US2733440A - Stapling implement - Google Patents

Description

Feb. 7. 1956 R. w. JENNY STAPLING IMPLEMENT 3 Sheets-Sheet 1 Filed April 5, 1954 JNVENTOR: R oberl W/ezuy CLICLICI Feb. 7. 1956 R. w. JENNY STAPLING IMPLEMENT 3 Sheets-Sheet 2 Filed April 5, 1954 INVENTOR. R ob erb WA/enny /S XXX/(M a Sheets-Sheet a R. W. JENNY STAPLING IMPLEMENT Feb. 7. 1956 Filed April 5, 1954 2,733,440 I STAPLING IMPLEMENT ApplicationApril s, 1954, Serial No. 420,942

9Claims. (or. 1-49 i This invention relates to improvements in stapling im-' plements and more particularly to a power-operated stapler for fastening together various articles and bjects and tacking in place sheets of fiberboard and other materials. 1 V

One object of the invention is to provide an implement of the type indicated which may be held in one hand and applied to the work in various positionings while being operated by pneumatic or hydraulic pressure.

Another object of the improvement is toprovide a machine of the type indicated which may be used for driving staples having legs of varying length in accordance with the requirements of the work without necessitating any adjustment in the mechanism of the device ,Anotherobject is to provide ,a machine having means forpreventing the staples from jamming and clogging the throat through which they are driven due to misalinement of a staple therein or distortion inthe shape of the staple.

Another object is to provide a machine of the type indicated which is more convenient for loading with rates Patent staples andgenerally more efficient in use for various purposes. n p a The present improvements are embodied in an implement described in the following specification which discloses aspreferred form of construction ofthe machine, by way of example, as illustrated by, the [accompanying drawings. In the drawings:

Fig. 1 is a longitudinal sectional view of the implementshown with the essential elements of its mechanismin operative relationship and its .magazine'loaded with staples;

Fig. 2 is a fragmentaryside elevational view of the same showing thefstaple-magazine open for loading and illustrating the closure-abutment or nosepiece at the front of the magazine in part-section to show the throat through which the staples are driven;

Fig. 3 is a transverse sectional view of the fore part ofthe machine taken on line 3 -3 of Fig; l; t Fig. 4 is a perspectiveview of the closure-abutment or nosepiece which cooperates with the end of the magazine to form the vstaple-throat;

Fig. 5 is a perspective view of the staple-driver adapted to'reciprocate inthe throat of the machine; f i f Fig. 6 is a perspective view of .the forward jend jjof the staple-core and the staple-rest carried thereby;-

. V Fig. 7 ,is a gre atly enlarged sectional plan view of the"'iiosepiece for closur'e abutment for the magazine showing the, contour of the .throat and illustrating a staple lield therein prior to'its being driven; Fig. 8 is an enlarged vertical sectional viewofthe forward part the staple-magazine showing "the nose piecejor closure-abutmentwhich cooperates withIthe open end thereof and illustrating 'astaple in ,placejin the throat priorjt'odrivingit'therethrough; f ";".Fig. '9 is an enlarged perspective view 'offone form To staple adapted foruse with the present machine; Fig; 10 is an end view of the same indicating in dash- 2,733,440 Patented Feb. 7, 1956 "ice lines the angular displacement of the legs of the staple;

Fig. 11 is an enlarged face view of the nosepiece or closure-abutment for the front of the magazine showing a modification in the formation of the staple-throat;

Fig. 12 is a vertical sectional .view' similar to Fig. 8 and illustrating the modified formation of the staplethroat; and

Fig. 13 is a transverse sectional plan view of the closure-abutment and the end of the magazine similar to Fig.-7 butshowing the modification in the throat illustrated in Figs. 11 and 12.

'As herein illustrated and described the mechanism of the present machine is generally of the. same construction and arrangement as that disclosed in my prior pending applicationsfor United States Letters Patent, Serial No. 393,347, filed November 20, 1953, and issued as Patent No. 2,714,208, on August 2, 1955. This type of machine may be power driven by pneumatic or bydraulicpressure and manipulated in one hand for applying it to different types of work. For example-the present implement may be used as a tacker for fastening placards to a wall or other support and for fastening wallboard in place in the building arts. In other instances, it may be employed in various manufacturing arts for the construction of crates, plywood containers, for tacking screens to frames and for various and sundry other purposes too numerous tomention herein. ,The present improvements are particularly directed to means for guiding the staples through the throat at the front of the magazine to prevent their movement being obstructed, for example by 'misalinement of the legs of the staple, to jam therein and clog the throat and render the machine inoperative until the obstruction is removed, Most staples produced today are of excellent manufacture, uniform in shape and properly dimensioned to fit machines of the present type. However, due to careless handling or rough treatment, in

gether in strips or .sticks of"con venien t length for packaging and for loading them in the rn'aga'zine of a machine. When ajstaple is separated from the stick by the impact of the driver descending in the throat there is a tendencyiforit to rock or cantand incline its legs rearwardly so that their ends may strike the abutments projecting from the sides of the core to prevent' the staple from sliding downin the throat. In a condition of this character the impact of the reciprocating driver against the head or crossbar of the staple will usually cause its legs to be bent or distorted so that its passage through the throat is obstructed toclog themachine; or otherwise it may be driven out from the throat indistorted shape. To prevent such contingencies causing binding of a staple in the throat and clogging of the machine, or its malformation when driven thereflie w W ns imv tr -a a ie to tting the. sta les therein. .Br iecting rear valve-housing 3 communicating with the bore of a vertical eylinderfiin which is.a.piston. 4..connected tQactuate the staple-driver 5. A horizontal magazine 10 for the staples is pivoted midway of its ends on a strut 11 depending from the handle-merriber -ttdadapt ititd be swung about'its-pivotalaxis a's shown iri-tFig-AQ to ope it's'iforward end forloadiirg staplesther-eihto; At the-forward end of th'e ihi'plernent is a nosepiece 12 depending belowthe' cylinder-'6 a'iitl forrning a iixed or stationary closure-'abutmentfor the inaga zirie ifl when the latter is in closed relationship as shovvn in'Fi-gi -l The nosepiece-ori closure abutment 12 cooperateslwith the end of the -m-agazine 10 to -forma th roiit =15-throagh which the staples maybe driveh into the wo lhe' throat 15 consists in a novl-ednstruotion' and rrang'e mean oi -parallel groov'ewdirectly related to the' present improvementas will-be specifically described hereinafter: Sufi-ice into "state tliabthe stapIe-tiriver Fisi:onlreetedto thepiston'4 and"adapted to*be power-operated-td ferce it downwardly 'through the throat 15i to 'driye astaple "3 after *severing h'tfrom thejstrip 'b isticli indthe rnag'a zine -A-helical-"spring 16=located-within the bore ofthe cylinder 6 witli'eits lower end seated 'on :tfixli-skfl the bottonnthereof acts'to returrrthepiston'4; ,aiid" therby staple drivi'ng operatiorp";

structed -ar d arranged' substantially as *describedfinj'rny prior application; being} constituted by a hol lo'w troughs hapedmemher formed ofsheet rnetal with a'bottorn 2'3 an upstanding "sides, 24." A sta' incrqss-fsection extendslongitud rra l I fofl the'maga'zine 'l and ffllfl'fl'llgea t'o Tslidejfoifwardly therein wheri'th a g azinefisr opened (Fig.2) as described, in 'my iiprior japplication. ,fThe-"co e '25 is slid forwardly under the. tensionspring 'pocketedlifi borfliif block 28. iaste'ned tithe-r rward end jofithe e10 surrounding iihdlsl jdablel on 'a .pin{29. Form ,th'r 'd ngha slotfiijiin"the ore'lQZS to l lrmtnits orward 'slidingm'overnent' :ffhernember' 3'0 :mayihave; a crowned upper, face .31 .corres'ponding. to. the crown .or crossbar. of the" staple is (ljigs 9.)! with its, main: .portion extending .dow wa n t. te i. aflo tw ich s st art fromzthegnpper pottiehgist the rriembeia-h a jflanges. seamen. may .be f,welde.dg-orl, otherw se suitably .fast'enedto theinne ria ces of the-sides- 37 -of the core25. The vflanges 36. are recessed "along their sides to .form vshoulders abutting the forwa rd; edges of-thesides of th""core 25;and-'welde eto ina closefiushjoint By I o:

4' therethrough. Below this upper portion of the rest 'or member .30..,are ...sheinder d..ahnt nents. Q.. and. s iah lr therebelow the member is ftlrther widened by shouldered abutments 41 forming the foot '35. The front face of the member 30 is recessed with a vertical slot 42 bounded on its opposite sides by flat faces provided for an essential purpose later explained.

Referring to Figs. 1, 2 and 4, the nosepiece or closureabutment 12 is ofgenerally tap ered iform depending from a pair of @1847 which are bolted at 46 to the under side of. a horizontaL-plate-like member. 48 fastened in--the bottom of the cylinder 6. -The plate likernem-ber 48 is bored t r ceivest etlo shqu sleredendt the cylinder 6 to fixedly mount" it thereon 'with its main portion extending' r'earwardly andzrece'ssed at 49 to re ceive the ears 50 which project upwardly from the magazine 10. A cross-pin 51 extending through the ears 50, the end of the plate 48 and the lower end of the strut 11, suspends -the ma'gazine 1 01fromthe-main -handle p'ortion Z of the implement-{whileadapting/into pivotiaboutla oentral-axiss--This method of mounti'ng ithemagazinemn the im'plem'ent provides 'that it may :beirckedintoithh position shown in 'Fig. 2 for loading staples threinto through its for ward'i end wh-ile' adapting it tc r beheld rigidly -with its open end=closed by the nosepiece or abn't rn'e'nt 12fas shown in Fi'gi 1.

A latch -55 sli'dably mounted in a slot 54 on the under side- "of the"plate=inember-48 has a tape'red portion- 56 engageable through the-inclined-slot 5140f a looped keeper ss pm eenag upwardly fromLthe magazine -10; The keeper iii-is L-shaped with a foot- 59 weldedor otherwise fastened-to a I u shaped -sheet-metal member 60 extending longitudinally withinthemagazine lfi above' the core 25 (Fi gs. '-2 and'3 )1 -Themember60s'erVesas a eoverover lying the core 25'forfpreventing the staples from riding upthereom- The sides of the-members underlie-the inturned upper flanges on the sides 24 ot the magazinem. A heli'al spring p'oeketed i'n-"a bore 61-'-in%the"latch;55 with its-rearward end engaging theend of the slot 54 acts to-slide the latch-forwardly to engage-it-with-the Slot-57 in the keeper 58. A pair of pins 66 project from=the sides of the latch 55 through slotsqin the sides of the member 518 with their ends held in serrated plates -67 overlying the sidesof the "member. The-plates 67-"provid'e'finger-g'ripsforsliding the -latch 55 rearyva'rdlvto release its end from the keeper 58 whereby tcrpermit the forward end oftherriagazine "ltl to'be swung downwardly for opening it. A flatleaf spri'ng 68- be'ars against the top of th'e'forward portion -of the latch55*to frictionally holdit in released position. The forwarderidofithe spring 68 is bent downwardly for engagement with the keeper iss 'whe'n 'th'e' forward-end of "themagazine' 10' is swung upwardly so as to release the" frictional pressure of- S'aid spring and permit the latch 5'5fto beslid forwardly by its spring 65 for .loclgi ng the magazine in closed rela- 1liolisfiipl P 1 2 h s g' 16 i 6 l t z i jfll manner: the fo ar'd poifiono "1staple-restj3t1jfwill at ea er t de" fir o he nose or closure-abutment 12 t'o,=for'oe tl1eicor e'; 25jear= .wardly into the magazine e 10' .so' that eventually, asl'the weirdly nthmaga'zm 10; ;A h. calfspring 7.1a a ted to the pi'isher 70 atone end 6X16 f d'ja pointed toe 77 to engage with the staples for preventing their escape through the open forward end of the magazine when the latter is in open position. As shown in Fig. 2, the top of the staple-pusher 70 is formed with a series of notches 78 with which the toe 77 of the pawl 75 engages when the pusher is slid forwardly 'suiiiciently to feed the last staple from the magazine.

Referring to Figs. 3 and 5, the staple-driver 5 is in the form of a relatively thin blade reinforced by ribs 80 tapering from its upper end down to its lower edge. The upper thickened neck portion 81 of the driver 5 is T-shaped with a head 82 held in a slot 83 in the side ofthe piston t. Referring now to Figs. 3, 4, 7 and 8, the nosepiece or abutment 12 forming the closure for the forward end i of the magazine 10 is of novel construction as regards the formation of'the staple throat therein. The side of the nosepiece which faces the member 34 and abuts the end of the magazine 10 is formed with a relatively deep vertical recess S4having an intermediate convexly faced rib 85 projecting forwardly therein and extending longitudinally thereof; this part of the threat in the nosepiece 12 having an important function for engaging the crowns or crossbars of the staples as they are driven down through the throat. At either side of the projecting rib 85,are

tapering slots 86 for receiving the tapered ribs 80 on the driver-blade 5. With the tapered' ribs 80 on the driverblade slidably received in the slots 86 the laterally project-,

ing fiange-like portions 87 of the driver-blade 5 will slide in the main slot 84 of the throat 15 at the sides ofthe projecting rib 85.

The present machine, like that of my. prior pending application referredto above, is especially adapted for operating on staples having a crowned head or crossbar (Fig. 9) with its apex or peak at the center thereof. Staples of this type have certain advantages as set forth in United States Letters Patent No. 2,052,553 of September 1, 1936, the truss like form of the crossbar or crown c tending to distribute the driving force applied thereto to'properly set the staple in the'work and further servingto stiffen "and strengthen the whole staple. As another advantage, during the driving of the staple theforce of the driver exerted against the apex or peak a of the crowned head or crossbar 0 tends to flatten the head and thereby urge the legs of the staple to spread outwardly away from each other. For this reason the legs are caused to be guided along the sides of the throat without any tendency for them to buckle or bend inwardly and therefore a wellformed stitch maybe applied to the work;

- The crowned head or crossbar c of the staple s also has an advantage in connection with its use in the present machine which provides means cooperating therewith for preventing the staple from canting or tumbling, as it is sometimes called, and causing its legs to swing rearwardly to engage against shoulders or abutments at the sides of the staple-core. .With the present form ofconstruction the apex at (Fig. 9) at the center of the head or crossbar c of the staple s is caused to slide downwardlyin a straight course along the convex face of the central rib 85 in the nosepiece 12; The rib 85 is thus adapted to act as a fulcrum about which the staple may be rocked slight-' 1y by the leverage of the member engaging. below the apex a of the head c as the core'25 is resiliently urged-fob ward by the tension of the spring 26 (Fig. 1). As is usually 'provided the depthof the staple throat or recess 15 in the nose-piece 12 is slightly greater than the normal thickness of the wire in the staples to allow for variations in the diameter of the wire as sometimes occur. By this provision the spaces 92 at the sides of the rib 85 allow sufficient clearance to accommodate the slight tilting of I the staples. It will be'observed by reference to Fig. 7 that the two upper vertical faces 90 (Fig. 6) on the staplerest or r'ne'm'ber30 bear againstthe crossbar c of the staple atqpoints outwardly beyond its central apex a and due to pressure of the member 30thereagainst the tendency is to rock the staple about the fulcrum formed by the rib 85 engaging the apex a of the crossbar c. Stated another'way, the two faces 90 pressing against the outer lengths of the crossbar c tend to rockthe staple on the rib 85 as a fulcrum due to their leverage on the crossbar c at points below the apex a which bears against the rib. In this way the legs of the staple have a tendency to swing'forwardly at their lower ends, as indicated by dotted lines in Fig. 10, so that their ends will clear any obstruction at the rear of the throat during thefirst part of the descent of the staplethrough the throat or until they are guided by the widened lateral faces 91 on the foot of the member 30. The purpose of the extra depth in the recess 84 of the throat 15 (Fig. 7) will now be apparent, the relatively shallow clearance space 92 at either side of the rib 85 allowing the lower ends of the legs of the staple to swing forwardly, if necessary, in the manner and for the, purpose above explained.

The method of operation of the complete implement is explained as follows: To load the magazine 10 with staples its forward end is swung downwardly as shown in Pig. 2 after releasing its latch 55. Thelatch is withdrawn from the keeper 58 by grasping the fingerieces 67 to slide it rearwardly against the pressure of the spring the latch being held in this retracted position by the frictional action of the spring 68 hearing against its forward upper face. As the latch 55 is released and ,the forward end of the magazine 10 swung downwardly by rocking it about the pivot-pin 51 the staple-core 25 will he slid forwardly by the spring 26 on pin 29 as shown in Fig. 2 to. advance the staple-rest or.

time 1.2 abutting its open end. As the end of the mag azine swings upwardly the keeper 58 will strike against the downturned end of the spring 68 to releasethe pressure of the latter; on the latch55 so that the spring 65 will slide the-latch forwardly to engage it with thekeeper as shown in Fig. I As the forward portion of the magazine 10 is swung upwardly the staple-rest or member 30 slides along the forward face of the nosepiece or closure-abutment 12 to force the core 25 rearwardly in the magazine 10 and withdraw the member 30 into the position represented in Fig. 1. As the magazine 10 is closed the forward end of the detent-pawl strikes against the disk 7 in the bottom of the cylinder 6 to rock thepawl and release its toe from the staples. The staples s are thus released to be fed forward by the advance of the pusher70 for delivering the foremost staple into the throat 15beneath the driver 5.

Referring now to Figs. 7 and 8, it will be obser ved that as the member 30, at the end of the core 25 is urged forwardly by the resilient pressure of the spring 26 on the core its faces 90 will engage against the crossbar c of the staple s at two points spaced outwardly from the apex a of the crown which bears against the projecting convex face of the'rib in the throat 15, see Fig. 7. This engagement which occurs as the staple being operated upon is driven down along. the front of the rest 30 by the descent of the driver 5 applies a leverage to the staple due to the resilient pressure of the member ,30

- against its cr'ossbar c at points outwardly beyond and be low the central apex a, thereby tending to force the lower ends ofthe legs of the staple forwardly.- It is obvious that only a slight tilting or rocking of the staple maybe necessary to clear the lower ends of its legs from the abutments 40 on the sides of the member 30, the' spac'ei92 at either side of the rib 85 (Fig. 7) in the throat 15pm viding a clearance forthe lower ends of thelegsto if the staple is canted in the manner explained above. I The depth or width of the space 92 is somewhat exaggerated in Fig. 7 to more clearly illustrate the arrangement of the v ltheie'nd of the member '30 and -the opposing face of-the c' tio'irso*that -shouldthe staple bezmalformed withsits legs bent ou t ofalinernent there -wonld still rbe roont for manner as'toadaptrtheOther'leg'to escape striking the abutment 40'o'n'etheside of thecore25. v 'l lt --will be "apparent from; :the foregoing description that the presentimprovement in the construction otthe throat=fis furtherrecessed by deeper grooves'95 in the u erp'a'rt ofthe-*throat --W hiIe this added clearance is hsuallyunnecejssary it may be provided as' 'an added preimplementyandfits method-of functioning insures unhampered-passage of thestaplesf-through-the throat as jthey are 'tlriven by the descending driver so that staples i'o'f the present type may be effectually applied to the work in: propenform' to secure arnoresatisfactorystitch. It iwill -be pndersto'od that-the present machine will'operate with equal advantage using staples of somewhat different shape; from that herein illnst-rated, for example the head or p jossbar of the staplemayhave 'an arched-ctown in- "stead offlbeing'p'eaked at-the center.

3. In a stapling implement having a magazine for containing-.-a supply-10f staplest havingcrowned Crossbars-,3 a closure forlthe fobwarde'endmf -:said;p1agazine:,provided with a recessed threat; for, receiving. staples 5fd .from;the magazine,*-.and a driveritreciprocable .in said ethrqat for driving the staples .rtherethrough'to. apply gthemgto the work, said closure lfoiztthe 'irnagazine provided. with a a central rib extending lvertically;through its throat; and projecting into said-gthroatifor ienga'gernent ;with ithe, highest ,1portion-or peak oftthe crowned; crossbar ,of ;a:,stap1e, 'meau's'-slidably mountedtatthe :forwardend oi the magazine and havingaspaced apart facestadapted toengage thevcrossbar ofilsaid stapleat points spaced laterally-and downwardlyfrom its peak; and resilientvmeansnfor-i slidi-n-g- -'said:m emheiz-rtoscause itlto nexert a. lthrustzzonnthe staple as the lattenis. driven tending -.to v;rot;:k, ;the staple about theirib as a fulcrum:whereby.its.legs ,will ,beprevented from cantingerearwardlytto.encounteran obstruction in passing throughthezthroata e t 1 t .nii In afstapling machine having a magazine open at its end, a core slidahlellongitudinallywithinnthee-magar zine; and adapted to isupport; a series-of crowned staples straddled thereacross; a closureabutment lpositionedr opposite the -open end of the magazine ..and .iormed with a recess providinga throatithrough,whichithe staples may be driven, a"-reciprocatory.1driver;f0r'driving the staples The 'presentimprovement provides for eflicient operanon of the -=i rriplement=for continuously- -driving and set- "ting the staples--in the work without danger of a staple becoming jammed iii the throat to clog and prevent-the operation o'f'-the-.machine. Moreover, the machine may be operated with staplespf varying jiistment ot iits mechanism; 1 While the"i'rnproverr1entis herein shown and described as ap'plied' to a particular type of stapling implement, it will be understoodthat it is susceptible of other applicatio'risffor diflferent'types ofxinachines 'and variations-may 'be 'rna'de in the' structure and arrangement ofthe mcha- 'nism-thereof withoutdeparting from the scope of the in- "ventionfas -expressedin the-appended claims. Therefore, {without limiting-myself in this'respect, I claimrlzflna'"staplingflirnplement having a staple-driver for driving crowned staples into-the work and a magazine for thefstaples may; be driven, said recess provided with" a progressively'feedingthe staples tosaid driver, a memberv havinga slot likerecessforming a threat through which size without any 'ad- I through said throat,- saidurecess'jin, the closure-abutment formed with-a rib extending verticallyzthroughout its length centrally thereofl-and .having a; convex afaCe-PIQ- jecting i into saidtthroat for engagement .with thepeak of the crowned head of a staple, means at thejend of ithe slidablecorea'fon engaging.- said head ofthe crowned staple: at points spacedelaterally and 1 downwardly from its central peak, and resilient means forslidingthe co re to cause its :end .to. pressagain'stthe, ends of, the head "of the staple'in a :mannerz'tending :to rock its legs :fortwardly to-ipreventvthem from striking against. any obstruction; at .the rear; of the throat Eduring ,thegdriving of Saidstaple. i i l i ln a1 stapling mach'ne, a supporting member. having meanstherein for actuatinga staple-drive amagazine-pivoted to. said-member 11:0. adapt it-'to-;be swung toexp0se-its openzend forzreceiving a supply of staples,

a; nosepiece': onsaid supportingmember 1 adapted to over- -'c'"e ntral*vertical longitudinally eirtending ribh'aving a conveXfaceprojectinginto said throatfor engagement with @the' erossb'ar ofastaple at'the center: of-its crown,- and resiliently-operated means for engaging-said" crossbar of f the staple 'at points spaced laterally from its center and sligh 1y below its apex-avhereby'said means-tends'to cant fth taple:to"displace itd-legsfforwardly for preventing fds fromencountering any obstruction atathe rear 5 1b et'o impede" thepassageof: the staple-through the throat p -2."In a stapling machine having a staple-driver, a magazine -for containing crowned staples, and meansin the gazine for --fe'edi ng th'e --staples "progressively 'beneath di staple 'driver,"a l nosepiece atthe front of themaga- 'ne havingarecessforr'nihg a'thro'at for receivi ng staples w, 'or'ifthejnagazineysaid-recess having a central conive): facedyertiQalrib projecting into said'throat-foren- "gaging against the central highest-point on the crowned rdssbar"of fa staplegmea nsfslidably mounted at the end of I, e magazine and formedfwith portions adapted to engage the Cl'QSSbfll"i0f flhfi fstdill" al points s aced aterall '65s and below {the cent-e1 .of its rorowh 1d lie ithe openend of the magazinet when the latter ,is 'swung upwardly-into closed relationship, ,said nosepiece iormed -with aj slot-like recessextending; vertically; to provide a staple-throat opposite: end; of the magazine, means for feeding crowned-e staples I-lll; the magazine to: deliver thm-qintoisaid :throat; said throat formedgwith atrelaetivelymarrow rib extending,-;longitudinally thereof. and projecting. into the center :of the throat .for engaging with :theecentr'zt-l'fhighesh portion of thescrowned head-,of a staple-,tdcore int thesrnagazine for: supportin the :staples iin; straddledlrelation thereon a .niemberslidably,rnounted at the-front; of, the-magazine; resilient: means'forsliding .ingatsaid :rlriverg;v agmagazine; mounted .on -said rnernher eand provided-with an, opening at its end, through which .the;staples..-may-be.=, loaded into the magazine, a core zextending;longitudinally within .the; magazine and slid- :ablelflcirwardly therein; means for,- feec l i ng-;the crowned taples -algngi the; core ztosdc er th m; e l ilh esta hidriverr arcl s rcrahut e. q psre a c with a central convex rib projecting into the throat for engagement with the crowned head of the staple at its highest point, a staple-rest at the forward end of said staple-core formed with a depending foot and having a relatively shallow recess in its forward portion forming opposite spaced faces adapted to engage the crowned head of the staple at points spaced laterally outward and downward from its peak, and a spring for advancing the staple-rest towards the throat in the closureabutment.

7. In a stapling implement comprising a handle-member mounting a reciprocable staple-driver and having power-means for actuating said driver, a staple-magazine pivotally mounted on said handle-member with its open end adapted to swing away therefrom for loading staples thereinto, a core extending longitudinally within said magazine and slidable forwardly therein, a spring for sliding said core in the magazine, a nosepiece depending from the handle-member and formed with a recess adapted to cooperate with the open end of the magazine to form a throat through which the staples may be driven, means in the magazine for feeding crowned staples along the core to deliver them into the throat beneath said driver, said recess in the nosepiece having a central convex rib extending longitudinally thereof and projecting into the center of the throat to adapt it to engage the peaked upper portion of the crown of a staple, and a member mounted at the forward end of the staple-core to slide therewith and provided with a shallow slot forming spaced-apart faces adapted to engage the crowned head of a staple at points spaced laterally outward and downward from its upper peak, said last-named member being resiliently urged against the crown of the staple in a manner tending to rock the latter on the rib as a fulcrum whereby to prevent the legs of the staple from being canted rearwardly.

8. In a stapling implement for applying staples having crowned heads, a staple-driver, a magazine for containing staples having crowned heads or crossbars, and means for feeding staples from the magazine to the driver,

said implement having a slot-like throat through which the staples may be driven, said throat dimensioned to provide a clearance at the front of a staple and having means projecting into the center of the throat for engaging the head of a staple at the highest point on its crowned head, and resiliently-operated means for engaging the head of said staple at points below the point of engagement of said projecting means therewith, said resilientlyoperated means acting to apply pressure to the staple tending to cant it about a fulcrum at the high point on its head whereby to prevent the ends of the staple legs receding to encounter any obstruction at the rear liable to impede the passage of the staple through the throat.

9. In a stapling machine for operating on staples having crowned heads or crossbars, a magazine for holding a supply of said staples, a driver movable relatively to the magazine to drive the staples into the work, and means for feeding the staples from the magazine to said driver, the combination therewith of means at the end of said magazine forming a throat through which the staples may be driven, said throat having a relatively narrow longitudinal rib projecting into the throat from one side thereof with parallel slots at the sides of said rib, and resiliently-operated means on the opposite side of said throat having laterally-spaced projecting portions adapted to bear against the crown of the staple below that portion thereof engaged with the projecting rib in the throat to exert pressure tending to cant the staple for displacing its legs forwardly so as to prevent the ends of the legs from meeting any obstruction during the passage of the staple through the throat.

References Cited in the file of this patent UNITED STATES'PATENTS 1,845,186 Raeburn Feb. 16, 1932 2,117,741 Polzer May 17, 1938 2,117,742 Polzer May 17, 1938 2,632,889 Beecroft Mar. 31, 1953 FOREIGN PATENTS 300,448 Germany Sept. 11, 1917

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