US350366A

US350366A - Die for cutting screws

Info

Publication number: US350366A
Authority: US
Publication date: 1886-10-05
Anticipated expiration: 1903-10-05

Description

(No Model.) f

Gr. HOLSTEIN.

DIE POR CUTTING SCRBWS.

No. 350,366. Patented Oct. 5, 1886.

WITNESSES WOR/w? Ys N. PLTERa pmu-unwwplw. wmingwr. D. c;

I UNITED STATES PATENT OFFICE.

GEORGE HOLSTEIN, OE sPUYTEN DUYvIL, :NEW YORK.

on: FOR CUTTING scREws.

SPECIFICATION forming part of Letters Patent No. 350,365, dated October 5, 1886.

Application tiled June 171S6. Serial No. 205,447. (No model.)

'To ail whom it may concern:

'Be it known that I, GEORGE HOLSTEIN, a citizen of the United States, residing at Spuyten Duyvil, in the county of New York and State of New York, have invented new and useful Improvements in Dies for Cutting Screws, of which the following is a specification.

rlhis invention relates to dies for cutting screw-threads; and it consists in certain novel features of construction, which'are full y pointed out in the following specification and claims,

vand illustrated in the accompanying drawings,

in whichf- Figure l is a plan view of myv/die, showing it secured in a wrench. Fig. 2 is a cross section of the same in the planeadas, Fig. l. v Fig. 3 is a bottoni view. Fig. 4 is a horizontal section in the plane g/ y, Fig. 2. Figs. 5 and 6 are views of a modified form of cutting-hub.

Similar letters indicate corresponding parts.

In the drawings, the letter1 A designates the die-plate, which carries a number of radiallyadjustable cutting-hubs, B, which are arranged around a central opening in said die-plate, which will permit the passage of the article on which the thread is to be cut. Each of the hubs B is provided with two or more available cutting-edges, a, and is rmly mounted on a hollow bushing, b, by means of a feather-key, c. In the lower end of this bushing is cut a series of ratchetteeth,, corresponding in number to the number of cutting-edges on thehub, and so arranged that the front face of each such tooth comes directly under one of the cuttingedges. (See Fig. 6.) The ratchet-teeth on the ybushing b engage corresponding teeth, j, cut

into the upper surface of a hollow guide-block, d. -This guide-block rests on a slide, e, which is fitted into a groove, f, in the under surface of the die-plate A.

All the above parts are connected and held together by a screw, g, which passes through the hub B, the bushing bfand the guide-block d, and is tapped into the slide e, the'whole being arranged to be radially adj usted by means of the set-screw h, which is threaded in the die-plate. W'hen the proper adjust-nient for the cutting-hub and the parts connected to the saine has been found, they can be firmly held in position .by tightening the screw g, which serves to clamp the cutting-hub* against the face ofthe die-plate. The threads on the screws g are, by preference, left-handed if the threads Aon the cutting-hub are right-handed, and vice versa.

The cutting hubs B may be either made of one Vpiece of metal, in which the cutting-edges have been formed by'means of grooves or recesses, as shown in Figs. l and 2, or the cutting-edges may consist of inserted cutting blades or chasers,7 as shown-in Figs. 6 and 7, the latter method of construction being preferred where the cutting-hubs are of a larger size and intended for heavy work.

rlhe threads in the cu tting-edges of the hubs are formed by placing the hubs B, into which grooves m have been previously cut, in proper position on the dieplates and tapping the same in the usual way by a tap or thread cutting hub, the advantage of this method being that the teeth thus formed on the cutting-edges of the various hubs will at once be in proper point, and then again tighten these screws.A

To insure the proper placing of the cuttingedges during this operation, I have provided the above-described ratchet-teeth, both on the bushing b and the guide-block el, the relative position of these teeth and the cutting-edges being such as always to insure the most effective position for the cutting-edges.

When desired, all the cutting-edges on the cutting-hubs can be -formed to cut the same thread, so that when one of these edges becomes dull or is broken it can be replaced by turning that hub and bringing one of the other cuttingedges thereon to the cutting position.

If it is found necessary to move all the cutting-hubs toward or from the center simultaneously, any -of the devices generally used in what is known as universal lathe-chucks may be applied to the slides e; but I prefer the form shown in the drawings.

What I claim as new, and desire io secure by Letters Patent, is-

1. The combination, with the dic-plate A and a series of radiallyadjnstable slides, c, of the tubular hubs B, each having a series of available cnttiligedges, and the screws g, passing through the hubs and tapped into the adj ustable slides, substantiall y as described.

2. The combination, with a hub for cutting screw-threads on bolts, said hub being provided with two or more available cutti 11g-edges, of the ratchet-teeth i, formed on said hub, the ratchet-teeth j, and a dic-plate, A, carrying the ratchetteeth j, substantially as described.

3. The combination, with a hub for cutting screw-threads on bolts, said hub being provided with two or more available cu ttinged ges, of the bushing b, ratchettectll 17, formed on said bushing, the ratchet-teeth j, and a dieplate, A, carrying the ratchet-teethj, snbstantially as described.

4. The combination, with a die-plate, A, of4

three or more hubs, B, cach of which is provided With two or more available cutting-edges, and means, substantially as described, for radially adjusting all the hubs on said die-plate, substantially as described.

5. The combination, with a die-plate, A, of two or more cutting-hubs, B, each of which is provided with two or more available cuttingedges, of thc bushing b, ratchetteeth t', formed on said bushing, the guide-block d, ratchetteeth j, formed in said guide-block and adapt- 35