US851399A - Annular boring and reaming tool. - Google Patents

Description

m 9 1 om 2 R P A D m u H O H T A P m I N B MR SD NN A G R Bm .B B0 B R A L U N A APPLIOATIOH FILED HAY 29, 1906.

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UNITED STATES OFFIQE.

BENJAMIN BROWNSTEIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGN OR OF ONE-HALF TO HARRY L. ZOOKOVITZ, OF TRENTON, NEW JERSEY.

K To all whom it may concern:

ANNULAR BORING AND REAIVIING TOOL.

Specification of Letters Patent itatented April 23, 1907.

Application filed May 22, 1905. Serial No. 261,536.

Be it known that I, BENJAMIN BROWN- sTE1N-,a citizen of the United States, residing j at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improve-.

ments in Annular Boring and Beaming Tools, of which the following is a specification.

Thisinvention relates to improvements in annular boring and reaming tools, wherein there is a receding center, resiliently supported, so that as the ring is cut the central portion or plug of metal which is removed may pass within the tool.

Different methods of supporting the spring I to the center and to the tool are illustrated,

together with different forms of springs. The interior bore of the too] is spirally grooved or rifled. The center is split at several points to allow for .any difierences of expansion between it and the tool on account of different material of which they are composed, together with different efiects caused by hardening or tempering, and other features which are more fully set forth in the specification.

The invention is illustrated in the accom panying drawing in whichsimilar parts are designated by similar characters of reference,inwhich Figure .1.is a full length boring and reaming tool, partly in section, Fig. 2 isa boring and reaming tool minus its shank, and shown in central section, the center being supportedby a,spring of alternate difierent diameters, a threaded holder for the sprmgi i333 asectional view on line B. Figsli 4, 5',' of..a boring and reaming tool, showing in the spiral and grooving, or rifling of its interior-and a springin two different diameters-with nd-holder having an enlar cd-fend. Fig ls'a cross section on line Q3, showingthe eccentric backin ofiF In- 1 t e tool l-has a shank 2 suited to a socket which may be either straight. or tapered, and the shank has an oil hole 3, and a connected duce oil tothe interior chamber 5; the lower end of the tool being tapered for reaming and oil hole 4, through whichto intro-.

(provided with cutting edges 6, from which l are spiral flutes 7.

At the lower inner end of the tool is a center spindle 8 secured in a socket which comprises a head 9 a body 10 and an annular shell 11, only the shell part closely fitting within the chamber 5, the head 9 and body 10 being of less diameter than the shell 11, so as to clear the walls of the chamber 5; as the tool and shell may have unequal expansion and contraction, owing to different ualities of metal being used, as well as to (itl'erent density and hardness. The shell is divided by slots 12 (best seen in Figs. 2, 5) to make it in a measure yielding, and to prevent friction and sticking. The chamber 5 may be provided with spiral flutes 13 which leave recesses for oil flowing between the narrow ing the cutting end and the annular center, clearly shown in Figs. 3, 4, 5, for guiding the shell 11.

In Fig. 1 the head 9 is screw threaded to the same pitch as the spring 15 within which it is screwed and secured, the upper end of which asses through an eye 17 formed at the end of the spring, and by which the spring is kept from turning, as head 9 is app ied or removed.

In Figs. 2, 3 a spring is used which is wound in alternate groups of coils of a small diameter 18 and large diameter 19, the head 1 9 being secured to a large coil which has an end bent to enter a hole 20, while the upper end of the spring by a small coil 18. screws 21 and passes beyond on to a neck 22 of less diameter than the interior of the screw. where it freely rests. under the head 23 se cured to the tool by pin 24, and having oil holes 25 therethrough. A sto plate 26 is inserted between coils 19 and as a projection 27 inside of the coil and projection 28 out side of the coil to keep it in placeg its object'being to prevent coils 18 on neck 22 from being distorted so they cannot come off of end 21. As the tool is shortened by wearing. and grinding the spring must be shortened, and as the small coils 18 must always go freely over end 21, and as they are liable to be distorted by cutting, the large coils are provided, which may be out without damage to the small coils.

intermediate bearing strips 14, for lubricat- In Fig. 3, the spring is held by a modified form of holder comprising an end 29 having V shaped sides over which the coil is forced to a neck 30 on flange 31 secured to the tool by pin 32.

In Fig. 4 is shown the clearance line formed by milling on an eccentric line 33 from cutting edge 34 to groove 7 on line C. C. Fig. 3.

Fig. 5 is an end View showing the taper 35 of the tapered reaming edge.

' I claim.

1. A' boring and reaming tool having an end with cutting edges for boring, a longitudinal chamber, reaming flutes upon the exterior surface, a spring secured Within the chamber, a socket within the chamber and secured to the spring and a centering device carried by the socket.

2. An annular boring and reaming tool, a cutting end therefor having a chamber therein, a spring suspended in the chamber, and a movable center attached to the spring and comprising a spindle secured to a socket which socket in part clears the chamber and in part consists of a shell of annular shape which fits the chamber, said shell being provided with slots to allow for expansion and contraction.

3. In an annular oring and reaming tool, a cuttlng end therefor, having a chamber therein provided 'wlth bearing surfaces and intermediate oil grooves, a spring suspended in the chamber and a movable center secured to the spring, said center comprising a spindle'secured to a body which in part clears the chamber and in part is a slotted shell fitting the chamber.

4. An annular boring and reaming too having a straight body part, a chamber therein, the exterior of the body part terminating in a tapered reaming part provided With flutes, the exterior surface between the cutting edge of each flute and an adjoining flute being eccentric, cutting edges at the end1 of the tool, and a receding center for the too I 5. An annular boring and reaming tool comprising a body portion having a shank at ,one end and a cylindrical portion with a chamber at the other end, said latter end being provided with cutting edges and the extreme surface of the annular portion being tapered, and a spring secured inthe chamber and carrying a centering device adapted to recede into the chamber.

Intestimony whereof I affix my signature in presence of two witnesses. V

BENJAMIN BROWN STEIN. Witnesses: I

RANSOM C. WRIGHT, WILLIAM C. STOEVER.

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