US2587749A - Paper punch - Google Patents

Description

March 4, 1952 w. H. MISSON PAPER PUNCH 2 SI-IEETS--SHEET 1 Filed April 6, 1948 F IIEi I INVENTOR. VW/fiam /7 M550 FIE E March 4, 1952 w. H. MISSON 2,587,749

PAPER PUNCH Filed April 6, 1948 2 SI-IEETSSI-EET 2 a l. V

\y/IIIIIIIIIIIIIIIIIIIIIJYIIIIIIIIIIIIIIIIIIIII j .9 /i r "1 l /6 /7 7? /4 Fl E 4 INVENTOR. M M/Mm #4/(650/7 Patented Mar. 4, 1952 UNITED STATES PATENT OFFICE PAPER PUNCH WilllamH. Misson, Los..Alt'os,.Calif.

Applibation-Aprilfi, 1948', SerialLNo..19,-269

2Claims. 1,

My invention relates to. means. for. cutting. a. plurality of holes in one. or. more. sheets of. paper orthe like and is especially concerned; with. a. manually operated machine convenientfor use in domestic or ofiice surroundings.

It is an object of. my invention in. general to improve paper punches- Another object of my inventionis to provide. a paper punch in which. the work or manual. force necessary to cut a hole in1a. single sheet. or several sheets of paper is minimized.

Another object of the invention is to provide. a paper punch in which centralized holes. can. be punched in sheets of different, widths,

Another object of the invention. isto'provide a paper punch which is easy to. manufacture, to assemble and to disassemble.

Other objects together with the foregoing. are. attained in the embodiment of the invention, described in the following description and illustrated in the accompanying; drawings. in which:

Figure 1 is an isometric view of my paper punch.

Figure 2'is a bottom view of the paper punch, a part of the bottom cover plate being removed to disclose the interior construction.

Figure 3 is a cross section, the planes of which are indicated by the lines 33 of Figure 2.

Figure 4 is a cross section, the planes of which are indicated by the lines. 44 and 5'5 of Figure 3.

In its preferred form, the paper punch of. my invention includes a base of hollow construction having a removable cover. thereon and adapted to receive cutout portions of punched paper and being equipped, with a detent centralized adjustable spacing guide for coordinating a sheet to be punched with a pair of reentrantly cut plungers slidably mounted in the base to descend through a paper-slot. The plungers are propelled simultaneously by a spring returned handle pivotally associated. with the. base. by: yieldable strap supports, and having a stroke. limiting bumper incorporated therein.

While the paper punch of my invention: is susceptible to many difierent uses and. varieslin design somewhat depending uponv itsparticular use and environment in which it: is. to be employed, it has been successfully fabricatedin the form disclosed in the accompanying. draw.- ings. In this embodiment of the deviceetherev is provided a base member 6 whichlfor quantity production purposes is preferably. agnetallic die.-- casting. having. a generally. sloping top. table. 1: merging with a pair of side walls8--and 9 as well aswitha small front wall II and a substantial rear walll2. Between the inclined table 7 and the rear, wall I2 there is a parallel top wall [3 spacedqfrom the bottom of the structure to pro vide an interior compartment 14.,

The bottom of the compartment is normally closed and a, support is provided for the entire structure by a bottom. cover plate L6,. for example stampedgof. sheetmetal and. embossed. to providesurface engaging feetv I] preferably elongated. sov that their shape makes" them suitable to. serve; not only as supporting protuberances but. likewise as reinforcing ribs. The closure plate L6. fitssnugly within a marginal groove l8 cast. into. the body 6 and preferably is externally faced with flock or other suitable soft surface finishso that the punch when positioned on a smooth. surface will not mar it.

In. order that punchings can readily be removed from the compartment. l4 Without the necessity ofdetachingthe plate IG'which isnormally held. in. place by a. plurality of screws l9 engaging bosses 2|. formed integrally with the base 6, 1 provide areadily removable metallic.

plug. 22. This is generally circular in contour and. has a pluralityof springy. fingers 2:3 up.- standingfrom itanddesigned to engagev friction.- ally with the margin of an. aperture 24 piercing the. bottom plate. 16. removed by an operator and can. as easily be forced back into position when the. contents of the compartment M have been removed.

Sinceit isdesired accurately to position a sheet or a. plurality.- ofsheets. of. paper or other mate.- rial. to bepunched. with respect. to the base 6 and especially with respect tothe inclinedtable. 1, I provide a gauge means. This: preferably comprisesastrip 2S of metal or the. like. preferably diecast and of generally rectangular. cross section having an upturnedstop 2! at oneend thereof. The slide 26 passes-through: apertures 28 and 2 9 in the side walls il and 9 respectively.

In passing through the compartment I4 it is guided within a channel 31- formed by diecast portions of" the table 7 depending intothe-compartment M and closed byan overlaid diecast: The housing is preferably formed housing 32". with a plurality of apertures through which project pins 33 that are riveted or staked to form a The plug readily may betervals along the length of the slide 26. The depressions in the slide correspond in position with indi-cia such as numerals 39 cast on the slide to represent width divisions, for example inches of width of a sheet of paper. The indicia are made visible for adjustment of the slide through a window 4| centrally disposed in the inclined table I and provided with an arrow point 42 to indicate the centralization of the numeral.

Since the spacing of the numerals is preferably at half scale, the slide 26 can be moved so that if the width of a sheet of paper is known, its corresponding number when visible through the Window 4| will indicate that the side stop 21 is in a position so that when the edge of the sheet is in contact with it, the sheet is centralized on the table. The provision of the spring thrust ball detent mechanism makes it simple to adjust the slide into designated or desired position yet holds the slide in such position against accidental dislodgement. For shipping purposes, or packing, the slide can readily be withdrawn from the apertures 28 and 29 so that the width of the structure is reduced. To prevent the ball 31 leaving its socket under those circumstances it is slightly staked in place.

In order that a sheet positioned upon the table I and especially upon the parallel surface 13 can be appropriately punched, I provide as a part of the base structure 6 a superstructure 44. For convenience in fabrication this is preferably a separate die casting and includes a rear wall 46, a top wall 41, and a pair of side walls 48 and 49 joined by a front wall conveniently carrying a central index 52 in the nature of a projection in alignment with the projection 42. The superstructure 44 is held in position on the base 6 by a number of die cast projections 53 extending through apertures in the base and riveted or staked in position.

Projecting forwardly from the front wall 5! yet terminating at a distance above the table l3 are bosses 54 and 56 respectively which are substantially identical in construction so that a description of one applies equally to the other. Within the boss 54 is a sleeve 51 having a reduced circular cylindrical lower portion serving as a guide for a plunger 58 and having an enlarged upper portion serving as a housing for a spring 59 which encompasses the plunger and at its lower end rests against an offset in the sleeve. The lower end of the plunger 58 is provided with a re-entrant portion 6| in one view having an inverted V-shape and providing sharp edges of a symmetrical nature. The punch plunger 58 is designed to span the paper receiving aperture 62 between the bosses 54 and 56 and the upper surface l3 and to enter into a hardened ferrule 63 mounted in the base 6. When a piece of paper is disposed within the slot 62 overlying the ferrule 63 and the plunger 58 descends, the sharpened edges of the reentrant portion 6| pierce the paper uniformly from opposite sides so that there is no tendency to displace the paper or to displace the plunger 58. This provides an even cut and since the bottom of the V-shaped portion acts as a shear against the interior of the ferrule 63 a circular disc is severed cleanly from the paper sheet.

In order to operate both of the plungers 58 simultaneously there is provided an operating handle 64. This handle is preferably a die casting of generally rectangular shape and is provided adjacent each of its substantially identical sides with a rib 66. With the outside edge of the hanr of the base 6.

dle, the rib provides material to receive a cross channel 61 inwhich is rotatably disposed a pin 68 piercing the plunger 58. The lips of the material defining the channel are slightly staked to overlie the pin 68 during assembly so that a substantially permanent connection is made. The contour of the material adjacent the side edge and the rib 66 is such as to afford an appropriate seat for the upper end of the coil spring 59, which therefore tends to raise or lift the handle 64 with respect to the base 6.

In order to serve as an appropriate fulcrum or pivot point for the punch yet in order to permit the plungers 58 to be translated without substantial side thrust or lateral force, I provide a yielding mounting. In the handle 64 at opposite sides thereof and spanning the space between the interior rib 66 and the outer wall, are aligned transverse pins H and 12. The pins are identical so that a description of one applies equally to the other. Each pin extends in from the outer surface and is readily removable although it is longitudinally fluted near one end and also is a tight enough frictional fit so that it does not rotate in the handle nor of its own accord become dislodged. The pin passes through an upper loop 13 formed in a metallic strap 14 of doubled material passing through an aperture 16 in the upper surface 47 of the superstructure. At its lower end the strap is extended to underlie the lower end of the ferrule 63 to serve as a deflector for severed paper discs and is bent to underlie the riveted head 11 of a projection passing through aligned apertures in the strap and forming part Since the material or the strap 13 is flexible and since the aperture 16 does not confine the strap, the motion of the handle 64 is primarily a rectilinear motion so far as the cross pins 68 are concerned and is slightly arcuate so far as the cross pins H and 12 are concerned. The result of this is to provide an easy and smooth motion for the handle and for the plungers 58.

To restrain the amount of action produced by the springs 59 and to serve as a stop, the handle 6 64 in its rearward portion is provided with a resilient bumper 18 designed to abut the top surface 41 of the superstructure with a cushioning effect so that the return motion of the punch is quietly arrested.

The structure is readily disassembled by withdrawal of the pins H and I2 from the loops 13 whereupon the plungers 58 and the handle are withdrawn from the superstructure, the springs 59 can be removed from the plunger, and the entire mechanism then inspected and by a reverse process re-assembled into operating condiion.

In use, a sheet of paper is disposed upon the inclined table I with one edge of the sheet abutting the previously properly adjusted slide 26. When the forward edge of the paper has traveled up the incline 1 into the slot 62 and has come into abutment with the rear face of the slot, the operator depresses the handle 64. This simultaneously compresses the springs 59 and drives the plungers 58 downwardly through the paper and into the ferrules 63. The resulting punched out paper discs fall into the interior compartment [4 from which they can be subsequently removed. Upon release of the handle 64 the springs 59 restore it to its inactive position with the bumper 18 in abutment with the surface 31 and with the plungers 58 withdrawn from the slot 62 so that the appropriately perforated paper can be. removed.

I claim:

1. A paper punch comprising a base, a superstructure on said base and therewith providing a paper slot, said superstructure having apertures therein, a pair of plungers, means on said superstructure for guiding said plungers in a straight path to move across said slot, a, lever for actuating said plungers, pins for pivoting said lever on said plungers, transversely spaced fulcrum pins on said lever, and wide metal flexible straus looped over said fulcrum pins passing through said apertures and secured to said base for flexibly fulcruming said lever on said base.

2. A paper punch comprising a base inclusive of an interior compartment and having a. top wall with openings and with plunger ferrules therein; a separate superstructure abutting said base and overlying part of said top wall to provide a paper receiving aperture therebetween, said superstructure having openings in line with said openings in said top wall; plungers reciprocable in said superstrurture for movement into said ferrules; means for interconnecting said superstructure and said base; a lever pivoted on said plungers; transversely spaced fulcrum pins on said lever; wide metal flexible straps looped REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 337,139 Dowell Mar. 2, 1886 1,561,723 Keefover Nov. 17, 1925 1,582,465 Hart Apr. 27, 1926 2,001,161 Snyder May 14, 1935 2,028,848 Roscoe Jan. 28, 1936 2,149,268 Brennan Mar. 7, 1939 2,200,672 Kern May 14, 1940 2,260,223 Harper Oct. 21, 1941 2,327,646 Hutchinson Aug. 24, 1943 FOREIGN PATENTS Number Country Date 15,031 Great Britain Nov. 9, 1905

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