US1732880A - Method of forming apertured plates - Google Patents

Description

Oct. 22, 1929. c. P. EISENHAUER METHOD OF FORMING APERTURED PLATES Filed July 21, 1927 Fig.1.

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m YA E P 3 w R m 0 Patented Oct. 22, 1929 i UNITED STATES PATENT OFFICE CHARLES P. IEISENI'IAUER, OF DAYTON, OHIO, ASSIGNOB TO THE DURO COMPANY, OF

DAYTON, OHIO, A CORPORATION OF OHIO METHOD OF FORMING APERTURED PLATES Application filed July 21,

My invention relates to a method of forming apertured plates.

It is the object of my invention to provide a method of forming an apertured plate and a resulting plate in which the plate will have formed extremely fine slots therein.

Heretofore it has been impossible to form a plate with extremely fine slots due to the fact that the thickness of the cut-ting implement to cut the slot provided an irreducible minimum of diameter of the slot. Such cutting implements at best are very delicate and incapable of quantity production to form foraminous bodies.

It is my object to providea resulting foraminous plate by my method hereinafter described.

Referring to the drawings:

Figure 1 is an edge View of a plate which is used for stock.

Figure 2 is a section showing the result of the first operation of pressing the metal outwardly causing it to tear along a given line.

Figure 8 is a section showing the outwardly pressed portion condensed and pressed back upon its own axis.

Figure 4: is a section showing the pressedout portion which has been so condensed re stored to its original horizontal position so that a very narrow slot has been formed witlv out the use of any cutting or punching tool.

Figure 5 is a diagrammatic view of the punch and dies utilized for this operation showing them in position to act upon the metal as it is formed in Figure 2 to bring about the results in Figures 5 and 1.

Figure (3 is a view of a plate showing the slots made according to the present method.

It will be understood in referring to the drawings that the particular diagrammatic illustration of the punch and die to be utilized is for illustration only and that any desired form of mechanism may be employed for carrying out my method.

This method consists of the following steps:

I first take a sheet of metal designated 1 and punch out a portion designated 2, fracturing it or tearing italong the line 3 by the outward pressure on the portion 2. I do not 1927. Serial nofeozesa use any means of cutting the metal, merely relying upon the pressure of the punch and a supporting mandrel (not shown) beneath the portion 1 to cause a severing of the metal along the line of shear.

I then apply pressure to the face 5 of the portion 2 to reduce the overall length of the left-hand half of the plate preferably condensing the metal by reason of the pressure applied at 5 in the area generally designated 6. I then restore by suitable pressure the two halves of the sheet so that they are on the same plane with one another, as in Figure 1, leaving between them a very narrow slot designated 7, the size of which is exaggerated in the drawing.

This invention may be performed by different means and different devices may be used for that purpose. There is shown in the accompanying drawings, in Figure 5, a preferred form for carrying out the purposes and the results and steps of this invention.

In this figure there are shown two stationary supports, indicated by numerals 18 and 19, which afford a horizontal surface for supporting the plate to be operated upon. This plate in this figure is indicated by the numerals 41 and 17.

Situated above the stationary supports 18 and 19 are two yielding die members, indicated by the numerals l2 and 16. These die members are resiliently held in engagement with the upper surface of the plate and cooperate with the stationary supports 18 and 19 in holding the plate during the process of operation.

These stationary supports 18 and 19 and the yielding die members 1.2 and 16 are situated adjacent each other in such a way as to provide a space for the guidance of a die member 8 and a punch member 15.

The upper surface of the die member 8 is inclined as indicated by the numeral 10, and has on one edge thereof a cutting edge, indicated by the numeral 8. This die member 8 is adapted to move up and down between the stationary supports 18 and 19, and when the plate is located in the position shown in Figure 5 and the die 8 is forced up, the cutting edge 8 engages the plate the numeral 3.

As a part of the plate 2 is pushed upward it passes by a lip 13 on the yielding die member 12. This lip 13 is located so that the free edge of the plate 2 will just pass it and partly smooth the torn edge of the pressed-up part 6. lVhile the die 8 is being pushed up to make a slot in the plate, the punch 15 rises, all the time resting upon the upper surface of the part of the plate immediately over the die 8.

After the plate has been punched to the form shown in Figure 5, the plunger 15 is forced down to cause the struck-up part of the plate to be forced in line with the original part of the plate, and being thus forced down, the end of the struck-up part of the plate 2 slides over the lip 13 and is in sliding thereover further compressed lengthwise and made smooth and somewhat reduced from the original size so that when the parts are in line with each other again there is a small opening between the surface, indicated by the numeral 3, and that of its corresponding part that has been struck up.

The lip 13 forms with the yielding die member 12 a notch, as is clearly shown in Figure 5. The first operation of part of the plate is struck up, as indicated in Figure 2, leavingthe edges torn or serrated. WVhile the plate is struck up by means of the cutting edge 8 the parts are not cut or severed, but are really broken or torn apart, leaving the'edges roughened, as indicated in Figure 2.

However, the continued rising of the die member8 causes the surface 3 to become more or less smooth, due to the action of the die on the broken surface, and when the direction of the die and the punch is changed so that the punch bears upon the part 2 of the plate, the serrated or cut edge passes over the part of the lip 13 and is smoothed and compressed and somewhat reduced so that when the part 2 of the plate is brought into line with the plate 4:, as shown in Figure 5, the severed parts leave a very small opening.

The purpose of this device is to cut or form in sheets of metal small openings for the purpose of draining and forming plates that act as sieves. A device of this kind is especially useful in softening water, where the hole must be sufficiently large to permit the passage of water but to prevent the passage of salts or solids supported by a screen or. plate constructed in the method here defined.

It will be understood that I desire to comprehend within my invention such modifications as may be necessary to adapt it to varying conditions. and uses.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a method of forming a slotted plate, pushing a portion of the plate outwardly to shear it from its adjacent portion, applying pressure to the exposed end thus pushed out, and restoring the pushed-out portion to its former level in the plate and at the same time pressing the face of the pushed-outportion whereby a slot is formed between the end of the pushed-out portion and the portion of the plate from which the pushed-out portion was sheared.

2. In a method of forming a slotted plate, moving one portion of the plate with respect to the other to cause such portions of the metal to shear and separate, and simultaneously condensing and returning the portion so moved to its initial position adjacent to the portion from which it was sheared to form a slot therebetween.

3. In a method of forming a slotted plate, yieldingly holding said plate in position, pushing out a portion of the plate to cause a shear along the line, and simultaneously forcing the sheared portions away from one another and restoring the sheared portions to their initial adjacent positions in the same plane.

4. In a method of forming a slotted plate, rupturing the metal along a given line, and simultaneously spreading and restoring the ruptured parts to their initial plane.

5. In a method of forming a slotted plate. shearing one portion of the plate with respect to another by moving one portion thereof laterally with respect to another, and simultaneously applying pressure to the edges of the sheared portions and restoring the sheared portions to their initial plane, whereby the faces of the sheared portions are adjacent to one another.

In testimony whereof, I ailix my signature.

- CHAS. P. EISENHAUER.

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