US17707A - Die-stock - Google Patents

Description

UNITED sTATEs PATENT oEEioE.

JAMES TEACHOUT, OF VVATERFORD, NEXV YORK.

DIE-STOCK.

Specification of Letters Patent No. 17,707, dated June 30; 1857.

T o all whom it may concern:

Be it known that I, JAMES TEAcHoU'r, of Waterford, in the county of Saratoga and State of New York, have invented a new and improved screw-cutting die-stock of that class in which all the dies used, whether two, three, or more, are simultaneously and equally slid in a radial direction within the die-stock in tightening them on a rod or bolt they may be cutting; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being h ad to the annexed drawings, making a part of this specification, in which- Figure 1 is an isometrical projection of a die-stock made according to my invention-w a part of the guard-plate E being broken away; Fig. 2 a longitudinal section of the entire stock; Fig. 3 an isometrical projection of the central portion of the die-stock; the scroll-plate D, by which the screw-cutting dies C are operated and the guard plate E being both removed; Fig. 4 a plan of the scroll side of the plate D; Fig. 5 a central cross-section of the scroll-plate; Fig. 6 an isometrical projection of a wrench which may be used in turning the scroll-plate7 and in turning the buttons a, a', by which the guard-plate is held to the stock in such a manner that it can be easily removed; Fig. 7 an isometrical projection of one of the screw-cutting dies C; Fig. 8 an isometrical projection of the die-holder B, when made so that it can be removed from the stock A, and Fig. 9 an isometrical projection of the central part of the stock A, when thus made separate from the die-holder.

The same letters refer to like parts in all the figures.

I prefer to make the dies C of my improved die-stock of the rectangular form represented in the drawings; but dies which may be slid endwise of some other angular forms may be used. The stock A and the dieholder B may be made separate so that the die-holder can be removed from the stock, as shown by Figs. 8 and 9, or they may be cast together in one piece; but in either case the die-holder is and must be so formed as to give firm support to the bottom b, to the sides c, and to only the front or inner part d of the top of that ortion of the dies within the ways in the ie-holder; and the dieholder thus made is and must be either all cast in one piece or formed of parts firmly united together. And also, the dies when thus formed and held in the stock are, and must be, all simultaneously slid inward together to tighten them, and also outward to loosen them upon the rod or bolt they may be cutting by means of a scroll or cam plate acting against a lug, e, or its equivalent, formed upon or in the outer or back part of the top side of each die which plate D is and must be so formed and held by a removable guard-plate E or its equivalent that it can be turned about the hub f of the dieholder as a center by means of a lever inserted within radial grooves g in its top side, or by some other similar arrangement; and that it (the scroll plate) shall, in forcing the dies inward, give firm support to the back or outer portion of the top of the dies; and that the scroll plate can be quickly removed from the stock to change the dies when necessary.

The manner in which the stock A; and the die-holder, B, when made separate, are formed so as to have suflicient strength and to fit together properly, is apparent from the drawings; and when the stock and the die.

holder are cast together their combined structure may then be the same that it would be if the loose die holder B was brazed in its place within 'the stock. When the die holder can not be separated from the stock to change the dies7 I prefer to arrange the dies so that all their outer ends are opposite to the rim h, and to then continue the ways for the dies through the rim, as is indicated by the dotted lines at t in Fig. 9; so that the dies can be changed by sliding them out and in at the o en outer ends of the ways, the

same as w en the die-holder is removed from the stock; instead of making the stock larger and changing the dies through the opening in the top of the ways as must be done if the rim h is whole and the die-holder and stock are fast together.

Instead of the lug e, a groove may be made in and across the top of each die, to fit the scroll or cam in the plate D when correspondingly varied; and, instead of making the scroll of the plate D with 2 or more convolutions, it need have -but one; or there may be a separate cam groove or feather for eac die.

I am aware that the dies, in stocks of the class to which mine belongs, have been heretofore slid radially inward and outward together, by means of a scroll or cam plate acting against lugs uponV or within grooves in, the top side of the dies, in the same manner that the dies in my improved stock are slid radially inward and outward; but l believe, that in such cases, the inner portion of the top side of the dies,-where the greatest upward strain is exerted by the dies in cutting screws, and Where the dies should have an unyielding support, are only sustained by the removable guard plate, or the loose scroll plate held by the guard plate;- the scroll plate being thus subjected to much friction and consequentrwear, and the guard plate to great strain, while the dies are but poorly held in their places for cutting Screws accurately.

JAMES TEACHOUT.

Witnesses:

i J. H. CUDwoRTH, AUSTIN F. PARK.

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