US38767A - Improved press for forming dies - Google Patents

Description

l UNITED STATES WAX HENRY STEIN,

PATENT OFFICE.

OE NEW YORK, N. Y.

IMPROVED PRESS FOR FORMING DIES.

Specificatim forming part of Letters Patent No. 38,767, dated June 2, 1863; antedated April 9, 1863.

To all whom it may concern:

Beit known that I, MAx HENRY STEIN, of the city, county, and State of New York, have invented a new and Improved Press for Forming Dies, doc.; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure l represents a longitudinal vertical section of my invention. Fig. 2 is a transverse vertical section of the same, taken in the plane indicated by the line m Fig. 1.

Similar letters of reference in both views indicate corresponding parts.

The object of this invention is to produce dies of an alloy of copper and tin by subjecting said alloy, when in a red-hot state, to a suitable pressure, as fully described in Letters Patent granted to J. J. C. Smith, September 20, 1859, and reissued April l0, 1860. j

According to the description given in said Letters Patent, the die is iirst cast in the proper from, and when cold it is provided with an iron collar, and, together with the matrix, reheated in an oven made and provided expressly for this purpose, and then pressed from one side. The use of the iron collars causes much expense, because they are liable to crack after having been used for the second time 5 and, furthermore, in reheatin g the die surrounded by the collar, and together with the matrix, the following serious difficulties arise: In the first place, it is impossible to decide about the proper heat of the die by the appearance of the red-hot collar, the die being made of copper and Jtin and the collar of iron; and, secondly, the matrix which has to produce the impression of the die is liable to become damaged, for whenever the metal on the surface of the die becomes a little too hot the matrix adheres to it, notwithstanding the use of lamp-black during the operation of pressing, so that the two cannot be separated, and the matrix is lost. Furthermore, by pressing from one side only, the deep portions appear clear and sharp in the die, but particularly with more difficult subjects the edges become rounded, almost Without exception, and it is generally necessary to heat and press the die more than once. These difficulties I have remedied by my invention, which consists in the arrangement of two hingedlevers acting on a vertically-sliding plunger and acted upon by adjustable slides guided by grooves in the inner side of the frame of the press, in combination with two ,arms projecting from the main or upper follower and acting on the adjustable slides, and with an adjustable pressbox, in such a manner that the metal or alloy in the press-box can be subjected simultaneously to a pressure from top and bottom, while at the same time the press-box prevents the metal spreading, and consequently produces a clear and distinct impression on a die of the desired shape and size.

To enable those skilled in the art to make and use my invention, I will proceed to de. scribe its construction and operatlon with reference to the drawings.

The frame A of my press consists of a Q- shaped casting, which rises from a table or bedplate, B. The central portion of said frame forms the nut for the screw C and sockets for two guide-rods, a, and its upper end or head forms a square, b, to receive the hand lever E', which serves to operate the press. The lower end of screw C is fitted into the follower D in such a manner that the screw is permitted to turn freely, at the saine time causing the follower to rise and fall, according 'to the direction in which the screw is turned.

The follower is guided in its up-and-down motion and prevented from turning by two arms, c, the ends of which catch into guidegrooves d in the inner sides of the frame A. As the follower descends,it comes in contact with bars e, that are inserted into the grooves d, and which rest on the outer ends of levers E. These levers are connected to the bedplate B by means of pivots or screwsf, ing through brackets g, which project from tn under side of said platform, and their innerl ends are pivoted to the shank of a plunger, F, so that by depressing thc outer ends ot' said levers the plunger is forced up, and by raising the outer ends of said levers or permitting them to rise, the plunger is made to descend.

The plunger F passes up through a hole in the bed-plate B, and it acts upon the under side of the' secondary follower Gr, so that by depressing the main follower D said secondary follower is raised, and the substance or material which may be placed between these two followers is pressed simultaneously fromV top and bottom. It is obvious that by increasing or decreasing the length of the bars e the action ofthe secondary follower can be made to commence sooner or later, as may be desired.

The secondary follower Gis precisely of the same size with a plate, D,which is secured to the under side of the main follower D by means of a movable pin, h, and both the plate D and secondary follower G tit exactly into the pressbox H. This press-box consists of four (more or less) flat or curved plates, c', that are kept up to the sides of the followers by means of setscrews j, and if the press-box is to be square or polygonal it will be easily seen that by the same plates, z', boxes of different size can be produced 5 butif the press-box is to be circular or composed of curved plates the same sections will produce only one size box, and for different sizes of boxes different plates or sections have to be kept on hand. Itis obvious that for dierent size boxes the secondary follower G and the plate D have to be changed.

The operation is as follows: The pressbox H is adjusted to suit the size of the die to be produced, and the plate D and follower G are selected to match. The follower D is now raised and the alloy is fused and poured into the press-box H, and the matrix or design to be produced by the die, which has been previously fastened to the under side of the plate Dl and heated, is pressed into the alloy after the same has attained the consistency of beeswax, which is the case when its temperature is reduced to the proper point, as described in the Letters Patent of J. J. G. Smith referred to above. By forcing the plate D down the secondary follower rises, and the metal in the box H is pressed simultaneously from both sides. By increasing or decreasing the length of the bars e the pressure exerted by the secondary follower, as compared to that exerted by the main follower, can be regulated at pleasure, so that the substance to be pressed can be subjected to a pressure of one, two, and four inches from below, or vice versa.

By this arrangement a clear and distinct impression can be taken of the most difficult matrixes or patterns by one operation, and the press can be adjusted to turn out dies of from one to twelve inches wide and from a quarter to three inches high.

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

rllhe arrangement of two hinged levers, E

E, plunger F, and bars e, in combination with the main follower D and an adjustable pressbox, H, constructed and operating substantially in the manner and for the purpose shown and described herein.

R. GAWLEY, EDW. W. IiloDGsoN.

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