US1967004A

US1967004A - Lathe center

Info

Publication number: US1967004A
Application number: US672483A
Authority: US
Inventors: Daniel G Braden
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-05-23
Filing date: 1933-05-23
Publication date: 1934-07-17
Anticipated expiration: 1951-07-17

Description

July 17, 1934. G. DEN 1,967,004

LATHE CENTER Filed May 23, 1933 fE-V Inventor pan/m G Bra /e 2 flltorney iatented July 17, 1934 UNITED STATES? LATHE CENTER Daniel G. Braden, Staunton, Va.

Application May 23, 1933, Serial No. 672,483

1 Claim.

This invention relates to a lathe center, the general object of the invention being to provide a shell and a center member rotatably arranged in the shell with thrust bearings for the center member and means for adjusting the parts to take up wear.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is an elevation of the invention.

Figure 2 is a longitudinal sectional view therethrough with the center member in elevation.

In these views, the numeral 1 indicates a shell, preferably of hardened steel and ground true and polished and exteriorly tapered to fit a tail stock spindle of a lathe or other machine. The outer end of the shell is enlarged as shown at 2 and threaded to receive a cap 3 which is preferably knurled exteriorly.

The shell is provided with a tapered socket which terminates an appreciable distance from the inner end of the shell, and this end of the shell is formed with a cylindrical bore 4. and a reduced threaded hole 5 which extends from the bore 4 through the end of the shell. The center member is shown at 6, and is tapered to fit the bore and the outer end of the member 6 is formed with a cylindrical reduced part 7 terminating in the point 8.

An intermediate portion of the tapered part of the member 6 is reduced as shown at 9 and the interior of the shell is formed with an annular recess 10 which is in alinement with the reduced part 9 and these parts form an oil chamber and spiral grooves 11 are formed in the member 6 and communicate with the oil chamber, and pass to the ends of the tapered portions of the member as clearly shown in Fig. 2.

The cylindrical part '7 passes through a hole in the cap 3 and Washers 12 are placed in the space between the cap and the outer end of the shell, to prevent escape of oil and also to prevent entrance of dirt or dust. A thrust plate 13 is placed in the inner part of the bore of the shell and anti-friction means 14 are placed between the plate and the inner end of the center member to act as thrust means, and the plate 13 is provided with a stem 15 which extends into the cylindrical part 4 and this stem is engaged by a bolt 16 threaded in the hole 5 and held in adjusted position by a set screw 17 which passes through a laterally extending threaded hole formed in the small end of the shell.

As the center member 5 revolves with the work, there is no wear on the point of center member nor of work and the machinist is not bothered with keeping his center oiled and can concentrate his mind more fully on the work he is doing.

Piston pins and other parts that need to be finished all over can be put in between this antifriction lathe center and the live center of the machine and the friction of the live center against the work will be sumcient to drive it while grinding or taking light cuts of turning.

By means of the adjusting screw any wear of the revolving center or of the ball thrust bearing can be taken up, thus a minimum amount of clearance can be maintained between the revolving center and the outside shell which obviates any looseness or chattering of work while being machined.

By careful workmanship, this anti-friction lathe center can be made absolutely true, and there being no wear on point of centre, it will remain true.

Its running parts are enclosed and running in oil. Therefore it should give long service and it is also small and compact with no bunglesome parts in the way of work etc.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts provided that such changes fall within the scope of the appended claim.

Having thus described my invention, what I claim as new is:-

An anti-friction lathe center comprising a tapered shell having a tapered bore extending from a point adjacent the rear or small end thereof through the front end, said small end having a cylindrical bore therein, the outer part of which is reduced and threaded, a center member tapering rearwardly from a point an appreciable distance from its front end to its rear end, the front part of the center member being reduced and of cylindrical shape and terminating at its front end in a point, the tapered portion fitting in the shell, a cap threaded on the large or front end of the shell and through which the tapered bore and a part of the center member being reduced to form with said recess an oil chamber, and other portions of the tapered part of the member having grooves spiral therein in communication with the chamber, and washers located between the cap and the front or large end of the shell, said washers surrounding the cylindrical part of the center member.

DANIEL G. BRADEN.