US2424539A - Spring paper punch - Google Patents

Description

July "29, 1947. J,A, BISHO 2,424,539

SPRING PAPER PUNCH Filed Dec. 15, 1945 IN VEN TOR.

QM (2&5

MM,W#\+ Wand iatenteci July 2 9,

SPRING PAPER PUNCH John A. Bishop, Woodside, N.

Johnson Research Corporation,

of New York Y., assignor to a corporation Application December 13, 1945, Serial No. 634,727

9 Claims.

The present invention relates to an improvement in punches, more particularly of the portable hand-operated type.

An object of the invention has been to provide an effective punch which can conveniently be carried around in a pocket or handbag. In known devices of this class where a stripper member is employed, the parts are so arranged that, unless the user exercises care, the paper or other sheet to be punched comes between the male die and the stripper instead of between the female die and the stripper. A further object has been to provide a punch wherein the stripper is so positioned in relation to the dies that the sheet to be punched will always come between the female die and the stripper; and simple means are provided to define the position of the strip edge in relation to the dies so that thehole may be accurately punched at a predetermined distance from said edge, Without however being limited to that distance.

A further object of the invention has been to provide a punch wherein the die carrying parts and the stripper can be made in one piece from light weight sheet material without sacrificing durability or effective operation.

Other objects and beneficial results in operation of my invention will appear from the following description of a preferred embodiment thereof and the drawings appended hereto and in which- Figure 1 is a top plan View;

Figure 2, a bottom plan view;

Figure 3, a central longitudinal section, showing the parts in normal inoperative position;

Figure 4, a side elevation showing the parts in the position reached at the end of a punching operation; and

Figure 5, a transverse section on of Figure 4.

As seen more clearly inFigures 3 and l, the illustrated, embodiment of my invention comprises a single piece of suitable material, as a' short metal strip for example, one end of which is bent back over the base portion I, to form, in effect, a spring-hinged or biased arm or stripper 2. The opposite end is also bent back over base portion I and in part overlapping a portion of stripper 2 to form, in effect, a second spring-hinged or biased, arm or female die carrier 3.

The base portion I provides a support for a male die 4, which, in the illustrated device, is conveniently formed from the material of the base. Longitudinally extending portions of base I are deformed to provide the stiffening ribs 5.

the line 5-5 tion or boss Base I is also provided with a circular hole 6 having a deformed stiffening edge 1.

The strip-per 2 is provided with a hole 8 normally opposite and spaced from male die 4 and with a transversely extending end flange which operates as a guide 9 arranged to engage a portion of the edge of a paper sheet II or the like, to be punched, Figure 3, and thus determine the position of the punched hole in relation to said edge.

The female die carrier 3 is provided at a portion near its outer end. with a circular opening I I presenting a die or cutting edge in position to cooperate with the male die 4 through stripper hole 8, when the carrier is pressed toward the base I by the thumb or a finger of the user. The hole or opening II is surrounded by a deforma- I2 which extends above the outer or upper normal surface of the carrier 3 and below the under, normal surface of said carrier. Thus, said opening II, is so positioned that, in use, the operators thumb or finger is not likely to be injured by the male die 4 as it moves through said opening II. Said female die carrier 3 is also provided with deformations which present stiff ening ribs I3 along its lateral edges.

The ends of the deformations or ribs 5 and I3 are so arranged in relation to the bends or hinge portions formed by stripper 2 and carrier 3 with base I, that the bending or hinge action is restricted substantially to the material forming said bends. The stiffening ribs 5 and I3 also tend to prevent or minimizelateral or twisting movement of said stripper 2 and said carrier 3 in relation to base I, thereby insuring proper operation of the punch dies and prolonging their usefulness.

Where the stripper 2 is arranged and equipped, as shown, it operates not only as an edge guide and to strip the punched sheet out of engagement with the male die after punching; but also provides an effective stop to limit the extent of movement of the female die 8 toward base I and hence the extent to which male die 4 projects through opening I I in making a punched hole, as shown in Figures 4 and 5, for example.

To further insure durability of the dies and their effective punching operation, the radius of the bends I4 and the proportions and arrangement of the parts are advantageously such that when the female die carrier 3 is pressed down in punching, the cutting edge of the female die will lie substantially in the plane of the cutting edge of the male die, as they pass in punching, so that there will be no binding or scraping of the parts as the female die operatively engages the male die.

As shown in Figure 1, a hole [5 is formed in the carrier arm 3 opposite hole 6 in base I and is provided with an edge reinforcing deformation l6. Said holes 6 and I5 provide openings to receive key rings, or the like, or means by which the punch may be hung up, as on a hook.

I claim:

1. A punch comprising a male die support, a female die support and a stripper spring-hinged, respectively, at opposite ends of said male die support, said stripper having guide means extending therefrom at its free end in a direction to be engaged by a sheet of paper or other article to be punched when moved into operative position in relation to said male and female die supports.

2. A punch comprising a male die support, a female die support and a stripper, said support and said stripper being pring-hinged, respectively, at opposite ends of said male die support, and said stripper having means at its free end positioned between said male and female die supports and adapted to limit the extent of movement of one of said supports toward the other.

3. A punch comprising a male die support, a female die support and a stripper spring-hinged, respectively, at opposite ends of said male die support, said supports each having longitudinally extending deformations providing reinforcing ribs arranged and adapted to restrict bending of said supports substantially to the spring hinge end portions thereof. a

4. A punch comprising a strip having end portions bent inwardly toward each other, one portion providing a stripper and the other forming a female die support having a free end portion arranged to overlap and be separated from a free end portion of the stripper, a female die on said female die support and at one side of said stripper, and a male die arranged opposite thereto and at the other side of said stripper, said female die support being biased to normally hold said female die away from said male die and said stripper being biased to normally hold a portion of said stripper in position between said male die and said female die and free of the same.

5. A punch comprising a strip of relatively narrow resilient sheet material having a body portion and end portions bent inwardly toward and overlapping and separated from each other, one end portion providing a, stripper having a free end and the other end portion forming a female die support, a female die on said female die support and a male die arranged opposite thereto on said body portion, said stripper having guide means at its free end arranged and adapted to engage edge portions of a sheet or the like when in position between said dies for punching and thereby to determine the position of the punched hole in relation to said edge.

6. A punch comprising a strip of resilient sheet material having end portions bent inwardly toward each other, one end portion providing a female die support and the other end portion forming a stripper, a female die on said female die support, a male die arranged opposite thereto, and said stripper being interposed between said dies and having a portion projecting in a direction to form a stop adapted to limit the extent of relative movement between said dies in punching.

7. A punch comprising a strip of resilient sheet metal having end portions bent inwardly toward each other and overlying a mid-portion of said strip, one of said end portions providing a stripper, a female die on the other of said end portions and a male die on said mid-portion opposite said female die, said other end portion and said midportion being deformed longitudinally to form edge reinforcing ribs, and said other end portion and said stripper being biased to normally hold their free ends away from said mid-portion.

8. A punch comprising a resilient strip having an end portion bent inwardly toward and overlying a mid-portion and biased to normally hold the free end of said end portion away from said mid-portion, a male die on said mid-portion, said end portion having a deformation extending in one direction toward said male die, a hole through said deformation providing a cutting edge for a female die opposite said male die, said deformation also extending in the opposite direction to form an annular boss surrounding said female die.

9. A punch comprising a strip of resilient metal including a body portion having a die between its ends a die support integral with said body portion and extending from one end thereof in acute angular relation thereto, with a free end overlying and spaced from said die, a die carried by said free end of said die support, a stripper integral with said body portion and extending in acute angular relation thereto from the end of the body portion opposite to that from which said die support extends, and having a free apertured end disposed between, and normally free of, said dies and in substantial alignment therewith and constructed and arranged to lift the punched article from one of said dies simultaneously with the retraction of the other of said dies.

JOHN A. BISHOP.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country Date Great Britain Jan. 14, 1901 Number Number

Images