US596405A

US596405A - George e

Info

Publication number: US596405A
Authority: US
Publication date: 1897-12-28
Anticipated expiration: 1914-12-28

Description

(No Model.)

G. E. HART. MECHANISM FOR MAKING TOOTHED RINGS.

No. 596,405. Patented Dec. 28,1897.

' the finished ring.

' UNITED STATES PATENT FFIcE.

GEORGE E. HART, OF WVATERBURY, CONNECTICUT, ASSIGNCR TO THE VATERBURY VATCH COMPANY, OF, SAME PLACE.

MECHANISM FOR MAKING TOOTHED RINGS.

SPECIFICATION forming part of Letters Patent No. 596,405, dated December as, 1897.

A li ation fil d, August 18, 1897. Serial No. 648,709. (No model.)

To aZZ whom it may concern: I

Be it known that I, GEORGE E. HART, o Waterbury, in the county of New Haven, and in the State of Connecticut, have invented certain new and usefullmprovements in Mechanism for Making Toothed Rings; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in Which- Figure 1 is a perspective view of the ringform blank after the notch has been punched in its inner periphery. Figs. 2 and 3 are respectively perspective views from opposite sides of the completed toothed rings. Fig. 4 is a perspective View of the dies and plunger shown separated from each other; and Fig. 5 is a vertical section of the same mounted and in position to operate on the blank shown in Fig. l to complete the ring, as shown in Figs. 2 and 3.

Letters of like name and kind refer to like parts in each of the figures.

The object of my invention is to provide a mechanism for the cheap and rapid manufacture of rings having gear-teeth on opposite sides; and to this end said invention consists in the mechanism characterized by the features. substantially as hereinafter specified.

The toothed ring A that is produced by means of my mechanism is illustrated in Figs. 1 and 2 and has on one side a continuous series of internal gear-teeth a and on the opposite side only two such teeth a, the space between the latter being cut out or a notch a formed clear through to the other side of the ring. In making said toothed ring I make a blank in the form of a plain ring, with a notch a cut in its inner periphery, as shown in Fig. 1. The internal diameter of said ring is slightly greater than in the finished ring, and the external diameter is slightly less than in Said blank is now subjected to the action of dies that simultaneously form the complete set of teeth on one side and the partial set on the other side and finish off the surfaces of the notch. The pressure to which the blank is subjected by the dies to form the two sets of teeth by compressing the metal in an axial direction causes it to expand radially and results in the proper internal and external diameters being given the completed ring, the internal diameter being determined bya cylindrical block or plunger of proper size placed within the ring-blank and the external diameter being determined by an inclosing wall of proper size.

The dies for forming the two sets of teeth are substantially alike, the die B for producing the full set of teeth being a cylindrical body having at one end a circular series of tooth-form projections 12 and b and at its other end a fiangeb, by which it may be fastened, as by screws, to a suitable holder C. The die D for producing a partial set of teeth consists of a cylindrical body of the same diameter as the other die-body and having on one end a projection d, corresponding to the space between the two teeth, and a segmental projection d,wh ose extremities (Z and and d are given such form as to complete the die for said two teeth. Such die D is also flanged at its opposite end and is mounted within'a suitable holder E. Also, mounted within the holder E is a die-ring F, whose internal diameter agrees with the external diameters of the die-bodies and of the completed toothed ring.

Within an axial opening passing entirely through the die B is a cylindrical block G, having a diameter the same as the internal diameter of the finished toothed ring and provided on its side with a longitudinal rib g, that is tooth form in cross-section to receive the-notch a of the ring-blank. The block G projects above the end of the die B, that has the tooth-form projections 19, and is yieldingly supported in such position by means of a coiled spring H, placed within a cavity in the holder C and pressing at one end against the head i of .a plunger I, upon which head bears a stem or shank g on the block G. A flange 9 0n the block G, by engaging a shoulder on the die 13, limits the outward movement of said block.

In the use of my mechanism the blank-ring shown in Fig. 1 is slipped over the projecting end of the block G,with its notch a engaging the rib g, and then the two dies, end to end, are brought together upon the ring, which when the dies engage the same is encircled by the die-ring F. The projecting end of the block G is engaged by the end of the die D, and as the two dies compress the metal of the ring between them as they approach the block G yields before the die D, as itmay by reason of the yielding support afforded it by the spring. As the notch a in the blank is only roughed out, its finished form is given it by the rib 9 when the blank is subjected to the pressure of the two dies, as described, and the proper internal and external diameters of the finished ring are given by the diering E and the block G, respectively, against the surfaces of which the inner and outer peripheries of the ring are forced by the diepressure.

The product of my apparatus is a finished one-piece toothed ring requiring neither cutting, milling, nor latheWork.

Having thus described my invention, What I claim is- 1. In an apparatus for making toothed rings, the combination of a die to encircle a blank, a block to be encircled thereby, and a die having tooth-form projections, to engage the side of the blank, substantially as and for the purpose specified.

2. In an apparatus for making toothed rings, the combination of dies for operating on opposite sides of a ring-blank, having each, tooth-form projections, a die to encircle said blank, and a block to be encircled thereby, substantially as and for the purpose described.

3. In an apparatus for .making toothed rings, the combination of dies for operating on opposite sides of a ring-blank, a die to encircle said blank, a block to be encircled thereby, and a movable support for said block, substantially as and for the purpose described.

4:. In an apparatus for making toothed rings, the combination of dies for operating on opposite sides of a ring-blank, a die to encircle said blank, a block to be encircled thereby, and a yielding support for said block, substantially as and for the purpose described.

5. In an apparatus for making toothed rings, the combination of dies for operating on opposite sides of a ring-blank, a die to encircle said blank, and a block to be encircled thereby, having a rib to engage a notch in the blank, substantially as and for the purpose described,

In testimony that I claim the foregoing I have hereunto set my hand this 9th day of August, 1897.

GEO. E. HART.

Witnesses:

S. L. ARTHUR, CHARLES S. CHAPMAN.