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Publication numberUS2131473 A
Publication typeGrant
Publication dateSep 27, 1938
Filing dateSep 19, 1934
Priority dateSep 19, 1934
Publication numberUS 2131473 A, US 2131473A, US-A-2131473, US2131473 A, US2131473A
InventorsWilliam Drypolcher
Original AssigneeAbe Obstfeld, Lou Obstfeld
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Stapling machine
US 2131473 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Sept. 27, 1938.- w. DRYPOLCHER] 2,131,473..

,STAPLING MACHINE I Filed Sept. 19, 1934 2 s eds-Sha gy C WENT 'R P 1938- I r WJDRYPOLCHER- 4 STAPLING'MAGHINE Filed Sept. 19, 1934 yz srieegsshet' Patented Sept. 27, 1938 H 1 UNITED signer to'Lou Obs'tfeld, Brooklyn, N.= Y.,"and;Abe Obstfelcl, New York, N. Y. I Application September 19.1934;-sen 1*1-;.744;e54 I 7 18 Claims. (c i-3) 1 This invention is concerned with a stapling 12A is samejas Figure l2 eircept machine and has for its object the improvement I thatthe mechanism shows the plunger and. driifin stapling machines, particularly in connection ing blade a t'the botton of its stroke and also 'dis with the trend toward incorporating -many difcloses the actionof the retraction? i 5 f erent types of staple clinching arrangements in Figure 13 is a section or. the stapler on'a' hoi'ione machine. I I zontal lineabov the magazine." Figure lgis a Stress has alsobeen placed upon aconstrucvertical section through a' modified construction I tlon which tends to eliminate clogging of the of the ,clinching-dieandit'smounting. Figure'lfif, staples.

. is a perspective "view' ofthe plunger and -'some A further feature of the invention is embodied adjacent parts with staplef'and'sheetsin place. in the simplicity of design allowing foreconomishow'n'in'Figur'e 1;:the devicejconsists of a cal construction and continual trouble-free func- I staple carrying arm 24 pivoted tofaguide" plate tioning of the machine. I I 'or base l3, the base being 1 of 1' rectangular. cone One embodiment of my invention is illustrated struction with do nwardly;.bnt{fi nges 'I9'run-' by way of example in the accompanying drawning along'both sides; s to fafi ordf greater ings in which: i f d tyff' i Figure 1 of the drawings shows a side view of 'At the forward part 'of' the ase; fisfstamped one assembly ofthe device as used for stapling. slotZfl (see Fig. '3)'which 'co-actswith the"clinch-- Figure 2 is a cross section taken on line 2 -2 ing plate shown in Figure as willbe described of Figure 1. later. Just forward of slot 20,jthere is stamped Figure 3 shows the perspective view of the base and the top of the device, with some of the parts removed,,using the assembly as of Figure 1. ure 4 is a cross section through the plunger knob.

gure 5 is a perspective view'o'f one type of a clinching die 38; whlchis shaped Isl) as to bring I the legs of the driven staple together in. a clinch. "At therear' of 'saidfbase there is, j turned upward from the material composing the base, a pair of brackets with"piv o t;holes l8. "Inbetwe'en'these upturned bracketsfis riveted removable clinching plate distorted and partially p ead open and roughly indicating that more than'one clinching die may be shifted to align under the stroke of the driving blade, and also shows two of the more frequently used die shapes for clinching'the staple. The normal shape of the plate assembled on the machineis shown in I Figures 1 and 9. I

Figure 6 i a perspective view of a channel the plunger at the top position of its stroke,

7 I in position springfl l, the function of which will bo'explainedlat'er. The staple carrying arm consists of magazine Zfljwhich is composed of two similarly shaped pressed metalside pieces. These areiijiveted to .a core 22 (Fig.1), said',cOre hOIding'fthelside Pieces rigidly in position side pieces, how'- ever, Test against spacing plates 23 ,j which serve to keep the'core substantially separated from saidsh'aft having an extension which projects I the side plates, sop-as to allowthe passage' 'of spacer, used to maintain a definite space'through pl s IWhiCh d on the r 9d cgdwb w which the driving blade and staple moves. the core and the side plates. i

Figure 7* is a perspective view of a formof The core is pivot d to rb e driving blade used- T I The side plates 24 of themagazi'ne are flanged 40 Figure 8 is a perspective view of a plunger inw ly so as to house he outside and the Stop shaft. I I of the staple clip. The flanges then tur "up:

Figure 8A shows a modifiedplun h nk ward 'as' web members new efifect structural Figure 9 shows the stapler with its base swung ti Q 1 1 I Q back fouse the deviceto drive staples without At theforward partfcffthe housing, theside I clinchingthem. H I plates and webs are bent outwardat substantially, I15

- Figure'lO is a front view on line |u |o of Figright an i sas shown A and Bra'ctingas ure 1 showing a modified form of themachine a bac i the'p un er un t- II I assembled with a staple retracto'r member. I The spacer plate 49' shown inFigure is as Figure 11 is a perspective view of a retractor sembled'to the front 'bent POI iOIlSffOf' the sides I attached to a driving blade showing'the method p a s and a co e at 25 i it qgt evn 50 of assembly. I I I I holding the entire assembly in -positi0n. I 'I'he v Figure 12 is a partial section on line l2-l2of plunger unit consistsofaidrivng' blade assho'wn Figure 10 but with the near side of the casing in Figure'l, riveted by'means of rivet 2] to the removed to expose the interior mechanism with plunger'shaft as shownjfin Figured, thetopfof the machine.

hole 30 in thecore.

through the plunger knob, as shown in Figure 4. the extension then being riveted'over.

Figures 1 and 2 show the assembled plunger knob 4 held in position by the riveted portion 35.

of the plunger shaft 8. Spring I is mounted on the plunger shaft land serves to return the plunger knob to its uppermost limit, after said knob has been pressed downward as in operating In Figure 1 the staple-feedingarrangementis shown as consisting of an inverted U-shaped pusher 3| with bent up ears 52 having openings which carry the guide rod 3!.

The front end of the pusher rod 3! is headed or riveted as at I! forming a stop which limits the travel of the pusher along the drive rodi As a result the pusher is not pushed off the end i1 moved to insert a fresh supply of staples;

To arrest the pusher ll while still clear ofthe path of the driving blade I, the top of the pusher Si is provided with a front bent up ear 32 which strikes the back of the driving blade I as the pusher ll thrusts the last staple under the driving blade I, and thus arrests thepusher before it gets under the driving blade "I.

Monnt'ed on said rod is spring i6 which serves to forcethe staple pusher forward, thereby feedingstaples 33 toward the staple driving position. The staple pusher rod-may beheld fixed, in position by several methods, two of which arejshown in the accompanying drawings.

, In Figure istaple' pusherrod is shown with bend I which engages against inwardlyturned flaps 21, thereby holding rod in position. Another method is shown in Figure 9, in which flaps 2,1 are eliminated and t ple p s er rod Provided with abent end i5 is inserted downwardly in The spacer plate as shown in Figure .6 has severalfunctions, one of these is to provide sufficient space between the coverplate 26 and the outwardly bent shoulders of '24 to allow passage of the driving blade andstaple. '1

Another function of the spacer plate-is for the side edges 29, to act as guiding edges so that the staple during the operation of driving,.will'be firmly supported on the sides. Still another function iscarried out byjthe crosspiece 28 which extends directly in the path of the upward stroke of the driver. The top edge of the driver (see'Figure impingesagainst edge 28 and is, thereby. prevented from further vertical upward movement. In other words, 2; acts as a stop.

. One form of clinching plate is shown in Figure 5', the upper surface ofv this plate has embossed in it the die slots into which the-Staple legs descend and are thereby clinched in various. fashions. i

2| '(see Figs. 5 and 14) represents an indent formed by the metal being punched downwardly, so asto protrude and engage in slot 20. The side edges of the clinching plate contact against the edges formed by the downwardly bent flanges l9 and are guided thereby. The protruding metal from engages in theslot 20, said slot acting as a stop to limit the motion of .the clinching plate in either direction so, as to properly align either type of clinching die slot directlyunder the staple driving channel."

several different types of --clinching simply by aligning the desired die slot under the staple driving blade.

A third form of clinching plate is shown in Figure 14 bent at 5b to embrace opposite sides of the base It and indented both on top and below at Ila. to engagethe slot 20.

' The open end of the clinching plate is snapped over the front of the machine and pushed backwardiy until indent 2| drops into slot 20. It may be forced in either direction so as to align different types of clinching slots on its surface.

The alternate type shown in Figure 9 has clinching slots embossed on top and bottom surfaces; therefore, it may be removed and reversed so as Y to bring uppermost whatever clinching slots have been stamped on the reverse surface of the clinching plate; then pushed back into operable position on'theba se of the machine.

This feature is of considerable importance as it makes available a wide variety of different types of clinching slots on a single machine. It

shouldbe noted, also that theclinching plate is removable and should, the'user desire only the standard time of (clinching die, this isavailable in the clinching die embossed directly in the base.

The staple core 22 is provided with step 50. It will be seen that the base may be swung backward through an angle of approximately 180 degrees. When in this position, the base is held snugly by means to be described, and the rear edge of that portion of the base which acts as brackets comes to a stop against the step in the core. When the base is inithis position, the machine may beused as a tacking machine.

It will be noted that the upper rear corners of the pivoting brackets of the baseare bent inwardly toward each other. Ordinarily these corners are not in contact with the core. However.

when the base is -swung around, as shown in Figure 9, the corners tend to press against the core and hold it by friction so that the baseremains firmly in position and may be used as an'auxiliary handlepermitting the use of the device as a tacker.

Refer to Figures 10 andll. One modification of the machineis shown in, which the frontplate 26 has at its lower cutout portion two projecting wings 4|. Slidabl'y attached by means of a rivet 43v to the driver] is' a strip 42 substantially rectangular in shape with an elongated slot 44 provided near one end and at theopposite end being provided'with'ears and bent tongue 45. This attachment works in conjunction with the staple driving mechanism to retract a staple which has not been completely expelled from the staple driving channel. It is calleda staple retractor. In the present invention, this retractor, being slidably mounted on the'blad'e, has its tongue 45 protruding under the cross-bar of the staple so as to support said staple during the stroke of the blade. Its position at rest is clearly indicated in Figure 12 which shows the relative positions of the driving blade, the staple and the retractor tongue. At the bottom of the stroke of the blade, the ears 40 engage ,andri'de over the wings 4| thereby bending the retractor in such fashion so as to disengage the tongue. 45 from underneath the staple crown permitting said staple to be driven flush into the material. As continued pressure is applied on the plunger duringthe downward stroke, the retractor tongue 45, even though bent outwardly by wings 4|, strikes against the material being stapled and as further continued pressure on the plunger forces from under the cross-bar of the. staple.

it downwardly, the :retractor l2. remains fixed against the material and the changing relative position of the two parts is compensated for .by

the motion of pin sliding in slot 44.; 'Asthe blade starts its upward motion, the retractor is carried along. with it until the upper edge or the ears 40 engage against the under. edge of-- the plunger housing 26 and retain the retractor against further upwardmotion while the relative position betweenthe bladeand retractor is again compensated for by the motion of he pin 43 through slot ll.

In operation, the machine is loaded by disengaging the feed rod l6..frnm the latching means and extracting the rod thereby removing the staple pusher at the sametime, .Staplesare then inserted on the core and slid as far toward the front as possible. The pusher3l is againplaced on the core and pressure exerted on the rod [6 toward the direction of the front of the machine.

The action forces the pusher forward, thereby feeding th'e staples so that the foremost staple on the clip is directly under the driving blade. Further forward pressure of rod It results in compression of the feed spring, thereby storing up enough pressure to feed'the staple .clip forward as the foremost staples are used up. The rod is now latched in position in accordance with one of the methods shown, and the device is' ready to beused. a Pressure on plunger knob .4 results. in the entire magazinepivoting at point l8 and revolvin against pressure of spring. i [until the bottom of the magazine rests onthe material .to be stapled.

Further continued pressure on'the plunger knob drives the staple downward through the material and into whatever type of clinching slot is aligned under the blade, thereby clinchingthe legs ofthe staple. r H

The retractor is so arranged that in its normal position as shown in, Figure 12 the tongue remains underneath the cross-barof the staple. 'As the plunger .is depressed, the tongue continues in its position underneath the cross-bar of thestaple and should the stroke be uncompleted and the plunger returned to its topposition, the tongue follows along under thecross-bar of the staple,

thereby bringing it backwith the blade. As the stroke is carried further downward toward completion, the bent out ears on the side opposite the tongue engage in wings on the face plate of the machine with the result that the entire re tractor is lifted outward, disengaging the tongue The staple, having now been released, is ready. for the final clinching motion of the plunger.. During this final clinching motion, however, the retractor is pressing againstthematerialto bestapled and if some method were not provided for release of thefurther pressure, there would be a tendency tobend the retractorout of position. To avoid this, a slot has been incorporated in the retractor and so' arranged that the retractor can slide backward by means of the co-action between stroke.

" use ss-acre. thebaseislisimplyiswun a I back, through anangle of approximately 180 degreeswhereit'is held frictionallyandcan now be 1 J us ed as'.a; h'and1e while the remainder-:01? the 2 machine-is used asatacker. 1 ..-"Although the drawings show-my I severalof its diverse forms'. it is'tmbeunderstood l that :there is no, intention gtorli mt this invention totheseforms, as there may be. many-modifications, made withoutldepartlnggfrom theprinclples a .nd;,the scopeof'myinventionpa What-Iclaim.isas follows: H 1.--;A- staplingmachine comprisinga .baseya .magazine over-the basega core, located in spaced relationship to the. side .and top. surface oi: the rnagazine and pivoted to the-base, means forfeed! ing staples alongthe core-toward the frontof the machine todrive the foremost staple, and ..'a

clinching die in the base'adapted to clinch over invention 5 the legs R of the staple,.-saidcorev having. a step at the rear end .to act as a stop. for: the ,pivotingmo- .tion of. the; base when base is-.-swung back approximately 180 degrees :2, .A..;st apling machine comprisinggaz base," a magazine over the ,basegacorelocated in'- spaced 1' relationship to the side, and :top surfaceeof .ythe. magazine and; pivoted .to the *..base;- means..-;;-for' feeding staples .alongathe core towardathevfront of the-machine, a stapledriverat the frontend of the, machine to drivethe foremost :staple, and aclinching die .in the base-adapted tolclinch over the legs of. the. staple,.saidcor ehavinga step cut I out above thepivoting point, and said base' being adapted tojbe swung backward through.anI-'arc;to

allow the 1 rear end of the .base to stop against the cutout portion of the-core.-

- 3. In a staplin g'machine the cornbination of 'a staple carrying: arm containing .a-core to support the staples, means to feed the staplesiforward on the core, anda stapledrivingrmeansat theforward end of the arm with a clinchingbasepiix- 'oted to the core at the oppositecnd said base having. downwardly bentside-flanges, and. an :aux-

wardly bent side flanges-of thebase. a 4. .In a stapling. machinefa basehaving down wardly ,bent longitudinal flanges, amagazinei-a- I driving-blade, =a clincher-plate having .-an-. .upper face with diverse clinching diesto=variously clinch t: staples driven by the b1ade,saidplate having. an"

arm extending.;-beneath the plate 'and between" the flanges, and means onthea-rm bearingqagainst. the bottom. of the base for. holding the plate-.upon

the base holding it in a setpositloni- 5.; In a stapling machine, arelatively longfand 1- narrow base having a slot and downwardlybent flanges atitslong ed s. a-magaaine abovefthe base, aslidably mounted clincher plate withrarms'v and I having an upper face with diverse clinching dies to variously. clinch-staples drlvenbyithe blade,- an arm of-the clincher plate extehdingbeneath; the. base tohold-the plateuponthe base, I

guiding means for the" clincher. plate, "and a deZ-' the-lslot' on j tent on the clincher. plate jentering the-base tolimit its travel.-.

6.- In a stapling machine -the -combination;with" the clincher die, a retractor travelling with the driving blade, a tongue forming part of theretractor 'and adapted to'swing'under the staple driven by thedrivingblade so that'it holds the staple, against th driving blade, ears onthe retractor; and cam surfaces carried by the magazine, said ears sliding thecam surfaces to carry [the tongue clear of thestapleafter it enters the sheet tobe stapled; v 7. In a stapling machine the'combin'ation with I a base anda magazine, of a device for feeding staples-along the magazine'a clincher die in' the base, a driving blade'adapted to drive the staple set under it by the feeding device to-clinch it on the clincher. die, a retractorhavinga tongue normally lying under 'theistaple ready to be driven so thatit travels downward; with the driven staple, an car on the retractor; and cam surfaces on the magazine to carrythetongu'e clear'of the staple as the staple head contacts: with the sheet tobe'stapled. I 8. In a stapling machinea staple"ca'rryi'ng h arm, a core in said arm a base, upstanding cars on the base-having resiliency, a pinforming a pivot for the core carried in the ears so that the 1 coreturns easily on the baseysaid core adapted frlctionally to engage the ears to hold the base .after. the base has been swung as much as a" right n'angle'away from the core. r a

9. "In a stapling machine, a core forming a staple support, sheet metal plates' fixed to the core and spaced from it to accommodate staples sliding on the support, and convergingabove the core to formlshoulders to hold the staples on the support,

said plates havinglaterally extending wings, a

driving blade to cause the staples; to attach papers,- a pusher for the staples including atop memberiabovethe support and" side members between the support and the plates, a 'springdriving the-pusher to feedthe staples to the blade and lyingabovethe support; and between the plates, said wings formin'gback guides'for the driving blade, and a frontsheet metal'gulde fast tothewingsj 10. In astapling a" staple support, sheet metal platesriveted to the support/and spacedfrom 'it to accommodate staples sliding on the support and converging above the member to form shouldersto hold the staples on the'support, said plates havinglaterally extending wings, a driving'b la'de to cause the staples to'attach papers,'a pusher for the staples including a top member above the support and .sidemembers between the support and the plates,

aspring driving the pusher to feed the staples to the blade, and lying above the support, said .wings forming back guides for the driving blade,

a front sheet vmetalguide fast tolthe' wings, a

sheet metal base, having upstanding ears, and a pivot for the supported which it turns between theearsr.

-' 11-: In a stapling'machine, a'base having downwardly bent longitudinal flangea'a'magazine, a (driving blade, a clincher plate havinganjuppi r face with diverse clinching dies to variously clinch staples:driven by-the bladegsaid platehaving a ,bent over bottom arm lying bet'weenthe flanges to be guided by them andunderlying the'bottom of the base to holdstheupper face upon the base.

12. In a stapling device,amagazine',"a plunger means for feeding staples along themagazine ben'eath' the plunger'so theplunger may drive a base.

machine, a solid bar forming staple, a-retractor tongue slldable on theplunger and normallyunderlying the bridge of the staple so as" to hold-a staple to the plunger but adapted -to travel with the plunger, a casing, wings on the casing, ears-on the tongue adapted to. strikethe wings to jswingthe tongue to free it from the" staple as the tonguereaches-the limit of its travel with'the plunger, and a plungerhousing forming part of the casing adapted to be struck bythe ears to arrest it under the cross-bar of the; next staple as the plunger rises abovethe level of that cross bar.

, l3; In a stapling'machine, abaseya magazine, adriving blade, a clincher plate having an upper face" with diverse clinching dies to variously clinch staples drivenby'theblade, said blade having a bent over bottom arm lyingagainst' the bottom of the base tohold-the upper face upon the i4; In a stapling machine, a staple carrying arm, a core in-said arm, a base, upstanding ears on the base having resiliency and pivoted on the core and normally turning easily on the core, said core adapted-to "frictionall'y engage the earsto ;hold the base after the base has been swung" as much asaright angle away from the core.

'15. In a stapling machina'a relatively long and narro'wbaselhaving aslot, a magazine above the and having an upper face with diverse clinching dies to variously clinch staples driven by the blade, an arm of the clincher plate extending beneaththe base to hold the plate upon the base,

guiding means for 'theclincherplateand a detent on'the clincher plate entering the slot to limit its travel.

16; In a stapling machine, a base, a magazine, a driving blade, a clincher'plate having a die; to clinch staples driven by the blade,said plate having al'b'ent overbottom arm, saidarm being pro vided with a clinching die, and lyingagainst the bottom of the base to" hold'the upper face'upon 'the base and reversibleto br'ingin position under the bl'adeits 'die tootherwise clinch staples.

1'7. In a stapling device amagazine, a driving blade slidable across the magazine, a clincher plate having an'upper face with diverse clinching dies to variously clinch staples driven -by the blade, a'guide plate on which the clincher platefis slidable, downwardly bent longitudinal flanges on the guide plate, a pivot connecting theguide plate base, a slidably mounted clincher plate with arms and magazine'to bring theblade and clincher plate into alignment, said clincher plate having, 'abent over bottom arin lying between the flanges to be guided by them and lying against the bottom of the guide plate tohold'the clincher plate u'ponthe guide'plate,

r .18. In a stapling 'devicea magazine, ,a driving blade slidable across the magazine. a clincher plate having an'upper face with diverse clinching 'dies to vairiouslyfclinch staples driven by the blade, 'a'gu ide plateon which the clincher plate is lidable, anjarm of the clincher plate extend-' ing'beneath, the g uide plate to hold'the clincher plate upon the guide plate, a pivot connecting the guide plate and" magazine to bring theblade.

and clincher plateinto alignment, guiding means for the clincher plate, and a detent upon the clincher plate entering a slotinthe guide plate to limit its travel. I

wniia rnayror cnan.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2574988 *Sep 24, 1949Nov 13, 1951Neva Clog Products IncStapling plier
US2643376 *Feb 28, 1950Jun 30, 1953Semler Loren HMagazine and feed means for stapling machines
US2695407 *Nov 17, 1948Nov 30, 1954Goodstein Charles BStapling machine
US4556161 *Feb 16, 1983Dec 3, 1985Daichiku Co., Ltd.Stapler and staples to be mounted
US6299047 *Oct 1, 1999Oct 9, 2001Erwin Mueller Gmbh & CoStapler
US7080768 *Aug 23, 2004Jul 25, 2006Worktools, Inc.Spring energized desktop stapler
US7222768May 1, 2006May 29, 2007Worktools, Inc.Spring energized desktop stapler
US7407072May 31, 2006Aug 5, 2008Worktools, Inc.Contoured base for desktop stapler
U.S. Classification227/134, 227/120
International ClassificationB25C5/06, B25C5/00, B25C5/02, B25C5/10
Cooperative ClassificationB25C5/10, B25C5/06, B25C5/025, B25C5/0207
European ClassificationB25C5/02D, B25C5/10, B25C5/02F3B, B25C5/06