US2258097A - Boring bar - Google Patents

Description

oct. 7,' 1941. G. MENAUALEA 2,258,097

BRING BAR Original -Filed Jan. 25, 1937 2 sheets-sneek 1 Oct. 7, 1941. G. MENAQUALE l 2,258,097

BORING BAR Original Filed Jan. 25, 1 957 2 Sheets-Sheet 2 m KLJ/1&5 am

Patented Oct. 7, 1941 y BORING BAR 'y Guido'Menaquale, Camden, N. J

substituted for abandoned application Serial-Nm 122,313, January 25, 1937. June 13, 1940, Serial No. 340,357

This application 6 claims. L(o1. ifi-58) This invention relates to a structurally novel and improved boring bar characterized essentially and primarily bythe incorporation therewith of a radially adjustable duplex cutter, and manually regulated micrometer actuating means therefor. This application is a substitute application for application No. 122,313, filed January 25, 1937. Y f

I-t is a matter of common'knowledge that a so-called hand adjusted'cutting tool is not new in this particular line of endeavor. It follows, therefore, that my primary aim is to generally improve upon prior .art and marketed arrangements by providing a special'adaptati'on and mechanical coordination of features susceptible of enabling the desired result to be more satisfactorily obtained, whereby to providev an arrangement more aptly fitted for the special purposes intended.

In reducing to practice the mechanical principles of the invention conception, I have evolved and produced an ingenious selection and coordination of features characterized by readily available finger-controlled actuating means for adjusting the cutting means on opposite ends of the tool with respect to the boring bar with requisite accuracy and certainty.

A further feature ofthe invention is predicated upon the adoption and use vof a pair of individually adjustable cutting tools onthesame boring bar, wherein these are disposed at longitudinally spaced order and in cruciform or intersecting relationship ,to insure a substantially continuous boring action.

Other features andadvantageswill become more readily apparentfromgjthefollowing' description and drawings. y n Y, Y

In the accompanying drawingsjwhereinlike numerals are employed to designate corresponding mechanical parts throughouttheviews; Figure 1 is a perspective View of the complete boring bar showing the cutter tool and micrometer adjusting rand actuating means therefon'lthis being the preferred embodiment of the invention,

Figure 2 is an enlarged fragmentary detail section of the essence of the invention, *that is, the cutter and its adjusting means. n' j Figure 3 is a `horizontal sectional view'with the cutting tool removed,

Figure 4 is a perspective view of the specially constructed :toothed cutter or tool, Y

Figure 5 is a perspective View of the spiral ribbed or threaded rotary'v feeder disk, ,Y

Figure 6 is a perspective view of the special adapter guide and spring-retention cup,

vFigure 7 is a view in side elevation showing a modification ofthev invention utilizing inner and outer cutters disposed at substantially right angles to Veach other .for a double action boring result, and

Figure 8 is a slightlyv enlarged horizontal sectional View' taken approximately on the plane of the line 8--8 of Figure '7.

lBy' way of introduction to. the' detailed desoription it is to be pointed out Vthat the embodiment of the invention depicted in Figures 7 and 8 is a duplioationof the cutter and adjustingmeans therefor illustrated' inlliguresA 1 to 6, inclusive. It is thought that'- the description mayl therefore proceed more satisfactorily by describing first the invention seen in said Figures 1 to 6, inclusive. Thereafterthe modification disclosed in Figures 7 andB will be exclusively described As indicated' in 'Figure 1 the boring bar comprises ythe customary longitudinally elongated cylindrical bod'yportion S and the tapered shanky portion IQ, thesebeing conventional features. As i-ndicatedinli1igure 2 a-socket Il is bored inthe lower end ofthe body 9', this being internally screw-threaded as 'indicated at I2. This socket is in communication with an intersecting passage or borev t3? for` the cutter tool I4. It will be observed that the cutter tool is Yprovided with cutting elementslland lliv at opposite ends. Moreover said tool is provided on one surface with a'plurality of longitudinally spaced parallel segmental adjusting or regulating teeth l1. The teeth vwork through clearance notches yIla in the body 9 asl shown for rexample in Figuem. .A

Considering 'now in detail the manually regulated actuating means for the-toothed cutting tool attention-rst comes to the part I8 depicted in Figure'l 6. `This is a spring thrust as well as adapter cup. Its marginal screw-threaded portion is tapped in-to the threads l2 to position it in the socketv Ilr as shown to advantage in Figure 2; At its center itis provided rwith a bearing i9. This bearing is adapted to accommodate. a disk head 20- on the adjusting screw 2l'. The adjusting screw'is providedk with lugs and these cooperate with companion 'lugs Von thev actuating disk 22 to form what may be generally referred to as a universal joint 23. This Vactuating, disk is provided on its operative side with a spiral rib 24'which is in effect a thread. This thready is positioned to cooperate progressively with the segmental teeth ll'on the cutter as is obvious. The universal or swivel joint renders the threaded actuating disk 22 substantially self-leveling permitting it to occupy the desired canted or tilted position Within the area of the socket II as disclosed in Figure 2. It is to be observed that, that portion of the socket in which the disk rotates is obliquely formed for adequate adaptation purposes. The disk itself is pressed into constant yieldable contact with the teeth II through the instrumentality of a coil spring 25 which surrounds the universal joint and is interposed between said disk and the end thrust or retention cup I8.

The stem 2I extends out through the socket II and beyond said thrust cup I8 where it accommodates a dial disk 26. This disk telescopes into the socket as seen in Figure 2 and has a projecting peripheral abutment 21 properly beveled and graduated to co-act with the scale indicator 28 as seen in Figure 1. As clearly illustrated in Figure 2 of the drawings the outer free end of the bar has screw-threaded thereon a cap 25 provided with an inwardly directed flange 24. The upper surface of the periphery of the dial 21 is recessed for receiving the flange 24 of the cap securing the dial between the cap and the free end of the bar. The assembling and actuating nut is indicated at 29 and carried by the threaded stem and is bound tightly against the micrometer dial, whereby to rotate said knurled nut 29, dial and disk 22 in unison. That is to say, these parts rotate in relation to the adapter bearing or cup I8 making it possible to catch hold of the knurled nut 29 and to turn it to the desired degree to feed the cutter I4 either one way or the other in relation to the bar 9. When the desired adjustment is made the set screw 30 shown in Figure 1 is tightened to hold the cutter in set position.

As before indicated the arrangement depicted in Figures 7 and 8 includes the construction already described. That is to say, the cutter and adjusting means therefor is identical and, therefore, the same numerals are applicable to the same parts. The only thing to be brought out here is that the adjusting means is countersunk as seen in Figure 8, that is, countersunk into the socket 3| to avoid breakage during the rotation of the cutter carrying bar 9. Moreover the teeth on the cutter are on one side instead of on the bottom as seen in Figure 2. It is possible, however, that there may be novelty in this inner and outer cutter arrangement wherein the two cutters are individually adjustable and in positionsr at substantial right angles to each other. j

'I'he gist of the invention is reflected in the arrangement for trade in Figure 2. That is to say, novelty is predicated on the relatively slidable radially adjustable cutter tool I4 having segmental teeth II in proper progressive and constant feeding contact with the spiral threads on the rotary hand controlled disk 22. Under this arrangement itis possible to convert the rotary motion of the micrometer dial and associated nut 29 into the desired reciprocatory motion forA the radially adjustable cutter tool I4.` Thus, instead of resorting to guess-work and following haphazard methods of inadequately adjusting the cutter, it is possible with this arrangement to obtain precision adjustment to the point of requisite refinement.

It is thought that the description taken in connection with the drawings will enable a clear understanding of the invention to be had. Therefore, a more lengthy description is thought unnecessary.

While the preferred embodiment of the invention has been shown and described, it is to be understood that minor changes coming within the eld of invention claimed may be resorted to if desired.

Having described the invention what is claimed as new is:

1. In a structure of the class described, a boring bar provided with a radial tool accommodation passage, a cutter tool mounted for reciprocation in said passage, manually controlled resiliently mounted tool adjusting and locking means on said bar, and coacting operating connection between said means and said tool for actuating and adjusting said tool.

2. In a structure of the class described, a cylindrical boring bar provided in one end with a socket intersected by a radial passage, a slidable cutting tool mounted in said passage and provided with cutting elements on opposite ends projecting beyond the peripheral surface of said boring bar, that side of the cutter projecting into said socket being formed with longitudinally spaced segmental adjusting rack teeth, a dial regulated unit mounted for rotation in said socket, said unit including a rotary disk formed with spiral thread coacting with said rack teeth, and a coil spring for maintaining the thread in constant operative contact with the teeth.

3. In a structure of the class described, a boring bar having a socket, a passage intersecting said socket, a cutting tool mounted for sliding in said passage, said cutting tool being provided with longitudinally spaced segmental rack teeth, a cup mounted in said socket and including a central bearing, a threaded stem mounted for rotation in said bearing, dial-equipped turning means for said stem, a disk having universal connection with said stem, said disk being located in the socket and interposed between the cup and the rack teeth, and a coil spring surrounding the universal joint and bearing at one end against the disk and at the opposite end against said cup.

4. In a structure of the class described, a boring bar provided with a socket therein intersected by a radial passage, a slidable cutting tool mounted in said passage, that side of the cutting tool projecting into the socket being formed with rack teeth therein, and resiliently-mounted adjusting and locking means in said socket adapted to normally cooperate with said rack teeth for the fine adjustment thereof and being retractible therefrom to permit of the insertion of, removal from and rough adjustment of said tool.

5. In a structure of the class described, a boring bar having a socket therein intersected by a radial passage, a cutting tool mounted for sliding in said passage, said cutting tool being provided with longitudinally spaced segmental rack teeth therein disposed at an angle tothe longitudinal axis of the tool, a cup mounted in said socket and including a central bearing, a threaded stem mounted for rotation in said bearing, a dial equipped turning means for said stem, a disk having a universal connection with said stem, said disk being located in the socket and interposed between the cup and the rack teeth and being disposed at an acute angle to the longitudinal axis of the bar, and a coilspring surrounding the universal joint and bearing at one end against the disk and at the opposite end against said cup, said disk being provided with a spiral thread thereon, the coil spring normally maintaining a portion of the thread into coacting relationship with the teeth of said tool, said disk being retractible from the teeth of said tool for the insertion of the tool in the socket, the removal therefrom and the rough adjustment of the tool.

6. In a structure of the class described, a boring bar having a socket, a passage intersecting said socket, the longitudinal axis of that portion of the socket adjacent the passage being disposed at an acute angle to the longitudinal axis of the passage, a cutting tool mounted for sliding in said passage, said cutting tool being provide-d with longitudinally spaced segmental rack teeth therein disposed at an acute angle to the longitudinal axis of the tool, a cup mounted in said socket and including a central bearing, a threaded stem mounted for rotation in said bearing, dialequipped turning means for said stem, a disk having a universal connection with said stem and mounted for rotation in that portion of the socket adjacent the passage, a spiral thread on said disk coacting with said rack teeth, and a coil spring surrounding the universal joint and bearing at one end against the disk and at the opposite end against said cup normally maintaining the thread in constant operative contact with the teeth and permitting of the retracting of the disk from the tool for the insertion of the tool in the passage and the removal therefrom and rough adjustment of the tool in the passage.

GUIDO MENAQUALE.

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