US2604623A - Pocket stapling machine - Google Patents

Description

July 29, 1952 H, RUsKlN 2,604,623

POCKET STAPLING MACHINE Filed Dec. 30, 1948 3 Sheets-Sheet 2 INVENTOR ATTORNEY H. RUSKIN POCKET STAPLING MACHINE Jglyzs, 1952 3 Sheets-Sheet 3 Filed Dec.

R N R mm E w n l A 5.

.MY .KONE

Patented July 29, 14952 `Hen-ry Rskin, Bayside, N. Y., assignor to Speed Products Co., Inc., New York, N. vY., ai corpora-i' l `tin of New York` Appiieefmn'peeemer so, 1948, serial' Nc. 'e'gisi 'The' subjectmatteroitlii-s inventi'cnis a simpli-A ned and improved staplin-g machine adapted te be utilized as a tacker and 'one-Objectis to employ a -swiveled and slidabl-y guided one piece staple driver spring adapted to straddle the'v rear end-of the staple magazine to prevent Withdrawal ofthe rstaple `i'ollow'er therefrom and having means for slidably and removably' interlocking with the magazine to precludebo'dily linear accidentald'is'placement thereof relative to themagazine. Another vimportant object isi r'e'alized in utilizing a one p'ie'c'estaple dri-ving' spring to' slid-- ably interlock' with and be guided by a front 'sheath embodying' spaced sides clos'elystraddled bytrans'versely spaced 'cheeks of 9, staple contain ing vmagazine characterizing spaced pockets ft'o receiveand position thespaee'd sides'of 'thesh'e'ath in longitudinal alinement` vWitlispaced -sides of the magazine. Another object' residesz in the previsionof `spaced bridge means in 'the 'magazine for interlocking with notched sides of the sheath whereby coopera-tive but spaced parts of itl-ie sheath and magazine effectively consti--` tute a staple receiving raceway. Anotherobe j'ect is' 'to `l'a'rcufide inwardly turned anges at the front part'- of the" magazine vadapted to vbe received 4byalined slots of the spaced sides of the' sl'i'eatlr to retain and anchor the latterin a predetermined Yinterloclue'd lrelation with the magazine. A iur'tlie'r o'bec't is to provide a `stop inwardly overhanging the sheath for linearly guiding a dependingl staple driving blade of the' one ip'ieee .spring driver having' 4an oiset upper reach and-'a lower reachintegrally merged with arrarcuate'portion or-elbow. Anotherobject is' directed to Acoeperative means onthelower reach' o 'the spring dri-ver for interlocking `With'd'epending means from the magazine to prevent'l ac clderitali "bodily rrrearw'arddisplacement Vet" the driver when vslidabl'y guided by the inwardly overhanging means ofthe sheath. Other imv portantobje'cts deal with: the provision of downwardly land outwardly projecting spring fingers depending' lfrom th'e' lower reach `for sustaining the .magazine in predetermined spaced relationvvitl'iv the hasevof tile'stapling xnac'liine";v the' provision of a loosely mounted bushing carried by the bottom wall of the magazine for rotatably andlinearly guiding the' lower reach of the one` piece stapleV driver .spring Ahaving at its front endf'thedepending blade' adapted to be projected downwardly through 'the raeeway i'or' ejecting 'the foremost staple of a staple strip fromthef magazine; the provision' of means coi1`. stitu-t'inga novel 'relief connection permitting the 15 Claims. (Cl. 1-3) magazine to 1Lbe tilted .relative te the. Base and characterizing means to precliideaceidental none zontal rotation of the base'relativetaime'raadde--v zine; andthe provision ci a yloesec'zonneci'iicn formed bythelower'reach 'f the Ione' piece driver" spring and thel loosely m'imted -lian's'liirig carried by the :magazinejwhereby .the driver spring xz'xay be bodily linearly shifted in a vdireieiien away from tire raeeway te'be unlocked frenr'tnersheatn whereby tire-upper reach of the one piece'- 4driver spring isauteniatically elevated to' permit swivel-i ing of the driverspring te vcrear-anzi begfreeef the rear end `of 'tirez ,Stacie -roilcwer red. einer important cbjeet is concerned Vwrm the provisin of naredineans on the's'pacecisidesef' the sheath to facilitate insertion f the staple driving b1a'd`e .mtu the: ,latter for interieekingwitn the inwardly verhanging' meansjen'tne y'iront wall of 'tiie sheath preparatory to locking :the driver spring against Jaccidental.'rie'arward and linear displacement .relative to tli firiagtiiine. other important objects. and' iiictieiiai Aand strueturaiffeatures of .tneinvention wilt appear' with. the accompanying vdi"si.-w`ir'i`gs'ivlie'ifeiiii v n 1 is aside elevational view of .t1e-'staliiig machine according to my invention.

Fig. 2:is a front-view ofjfig. K u Fig. 3risla plan view lci" Fig... l but on a smaller scale.

Fig. 4 `is :a vperspective view of tha-ene piece driver spring howeverYwi-tlifthe ,covert thereefremoved'.l v

Fig. 5- is a fragmentary perspective view of themagazine. showing ther sheath` disassociated. from the body'of `the magazine. Y

Fig. 6 isv a view sim-ihn torlig.A 1,. however.. 'ex-- hibiting the resilient staplegdriver' or Aone piece spring unlocked' from.zthe sheathv` oilthemaga.- zine and with the upper reach. of thev driverk anto-y m-atically elevated.l y. A

Fig.- 7 isa'view 4similar view toI .Gf-although partly broken away to'=-show Athe* linteriorV con-1'y structionaand.illustrating the-swiveledvnor pivoted staple driver swungfto one side .io'f Jtlie iinazgiazinel and. base'.

Fig.. a man enlargeeiiransverse :seenenei on the v line o`f Fig; L .r

Fig. 9 is a section-a1.fview'orifltheline'iSJ-#Swot Fig". 1.

rig. 1o is-a irensverseseetienai vierl @eine Fig. 12 is a fragmentary bottom plan view of the magazine. Fig. 13 is a View taken on the line I3-I3 ,o

YFig. 6.

of Fig. 4, and

Fig. 18 is a sectional View on the une Ia--lsl of Fig. 1. y

The stapling machine according to the invention is generally designated SM and is characterized by the base B, the -staple containing magazine M and the swiveled and reciprccable Yone piece resilient staple driver D. Y

The base B is preferably of an appropriate one piece sheetgmetal stamping having at its forward endastruck out anvilAprovided with spaced clinohing indentationsl.

Struck out ofthe base visthetapered boss or keeper IIY having therectangular slot I2 for reception of loop ISdepending from'andstruck out of the bottom wall I4 of the magazine M.

To permitlmagazine M to swivel .relative to base, wall I4 thereof is provided withdownwardly tapered opening I5 or bearingmeans (Fig. 9) for rotatably receivingthe tapered head I6 of the internally threaded' bushing or guide means I'I having reduced portion I8 rotatably retained in opening or bearing I9 at the rear end of base B by'the set screw 2U`threadably connected to the internally threaded bushing I'I. By this arrangement, base B may be swung to the rear of the' magazine whereby. 'the latter may be also used as Va tacker (Fig. 14) after whichif desired the base may be quickly' restoredv into an interlocked relation 'with' loop I3.

` Magazine M (Figi 5)"is U-shapedemboclying spaced sides 2| provided with 'inwardly over` hanging flanges 22 which.y preclude spillage` of the 'staple strip S through the top of the magaz ine having" the elongated staple guide channel C"constituted Vby the upstanding sidewalls 2| and the intervening bottom wall I4. Y

ASpaced cheeks-23 although integral with side walls 2l ofthe magazine areV laterally offset therefrom and closely straddle the upstanding andspaced side walls 24 of the U-shaped sheath 25 having alined Vand rectangular openings 26 forl receiving the inwardly turned anchoring flanges or l'ugs 2Ifor holding the walls of the alined notchesf28 at the vbottom parts of sides 24'of the sheath 25 interlocked' with the neck or bridge portions 29 constituting spaced parts of the bottom wall of the magazine. j

" -The uppery portions' UP of the sides 24 of sheath-25 are reduced as shown and extend ape.

preciably above the anchoring viiangesor lugs 21y which are: inhorizontal alinement Awith the f As previously stated cheeks 23`are offset-la erally relative `to the sides 2 I of the magazine and constitute therewithpockets'or recesses for re-V ception A of sides 24 Voff the Asheath'whereby the inner surfacethereof can be automatically arranged in alinement with the vertical inner faces of the sides of the magazine after the sheath is interlocked and anchored against the positioning spaced bridge or neck portions 29.

Removably mounted and slidably guided within channel C is the stapleY pusher P slidably carried on rod 35 and urged always towards the enlarged Ahead' of rod 35 by'spring 31 abutting loop shaped manipulator 38 at the rear end of rod 35 and the rear transversely disposed lug 39 which with front lug 4B is slidably guided on rod 35. Lugs 39 and 4i) extend upwardly from the bottom wall 4I of the pusher P comprising spaced elongated sides 42 extending upwardly from the bottom-wall 4I.l More specifically the forward ends 43 of sides 42A of the pusher yieldingly abut the last staple of the staple strip S whereby the forward staple is arranged within raceway R and under depending blade 45 of the one piece staple driver spring D which embodies the arm or upper reach generally indicated 46 having the lower .end inclined component V4'I integrally merged with the forwardly and upwardly vslop-y ing component 48 from which blade 45 integrallyA depends.

Driver D is further ,characterized by therhorizontal portion or lower reach 49 integrally merg.

7), thereby rendering loop 38l accessible for unlocking from the magazine. A

The lower reach or .saddle 49 has its forward 'y end bent downwardly to form the spring nger 52 while rear end thereof is characterized by the downwardly depending spring nger 53vand both of these fingers are adapted to resiliently bear against rear part of the base B. 1

Tongue or terminal ,54 ofy the lower reach 49 is inclined or biased upwardly but slightly and is adapted to be removably shifted into the depending claw or hook 55 struck out of the bottom wall of the magazineand to receive the impact by the magazine during the downward driving stroke of the spring driverD, thereby resisting appreciable deection of spring fingers 52 and 53 on downward pivotal displacement of the magazine rendered possible due to the loose Yconnection definedby the bottom wall of the magazine about the bushing or guide means I1.

In the interlocked relation of terminalv 54 with claw or hook 55 (Fig. l) detent 56 struck from the bottom wall of the magazine is within opening 57 at which time theinwardly overhanging guideV lip orstop 58 of sheath 5 5 is projected within the rectangular Yguide opening 59 in the lblade 45 of the driver D, thus locking ythe latter against rota-` tion in respect to the'magazine. f f

The saddle or reach- 45 togetherr with itsfingers 52 and53 also Vserves as ymeans to maintain a predetermined spaced relation Aof the magazine and base. ,Y

1f 'the driver blade 45 teffu'n'y interiocked with guid'enpv 5a dug. 1') ,Tit is in nnewith the raceway. Rand just slightly above theforemost'staple of the staple strip. f Now by applying a downwardly directed thrust on driver4 D near-blade 45, Athe latter drives the foremost staple through the racewayand onto the anvil A to be clinchedlby meetsy the anvill A or Amore specifically the mat'eri'al (not shownl to be fastened: and' placed on thev anvil,- and because of the loose association of bushing I1 'and bottom wall of the magazine the latter drops `downwardly (Fig. 7') away fro-1n head'II' of the bushing when the driver' is first bodily shifted rearwardly,y namely', to an unlocked relation (Fig. 6) andfthere'after swung laterally relative to the magazine or base. In such relation loop 38 no longer is vstraddlied by spring driver D and now can be lifted from notches 60 and unlocked or unthreaded from lugs 6I at' the rear end of the magazine. It follows that the staplefollower rod 35 and consequently follower or pusher P can be bodily withdrawn from channel C, thereby providing full access to the latter for cleaning or for loading or insertion of a staple strip through the rear open end of the magazine after which the staple follower and' the rodV are against restored in channel'Cto urge the foremost staple of' the staple strip into the raceway R.

Subsequently the driver D is swung or pivoted about the. bushing |"I loosely fitted to the magazine for alining tongue or lip 54 for reception by and interlocking with hook or stop 55` when the driver is bodily thrust forwardly. However prior to this action the upper reach 46 is flexed downwardly first to permit the lower end of blade`4`5 to be projected between the outwardly bent lips 55which denne aforwardly converging or tapered throat for guiding the staple driving bladey 45 .towards the'inwardly overhanging stop 58 to be received by opening 59' upon' forward bodily displacement of the driver whichis held ina normally elevated' position against' stop 53 due to the recoil' ofthe elbow E;

llilith the' driver D` interlocked with stop 58; theflatter also servesxto guide and limit the downward" stroke of "blade 4:5"which takes place when the upper wall of" opening 58' strikes stop 5'8 at which time the foremost staple has just been clinchedv Vby the anvil.

On shifting driver Du from' theV unlocked position shown in Fig.' 6 to its locked position with thehook 55`V ofthe magazine (Fig. 1'), detent 55 frictionally bears down on reach 49 until tongue 54 is fully interlocked with hook 5,5; thereby facilitating travel of tongue 54 over hook 55 and' upwardly extending boss 'I2 embodying the ofi--`v setl but lowermarginal nan-ges 13". Flanges "II" and '13 suitably retain a plastic casing PC in place and this casing enhances the appearance of the stapling machine. The base B may also be conveniently covered yby the plastic casing PB for a similar purpose.

Where the stapling machine be desired for tacking purposes, the base can be quickly unlocked from loop or hasp I3. This is accomplished by raising the front end of driver D when interloeked with stop 58, thereby lifting loop I3 out of the relief opening I2 in boss or keeper Il after which base B can be rotated to be arranged totherear of themagazine (Fig. 14)

After use as a tacker, the base may be restored to be f-ullyf under the magazine by rotating the latter to allow cam or boss II to ride against loop I3 until the latter snaps into interlocking relationship with the relief opening I2, thus again locking the magazine and base at which time thel raceway R is in alinement with the clinching indentations- III of the anvil A.

Of importance is the fact that when blade 45 is sli'dably interlocked with stop 58 (Figs. 1 and 14) elbow E closely straddles the magazine and prevents Withdrawal of the follower and its rod which can only take place when the driver is first bodily, rearwardly but rectilinearly shifted to an unlocking position and thereafter by rotating driver D bodily to overhang the magazine, access is then had to loop 318 to detach the latter from the magazine.

Although stud I 'I is vertically slidable in bearing or openingr I5, it also guides linear displacement of the driver D on shifting the latter longitudinally of the magazine. The upper biased or sloping reach of the driver is spaced from the magazine and extendssubstantially over the entire length thereof. Thedriver is preferably of relatively thin vsheet metal and reinforced for purposes of rigidity and strength as hitherto pointed out while the bridge or elbow E is outwardly convex and inwardly concaved and due to rinherent resiliency always urges the upper reach upwardly, therebyV automatically raising the latter above the sheath when` the driver isY unlocked from the abutment or stop lug 58. As shown the staples are supported on the bottom wal-l I4 of the magazine and are closely but slidably conlnedV in channel C. Since guide or stud I1 is loosely' associated with bearing I5 ofthe magazine, the latter tilts downwardly relative to the base B on the downward stroke of the blade 45 where utilized in cooperation with the anvil A. The driver D' of course may be considered 'as a loop having its upper and lower reaches straddling the rear part ofV the 'magazine and claw or hook 55 isa keeper for the biasedor inclined tongue 54.

Various changes may be made in ydetails of` `construction and arrangement of parts without departing from they spirit of the invention or Vsacrificing, any of the advantages thereof in- .reach,. and arcuate bridge means integrally merged with the rear ends of said reaches and normally holding said upper reachl elevated; a`

staple magazine straddled by said reaches and having, means for removably and Yslidably guiding,

,. saidbladasaid magazine. and blade having complementary interlocking means to limit upwardV displacement of said blade, and said magazine and Ylowerreach having meansr constituting a slidableV connection to provide for linear displacement of said'resilient driver longitudinally of said magazine for disabling saidinterlocking means.

2. In a stapling machine, a one piece resilient driver comprising; an upper reach, astaple driving blade depending on the front part of said reach, a lower reach spaced from said upper reach, -and arcuate bridge means integrally merged` with the rear-ends of said reaches and normally holding said upper reach elevated; a staple magazine straddled by said reaches and having dmeans for removably and slidably guiding said blade, said magazine and blade having complementary and separable interlocking means to limit upward displacement of said blade, and

said magazine and lower reach having means constituting a slidable and rotatable connection to provide for linear displacement of said resilient driver longitudinallyof said magazine for disabling said interlocking means and to provide for rotational displacement of said driver relative to said magazine pursuant to disabling of said interlocking means.

3. In a stapling machine, a staple magazine having a raceway, a one piece resilient driver comprising; an upper reach above said magazine and embodying a depending staple driving blade slidably and removably guided in said raceway and provided with an opening, a lower reach,

and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; inwardly overhanging means projecting from said magazine Vand cooperating with the walls of said openingy for slidably guiding said blade in to and out of said raceway, and said magazine and lower reach having cooperative means characterizing a connection to provide for bodily and linear displacement of said driver towards and away from said overhanging means.

4. In a stapling machine, a staple kmagazine having a raceway at the front end thereof and guide means at the rear thereof, aV onepiece resilient driver comprising; anvupper reach above said magazine and embodying a depending staple driving blade slidably and removably guided in said raceway and provided with an opening, a lower reach having an elongated slot surrounding said guide means to provide bodily linear and rotational displacement of said driver, and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; and inwardly overhanging means projecting from said magazine and cooperating with the walls of said opening to `limit vertical displacement of said blade and to preclude rotational displacement of said driver relative to said magazine.

5. In a stapling machine, a staple magazine having a raceway at the front end thereof and guide means at the rear thereof, a one piece resilient driver bodily shiftable in a 4direction towards or away from said raceway and comprising; an upper reach above said magazine and embodying a depending staple drivingr blade slidably and removably guided in said raceway and provided with an opening, a lower reach having an elongated slot surrounding said guide means to provide for bodily linear and rotational displacement of said driver, and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; and inwardly overhanging means projecting from said magazine and adapted to be received in said opening to limit displacement of said blade relative to said raceway and to preclude rotationalv displacement of said driver relative to v'said magazine. i

6. In a stapling'machine, a staple magazine having a raceway at the front end thereof and guide meansV at the rear thereof, a one piece resilient driver bodily shiftable in a directionY means to provide for bodily linear and rotational.

displacement of said driver, and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; means projecting from said magazine and adapted to be removably received in said opening to limit displacement of said blade relative to said raceway and to preclude rotational displacement of said driver relative to said magazine, a base below said magazine and including at its frontpart a staple clinching anvil, and means securing said base to said guide means. i

7. In a stapling machine, a staple magazine having a raceway at the front end thereof and guide means at the. rear thereof, a one piece resilient driver bodily shiftable in a direction towards or away from'said raceway and comprising; an upper reach above said magazine and embodying a depending staple driving blade slidably and removably guided in said raceway and provided with an opening, a lower reach having an elongated slot surrounding said guide means to provide for bodily linear and rotational displacement of said driver, and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; a lug inwardly overhanging said magazine and adapted to be removably received in said opening to limit displacement of said blade relative to said raceway and to preclude rotational displacement of said driver relative to said magazine; a base below said magazine and including an anvil, and means rotatably sustaining said base relative to said magazine. n

YIi. In a stapling machine, a stapleV magazine having a raceway at the front end thereof and including bearing means, guide Ameans loosely guarded on said bearing means, a one piece resilient driver bodily shiftable in a direction towards or away from said raceway and comprising; an upper reach above and spaced from said magazine and embodying a depending staple driving blade slidably and removably guided in said raceway and provided with an opening, a lower reach having an elongated slot surrounding said guide means to provide for bodily linear and rotational displacement of said driver, and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; and inwardly overhanging means projecting from said magazine and adapted to be removably received in said opening to limit displacement of said blade relative to said raceway and to preclude rotational displacement of said driver relative to said magazine, a base including an anvil, mens securing said base to said guide'means, and spring means extending from said lower reach and abutting said base to hold said magazine normally in a predetermined distance away from said base.

9. In a stapling machine, a staple magazine having a raceway at the front end thereof and 'b9 including bearingv means ,guide means movably disposed in said bearing means, a-v one piece resilient driver bodily shiftable in 4a direction towards or away-from said raceway and comprising; an upper reach above said magazine and l embodying a depending staple driving blade slidably and removably guided in said raceway and provided with an opening, alowei reach having an elongated slot surrounding said guide 'means to provide for bodily linear and rotational displacement of said driver, and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; vinwardly overhanging means projecting from said magazine .and adapted to be removably received in said opening to limit displacement of said blade relative to said raceway and to preclude rotational displacement of said driver relative to said magazine, a base including an anvil, means rotatably sustaining said base on said guide means, and detachable locking means to prevent rotation of said base relative to said magazine,

- metal y resilient channeled Ikdriverhaving ,offset magazines-spring; fingersdependine from Said bysaidkeeper.

' f 12g-,In a stap1ng-mac1iiea stapler/magazine -havinga raceway ,at the frontend thereof and includingbearingmeansj guide', means movably disposed vin said bearingmeans, 4acne 'piece shet marginalflange's and bodilyv shiftable in a direc- 'tion` towards or, away fromA said raceWayE-a .d comprising; an upper reachaboyefsaid magazine .and embodying a. dependngnstaple drivingfblade slidably and removably guided in said raceway and provided with an opening, a lower reach 10. In a stapling machine, a staple magazine having a raceway at the front end thereof and including bearing means, guide means loosely disposed in said bearing means to permit tilting of said magazine relative to said guide means, a one piece resilient driver bodily shiftable in a direction towards or away from said raceway and comprising; an upper reach above said magazine and embodying a depending staple driving blade slidably and removably guided in said raceway and provided with an opening, a lower reach having an elongated slot surrounding said guide means to provide for bodily linear and rotational displacement of said driver, and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; inwardly overhanging means projecting from said magazine and adapted to be removably received in said opening to limit displacement of said blade relative to said raceway and to preclude rotational displacement of said driver relative to said magazine, a base including an anvil, means rotatably sustaining said base on said guide means,

complementary detachable locking means to prevent rotation of said base relative to said magazine, and said magazine and lower reach having cooperative detent and detent receiving means for detachably locking said driver against rearward linear displacement relative to said magazine.

11. In a stapling machine, a staple magazine having a raceway at the front end thereof and including |bearing means, guide means slidably disposed in said bearing means, a one piece resilient driver bodily shiftable in a direction towards or away from said raceway and comprising; an upper reach above said magazine and embodying a depending staple driving blade slidably and removably guided in said raceway and provided with an opening, a lower reach having an elongated slot surrounding said guide means to provide for bodily linear and rotational displacement of said driver, and a curved portion integral with said reaches and arranged near the rear end of said magazine; inwardly overhanging means projecting from said magazine and adapted to be removably received in said opening to limit displacement of said blade relative to said raceway and to preclude rotational displacement of said driver relative to said magazine, a base including an anvil, means rotatably sustaining said base on said guide means, detachable locking means to prevent rotation of said base relative to said magazine, a keeper depending from said having an elongated slot surrounding said guide means to provide for bodily linear and rotational displacement of said driver, and a curved bridge portion integral with said reaches and arranged near the rear end of said magazine; inwardly overhanging means projecting from said magazine and adapted to be removably received in said opening to limit displacement of said blade relative to said raceway and to preclude rotational displacement of said driver relative to said magazine, a base including an anvil, means rotatably sustaining said base on said guide means, detachable locking means to prevent rotation of said base relative to said magazine, and a cover for said reaches and bridge portion and retained by said flanges.

13. In a stapling machine, a magazine, a resilient driver having a loop portion defining upper and lower reaches straddling said magazine and having a depending blade at the forward part thereof including an opening, a lug carried by said magazine and adapted to be received by said opening to limit upward displacement of said upper reach, means movably sustaining said lower reach adjacent said magazine, said driver adapted to be shifted linearly rearwardly to free said blade from said lug for automatically elevating said upper reach above said lug, said upper reach adapted on manual pressure thereon to be tilted downwardly prior to linearly shifting of said driver toward said lug for the reception of the latter by said opening, and detachable locking means to preclude accidental rearward linear displacement of said driver relative to said magazine.

14. In a stapling machine,` a magazine, a one piece resilient sheet metal driver having a loop portion `defining upper and lower reaches straddling the rear end of said magazine and having a depending blade at the forward part thereof including an opening, a lug carried by and inwardly overhanging said magazine and adapted to be received by said opening to limit upward displacement of said upper reach, means slidably sustaining said lower reach adjacent said magazine, said driver adapted to be shifted linearly rearwardly to free said blade from said lug for automatically elevating said upper reach above said lug, said upper reach adapted on manual pressure thereon to be tilted downwardly prior to linearly shifting of said driver toward said lug for the reception of the latter by said opening, and complementary detachable locking means to preclude accidental rearward linear displacement of said driver relative to said magazine.

15. In a stapling machine, a magazine, a resilient driver having a loop portion defining upper and lower reaches straddling the rear end of said magazine and having a dependingblade at the forwardv part thereof including an opening,v a lug carried 'by said magazinerand adapted to berreceived byV said opening to limit upward displacement of saidupper reach, means rotatably and slidably sustaining said lower reach adjacent said Amagazine, said driver adapted to be shifted linearly rearwardly to free said blade from 'said 'lug `for automatically elevating said upper reach above said lug, said upper reach adapted on manual pressure thereon to be tilted downwardlyl prior toline'arly sluiting of said driver toward said 1ug-for the reception ofV the latter by said opening,- detachable locking means to preclude accidental'rearward linear displacement of said'15 2,445,180

REFERENCES CITED The following references are of record inthe le of this patent;

UNITED STATES PATENTS Number Name A Date 2,343,932 Ruskin i Mar. 14, 1944 r2,399,761 Ruskin M ay 7, 1946 2,420,830 Maynard '11 May 20,V 1947 Maynard Y, f--- July 13, A1948

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