US648703A

US648703A - Metal-shaping die.

Info

Publication number: US648703A
Application number: US72831099A
Authority: US
Inventors: John G Mcdowell
Original assignee: Individual
Current assignee: Individual
Priority date: 1899-08-24
Filing date: 1899-08-24
Publication date: 1900-05-01
Anticipated expiration: 1917-05-01

Description

Patented Mayrl,I flsoo.

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' wrrNEssEs fh-MW No. 648,703. Patented May I, |900.

A J. G. MGDUWELL.v

METAL SHAPING DIE.

I (Application med Aug. 24, 1599.)

(No Model.) 2 Sheets-Sheet 2.

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UNrTE-Da STATES PATENT' Frison.

JOHN G. IWICDOWELL, OF PITTSBURG, PENNSYLVANIA.

METAL-SHAPING DIE.

SPECIFICATION forming part of Letters Patent No. 648,703, dated May 1, 1900.

Application filed August 24, 1899.y Serial No. 728,310. (N mtlel To @ZZ whom, it ntcty concern:

Be it known that I, JOHN Gr. MCDOWELL, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Metal-Shaping Dies, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- 1o Figure 1 is a side elevation of a pair of dies constructed in accordance with my invention. Fig. 2 is a central vertical cross-section of the same; and Fig. 3 is a plan view, partly broken away, of the lower die.

My invention relates to the punching or shaping of sheet metal, and more particularly to the forming of sheet-metal articles from which projections are struck up in opposite directions; and its object is to provide a simzo ple and effective die system which at a single stroke will punch or strike up both upward and downward projections from the sheetmetal blank acted upon.

In the drawings, in which I show my invenz 5 tion as applied to the making of wall-ties such as shown in my Patent No.620,34c9, dated February 28, 1899, A is an upper reciprocating die, and B a lower stationary die. As

these dies are the same in construction, I will 3o describe the stationary one, similar numerals being applied to corresponding parts of the other.

In the lower die B, 2 is a base-block, provided on each side of its center with a longi- 3 5 tudinal series of cylindrical holes 3, containing punches 4, secured by means of set-screws 5, by which their position may be regulated. This base-block is secured to a backing-plate 6, having a central recess 7, containinga spiral spring 8, acting upon a plunger 9. This plunger is provided with a central rectangular lug or post 10, which projects upwardly through a similarly-shaped slot in the base-block, and to the post is secured a die-block 11, having a series of round holes therethrough, part of which register with the holes in the baseblock, this block 11 being held by a screwholt 12. A clamping and shearing plate or projection 13 is secured centrally to the block 5o 11, preferably by dovetailing, as shown in Fig. 2, and this plate is provided with angular notches 14, which register with the round holes in the shearing-block. To prevent longitudinal movement of the plate 13, I provide pins 15, which'enter notches in such plate 55 and are secured by keys 16. The block 11 is provided with guiding-holes 17 to receive pins 1S upon the block 11 of the other die, so as to keep the dies in proper alinement during the stroke. The punches of the upper recip- 6o rocatory die are arranged alternately with those of the lower die, so that they will enter those holes of the lower die' which alternate with the holes entered by the lower die punches. To prevent scale or dirt, which may lodge on the upper-die block or lower base-block,from changing the extent of movement of the die-block, I form teats or projections 19 upon the lower vbase-block and the rear of the upper-die block. Any scale drop- 7o ping on these parts will lodge between the projections and not interfere with the proper movements.

The operation is as follows: Ablank or strip of sheet metal being laid in proper position upon the lower plate 13, the upper die is moved downwardly. The upper plate 13 first contacts with the blank and clamps it between these two plates. As the motion continues the plungers are pressed backwardly 8o into their cylinders and the punches of the upper die coact with the notched portions of the lower shearing-plate to cut and bend downward projections, while the punches of the lower die have a corresponding action cooperating with the registering notches of the upper plate to form upward projections. These plates 13 are of tempered steel, and their notched portions coact with the angular portions and the punches to shear and bend 9o the edge portions of the blank. As the upper die again rises the plates 13 move forward over they punches and act to strip the blank therefrom, which willrest by gravity on the lower plate and may be removed and another inserted.

The advantages of my invention result from the formation of oppositely-extending proj ections or struck-up portions at asingle stroke of the press and by means of a simple conroc struction of dies which are not liable to get out of order.

Many variations may be made in the form j and arrangement of the punches, as well as in the other parts, Without departing from my invention.

I claiml. In shaping-presses, a pair of dies, each having shaping-punches and a movable plate having holes to receive the punches, each of said plates also having holes or recesses to re- Ceive the punches of the other die; substantially as described.

2. A pair of dies, each having punches, and each having a movable member arranged to receive the punches of both sets of dies; substantially as described.

3. A die having punches,a spring-supported plate having holes receiving the punches, and a cooperating die having punches, the springpressed plate having holes to receive the punches of the opposite die; substantially as described.

4. A pair o f dies, each having punches and each having a movable member containing holes or recesses for receiving both sets of punches, said members having projections arranged to clamp the blank; substantially as described.

5. A pair of dies having projecting punches, spring-supported plates having holes for the punches, and projecting clamping-plates secured to the movable plates and having shearing edge portions to coact with the punches of the opposite die; substantially as described. v 6. A pair of shaping-dies, each having a movable plate or member and projecting lugs arranged to limit the movement of the movable plates; substantially as described.

In testimony whereof I have hereunto set my hand. l

JOI-IN G. MCDOWELL.

Vitnesses:

M. S. MURPHY, G. B. B/LEMMING.