US189277A - Improvement in metal-drawing presses - Google Patents

Description

0. SMITH.

v METAL DRAWING PRESS. No. 189,277. Patented Apri13, 1877.

M PETERS PHOTO-Lll'iiOGRAPNER. WASHINGTON. I74 1:

4 'SheetsSheet 1.

e-sheets-sheei s. 0. SMITH. METAL DRAWING PRESS.

Patented Apr'113, 1877.

l i '!'hillmlillaz m 0 ll'" N. PETERS FHOTOJJTHOGRAPNER. WASHINGTON. it Q Q 4Sheets-Sheet4Q .0 SMITH.

METAL DRAWING PRESS. N ,189,Z77, Patented Apr i13, 1877.

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inafter set forth.

.UNI'IED STATES I PATENT QFFICE,

IOBERLIIN SMITH, on BRIDGETIQQN, NEWJERSEY.

IMPROVEMENT m METAL-DRAWING P'RESSES.

" Specification forming part of Letters Patent No. 189,277, dated April 3, 1877; application filed i December 5,1876.

' in the State of New Jersey,have invented certain new and useful Improvements in Drawing-Presses; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to'the accompanying drawings, making a part of this specification, in 'whichproved press as arranged for use; and Fig, 2 is a vertical central section of the same upon a line passing from front to rear, and shows the parts in their normal positions.' Fig. 3Qis a like view of said press, its operative parts being in the position occupied after the production of a blank and the drawing of the same. Figs. 4 and'5 are perspective 'views .of

" my die-clamp, the parts being,'respectively, separated from and combined with each other and Figs. 6 and 7 are vertical central sections of said clamp as arranged upon or within the bed-plate of the press.

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

The design of my invention is mainly to combine in a convenient and practicable form a cutting and a drawing press, by means of which the articles to' be formed may-be cut from a plate and drawn to shape by one movement of the foot-lever; to which end it consists, principally, in a press'for cutting and drawing sheet metal, in which the bar that carries thecutting-die is moved positively by the bar which carries the drawing-die, substantially as and for the purpose hereinafter [hereinafter shown.

It consists, further, in the means employed for regulating the movement of the cuttingdie, substantially as and for the purpose here- 'It consists, further, in the m'eans'employed for regulating the downward movement of the drawing-dies, substantially as and for the purpose hereinafter shown and described.

It consists, finally, in the peculiar construction of the die-clamp, substantially as and for the purpose hereinafter specified. In the annexed drawings, A represents'the bed-plate of my press, which is supported upon or by means of three legs, B, and is provided with a central opening, a, for the recep- V tion of fixed or female dies. Figure l is a perspective view of my im- From the rear side of the bed-plate A a standard, 0, extends upward and forward, and within its front side is provided with a vertical dovetail-shaped groove, 0, which receives and contains a bar, D, the latter being'capable of a longitudinal motion within said groove.

Within the rear side of the bar'D, at its transverse center, is provideda rectangular groove, 11, that receives and contains a correspondingly-shaped bar, E, which latter is capable of an independent longitudinal motion withinits said groove.

Vertical motion is imparted to the bars D and E by means of a lever,F, which has its front end contained within vertical central openings'd and e, that are providedin and through said parts, and is pivoted Within a similar opening, 0, in the standard 0, a short distancein rear of its said front end.

From the standard 0 the lever F extends rearward for some distance, and by means of a forked bar, G, threaded bar H, and nuts I and K, as hereinafter described, is connected to'or with the rear end of a foot-lever, L,

same and said foot-lever, will return said parts to their normal positions. If necessary, additional weight may be added to the rear end of said lever F by bolting metal plates F upon opposite sides, as shown in Fig. 1.

The barD is intended to sustain and operate the male cutting-die M, and the, bar E to operate the male forming or drawing die N,

said dies being attached to or upon their lower ends, in consequence of which use it. is necessary that said bar D should move in advance of said bar E, so that the blank may be out from the sheet of metal before said forming die operates upon it.

The desired result is accomplished by constructing the dies so that the forming-die N is contained within a central recess oropening, an, in the cutting-die M, while the female forming-die O is constructed or placed within the bottom of the female cuttingdie P, and then arranging the motions of said bars D and E so that said male cutting-die M shall move downward until it has cut a blank, and holds the same firmly against the top of its female die 0, after which its motion ceases, and said die N continues and presses said blank into and through said die 0.

The relative movements of the bars D and E are eflected' by the following-described means The opening d of the bar D is lengthened, so as to prevent the end of the'lever F (which end is provided with a friction-roller, f) from hearing against the lower end of the same, and a projection, e, which has a forward and an upward curve, is provided upon the front side of said bar E below the lever-open ing 6. Within the lower end of said recess (1 is pivoted a block, Q, which has the general form of a triangle, and is so arranged .as to permit of being turned to the position shown in Fig. 2, with its upper arm q in engagement with said projection e, or of being moved to the position seen in Fig. 3, so asto disengage said parts. When the block Q occupies the position shown in Fig. 2, the downward motion of the bar E will be communicated to the bar D; but when said block is released from engagement with the spur c, said bar E is y at liberty to continue its downward motion without moving said bar D.

The arm q of the block Q is held in engagement with the spur e by means of aspr'ing, m, which is placed below its lower arm q, while said block is tripped, so as to release it from engagement with said spur, by means of a jointed bar, R, which is pivoted at one end to the lower portion of said arm q, and from thence extending upward and outward through i a suitable opening in a vertically-adjustable. support, S, has its outer end threaded and 1 tion is employed:

provided with a nut, r.

When the bars D and E move downward until the jointed bar B is straightened, further I motion of said parts causes said'bar R to draw the arm q of the tripping-block Q forward until released from engagement with the spur 6, while upon reversing the motion of said parts said bar B yields and permits the spring a: to move said block Q into engagement withsaid Splll' 01106 IHOI'Q.

When the bar D has reached the limit of its downward stroke, and is released from engagement with the bar E, it is necessary that the former shouldbe locked in position for the purpose of confining the blank just out between the male cutting-die Maud the upper endofthe female drawing-die O, which result 'is secured by providing upon the lower end,

at the rear side of the block S, a spur, s, that extends rearward and engages with the arm q as the latter passes from beneath the spur e.

The front side of the, spur e bears against the rear side of the arm q when the latter is in engagement with the spur s, and prevents its disengagement from the latter; but as the bar E moves upward said spur 0 passes above said arm, and permits the latter to be moved rearward once more by the spring as.

In order that the downward limit of motion of thebar D of V the cutting-die (which latter also operates as a holding-die) may be varied for the purpose of securing a proper adjustment' of parts, theblock S is bolted to or upon the rear face of a yoke,"l, that spans the front side of said bar D, and at its end is secured rigidly to or upon the standard .0. y A lug, .9, projects forward from the upper end of said block S over. said yoke, and a screw, 27, passes throughs'aid lug into a thread: ed opening in the latter. =By loosening the bolt t, which'confines the block S in'place, said block may be adjusted vertically by the movement of the screw t, the latter being, preferably, swiveled within the lug, s, so as to move {the same in either direction.

In order to compensate for the wear of the tion of said standard. By tightening said screw the groove 0 will be lessened in breadth, and less lateral motion allowed to said bar D.

The foot-lever L is intended to move within certain fixed limits,and in order that the motion of the lever F may be varied at will, the lower 'section Hof the connection between said parts is arranged to be attached at a number of points between the rear end and pivotal bearing of said foot-lever; but as such change in the point of attachment will vary the relative position of said lever F, the following-described construction of said connec- The upper sectionG has itslower end forked, and the ends of said forks connected by means of a horizontal bar, g. Through said bar g passes loosely the threaded upper portion of thelower section H, and upon the end of the latter, above said barg, is loosely fitted a nut, I, while below said bar is placed a second nut, K, which is formed within or of the hub of a hand-wheel. a

By loosening the nut K with the hand, the uppernut I may be turned with the fingers until the proper length of the connection is following-described clamp:

A sleeve, V, having a flattened upper por tion, which is terminated by a projecting flange, v, and a threaded lower portion or body, 22, is looselyfitted within a radial vertical slot, a, in the bed-plate A, and is held in position therein by means of a nut, W,that is fitted over said threaded portion and bears against the lower side of said bed-plate.

Within the sleeve V is loosely fitted a bolt, X, which, at its upper end, is provided with a head, as, that extends horizontally outward from one side, and fits within a corresponding recess, '0, that is provided within the upper end of said sleeve at the side next to the die P. The lower portion of the boltX is threaded, and projects below the sleeve V, and upon such portion is loosely fitted a nut, Y. A nut, Z, constructed in the form of a hand-wheel, is fitted loosely upon the lower portion of said sleeve, below the nut W, and completes the device, the operation of which is as follows:

The clamp-bolt X being in position, the

wheel-nut Z is turned downward, and as it impinges against the nut Y the friction between their contiguous faces will cause the latter to move in the same direction; but as the screw-thread of the sleeve V has a greater pitch than the thread of said bolt, it will be seen that said wheel-nut will move downward more rapidly than said nut Y, and, asa consequence of such differential motion, said bolt will be drawn downward with great force.

Having thus fully set forth the nature and merits of my invention, what I claim as new 1s 1. A press for cutting and drawing sheet metal,'in which the bar that carries the cutting-die is moved positively by the bar which carries the drawing-die, substantially as and for the purpose specified. I

2. The means employed for combining the movements of the bars D and E, consisting of the tripping-block Q, pivoted within said bar D, and provided with an arm, g, which is caused to engage with a spur, e, upon said bar E by the pressure of the spring at, substantially as and for the purpose shown.

3. The means employed for disengaging the bar D from the bar E, consisting of the jointed bar It, pivoted to or upon the tripping-block Q, and connected to or with the block S, substantially as and for the purpose set forth.

4. The means employed for locking the bar D at its lowest point, consisting of the tripping-block Q q and spurs s and e, substantially as and for the purpose shown and described.

5. In combination with the bar D, trippingblock Q, and jointed bar R, the block S, secured to or upon the yoke T, and made vertically adjustable by means of the screw t, swiveled within the lug s, substantially as and for the purpose specified. l 6. In combination with the levers F and L, the connection formed by the forked bar G g, threaded bar H, and nuts I and K, substantially as and for the purpose shown.

7. The hereinbeforedescribed die-clamp, consisting of the threaded sleeves V v 'v, the threaded bolt X E, and the nuts W, Y, and Z, all combined to operate in the manner and for the purpose substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 4th day of December, 1876.

OB ERLIN SMITH.

Witnesses JAMES J. REEVES, E. EQBREWSTER.

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