US2337761A

US2337761A - Lathe

Info

Publication number: US2337761A
Application number: US405350A
Authority: US
Inventors: William K Millholland
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-08-04
Filing date: 1941-08-04
Publication date: 1943-12-28
Anticipated expiration: 1960-12-28

Description

Dec. 28, 1943. w. K MILLHOLLAND' Y v.2,337,761

LATHE Filed Aug. 4, 1941 2- Shee'bs-Sheet 1 i INVENTOR. MLA/AM /f M/Lf/ozz/l/VD,

BY /MCV Dec. 28, 1943; w. K. MILLHOLLAND LATHE Filed Aug. 4, 1941 2 Sheets-Sheet 2 7 W KWJMW mw Lf .Efwww Patented Dec. 28, 1943 UNITED STATES PATENT OFFICE 2 Claims.

In the operation of lathes of many types, copious quantities of lubricating liquid are constantly flowed over the cutting tool and it is therefore necessary to provide a liquid-tight basin or pan in position to receive the off-flowing liquid and accompanying metal chips and to separate the liquid from the chips for recirculation.

Heretofore, so far as I am aware, these pans, whether of an integral casting or a welded sheet metal, have been of such form that they were interposed between the base casting and the super-structures of the lathe and consequently it has been necessary to accurately machine the interposed portions of the pan.

A pan formed from an integral casting is commercially impractical because of its. unavoidable weight and because of fabrication losses beginning with a readily recognizable defective casting and ending with castings which break during processing and both in the cases of integral castings and Welded sheet metal structures, the diniculties oi firmly securing the super-structures upon the interposed pan portions result in defective operation of the lathe.

Operating conditions are such that it is necessary at times to remove the pan from the main body of the lathe and where the pan has portions which are interposed between the bed and super-structures of the lathe, diiiiculties are experienced in reassembly of the super-structures upon the bed with that degree of accuracy which is essential for proper operation of the machine.

The object of my present invention is to provide a lathe structure with a relatively light sheet metal pan for the reception of the lubricating fluid and accompanying work chips of such character that it may be made of material considerably lighter than has heretofore been considered permissible and so associated with the bed as to be removable while still permitting ready reassembly of the super-structures upon the bed with the initial degree of accuracy.

The accompanying drawings illustrate my invention.

Fig. 1 is a perspective view of a lathe in which my invention has been embodied;

Fig. 2 a diagrammatic side elevation; and

Fig. 3 a section on line 3-3 of Fig. 2.

In the drawings I indicates the usual bed of a lathe provided with pedestals 2 and 3, the upper faces of which are accurately machined for the reception of the necessary super-structures, i. e., the head stock I3 and tail stock I4.

The pan I5 is a relatively shallow sheet metal structure which is liquid tight and which is provided, at an appropriate point, with a sump I6 having an intermediate screen I'I to catch the work chips and provide a supplemental sump I8 for the reception of the clear lubricating liquid for return flow.

The bottom of this pan in its shallower portions, at appropriate points is formed with upstanding portions 20 and 2l adapted to envelop the sides of the bed pedestals which are provided for the reception of the head stock and tail stock.

These upstanding portions 2i! and 2| are formed at their upper ends to provide inwardlyextending perimetral flanges, such as shown at 22 in Fig. 3, adapted to rest upon the uppermost surfaces of said pedestals to support said pan. Preferably said flanges will be secured in place by machine screws 23 or the like.

The head stock I3 and the tail stock I4 are formed with downwardly projecting platforms 24 and 25, respectively; the perimetral dimensions of which are slightly less than the internal perimetral dimensions of the flanges formed at the tops of the portions 2i) and 2I, so that those platforms t within said flanges and rest upon the accurately machined surfaces 0f the pedestals. The lowermost surfaces of the platforms on the head stock and tail stock are accurately machined to cooperate with said machined surfaces of the pedestals.

As neither the head stock nor the tail stock rests directly upon any portion of the pan, no machining of horizontal faces of any portion of the pan is necessary and therefore the pan may be made of relatively light material and, because the head stock and tail stock rest immediately upon the pedestals of the bed, they may be readily removed and accurately replaced Whenever it becomes necessary to separate the pan from the lathe structure.

I claim as my invention:

1. A machine tool comprising, a base having an upwardly-presented accurately-machined surface surrounded by an upwardly-presented area, a superstructure having a downwardly-presented, accurately-machined surface mating with, and rigidly seated on, said upwardly-presented, accurately-machined surface and surrounded by a downwardly-presented area, the said two surrounding areas being vertically spaced from each other, and a pan having a bottom apertured to encompass said accurately-machined mating areas with portions of the pan bottom immediately bounding the aperture of less thickness than the spacing between said bounding areas and resting upon said upwardly-presented bounding area.

2. Apparatus of the character specified in claim 1, wherein the apertured portion of the pan bottom is raised above the general level of the pan bottom and connected to said general level by a sleeve which sleeves downwardly over that portion of the base which carries the upwardlypresented accurately machined surface.

WILLIAM K. MILLHOLLAND.