US764466A - Tool-holder for lathes. - Google Patents

Description

N0. 764,466. PATENTD JULY 5, 1904. S. HENRY.

'I'OL HULDER FR LAILHES.

APPLIOATION FILED APE, 14, 190s. NO MODEL.

FWM u; N .A5

UNITED STATES aterited July 5, 1904.

JOHN S. HENRY, OF STONINGTON. CONNECIIGUT.

TOOL-HOLDER FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 764,466, dated July 5, 1904.

Application filed April 14, 1903. Serial No. 152,608. (No model.)

To all whom t may con/cern:

Be it known that I, J onN S. HENRY, a citizen of the United States, residing at Stonmgton, in the county of New London and State of Connecticut, have invented a new and use ful Tool-Holder for Lathes, of which the following is a specification.

This invention relates to tool-holders for lathes, and more especially7 to tool-holders for metal-turning lathes.

In turning any article upon an ordinary metal-turning lathe the common practice is to take ofi' a roughing chip with one form of tool, then to take off a finishing chip with another kind of tool, and finally to square up the work in order to complete it.

The object of this invention is to provide an improved tool-holder for lathes in which the various tools required to perform the several operations necessary to complete the turning of an article may be supported and the tool-holder so shifted in position after the completion of each step in the turning operation that the entire operation may be performed without removing the work from the arbor of the lathe.

A further object of the invention is to improve tool-holders of the type above specified by providing means to prevent absolutely any undesired movement of the tool-holder during the turning operation.

A further object of the invention is to provide a tool-holder of the class above mentioned with a positive and automatic locking device to hold the movable tool-supporting member in proper relation to the base of the toolholder.

`With the above-stated objects and others in view, which ivill appear as the invention is better understood, the same consists in the construction and combination of parts of a tool-holder hereinafter described and claimed, and illustrated in the accompanying drawings, forming a part of this specification, in which corresponding parts are designated by the same characters of reference throughout the `various views,it being understood that changes may be made in the exact form, proportions, and exact inode of assemblage of the elements therein exhibited without departing from the spirit of the invention or sacrilicing any of its advantages.

In the drawings, Figure l is a top plan View of the tool-holder supported upon a rest adapted to be mounted upon any ordinary 'forni of turninglathe- Fig. 2 is a vertical section through Fig. l on the line 2 2. Fig. 3 is a detail view showing the means employed for preventing disengagement of the rotatable portion of the tool-holder from the base. Fig. l is a detail view showing the arrangement of the sockets around the lower portion of the movable tool-supporting member.

Referring to the drawings by reference characters. 1 designates the rest, provided on its upper surface with a longitudinally-dis posed groove undercut on either side, as at 2.

3 designates the base of the tool-holder, which is preferably of substantially circular outline and provided with an arm l at one side. The base 3 has on the under surface thereof a rib 5, (seen in cross-section in Fig. 2,) adapted to fit the upper portion of the groove in the rest l. The base 3 has a central opening 6, through which extends the locking-bolt 7, having a square head 8, adapted to engage the undercut portions 2 of` the groove in the rest, as best seen in Fig. 2. The threaded end of the bolt 7 projects upward through the base portion 3 and has screwed thereon a nut 9, by means of which the bolthead is clamped lirmly against the undercut portions 2, above mentioned, and the base 3 is held in rigid association with the rest 1. On the upper surface of the base 3 there is provided an annular groove 10, at the outer edge of which there is an upwardly-disposed flange 11, which rises above the central part of the upper surface of said base 3. ln threaded engagement with sockets provided in the flange 11 are a plurality of small set-screws l2, having pointed ends, as best seen in Fig. 3, and adapted to engage a V-shaped groove 13 on the outer surface of the movable tool-supporting member 14 near the bottom thereof, as seen in Figs. S2 and 3.

The movable tool-supporting member 14 is provided at the bottoni with a downwardlyprojecting flange 15, which lits a groove prow vided on the upper surface of the base o and IOO 13, provided on the member 14. This V-v shaped groove extends circumferentially around the flange 15, which also has provided on its outer surface at equal intervals sockets 16 for the engagement of a spring-pressed locking-bolt 16, slidably mounted in the arm 4 of the base 3 and normally held in engage-l ment with a socket on the member 14 by a spring 17, mounted in the arm 4, as seen in Fig. 2, and held in operative position by a screwplug 18.

. Projecting radially from the tool-supporting member 14 at equal intervals are toolsockets 19, each of which is provided with a screw 2O in threaded engagement with an opening provided therefor in the upper portion of the tool-socket. Each of the toolsockets has an opening 21 extending radially outward and having a slight upward inclination toward its outer end, as best seen in Fig. 2, in order to give considerable rake to the tool mounted therein.

The tools 22, 23, and 24,mounted in the toolsockets 19, are of similar configuration as to shank, but have differently-shaped cutting ends to adapt them to the different kinds of work to be done by the various tools.

In order to hold the tool-supporting member 14 in practically firm contact with the base 3 during' the turning operation, the member 14 is centrally bored at the top, as indicated at 25, and a bolt 26, having a head 27 provided with ears 28 for convenience in turning it, is loosely carried in said bore, the threaded portion of the bolt being adapted to engage with internal threads in a socket 29 provided in the bolt. By means of bolt 26 when the member 14 has been brought into the desired position it can be clamped into close contact with the base, so that there will be no relative movement of member 14 and base 3 during the turning operation, thus doing away with the rattling that would otherwise occur and insuring more perfect action of the tools during the turning operation.

For convenience in indicating' the amount of inclination of the turning-tool to a line normal to the axis 0f rotation of the work the space between each pair of tool-sockets is graduated in the manner shown in Fig. 1, the Zero-point being placed at the middle of each space and the graduations reading each way from said point.

For convenience in turning' the movable member 14 on the base 3 a threaded socket 30 is provided on the outer surface of the movable member 14 between each pair of toolsockets, and a handle 31 (indicated in dot-and dash lines in Fig. 2) is provided to engage with said socket. l

In using my improved tool-holder it is mounted upon the tool-holder rest 1 on the lathe, as above explained, and the tool which it is desired to employ is brought into position to engage the work on the arbor by withdrawing the spring-pressed locking-bolt from engagement with the sockets in the movable member 14 and turning said member 14 to the desired position. If one of the sockets 16 is then in position to be engaged by the locking-bolt, the bolt will automatically enter the socket as soon as it is released, and the tool-holder will then be held against rotation in the groove provided on the top of the base 1. Invorder to prevent any rattling and all vertical movement of the tool-holder during the turning operation, the bolt 26 should be screwed down, so as to clamp the member 14 against the base 3. If when the tool is in desired position to engage the work one of the sockets 16 is not in position to be engaged by the locking-bolt 16, the clamping-bolt 26 may be employed to hold the movable member 14 in the desired position without aid from locking-bolt 16a. lVhen, as is sometimes the case, it is desirable to move the member 14 so as to shift the tool during the turning operation, the locking-bolt 16*1 may be kept out of engagement with one of the sockets 16 and the clamping-bolt 26 loosened just suiiicient to permit the member 14 to be rotated on the base 3. by means of the handle 31, which may be screwed into one of the sockets 30 provided on the outer surface of movable member 14.

As the tool-sockets 19 are disposed radially from the center of the member 14, all the tools supported in said sockets may be presented to work at the same inclination, thus making it unnecessary to shift the position of the toolholder on the rest in order to change from IOO one tool to another at the end of each step in the turning operation.

It will be observed that by mounting the movable toolsupporting member 14 in a groove upon the Lipper surface of the base 3 and providing the locking-bolt 16 and clamping-bolt 26 an extremely rigid construction is obtained, as the lateral movement of member 14 in any direction is prevented by the flange external to the groove on the base 3, and rotary and vertical movement of the member 14 are prevented by means of the locking-bolt and clamping-bolt, respectively.

Having thus described the construction and operation of my invention, what I claim as new, and desire to secure by LettersIatent, is

1. The combination in a device of the class described, of a rest, a base secured upon said rest and presenting on its upper surface an annular groove surrounded by an upwardlyprojecting rim, a toolsupporting member seated in said groove, retractable members provided in said rim for securing said toolsupporting member' in said groove for rotation therein, and removable means for ciamping said tool-supporting member upon said base, said tool-supporting member being susceptible or' removal from said base when said clamping means and the securing means mounted in the rim are disengaged therefrom.

2. The combination in a device of the class described, of a rest, a base upon said rest having a central opening, a boit having a head engaging the rest and having in its upper end an internally-threaded socket, a nut threaded upon the upper end of said bolt to secure said base in position, a toolesupporting member rotatably seated on said base and having' a central chamber to receive the upper end of JOHN S. HENRY.

Vitnesses:

CHARLES H. GARITY, Josemi F. LEM-IY.

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