US2915753A - Stapling machine - Google Patents

Description

Dec. 8, 1959 H. RusKlN 2,915,753

` STAPLING MACHINE Filed Nov. 28, 1.955 3 Sheets-Sheet 1 M "llww' 69 56 246, 1| 'III 'l Il l 'H' '63 m/ 69 526 uw x i 6] 5696 l 1'7/ 6P INVENIpR. Y Henry Ruskin ATTORNEY Dg 8, 1959 H. RusKlN STPLING MACHINE l3 Sheets-Sheet 2 Filed Nov. 28, 1955 M m S ATTORNEY Dec. 8, 1959 H. RusKlN 2,915,753

STAPLING MMJHINE- Filed Nov. 28. 1955 3 Sheets-Sheet 3 INVENTOR.

Henry Ruskin dmw ATTORNEY nite tates Patent 2,915,753 Patented Dec. 8, 1959 STPLING MACHDQE.

Henry Ruskin, Bayside, N.Y., assigner to Swingline, Inc.,

Long Island-City, NX., a corporation ot' New York Appiication November 2S, 1955, Serial No. 549,406 8 Claims.. (CL 13).

This invention isa staplingmachine having a swingable staple containing arm hingedly associated with any anvil that is, flexed towards each other relative to the front wall to permit the reception Within the magazine of a staple pusher having means for interlocking with transversely spaced staple guiding rails carried by the sides and interposed therebetween to limit divergence of and to retain the. sides and the rails in substantial parallelism upon removal. of the finger pressure formerly applied 'to the sides preparatory to mounting the magazine on the base. xed stanchion rising upwardly from the rear of the base and adapted to be conveniently assembled therewith and including transverselyV spaced ears having alined openings for supporting ful'crum means swingably carrying both the magazine and the cap. Another object resides in interlocking the rear end of the stanehion with the rear part of'the base and subsequently interlocking the front end of' the anvil carrying. member with the front end of the base and thereafter superimposing the anvil carrying member on a forwardly extending plate. of the stanchion whereby this plate and the-anviiy carrying. member arev thereafter anchored together by rivet means to the base. Another object is to employ theiixed stanchion whereby it can be straddledby transversely spaced corresponding rear ends of the sides of the magazine and thus serve as stabilizing means for the magazine, that^is,. to provide rigidity in precluding squeezing of such sides towards each other. Another object is realized in' empioying a resilient upstandingv and biasedf loop extending up'- wardly and' rearwardly from the rear endl of the. anvil carrying member for normally holding the swingable` arm spaced from the xed anvil carrying member. Another object is to provide spaced wings integral with and rising upwardly from the base for movably guiding the swingable arm during itsA swingable displacement towards or away from the fixed anvil carrying member. Another object is to provide depending legs at the rear of the spaced sides of themagazine to removably'straddle transversely spaced ears of the fixed stanchion and having alined openings including walls adapted to snap by and thereafter be removably but loosely interlocked with overhanging detents struck out of and laterally extending of the spaced cars; Another object is concerned with. staple driving means in the form of a one piece flat spring having an oiset rear taily portion anchored? to thek cover or cover plate, the latter also slidably guiding displacement of the driving blade and additionally acts to fairly close the top wall of themagazine, the one piece-spring Another object is realized in the provision of a 2.. having. an arcuate intermediate part sloping' upwardly and forwardly away from. the tail portion and including a. substantiallyy horizontal reach. from* which the driving bladedepends; the-arrangement beingsuch thatt the horizontal' reach` of the flat driving; spring. is appropriately secured against thetoprwall of` the cap while the arcuate portion of the: driving. spring includes a depending lug for retaining the upper terminal; of a normally contracted helical spring trained about a; sheave appropriately anchored*y to the cover whilethelower terminal of the normally contracted spring'is retained'by the slidable pusher guided by the magazine whereby if the cap be swung towards the magazine, thepusher automatically advances towards the front wall of the magazine and if the cap be swung' awayy from the magazine. to open the latter the pusher. automatically moves towards the rear of the magazine..

Other importantobjects, and functional; and structural.

Fig. 1 is a sideelevational view of the'stapling machine.

Fig. 2 is a front view of Fig. 1.

Fig. 3 is a rearview of' Fig. 1.

Fig; 4 -is a plan' viewfof. Eig. 1..

Fig. 5 is a perspectiveview or?l the staple pusher.

Fig.v 6l is a view similar. to Fig: 2:1: however exhibiting the sides of the magazine retained in a set position against divergence, by the. staple pusher;

Fig. 7 is a: View similar to Fig.. 5 but showing the swingable arm. swung. fully.l rearwardiy` to permit the stapling. machine to be: used as a tacker;

Fig. 8 is. an enlarged transverse sectional view on thez-line. 8;-8 of Eig. 6.

Fig. 9I is a perspective View. on. a smaller scale illustrating the. swingable arm disconnected from the anvil carrying base but. ready to' be assembled therewith.

Fig. 10 is an exploded perspective View of the base.

Fig.. ll is an. enlarged.longitudinal` sectional view on the line 11-11 of Fig. 4 however illustrating a stack of staples within the magazine.

' Fig. l2 isa fragmentary horizontal sectional view on the line 12-12 of Fig. 1.1.

Fig. 13' isatransverse sectional view on the line i3-13 of Fig. 1.

Fig.. 1.4 is. a side elevational view of the carrier comprising the normally raisedl staple. spring driving means anchored at: its rear end: tof the cover for the magazine.

iig. l5 is a front view of the. carrier on the line 15-15 of Fig;. 14.

Fig. 1'6 is a plan viewof. Fig.. 14.

Figi. 1'7 isa bottom view'of Fig. 14.

Fig. 18 is a fragmentary perspective ViewA illustrating the cover of' the carrier slightly raised from. the magazine.

Fig. 19 is a View similar to Fig. 18 showing the cover within. and.` closed relative to the magazine at which time the cover at its front endv is nested within the upper rim of the magazine.

Fig. 20 is= an exploded perspective view of the. magazine andA staple pusher, and illustrating the normally diverged relation of the sides of the magazine.

Fig. 21 is a plan view. showing the. manner of iiexing the magazine sides towards each other onl mounting the staple pusher therein.

According to the-.inyention,.the. stapling machine generally'designated'SM comprises an effective base B, pivotally supporting theswingable staple carrying armbroadly denoted: SA. Basel B: is preferably of sheet metal, appropriatelyl depressedA centrally thereof' to provide an inter:- rnediately. arranged wall 10 which includesf the centrally arranged boss or seat Mi extending above the elevation of front end 12..'y and rear'part; |15 thereof..

Integral with and projecting above wall lo are the spaced ribs ld. interconnecting the front ends of ribs l is lip ll' which extends above and is spaced from the front depressed end "i2 of the intermediate wall l@ and forms therewith gap i6 (Fig. ll).

lzxtending rearwardly of rear part 213 of Wall il() and integral therewith is a reduced web 17 (Fig. l0) which is 1pwardly oiiset and merges with the rearwardly ared i8 integral with the rear end of base B.

'transversely spaced and upstanding flanges or wings are integral with the body of the base B and are in longitudinal alinernent with the spaced ribs -fl.

Web and flared part itil are appreciably spaced from the bottom parts of the opstanding anges i9 and form the spaced openings 29. For strengthening purposes flanges are each provided with an outwardly extending boss or hollow rib 2l.

piece sheet metal member comprising rear wall 22 having the upwardly and forwardly curved crown portion 23 al .lnst which the transversely spaced ears of stanchion FS are arranged. Depending from crown portion 323 is the dcwnwardl/ and forwardly inclined web Z merging with. the biased shoulders or lips 26 extending upwardly l rearwardly from llat plate 27.

Reduced web and the flared part o the base B may be considered as an offset brace interconnecting rear part of depressed portion 13 with rear part ot' rim nd defines in part the spaced openings or relief pasways xtrrrupting the rear part of base B near 'flared part i3 is the positioning slot ZS which receives a substantially co: esponding cross sectionally shaped lug 29. Thereafter hanger or stanchion FS is rotated downwardly whereby tire locating dimple or projection 3@ extending troni rear part i3 of the bottom wall fr0 of. base is automatically received in the hollow bottom dimple or proon 3i ot il'tt plate 27 of the hanger FS. ln such relaplate also automatically positioned and received 'iin recess R termed by spaced ribs iti and rear part t i3 of the bottom wall i@ of the base. Thereafter 9 which is substantially normal to rear wall 22 ot hanger FT is appropriately spot welded to the base. By

' arrangement, stanchion FS is positioned on, interlocired with and eltectively anchored to the basc,

Subsequently the anvil carrying plate, broadly desighated, AC is assembled with and secured to base in this connection, it will be observed that plate AC is provided at its front end with depending downwardly sloping tongue 32. which is inserted into slot i6 under lip l5 of the base. Plate AC in width is substantially commensurate with the distance between spaced ribs id. Consequently these ribs automatically position plate AC when the latter is swung downwardly towards wall llt?, and by such action opening 33 oi ear towards the csr of plate AC is automatically received by the positioning dimple 3l projecting upwardly from the flat plate Z7 of stanchion FS. Thereafter an appropriate rivet 55' passing through anvil plate AC, plate 27 of stanchion FS, and bottom wall lil of the base, eectively anchors these parts together. As is well understood, anvil-plate AC at its front end is provided with an appropriate indented part dt) adapted to clinch the legs of the foremost staple S of a staple stack SS (Fig. 1l) as it is driven out ot the stapling machine.

Before specifically discussing the structure of the swingable artn SA, it may be well to mention at this time that after the swingable arm SA is completely assembled, and the base B has been completely assembled with its stanchion FS and anvil carrier plate AC, the arm SA which includes cap C may now be readily and swingably mounted on stanchion or hanger FS as desired. To this end, it will be noted that alined openings 4l (Figs. 11A, 26) interrupt the rear ends of the spaced sides 42 of magazine M and from these sides d2. (Figs. 11A and lili) the spaced legs dd depend. Legs i4 are provided vith alined openings (Fig. ll). Sides i2 and legs Ul of magazine M are adapted to rotatably straddle and embrace th transversely spaced ears 2d of stanchion YS. Ears 21E- are interrupted by the alined openings d6.

Spaced ears d'7 of cap C also rotatably straddle and embrace the spaced sides d2 of the magazine. Ears /t of cap C include alined openings d3 (Figs. 9 and 13) adapted to line up with the spaced openings di in sides of magazine lfi and openings il are in alinernent with the spaced openings lo in ears 24 of stanchion FS. it follows that iulcrurn pin FP may be conveniently inserted through alined openings dll of the cap, the alined openings l t magazine ll/l, and the aiined openings d6 oi stanchion or tulcrum support FS and thereafter appropriately upset to swingably retain the magazine M relative to is, arm SA may be swung to the position shown in 7 or the cap C may be swung rearwardly to fully n the magazine M as shown in Figs. 5 and 6 at which e full access may be had to the staple receiving chanornied by the magazine M as is well appreciated. Normally arm SA is in the position own in Fig, ll, that is, mag lt/i is seated on the spring loop L which is integral with and extends upwardly and rearwardly away from the sheet metal anvil carrying plate AC. By this action, rnagaz ne M is resiliently urged away from l e B. Also in this relationship dimples or detents dil or ears of stanchion FS are within openings 42S in the spaced legs fsf-l of magazine M, that is, c" ples gli are removably in locked 'within walls of ope Angs which are slightly larger than dimples S@ to permit pivotal downward displacement of arm SA although cooperating with walls ot' openings l5 to limit upward swingable and rearward displacement of tie magazine to its normal position shown :n Fig. ll. During pivotal displacement of the ine M, the upstanding flanges l@ or base B serves supplementary means to guide suol. displacement. Magazine M is formed out of a single piece of sheet metal and comprises the front wall Si and the spaced sides 42. Merged with and interconnecting sides 42 with the front wall 5l are the rabbeted portions S2 comprising spaced shoulders S3 extending laterally or" front wall 5l which preferably includes at the upper end the upwardly forwardly sloping lip 54. Within magazine M and spaced from and substantially parallel to the spaced sides l2 are the transversely spaced rails or upstanding flanges 55 which support the U shaped stack of staples SS. Each rail 55 at its bottom is merged with and connected to an adjacent side 4Z by a web 56. At their forward ends the upstanding rails 5S extend beyond webs 56 and towards but spaced from the inside surface of front wall 5l to form therewith spaced gaps 57 forming staple guide means or a raceway below the slotted staple driving blade DP depending from reach 5S of the depressible and at spring generally denoted DS having a downwardly and rearwardly sloping intermediate arcuate or bowed portion S9 from which rearwardly extends the i'lat terminal all fastened by rivet 6l to tail portion 62 of the cover or cover plate CP for magazine M. Tail portion 62 is offset relative to and extends above the intermediate part of cover CP.

Blade DB includes slot 63 receiving reduced neck 64 from which extends the laterally projecting lugl e5. Spaced portions 66 of blade DE movably straddle neck 64. Normally the flat depressible spring DS is in its raised position shown in Figs. 11, 14 and l5. The lower part 67 of slot 63 (Fig. l5) is contracted and the lower wall thereof cooperates with neck o4 to limit upward displacement of blade DB. Lip 63 (Figs. 1l and ld) at the front part of cover plate CP also guides displacement of blade DB which is further movably guided between the spaced lugs 69 (Fig. l2) projecting frorn flange 7th which carries neck 64. Flange tl (Fig. 14) is substantially asi-ansa normal to and integral with the spaced lugs or depending portions 71 (Fig. 15) bent up from the front part ofv cover platevor cover CP having the elongated centrally arranged slot 72. Cap C is anchored fixedly to reach SS- of depressible` spring- DS by the bent lugs 73 and. 7.3 depending from top wall 74 of cap C which is of sheet metalandhollow havingits front wall 75 spaced from and disposed forwardly of the laterally extending or T shaped lug 65 of cover CP.

The forward parts 76 of the spaced sides 77 ofthe cap however are spaced from sides 42 of magazine M while the rear. portions 78- of sides 77 closely but movably lit over sides 42 of the magazine. Ears 47 previously referred to extend from the rear portions 78 of cap C. By the arrangement disclosed, cap C carries bodily both depressible spring DS and cover CP but the cap C through the perforated ears 47 is also swingable relative to fulcrum pin FP.

Referring back` to magazine M, webs 56 and the rails 55 are interrupted by the spaced guide slots 79 whichreceive the inwardly turned lugs 80 of depending sides 81 of the staple pusher Pv slidably guided by and straddling the spaced rails 55 which are disconnected from each other.

Extending from pusher P is the hook H (Fig. 1l) retaining loop 83 at the lower reach 84 of the helical normally contracted spring S5 threaded through slot 72 of cover. CP and having itsintermediate portion trained over the fixed coiled Sheave 86. The upper reach of spring 85 has its terminal loopS7 retained by hook 8S depending' from arcuate intermediate part 59 of the depressible spring DS. If therefore cap C be actuated,l that is, swung back and forth, the slidably guided and staple pusher P will beA reciprocated relative to the spaced rails 55 of magazine M.

As previously stated the front parts of the spaced sides 42 of the staple magazine are interconnected with the front wall 5l by reason of the rabbeted portions 52. The rear ends of sides 42 however are free and disconnected from each other (Fig. 2l). Thus due to the resiliency of the sheet metal out of which the magazine is formed, the spaced sides 42 (Fig. 20) of the magazine are normally diverged. These sides, however, may be brought towards each other as shown in Fig. 2l, that is, swung or liexed relative to the front` wall 51 at which time pusher P is dropped into the magazine to straddle rails 55 whereupon lugs 80 of pusher P fall within slots 79 and under the spaced rails 55. Subsequently the finger pressure applied to bring the sides 42 of the magazine towards each other is removed and sides of the magazine automatically spring outwardly but such outward displacement is limited or restrained by the spaced sides 81 of pusher P which holds the spaced rails 55 against further spreading and consequently sidesv 42 are set a predetermined distance apart (Fig, 22) for reception of the staple stack SS. Rails 55 are each reinforced by a suitable longitudinally arranged rib 82.

Slots 79 which interrupt spaced webs 56 and rails 55 have' end wallscooperating respectively with the inwardly turned lugs 89 to limit forward and rearwardl displacement of slidab'ly guided staple pusher P.

Sheave 86 is' formed out of a wire comprising a plurality of juxtapositioned coils progressively increasing in diameter away from the central coils thereof and consequently defining a groove for appropriately receiving the helical spring 85 whichv urges staple pusher P forwardly when the cover is closed and consequently staple stack SS is urged towards the front part of magazine M. The end coils of sheave S6 terminate in ends 92 spot welded to front spaced portions of the cover CP.

Cover CP is a supporting plate for the depressible staple driving spring DS and is limited in its downward swingable displacement by the spaced shoulders 53 at the rear and disposed laterally of front wall 51 of magazine M, that is, shoulders 53' of rabbeted corner portions 54 serve as a stop means coacting. with iiange 70- of cover CP to limit such downward movement of cover CP at which time spaced lugs 93 bent inwardly fromthe spaced sides 42 of the magazine support the rear end or. tail piece 62v of cover CP. This relation is clearly shown. in Fig. 1l wherein also cover CP is slightly above the staple strip. or stack SS to prevent upward displacement of the latter, namely, to facilitate guiding and to hold such strip on the spaced rails 55. With cover CP resting against stop iangesk or shoulders 53 and supported by lugs 93, the cover closes the open `top of magazine, that is,

4spaced bars 110 thereof constituting the bottom of the cover are within the magazine but slightly above the staple stack SS to hold the latter on rails 55.

To permit the normally raised cap C to be depressed relative to both magazine M and cover CP when the latter is supported by lip 54 and the inwardly overhanging lugs 93 of the magazine, sidesy 42 of the magazine are provided with relatively large and transversely alined perforations 94 adapted to removably receive inwardly struck detents or ydimples 95 extending from the rear parts 78 of the spaced sides 77 of cap C.

On closi-ng of the pivoted or hinged cap C, dimples 95 frictionally but movably straddle sides 42 of the magazine and eventually snap into alined perforations 94 `to looselyv interlock therewith, that is, also to removably interlock therewith. To open cap C, that latter i-s grasped and swung upwardly, thus automatically removing dimples 95 from perforations 94. lf cap C be swung open, driving spring DS and cover CP bodily swing back therewith to provi-de full access Ito the staple receiving channel constituted by front wall 5l, side walls 42, webs 56 and spaced rails 55 of magazine M.

As already pointed out, the stapling machine may be readily converted into a tacker. This is accomplished by grasping swingable arm SA and swinging the latter rearwardly of the base to the position shown in Fig. 7. By such action legs 44 of spaced sides 42 of magazine M unlock from detents 5@ of stanchion FS which serves as an abutment cooperating with rear end 96 (Fig. 7) of top wall 74 of cap C to restrict rearward swingable displacement of cap C.

With the present invention, the carrier which comprises cover CP and spring DS, may be readily assembled wthV lcap C. In Ithis connection it will'be noted that slot 63 interrupting blade DB is adapted to conveniently receive the biased lug 73 extending downwardly from cap C, thereby automatically positioning cap C relative to spring DS after which lug 73 is projected through opening 97 interrupting reach 58. Thereafter lug 73 is bent upwardly and against the bottom face of reach 58 to firmly secure spring DS to cap C. Lug 73 may be considered also as a stop against which reach 58 is maintained.

Prior to inserting and upsetting rivet 6l and to facilitate assembling of the ydepressible driving spring DS with cover plate CP, tail() (Fig. ll) of spring DS includes locating opening 100 for closely receiving the cooperating dimple .101 extending `from terminal or tail 62 of cover plate CP.

By applying a downwardly directed manual pressure on cap C, arm SA swings downwardly against the resistance of spring loop L and blade DB drives the foremost staple out of raceway detined by spaced gaps 57 and against the indentedv portion 49 of anvil AC. Of course during downward pivotal displacement of cap C, spring DS is stressed. After the foremost staple has been driven out of vthe magazine and clinched against the anvil, the downward directed manual pressure formerly applied to the capl is removed'. Automatically thereafter loop L elevates magazine M and spring DS elevates blade DB 'and cap C. Upward swingable displacement of magazine M is limited by thet spaced dimples or stop means 50 otfstanchion FS. These dimples` coact with the lower portions of the relatively large openings 45 to limit such upward displacement. Openings #i also removably interlock with the dimples 51') to hold depending legs l-/iof magazine in movable straddling relation to the inwardly bent ears 24 of stanchion or fulcrum support FS.

Various changes may be made in details of construction and arrangement of parts without departing from the scope of the invention or sacrificing any of the advantages inherent therein.

I claim:

lA ln a stapling machine, a one piece sheet metal magazine `adaptr-:d to contain staples and provided with a front wall, spaced sides having front ends integrally merged with and normally yieldingly diverging away from said front wall, spaced webs disconnected from each other and integral with the lower portions of said sides and spaced from said front wall, spaced upstanding rails disconnected from each other and spaced from said front wall and substantially parallel to and spaced from said sid and disposed within said magazine and having their portions integral with said webs and normally diverged away from said front wail, said sides having rear ends adapted to be moved towards each other to stress said front wall and for shifting said rails towards each other, said webs and rails having longitudinally arranged and transversely aligned slots, a staple pusher having depending parts adapted to slidably straddle said rails to limit spreading of said rails away from each other for holding said rails and said sides substantially parallel to each other, `and lugs carried by said parts and slidably guided in said slots.

2. ln a stapling machine, a one piece sheet metal magazine adapted to contain staples and provided with a front wall, spaced sides having front en s integrally merged with and normally yieldingly diverging away from said front wall, spaced webs integral with the lower portions of said sides and spaced from said iront wall, spaced upstanoing rails disconnected from each other and spaced from said front wall to form staple guide means therewith said rails being substantially parallel to and spaced from said sides and disposed within said magazine and having their lower portions integral with said webs and normally diverged away from said front wall, said sides except through said front wall being disconnected from each other and having rear ends adapted to be moved towards each other to stress said front wall and for shifting said rails towards each other, said webs and rails having longitudinally arranged and transversely aligned slots, a staple pusher movably seated on said rails and having i encoding parts adapted to slidably straddle said rails to l t spreading of said rails away from each other for holding said rails and said sides substantially parallel to e i other, and lugs carried by said parts and slidably guided in said slots.

3. ln a stapling machine, a one piece sheet metal magazine adapted to contain staples and provided with a front wall, rabbeted corner portions integral with and at the outer ends of and disposed rearwardly of said front wall and comprising shoulders disposed laterally of and spaced from said front wall, spaced sides except through said front wall and corner portions being disconnected from each other and having front ends integrally merged with the outer ends of said shoulders and said sides normally yieldingly diverging away from said front wall, spaced webs integral with the lower portions of said sides and spaced from said front wall, spaced upstanding rails disconnected frorn each other and substantially parallel to and spaced from said sides and disposed within said magazine and having their lower portions integral with said webs and normally diverged away from said front wall, said rails having front ends spaced from and between said shoulders and spaced from said front wall to form staple guide means, said sides having rear ends adapted to be :loved towards each other to stress said front wall and for shifting said rails towards each other, said rails having lonitudinally arranged and transversely alined d slots, a staple pusher movably seated on said rails and having depending parts adapted to slidably straddle said rails to limit spreading of said rails away from each other for holding said rails and said sides substantially parallel to each other, and means carried by said parts and slidably guided in said slots.

4. ln a stapling machine, a one piece sheet metal magazine adapted to contain staples and provided with a front transversely arranged wall, rabbeted corner portions integral with and at the outer ends of and disposed rearwardly of said front wall and comprising shoulders disposed laterally of and spaced from and to the rear of said front wall, spaced sides disconnected from each other except through said rabbeted portions and front wall and having front ends integrally merged with the outer ends of said shoulders and said sides normally yieldingly diverging away from said front wall, spaced webs integral with the lower portions of said sides and spaced from said front wall, spaced upstanding rails disconnected from each other and substantially parallel to and spaced from said sides and disposed within said magazine and having their lower portions integral with said webs and normally diverged away from said iront wall, said rails having front ends spaced from and between said shoulders and spaced from said front wall to form staple guide means, said sides having rear ends adapted to be moved towards each other to stress said front wall and for shifting said rails towards each other, said rails having longitudinally arranged and transversely alined slots, a staple pusher movably seated on said rails and having depending parts adapted to slidably straddle said rails to limit spreading of said rails away from each other for holding said rails and said sides substantially parallel to each other, means carried by said parts and slidably guided in said slots, and spaced legs depending from the rear ends of said sides.

5. ln a stapling machine, a base, a stanchion at the rear of and fixed to said base and having transversely spaced ears, a one piece sheet metal open top magazine adapted to contain staples and provided with a front wall and comprising spaced sides having front ends integrally merged with said `front wall and rear ends straddling said ears, spaced webs integral with the lower portions of said sides and spaced from said front wall, spaced upstanding rails spaced from said front wall to form staple guide means therewith and said rails being substantially parallel to and spaced from said sides and disposed within said magazine and having their lower portions integral with Said webs, said rails having longitudinally arranged and transversely aligned slots, a staple pusher movably seated on said rails and having depending parts slidably straddling said rails, means carried by said parts and slidably guided in said slots, fulcrum means traversing said ears and the rear ends of said sides for swingably holding said magazine relative to said base, a cap having a top wall and having spaced rear end portions straddling said sides and swingably retained on said fulcrum means; staple driving means comprising a flat spring having a reach within and secured to said top wall, an arcuate portion integral with said reach, a tail portion at the rear of and integral with and offset relative to said arcuate portion, and a blade depending from the front end of said reach and provided with a gap; a cover plate bodily movable with said cap and below and spaced from said reach and having a rear end secured to said tail portion and including a front end having coacting means in part projecting through said gap for slidably guiding said blade and including spaced bars removably receivable in said magazine through said open top and between said sides, a coiled sheave secured to said bars` I', movable helical spring interposed between said bars and trained over said sheave and including ends retained by said pusher and arcuate portion, and means to limit the reception of said bars between said sides.

6. ln a stapling machine, a one piece open top sheet metal magazine adapted to contain staples and provided with a front wall, rabbeted corner portions integral with and at the outer ends of said front wall and comprising shoulders extending laterally of and spaced from and to the rear of said front wall, spaced sides having front ends integrally merged with the outer ends of said shoulders, a cover plate having upwardly extending lugs at the front end thereof, ange means projecting forwardly of said lugs at the front ends thereof, a capfor said magazine, fulcrum means pivotally sustaining said cap relative to said sides; a relatively at spring having a reach secured to said cap and upwardly spaced from said cover plate and having a rear portion offset relative to said reach and secured to the rear part of said plate, a staple driving blade depending from the front part of said reach; said ange means having means for slidably guiding said blade, and said ange means having means for cooperating with said shoulders to limit insertion of said cover plate through said open top and between said sides.

7. In a stapling machine, a one piece open top sheet metal magazine adapted to contain staples and provided with a front wall, rabbeted corner portions integral with and at the outer ends of said front wall and comprising shoulders extending laterally of and spaced from and to the rear of said front wall, spaced sides having front ends integrally merged with the outer ends of said shoulders, a cover plate having upwardly extending lugs at the front end thereof, ange means projecting forwardly of said lugs at the front ends thereof, a cap for said magazine, fulcrum means pivotally sustaining said cap relative to said sides; a relatively flat spring having a reach secured to said cap and spaced from said cover plate and having a rear portion oifset relative to said reach and secured to the rear part of said plate, an arcuate portion interconnecting said reach and rear portion, a staple driving blade depending from the front part of said reach and including spaced limbs dening a slot; said ange means cooperating with said shoulders to limit insertion of said cover plate through said open top and between said sides, a lip extending from said 10 plate and disposed below said flange means to facilitate guiding of said blade, and means carried by said flange means and in part projecting into said yslot to movably retain said blade against said lip.

8. En a stapling machine, a one lpiece open top sheet metal magazine adapted to contain staples and provided with a front wall, rabbeted corner portions integral with and at the outer ends of said front wall and comprising shoulders extending laterally of and spaced from and to the rear of said front wall, spaced -sides having front ends integrally merged with the outer ends of said shoulders, a cover plate having spaced bars and having upwardly extending lugs at the front ends of said bars, flange means projecting forwardly of said lugs at the front ends thereof, a cap for said magazine, fulcrum means pivotally sustaining said cap relative to said sides; a relatively at spring having a reach secured to said cap and spaced from said bars and having a rear portion offset relative to said reach and secured to the rear part of said plate, a downwardly curved portion interconnecting said reach and rear portion, a staple driving blade depending from the front part of said reach and including spaced limbs defining a slot; said flange means having means straddling said blade to slidably guide the latter, said flange means having means for cooperating with said shoulders to limit insertion of said bars through said open top and between said sides, a lip substantially at the level of said bars to facilitate guiding of said blade, and a T-shaped lug in part projecting through said slot for slidably retaining said blade against said ange means and lip, and projections carried by said sides to support the rear end of said cover plate.

References Cited in the tile of this patent UNITED STATES PATENTS 2,108,882 Cavanagh Feb. 22, 1938 2,264,322 Maynard Dec. 2, 1941 2,272,773 Maynard Feb. 10, 1942 2,399,761 Ruskin May 7, 1946 2,702,384 Ruskin Feb. 22, 1955

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