US329094A - Machine for making springs - Google Patents

Description

2 Sheets-Sheet 1.

O. K. STINSON.

MACHINE FOR MAKING SPRINGS.

(No Model.)

N0. 329,094. Patented 001;. 2'7, 1885.

(No Model.) 2 Sheets-Sheet 2. O. K. STINS'ON.

MACHINE FOR MAKING SPRINGS. No. 329,094. Patented Oct. 27, 1885 NITED' STATES PATENT MACHINE FOR MAKING SPRINGS srncrr'IcA'rIoN forming part of Letters Patent No. 329,094, dated October 27, 1885.

Application filed April 5, 1883. Serial No. 90,666. (No model.)

To aZZ whom it may concern/.-

Be it known that I, CHARLES K. STINSON, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Spring-Forming Machines; and I do hereby declare that the same are fully described in the following specification, and illustrated in the accompanying drawings. 7

The object of this invention is to provide a forgingmachine adapted to transform a heat- ,ed metallic bar into an article having internally the general shape of the exterior of the reciprocating former, and externally the gen eral shape of the working-face of the'dies or jaws, and also, to out said bar to proper lengths, and to punch holes therein, if required.

The machine illustrated in the drawings is designed particularly for the formation, from steel-bars, of C-springs, such as are used in the well-known Eureka wringer. Provision is made for cutting lengths from long bars and punching holes therein; but it isobvious the machine may be used to shape bars previously cut and punched. l

In the drawings, Figure 1 is a plan of the machine with part of the bed broken away, showing the position of the former at the middle of its stroke. Fig. 2 is a side elevation of the machine; Fig. 3, a top view of part of the machine, with the top plate and parts borne upon it removed and the former near its most advanced position, and the remaining figures are details which .will be explained.

The bed A of the machine is a heavy forging or casting mounted on a suitable frame or legs, 13, supporting the main shaft 0, fly-wheel D, and pinion E. A train of gearing, either above or below the bed, gives motion at a greatly-reduced speed to a vertical shaft, E, which carries an eccentric or crank, G, serving to actuate the pitman H, and thereby to reciprocate the former I and the carriage J, on which it is mounted, in horizontal ways K.

It is obvious that equivalent means of effecting this reciprocation may be employed.

The mechanism for feeding, cutting off, and punching the bar will next be described, and its operation explained as it will occur when long bars are submitted to theaction of the machine. The bars will be drawn from a furnace at a red heat, or will be heated by blowpipes or otherwise, as they advance, so'as to be readily worked.

The bar TV enters the machine through a A guide or guides, at, which insure a true horizontal direction of movement. It is seized and carried forward through spring-clamps y y to an adjustable stop,o, by means of a pair of geared feed-rollers, b 1), shown as driven The means provided for thus stopping the feed consist of a swinging arm, 0, pivoted at its inner end to the top plate, d, of the machine, and furnished at its outer end with upper and lower bearings, e e, for the yielding roller. This arm 0 rests on the plate d, and swings in the arc of a circle described from the pivotf. A push-bar, r, advances with the cutter and punch, and throws back the arm a and its roller, stopping the feed just as the cutting and punching begin. movement of this push-bar restores the roll to place and renews the feed. I

A hand-lever, u, on the plate d, linked to the arm 0, serves to separate the rollers b, so that the bar may enter, or to stop its feeding in any emergency. A spring, 9, tends to return the arm and yielding roller to place; 7, U

The cutter h, which severs a given length of bar, and the punch 'i, which perforates the succeeding length, are actuated in ways'by a pitman, 7c,and an, eccentric on the countershaft j, which has a semi-rotary movement in its bearings. This counter-shaft has a crank, Z, linked by a pitman, m, to the carriage J of the former I, and hence the movements of the counter-shaft and parts actuated thereby are in unison with those of the former.

The puncht works through a guide-plate, a, pressing the bar against a die,o, having a discharge-channel leading downward for the punchings. The cutter works in conjunction with a removable cutter-block, p, which sup- The reverse IOC ports the bar while being cut, and which, like the die is supported against/the thrust by a solid ledge, q, raised from the bed of the machine, to which ledge these parts are bolted.

5 The guide-platen is likewise solid with the bed.

The purpose of the reciprocating stroke of the former I is to bend the bar W and carry it in a bent condition forward between the jaws L as their inner ends also advance and approach the sides of the moving former to give the desired shape to the bar by a most powerful pressure upon it between the former and the jaws.

1 To meet the requirements of the case special strength and efficientsupport are necessary, an d have been provided as follows:

The bed A of the machine is widened at the front end to form two wings, M, Figs. land 3. The central parts of these wings and of the bed are recessed to receive the jaws L and permit of their required movement upon the bottom of therecesses. Each jaw, therefore, has asolid support beneath it, and a solid bearing, M, at its outer end, formed integral with the bed itself, and hence adequate to resist immense strains. ities of the jaws serve to retain themin place, but do not bear the principal strain, and may 0 be dispensed with.

The first function of the jaws in the operation of the machine is to resist the bodily forward movement of the heated bar when the former Iadvances, or, in other words, to

5 remain for a time stationary and bend the bar around the front end and along the sides 'of the advancing former. This action of the jaws and their subsequent movement to close in and press the bar firinly against the former at the proper time iseffected in a very simple manner, as follows: The carriage J, on which the former is mounted, has at each side a groove, .1, running for some distance parallel to the line of movement, then turning inward on a bevel or curve, as at J. The under -side of each jaw has a cylindrical pin or projection, L, (see Fig. 6,) in position to enter and traverse this groove. When the former begins to advance, these pins are in the straight part of the grooves, and neither jaw can advance until the carriage has moved far enough to bring the curves J to the pins,

when the further movement necessitates their ]?iv'ots N at the extrem isremoved by withdrawal of the former, or if it should cling to the former it is forced off by the descent of the next straight bar from the plane in which it enters down to its position in front of the former. This movement is insured by the bell-crank finger P, pivoted above the rearmost position of the former, so that its short arm is struck by the heel of the former as it recedes, bringing down the long arm at the right moment in front of the former to carry the straight bar down to its place and displace the shaped piece.

A spring, P, serves to raise the lever P when its work is done, and, as shown in Fig. 5, may form the prolongation of the lever which comes in contact with the bar to depress it.

The spring-clamps y y, through which the bar advances, have flaring mouths to receive it, and are open at the bottom that the bar may be readily forced downward to place by the finger P or equivalent means.

I claim as my invention 1. The jaws L, each having the projection L, in combination with the reciprocating former,and its carriage,provided with grooves in which such projections engage, substantially as and for the purposes set forth. I

2. The pivoted arm 0, push-bar 1", and spring g, in combination with the feed-rollers bb, substantially as and for the purpose set forth.

3. The spring'clamps 3 3 opening downward, having flaring mouths, andadapted to receive and hold the bar temporarily, for the purpose set forth. A

4. The bell-crank lever P, and spring P, adapted to depress the bar WV at the desired moment, for the purpose set forth.

In testimony whereof I hereto affix my signature in presence of two witnesses.

' CHARLES K. STINSON.

Witnesses:

A. H. SPENCER, E. A. PHELrs.

ICO

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