US2333233A

US2333233A - Tool

Info

Publication number: US2333233A
Application number: US437657A
Authority: US
Inventors: Bold Herbert
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-04-04
Filing date: 1942-04-04
Publication date: 1943-11-02
Anticipated expiration: 1960-11-02

Description

H. BOLD TOOL Filed April 4, 1942 INVENTOR HERB ERT BOLD. (7M f1 Vm.

Novo 2, 1943.

Patented Nov. 2, 1943 einen UNITED STATES' PATENT OFFICE l 2,333,233 v Toor.

' Herbert Bold, cleveland, ohio vApplicationspin 4, 1942, serial No. 431.657

\ (ci. 'zr-ss) 7 claims.

This invention relates to a tool particularly adapted for cutting away or boring metal forming the inner wall of a. hole, cavity, cylinder and the like, whereby the diameter of a hole may be enlarged or annually recessed, the inner wall oi a cavity or cylinder may be grooved or enlarged from end to end or intermediate its ends or the end wall of a hole,`cavity or cylinder cambered or beveled.

In tools for carrying out operations ci this character, or" which 1 have knowledge, the' cutting element was adjusted by a cut-and-try method; that is, the cutter element was manually engaged and moved endwise and then secured in its adjusted position, and then the operative would test the tool with a work piece or attempt to measure its position. This sort oi construction would often require several ad iustment operations, and when iinally adjusted the operative was compelled to carry out the -f intended operation, at least partially, to determine the accuracy of the adjustment. In tools of this form of construction and method of adjustme'nt, very often one or more work-pieces were ruined 'and hence wasted. In making ad Justments of this character, the setting of the cutting element 7cecoxnes largely a matter oi guess'-worlt, so that where the work pieces must he finished in accordance with exact specied dimensions, great danger of inaccuracy occur ring is present; also, when two or more tools are being employed on work pieces of like character danger of non-uniformity of the finished pieces is also present.

One object of the invention is to provide an improved tool of this type having micrometer adjustment ineens, whereby the cutting element may he adjusted predetermined distances scv cording to specified dimensions at the will oi the operative, whereby work pieces may he propa erly nished and danger of non-uniformity eluni-` noted.

relates from the following description taken in,

connection with the accompanying drawing,

wherein 1 Figi l is a viewLpartlyin section, 'oi a tool embodyingmy invention.'

Fig. 2 is a fragmentary bottom plan view.

Figs. 3 and 4 are sections on the lines 3-3 and respectively o'f Fig. 2.

Figs. 5 and 6 are perspective views of details.

Fig. 'i is a fragmentary view, partly in section, showing a modified form of construction.

in the drawingr i indicates as an entirety a shank, provided at its outer end with a cutting element 2 mounted as hereinafter set forth. The

inner end of the shank i is shaped to be rigidly, but removably mounted in a clamping device (not shown) provided on a driven spindle or shaft in relation to a support or bed for the work-piece to bev operated upon. The clamping device, spindle or shaft and support or bed are not shown as they form no part of the present invention and may loe of standard or special construction. The

- shank. i, inwardly-of its outer end, is circumfer- Another object of' the invention is to provide entially reduced, as shown at 3 to form a bearing tor the inner end portion of a-rotatable sleeve il and a shoulder fia against which the inner end of the sleeve bears. The shank i, outwardly of the hearing 3, is reduced circumferentially as shown at E5, relative to the bearing 3 for a purpose lar set forth. 6 indicates .a collar surrounding the reduced portion 5 of the shank and ilned` thereto preferably by a countersunl: set screw l, The inner end or the collar forms a shoulder Cia against which the outer end of the sleeve i bears, the shoulders da, da, serving to prevent movement of -the sleeve axially of the shank during its rotation. The inner wall ofthe collar t adjacent its inner end is recessed, as

shown at 55h, for a purpose later set forth. Aty

one side, the reduced portion 5 of the shank i is rornied with a longitudinally extending slot t, of non-circular shape in cross section, the walls of which form guides for a thrust member il, arranged. to loe moved endwise therein. The guide slot d preferably terminates inwardly of the outer end ofthe shank i for a purpose later set forth. The outer end of the thrust member il is inclined or beveled from its inner side outwardly, as shown at da, for engagement with the inner end of the cutting element 2, whereby outward movement of the Athrust member 9 is effective to move the cutting element 2 c ndwise outwardly. The thrust member S is extended inwardly into overlapping relation to the sleeve d and is operatively con nected to the latter, as later set forth, whereby rotation oi the sleeve serves to eifect endwise movement of the thrust member 8. The cutting element 2 is slidably and removably mounted in an elongated/through opening I8 formed in the end portion of the shank I, the inner end oi' the opening I8 merging into the guide. slot 8 so as to provide for the engagement of the cutting element by the outer beveled end of the thrust member'e and extending diametrically to the opposite side of the shank I. In the form of construction shown in Figs. 1, 2 and 5, the opening I8 extends in an outwardly inclined direction, at an angle of substantially 53 degrees relative to the axis of the shank I, so as to position the outer end of the cutting element 2 opposite the outer end of the shank I. In this arrangement, the inner end of the cutting element 2 is preferably disposed at right angles to its axis and the beveled end 8a of the thrust member 8 is preferably inclined at the same or complementary angle relative to the f axis of the shank I as the opening III. Where the opening for the cutting element 2 is disposed diametrically at right angles to the axis of the shank I, as shown at I8 in Fig. 7, the inner end of the cutting element 2 is beveled preferably at an angle of 45 to its axis, and the end 8a of the thrust member 8 is correspondingly beveled.

By preference the collar 8 extends to a point adjacent the outer end of the shank I to close the guide slot 8 at its outer end and to maintain ing I8.

The outer end of the shank I outwardly of the opening I0 o1' I0' is formed with a threaded v opening II disposed at right angles to the opening I 0 or III' and extending at its inner end thereinto and arranged to receive a countersunk set screw I2 which may be tightened against the cutting element 2 to rigidly secure it in its adjusted position. By terminating the guide slot 8 inwardly of the outer end of the shank I, such end is closed to exclude grease, oil, circulating duid and metal chips from the slot 8 and suflicient metal is provided for forming the openings III or In' and II and inserting a relatively large set screw In the latter.

The inner wall of the sleeve 4, from its outer end inwardly throughout a portion of its length is provided with screw threads Il and the outer side of the thrust member 8 is correspondingly threaded, as shown at I4 for engagement with the screw threads I8, so that by rotating the sleeve 4, which is held against endwise movement by the shoulders 4a, 8a, endwise movement is imparted to the thrust member 8.

It will be observed that the screw threads I3. I4, have a, predetermined pitch relative to the inclination of the co-acting engaging ends between the thrust member 8 and cutting element 2, whereby rotation of the sleeve 4 a predetermined distance will eilfect a predetermined endwise movement of the thrust member 8 and the latter in turn will adjust the cutting element 2 a predetermined distance outwardly. By reason of the co-ordinated relationships between these parts, designated graduations II, preferably in thousandths of an inch, on the sleeve 4 and movable relative to a fixed mark I8 on the shank I, serve to indicate to the operative the amount of adjustment of the cutting element 2, which will result from each rotation or partial rotation of the sleeve 4; he is thus enabled to readily determine the necessary angular movement of the sleeve for any desired adjustment of thelcutting element and to eil'ect such adjustment accurately.

The recess 8b accommodates the scre'fw threads I 4 when the thrust member 8 is moved outwardly, whereas the reduced portion l of the shank I accommodates the screw threads I8, being engaged thereby to form a bearing for the cuter end portion of the sleeve.

I1 indicates a through opening formed in the shank I and extending diametrically thereof and at an inclined angle from a point inwardly of the sleeve 4 to a point outwardlyl of the inner end of the latter, so as to merge with the reduced or bearing portion 8. 'I'he inner end portion of the opening II slidably supports a plunger I8 arranged to engage the inner wall of the sleeve 4. The walls of the outer endportion of the opening II are provided with screw threads tov take a set screw I8, arranged to engage the outer end of the plunger I8 and when tightened against the latter it clamps the plunger I8 against the sleeve 4 to' prevent its rotation. Y

By preference, the guide slot 8 extends inwardly beyond the reduced portion l to insure clearance.

To position the parts for operation, the sleeve 4 is rotated in that direction to move the thrust member 8 inwardly approximately to the limit of its movement, then the cutting element 2 is inserted in its seat or supporting opening III with its inner end against the collar 8, and then the sleeve 4 is rotated in the opposite direction until the 0 graduation I5 on the sleeve 4 coincides with the mark I8 on the shank I, which coincidence indicates that the thrust member 9 is set in position, that is, in engagement with the inner end of the cutting element 2, ready to adjust the latter outwardly in accordance with movement of the sleeve 4 relative to the mark I8.

From the foregoing description it will be noted that the cutting element 2 is capable of adjustment to effect precision cuts or' boring operations and is also removable so that cutting elements of varying lengths may be employed dependent upon the size of the opening in vwhich the tool is to operate and other conditions.

To those skilled in the art to which my invenshank the outer sideof which is formed with a longitudinally extending slot, a thrust member slidably mounted in said slot and provided on its outer side with screw threads, a diametrically extending seat formed in the outer end yportion of said shank and communicating at its inner end with said slot, a cutting element slidably mounted in said seat with its inner end in the path of movement of said thrust member, said thrust member and the inner end of said cutting e element having co-acting surfaces, whereby endwise outward movement of said' thrust member serves to adjust said cutting element relative to the axis of said shank, inner and outer sleeves surrounding said shank in end-to-end relation and arranged to formA the outer wall for said slot, and means for securing said outer sleeve to said shank, said inner sleeve being rotatable on said shank and provided on its inner wall with screw threads arranged to engage the screw threads on said thrust member to move the latter endwise.

2. A tool as claimed in claim 1, wherein means are provided on said shank outwardly of said seat for iixedly securing said cutting element to said shank in its adjusted position.

3. A tool as claimed in claim l, wherein means are provided on said shank inwardly of said slot for positively locking said inner sleeve against movement.

4. A tool as claimed in claim 1, wherein means are provided on said shank outwardly of said seat for xedly securing said cutting element to said shank in its adjusted position and separate means are provided inwardly of said cutting element fo securing said outer sleeve to said shank.

5. A`too1 of the class described comprising` .a shank formed in its side wall with a longitudinally extending slot, a thrust member slidably supported in said slot and provided on its outer side with screw threads, a cutting element slidably mounted in the outer end portion of said shank and arranged to be engaged at its inner end by the outer end of said thrust member and moved endwise upon movement of said thrust member in one direction, a sleeve the inner end portion of which extends inwardly beyond said slot and rotatably fits said shank, and means on the outer end portion of said shank for preventing endwise movement of said sleeve during rotation thereof, the outer portion of said sleeve being provided internally with screw threads arranged to engage the threads on said thrust member and operable when rotated to move the latter endwise.

6. A tool of the class described comprising a shank the outer side of which is formed intermediate its ends with a longitudinally extending slot, a thrust member slidably mounted in said slot and provided on its outer side with screw threads, said thrust member having a cross section equal to that of said slot, a cutting element adjustably mounted in the outer end portion of said shank, and arranged to be engaged by the outer end of said thrust member and adjusted relative to the axis of said shank, a sleeve surrounding said shank, the inner end portion of said sleeve rotatably fitting said shank and the outer portion thereof being provided internally with screw threads in engagement with the threads on said thrust member, and means for holding said sleeve against endwise movement, whereby rotation thereof moves said thrust member endwise.

'7. A tool of the class described, comprising a shank having a reduced outer end portion forming an annular shoulder inwardly of its outer end, the side wall of said reduced portion intermediate its ends being formed with a longitudinally extending recess and adjacent its outer end said portion being formed with a diametrically extending openingleading into said recess intermediate the ends thereof and forming a seat for slidably supporting a cutting element, .inner and outer sleeves disposed in end-to-end relation and tting the reduced portion of said shank, the

inner end of said inner sleeve abutting said shoulder and the outer end of said outer sleeve engaging said shank outwardly of said opening, whereby said sleeves form the outer wall of and close said recess, means inwardly of said opening for securing said outer sleeve to said shank, separate means outwardly of said opening adapted to secure the cutting element in said opening, and a thrust member slidably fitting said recess and arranged to engage the inner end of the cutting element, the outer side of said thrust member and the inner wall of said inner sleevevbeing provided with screw threads in threaded engagement, whereby rotation of said inner sleeve on said shank moves said thrust member endwise to adjust the cutting element.

. HERBERT BOLD.