US251322A - gilkerson - Google Patents

Description

(No Model.) C

J. VANDENBURGH 8v J. A. GILKERSON'.

`SCREW CUTTING MACHINE. v

Patented Deo. 20,1881.-

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UNITED STATES PATENT OFFICE.

JESSE VANDENBURGH AND JAMES A. GILKERSON, F COR'ILAND, N. Y.

SCREW-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 251,322, dated December 20, 1881.

Application filed June 30, 1881. (No model.)

To all whom it may concern Be it known that we, JEssE VANDENBURGH and J AMES A. GILKERsoN, citizens ot' the United States, residing at Cortland, in the county of Cortland and State ot' New York, have invented certain new and usefulImprovementsin Screw-Cutting Machines; and we do hereby declare the following to be a full, clear, and exact description ot" the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters or tgures of reference marked thereon, which form a part of this specitica tion.

In said drawings, Figure 1 represents a central longitudinal section of the die-carriers, supports, and actuating mechanism, showing the details of construction, combination, and adjustnient which are .peculiarities of our invention. Fig. 2 represents an end view of the chuck or sectional die holders or carriers. Fig. 3 represents a plan view of some of the iinportant parts, and Fig. 4 represents in detail the construction of the actuating clutch-lever.

In the several figures the same letters of ret'- erence indicate like parts.

Our invention relates more particularly to cutting threads upon bolts and rods, and its object and purpose is to do the same easily and readily and allow the bolt or rod to have its thread cut and the dies to be disengaged therefrom without running them back off the thread so cut; and our invention consists in the arrangement and combination of the herein described and shown mechanism, whereby the foregoing objects and purposes are accomplished.

We now proceed to describe in detail our invention with reference to the said drawings.

A represents the hollow mandrel, to which power is applied through the medium of the pulleyr B, which runs loose upon the mandrel when the dies are not doing labor. The front side of the hub of the pulley has clutch-teeth, which engage in the cam and clutch-sleeve C, which slides on the mandrel A, and is guided by the feather-key or spline D. This sleeve C and the hub of pulley B are both inclosed, and run inthe front or main bearing, E, thereby preventing the noise which would be produced if the clutches were not covered, and also excluding all particles ot' dirt and chips, which would get in and hinder the free working ot' the machine. Upon the end of the mandrel A is the tlange or face-plate F, either forged solid or fixed thereto, to which fiange the die carriers G are pivoted by means of' a screw stud or rivet, H, each carrier having in the opposite end a pin, I, which, engaging in the cam or angular slotJ inthe cam-plate K, fastened to theclutchsleeve C, form the mechanism'by which the adjustments are made. rlhe dies L are fastened substantially to the carriers G in any suitable manner; or they may be made a part of and solid with the carriers G, it being immaterial how they are made, as long as they form a part'ot and move only in direct connection with the sectional carriers G.

The operation of the machine is substantially as follows: The drawings represent the machine in readiness to work the clutch-sleeve C, being engaged in the clutch upon the hub ot' the pulley, and the pin Ibeing in the straight .partofthecam-slotJ. The blank being brought up to and pushed into the threading-dies L, it is drawn into them and threaded'until the required length ofthread is obtained, when, either by an attendant or by automatic mechanism, the sleeve() is moved toward the head or ange F, causing the 'cam-slots to move the pins I, thereby causing the carriers G to open, relieving the screw, when it is drawn out of the dies. The next operation isto throw the clutch which closes the dies into gear and repeat the operation.

It will be noticed that when the dies are in position for operation the strain all comes upon the side of the straight part of the slot J, and to compensate for the wear upon this part, it being the only point with which wear will cause any variation in the size of the screw when threaded, the dovetailed piece M, made ot' hard steel, is fastened into the plate K, and may be replaced by another at a tritling cost. There being no motion between the pin I and the dovetailed piece M when the dies are working, there will be very little wear on either ot' them.

Now, for operating the clutch and cams the lever and ring shown in Fig. 4 are used. W

IOO

represents the lever, and P and Q the ring,

VWheel may be substituted for the pulley B,

Which latter is made substantially as follows: The pieces for the ring Q and P are made in separate sections, which unite through the bosses or hubs R, and are fitted together and riveted. It is then bored out to fit the groove S, turned into the clutch-sleeve C, and an oilhole, T, is drilled longitudinally through one of the bosses It, for the purpose of supplying oil to the groove S in the clutch-sleeve G, said bosses being turned to fit holes which are drilled into the ends of the lever-arms N and O, which, when put together, form the bifurcated lever XV, which nieves the clutch-sleeve C, and at the same time operates the adjustment ofthe dies and die-carriers Gr.

It is obvious that aeluteh-lever and ring` made in this manner will save a great deal in cost and Wear, as it reduces the parts to the least possible number and saves much time and labor in construction. U is a bearing, which supports the back end of the mandrel A, and VV are thrust-collars, which hold the mandrel and keep it from moving endwise through the pulley-huh B and bearing U.

For obtaining variations of speed a gearhaving a hub made similar to the pulley-hub and driven loy a counter-shaft having a conepnlley upon it.

Having described our invention, what We claim as new, and desire to secure by Letters Patent, is

l. The cutting-dies and carriers and the carrier-shifting cams, combined with mechanism G I, 85e., for moving said cams and throwing the cutting-dies in or out of operation as the carriers are thrown in or out of connection with the power, as specied,

2. The plate K, having the dovetailed hardened Wearing piece M, combined with the clutch-shifter and the die-carriers, as and for the purposes set forth. e

3. The plates K, having inclined slots J, the Wearing-pieces M, and pins I, combined with the clutch, clutch-shifter, the diecarriers, the dies, and the power-shaft, as and for the purposes set forth.

In testimony whereof we aflix our signatures in presence ot' two Witnesses.

JESSE VANDENBURGH. JAMES A. GILKERSON. Vitnesses JOHN W. SUGGETT, EMrLUs GURLEY.

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