US806996A

US806996A - Screw-cutting lathe.

Info

Publication number: US806996A
Application number: US26472405A
Authority: US
Inventors: Anton Schuermann
Original assignee: MUELLER Manufacturing CO H
Current assignee: H MUELLER MANUFACTURING Co; MUELLER Manufacturing CO H
Priority date: 1905-06-10
Filing date: 1905-06-10
Publication date: 1905-12-12
Anticipated expiration: 1922-12-12

Description

No. 806,996. PATENTED DEC. 12, 1905. A. SCHUERMANN.

SCREW CUTTING LATHE.

APPLICATION FILED JUNEIO, 1905.

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No. 806,996. v PATENTED DEC. 12, 1905. A. SGHUBRMANN.

SCREW CUTTING LATHE.

KPPLIGPJI'ION IILED JUNE 10, 1905.

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PATENTED DEC. 12, 1905. A. SGHUERMANN. SCREW CUTTING LATHE.

APPLIOATION FILED JUNE 10, 1905.

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A. SGHUERMANN.

SCREW CUTTING LATHE.

APPLIOATION FILED JUNE 10, 1905.

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Inventor,

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ANTON SOHUERMANN, OF DECATUR, ILLINOIS, ASSIGNOR OFONE-HALF TO H. MUELLER MANUFACTURING COMPANY, OF DECATUR, ILLINOIS,

A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented Dec. 12, 1905.

' Application filed June 10, 1905. Serial No. 264,724.

To all whom, it may concern:

Be it known that I, ANTON SCHUERMANN, of the city of Decatur, county of Macon, and State of Illinois, have invented certain new and useful Improvements in Screw-Cutting Lathes, of which the following is a specification.

The object of this invention is to provide means whereby the thread-cutting tool may be moved slightly faster or slightly slower than the regular motion of the tool-rest, so that the lathe may be used for either inch measure or metric measure and so that shrinkage of cut threads through tempering or otherwise may be compensated for or anticipated. For instance, a tap intended to cut threads of a certain pitch maybe threaded by my machine to the slightly increased pitch needed to neutralize or compensate for the shrinkage resulting from subsequent tempering, or bolts or the like may be threaded to the slightly-reduced pitch needed to conform to holes threaded by taps the threads of which have been shrunk from regular size by tempering.

The mechanism herein described may be applicable to purposes not specifically stated, and it is my desire to patent the invention for all purposes to which it may be applied.

The invention is exemplified in the structure hereinafter described, and it is defined in the appended claims.

In the drawings forming part of this specification, Figure l is an elevation of so much of a screw-cutting lathe as is needed to show the relation of my invention thereto. Fig. 2 is a plan of the mechanism shown in Fig. 1. Fig. 3 is a side elevation of an embodiment of my invention detached from the lathe-can riage. Figs. 4 and 5 are plan details of certain parts of my machine, showing how the motion that retards or accelerates the cutting-tool is developed by travel of the sliderest through inclined-plane action. Fig. 6 is a detail plan of the slotted bar and adjuncts used in developing the variable-speed movement. Fig. 7 is a plan of the under surface of that part of the slide-rest that is accelerated or delayed to vary the pitch of the,

threads. Fig. 8 is a detail of the elements that coact with the slotted bar to develop the variable motion in the cutting-tool. Fig. 9

is a detail of the under surface of the dial plate, which receives motion from the slotted bar through the elements shown in Fig. 8 and imparts it to the tool-carrying part of the slide-rest. Figs. 10 and 11 are plans of my invention, illustrating the action thereof.

Fig. 12 is a plan of the upper element of the slide-rest with the dial-platein place. Fig. 13 is a similar plan with the dial-plate removed. Fig. 14 is a section on lineX in Fig. 13'. Fig. 15 is a section on line X in Fig. 12. Fig. 16 is a detail in elevation of the dialplate and the parts that coact most intimately therewith.

A slide-rest is formed in two

parts

14 and 18. The part 14 is secured to the cross-slide 20 of a tool-carriage of a screw-cutting lathe by bolts extending through holes 15, and it occupies the same position as a. compound swivel-rest. A bar 19 is secured to the tailstock 21 of the lathe, and it extends horizontally crosswise of the lathe, with an edge presented upward. A flat bar 1 is grooved crosswise at one end in its under surface to engage bar 19, as shown in Fig. 1, and it has the oblique groove 2 in its upper surface. A key 3 fits slidably in groove 2. A plate 4 is formed on the upper surface of the key crosswise thereof, and a pivot-pin 5 extends up ward from the center of plate 4. A slide-key 6 is pivoted on pin 5, and it moves in groove 8 of the lower member of the dial-plate. The part 14 of the slide-rest has the gib 14*, which fits slidably in the dovetail groove 18 of part 18 of the slide-rest, and the grooved bar 1 extends slidably lengthwise through the gib. A pair of cover-plates 16 are secured to the gib above the grooved bar on opposite sides of the center of the gib, thus leaving a cross wise travel-space for the slide-plate 4. The upper part 18 of the slide-rest is recessed circularly immediately above the gib, as shown at 18 in Fig. 14, is also recessed circularly in itsupper surface, as shown at 18 is bored centrally of the recesses, as shown at 18, and

is slotted, as shown at 18 A two-part dialplate is used to control the inclination of the pivoted slide-key 6, and this dial-plate is secured to part 18 of the sliderest, with the groove 8 receiving'the key. The upper member 10 of the dial-plate occupies recess 18 and the lower member 7 occupies recess 18*. A pivot extension 9 is formed on the upper surface of member 7, and it pivots in bore 18 The extension 9 is bored and internally threaded, and the u per member 10 has an externally threadecT extension 12, which screws into pivot extension 9. A wrenchseat 11 is formed on the upper surface of member 10, and a screw 13 extends through a hole in the upper member, extends through slot 18 in the slide-rest member, and screws into the lower dial-plate member '7. The dial-plate members are bored centrally, as shown in Fig. 15, to provide an oil-passage leading to the slide-keys.

The upper part of the dial-plate is suitably graduated, as suggested in the drawings, and the screw 13 holds the groove in the lower part of the dial-plate in proper relation to the gradations. The screw 13 also prevents the dial-plate from swinging slide-key 6 into an inoperative position by striking sides of slot 18", and it is used to clamp the parts of the plate onto the slide-rest, with the groove 8 extending in any desired direction.

When the dial-plate is fastened in the posi tion shown in Fig. 12, the pivoting slide-key 6 will be held at right angles with the slotted bar 1, and the device will be inoperative or passive as an accelerator or retarder. When the dial plate is adjusted to the position shown in Figs. 10 and 11, the slide-key 6 will be swung to the position shown in Figs. 4 and 5, and under these conditions the upper part 18 of the slide-rest will advance with relation to the under part 14 to the extent shown in Figs. 10 and 11 as the tool-carriage is moved from one end of its slideway to the other. By turning the dial-plate in the contrary direction the slide-key 6 will be inclined, as shown in Fig. 8, and the tool-carrying part of the slide-rest will be retarded to an extent equal to the advance shown in Figs. 10 and 11. In the conditions above mentioned the set-screw 13 is supposed to be swung to one end or the other of slot 18' or to be located at the center of the slot but the dial-plate may be adjusted in various intermediary positions and the cutting-tool be accelerated or retarded to any required degree.

As the slide-rest moves along the grooved bar 1 the slide-key 3 follows the inclination of groove 2 and moves plate 4 crosswise of,

the slide-rest or crosswise of the direction of the motion thereof. The slide-key 6 travels with the plate 4 across the slide-rest, and when it is set obliquely it forms an inclined plane to convert its crosswise motion into independent motion of part 18 of the sliderest lengthwise of the slotted bar. The mothe slotted bar 1 will slide on bar 19 to permit this movement.

The set-screw 18 is loosened preparatory to adjusting the dial plate, the plate is turned to the required position by means of a wrench applied to seat 11, and the set-screw is retightened.

I claim as new and desire to secure by Letters Patent- 1. In a screw-cutting lathe, the combination of a slide-rest member attached to the carriage, a second slide-rest member movable on the first lengthwise of the lathe and carrying a screw-cutting tool, a plate in the first slide-rest member slidable crosswise thereof, a bar extended along theline of travel of the slide-rest and provided with an oblique groove, a slide-key fixed on the plate in engagement with the oblique groove, a slidekey pivoted on the plate, and an adjustable dial-plate on the tool-carrying member of the slide-rest having a groove in which the pivoted slide-key slides.

2. In a screw-cutting lathe, the combination of a slide-rest member attached to the carriage, a second slide-rest member movable on the first lengthwise of the lathe and carrying a screw-cutting tool, a plate on the first slide-rest member slidable crosswise thereof, a bar attached to the tail-stock crosswise of the lathe, a flat bar grooved crosswise of one of its ends to slidably engage the bar on the tail-stock, and also having a groove extending obliquely along its length, a fixed slide-key on the cross-plate engaging the oblique slot of the slotted bar, a slide-key pivoted on the cross-plate, and an adjustable dial-plate on the tool-carrying member of the slide-rest, having a groove in which the pivoted slide-key slides.

3. In a screw-cutting lathe, the combination of a slide-rest member attached to the carriage and having a gib on its upper surface extended lengthwise of the lathe, a bar fitted slidably in the gib lengthwise thereof, said bar being provided with an oblique groove in its upper surface and held against lengthwise motion, a toolcarrying slide-rest member mounted slidably lengthwise of the lathe on the gibbed member, a plate having motion in the tool-rest crosswise of the travel thereof, a slide-key fixed on the under side of the cross-plate in engagement with the slot of the bar, aslide-key pivoted on the cross-plate, a grooved dial-plate engaging the pivoted slide-key, and means for holding the dialplate in yarious positions.

In testimony whereof I sign my name in the presence of two subscribing witnesses.

ANTON SCHUERMANN.

\Vitnesses:

ANNA MURPHY, JOHN L. VVADDELL.

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