US2661999A

US2661999A - Hammer type stapler

Info

Publication number: US2661999A
Application number: US242246A
Authority: US
Inventors: Abrams Morris
Original assignee: Arrow Fastener Co LLC
Current assignee: Arrow Fastener Co LLC
Priority date: 1951-08-17
Filing date: 1951-08-17
Publication date: 1953-12-08
Anticipated expiration: 1970-12-08

Description

M. ABRAMS HAMMER TYPE STAPLER D ec. 8, 1953 2 Sheets-Sheet l Filed Aug. 17, 1951 INVENTOR.

ATTORNEY uma ml Y 11g. 17I 1951 TYPE: STAPLER 2,661,999

2 Sheets SA heet 2 MORRIS ABRAMS Patented Dec. 8,

TYPE s'rmmnt Morris YiAbrarns, irnoklyn, L assis-nor no il This invention -irelates to hammer :typerstaplers forftaokerys.

-An object 'of this invention :is to provide ,fa stapler -or taeker of 1#the character described ,com-

prising -a Yframe Emailing a handle extension, .a

plunger VAsiidaibly :mounted on the frame, .a .driver bar pi-voted to the fframe lat :its mear .end and n=havingat{itsiront-endza.portion adapted :to strike thesrface-which -receiveslthe-.staple, and a .driver levervpivoted medialiy the ends thereof to :the trame' and -pivota'l-y connected .at its :rearend to an in-termediate portion of -the driver har Aand A-engagirng -at -its -f'ront end, the staple .plunger, the arrangement being :such that when the ztacker is struck against akfsuriace, 1the `driver `Abar :is rotated about its ASfulcrnm to .cause 4rotation .of 1the driver-lever, whichfin-'turncauses theiplunger todescendorfcirivingerstaple.

A 'furtherobiect oifthis invention is itoprovide al-hammertype:stapler-lor tacker Aofthe-character described-whichis soiarrangedithat alittlemovement-oi the-driverbaikwiltcaseaffastzniovement 4"of thejplun-ger :througha gr'eaterzdistane, therebt7 Lgiving`-pro1cer lmomentum necessary to drive the staple.

front cover and the driver bar .togetherahsorb :the shcck at endbi :the-stroke.

Still e, further fobject of xthis :invention to provide in :a .devicnf :the character rdescrbed, atop cover .cap which can beused as a hammer `When 'itheztacker is iturnedraround, saidat'np( cover reap :having nneans linterlock iwith the iront never andr being further providedlwitll na naar ,extension to eoyertheitopof the frame.

zYet a further object lof .this invention 42.0 provide .in a itacker of the character described, r"a.unitxediinrtheiixhntiofethe-,frame lwhich shall have means to A:serve as .a :back stop for the Lplunger, .v-rneans `:to seweras'hhottomestop 'iorthe plunge-r, .and which shall Valso scrive ital-hold .down

A ller vichanr'iei forming .a .staple magazine for said Ydexlice."

Yet L-anotl'ier objectief this invention to ipro- .vide a Stacker mfithe ycharacter .describeda irame, sa combinationback rand .1' bottom plunger stop .rxed within :the iframe, ,and a Front cover *.Yet a "further object =of this :invention :is to provide a hammer -type 1stapler 4or' .ltacker of the character describedfin Iwhich vthe driver X-bar :is relatively long and its rear `pi-votezdfend V.is disz:posedvveil iii-back ofthe driver ilever, and the driver lever havingV a relatively` short -arnI-pivoted *to 9 the driver --bar-and va longer arm "engaging the plunger, the arrangement being such `that when fthetac'ierl is struck' alstapie is drivenwith.v ooncsiderablre force toinsure proper Adriving of the staples.

.-Aifurther obj ect of :this invention 9is9to provide in a `.stapler 4 or tackerrof .f the character described, Janririver lb ar.having aflat Ystriking surface atv its ffront lend so arranged :that it Lwill @not dig into thefrnaterial ofthe surfacestrueksaid iatsnrieee Lfuribermore :being inlined :inwardly en@ upwardly *benarde :0f fthe taeter is ein z honlzontai position, ,and when, ,said,i'jiat 'snrfac'e ,is at. againstthesnrfaoe to be str ,uek thehan- R dleis inclined nnpwardiy ,and rearwardly so gas ,i0 give SPa-ce `iorthe 1i. fthehan'clev after fully striking, to lnfialge f rfrnore jeomcrtableuseQ'ilieiadkeri .Yet a; further @bien 'Qf thisnveniien'istqprovide'in a device of fthe character described," a front cover 4having Aa `forwardly and nb'wardiy tapered `lower end which iollrows the Qi yth Sfrli'ng lsuriace Yof thegdriverfbanafter striking, "the arrangement being --suen-thatthe 555 anime. v11;"

athelfront cover to thegframe, aal'nd also to :sustain the v,inner `back stopiior ".the fpl'ung'er .within the ...f-rame., and falso to ,-aet; as a bottom stop for .fthe .driver lever, fthe `arr-rangement being ,such that the driver liever .-,wil'it ithe" pin vlgxeore hitting therbottonnstonuntilithezpin wears.

Yet a further object :.of rthis Jinlventionris to provide .a gstrong, .rugged .arrddurablezhammer type 'tacker ofrthe character described, @which shall tbe :relatively fxpnsive to fmanufactre `which sail'be fsuife andlios'itive in' foper'ation, easy :to manipulate, fand yt' #practical Landeni- `cientftoahgliiglfee A' Other objects 'cf this invention will 1in part be ,obvioussandiinfpart herinafterepoihtedfont.

{iE-he f-invntion Aaccordinelyl consists :in the fea,- =itnres :o'f constretin, coinbinations fof elements, and arranement fof vrparts', iwhic:h`-.1vvi11VVV be exem- Ypiiedj'in.-the-Sconstructiorfifieieinafteraidescrilcid. and of whiehthes's'cope (ininvehtionwill;heimlicated in the following claims.

In Ithe accompanying drawings l'in which are 'shown various .Jiliustnative embodiments of :this invention,

Fig ili'is afloneitudinalaverticaixzrossfsectional View lof 1a thammer :rtyp'e taok 1ernlziods'ring nthe invention;

Y@Figf bottonipianwiewiotftheideviee shown Fig. 4 is a partial side elevational view of said tacker with parts broken away and in crosssection;

Fig. 5 is a cross-sectional View taken on line 5--5 of Fig. 2;

Fig. 6 is a cross-sectional view taken on line 6-6 of Fig. 1;

Fig. 7 is a front end view of the device embodying the invention;

Fig. 8 is a cross-sectional view taken on line 8-8 of Fig. 4;

Fig. 9 is a cross-sectional view taken on line 9-9 of Fig. l;

Fig. 10 is a cross-sectional view taken on line lil-I0 of Fig. l;

Fig. 1l is a cross-sectional view taken on line II--IIofFig.l;

Fig. 12 is a cross-sectional view taken on line I2-I2 of Fig. 1; and

Fig. 13 is a cross-sectional view taken on line 3-I3 of Fig. 2.

Referring now in detail to the drawing, I0 (Fig. 2) designates a hammer type stapler or tacker embodying the invention. The same comprises a combination frame and handle member II. Said member II comprises a bottom wall I2 from which extend upwardly a pair of parallel side walls I3 (Fig. 1). The bottom wall I2 has a rear edge Ili. Said bottom wall I2 is formed, forwardly lof its rear edge ifi, with an lei-shaped cutout or opening (Fig. 3) forming a pair of tongues Il projecting toward each other, and pairs of spaced shoulders I8 on opposite sides of the tongues I'I. At its front end said wall I2 is formed with a forwardly projecting tongue I9 and a pair of aligned spaced shoulders or edges 20 spaced rearwardly of the tongue lil.

The side walls I3 (Fig. 1) are similar to each other and have at their rear ends, upper edges 2l parallel to the bottom wall I2. The upper edges 2l extend from the rear end edges 22 of said side walls I3 forwardly about one-half the length of said side walls, forming portions 23 of uniform height. At the forward ends of the edges 2| are upwardly curved edges 24, and extending from the curved edges 24 are upwardly and forwardly inclined edges 25, terminating in upwardly curved edges 2B. Extending forwardly from the upper end of each curved edge 26 is a top horizontal edge 2l. ExtendingA downwardly from the forward end of each top horizontal edge 2 is a front vertical edge 28 (Fig. 4). The edges 28 are disposed forwardly of the tongue I9.

It will now be observed that the side walls I3 of the frame II have front generally triangular portions S (Figs. 1 and 4) which extend from the rear or handle portions 23 of the frame. At

`the front of the triangular portions 30 are generally rectangular portions 3I (Fig. 4). The side portions 3I of the side walls I3 are formed with aligned horizontal slots 32 extending rearwardly from the front edges 28, for the purpose hereinafter appearing.

The side wall portions 3| are furthermore formed with outwardly pressed extrusions or prongs 33 (Figs. 2 and 8) below the upper end edges 2'1, for the purpose hereinafter appearing. The extrusions 33 are disposed rearwardly of the front edges 28.

The side walls I3 of the frame are formed with through openings 35 concentric with the curved edges 24 (see Fig. 10). The edges 25 (Figs. 1 and 2) Vof the triangular portions 30 are furthermore formed near their upper ends with aligned forwardly extending notches 36, for the purpose hereinafter appearing. Said side walls 3B are furthermore formed with aligned through openings 31 (see Fig. 5), disposed forwardly of and above the level of openings 35. Said side walls Sil' are furthermore formed With aligned arcuate slots 38 having a center of curvature at the axis of the openings 3l, and disposed rearwardly thereof. The rectangular side wall portions 3I of sides 30 (Figs. 1, 2 and 6) are formed with aligned lower openings All and with aligned upper openings 4I spaced vertically above the lower openings 4U.

` The lower openings lill are spaced above the level purpose hereinafter appearing.

Fixed within the bottom of the frame is a longitudinal filler channel member 5() (Fig. 11).

'.guide channel 2i). 'tom wall EI (see Figs. l, 2, 6 and 10) contacting rthe upper surface of the bottom wall I2 and spot welded. or otherwise fixed thereto. upwardly from the bottom wall 6I are side walls '52 parallel to and spaced inwardly of the side yWalls 52 of the filler channel member 5d. bottom wall Ei is cut away as at 63 (see Fig. 11)

The same comprises a top wall 5I spaced parallelly above the bottom wall I2 (see Figs. 2 and 6). Said top wall has a groove Sla (Fig. 2) at its front end to form a track for a plunger blade, as will appear hereinafter. Extending downwardly from the sides of the top wall 5i parallel side walls '52 (Fig. 6) contacting the inner surfaces of the side walls I3 of the frame member II and being spot welded or otherwise xed thereto. The

'bottom edges of the side walls 52 of the ller .channel member 5@ (Fig. 1l) contact the top surface of the bottom wall I2 (Fig. 6). Said side walls 52 have tongues 54 projecting downwardly into the opening I6 (Fig. 3), and the ends of the v.tongue 54 contact the shoulders I8 of the bottom wall I2, so as to prevent longitudinal move- 'ment of the inner channel member relative to the frame. At their forward ends, the side walls 52 have downwardly projecting tongues 55, the rear edges of which contact the shoulders 20 of the bottom wall I2. The front edges 5 of the side walls 52 are aligned with the front edges 28 of the side walls i3 of the frame. The top surface of the top wall 5I is at the level of the lower `edges of the slots 32, for the purpose hereinafter appearing.

Within the filler channel is an inner staple The same comprises a bot- Extending rfihe above the opening I in the bottom wall I2 and the side walls t2 thereof are formed with downwardly projecting tongues 6l. (Fig. 3) having -end edges contacting the shoulders I8 of the bottom wall I2. Said tongue 613 furthermore contacts opposite sides of the tongues i'i (Fig. 3)

'thereby centering the inner or guide channel B relative to the frame and preventing lengthwise movement of said inner channel.

The bottom wall 6i of guide 32 has a front edge 55 (Fig. 1) aligned with the shoulders 20 (Fig- 3) and the side walls 32 are formed at their front ends with downwardly projecting tongues B6 (Figs. 3 and l2) contacting opposite sides of the tongue I9 (Fig. 3) and also contacting at their rear ends the shoulders 2t (Fig. 3) to further center the inner channel relative to the The front edges 67 (Fig. 3) of the side walls t2v of inner guide kchannel B0 are disposed rearassises here.

4iiirfy'-suitahlepu'slf1"er means vmay he provided, not shown,A "and 'it-he lrear end of fthe magazine mailing-'closed many soitanlemanner, not shown.

ittedpver 1the lfront of lvthe j'frame "-'I`I `a Tfront cover TH). Said 'front 'cover :If comprises affront -walllfiil :fromw'hieh lextend "rearwardly, parallel isidewalls *12 :(seeFigf'S). L`The-ffrontfwall conthrough openings 85 registering withthe'openiin'g'sl'II flin the Yfs'ide walls 3| fand extending through said registering openings issaA 1bolt, pin

' or rivet 86 serving to x the top coveri8'01tothe iframe.

:Extending downwardly-and :rearwardly 'from rtheitopxwall 1M :isi'a .wallmortionlcontactingthe curved edgeszo .theirame .andiextendingirom saidf 'eurveol'.wall` adownwardlyand rear- -.wvardaly inclined wallieontacting-fthe topredges @Eig.: Extending A@from said @wall =s8 :are ideflangesfl!) contaeting the outer fsurefaces* :of fhefsi'delwalls 30 the'frame. --iSaidff'flan-ges@ fare lform'ed-withv openings registering *with openings 42 to receive boltsor Vscrews-i913Etherelthrcmgli 4for further xin'g the ftop Vliever vto @the frame.

Fixed within :thelf'ront `portion fof ithe ffframe iis a combination baok :stop .and bottomsstop iunit f9lI. -Said -unit 9 1 Lcomprises a bottom lwall 1112 `disposed in the 1planeof th'e vslots '3-2 and contacte ing the top surface of wall 5I of the Stiller Ghannel 50. 'Saidbottom'wa'll 92 has .atiitsrOnt-fend, 4'side wings 93 yreceived. within the `slots 32. Said :bottom wallf92 has :a frontedgeifl contactingithe liront -wall 'II ofthe front lcover .7.0. `The iront I`edge S94 vis fformed with fa :groove or :slotf9'5 .regisitering with'the :groove 51a to vform the 'tracklor throa'tforza plunger Ebladeldrivingfthe staples, as willeappear hereinafter, l

'Extending upwardly from ther-bottom wall v2 :are lparallel iside wal-ls Ycontacting `the :inner sur'facesof lthe side walls 31. V-Sai'dfsidewall's 96 lare formed Awith vertical-1y aligned openings 9=I and 98 'registering with the `openings 4I iandoi,

respectively, fand receivingtherethroughthebolts orrpins 96 and :18, respectively, thereby xingthe iframe.

.Slidably mounted A-witlfiinthe vframe v:and Lbetween the 'front cox/verand hef-unitil is a plunger assembly '|2530 ([see Fig. 1). f-Sa'lidipiunger-assernky lili) comprises a box or metal-stamping'flh vrLThe latter r comprises a -frontlwall F92 f'froin `which eX- tends 'rearwardly a hottorn v-wa'll li-'anlI parallel -Vside walls IML side :walls 11M yfaire 'forined with .aligned through =openings "mi r-'eeeiving therethrough ahorizontalpin |05 paral-ieltofithe IGZ is formed withvforwar'dly pressed -or extruded portion m1 yfor Vthe `pur-posehereinafterappearingA Therear edges ofthefsideavalls m4 sl-idahly engage fthe unit S I Riveted f-to the front vsurface of fthe |39 adapted to project down through-fthe register# 11| o`f the front cover. The-head lef 'the 'ri-vet moves 'through the re'eessxformed by the "foie award'ly recessed portion 'PS8fofthef-frontwailothe f front cover.

Means 'is 'provided ifor lr`ivingfthe plunger when the frame is-fhe'ldl byits'rearihandl-e endandthe "forward head end. 'of the frame is swung against `a surface into whieh-ais-taplfeis 'to'be driven. vTo this :end there extends through the 'registering fopenings-ni'the si'e-wails offt'he iframe: (seeFig.

,10) a bushing SI I contacting the npperesurface I -i-s "a "driver `armorinar I f 2. *The `saine eompri'sesafpairfofparallel side wallv portions IIE lforrnedfwith Asuitalcvle y bearing apertures 'through which the bolt HI gpasses.

The bolt III mayhaveA aheadfat"one-end anda nut -at the v'other endwontacting the "outer sur- 'facesof the side walls-H3.` Thesidewalls I i3 are disposed parallel'*to and' somewhat spaced -I I!! which are-inclineddownwardlyandforwardiy 4*to a point below the undersurface 'of fthe' bottom '75 iwal-1-l I-2fof the framefwhenthe-tacker isdn/normal position. Said side walls I I3 are furthermore formed with upward extensions II5 and the latter are formed with aligned through openings I I6 registering with the arcuate slots 38 in the side walls 3i] of the frame. In normal position the openings I|6 are adjacent the lower ends of the arcuate slots 38.

At the forward ends of the parallel walls II3 are outwardly extending shoulders |I'I from which extend forwardly parallel side walls Iiii spaced from the side walls 12 of the front cover i0. Said side walls H3 are interconnected by a front wall IIS spaced in front of the front wall 'II of the cover. Extending outwardly from the lower end of the side walls I I8 and from the front wall Il a fiat flange disposed in a plane inclined upwardly and forwardly and disposed Vbelow the lower inclined edges 'M of the Side walls of the front cover. When the rear handle end of the frame is grasped in the hand, and the iront or head end is brought down against a surface S, it is the ilange |23 which will strike said surface thereby swinging the driver bar II2 upwardly in a clockwise direction, looking at Fig. 4, about the pivot pin or bolt Said driver bar II2 will move upwardly until the lower surface of the flange |23 comes into the plane of or registers with the forwardly and upwardly inclined edges i4 of the side walls of the front cover, as shown in Fig. 2 of the drawing. Thus, when the tanker is struck against the surface S, the driver bar will move from the position shown in Fig. l to the position shown in Fig. 2.

Extending through the apertures or openings ||6 in the extensions |I5 of the driver bar is a .1

horizontal transverse bolt I2| (see Fig. o). As the bar is swung upwardly said bolt |2I will move upwardly within the slots 38 (see Fig. l). The slots 38 are suiiciently wide to provide proper clearance for movement of the bolt |25. Said bolt |2| has a head at one end and a nut at the other end contacting the outer surfaces of wall portions i i5 of the driver bar. Surrounding the shank. of the bolt and passing through the slots 33 is a bushing |22 serving as a spacer to properly space the wall portions I I5.

Extending through the openings 3i in the side walls 3|) of the frame is a horizontal transverse pivot pin |25 (see Fig. 5). Surrounding the pivot pin and disposed between said side walls 38 is a bushing |26 having reduced ends. Pivoted on the reduced ends of the bushing is a driver lever |2'I. Said driver lever |21 comprises a pair of similar symmetrically disposed lever parts |28.

Said parts |28 comprise parallel arms |29 substantially contacting the inner surfaces of the side Walls 3d of the frame. Said arms |23 are formed with openings |30 to receive the reduced portions of the bushing |26. Said arms |26 are formed `adjacent their rear ends with openings ISi to receive therethrough the reduced ends of a bushing |32 surrounding the spacer bushing |22. Extending forwardly from the parallel arms |29 are .inclined portions |33 converging toward each other, and extending forwardly therefrom are arms |34 contacting one another and fixed to each other by a pair of transverse rivets |35.

The arms I3 are each formed with a notch I3? at its underedge disposed above the rivet i8 (see Fig. 2). It will be noted that the arms i3d pass between the walls 96 of unit 9 I and between the rivets 'I8 and 86 and into the box 53| above the bottom wall |03 of the latter, and between the side walls |64 thereof.V Said arms |34 are formed at their forward ends with registering- `8 slots |38 opening forwardly and receiving there-v through the transverse pin |06.

It will now be understood that as the tacker is struck and the driver bar II2 swings in a clockwised direction relative to the frame, lever |21 will be caused to rotate in a counterclockwise direction relative to the frame, thereby causing the plunger to descend for driving a staple.

It will be observed that when the tacker is fully struck, as shown in Fig. 2, the bottom wall II2 of the frame is inclined rearwardly and upwardly to provide sufficient space beneath the handle of the tacker for the fingers of the operator.

Surrounding the bushing |26 is a torsion spring |40 (Fig. 2 and 13) having one end engaging the bushing |32 and another end hoked about a pin |4|, the ends of which are received in the notches 36. The spring tends to rotate the lever |28 in a clockwise direction. After the staple is driven and the tacker is lifted the spring |40 brings all the parts back to their normal position, thereby raising the plunger. The lever will strike the pin 'I8 just before the bottom wall of the box |0| strikes the bottom stop wall S2 of unit 9|. Rivet 86 will be contacted by arms |34 of the lever to limit upward movement of the plunger.

It will now be observed that the pin 18 has three functions. First, it serves to attach the front cover to the frame. Secondly, it serves to x the unit 9| within the frame, and third, it serves as a stop for the lever |28.

The unit 9| also has several functions. It serves as a back stop for the sliding plunger |00. The bottom wall 32 thereof acts as a bottom stop for the plunger. 1t also serves to support the top of the filler channel 50, and it furthermore serves to space the side walls of the frame. It also provides a track or throat for the plunger blade |09.

The top pin 33 has several functions. It serves to attach the top cap or cover to the frame. It aids in supporting the back stop for the plunger and it also acts as a tcp stop for the driver lever.

It will be noted that when the tacker is turned around it can be used as an ordinary hammer and the top wall BI of the cap or cover serves as a hammer surface when hammering. The dove- `tailed tongue 63 serves to lock the front cover with the cap. The bushings |26 and |32 are preflerably of hardened steel to insure long wearing properties.

It will now be observed that a little movement of the driver bar gives fast movement of the plunger through a greater distance, thereby giving the momentum necessary to drive staples. It will be observed that the bottom flange |23 is fiat so that it will not dig into the material or surface vbeing struck. The long fulcrum of the driver bar I2 together withv the short movement of the driver bar at the point where it is struck is desrable because it gives speed to the stapling operation.

It will be noted furthermore, that the bushing serves as an additional hold-down for the ller channel 50.

.not in a hunting sense.

9 I-.Ilavngi thus desoribedfmy inventonl claim. as new anddesire izo-securefhy LetterszEatent;

L.. Ak hammer. typertaoker comprisingfa frame. having a.4 head at one` end; and a handleextension atztheother, a. staple magazine withinv the-frame, a plunger slidablymounted thev head of the: frame,r a driver bar hingedat itsr rear andato therfra'meandhavng. a. front end disposed below the headof the frame and adanted. to contant a. struck., surface for; rotating. said bar about its iuicrumy aleverwithinv thefrainepivoted medial:` thefenols thereof tosaid frames. saidlever han* ing; a rearwardly extend-ing anna pivoted, to an intermediate portion of the driver bar, andsa-id lever: having a forwardlyextending; arm having apinand slot connection with the plunge-r.

2-. A hammer type. tacker -eomprising a. trame having ahead a-t oneendandv a handle extemion atthe other, a staple magazine within the frame, af. plunger slidably mounted. withinthe head of theframe, al driver bar hinged at its rear end to. they frame and having a, frontend disposed below the head; of the frame, and adapted. to contact a strucksurface for rotating` said bar about. its ul'crund,y enlever-within the frame nivo-ted medial.- lyrthe; end-s: thereof-to said frames. said lever having-a rearwardly eXteriding` arm` pivotedi tov arr in.- termediate portion. of. the driver bar; and, said leverhaving a forwardlvextendine arm havinea pim andi slot: connection with the plunger; affront cover on the frame having forwardly and up.- wardly inclined lower edges,- and. said driver. bar

at its. forward end a forwardly and; upwrardly inclined portion adapted. to register.v with saidforwardly and upwardly inclined edges: when the;- devioe: is:4 fully struck: against a suraee;

3;. A hannner type stapler-'comprising a. frame having: a. head atv one. end and. a, handle extension; the other, a. plunger slidably mounted for. up; and; down movement; within; the head of the. trama. a. drnzerbar` pivoted at its; rear' end to am intermediatel portion of the frame. between head: and the.- handle, said driver' barA having at; its, onti end a. oi-'wardly and; .upwardly in.- olinedl bottoms portion normally disposed below the bottom of' theframe, a lever within. the frame pvoted; mediallv the ends:v thereof to. said frame and havingV a rearwardly extending'. arm pivotally connected: to an intermediate portion.- of thedriv'- er bar.'- between the. frontI end. and the pivotedi end ofsaid driver bar, andA said lever having a torwardly'extending arm having a pin and slotsom.- ne'ction with: the plunger.

4?. A hammer type stapler comprising a frame having ay bottom wall and'A upwardly extending sidewalls, said side. walls being' narrow at' their rear endstol provide a handle and' increasingr in height toward their front. ends to form a` head",y a front cover. fitted over the frontend. of.' thefrarne and having a front wall contacting; the front edges, of the; side walls; of the frames and; said front cover having side'. walls oontactingtheo-uter surfaces of the side wal-lsv of the. frame., said sido walls oi the frame and; liront; cover. having; resi- Lstering openings. a; transverse loin passing through said. registering openings,V and al disposed between. the side. walls; oli the frame and having a. horizontal bottom wall and parallel vertical side; walls,y said sidewalls-.of said unit-oontactine. theirin'er surfaces; of' the side walls: of the frame, and being fomnied;` with openings through which saidv transverseein passes; and a plungerslidably mounted between the side walls .on theirame and located between the .frontwall Sfr Qtthe front. cover andthe front. @dees of thesimwalls of-said' 5... The combination.. of claim. 4 said plunger having; a bottom, wall, located. over the, said' bot,- tomwall. o said unit and adapted to. strike the bottom Wall of, said. unit., when) said plunger' de sccnds 6,. 'Ilhe combination... of. claim. 5, the bottom wall o saidunitibeing termed inthe front end with a groove; andT saidlrzlimser comprising.. a plunger blade, received within. said groove..

'L 'the Combination, Qi claim. 4. in combination withastanle. magazine. fixed.. within the bottom ot said.. traine between, theT bottom. wall of. Sad frame and they side. wallsy of. said frame.,. and; the bottomwallof saidunit contactnatho ton of' said stan-lemagazind 8... Thecombnationof claim 4 in combination with a` spring. actuated. lever pivotedT to. the. fratrieV and commentedy toQsaidl plunger,v and a driver; bjar riveted, to; the ,trame and lever and having4 a portion. projecting below. the. front. end, ofA saidframe.-

9,. Ahammel; type stapler. comprising. a, frame having, a. bottom walt and upwardly extending sid-'e walls. said. side walls being narrow at4 their rear ends to. provide. a. handle andincreasing, in height toward their front ends to form., ahead', a; iront cover fitted oyer the front. end. of the frame.- and having airont. wal-l contacting the frontedges, o i` the side walls of theY frame, and said. trent.. cover having sidewalls contacting the outersurfacesor the side. walls. of` the. frame, said side wal-ls ot the: frame. and front cover, having registering, open-ings a transverse pin; passing through said registering openings, and a. unit disposed between theside wallsof the frame, and having ahorizontal'lbottomwall and parallelvertical side. walls.. saidside. walls. of said unit contasting;A thei-hner surfaces or the sidewalls, oi the frameV and being termed with openings through which. said transverse. hin. passes.,` and a plunger slidably mounted between. the side Walls oi the frame and located; between. the front wall. of the front cover and theiront edgesof the side walls of. Said. said, plunger comprising; a member sayingv a. from. van and. side. walls. extending rearwardly therefrom. and a bottoni wallextend.- ing., rearwardly from. the lower end of said front of said memben and e plunger blade. xed to, the.. front surfaoe of the front.. wall of said member and extending; downwardly therefrom a pin interconnecting, the sidewalls. of` said mem.- ben a driver har pivoted at its` rear.; endv to the frame,- substantal1vy midway between the fron-t and. rear ende of. the latter, and; extending for Wardly thereinem, said driver bar havinga trent and disposed below.' the bottom oi the; frame, av lever,7 nivotedl medi-ally the: ends; thereof to; the and. having; a, termi-rdiyv projfs-acting` arm f orxnedgwith. a. slot engaging the transverse? Din on said. member;L and. said lever having' a rea-rwardlventendi-na armi pivoted to the driver bar soiestantially.Y midway 'between the front; and; rear endsiof'thal-'atten me. A hammer tyle stapler comprising aframe having a. bottom wall and' upwardly extending side ,wallsg` side wallsbei-ng narrow' at their' reali endsttoi provide a handle and increasing` ih height: toward their ront' endsto form a head, a :E1-:oraficover ntl-,ed over the front endof theframe and having.la iront wal-l contacting the front edges or the side walls 'of the iframe, and said iront., coverehavnig sidewalls contacting: theouter walls: o? the trarne and, front cover having` regi.4

istering openings, a, transverse pin passing through said registering openings, and a unlt disposed between the side walls of the frame and having a horizontal bottom wall and parallel vertical side walls, said side walls of said unit contacting the inner surfaces of the side walls of the frame, and being formed with openings through which said transverse pin passes, and a plunger slidably mounted between the side walls of the frame and located between the front wall of the front cover and the front edges of the side walls of said unit, said plunger comprising a member having a front wall and side walls extending rearwardly therefrom, and a bottom wall extending rearwardly from the lower end of said front wall of said member, and a plunger blade fixed to the front surface of the front wall of said member and extending downwardly therefrom, a pin interconnecting the side walls of said member, a driver bar pivoted at its rear end to the frame substantially midway between the front and rear ends of the latter, and extending forwardly therefrom, said driver bar having a front end disposed below the bottom of the frame, a lever pivoted medially the ends thereof to the frame and having a forwardly projecting arm formed with a slot engaging the transverse pin on said member, and said lever having a rearwardly extending arm pivoted to the driver bar substantially midway between the front and rear ends of the latter, a ller channel fixed within said frame and between the side walls of the frame and having a top wall and downwardly extending side walls, the side walls of the filler channel contacting the inner surfaces of the side walls of the frame, and the bottom wall of said unit contacting the top wall of said ller channel,

' 1l. A hammer type stapler comprising a frame having a bottom wall and upwardly extending side walls, said side walls being narrow at their rear ends to provide a handle and increasing in height toward their front ends to form a head, a front cover fitted over the front end of the frame and having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer surfaces of the side walls of the frame, said side walls of the frame and front cover having registering openings, a transverse pin passing through said registering openings, and a unit disposed between the side walls of the frame and having a horizontal bottom wall and parallel vertical side walls, said side walls of said unit contacting the inner surfaces of the side walls of the frame, and being formed with openings through which said transverse pin passes, and a plunger slidably mounted between the side walls of the frame and located between the front wall of the front cover and the front'edges of the side walls of said unit, said plunger comprising a member having a front wall and side walls extending rearwardly therefrom, and a bottom wall lextending rearwardly from the lower end of said front wall of said member, and a plunger blade fixed to the front surface of the front wall of said member and extending downwardly therefrom, a pin interconnecting the side walls of said member, a driver bar pivoted at its rear end to the frame substantially midway between the front and rear ends of the latter, and extending forwardly therefrom, said driver bar having a front end disposed below the bottom of the frame, a lever pivoted medially the ends thereof to the frame and having a forwardly projecting arm formed with a slot engaging the transverse Pin.

on said member, and said lever having a rearwardly extending arm pivoted to the driver bar substantially midway between the front and rear ends of the latter, a filler channel fixed within said frame and between the side walls of the frame and having a top wall and downwardly extending side walls, the side walls of the ller channel contacting the inner surfaces of the side walls of the frame, and the bottom wall of said unit contacting the top wall of said filler channel, the pivot between the driver bar and the frame comprising a transverse pin, and a bushing thereon contacting the top wall of said ller channel.

12. A hammer type stapler comprising a frame having a bottom wall and upwardly extending side walls, said side walls being narrow at their rear ends to provide a handle and increasing in height toward their front ends to form a head, a front cover fitted over the front end of the frame and having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer surfaces of the side walls of the frame, said side walls of the frame and front cover having registering openings, a transverse pin passing through said registering openings, and a unit disposed between the side walls of the frame and having a horizontal bottom wall and parallel vertical side walls, said side walls of said unit contacting the inner surfaces of the side walls of the frame, and being formed with openings through which said transverse pin passes, and a plunger slidably mounted between the side walls of the frame and located between the front wall of the front cover and the front edges of the side walls of said unit, said plunger comprising a member having a front wall and side walls extending rearwardly therefrom, and a bottom wall extending rearwardly from the lower end of said front wall of said member, and a plunger blade fixed to the front surface of the front wall of said member and extending downwardly therefrom, a pin interconnecting the side walls of said member, a driver 'bar pivoted at its rear end to the frame substantially midway between the front and rear ends of the latter, and extending forwardly therefrom, said driver bar having a front `end disposed below the bottom of the frame, a lever` pivoted medially the ends thereof to the frame and having a, forwardly projecting arm formed with a slot engaging the transverse pin on said member, and said lever having a rearwardly extending arm pivoted to the driver bar substantially midway between the front and rear ends of the latter, a filler channel xed within said frame and between the side walls of the frame and having a top wall and downwardly extending side walls, the side walls of the ller channel contacting the inner surfaces ofthe side walls of the frame, and the bottom wall of said unit `contacting the top wall of said filler channel, the top wall of the ller channel and the bottom wall of said unit being formed with registering grooves through which the plunger blade may pass.

13. A hammer type stapler1 comprising a frame having a bottom wall and upwardly extending side walls, said side walls being narrow at their rear ends to provide a handle and increasing in height toward their front ends to form a head, a front cover fitted over the front end of the frame and having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer surfaces kof, the Side walls of the frame. said sidewalls ci the :frame Aand front cover V:hrw-ine register-ing openings, fa transverse ein passing ,through said-registering openings, and e, unit diseposed between .the rside walls of the frame and having La horizontal 'bottom Awall -and parallel vertical side walls, Asaid side walls .-of said unit :con- :tactifng the inner :surfaces of theside walls .vof 4the :fname and :being vformed with openings through Y which :said transverse pin passes, and ,a plunger :slidably mounted between the side walls -of -the frame and located between the ,front -wall of the iront cover and the front 'edges 'of the side Walls tof. said nnit, :said plunger comprising a .member hav-ing va :front 'wall and side walls vextending' rearwardly therefrom, and .a .bottom wall extending rejarvvardly from the Alower :end of said irontwa'll of said member, and e, plunger blade fixed to the front :sur-face of the -front wall of said member and extending downwardly therefrom, a E19in interconnecting the side walls of said member, a driver bar 'pi-voted at its rear fend .to :the -trarne substantially midway `between the-front and rear endsfof the latter, i,and extending -forwardlytherevffrom, -said drive-r bar having a front end .disposed rbelow ,the bottom @of ythe iran-ie, va -lever pivoted medially fthe ends thereof -to the frame and lhaving a -forwardly projecting arm Vformed with a slot engaging the transverse -pi-n ron said member, and said lever having fa rearwardly -extending arm pivoted to the dr-iver bar substan- -tially midway between the front and rear ends of the latter, and the -side walls ofthe frame being ionmed with slots through which Vpass the pivotal Aconnection between the rearwardly :extending arm of said lever and saiclfdriver bar.

i154 aoperiings, and a :transverse pin Y:passing through saidfopenings topx theironte-oover ttothe frame, and :a unit `within the iframe having fa bottom .wail and fupwardly extending side walls7 the ',-side walls -of said unit :contacting :the 'inner v-si-irfaces Koi the `side -walls r`oi fthe :frame fand .having open- .ings through which 4said transverse pin ipasses, and anlungaerrslidablyL-mounted within said :frame and .between :thefsi'de vwal-ls of .the-frame and Lh-av- :inga portion contacting the front `edges of the `sidewalls of said unitand disposed abovethe fbot- 1 4. A hammer type staplercomprisijng a frame i having -a ,bottom wall and upwardly extending side walls, and having front-edges, a front cover having g, iront wall contacting ythe iront edges .of the side walls .-of the drame, @and said ff-ront cov-er having Iside -w-a-lls lcontacting vthe outer :sur- -faces ci" the :side walls -o said frame, the side `wal-ls of said frame and iront cover having registering openings., and a transverse pin passing through said openings tto the iront Acover -to .the iframe, and ,a unit within the :fram-e :having .a bottom .wall :and upwardly 4-eictending side walls, the side walls of said `unit contacting 4the inner surfaeesoif -tl-ieside walls'of the irameland having open-ings .through :which said transverse pin passes, a staple magazine on' the bottom wall .of .the frame and between its side walls, .and the bottom wall :of said .unit contacting the top of ,said magaziney 1-5. The .combination ,of claim le, in combination ,with -a plunger sli-dable the irai-ne and .between the Airont .edges .of the .side walls of said mit and the `front wall of the `cover, and a, portion of said plunger overlying the bottom wall ,of said unit and a lever pivoted mediately the ends thereof, to said frame, the :front end .of said lever .being connected `to .said plunger and an operating .bar pivoted at its .rear end Sto the traine and at an intermediate portion thereof vto the rear .erid of the lever .and .said actuating bar havtem wallf of said .717.. ,A hammer type-@stapler comprising afirame .having 7.a bottom ywall and '-upwardly extending sidewalls, :and having. front aedges, a front-cover .having afronta wall contacting `the front edges of the sidewal-lsfof .fthe iframe,:and sai-d front cover having side walls contacting the outer surfaces 'of the -side walls `of -said drame, vthe side walls of said -frame and iront cover `having registering opening-s, and a transverse pin passing through said :openings -to rthe front cover to the ,frame .anda unit withinrtheframehaving 5a bottom wall l,and upwardly .extending side walls,.the side walls yof `said unit `ycontacting thefinner surfaces -of :the

side walls of the tra-me and .having openings through vwhich said transverse rpin passes., and aV plunger Aslichibly .mounted fwithin :sa-id frame `and between the side Vwallsof the :ir-ame and having `a por-tion contacting the -front edges iof the .side ywalls lof said unit and disposed above 'the bottom .wall of said uni-t, `said bottom wall having .a .groove at its front endend-said `plunger-inchidi-ng a plunger blade passing `through said groove,

.18. -A lhammer type stapler 'comprising aframe having a bottom wall and upwardly extending side walls, and having front edges, afron-t cover having a front wall 'contacting the front edges .of-'the side walls *of the fir-ame, .and said front cover .having ,side walls contacting the outer .su-r- `faces of 1.the `side walls of .said frame, the side walls 'of .said frame :and -front cover having registering openings, and va transverse pi-n passing .through vsaid openings to nx the vfront cover to .the frame, and a, unit within the frame having a Ibott-om wall :and vupwardly extend-ing side walls, the side walls of :said unit contacting the inner surfaces lof the side walls of the `frame and having .openings through which said 'transverse pin passes, and 'a `pli-.Inger :sli-dably mounted within ,said frame and between the vside walls of the .frame and having a portion contacting the iront edges of the side walls of said unit and disposed above the ,bottom wall 'of `said unit, a .lever pivoted media-ily the `ends thereof to said frame and having a. ,forwardly extending arm having a pin and :slot connection with said plunger, and said lever having a rearwardly extending arm, a driver bar pivoted at its rear end to the frame rearwardly of said lever, said driver bar having a iront end normally disposed below said frame, and e, pivot `pin interconnecting the rearwardly extend-ing 4arm of .said lever with an intermediate portion of said driver bar, 'and the iside walls of said frame having slots thro-ugh which said last ing a portion at its iron-t end normally disposed sid-e walls, and having front edges, a front cover Ahaving a front wall contacting the front edges -of; the side walls .of the frame, and said .front @over having-.side Walls contacting the .outer sur- `vfentes ofthe side walls of said frame, the 'side walls @Lf said frame' andfront cover having registering,

mentioned pivot pin passes.

19. A hammerr type stapler vcomprising a frame having a bottom wall and upwardly extending side walls, and having iron-t edges, a front 'cover having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer surfaces of the sides walls of said. frame, the Vside walls of said frame and front cover having .registering openingsand a transverse pin passing through said openings to nx the front cover to the frame, and a unit within the frame having a bottom wall and upwardly extending side walls, the side walls of said unit contacting the inner surfaces of the side walls of the frame and having Openings through which said transverse pin passes, and a plunger slidably mounted within said frame and between the side walls of the frame and having a portion contacting the front edges of the side walls of said unit and disposed above the bottom wall of said unit, a lever pivoted medially the ends thereof to said frame and having a forwardly exending arm having a pin and slot connection with said plunger, and said lever having a rearwardly extending arm, a driver bar pivoted at its rear end to the frame rearwardly of said lever, said driver bar having a front end normally disposed below said frame, and a pivot pin interconnecting the rearwardly'extending arm of said lever with an intermediate portion of said driver bar, and the side walls of said frame having slots through which said last mentioned pivot pin passes, the first mentioned transverse pin being so located as to engage the underedge of the forwardly extending arm of said lever to limit downward movement of the plunger.

20. A hammer type stapler comprising a frame having a bottom wall and upwardly extending side walls, and having front edges, a front cover having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer surfaces of the side walls of said frame, the side walls of said frame and front cover having registering openings, and a transverse pin passing through said openings to fix the front cover to the frame, and a unit within the frame having a bottom wall and upwardl;7 extending side walls, lthe side walls of said unit contacting the inner surfaces of the side walls of the frame and having openf ings through which said transverse pin passes, and a plunger slidably mounted within said frame and between the side walls of the frame and having a portion contacting the front edges of the side walls of said unit and disposed above the bottom wall of said unit, a lever pivoted medially the ends thereof to said frame and having a forwardly extending arm having a pin and slot connection with said plunger, and said lever having a rearwardly extending arm, a driver bar pivoted at its rear end to the frame rearwardly of said lever, said driver bar having a front end normally disposed below said frame, and a pivot pin interconnecting the rearwardly extending arm of said lever with an intermediate portion of said driver bar, and the side walls of said frame having slots through which said last mentioned pivot pin passes, the rst mentioned transverse pin being so located as to engage the underedge of the forwardly extending arm of said lever to limit downward movement of the plunger, the side walls of said frame being interconnected by a top transverse pin passing through openings in the side walls of said unit, and said top pin serving to contact the top of the forwardly extending arm of said lever to serve as a stop for the upward movement of said plunger.

21. A hammer type stapler comprising a frame having a bottom wall and upwardly extending side walls, and having front edges, a front cover having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer surfaces of the side walls of said frame, the side walls of said frame and front cover having registering openings, and a transverse pin passing through said openings to x the front cover to the frame, and a unit within the frame having a bottom wall and upwardly extending side walls, the side walls of said unit contacting the inner surfaces of the side walls of the frame and having openings through which said transverse pin passes, and a plunger slidably mounted within said frame and between the side walls of the frame and having a portion contacting the front edges of the side walls of said unit and disposed above the bottom wall of said unit, a lever pivoted medially the ends thereof to said frame and having a forwardly extending arm having a pin and slot connection with said plunger, and said lever having a rearwardly extending arm, a driver bar pivoted at its rear end to the frame rearwardly of said lever, said driver bar having a front end normally disposed below said frame, and a pivot pin interconnecting the rearwardly extending arm of said lever with an intermediate portion of said driver bar, and the side walls of said frame having slots through which said last mentioned pivot pin passes, the first mentioned transverse pin being so located as to engage the underedge of the forwardly extending arm of said lever to limit downward movement of the plunger, the side walls of said frame being interconnected by a top transverse pin passing through openings in the side walls of said unit, and said top pin serving to contact the top of the forwardly extending arm of said lever to serve as a stop for the upward movement of said plunger, and a top cap on the top of the forward end of said frame and having a top wall contacting the upper edges of the side walls of said unit and said top cap having side flanges formed with openings through which the top pin passes.

22. A hammer type stapler comprising a frame having a bottom wall and upwardly extending side walls, and having front edges, a front cover having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer surfaces of the side Walls of said frame, the side walls of said frame and front cover having registering openings, and a transverse pin passing through said openings to x the front cover to the frame, and a unit within the frame having a bottom wall and upwardly extending side walls, the side walls of said unit contacting the inner surfaces of the vside walls of the frame and having openings through which said transverse pin passes, and a plunger slidably mounted within said frame and between the side walls of the frame and having a portion contacting the front edges of the side walls of said unit and disposed above the bottom wall of said unit, a lever pivoted medially the ends thereof to said frame and having a forwardly extending arm having a pin and slot connection with said plunger, and said lever having a rearwardly extending arm, a driver bar pivoted at its rear end to the frame rearwardly of said lever, said driver bar having a front end normally disposed below said frame, and a pivot pin interconnecting the rearwardly extending arm of said lever with an intermediate portion of said driver bar, and the side walls of said frame having slots through which said last mentioned pivot pin passes, the first mentioned transverse pin being so located as to engage the underedge of the forwardly extending arm of said lever to limit downward movement of the plunger, the side walls of said frame being interconnected by a top transverse pin passing through openings in the side wallsof said unit, and said top pin serv-- ing to contact the top of the forwardly extending arm of said lever to-serve as a Vstop for the upward movement of said plunger, and a top cap on the top ofthe forward end of said frame and having a top wall contacting the upper edgesV of the side walls of `said unit and -said top cap having side iianges formed with openings through which the top pin passes, said top cap having a front wall having a dovetailed joint with lthe front wall of said front cover.

23. A hammer type stapler comprising a frame having a bottom wall and upwardly extending side walls, and having front edges, a front cover having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer surfaces of the side walls of said frame, the side walls of said frame and front cover having registering openings, and a transverse pin passing through said openings to iix the front cover to the frame, and a unit within the frame having a bottom wall and upwardly extending side walls, the side walls of said unit contacting the inner surfaces of the side walls of the frame and having openings through which said transverse pin passes, and a plunger slidably mounted within said frame and between the side walls of the frame and having a portion contacting the front edges of the side walls of said unit and disposed above the bottom wall of said unit, a lever pivoted medially the ends thereof to said frame and having a forwardly extending arm having a pin and slot connection with said plunger, and said lever having a rearwardly extending arm, a driver extending arm of said lever with an intermediate portion of said driver bar, and the side walls of said frame having slots through which said last mentioned'pivot pin passes, the first mentioned transverse pin being so located as to engage the'underedge of the forwardly extending arm of said lever to limit downward movement of the plunger, the side walls of said frame being-interconnected by a top transverse pin passing through openings in the side walls of said unit, and said top pin serving to contact the top of the forwardly extending arm of said lever to serve as a stop for the upward movement of said plunger, and a top cap on the top of the forward end of said frame and having a top wall contacting the upper edges of the side walls of said unit and said top cap having side flanges formed with openings through which the top pin passes, said top cap having a front wall having a dovetail'ed joint with the front wall of said front cover, said side walls or" the frame having outwardly projecting extruded portions received in notches in the upper edges of the side walls of the front cover.

24. A hammer type stapler comprising a frame having a bottom wall and upwardly extending side walls, and having front edges, a front cover having a front wall contacting the front edges or the side walls of the frame, and said front cover having side walls contacting the outer surfaces of the side walls of said frame, the side walls of said frame and front cover having registering openings, and altransverse pin passing through said openings to ix the front cover to the frame, and a unit within the frame having a bottom wall and upwardly extending side walls,

the side 4walls of said unit contacting the inner surfaces of theside walls of the frame and having openings through which said transverse pin side walls, and having front edges, a front coverl having a front wall contacting the front edges of the side wallsof the frame, and said front cover having side walls contacting the outer surfaces ofthe side walls of lsaid frame, the side walls of said frame and front cover having registering openings, and a transverse pin passing through said openings to fix the front cover to the frame, and a unit within the frame having a bottom wall and upwardly extending side walls, the side walls of said unit contacting the inner surfaces of the side walls of the frame and having openings through which said transverse pin passes, and a plunger slidably mounted within said frame and between the side walls of the frame and having a portion contacting the front edges of the side wells of said unit and disposed `above the bottom wall of said unit, -said bottom wall having a groove at its front end and said plunger including-a plunger blade passing through said groove, the side walls of said frame having slots and the bottom wall of said unit having horizontal wings received in said slots, and a ller channel in the bottom of said frame running lengthwise thereof and having a top wall parallel to the bottom wallv of the frame, and side walls contacting the inner surfaces of the side walls of said frame, and the bottom wall of said unit contacting the top surfaces of the top wall of said ller channel.

26. A hammer type stapler comprising a frame provided with a rearwardly extending handle, a plunger slidable up and down, at the front of the frame, a lever pivoted mediately the ends thereof to said frame, the said lever having an operating connection at its front end, to the plunger, a driver bar pivoted at its near end to said frame, rearwardly of the lever, means to pivotally connect an intermediate portion of the operating bar to the rear end of the lever, said driver bar having a front end projecting below the front end of the frame.

27. The combination of claim 26, in combination with spring means to rotate the lever in a direction for raising the front end of the lever to lift said plunger.

28. The combination of claim 26, said front end of said driver bar being inclined upwardly and forwardly relative to the plane of the underside of the frame.

29. The combination of claim 28, in combinaion with spring means to rotate the lever in a direction to raise the front end of the lever to lift the plunger.

3G. A hammer type stapler comprising a frame, a plunger slidably mounted within the frame at the front end of the latter, a plunger blade fixed to said plunger and extending downwardly therefrom, said plunger having side walls, a pin interconnecting said side walls of said plunger, a

19 driver bar pivoted at its rear end to the frame substantially mid-way between the frontl and rear ends of the frame, said driver bar having a front end disposed below the bottom of the front end of the frame, a lever pivoted medially the ends thereof to the frame and having a forwardly projecting arm formed with a slot engaging a transverse pin on said plunger, and said lever having a rearwardly extending arm pivoted to the driver bar substantially mid-waybei tween the front and rear ends of said bar.

3l. A hammer type stapler comprising a frame having a bottom wall and upwardly extending side walls, said side walls being narrow at their rear ends to provide a handle and increasing in height toward their front ends to form a head, a front cover fitted over the front end of the fra` me and having a front wall contacting the front edges of the side walls of the frame, and said front cover having side walls contacting the outer i surfaces of the side walls of the frame, said side wells of the frame and front cover having registering openings, a transverse pin passing through said registering openings, and a unit disposed between the side walls of the frame and having a horizontal bottom wall and parallel vertical side walls, said side walls of said unit contacting the inner surfaces of the side walls of the frame, and being formed with openings through which said transverse pin passes, a plunger slidably mounted between the side walls of the frame and located between the front wall of the front cover and the front edges of the side walls of said unit, said plunger comprising a member having a front wall and side walls extending rearwardly therefrom, and a bottom wall extending rearwardly from the lower end of the front wall of said member, andthe plunger blade fixed to the front surface of the plunger wall of said member extending downwardly therefrom, means to reciprocate said plunger up and down, a ller channel xed within said frame and between the sidewalls of the frame and having a top wall and downwardly extending side walls, the side walls of the ller channel contacting the inner surface of the side wall of the frame, and the bottom wall of said unit contacting the top wall of said filler channel.

32. The combination of claim 3l, the top wall of the ller channel and the bottom wall of said unit being formed with registering grooves through which the plunger blade passes.

33. A hammer type stapler comprising a frame, provided with side walls, a unit within the frame having a bottom wall and upwardly extending side walls contacting the inner surfaces of the side walls of the frame, means to attach said unit to said frame, a plunger slidably mounted within the frame and slidably engaging the front edges of the side walls of the unit, a lever pivotedme dially to the ends thereof, to said frame, and having a forwardly extending armv operatively connected with said plunger, said lever having a rearwardly extending arm, a driver bar pivoted at its rear end to the frame rearwardly of the lever, said driver bar having a front end normally disposed below the front end of said frame, and means to interpivot the rearwardly extending arm of said lever in the intermediate portion of said ldriver bar.

34. A hammer type stapler comprising a frame provided with side walls, a plunger slidable up and down between said side walls at the front end of the frame, a pivoted pin interconnecting said side walls, a lever disposed between the side walls of the frame, said pivot pin passing through said lever, the front end of the lever being connected by a pin and slot connection to said plunger, a driver bar having side walls disposed at the outer sides at the side walls of the frame, means to pivot the rear ends of the side walls o the driver bar, the rear end of the lever being pivotally connected to medial portions of the side walls of said bar by means of the pivot pin passing through slots formed in the side walls'of the frame.

35. The combination of claim 34, the side walls of the driver bar being formed at their front ends with portions inclined upwardly and forwardly relative to the underside of said frame.

36. The combination of claim 34, the front ends of the side walls of said bar and the portion interconnecting the side walls of said bar being provided with flanges disposed in a plane inclined upwardly and forwardly relatively to the under side of said frame.

MORRIS ABRAMS.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 2,087,242 Bunnell July 20, 1937 2,264,322 Maynard Dec. 2, 1941 2,267,719 Crosby Dec. 3G, 1941 2,463,507 Braclay Mar. 8, 1949 2,463,579 Vail Mar. 8, 1949 2,466,856 Makin Apr. 12, 1949