US 309288 A
Description (OCR text may contain errors)
LATHE matron. No. 309,288. A Patented Dec. 16,1884.
J e I A R e i v r H lul WITNESSES UnTTTn STATES PATENT Trice.
GEOR-G BIRKMANN, OF NENV YORK, N. Y.
SPECIFICATION forming part of Letters Patent No. 309,288, dated December 16, 1884.
Application filed June 18, 1884. (No model.)
To aZZ whom it may concern.-
Be it known that L'Gnone BIRKMANN, of the city, county, and State of New York, have invented certain new and useful Improvernents in Lathe-Chucks, of which the following is a specification.
This invention has reference to an improved lathe-chuck for holding boring-tools and shafts for facing; and the invention consists of a lathe chuck in which a conical sleeve is screwed on the solid or hollow spindle of the lathe, said sleeve being connected by a screwcollar with a cylindrical socket, the latter receiving a number of smaller sockets for holding the shanks of the different sizes of boringdrills, or bushings'of different sizes for holding the shafts to be faced.
In the accompanying drawings, Figure 1 represents a vertical longitudinal section of my improved lathe-chuck, shown with a set of .detaehable sockets for the shanks of the different boring-tools. Fig. 1 is a side View of the smallest tool-socket detached. Fig. 2 is a vertical longitudinal section of the lathechuck arranged to support a shaft; Fig. 3, a Vertical longitudinal section of the same, shown as attached rigidly to one of the tail stocks of the lathe; and Fig. 4.- is an end elevation of the chuck, partly in section on line :v m, Fig. 1.
Similar letters of reference indicate corresponding parts.
A in the drawings represents a conical sleeve that corresponds in size to the diameter of the solid or hollow lathe-spindle S. The conical sleeve A is screwed by an interior screw-thread on the exteriorly-threaded\ spindle S, as shown in Figs. 1 and 2. The conical sleeve is turned off at the thicker end, so as to form a shoulder, a, for an angular screw-collar, O, the threaded forward-extend ing portion of which engages the threaded rear end of a cylindrical main socket, D, that is fitted by its rear end accurately to the conical sleeve A. The inner front part of the main socket D is made cylindrical, and adapted to receive either a set or nest of auxiliary sockets, D D D, of different sizes, which are secured in position byset-screws d d said sockets serving to receive the shanks of different sizes of drills or other boring-tools. The innermost socket, D, has a flattened rear end, which fits into an extension-socket of the next larger socket, D as shown in Figs. 1 and 1, by which the socket D is retained in position in connection with the pressure of the work on the boring-tool without requiring a special set-screw.
When the chuck is desired to be used for facing shafts, one or more cylindrical bushings, E, are inserted into the main socket D, and retained therein by set-screws e, that also press upon the shaft, so as to retain the same in rigid position against longitudinal displacement, while axial displacement is prevented by a collar, E, and set-screw e, the collar E engaging by a lug, e", a recess, 6 of the main socket D. The shaft to be faced in the lathe can thus be rigidly secured to the lathe-chuck and turned with the same, so as to be operated upon by the facing-tool.
In some cases it is desired to arrange the boring-tool in a fixed position on the lathe and conduct the work against the same. In this case the conical sleeve A is screwed upon a solid piece, F, secured to one of the tailstocks of the lathe, as shown in Fig. 3.
The advantages of my improved lathe-chuck are, first, that it can be adapted for use with any size of lathe-spindles by providing conical sleeves A of different diameters; secondly, that it is adapted to perform different kinds of work, such as boring holes of different sizes, facing shafts of different sizes, 85c; and, lastly, that it can be used with any metal-working lathe in common use with little extra expense.
Having thus described my invention, I claim ,as new and desire to secure by Letters Patent- The combination, with a lathespindle, of a conical sleeve screwed therein, a cylindrical main socket fitted to the sleeve, a screw-collar connecting the sleeve and main socket, and one or more auxiliary sockets or bushings screwed into the main socket and adapted to receive different sizes of boring-tools or support different sizes of shafts, substantially as and for the purpose set forth.
. I11 testimony that I claim the foregoing as IOO