Cushioned die for swaging sheet-metal articles
US 385905 A
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' (NcHodeL) R0. CANNON.
GUSHIONED DIE FOR BWAGING SHEET METAL ARTICLES,
0. 385,905. Patented July 10, 1888 UNITED STATES PATENT OFFICE.
FRED. C. CANNON, OF NEW HAVEN, CONNECTICUT.
CUSHIONED DIE FOR SWAGING SHEET-METAL ARTICLES.
SPECIFICATION forming part of Letters Patent No. 385,905, dated July 10, 1888.
Application filed April 16, IP88. Serial No. 270.811. (No model.)
To (all whom it may concern:
Be it known that I, FRED. O. CANNON, of New Haven, in the county of New Haven and State of Connecticut, have inventcda now Improvement in ])ies for Swaging Sheet-Metal Articles; and I do hereby declare the follownying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-
Eigurc 1, a vertical central section through the two dies and cushion, the dies in position before commencing operation; Fig. 2, the same as Fig. 1, with the swaging operation complete; Fig. 3, a modification in the construetion of the cavity or lower die; Fig. 4, a perspective sectional view of a coach-lamp rellector such as may be produced under this invention.
This invention relates to an improvement in swaging articles from sheet metal.
in the more general practice the dies for swaging articles from sheet metal are prepared the one the reverse of the other, onesay the lower and stationary die-having a cavity the bottom of which corresponds to the outer-surface of the article to be produced. The otherthat is, the upper die or followerhas its under face the reverse of the face of the lower die, and corresponds to the interior surface of the article to be produced, so that the blanlrof sheet metal is forced down into the die and brought to shape'between the working-faces of the two parts of the die; but
in thus swaging the article the surface finish of the metal is unavoidably effected by coming in contact with the surface of the lower die, so that a sheet-metal article thus swaged requires to be finished and burnished after it comes from the die, for if the surface of the blank be first burnished thelustcror brilliancy of the surface will be so much affected by coming in contact with the surface of the lower die that reburnishing is necessary.
The object of my invention is the construction of dies in which the face or outer surface contact with the sheet metal may be ofa non-metallic character, and so that while it will work in conjunction with the upper die,
lug, when taken in connection with aceompa-' to give the required shape, the said non-metallic material will not dctri mentally atiect the surface of the metal; and the invention consists in an iudia-rubbcr resistance or cushion,
adapted to the formation of a reflector for coach-lamps. I
A represents the movable or follower die, the under face of which corresponds to the shape of the reverse side of the rellcctororarticle to be produced.
B represents the stationary die. This die is formed with a cavity corresponding to the outline of the follower-die A, and so that the said follower-die may enter the said cavity;
but the cavity is considerably deeper than the extent to which the followerdie is to enter. This cavity is filled with india-rubber, C, and preferably so that normally the upper surface of the rubber is flush with the upper surface of the die B, and so that as the follower descends it will compress the indie-rubber, the rubber under such compression assuming a shape corresponding perfectly to the face of the follower-die, as indicated in Fig. 2.
The blank from which the reflector or article is to be produced is laid upon the lower die in the proper position, over the india-rubber C. D, Fig. 1, represents the blank thus placed upon the die; then the follower-die dcscends in the usual manner, forces the metal into the die, the india-rubberyieldingaceordingly, and the compression between the follower-die and the rubber causes the sheet metal to assume the shape of the face of the follower-die, as indicated in Fig. 2, it being understood that the movement'of the follower die is to be suiiieient to so compress the rubber that the resisting force of the rubber will be sufficient to bring the sheet metal to the said corresponding shape of the follower-die.
In some cases the central portion of the re flector is spun into shape, and then the surrounding surface struck to shape in dies. In this case the 'india-rubber in the die may be be made in the form of a ring, as indicated in Fig. 3-that is, with a central opening through it ofa diameter corresponding to the already finished central surface of the reflector; then, as he partial ly-formed reflector-blank is forced into the die. upon the indie-rubber ring. the corresponding surface is shaped as before; or the central portion within the ring may presentametal surface corresponding to the required shape of the center, and thisceutral portion may be struck between the follower" and this central portion, of the die, the surrounding portion being shaped. by. the iudiarubber ring. p
In Fi g. 4 I represent an inverted perspective view of one-half of a reflector such as this invention is designed to produce, this illustration showing a diainetrical section of the reflector.
The illustration of the invention as applied to swagiug coach-lamp reflectors will be suffi- -cieut to enable those skilled inthe art to apply the invention to the swaging of other articles, it being understood that my invention is not to be limited to the swaging of any particular article.
By the employment of india-rubberwithin the die as the resistance for the follower the rubber presents a surface to the finished surface of the metal which doesnotdetrimentally affect-it, but,on the contrary, leaves the surface with the same degree of finish as before the swaging operation took place. The metal thereforeen'iploycdin the manufacture of the swaged articles may be highly burnished or plated and burnished, so that when the article comes from the die its surface will be as perfeetly finished as when the swaging first takes place between metal surfaces, and is afterward" face surface of the blank, it prevents the metal from wrinkling, asit willofteu do, when being drawn into surfaces.
I claim- In dies for swagingsh'eet metal, the combi-- shape between two metallic nation of the die or follower A, having its face.
of a shape corresponding to the reverse side of the article to be swaged, and the otherdie, B,
hayiugacavit-y corresponding to said follower,
but of greater depth than the required entrance of the said follower into the said die, with an india-rubber cushion, l, in said eavity to yieldingly resist the entrance of the follower into the die, substantially as and for the purpose described.
FRED. (J. CANNON.
C. E. JONES, WM. W. LYENT.