter.

3. 'Ihe combination, substantially as set forth, of a boring-bar having two diametric slots at right angles one to the other, a tool or cutter having a central bearing projection on one of its sides, and having a hole throughit, said cutter tting in one of the diametric slots of said bar, a cutter having a central bearing projection on one of its sides, said cutter passing through' and bearing against the opening of the cutter first specied and through the opposite slot of the bar, bearings located centrally in said bar and abutting against the .bearing projections ofthe cutters, and a clamping-screw bearing against the face of. the cutter first specified opposite its bearing proj ection.

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4. The combination7 substantially as set forth7 of a boring-bar having two dianietrio slots at right angles one with the other, a shoulder-block fixed in a central opening in said bar, above the slots thereof, a pair of tools or cutters fitting in the slots of the bar, each of said cutters havinga central bearing projection on one of its sides abutting against a seat or face on the shoulderblock, and one of said cutters being passed through a central opening or passage in the other cutter, and a clamping screw or key bearing against the cutter Which is provided with said opening or passage.

LUTHER ,1%. FAUGHT.

Vitnesses:

J. SNOWDEN BELL, GHAs. E. Pnnoonsr.

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