US643190A - Lathe bed and apron. - Google Patents

Description

No. 643,l90. Patented Feb. l3, I90 D.

w. LODGE.

LATHE BED AND APRUN.

Applicufibn filed July 27, 1899.;

(No Model.)

NITED STATES PATENT OFFICE.

\VILLIAM LODGE, OF CINCINNATI, OHIO, ASSIGNOR TO THE LODGE (it SHIPLEY MACHINE TOOL COMPANY, OF SAME PLACE.

LATHE BED AND APRON.

SPECIFICATION forming part of Letters Patent N 0. 643,190, dated February 13, 1900.

Application filed July 27, 1899. Serial No. 725,271. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM LODGE, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Lathe Beds and Aprons, of which the following is aspecification.

My invention relates to an improvement in the bed and apron of an engine-lathe by means of which said parts are materially strengthened and rendered more efficient in operation.

The features of my invention are more fully set forth in the description of the accompanying drawings, making a part of this specification, in which Figure 1 is a side elevation of a portion of the lathe-bed with the apron removed. Fig. 2 is a crosssection through the lathe bed and apron, showing my features of improvement. Fig. 3 is an inside end view of stud, pinion, and gear shown in Fig. 2.

A represents the lathe-bed; B, the apron; B, the apron plate, and O the rails or track upon which the apron travels.

E represents the rack on the lathe-bed under the track 0.

For greater clearness of illustration the train of gears constituting the apron mechanism, half-nuts, &c. are omitted from the drawings, the only driving mechanism shown being the particular one selected for the purpose of attaching my improvement thereto.

F represents a spur-gear constituting one of the train of apron-gears receiving speed from the lead screw D. G represents a pinion keyed to this gear-wheel and engaging the rack for driving the carriage. The gear and pinion revolve on a stud H, secured to the apron-plate by the bolt'k. This stud is extended inward to the lathe-bed and carries on its end a rider, boss, or lug I. I cast upon the lathe-bed or otherwise support thereon under the rack and inside thereof a supporting rail or way J, upon which the stud I rests and travels. This rail is extended longitudinally in the path of the apron travel and coextensive therewith. A roller-bearing may be used instead of the boss, if desired. Preferably this stud and boss form a shoulder Z, as shown in side elevation, Fig. 2, and end elevation, Fig. 3, so that this forms arigid bearing on the rail against end thrusts or strain as well as vertical. It is obvious that any stud could be extended inward from the apron-plate to perform this function; but the use of a stud supporting one of the apron gear- Wheels is preferred, as it avoids the addition of superfluous parts.

It is well known that with ordinary lathes when the apron gear-wheel engages the rack on the lathe-bed there is a-constant strain upon the outside plate and a tendency to pry the side of the apron up, caused by the inclination of the pinion to work out of mesh with the rack under strain of work. In such lathes the strain is borne entirely upon the rack and pinion and the weight or the work, as it were, is thrown upon a common pivot afforded by the engagement of pinion and rack, causing lost motion, wearing the parts rapidly and weakening them. With my improved lathe bed and apron the strain is received initially by the pinion carried by the apron and transmitted through the stud to the supporting-rail, so that any strain tending to pry up the side of the apron is taken up by this rail inside of the rack, and so the lathe-bed proper is made to stand the entire strain of carriage travel and work.

This construction produces increased strength, durability, and rigidity of parts, does away with all lost motion, and renders the apron movement entirely true and steady, so that the work is subjected to no vibration as it is presented by the tail-stock to the action of the tool on the spindle.

Having described my invention, I claim 1. In an enginedathe, the combination of a lathe-bed provided with a rack, a sliding apron mounted on said bed, apron-driving devices supported thereon engaging the rack, a longitudinal rail supported on said lathe-bed in the line of apron travel, and a stud-shaft supporting one of said apron-driving devices inwardly projected to and resting upon said rail substantially as described.

2. In an engine-lathe the combination of vice on the end of said stud-shaft engaging a lathe-bed provided with a rack, a sliding said rail, substantially as described. [0 apron mounted on said bed, apron-driving de In testimony whereof I have hereunto set Vices supported thereon engaging the rack, a my hand. stud-shaft supporting the pinion engaging the I WILLIAM LODGE. rack inwardly projected from said apron, a Witnesses: longitudinal rail supported on said lathe-bed OLIVER B. KAISER,

in the line of apron travel, and a bearing de- V. R. WOOD.

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