US709275A

US709275A - Boring-bar.

Info

Publication number: US709275A
Application number: US7922401A
Authority: US
Inventors: William A Neylon; John Gouldsbarry
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-10-19
Filing date: 1901-10-19
Publication date: 1902-09-16
Anticipated expiration: 1919-09-16

Description

4 Patented sept. 16,1302. w. A. Nl-:YLoN a .1. GUULDSBARBY. 1l

BORING BAH.

(Application med Oct. 19, 1901.)

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WILLIAM A.

NEYLON, OF ALLEGHENY, AND JOHN GOULDSBARRY, OF

MCKEES ROCKS, PENNSYLVANIA.

BORING-BAR.

SPECIFICATION forming part of Letters Patent No. 709,275, dated September 16, 1902.

' Application filed October 19,1901. Serial No. 79,224. (No modelh To a/ZL whom t may concern:

Beit known that we, WILLIAM A. NEYLON, residing at Allegheny, and JOHN GOULDS- BARRY, residing at McKees Rocks, in the county of Allegheny, State of Pennsylvania, citizens of the United States, have invented certain newand useful Improvements in Boring-Bars, of which the following is a specification, reference being had therein to the accompanying drawings, forming part of this specification, in which- Figure 1 is a view in side elevation of our improved boring-bar. Fig. 2 is a front end View. Fig. 3 is a vertical longitudinal section on the-line III III of Fig. 1. Fig. 4 is a cross-section on the line IV IV of Fig. 3.' Fig. 5 is a sectional view similar to Fig. 3, but showing the cutters extended to Vtheir full limit. Fig. 6 is a cross-section on the line VI VI of Fig. Fig. 7 is a detail view of one of the wedges. Fig. 8 is a cross-section on the line VIII VIII of Fig. 5. Fig. 9 is a detail View showing a modification dispensing with the separate wedges.

Our invention consists in an improvement in boring-bars, andis designedfor the purpose of providing a bar which is capable of adjustment to varying gages of diameter and also of being adjusted to compensate for the wear of the cutters, while embodying other features of advantage and novelty, as shall be more fully hereinafter set forth.

Referring to the drawings,.2 is the head of the boring-bar 3, which is secured and driven at its oppositeend in the manner usual with this class of tools. Mounted in a cylindrical cavity L in the head is a cylindrical expanding block or plug 5, adapted to'make therein a neat fit and to be capable of longitudinal movement in and out, While through a central opening 6 in the block passes arigid rod or bolt 7, tapped or otherwise secured, as at 8,into the head 2. The outer end of this rodv 7 is threaded, and upon it is mounted the adjusting-nut 9, fitting into a recess in the end of the expanding-block and secured therein by one or more pins 10, tapped through the side of the block and projecting into an annular groove l1 in the nut. The nut may,

however, be so arranged as to bear against the end of the block without recessing it, and

in such arrangement or when recessed, as shown, may, if desired, be retained in position by other suitable means--as, forinstance, an annular flange and proper securing means therefor. As thus arranged the expandingblock may be Inoved in or out of thehead by turning the nut up or down, which inward motion is for the purpose of expanding the cutters, while upon withdrawing the block the cutters may be set back. Such adjustment is secured through tapered Wedges 12, mounted in corresponding tapered ways or grooves 13 in the block of any desired number, the outer faces of the wedge being parallel to each other and to the center of the head, whne their inner faces correspond to the tapered Apitch of the bottom faces of the grooves upon which' the Wedges bear and make therewith a sliding fit. Iins 14, tapped in through the sides of the head, fit slidinglyinto corresponding holes 15, so as to prevent longitudinal movement of the wedges and also to prevent rotation of the expanding-block.

Suitable openings or apertures 16 are made in the side of the head 2, into which the inner ends of cutters 17 are introduced, such inner ends bearing against the outer parallel faces of the wedges 12 at whatever position they may be set, so that it will be seen that by adj usting the wedges the exact position of the cutters will be accurately controlled, and when they are thus set to the desired position, so as to bore a hole of a determinate diameter, may be secured in position by setsorews 18.

In the drawings we have illustrated an arrangement of four cutters equidistantly arranged in pairs, the bits of each pair being opposite to each other, the other pair being at right angles thereto. A preferable arrangement, as shown, is to locate one pair somewhat in advance of the other, thus providing for making a roughing cut with the iirst pair, while the iinishing cut may be made with the second pair, at one complete operation. It will be understood that in such case the cutting. diameter of the rst pair will be slightly less than the back pair, and when thus arranged with relation to each other or when a single pair only is used, as may be done, the bits or cutters may be adjusted in IOO orout uniformly by adjustment of the nut 9. A further advantage of locating one vpair in advancei of the other is that the front or roughing cutters may be ground back as they wear away clear to a line with the cutting edges of the back pair without causing any interference, as it is evident that the roughing cut may be made in any plane in front of the nishing cut. This feature-permitting regrinding of the bits-permits them to be used to exhaustion without necessity of removal and is a valuable feature of our invention. The advantages of this tool will be appreciated by all machinists and those familiar with machine-shop practice. The cutters are comparatively short, inexpensive, readily inserted, easily removed for regrinding, or may be reground While in position. The range of adjustment is very considerable and may be proportioned to the character of the work in view. It' desired, suitable attachments may be made whereby the outward adjustment of the cutters may be done automatically, so that in making a long bore, as in the case of gun-barrels and other similar mechanism, the diameter may be preserved uniform` throughout. The number of cutters may be varied at will, employing more or less than We'have shown, according to the work in view. Also, if desired, the separate wedges may be dispensed with and the inner end of each cutter beveled off to interfit with the tapered face of the expanding-block, as indicated in Fig. 9, as well as other changes and modifications which may be made by the skilled lmechanic without departing from our invention, and

we desire toinclude all such changes as within the scope of the following claims.

What we claim is- 1. A boring-bar provided with lateral recesses, cutters mounted therein, a central tapered expanding-block provided with longitudinal Ways, wedgesv mounted in the ways and adapted to bear against the cutters, means for adjusting the block and means for securing the cutters.

2. A boring-bar providedwith lateral recesses, cutters mounted therein, a central rigid bar provided with adjusting means on its outer end, an expanding-block mounted on the bar provided with tapered ways, and wedges mounted in the ways adapted to bear against/the cutters.

3. A boring-bar provided with lateral recesses, cutters mounted therein, a central rigid bar provided with adjusting means on its outer end, an expanding-block mounted or. the bar provided with tapered ways, wedges therein, and means for preventing longitudinal movement of the wedges.

4t. A boring-bar provided with lateral recesses, cutters mounted therein, a central rigid bar provided with adjusting means on its outer end, an expanding-block mounted on the bar provided with tapered ways, wedges therein, means for securing the cutters, and means for preventing longitudinal movement of the wedges.

5. In a boring-bar, the combination ofa bar provided with a cylindrical head having a cylindrical longitudinal cavity, lateral recesses extending through the sides of the head, cutters mounted therein, set-screws mounted in the head adapted to bear on the cutters, a smooth central longitudinal stem rigidly secured in the head and threaded at its outer end, a cylindrical expanding-block slidingly mounted on the stern, having a bearing for its full length in the longitudinal cavity and provided with longitudinal tapered ways, au adjusting-nut on the outer threaded end of the stem rotatably inserted in the end of the block provided with an annular groove, and securing-pins mounted in the block and extending into said groove, substantially as set forth.

6. In a boring-bar, the combination of a bar provided with a cylindrical head having a cylindrical longitudinal cavity, lateral recesses extending through the sides of the head, pairs of cutters mounted in the recesses, one of such pairs being in advance of the other, set-screws mounted in the head adapted to bear on the cutters, a smooth central longitudinal stem rigidly secured in the head and threaded at its outer end, a cylindrical expanding-block slidingly mounted on the stein, having a bearing for its full length in the longitudinal cavity and provided with longitudinal tapered ways, an adjusting-nut on the outer threaded end of the stem, rotatably inserted in the end of the block, provided with an annular groove, and securingL pins mounted in the block and extending into said groove, substantially as set forth.

In' testimony whereof We affix our signatures in presence of two witnesses.

WILLIAM A. NEYLON. Y JOHN GOULDSBARRY. Witnesses:

JAMES M. DUFFY, HUMPHREY LYNCH.

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