US1235216A - Sectional scroll-edged shearing-die. - Google Patents

Description

c. D. McDONALD.

SECTIONAL SCROLL EDGED SHEARING DlE,

APPLICATION FILED on. 9. 1916.

I 1 ,235,21 6. Patented July 31, 1917.

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UNITED STATES PATENT OFFICE.

CHARLES D. MCDONALD, OF CHICAGO, ILLINOIS, ASSIGNOR TO MCDONALD MACHINE 00., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SECTIONAL SCROLL-EDGED SHEARING-DIE.

Application filed October 9, 1916.

T 0 all whom it may concern:

Be it known that I, CHARLES D. MCDON- ALD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sectional Scroll- Edged Shearing-Dies, of which the following is a specification.

The present invention relates to a sectional form of die for use in scroll shearing machines, of the general type embodied in Letters Patent of the United States No. 1,174,747, granted to Charles D. McDonald March 7, 1916, and entitled Metal shearing machines.

The primary object of the invention is to produce a die of sectional formation, thereby permitting the construction of a relatively thin die, whereby the cost of manufacturing the same is reduced, and eliminating the danger of the die warping, which is present when an integral thin die construction is used.

Further objects of the invention are, to arrange the die in such manner as to enable any portion thereof to be readily removed for the purpose of repair; and to provide simple and easy means for mounting and maintaining in place a stripper for use in conjunction with said dies.

The invention further consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawings:

Figure 1 is a plan View of a die formed in accordance with the present invention;

Fig. 2, a section on line 22 of Fig. 1, looking in the direction of the arrows;

Fig. 3, a cross section through the die of the present invention, on a somewhat enlarged scale; and

Fig. 4, a perspective of one of the die sections.

In the art to which the present invention relates, there are certain machines which use an elongated, double scroll-edged die for the purpose of shearing sheets of metal into scroll-edged blanks. These machines are of the character shown and described in the McDonald Patent No. 1,174,747 heretofore referred to. 4

These dies are necessarily of an elongated nature, and it has been found that if the die be made sufficiently thick to withstand the action of warping, the cost, due to the Specification of Letters Patent.

Patented July 31, 1917.

Serial No. 124,711.

required use of tool steel in forming the same, would be so high as to make it impractical of employment. If the die be made thin, so as to eliminate the high cost, and at the same time made of an integral construction, then, owing to its elongated character, it has a tendency to warp, and in this particular class of die, a slight warping would be fatal to the production of proper blanks.

In the present invention, the die is formed of a sectional nature, thereby allowing it to be made of a relatively thin piece of tool steel and eliminating the high cost of manufacture, but avoiding the use of the thin elongated strip, which was open to the objection of warping.

Referring now to the drawings, companion backing members 5 and 6 are employed, which may be of any suitable metal and relatively cheap of production as compared with the steel which must be used for the dies. Into the opposed faces of each of the backing members 5 and 6 are inserted scroll-edged die sections 7. .Each of the backing strips 5 and 6 is recessed as at 8 (Fig. 3), and into this recess is inserted the die sections 7. These sections when united produce an elongated scroll-shaped cutting edge 9, thereby producing a double scrolledged die.

The sections are each placed in position by the use of suitable threaded or other removable locking members 11, which extend in a recess 11 in the backing portion, and which recess may be tapped or otherwise formed for removably securing the locking members in place. The opening 12 through the die section is countersunk as shown, to allow the head of the locking member to be inserted therein. Each of the die sections 7 is of suitable length, and when formed in this manner, can be made relatively thin, so as to eliminate the use of an excessive amount of tool steel; and, at the same time, owing to the sectional formation, they are so short as not to warp when tempered. A die, therefore, is thus produced which is of an elongated nature necessary in this sort of work, and which is sufliciently thin to be practical ofmanufacture as to cost, and sufliciently short so that it will not warp even though made of a thin character.

End or cross-cutting dies 13 are employed, which cons s f a block 14 secured, by

means of suitable removable fastening members 15, to a strip 16 removably connected to the bottom face of the base sections; and a side edge trimming die 17 is employed, which is connected by suitable removable fastening members 19 to one of the backing sections and rests on an extension 18 from said backing section.

From the foregoing, it will be apparent that all portions of the cutting part of the die are made in short sections; and are, therefore, capable of being made thin, and at the same time will, owing to their shortness, not be open to the objection of warping. Any portion of the die which should become worn or broken can easily be removed and a new one placed in position without in any way affecting the remainder of the die.

A stripper member 20 is employed, which comprises a block 21, having a beveled face 22 thereon. This block is formed with slots 23, through which extend removable fastening members 2st. A series of stems 25 are secured to the lower face of the stripper bar (see Fig. 3), which stems extend through ashoulder 26 on the backing member 5; and interposed between the upper face of this shoulder and the lower face of the stripper bar is a coil-spring 27 normally holding the stripper bar upward. Suitable removable fastening members 28 are attached to the lower end of the stem 27 for holding it in place.

The slot 23, through which the fastening member 2a extends, is elongated to allow the stripper to move up and down. The fastening member 2A, being of a detachable nature, allows the stripper to be removed at will. The operation of the stripper is evident. hen the sheet of metal in passing across the die strikes the inclined face 20, said face deflects the work so as to prevent it from striking the edge of the die. After the cut is made, the action of the spring 27 forces the stripper bar upward, dislodging the cut metal, and thereby performing the usual function of a stripper. A stripper so constructed and mounted in position is capable of being readily and quickly removed when desired without interfering with any of the other parts.

It is apparent that any portion of the die constructed as above described can be removed at will without affecting in any way the remainder thereof. While the die as shown and described is one of a female character, it is evident that it may be as readily employed in connection with a die of the male character.

I claim:

1. An elongated scroll-edged shearing die, comprising oppositely-disposed, spaced apart, relatively thick backing portions of relatively soft metal, a plurality of thin, short, scroll-edged die portions of relatively hard metal, means for removably connecting said die portions to opposed faces of the backing portions, whereby there are produced companion elongated, thin, sectional, scrolledged dies oppositely disposed and spaced apart from one another, a strip adjacent each end of the backing portions, each of said strips being connected to each of the backing portions and extending across from the bottom face of one backing portion to the bottom face of the other backing portion, and an end die member removably secured to each of said strips and positioned in the space between the opposed scrolledgcs dies, substantially as described.

2. An elongated scroll-edged shearing die, comprising oppositely-disposed, spacedapart, relatively thick backing portions of relatively soft metal, a plurality of thin, short, scroll-edged die portions of relatively hard metal, means for removably connecting said die portions to opposed faces of the backing portions, whereby there are produced companion elongated, thin, sectional, scroll-edged dies oppositely disposed and spaced apart from one another, a strip adjacent each end of the backing portions, each of said strips being connected to each of the backing portions and extending across from the bottom face of one backing portion to the bottom face of the other backing portion, a cross die removably secured to each of said strips and positioned in the space between the opposed scroll-edged dies, a side edge trimming die, one of said backing por tions being configured at one end to receive said trimming die, and removable means for securing said trimming die in place, substantially as described.

CHAS. D. MoDONALD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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