US1419448A

US1419448A - Boring head

Info

Publication number: US1419448A
Application number: US437864A
Authority: US
Inventors: Cecil E Davis
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-01-17
Filing date: 1921-01-17
Publication date: 1922-06-13
Anticipated expiration: 1939-06-13

Description

C. E. DAVIS.

BORING HEAD.

APPLICATION FILED 11111.17,1921.

1,4; EQAQ8, 111611 111111 13, 1922.

CECIL E. DAVIS, OF MONTEZUMA, KANSAS.

resins HEAD.

Application filed January 17, 1921.

To all whom it may concern:

Be it known that T, Cnorr. DAVIS, a citizen oil the United States, residing at lliontezuma, in the county of Gray and State of Kansas, have invented certain new and useful Improvements in Boring Heads, of which the following is a specification.

This invention relates to boring heads and it comprises a body portion having mounted therein radially adjustable cutters, means for expanding said cutters outwardly, and means for withdrawing said cutters when said expanding means has been withdrawn, said withdrawing means being adapted also 5 to coact with said expanding means for looking the cutters in any selected position within their limits of movement.

An important object of the invention is to provide a boring head wherein the adjustable cutters may be quickly and easily set and locked without the use of set screws.

Other objects and advantages of the in vention will be apparent during the course of the following description.

In the drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout,

Figure 1 is a side elevation of the tool assembled,

Figure 2 is a central longitudinal sectional view through the device,

Figure 3 is a section taken on line 33 of Figure 2,

Figure a is a similar view taken on line 4; 1 of Figure 2, and,

Figure 5 is a detail perspective of the cutters and the expanding member.

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment ofthe invention, the numeral 10 designates the body portion of the tool as a whole. The body portion 10 includes a relatively large cylindrical portion 11 at one end thereof and a relatively small threaded end 12 adapted for connection with any suitable source of power. The body portion 10 further includes an intermediate tapered portion 13 connecting the cylindrical portion 11 with the threaded end 12. The outer end of the cylindrical portion 12 is provided with a bore 14:, and the inner end thereof is provided with an internally threaded bore 15 communicating with the bore 14c. The

inner end of the bore 15 communicates with a radial slot 16., which extends throughout Specification of Letters Patent.

Patented June 13, 1222.

Serial no. 437,86 l.

the length of the tapered portion 13 and a short distance into the cylindrical portion 11 ot the body portion.

As shown in Figures 2 and i, a plurality of cutters 17 are mounted in the slot 16. The body portions of the cutters are oblong in cross-section and of substantially the same width as the slot 16. As clearly shown in Figure 2, the inner and outer edges of the body portions of each of the cutters are parallel, and inclined with respect to the axis of the body portion. The cutters are provided with the usual cutting edges 18.

A screw-threaded plug 19 is mounted in the threaded bore 15 and provided in its outer end with a slot 20 for the reception of a screw driver or the like. The inner end of the plug 19 carries a preferably integral shank 21 having a cylindrical head 22 se cured to its end.

The numeral 23 designates an expanding member or wedge which is oblong in crosssection and of substantially the same width asv the slot 16. The faces 2 1 of the expanding member are adapted to contact the sides of the slot 16 to prevent rotation of the eX- panding member with respect to the body portion.

As shown in Figure 2, the edges of the expanding member are inclined to correspond to the inclination of the inner edges of the cutters and are adapted to bear thereagainst to move the cutters outwardly upon movement in one direction of the expanding member. The member 24 is provided in its larger end with a T slot 25 to receive the shank 21 and head 22.

A locking member 26 is provided in the form of a sleeve, to limit the outward move ment of the cutters to any selected position. One end of the sleeve 26 is internally screw-threaded, as at 27, to receive the inner portion of the member 12. The inner end of the sleeve 26 is provided with a conical opening 28, the sides of which are inclined at an angle corresponding to that of the outer edges of the cutters 17. The outer end of the sleeve 26 may be formed polygonal in shape as at 29 to receive a wrench or the like when it is desired to clamp the cutters 17 in position.

The operation of the device is as follows:

hen it is desired to set the cutters at an increased diameter, the sleeve 26 is rotated to withdraw it from contact with the outer edges of the cutters. The plug 19 is then screwed inwardly by means of a screw driver or the like, the inner face of the head 22 engaging against the inner face of the slot to move the expanding member 23 inwardly. Tie edges of the expanding member, engaging against the inner edges or the cutters, move the latter outwardly until the desired diameter of the cutting edges has been reached. The sleeve 26 is then rotated to move it inwardly and a vrench applied to the polygonal end 29 thereof to tighten the surfaces of the conical recess 28 against the outer edges of the cutters. When it is desired to decrease the diameter of the cutting edges the sleeve 26 turned slightly to loosen its connection with the cutters, whereupon the plug 29 may be withdrawn. The sleeve 26 is then rotated to move it inwardly and the surface of the conical recess, engaging the outer edges of the cutters, will move the latter toward the axis of the tool until the desired diameter has been reached whereupon the plug 19 may be rotated until the expanding member 23 grips against the cutters to hold them firmly in the desired position.

it is to be noted that means have been provided for both expanding and contractthe cutting members and that the cutting members are firmly engaged on opposite sides to hold them firmly in the desired position.

While the form of my invention herewith shown and described is to be taken as a preferred example or the same, it is to be understood that various changes may be made in the size, shape and arrangement of parts without departing from the spirit 1,41 seas of the invention or the scope of the subjoined claims.

I claim:

1. A boring head comprising a body portion provided with a threaded bore and a radial slot communicating with said bore, a plurality of cutters mounted in said slot, an expanding member mounted in said slot between said cutters, said expanding memher being provided in one end with a substantially i -shaped slot, a threaded plug mounted in the threaded bore of said body portion, said plug being provided with a shank and head adapted to be received in the slot of said expanding member, and means for locking said cutters against outward movement.

2. A boring head comprising a body portion provided with threaded bore and a radial. slot communicating with said bore, a plurality of cutters mounted in said slot, an expanding member mounted in said slot between said cutters, said expanding member being provided in one end with a substantially T shaped slot, a threaded plug mounted in the threaded bore of said body portion, said plug being provided with a shank and head adapted to be received in the slot of said expanding member, and a longitudinally movable sleeve carried by said body portion and adapted to contact the outer surfaces of said cutters.

lin testimony whereof I aflix my signature in presence of two witnesses.

CECIL E. DAVIS.

i Vitnesses:

ALTON N. DAVIS, A. J. CLARK.