US1887731A - Stapling machine - Google Patents

Description

Nov. 15, 1932. L, OBS-[FELD ET AL 1,887,731

STAPLING MACHINE Filed Dec. e, 1929 3 sheets-sheet 1 Lum Nov. l5, 1932. L." oBsTFELD ETAL STAPLING MACHINE Filed Dec. e. 1929 s sheets-smeet 2 Aun ATTORNEY Patented Nw. 1s, 1932 'UNITED STATESv PATENT. oFFlcE 'LOU OBSTFELD, 0F BROOKLYN, AND-WILLIAM DRYPOLCHER, OF VALLEY STREAM, NEW

YORK, ASSIGNORS, BY MESNE ASSIGNMENTS, TO SAID LOU OBSTFELD AND I. OBSTFELD, F NEW YORK, N. Y.

STAPLING MACHINE Application led December 6, 1929. Serial No. 412,251.

This invention relates 'to improvements in stapling machines ofthe type embodying a hand operated hammer for driving wire stales or fasteners, which are automatically fed from a magazine one at a time into the path of the hammer.

The invention has for its object to provide a stapling machine of this character which is designed to meet the most rigid economical manufacturing conditions without de'tracting from its efliciency or appearance.

A further object of our invention is to providea stapling machine having the magazine designed to be 'loaded at the front end which is closed by a spring gate or door degate, from its partially open position, and swing it to full open position.

Another object of the invention is `to pro-x vide a locking spring releasably carried in the hammer guide to limit the upward movement of the hammer.

A still further object of our invention is to provide a staple slide having a latch to engage a portion of the magazine case to hold the slide against the full tension of its spring while the magazine is being reloaded.

And a still further object of our invention -is to provide a. staple 'retractor and means for assembling the latter in the front end of the magazine case after the ent-ire machine has otherwise been completely assembled.

lVe accomplish these objectsv by means of the arrangement and combination of parts hereinafter described in the specification, set forth in the claims, and illustratively exemplified in the accompanying drawings, in which Figure 1 is a substantially longitudinal sectional view of my improved stapling machine showing the hammer and magazine case in normal raised position; Figure 2 is a front elevational view of thel plunger housing; Figure 3 is a top plan view of the rear j portion of the magazine showing the staple slide and latch; Figure 4 is va substantially transverse2 sectional view of the magazine taken on line 4 4 of Figure 1; Figure 5 is a substantially longitudinal sectional view of the staple retractor and outer end of the magazine case showing the manner in which the retractor is assembled; Figure 6 is a substantially longitudinal sectional'view of the magazine taken on line 6-6 of Figure 1;

Figure 7 is a longitudinal sectional view of'V the lower end of the plunger housing, hammer and clincher device showing the plunger in its depressed position; F igure8 is a transverse sectional view of the clincher devicetaken on line 8 8' of Figure 1; F igure9 is a transverse sectional view taken on line 8-8 of Figure 7 Figure 10 is a bottom plan view of the knob; and Figure 1l is a substantially cross sectional view of the knob taken on lines 11 .11 of Figure 10; Figure 12 is a top plan view of the plunger housing; Figure 13.

is a front elevational view of the plunger housing and'gate.; Figure 14 is a front elevational view of the plunger and blade; and Figure 15 is a transverse sectional view of the same takenon line\15-15 of Figure 14.

Referring to the drawings, our improved stapling machine comprises an elongated base plate 10 having a pair of spaced upright ears 11 bent from the'mid portion of the base adjacent the reark end thereof. v

Adjacent the front end of the plate 10 the material is struck'up to form a cylindrical clincher housing case 12 in which the clincher mechanism hereinafter described is encased as illustrated in Figures l, 7, 8 and 9. I

Pivotally mounted between the upright ears 11 on a transverse pin 13 is a magazine case 14, which comprises a length of channel bar having its sides bent inwardly and parallel to the bottom with the intervening space to accommodate a staple slide 15. The extreme rearward end of the case 14 is bent downwardly to form a stop lip 16 and adjacent the latter in the bottom wall is a slot 17 projecting transversely thereof, to accommodate one end of aV lat spring 18,

turns upright to form a stop or seat 19 for one end of the staple spring 20, and which in a forwardly direction beyond the slot 17 projects outside and against the bottom of thecase 14 to a oint short of the .pin 13, where it bends ownwardly under'tension to engage in a slot inthe under side of the pin and bear at its forward end upon the surface of the base plate 10. The spring 18 rearwardly of the in 13 tends to exert a downward pull on t e rear of the magazine case 14 and as a. consequence yieldably su ports its forward end atan elevation substantially above that of the base plate.

Permanently mounted within the magazine case 14 is a core 21 of substantially the same shape las the latter except that its dimensions are somewhat smaller, so that when the bottom walls of the case 14 and core 21 are welded together in superimposed position', as illustrated in Fi ures 1 and 4, there will be a space provide along the toptand sides to accommodate the staple slide 15 and staples A. The staple spring 20 is a spiral member with flat sides to fit-inside' the walls of the core 21 and at its forward end abuts a downwardly turned projection 22 of Aa staple latch 23 .which is carried by the slide 15 and held in sliding contact there` with by an end groove formedby a turned over portion 24 ofthe slide, the latch itself being trned back on itself in the groove and provided with a cutv outside portion to form a tooth 25. The turned end of the latch terminates in an upturned fin er piece 26. The projection 22 of the`latc 23 enters the interior of the core-21 throu h an opening 27 which has its forward wal disosed at an angle to -form a ta red o ening. This opening 27 allows t e latc to be swung in the direction of its tooth to engage a notch 28% cut in the edge of the top wall of the ma azine case 14. To remove the tension o` the spring 20 on the staples A the slide 15 is drawn as far back as possible or until the latch 23 swings into a position to engage the tooth 25 in the 5 jecting rearwardly beyond the side walls and downwardly to embrace the sides of the magazinecasing 14, as illustratively exemplified in Figures 1 and^2. The lower end 'of the rear wall of the housing 30 is bent inwardly to form a seat 32, the center of the latter being struck up to provide a boss 33 for the purpose of centering the lower end of a lcoiled spring 34. TheA housing is welded to the magazine case 14 at several points of contact so that the two parts after assmbly become virtually a single integral uni The housing 30 is guideway for a plunger 35 which is a length of square or rectan ular tubing slidably mounted longitudinal y in housing 30, and which is provided at its upper end .with a knob 36, the latter being a stamping having a dome-shaped top and a square or rectangular socket 37 depending therefrom by means of two straps 38, as shown in Figures 10 and 11. The plunger 35 1s yieldably supported in its uppermost pos1t1on by the upper end of the coiled spring 34 whic seats against the inner surface of the knob 36. The plunger 35 is removably mounted in the housing 30 and limited in its movements therein by a'plunger stop spring 39, which has one end turned under to form a hook 40, while the portion adjacent the opposite 'end is offset to form a stop 41 and curved tip 42. The hook 40 engages the lower portion of the back wall of the plunger housing 30 by being inserted under a strap 43 formed by a punched out section of the housing. The stop portionv41 of the spring 39 is yieldably held in position in a slot 44 in the rear wall of the housing and projects therethrough to enter an elongated slot 45 in the adjacent wall of the plunger 35, as shown in Figure 1. It will beclear that longitudinal movement of the plunger 35 is limited to the length of its slot 45 where the ends of the latter abut the opposite sides of the stop 41 ofthe spring 39. Removal of the plunger 35 from the housing 30 is facilitated by merely raising the stop portion 41 outwardly from the slot 45 whchpfrees the (plunger and allows it to be drawn upwar ly out of the housing.

Referring now .particularly to Figure 14, it will be seen that the front wall of the plunger 35 is provided with two spaced circular shaped osses 46, which are stamped outwardly from the lower half of the plunger wall. These oiisets 46 are adapted to project into similarly shaped openings 47 punched out of a plate 48 forming the steel blade or die which after being formed and shaped is hardened and properly tempered. The openings 47 are provided in the upper half of the blade 48 so that when placed on the ofsets 46 the lower end portion of the blade projects downwardly below the plunger 35 and on a plane just forward of the front wall of the plunger. The lower end of the blade is cut away slightly to points just short of the sides to form a pair of iingers 49 curved on their inside walls. The purpose of the fingers 49 is to embrace the opposite ends of the staple A durin the driving operation of the plunger, as il ustratively exemplified in Figures 8 and 9. The lower portion of the blade below the lowermost opening 47 is sli htly thinner than its upperpart so that t ereis a space between its wall or seat 82, and that the latter is disposed in fixedposition overthe free end of the magazine case 14.v

As previously stated, the magazine is loaded at its forward end andthe staples A are disposed along the passage between the walls of the magazine case 14 and core 21 frointhe' pusher 22 to the outer end. l*To facilitate loading the magazine a gate`50 is mounted at one side of the 'housingiSO as illustrated in" Figures 1, 7 and 13, on a-pin hinge 51 which is supported invupright position between one of two pair of'ears 52 welded iny position on the' housing, the other fpairof'ears being mounted on the opposite side `of the housingv 30 and providedrwith a latch pin 53.

The magazine gate or door`50 iscut from -1 a single piece of springsteel having a flat front portion cut awayat yits lower section to provide an opening 54. The front portion is turned rearwardly'at right angles to overlie the sides of the plunger housing 30, see Figure 6, and from the'mid portion of each end a narrow tab projects, one tab being turned on itself to form an eye 56 turning on the hinge pin 51, while theother tab is bent outwardly and rearwardlyT at one inclination, then in a semi-circle 'towards the eye 56to form the latch 57 and finally in a reverse 'curve to provide a finger tip 58. In

the closed position, illustrated in Figure 6.`

the latch' 57 is shown engaging the latch pin 53 to hold the magazine-door 50. The door 50, if accidentally released by bringing the latch 5T overthe latch pin 53, will have the ventire force of the spring 34 behind 'the staples A tending to drive it tov fullopen position with a result of possible injury being vinflicted upon the operator from the projected staples A. llVe have overcome the possibility of such a mishap by means of a coiled spring 59, whichl 'at its ends is coiled about the'hinge'pin and bears against the side wall of thehousing 30 in back of the ears and which at its mid portion is disposed about the ears andvspans the-space between the latter, the mid portion being under tension and held against the forward side offthe ears and in the path of the hingedside ofthe door 50 when the latter swings to open position. It is the purpose of the spring 59 to overcome the inertia of the spring 34 to force the door to its full open position so as to allow the staples to'escape. Therefore, the ii-r'st step in swinging the door to open position is'to vrelease its latch 57 and then' after being swung to a partially open position and against the mid portion of the spring `59, it is necessary to force the door against the spring 59which will yield and allow the full end of the magazinefto be ex osed for 'refilling purposes. It is Aassumed t at an operator, having accidentally released the door 50 before making the staple latch 23 fast tothe magazine case 14, and experiencing the shock of having'the door 50 suddenly yfly to partially open position as the latter engages the spring 59, will be reminded to draw the staple latch 23 back towards the rear of the magazine 14V and engage the tooth 25 in the notch`28 to hold the staple spring' 20^`retraeted, before forcing the door to' its full open position.

In order that the staples Amay be properly delivered one at a tiinefto a position directly inthe path of thedescending blade 48, Jwe

mount a staple retractor inthe end of the corey 21', asv illustratively exemplied in `Figures 1, 5', 6 and 7 'The' staple retractorcom. 'prises a pedestal 60 having anangular wall (i1-forming the rearand bottom and upright side walls 62 which are curved 'at their-free ends `fromthe top of the angular wall to the end of the bottom portion thereof.v Two lugs 63 are punched out of the bottoni portion of the pedestal 60 to forni at their lower 'sides straight surfaces adapted torest upon Ithe lower or closedsurface of the core 21 'which isl turned up at its 4,end -to provide a lip 64 to receive the end of the bottoni portion of the pedestal while the rear ends of the flugs 63 rest against lugs 65`stiuckvup fronithe bottom wall ofthe core 21'. The manner in which the pedestal 60 is placed in the core is illustrated clearly in Figure 5. The sides 62 carry a pin 66 therebetween upon which the ear portions 67v of a tongue 68 arev pivyof metal which swings upwardly against the open top` portion of the core 21 and which projects' outwardly through thepath of 'the blade 48- and is normally heldin engagement with the top side of the opening 50,' asl illus-` trated in Figure 1. v The tongue' 68v is yield? ably supported in this position by Acoiled spring 69 which coils about the pin 66and engages at its opposite end respectively against the tongue 68 andbottoin wall of the pedestal 60@ lt will be seen,'ac'cordi'ng to Figure 7 that as the blade 48 is driven downwardly,"the stapler-i in itspath isprojected between the gate and the endof the core. 21 and against the tongue 68 which yields'` tothe pressure and swings about the pin 66 until the *crossl or closed end of the staple is far enoughV on its way to pass the. end ofthe tongue, as illustrated in Figure 7. The succeeding staple still in the ways is prevented from further movement bythe upper portion of the blade, but as the latter lifts andfreturns to its initial positio'nthe tongue 68 follows the end of the bladeinits upwardcmovement, which finally reaches an elevation -above "thatof the staples, whereupon the s feature ofthis arrangement is the ease with which the parts may be removed and inserted again in the event of repairs being necessary.

The clincher mechanism is mounted in the ures 1,7, 8 and 9, and comprises a two piece cap shaped case which 1s mounted inthe housing 12 and provided with a lug 71 projecting from its side wall into a oove 72 in the adjacent wall of the housmg. The case 70'is a stamped member and about midway of its height a flange 73 is arranged against which a heavy coiled sprin 74 seats.l

at one end while the other end of t e spring bears against a disc 75 fitting tightly in the base plate 10 at its under side to close the opening formed by the metal upturned to form the housing 12. The top wall of the v clincher case 70 is rovided with a diametrically disposed slot7 neath the blade 50 whenthe latter is depressed with the hinged casing 14. The slot 76 is formed by turning the metal downwardly on opposite sides of a slit cut in the cover. Pivotally mounted on pins 77 mounted in the side walls of the slot 76, adjacent opposite ends thereof, are clincher jaws 78, each thereof being a flat piece of material with an inwardly curved upper side 79 which ends in an upturned tip and straight end side 80. The ends 80 are arranged in very close proximity to each other when the staple A is being clinched, as illustrated in Figure 9. The under sides of the jaws 78 are rounded outwardly to form cam surfaces 81. Each jaw 78 has a rojection 82 on its side to limit theirpupwar movement about the pins 77` the projections 82 engaging the lower end o one of the side walls of the slot 76. Reciprocally mounted in the clincher casing 70 is a jaw supporting member 83 upon -the upper surface of which the cam surfaces 81 rest.

The skirt portion of the member 83 is slidably fitted against the cylindrical interior of the case 70. A coiled spring 84 yieldably supports the member 83 in which it is housed, the spring 84 being in contact with the disc 75 dat one end and the member 83 at the-other en The operation of the device is as follows: Assuming that the magazine ischarged with staples 'A and it is desired to fasten a package of papers together," the latter is placed over the clincher case 70 andthe' blade 50 driven downwardly by depressing the lmob at the upper end of the plunge 35,' from the position ofV Figure 1 to that of Figure 7. Continued movement of the blade 50 causes the ends of the staple A to pierce the package and strike the inwardly curved upper housing 12, as illustrated particularly in Fig-l 6 directly in line and be-A sides of the jaws, which while they spre under the pressure of the blade, the resistance offered by the spring supported member 83 is sufiicient to turn the staple ends inwardly to the position shown in Figure 8. The final movement of the blade brings the staple to the position shown in Figure 9'where it is com leteliy clinched and the support 83 resting irectdy on the disc 75. When the plunger is release it springs upwardly and allows the clincher case 70 to ride up under tension of the s ring 74 until the flange 73 is stopped by the ange 85 at the upper end of the housing 12.

Having now described our invention and the manner in which the same operates, what we claim and desire to secure by Letters Pat- 1. In a stapling machine the combination of a staple-carrylng arm for receiving and discharging the staples from the same end,

a sta le driver reciprocable on the arm, means for eeding'the staples along the arm and into the path yof the driver, and means disposed over the loading and delivery end of the arm to hold the staples in the driving position when closed and capableof only partial unresisted movement to open position when released.

2. In a stapling machine, the combination of a sta le-carrying arm for receiving and dischargm the staples from the same end, a staple river reciprocable on the arm, means for feeding the staples along the arm and into the path of the driver, hinged means disposed over the receiving and discharging end of the arm, and resilient means engaged by the hinged means upon reaching partial open position'for resisting movement of the hinged means to full open position.

3. In a stapling machine, the combination of a staple-carrying arm pivotally mounted and yieldably supported adjacent one end, a staple driver reciprocable on the free end of the arm,^means for feeding the staples .door in its partially open position.

4. In a stapling machine,l the combination "of a staple carrying 4arm pivotally mounted and yieldably supported adjacent one end, a staple driver reciprocable on the free end of the arm, means for feeding the staples along 'the arm` and into the path of the driver, a

door hinged at one side of the free end of the arm and in closed position forming one wall of the path of the staples under the driver, and resllient means to arrest movement of the door to open position beyond a point directly ig the path of the staples being projected a ong the arm.

' 5. In a stapling machine the combination of a staple carrying arm pivotally mounted=` loaxis of the door, opposite ends of the spring being Xed and the mid portion forming a stirrup supported underl tension of the coils in the path taken by the door swinging to open position, engagement of the door with the spring taking place when a portion of the free'end' of the door is still in the path of any staples being projected by the feed from the open end of the arm.

2 6. In a stapling machine, the combination of a staple carrying 'arm pivotally mounted and yieldably supported adjacent one end and adapted to be loaded' and discharged from the free end, a staple driver reciprocable on the free end-of the arm, means for feeding'the staples along the arm under pressure and into the path of the driver, a door hinged at one side of the driver andv comprising a U-shaped member, the cross portion of which closes over the open end of the arm to form the outside wall of the path taken by the staple under the driver, the free end of the door having a portion to yieldably hold the door in closed position and a projection beyond' said portion to remain in the path of the staples when pro-v jected beyond the path ofthe driver, and a spring stop for the hinged end of the door to yieldably resist the door in its movement to open position beyond a point where said pro- 40 jection would be in the path of the staples being projected from the open end of the arm. 7. A stapling machine, as claimed Vin claim 5, in which the cross piece of said door is fut away at its under side to form a slot, and a staple retractor mounted in the free end of the arm and having a yieldable arm projecting across the path of the driver and suppoited against a wall of said slot to support a staple in the path of the driver. l

8.In a stapling machine, the combination of a staple carrying arm comprising an louter and aninner casing spaced apart on top and at their sides to form a passage for the staples, the upper wall of both ca-sings having longitudinal openings, a'staple driver reciprocab'le on the end of the arm, means for feeding the staples along the arm and into the path ofthe driver, a hinged door for the driver end of the arm having an opening,fthe upper wall of which is below the space between the two upper walls of the casings, and a retractor for the staples comprising a pedestal detachably mounted in the arm back of the said door, a tongue pivotally mounted in the pedl estal and having the tip, and movable through portion disposed co-axially of the swingingk -driver end of the arm,

the pathl ofthe driver and opening in said door, and aspring yieldablysupporting the tongue against the upper end `of said opening in the door to support a staple in the path of the driveiysaid tongue when depressed being inside the path of the staple and driver.

9. A stapling machine, as claimed in claim 8, in which the inner casing at its endV adjacent the door is cut away and turned upitol form a lip against which one end of tlie pedestal is engaged, said inner casing being further provided' with lugs to receive the other end of the pedestal.

10. In a stapling machine, the combination of a staple carrying arm comprising anlouter casing and an inner core spaced from each other on the top and two sides to form a magazine passage for the staples, said casing and Y core having longitudinal vopenings along their top walls, astaple driver reciprocable v on one end of the arm, a hinged door for the and means for feedinothe staples along the magazine passage and into the path of the driver, comprising a spring arranged in said core, a staple slide in said passage between the loose end of the spring and the staples, a pivotal support yadjacent the spring end of the arm, and a spring for resiliently supporting the arm in raised position and projecting into the core to form a seat for the xed end of the spring for projecting the slide, and means carried by the i slide and adjustable to one side for latching the slide to the casing to hold the said spring under tension. j

11. In a stapling machine, the combination of a staple carrying arm, a plunger housing on one end of the arm, aplunger reciprocable in said housing, comprising a tubular mem-v ber rectangular in transverse section, a blade mounted on one end of the plunger, and a one piece knob for the other end comprising a dome shaped portion provided with radial T-shaped projections, the stems of which are bent under the dome portion and the cross pieces are bent to abut each other at their ends to form a rectangular shank dis osed axially of the dome and adapted to em race the end of the plunger opposite the blade. I

12. In a stapling machine, a standard having a base with upturned ears at one end and a raised circular portion at the other, a staple carrying arm pivotally mounted at one end between said ears, a staple driver reciprocable on the other end of the arm, and means forV sitely disposed jaws pivotally mounted in the case and having their' free ends projecting 125 towards each other, the upper` walls Iof the jaws being inwardly curved and terminating in a raised tip, and a second casing spring supported within the first casing and supporting the jaws from underneath, whereby a staple being driven by downward movementof the driver will engage the curved walls of the jaws and turn the jaws downward which rst turn the staple ends towards each other and then under pressure theouter casing recedes and lowers the pivotal ends of the jaws causing the free ends to rise to turn the staple ends upwardly.

13. A stapling machine, as claimed in claim 12, in which the circular portion of the base is provided with a. shoulder at its lower open end, and a disc driven into the base against the shoulder to form a seat for the said casings in depressed position.

14. A stapling machine, as claimed in claim 12, in which the upper end of the circular portion is inwardly flanged and provided with a longitudinal guideway on its side, the outer -casing being provided with a. flange midway of its height anda lug projecting radially of the side wall to move in said guideway.

In testimony whereof they have aixed their signatures.

25 LOU OBSTFELD.

' WILLIAM DRYPOLCHER.

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