CA1194651A - Fastener tool - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A fastener tool having a housing in which is mounted a universal motor to be continuously operated during operation of the tool. A gear driven by the motor is a rotary driven member. A drive pin is carried by the gear to rotate therewith and is free to be shifted axially relative the gear. A drive bar is mounted in the housing to drive fasteners. The drive pin is connectable to the drive bar to produce a power stroke and a return stroke.
An interrupt mechanism is operative to prevent successive power strokes, and in the preferred embodiment it will include the drive pin; it will act to disconnect the drive pin from the drive bar. Also the interrupt mechanism will control the connection of the drive pin and drive bar.
The maximum number of power strokes are one-half the number of rotary cycles of the rotary driven member. The interrupt mechanism includes a linkage for sensing workpiece engagement and operator actuation of the tool, each of which are required to produce a single power stroke.
The interrupt mechanism may also include a track and shifter to axially shift the drive pin. The drive bar has a slot which in a start position is aligned to receive or release the pin during a predetermined 45° arc of gear rotation.
A detent will yieldly hold the drive bar in the start position.

Description

~his is a divisional of Canadian Putent A~plication Serial N~. 398,963, filed March 22, 1982.

BACKG~OU~D OF I~E l~VENIl~N

1A Fiela cf the Invention A fa~tener tool such a6 a tapler, nailer or the like has a sontinuously ~unnin~ motor and a driven me~,ber such ~s ~ geas coupleable ~o a reciprocal drive bar in a pc~er stroke for driving f~stener at a maxi~um rate of not ~.Gre than once ~or every two rotary cycles of the gearO ~'hen fA~tening i~ no~ desired the motor will rem2in on but she drive bar will not psrtake of A po~er 6troke. In the preferred embodiment a drive pin is included in ana controlled via ~n interrupt mean~ ~electively to couple and uncouple the drive bar snd the dri~en me~.b~r. Ihe drive bar partahes of a power s~roke and ~ return stro~e, and will be posi~ively driven to cycle fro~ a start position in ~hich it receives or relea6es the pin durir.~ a predetermined ~well sngleO
The interrupt mechsni~m also includes a track and shifter ~oveable to eontrol the drive pin responsive to ~n ar~ing link~ge whi~h ~ens~s ~he exi~tence o$ 6y6te~, pass~eters such 8s workpiece engagement and operator actuation of ~he tool.

20 Description of the Prior Art Fa~tening tool~ of the prior ~rt u6ed various pvwer ~5 ~ource6 6uch ~s ~lectric OT pneumatic motors, compression 6prings and the like, to po~er a r~m or other impact ~e~ber in a positive manner, but ~uch device~ had a drive or r~urn s~roke ~hich relied Dn the stored rnergy in: (l) 2he sy~tem; (2) the impact member; or ~3) ~ dri~e or re~urn ~prin~. Pair~ o~ 1y~heels, mOtDr driYen, were ~160 ~sed ~s ~ power ~ource to drive ~ ram~ bu~ ~fi noted rb~ S ~

~bove thou~h the driYe ~az po6itive, the return was not.
Some p~ior art fa~tener tool6 ~ere powered by ~ solenoid.
In any event, all prior art fastener tool~ wer~ believed to have one os ~ore di6adv2ntage6 a6 ~ollows: co~plex;
heavy; ~asd to control; un6table; and/or expensive.
Another fea~ure found in the prior art i6 in the nature of a direct drive wherein the ~otor i~ ~echanicall~
coupled directly to the i~p~ct ~e~ber ~o thaL power 6trokes are on a one-to-one basis with the cycles o~
operstion of the ~otor. Accordingly, the fastener tool'~
~otor had ao h~ve 6ufficient energy to drive the fazteners.
E~ample~ of various prior ~rt patents ~ay be fo~nd as follo~s: MDtOS powered - U.5. Patent~ NosO 1,~23,644;
1,b45,617 (re~ote ~otor); Solenoid pcwered - ~.5. Patent No. 3,16~,55~; Pair of flywheels - ~otor powered - ~.5.
Patents Nos. 4,2~4,622; 4,121,745; 4,042,036.

S~M~IARY OF IH~ INVE~IIO~

A ~a6tener tool hsving 8 continuous runnin~ motor to drive a rotary trans~i~ion and a reciprocal driving bar is coupl~c through an interrupt mecheni6m to produce up to one power ~troke for each two cycle6 o~ r~vol~tion o~ the trsns~i~sion. ln the preferred embodiment the interrupt ~ech~nism include~ a drive pin ~hich mechanically connects the tran~mission snd the drive ~ar to poaitively drive the bas in a po~er xtroke and a ~eturn ~troke. Ihe interrupt ~ech~ al~o iocludes a track, a shifter ~nd ~r~ing linksge w~ich co-ic~ to control the dsive pin an the couplin~ Ænd un~oupling of the drive bar.
It i~ ~n object of the present inveation to proviGe ar, i~prov~d f~tener tool ~hich overcomes the prior 3rt di~adv~nt~ea; ~hich i~ ii~ple, economical ~nd reli~ble;
which i~ light ~ight, s~ller in 6ize ~nd ~table to 6~L

oper~te; ~hich h~6 ~ drive bar ~echanic~ reciproc~ted through ~ power ~troke ~nd a r~turn 6tsDke; ~hich has coneinuously running rotary power ~ousce; ~hich power ~ource i6 ~ continuou61y running univer~al ~otor; whick u~es an i~proved interrupt ~ech~ni~m to pTevent 6uccessive power ~troke~; which u~ec an interrupt mechani~.
~electively to coupl~ and uncouple the drive bar ~nd a rotary power source to produce one power 6tIoke, sno to prevent ~ucce~sive power stroke~; which in~errup~
mechani6m incl~de~ ~ ~hiftsble drive pin to couple snd ~o uncouple the drive b~r and rot~ry power ~ouTce; which interrupt mechani~ inter cnnects the drive bar ~nd the rotary power 60urce to produce ~ ~9xi~ nu~,ber of the power ~troke~ ~t a rate of one-h~lf th~ number of cycles l~ of rotation oi the rotary driven mnmber; ~hich interrup~
mech~nism inclu~e~ ~ drive pin, a ~r~ck, a lever, ~
~hifter ~nd arming link~ge to produce ~ power 6troXe ana prevent 6ucce6~ive power ~troke~.
Another object of the pre6ent invention i6 to provide 20 ~n improved f~tener tool which ha~ an interrupt ~echanism which cycle~ ~he power stroke~ st a le~ser r~te than ~he cycle~ of ~he rotation of the rotary driven member ~nd pre~ents succe~4ive power ~roke~ rel~ive theretc;
which u6ec ~ drive pin c~rried by ~ gear connect~ble with ~nd ~ele~able ~ro~ the drive bss during ~ predeter~.ined ~rc oi rot~tion o the ~e~r; which u~es a du~l ~urf~ce trDck upon whic~ æ ~ollower o~ the drive pin will ride;
~hich u6e~ ~ 6hifter 6electively to po~ition the follower on ~ front of the ts~ck or a se~r of the track; ~nd ~hich 6hi~tes i~ operative re~pon~iYe ~o ~yctem p~r~eter~, cuch a~ engs~e~ent of ~he workpiece ~d oper~t~r aot~ation of ~he tool~
Other object6 ~nd ~dvDnt~e~ of t~e pre6ent invention ~ill be æpparent fro~ ~he de6crip~ion o~ tbe follo~in~

illustr~tive embodi~ent. The noYel fe~ture~ of the invention are pvi~ted out in the clsim~.

BRI~F DESCRlPTION OF THE DRA~INGS

The invention i8 illus~r~ted in the 2cco~panying drawing~ in ~hich:

FIGURE 1 i6 a ~ide ele~tional view of th2 i~proved fa~tener tool of the pre~ent invention, with the fron~
thereof f~cing rightwa~dly.

FIGURE 2 i6 a ~ectional side ele~ation~l view of the improv~d f~tener tool, witb tbe front ~heseof facing left~ardly.

FIGURE 3 i~ an e~ploded perspectiYe view of the improved f~stener to~1, ~itbout ehe h ~6iog, ~nd ~h~wing ~ome ~ain co~ponents 4uch ~s the rotary power source, $he drive bar ~nd ~he ine~rrupt mechanis~ including the drive pin, the track, the shifter, the lever ~nd ~he arming linkage.

FIGVRES 4~ thrvugh 4d ~bo~ the drive bar and the drive pin in ~ari~l~ po~ition~ ~el~tive to the cycle of ro~ation 20 of ehe ge~r, ~nd ~he r~pec~iYe Rngle of tbe drive pin, ~ore speci~ic~lly: FIGURE 4a ~how~ the in~er~i~n ~nd retract;on of the drive pin during a prede~er~ined d~211 ~ngle; FIGURE 4b ~ho~ ~he ps~er stroke; FIGURE 4c ehows ~he drive bar 8t the end of the i~pDet with ~ f~stener;
~nd FIGURE 4d ~ho~ tbe r~turn ~roke.

FIGURE 5 a~ ~n enlarged ~e ti~nal ele~tional view of ~be drive pa~ ~nd i~egral follo~er c~rried by the gear 5~

a~d ~xi~lly shiftable therein with the ~Dlid line sho~ing the pin in6erted wi~hin the slot of the drave b~s, ~nd the iollower on the front of the oual surface ~r~ck; snd th~
dotted line represent3tioD sho~ing ~he follo~er on ehe re~r of the trask and the pin re~racted fYo~. the ~lot-of the drive bar~

~ l~URE 6 i6 ~ iTont elev~tional YiPw p~rtly in 6ection ~nd pastly broken away ~howin~ the interrupt ~e hanism ir.cluding the drive pin follower on the re~r of the ~rack, with the drive pin 6hown at loc~tions l'a" (601id), and zt location~ "b" ~dotted~ ~nd "c" (do~ted), re~pectively, FlGUR~S 6B, 6b ~nd 6c sre each 6ectional vi~s tcken 310n~ e~ "a-~", "b-b" and "c-c", re~pectively, o~
FIGURE 6 corsebpon~ing to the noted loc~tion~ "a", "b" and 1~ "c", re6pectively, of the dsive pin of FIGU~E 60 FlGURE 7 i~ a partial seceion~l view taken along line 7-~ vf FIGURE 6 cho~in~ the lever and ehe shifter to ramp the drive pin to ehe rear of the trsc~, and whesein the track i~ chown in ph~ntDm.

~lGURF ~ ront elevational ~ie~, similar to FlGURE 6, bsoken ~ay 8nd pa~tly in ~ec~ion di~ra~a~ical~y ~howin~ the interrupt ~echanicm operative to ~hift the drive pin follower ~hown ~t loc~tion6 "a"
~colid) ~nd "b" (dotted~, recpectively, fro~ ~he rear of ~5 the du~1 s~rf~ce tr~ck vi~ the ~hif ter to the front of the ~ruck ~6 6ho~n st loc~tioDs "c" ~dotted~ ~nd "d" (dotted), respectively.
FlGUR~S 8b, Bc ~d d are ~ch ~c~ion~l Yie~ taken ~long li~e~ "b-b"a "c-c" ~nd "d~d'~3 re6pe~eively, of 3~ FlGU~ ~ cosrecpcndin~ to the nDted loc~ions 'b", "c" and ~'d" ~ re~pectiYely ~ of ~he dri~e pin of ~GUXE ~.

FlGURE 9 i~ ~ parti~l ~ectional view t~ken 910ng line 9-~ o$ FIÇUR~ 6, ~bo~ing the lever and the ~bifte~ to s~mp the drive pin to the front o~ ~he trsck, ~nd ~hereiD th~
trsck i~ ~hown in ph~nto~.

~IGUBE 10 i6 ~ front elev~ti~nal view, ~i~ilar to FlG~RE 6~ broken ~ay ~nd partly in ~eetion diagr~atic~lly ~howin~ the interr~pt mechani6~ oper~ti~e to shift the driv~ pin follower from the front of the duel culfsce track ~ 6ho~n ~t locations "~ olid) "b"
~dotted) ~nd "c" (dot~ed) respectively, via the hif~er to ~he rear of the tr~ck a~ loca~ion "d" tdo~ted).

FlGURES lOa ~nd lOd sre each sectional vie~ t~ken ~long line~ "a-a" ~nd "d-d", sespec~ively, correspondin~
to the ncted lo~tiDn~ "a" ~nd "d" of the drive pin of FlGUR~ 10.

FlGUR~S 11, 12 &nd 13 are per6pective vie~ of the ~min~ linkage of the i~terrupt ~echanis~ shift~ble respon~ive to the ~y~tem parameter6 wherein FlG~BE 11 ~ho~s the ~lignmen~ rod rdjacent the "X" line representing the unar~ed ~ode; FIG~RE 12 ~hows the ~lignment ~od ~dv~nced ~o ju~t cro6~ the "X" line respon~ive ~o the ~sigger bein~ pivoted on ~ indicated by the he~vy srrow but the linkage sem~in~ unsr~ed in th~t the DctuatOr ba~e i~ 6till ~ gO~æ di~tznce ~ehind the "X" line; ~lGURE 13 ~how6 the linka~e ~r~ed in ~h~t ~he alignment rod h~s been ~dv~ced ~o ~djac~ne ~he "Y" line snd the ~c~ator ~se i6 ~djaceDt the "X~ e ~e~ponsi~e to the duAl ~ctu~ti~n of ehe ~ri82er~ ~nd ~be p~obc lever ~ d ~e~p~ive to ~he tool contacting the workpiece. (Figs. 11-13 appear on the ~ame sheet as Fig~ 3) DESCRIPIIO~ 0~ ~HE PREFERRED E~ODl~E~I

In the illu~trated e~bodament of the inven~ion a fa6teneT tool de6cribed gener~lly ~s 20, is ~hown in FIGURES 1, 2 ~nd 6. The toDl 20 hs~ 8 housin~ 22 in whi~h i i6 ~ounted B 6uitabl~ power ~ource, su~h ~ a univDssal ~otor 24 ~hown di~gra~aticslly in FIGURE 3 ~nd psrti~lly in FIGURE 2. The ~otor 24 hs~ an arm~ture 26 and 3n ~rmature ~haf t 26 journ~led in ~ pair of ~e~ring~ 3~ arc 32 ~ffi~ed in a horizon~al mDtor c~ing 34; ~nd gear ca portion 36, re6pectivelyO ~he forw~rd portion of ~he ~otor cssing 34 i~ connected to the vertic~lly disposed gear c~e portisn 36 of the hou~in~ 22. ~he ~rm,c.ture xhaft 2~ ha~ an ~xis 3~.
~he hou~ing 22 ha~ ~ curved h~ndle portion 40 ~hi~h 1~ extend6 from the rear ~op of ~he gear c~e postion 36 in ~paced relation~hip to the motor c~ing 34 to turn downw~raly at the reAr 37 of the housing 22 to join into the ~otor casing 34. Ihe handle portion 40 fcrm~ an sperture 41 for convenient grippin~ of the tool 20 by the oper~tor, nnd aids in i~ control nd mAnipul~tion. A
rein~orcin~ web 42 ~xtendfi fro~ the ~ottom of the re~r 37 of the hou~i~g 22 ~d jacent the motor ca~ing 34.
The f~stener tool 20 muy be de~igned to drive any c~nvention~l f~steners, ~uch 8~ ~talple~, t~ckc, ~ or th~ like ~hich ~re ~il3ble in the m~rket, ~ith staples being ~h~ repre~en~ative f~ener 6hown in the pre~2sr~0 e~bodi~ent hereinO lndividual se~ple~ 44, in the ior~r, 4f ~lide p~k 46 eont~inin~, ~ plur~lity o~E ~t~ples a~ is ~hown in F1{;1JRE 1 ~e lo~ded in~o ~ ~uie~lble ~n~gazine 4~?
in which the ~ck 46 will be biaced to~rd ~he ~ron~ S0 of ~he hc\u~in~ 22A ~he ~sl2~zine 4A i6 ~In irltegr~l psrt o~, ~r may be ~t~ched to ~he housing 22 snd/or ~b 4~ in sonve~tion~l manr.e~ 6uch ~ B by f~stener6 51 ~own in FlGlJRE 1 The gear ~6e postion 36 o~ the hvu~ing 22 define6 cavity 52 sho~n is FlGURE 2 ~hich open~ out~rdly fro~. a rear wsll 53 towasd the front 50 and ic enclo~ed by a flct front cGver 54 ~ecured ~o ehe gear c3se portion 36 by f~steners 56, Dne of which i~ sh~wn in FlG~RE 2.
A fsn 58 i~ ~ffixed eo the front ~ide of the as~.ature sh~ft 28 ~ ~hown in FlG~lRE 2, for conventional cooling of the ~otor 24 ~hereby ~ir will enter and exit through ~uitable vent opening~ of ehe ~o~or c~in~ 34, ~ith onl~
l~ the inlet openin~ 60 being shown in FlGURE 1. A pinion 62 m~y be f~rmed integr~lly with the ~r~sture shaft 2~, or 9S
showD in FIG~RES 2, 3 ~nd 6 preferably i~ for~ed on the fsont end of s hollow sleeve 64 ~ffixed to ehe front portion of the ~r~ature ~haft 2& at the front besring 32.
The motoT 24 i~ de~igned to operate continuousay for extended perio~s of ~ime at a no lo~d speed in the r~nge of 28,000 to 30,000 spm, ~nd loaded rot~te~ st ~bout 27,000 rp~. The motor 24 develop6 Dbout 15 foot pounds o~
force in the iastener tool 20. The motor i~ rated st 6ubstanti~1 0.25 hDrcepower ~"HP"~ ~nd develops 8 ~sximum of ~pproxi~tely 0O5~HP. Electric~l energy will be 6upplied ~o the ~o~or 24 through ~ line cord 66 ~hich is connecteo in-circuit with the motos ~4 through ~n ~OD~ O~f~ switch 6&, with the c~d being conne~ted e~ the handle portion 40 of the hou~ing 22 throu~h ~ 6tr~in relie~ 70 ~ 6h0wn in FlGUR~ he ~otor 24 ~ e ener~i~ed ~y ~ctu~tin~, th~ ~witch 68 ~o the "~n" po~ition ~nd will run continuously theresfte~ un~il deeneYgi~ed by ~hif~ he ~witch 6~ to ~he "off~' position. Ihe pinion 62 being ~ffixed tD the ar~a~ure 6h~f~ 28 will rotate ~i~ult~neously ~i~h the ~r~at~re ~h~fe 28~
In ~ddition to the hou~ing 22, the ~otor 24 and the ~a~ine 48, ~he f~ene~ toDl 20 i6 ~ade up o~ Y~riou~
~6embli~s, ~0~6e~blie~ ~nd co~ponen~6 ~hish will be ie~cribed ~ore fully herPan~f~er, and ~re serely identi~ied herein Dnd YeferreD to in connection with FIGURE i as follow~: ~ driven ~eDber or ~eGr 72 havin~ an ~xi~ of ro~ation 74; ~ drive bar 76; ~nd ~n interrupt ~ech~nism 78, including ~ drive pin ~0 havin~ an 9Xi5 ~2, a track ~4, a fihiter R6, a lever 68 and an ~r~.ing lir.k~e 90 .
~ he gear 72 i6 journaled by a bearing 92 to rocate ~bout axi~ 74. ~he bearing 92 i~ ~ffixed to a boss S4 projecting iro~ the wall 53 of the gear ea6e por~ion 36 toward the fron~ 50 ~nd affixed there~o by ~ threaded fa6tenes ~6 being ~c~ewed into e ~apped hole therein. Ihe track ~4 is ~f f ixed to ~he bos~ 94 inwardly of the gesr 72 and re~ins 6tation~ry thereon. A pluraliey of 1~ circumferentially 6psced tee~h 9& ~re for~ed on the ~e~r to me6h with and be driven by ~he pinion 62. A ~ingle counterbore 100 sho~n in FlGURES 2 and 5 i6 formed on a radi~l line inter~ediate the axi~ 74 cnd the circumference ~f the gear 72. ~he drive pin &0 i~ di~pofied in ~he counterbore 140 to rot~te ~ith the gesr 72, ~nd is sxiall~
free to be ~hifted relative thereto. To this end the coun~erbore 100 i6 sized to receive 8 body por~ion 102 of the pin 80 in its smaller daameter ~ection ~nd to have a roller 104 nejt in i~s front f~cing l~r~er di~meter Z5 ~e~ion~ ~he ~olles 104 of the pin 80 ifi tsepped ~etw~en the body portio~ 1~2 ~nd ~n ~xle 106 press~fit~ed into a centr~l hole in the body 102. The roller 104 i6 free to rot~te upon th. ~xle ~ut c~nnot be 3xi~11y re~oved from the pin 80. ~he follo~er head l~B i8 form~d on ~he end of 3~ the pin B0 remote f~om th~ soller 104 ~nd i~ of 61ightly l~r~er ~ eter than the body portion 102. An in~er~edis~e ¢ectio~ 110 Df reduced di~Deter ext2nd~
betweon ~he body 102 and the ~e~d 108. The counterbore 100 ~d the pin 80 ~e coincident ~x~g ~ ~he ~xis ~2, a~d ~he ~se~ 3~, ~4 ~d ~2s re~pec~a~ly9 ~re par~llel.

The fa~ten r tool 20 h~ a rot~ry po~er 60uroe 112 formed by the ~sembly therein of the moto~ 24 ~Dd the ~ar 72.
The drive b~r 76 6hown in FlGURES 2 through 5 is 8 flat "I" ~haped plate ha~ing ~ horizon~ally e~enoing rectangular top 114 with ~traaght oppD6ed sides 115 anc extending fro~, the bottoD ~hereof i5 ~ cener~lly disposed rect~n~ulsr 6te~, 116 extending ~ertically downwardly ~ith oppo6ed ~ide~ 117 ~hich termin~te in ~ flAt ~riking ed~e 11~. A ~lot 120 i~ for~,ed in the upper pDrtion of the top 114 to extend in ~ ~traight section 122 fro~, the le~e ~ide thereof a~ viewed in FlGURES 3 snd 4 in a horizon~al disection toward the ce~ter to curve downwardly throu~h a curved 6ection 124 extendin~ in ~n src of 45D snd extending therefro~ into an inclined section 126 ~hich e~tend~ 8 short di~nce to ~erminate sdj~cent thi lower right hand corner ehereof. The drive bar 76 has 8 6tart po~ition in which the bar 26 i~ 6tationary snd helo by a ball detent 126 bia6ed to en~a~e ~n Aperture 130 formed in ~he upper ri8ht hand corner of the top 114 Yia e light 6prin~ 132, ~ith the ~pring 132 ~nd b~ll 128 di~po~ed in a rece~ of the ge~r c~ing portion 36, shown in FlG~RE 6.
The ttart po~ition of the bar 76 i~ ~hown in Fl~RE 4a, wherein ~he gear a~is 74 is coincident to the renter of ~he ~rruatæ ~ection 124. ~ot acciden~ally, the arruate ~ecti~n 124 c~r~e~pond to ~ dwell ~ngle shuwn in FlG~RE
4~ a~ a~ Yre 134 hsving ~ 45 ~ngle, ~hich arc 134 i6 l~cated ~e~een th~ dotted lined pin 80 ~nd the ~lid lined pin 6~ of FlG~RE 4~. Ih~ drive pin 80 will tr~n6cribe a carcul~r p3th, geDer~lly de6ign~ted 136, h~ving ~ r~diuG equ~l t~ the di~t~nce from the ~ 74 ~he ge~r 72 ~ the ~ 2 ~ the dri~e pin 80.
~ seces6 140 i~ ~or~ed on the rear f~c~ 142 of khe fron~ cover 54 ~o ex~end fDrw~rdly ~ 6ufficient di6tance 3~

~o that the co~plete ~hic~ne~6 o~ the drive b~r 76 may be di6posed theTein ~ shown in FlG~R~ 2. The r~ce6~ 140 ha~
6tr&igh~ 6ide~ 144 opps~ite esch other ~nd ~p~ced ufficiently ap~rt to guide the ~ide6 115 of the drive bnr 76 snd provide l~ter~l support therefor, ~hile the bottor 145 of the rece6s 140 ~hown in FIGUR~S 6~ und 6b ~ill ~erve ~6 ~ bessing ~urf~ce ~nd permi~ reciprocstion of the dri~e bsr 7S therein. The front cover 54 ~l~o ha~ a botto~ rece~ 146 in cD~unication ~ith the recess 14~ Ond the exterior of the hou~ing 22, ~nd in whi~h will be di~po~ed ~ ~ingle ~tsple 44 which i~ ~ized to h~ve ~
thickne6s ~ubstantially equi~alent to the thi~knes~ o~ the drive b~s 76. Only a single ~apl 44 will en~er the botto~ rece~6 146 ~t a time in conjunction wi~h the ~eciproeaeion of the 6te~ 116 of the drive ~r 76 in thc rece~s 146. In a~6e~bled po6ition 6hown in ~IGUhE 2 th~
drive bar 76 will be trapped ~ithin the rece6~ 140 of th~
front cover 54 by the precence of the gear c~6e portion 3 ~t th~ rear f~ce thereof to prevent re~Tw~rd ~,ove~.ent o~
~he drive b~r 7~ during it~ reciprocstion ~ithin the rece66 140. In that li~ited 6enie the ge~r c~se portion 36 will ~ct ~ ~ bearing s~face fos the r~ar fhce of the drive bDr ~6.
Tbe reciprocal cequence of the drive b~r 7S i~ cho~r.
6chematie~11y in FlGURES 4a thro~gh 4d. A~ the 6~rt of ~ny driving cycle the drive bas 76 ~ill be in the 6t~rt po6ition chown in FIGURE 4~ ~nd the b~ll deten~ 126 will be eng~ged in the ~perture 130 to hold ~he drive bar 76 ~tationary. Wi~h ~he ~otor ~4 on the rotATy po~er 60usce 112 will continusu~ly sot~te the ge~r ~2 c~sing the drive pin 80 to ~e rog~ted ~bou~ ~he circul8r path 1360 Bowever, if ~he roller 104 o~ the drive pin 80 i0 in the retr~sted po~i~a~n ~hown in ~he do~ted line r~pre~en~ticn o~ ~IG~R~ S ~he dri~e pin 60 will no~ e~gage the ~lo~ 120 and therefore the drive bar 76 will remain at rest and in th.e ~tart position. Th.e rotary power source 112 acts to rotate the gear 72 counterclockwise as is indicated ~y the arro~ 148 shown in FrGURE 4a wi~hin the circular path 13~.
5 The drive pin ~0 i8 shiftable axially by the interrupt mechanis~ 7~, and more particularly the shifter 86 thereof, so as to enter the slot 120 within the angled section 124 since the axially shifting of ~he drive pin is predetermined to occur within the specified dwell period or arc 134, which arc 134 corresponds to the angle~ section 124. The slot is sized to receive the roller 104 of the pin 80 as illustrated in FIGURES 4 and 5. The 45 arc is a sufficiently angular distance to permit full insertion or retraction of the pin into and out of the slot 120. Since the arcuate travel of the pin 80 during the dwell period matches the angled section 124 of the slot, the drive bar 76 remains stationary during such time. With the drive bar 76 in the start position shown in FIGURE 4a,the angled section 124 remains aligned with the rotary drive pin 80 during the dwell period of arc 134. The rotary drive pin 60 can only ~e inserted into or retracted from the slot 120 during the 45 dwell period of arc 134 in that it is only during such period that the circular path 136 corresponds to the section 124 of the slot 120. Upon the drive pin 80 being shifted forwardly to the solid line representation shown in FIG~RE 5 the roller 104 is inserted into the slot 120 so as to mechanically couple the drive bar 76 to the rotary power source 112 via the gear 72 to force the drive bar 76 to reciprocate in that the transversely disposed slot 120 will permit a "Scotch Yoke" type drive to occur in which only the ver~ical co~ponents of moticn are translated to the drive bar 76 from the circular path 136 of the drive pin 80. The solid line representation of the drive pin 80 of 5~

FIGURE 4~ corre6pond6 ~o the ~op center po~ition o~ the ci~eul~r path 136 Qnd at ~gr~ the btar~ of ~he power ~trok~ ~her~in the drive bar 76 will be ævsitively driven in a recip~oc~1 cysle in which the drive b~r 76 partake~
of a power eeroke during the fir~t leg theresf ~nd 3 return ~troke curing ~he second le~ ~hereof g~ will b~
~hown ~n~ de6cribed in 6ub~e4uent ~igure~ herein. Ih~
power st~oke ~ove~ the drive b~r 76 vertically downw~rdly ~nd the ~triking ed~e 11~ ehereof i~pact6 the ~taple 44 in the reces6 146 and c~u~e it to en~e~ the workpiece. Ih~
ener~y tr~ns~.itt~d fro~ th~ rotary power ~ource 112 thsough the drive pin ~0 to ~he drive bar 76 i6 m~ny ti~,es ~reater than the li~h~ hvlding pressure of the ball deLent 12~ which is e~cily overcom~ ~nd shu6 the drive ~r 76 i5 free to reciproca~e responsive the po6itive rotstion o$
the trive pin ~0 ~herein.
At th~ end of tbe fir~t qu~r~nt which cosrecponds to the mid-point of the power troke, the drive pin 80 will be st its left ~ost pozition of ~he ~tr~ight section 122 of ~he slot 120 ~6 ~hown in FIGVRE 4b, while the ctriking edge 11~ will ~t~rt to drive the ~taple 44 into the ~orkpiece. The drive ~r 76 con~inue6 it6 do~nw~rd reciproc~tion in ~he power 6troke ~b indicsted by ~he heavy srrow 150 p~in~ing in the ver~ically do~n~ar~
direc~ion, The end of ~be po~er ~troke and con6equentely the fir6t leg of the reciproc~l cycle of tbe drive b~ 76 occur6 ac shown in FI~RE 4c ~ith the 6~ple 44 ~ub~tan~i~lly oo~ple~ely driven into ~he ~orkpiece~ The drive pin ~0 i8 ~t ehe ~id-point of ~he slot 120 ~nd ~he botto~ af ~he cireul~r paeh 136.
Con~inued rota~iDn of the drive pin 83 ~long ~he circul~r p3~h 136 ~ ~hown in FlGURF 4d produce~ ~he ~econd le~ oi ~he recip~oc~l cycle oi ~he drive bar 76, ~3~

~-14-. n~ely the return 6troke in ~hich the ~rive b~r 76 will be driYen vertic~lly ~pw~rd as is indic~ted by the he~vy ~rrow 152 pointin~ in the verticslly upw~rd direction. ln ehi~ qu2tr~nt of rotation, the dsive pin 80 i6 di~posed on the right ~ide of the 610t 120 ~ithin the cur~ed section 124 and the inclined ~ection 126, respectively, with the latter being ~ngled downwardly to provide a "qui~h ~eturn"
of ~h~ drive bar 76 ts re~tore it sooner to itr t~rt po6ition. The accelersted returo of the drive bar 76 act~
to co~pensate fQr the dwell period ~rc 134 by r~turning the drive ~ar 76 to the ~tart po~i~ion 45 earlier in the 6scond le~ of the reciprocal cycle sh~n osc~rred in the fir~ leg thereof, thus, e~tablishing the 45~ ~n~le of dwell time. ~hile Jne of the ~taple6 44 i6 driven in~o the workpiece ~6 ~ho~n in FIGURE 4d, the next ~t~ple 44 of the magazine 4~ is oeho~n in dotted line behind the ~te~, 116 of the crive bsr 76 waiting for the drive bar 76 to return to the stsrt po6ition 60 that it ~n be ~pring bi~sed ioto po~ition within ~he rececs 146 wherein it ~wait the nex~ power ~troke.
At the end of the return stroke the drive b~r 76 as ~hown in FIGURE 4a i6 at the 6tast posi~ion, b~s co~plete~
both le~s of i~ reciproc~l cycle ~nd the ball deten~ 12~
i~ once ~g~in enga2ed in the aper~ur~ 130. Upon the drive 2S pin 80 reaohing the dwell period ~rc 134, ~he drive bAr 76 being se~tored to the ~t~rt po~ition i6 and will re~.ain ~tstion~ry.
At the end of one cycle of recipros~tioD of the drive b~r 76, ~he drive pin 80 i~ wi~hdrawn f ro~ the elo~ 12~
3~ durâ~g ~he dwPll period ~rc 134 6ho~n in FIGURE 4a. ~he interrup~ ~ech~ni6~ 7~ ac~ to preven~ æucce6sive power ~troke6 of the drive b~r 76. Ih~ drive pin ~0 i6 continuou~ly ~o~ed countercloc~ e ~lDn~ ~h~ circular path 136 pri~ to, during ~nd subsequen~ to ~he seciproc~l ~15-cycle o~ the drive ~r ?69 and ~heref~re, st ~he er.d Df .
each snd every ~eciproc~l cycle theseog, ~nd subsequent ~o the return stroke the dri~e pin 80 i~ ~ithdra~n ~rom the ~lot 120. The power 60urçe 112, continue6 to rot~te the dri~ pin 60 in i~ circul~r p&th 135. ~he interr~pt ~echani~ 7&, in1udes the drive pin 8D and cDn~sols the 6ame so th~t ~ithin the ~ys~em pasa~eter6, dictate6 the occurrence of ~he next recipr~cal cycle of ~he drive b~r ~ .
In order Dr ehe drive pin ~0 to ~e axi~lly ~hifted into the insertaon or re~raction pQ~itions ~hown in FlG~R~
5, n&mely c~upled or unc~upled to the driYe bar ?6, a co-action ~u~t occ~r between it and the ~e~sinin~
assemblie~ ~f ~he in~errupt ~echani~ 78.
The follower head 108 of the drave pin 80, best seen in FIG~RE 5 ha~ an annul~r knif~ ed~e 154 ~t i~ point of large6t circumferenti~l diameter, and lyin~ in a plane perpendicular to ~he axis 82. Ihe knife edge 154 h~s inclined annular s~rfRce~ extænding fro~ the knife eoge 154 ~owsr~ the 8Xi~ 62 and away fro~ each other to define ~ront edge 156 and 8 rear ed8e 15&. The ~ngle of incline a~ the ~s~e for ~ch of the edgefi 156 4nd 158 ~nd ~ill be equal to the ~n~le of incline ~ the front 160 snd th~ re~s 162 of th~ tr~ck portion6 of ~he du~l ~urf~ce tr~ck ~4. Ihe front ~nd re~r incliDes 160 ~nd 1~2, r~pecti~ely, ~r* t~pered upwardly ~nd in~rdly ~8 sho~n in ~IGURE 5 ~o joi~ kniie edge ~64 of the ~ra~k ~4.
The ~rsck &4 i~ o ~hown in FIGURE 2, vhich depict~
~be kni~e edge 164 lying i~ ~ pl~ne ~rpendicul~r ~o the 3~ 8~r ~xis 74. The ~r~ck ~4 i6 ~t~tion~ry ~nd it~ knife edge 164 liec in~ide of ~he eircul~r p~th 136 ~6 sh~wn in FIGURE 6 vhich ~he dsive pin 80 ~rezcribe~ ~s it ro~te6 ~i~h ~hæ ~esr 72 ~b~ut ~he ~e~r axi~ 74. BoweYer, the ~ife edge 164 h~ ~n ~u~er circumfere~ce which i~

5~

overl~pped by the lower ceg~ene ~f the follower 10& at either of the ed~ec 156 or 15~ thereof. In f~ct 9 the inclined edge~ and ~he cooperative angle there~etween will be eontinuously engaged in coopera~ive p~ir6 ~o that either the re~r ed~e 15~ will be en~aged u~on ~he front track 160, or the front edge 156 will be en~ged with the rear track 162, re~pectively.
Ihe driv2 pin 60 i5 re~tric~ed in ie~ ~xial ~ove~,ent ~ follo~-s: (1) tow~rd the front; l~) by ~he bo~tom 145 of l~ the front cover 54 when the follower 106 i~ ~t the front 160 of the track 64 or ~b) if the follo~er 10~ ic ~t the re~r 162 o~ ehe track 84, tbe tr~ck ~urf~ce 162 it~elf will li~it the for~rd moeion; Rnd (2) tow~rd the resr;
(a) by the follower 10~ enga~ing the fsont 160 of ~he tr~ck $4 if it'c at the front of the ~r~ck ~4, or (b) wieh the fo11Ower 106 st ~he rear 162 of the track &4 the roller 104 ~ ot~o~, in the coun~erbore 100 to limi~
rearward ~otion of ~he dsive pin 60.
To per~it the drive pin 60 to be Ehifted between the frone and rear tr~ck~ 160 ~nd 162, re6pectively, the track ~4 has a traekle~ or 61~bbed section 166 which c~ect6 ~ith the ~hifter 86 dipo~ed in ~uperp~cition ther~to. The sl~bbed cec~ion 166 ha~ ~ le~ding edge 16~ ~nd ~ ~rsilin~
edge 17~ ~hich will ~e3~u~e an ~n~le there~2t~een fro~ the ~xi~ 74 of ~pproxi~tely 45, ~nd which ngle ~ill ~ub6~ti~11y corre~pond to the dwell period Arc 134 ~ho~n in FlGU~E 4~. ~he ~labbed ~ection 166 re~ove~ ~he ovesl8p b~tween the correspsndin~ knife edgeæ 154 ~nd 164 of the pin ~0 ~ad ~rack ~4, re~pectively, ~nd proYides an spen $paced ~e~ured on the inside of ~hæ circul~r p~th 1~6 in ~hich the follo~er 10~ ~ay be ~xially uhift~d.
The ~hifees 66 i~ pivot~lly ~oun~ed wit~in ~he ge~r ca6e postion 36 by ~ cylindricle psotubes~nce 1~4 so ~6 to pivot ab~u~ ~Xi6 176, but ~he ~hi f t~s 86 ~f f i~ed ~herein -17~
~nd ~ill hold its ~xi~1 po6ition sel~tive to the ~xi~ 17~, A6 i6 illu6trsted in FlGURES 6 find 7. Ihe shiter 86 has ~ pointed le~ding edge 176 as viewed in Fl~URES 6 and 7 di6po~ed on the righe ~nd a ~r~iling ed~e 1~0 disposed the left side eherecf which includer ~ rec~angular tab 182. An ascu~te kni~e ed~e lB4 extend~ on the lower susf~ce of the 6hifter &6 ~ro~, the le~ding edge 17~ to the tr~iling edge 18~. The curve of thæ edge 164 iG for~ed with it~ cen~er 21 the gear ~xi~ 74 an~ ~6 viewed in FlGURE 6 ie~ r~dius will be ~reater than the r~diu~ of the circul~r path 136 but le~ thsn the s~disl di~t~nce to the top of the knife ed8e 154 of ~he he~d 1~8. Ihe fr~nt 186 t3nd the ~ear 188 edge incline~ ~re ~pereG from the knife-edge 164 an incre~in~ dict~nce ~ y fro~ each other ~t ~n ~ngle ~ub6tentially equ~l tc the anGlined ~ngle of the 0110w2r e~ges 156 ~no 15&, re~pecti~ely. The r~dial di6~ance~ sre se~ so that the edges 156 ~nd 15b will overl~p ~he rear 18~ ~nd the front 186, re~pectivel3.
Ihe 6hifter 86 i~ nor~lly bia6ed by ~ p~ir of ~p~eo springs 150 which is ~hort, ~nd 12 which i~ long/
refipectively3 CQ th~t a6 best seen in FIGURE 7 the leading ed8e 186 c~o6~e6 the plcne of the track ~4 to lie on ehe iront ~ice thereof, ~hile ehe trailing ed8e 186 i~ on the re~r ~ide thereof.
With the rot~ry pover sou~ce 112 on~ the ge~s 72 rot~tes the dri~e pin ~bout the circular p~th 136 and ro long ~6 the interr~pt ~echanis~ 7& vi~ 6hifter ~6 ir no~
~ctuated, th2 pin 80 will r~ain in the po6ition ~howr, i~
FlGURE 6 ~hich ~orre~poDd~ to ~he dotted line represent2~ion ~hereof in FIGUP~E 5 in that the ollower 10~ h~6 it fron~ ~d~@ 156 engage the r~r 162 of ~he tr~ck 64. Repre~e~tiYe loea~ion~ 001id) ~nd "c"
(dot~ed) ~nt ~he ~ectional vaew~ thereo~ a~ FIGURES 6B ~nd 6c ill~str~e ~ba~ ~ith ~he foll~wer 10~ ~t the s~r 162 ~9 ~5~

of the tr~ck 84 the drive pin i~ re~rnct~d from the drive ~r 76. Whe~ ~he drive pin 60 enters th~ ~re~ of ~he tr~ckles6 ~ection 166 8S ~t loc~tion "b" the follower 10 will engDge the rear 1~ of the shift~r 86 ~B 6hown in 5 FIG~R~S 6 and 6b 60 as to be r~mped resr~ardly ~nd therefore never cro~ from the reas cf the plane of the track h4 ~o the front ~hereof.
Ihe l~ver 68 ~hown in ~I5URES 6 ~nd 7 remains in~ctive. ~he le~er 8~ h~ ~ univer~sl ~ounting 1~4 and ~n ~rcuate flsL l~wer edge 196 which ~lope~ ro~ ~he pointed leading ~dge 196 which eng~ges the r2~s~srd ~ise of the t~b 162 to a trailing edge 200. The lever ~
bio~ed by æ ~prin~ 202 which nor~ally u~æe~ the tr0iling ~d~e tc be lif~ed forw~rdly oi ~he pl~ne of the tract 64 and the follower 106 9~ ~hown in FIGURE 6c ~o that even though the r~di~l dictar.ce would produce en~agement between ~he edge 200 ~nd the ioll~w~r 10~ none will nor~ally occur ~o long ~ the lever is pO6ieioned ~ seen in ~lGURES 6, 6c and 7~ Ihe lever ~ h~s Dn eol~rged ~perture 204 through which e~tendc ~n ~lign~ent rod 20 which ~c~6 ~o li~i~ the univercal ~ovement Gf the lever 8 and to which is connected an ~ctu~tor ba~e 20~ ~hown in FIG~RES 7, ~ ~nd 11 - 13 ~f the armin8 linke~e 90.
The sr~ing linka~e 90 ~ he b~6e a~tu~tor 20~ as ~hown in FlGURES 5 ~nd 13 i5 ~dv~nced ~ow~rd the iront 50 whenev~r the ~y~em ~s~me~er~ ~se ~et, in the preferred e~bodi~ene such pær~me~ers ~re ~ctu~cion of both a trig~er 210 ~nd ~ pr~be 212, ~ho~n in Fl~URES 1 ~nd 11. 5h~
~c~u~eor 29~ h~ ~ di~et2r l~r~er th~n ~he ~pestuse 204 3~ o ehe le~er ~6 ~nd ~ill move ~he l~di~ ~dge of the l~ves ~8 ~w~y so~ eh~ w~ll 53 to c~rry ~he ~hifter 86 vi~
ie~ t~b 182 ~herewi~h. 5he Dc~uator 20~ ~o~rd move~ent will force ~he shif~er &6 ~o pivot ~ 17~ ~cro~ the plsne of ~he erDck ~4 ~o th~t the le~di~g edge 17~ thereof i8 1Ll~

1 ~ -~ow sdj~cene the w~ nd IDn the re~r side of ehe tr~ck ~4 while the tr~iling 2dge 16D i~ Dn she front 6ide of the t~4ck 64, ~s be~t 6een in 'FIGVRE 9.
The drive pin hO ~hown ~t location "~" of F15UfiE 6 is 5 sontinuing in counterclockwise rotation pre~iou~ly described in connection ~i~h FlG~RE 6, but ~t location "b"
of FIGlJ~E 8 t~e ~ol~ower 10~ is ~rapped ~etween the re~
162 of the ~Y~ck 84 ~nd ~he fron~ 1~4 Df the ~hif~er ~6, ~ 60 6hown in FlGURE 8b, ~snd the follo~er 106 ~ill be~in to ride upon the ~hifter 66 which h~d previou~ly been ;s;echanically shifted cro~ the pl~ne oi the ~r~ck ~4 so that the shifter 86 will ~ct to r~,p the followe~ 10~
tow~rd the front 5~ ~t locstion "c", ~hown in FIGURE ~c ~nd followin~ the frsn~ trDch portion 1~4 of the shafter 86 will cross the plsne sf ehe ~r~rk'~ 64 knife ed~e 164 to be on the fYont 160 of the track 84 ~t loc~ion "d", ~chow~ i~ FIGURE ~d. ~he ~ollower 108, thus, i~ ~mped ~CrD~s the ~l~ne ~f the trsck ~4 f ro~ the rear 162 to Ihe fsont 160 ~herecf ~t the tr~ckles~ ~eLtion 166 thereo~ ~s liihown in FlGURE 6. Thi6 acts to ~xi~lly ~hif~ the drive pin ~0 fow&rdly ~s ~hown in FlGURES ~b, &c ~nd ~d from its roller 104 being xp~ced fso~ tbe ~lot 12~ of the drive ~sr 76 ~o being fully enB~ed therein. Once ~he drive pin bO
i6 e~g~ed with the dziv~ ~ar 76, continued rot~tion of ~5 t~e pin ~0 pro~uce~ ~ reciproc~l cycle of the drive b~ 76 ~nd the st~rt o~ ~he power ~troke. ~t loc~tion "d" o~
FIGU~E 8 th~ drive piD~6 60 ~ollower 106 i~ out of conta~t ~ith the fl~t ~rcu~te edge lÇ6 of the lever 88, because it6 radi~l di~t~nce f ro~ the ~xi~ 74 as tD grc~ he ~lope Df ~he ~dge 1~6 i~ tow~rd the sxi~ 74 80 ~h~t the r~di~ t~nce o~ ehe tr~iling edge 200 ~f the le~er will plDCe it iD ~n i~pact ~one ~ e the lever ~& h~d ~een ~hed fo~rdly ~y the 3ctu~tor 208 ~o plDc~ it i~
i~ter~ec~ion ~ e pl~ne of the tr~ck ~4.

I~ediately upon the dri~e pin'6 ~0 ~ollo~er 10~ .
~dv~ncing from loc~tion "d" of FI~RE 8 to loc~tion "~" of FlGURE 10, the followzr ao~ en~ges ~he æd~e 1~6 of the lever && ~ ~hown in FIG~RES 10 ~nd 10~. ContiDued 5 rotati~n of the followes 108 forces the lever ~8 to piv~
at it6 univers~l csnnec~ion 1~4 to ~ove the tr~iling ecge 204 rAdi~lly out~ardly to produce the oppo6ite ~o~ion ~t the le~ding edge 15~ thereof fro~ its dotted line position to its colid line po~ition of FlGURE 10 ~ relee~e the t~b 162 of the chifter B6~ ~hich ~hift~r ~6 will under the influence of 6prin~ 0 snd 192 ~e pivD~ed to resu~.e its FlGURES 6 ~nd 7 po6ition, ~ith the le~din~ edge 176 on the fow~rd ~ide cf the tr~ck ~4 and ~he tr~iliDg edge 1~0 on the re~rw~rd cide ~hereof.
At locDtion "b" ~f FIGU~E 10, the drive pin's 60 follo~er 10~ i~ connected within the slot 120 of the drive b~r 76, ~nd the drive bar 76 has co~pleted the power ctroke ~nd is be~inning the return fitroke~ with the follo~er 1~6 still riding the front 160 of the tr~ch 84.
Hcweve~, when the drive pin ~ollower 108 se~che~ loc0tion "c" of FIGURE 10, it now encounter~ the le~ding edge 17 of the shif~er ~6 ~t the re~r 1~6 of the ~hifter'6 ~6 ~nife edge 1~4. ~herefore, ~t loc-~ion "c" of ~lGURE 10, the follower 106 co~tin~e~ to ride the fr~n~ 160 of the tr~ck ~4 but now ride6 the re~r 16~ o ~he ~hifeer ~6.
The effect of ~hi6 i~ to ~'r~mp" or ~xi~lly-~hit~ the pin RO from ehe ~ront to the ~e~r of the plane of he tr~ck 64 ~nd to remo~e it~ rollel 104 fro~ tbe ~lot 120 of the drive b~r 76 which dri~e b~r ~6 h~ returned to th~ s~rt position ~ub~equen~ to it~ reciproc~l cycle.
With the ~hi~r 66 pi~o~ed in ~he po~i~ion shown in FlGU~ES 6 ~nd 7, and ~he dzi~e pi~1~ 80 ~ollo~er 10~
h~viag ~een r~ped ~xiRlly rearwirdly, ~ , th~ follower lOB ride~ o~ly the re~r lB8 ~r~c~ portio~ of the ~hifter 86. Agsin, the r~mpin~ ~nd axi~l ~ove~ent of the drive pin'6 80 ~D11ower 106 occur3 in the segion of the trackle6~ sec~ion 166. Th,e ~equence Df the r~ping will only occur with the dri~e bar 76 in the st~rt position and ~t~tion~ry.
In locsti~n "d" of FIGUBE lO, the drive pin'~ 8 iollower 10~ hs~ been co~pletely s~ped fra~. the front 16 of the t~ack ~4 to ~he se~r 162 of ~he ~r~ck ~4, ~s illu6~r~ted in FIGURE lOd. ~he drive pin96 hO f~llower 10~ ~ill now repe~itively revolve about it6 drive pin circle 136, riding the rear 162 of the tr~ck 84 snd ~he sear 1~ of the tr~ck portion of the 6hifter 86, repeatin~
~he sequence ~hown nd de6cribed in FIGUR5 6, 6~, 6b, and 6c to continuouLly cycle the~e~bout. ~he "~y~te~ be re-~rmed before the FIGURE 8 ~equence of the reciproc81 cycle including the power 6troke csn occur ~g3in. In ~he preferred e~odi~ent ~he re-ar~in~ i6 controlled by the interrupt mech~ni~m 7&, vi~ the ~rming linkage ~0.
The ~ys~em p~r~eter~ are ~et ~uch that even if the ope~ator continues to depres~ ~he ~ig~er 210 ~nd the probe i~ continu~lly eDg~ged by the workpiece, thereby ~ain~ai~in~ the probe 212 in ccntinuou~ engsge~ent with ghe le~er 88 ~fter ~he ~lGURE 8 cequence h~ been concluded, ~he ~hifter 86 will re~sin in it~ diss~med po~ition, with it.ç le~ding edRe l~B in front of the plane of the tr~ck 84, Ihe resul~ ic th~t dri~e pin ~0 will not be ~hifted durio~ itG rct~tion ~nd it will rem~in ~t ~he re~r 162 of the tr~ck 84. ~nother f~stner 44 c~n b~ f ired only by di~eng~ging Dne or the othes oi either the trig~es 210 or ~he pro~e 212, or both, followed by re-engaging of th~t ~hioh ~$ di~og~gedD or i~ both, ~h~n h re-eng~ging of ~o~h ~o th~t ~ow ~o~h the erigger 210 ~d ehe probe 212 ~re ~i~ul~enou61y ooce ~g0 iD e~ged.

In ~he preferred ~bodi~Dent of the f~c~ener tool 2~, the ~y~te~ p~r~eter6 for the &rming liDk~ge 90 ~re input~
from the tsi~ger 21~ Dnd ~he probe 212 snd ~re illustr~ted in FIGURES 1, 2, 3, 11, 12 ~3nd 13.
~he ~r~ing linka~e ~0 h~6 ~ junction b~rr~l 214 ~ounted in the re~r wall 53 Df the gesr c~se portion 36 o~
the bou6ing 22 ~6 illu~tr~ted in FlGURES 1, 7 ~nd 9 i~mediately behind the ~pest~re 204 of ~he lever ~o. ~he junction b~rrel 214 i~ ~ hollo~ cylinder open ~t one end~
with two oppo~ing lon~itudin~l ~lot~ 216 extendin~
inw~rdly from i~5 open end.
The actuator ba~e 20~ is CDnneCt~d to a plunger 21 61ide~bly ~ounted within th2 barrel 214 ~ ~hD~n in FlGURES 11; 12 ~nd 13. Ihe plunger 21a i~ split in lignment with the ~lots 216 ~nd in the ~plit therein i~
pi~otally ~f~ixed ~ at 21S ~ teeter 220 ~hich extends tr~nsYersely throu~h the basrel 214 ~nd the ~lot6 216 to oextend extesnally in opposit~ diseotion6 therefrom ~s view~d in ~15U~E 11 to form ~ left ~xten~iun 222 th~t is enB~8en by ~h~ ~ri8~er 21~ d ~ right exten~ion 224 that i6 en~ged by the probe 212. A ~prin~ 22~ ~orm~lly bias the plunger tow~rd the open end of the b~rrel to ~ove the ~c~u~or 20~ ond rod 206 to ~u~e the rear po6ition ~hown in FIGURES 11 ~nd 7. ~he ~ctu~tor 20~ ~nd rod 206 extend ehrou~h ~n opening 22~ in the w~ll 53 of os~e 36 ~5ee ~IGURFS 7 and ~) for~ed in ~lign~ent ~itb ~nd o~ ls~Per di2~et~r thDD the spertuze 204 of tbe lever 8~.
~he trigger 210 is pi~ot~lly ~oun~ed ~e ~xi6 230 ~nd b~ ~ finger p~tion 232 extending fro~ the h~ndle 40 ~6 ~hown in FlCURES 1 ~nd 2, ~nd a lever poreion 234 e~geable wi~h the left exeensiOn 222 of th~ teeter 22~. 0~ the oppo~i~e ~ide ~he pro~2 212 h~6 a cr~nk 236 pi~otobly connect~d ~o the ho~6in~ 22 ~t oxis 23&. The cr~k 236 ~0 ~n 'L~ hsped body bovi~ 8 ~Dir of p~r~llel fi~i~

-23~
horizcnt~l le~6 240 Dt ~he ~ase ~hereof, 2nd ~ransver~ely joined into a ~ertical ar~l 242. The le~s 240 ~re connected to pivot abo~t the ~i5 23~ ~nd the ~r~ 242 is eng~ge~ble wi~h the right ex~en~ion 224 of the teeter 22~.
A probe rod 244 ifi pivot~lly connected to the legs 240 intermedi~te the ~xi6 23~ ~nd the ~sm 242. Ihe rod 244 extends from ~hç cr~nk 236 to ~e affixed ~o a psir of inter~onnected lower pro~es 246, ~hown in ~lGURES 1 and 6, which p~obe~ have vertic~1 ~.lots 24~ which receive horizontal pin6 25~ ~o per~it li~ited guided vertical ~overent~ Ihe lo~er probec 246 are connestæd ~t the oppo~ite ~ide~ of the ~ront of the ~ear cs~ing portion 36 and will project a chor~ di6t~n~e belo~ the bottom of thr hou~ing 22. ~henever the tool 20 en~age~ the workpiece the probes 246 ~re ~oved vertic~lly upward, by the contact of the workpiece until the bottom of the housing 22 mahes contact therewith re6ulting in the teeter 220 being cr~nked ~t cr~nk 236 ~orwardly 8~ ~ho~n in FlG~RE 13. A
cpr;n~ 252 i~ conrected bet~een the hou~ing 22 ~nd the rod 244 to bi~ ~he probe 212 ~nd it~ co~,ponents vertically do~nward, 60 th~t the crank 236 i~ normally in ~he position 6hown in FIGURE 11.
~he ar~ing linkage 50 o~ the interrupt mech~nism 7 rem~ins unar~ed ~ illu~tr~ted in FlGURES 11 ~nd 12, wit~.
neither the t~igger 210 nor ~he pro~e 212 h~ving been ~ctuated in FIGURE 11, and with only one of them having been ~g~tiv~ted in FIG~E 12 ~d the one cho~n ~s bein~
~ctivsted being the trigger 21~, though either could heve been. The 9'X" and "Y" line~ ~how ehe ~oveDene o the sct~eor 20h ~d rod 206 di~gra~tio~ , ~ith no ~oveme~t hsving occu~red in FIGURE 11, and only ~light ~ovement of ~he rot 206 ~but not the ~ceu~tor 208) ~oving eoken place ~t the ~'X" line iD FIGURE 12. Ihe ~rig~e~ 210 ACtu~tor a34 ~ho~a i~ FIGURE 12 pivot6 tbe left e~ten~ion 222 of

-2~-the te~ter 220 csu~ing the plun~er 218 to be p~rtislly depre6~ed and to ~hift ~ ~hort di~t~nce ~rD~ ~he open end of the b~rrel 214. ~owever, the ~od d~es not re~ch the "Y" line and therefore the link~e 90 re~in~ un~rmed.
When both the trig~r 210 and the probe 212 ~re ~tu~ted, ~hen, in ~ddition to the lef~ exten6i~n 222 bei~g ~hifted for~rdly ~y ~he ~rigger 210, ehe right extension 224 i~ ~lso 6hift~d forw~rdly to ~ve ~he teeter 220 ~n equ~l di~tance on boeh ~idef thereof to ~ully aepre~6 the plunger 21S withan the barrel 214 &nd ~ove the 3ctua~0r 206 ~nd the rod 206 to i~ full for~-ard position, adj~cent the "X" ~nd "Y" line~, ~e~pecti~ely, as illu~r~ted in FIGURES 5 ~nd 13. Ihus th~ ar~ing linhage 90 b~co~es operstive by placing the lever ~ in its forward position of FlGUR~ ~ re~ulting in a ra~.ping of the ~hif~er ~6 to produce the reciprocal cycle of ~he drive b~r 76 ~hich ~s ~ho~n in FIGURE 10 i5 followed by a ~ub6equent ~u~omatic cycling Df the dri~e pin 80 to e~fect rele~se of the ~hifter 86 ~o reles&e ~he pin S0 from the drive ~r ~6 and re~tcre tbe drive pin 80 to ro~ary cycling only.
The interrupt ~echani~ inclu~es the arming linka~e 90 which so~uct6 ~ith the lever 8~ nnd the ~hif~er ~6 to initiate ~nd termin~e e~ch reciproc~l cycle of the drive bar 76 re~ponsive to tbe drive pin 60 being ~xi~lly ~hifted into ana out of ~ng~ge~ent ~ith the dsive b~ 76 so ss tc produce ~ ~a%i~u~ of o~e-h~lf she nu~ber of reciproc~l cycle~ 4nd po~er 6troke~ ~hereof ~or ~he ~otal ~u~ber of cycle~ of ~he dsive pin 80. Al~o, succe~ive powe~ 0troke~ ~se noe po~ible ~iDce ~ftes every reciproc~l cycle o~ tbe driYe b~r ~6 upon itG re~rn to the ~t~rt ~06ieion ehere i6 co~ple~e di~en~gement ~ith the ~rive pin 60 for ~t le~t on2 co~ple~e ~o~ry cycle ther~of beore i~ i~ pos~ible ~o ~gain inieiste ~

-25- .
reciprocsl cycle, but then only if th~ ~r~ing linkage ~0 he6 been ~ctiv~ted.
It will be under6tood t~a~ v~riou~ ch~nges in the det~ , ~eteri~lfi~ arr~nge~.ents of p~rts ~nd oper~tin&
concilions which hsve been her~in described ~nd illustr~ted in order ~o cxplain the nature of the invention m~y be made by those skilled in the art ~ithin the principle~ ~nd ~sope cf the inYention.

Claims (25)

CLAIMS:

1. A fastener tool for connecting fasteners into a workpiece, comprising:
a) a motor mounted in the tool for continuous operation during operation of the tools, b) a rotary driver connected to be driven by the motor, c) a reciprocal driver coupleable with the rotary driver to be reciprocated in a power stroke thereby to cause the fasteners to be connected to the workpiece, and d) interrupt means including coupling means to mechanically complete the connection of the rotary and reciprocal drivers to transmit motion therebetween, and uncoupling means operative after each power stroke to cause the coupling means to be uncoupled to disconnect the rotary and reciprocal drivers.

2. The combination claimed in Claim 1 wherein:
a) the uncoupling means is responsive to workpiece engagement and operator actuation both of which must occur before the uncoupling means acts upon the coupling means to cause it to couple the drivers.

3. The combination claimed in Claim 2 wherein:
a) the fastener tool has one power stroke for each reciprocal stroke of the reciprocal driver, b) the motor to partake of rotary motion, c) the motor to cycle at least twice for each power stroke, and d) the interrupt means coordinating the coupling and uncoupling means to permit the coupling means to couple the drivers for one cycle duration before the uncoupling means acts to uncouple the coupling means from the drivers.

4. The combination claimed in Claim 3 wherein:
a) the uncoupling means responsive to the cycles of the rotary driver to prevent the coupling means from coupling the drivers during successive cycles thereof.

5. The combination claimed in Claim 4 wherein:
a) the uncoupling means including a clutch, and b) the clutch actuated after every power stroke to uncouple the coupling means from the drivers.

6. The combination claimed in Claim 5 wherein:
a) the clutch is operative to actuate the coupling means to couple the drivers for one power stroke every two cycles during successive engagements of the tool with the workpiece and operator actuation of the tool.

7. The combination claimed in Claim 6 wherein:
a) the clutch including a track having a coupling surface and a shifter, b) the coupling means including a drive pin and a follower connectable upon the coupling surface of the track, and c) the shifter to selectively engage and disengage the follower from the coupling surface of the track.

8 . The combination claimed in Claim 7 wherein:
a) the track having two surfaces, a coupling surface and a uncoupling surface, and b) the shifter to shift the follower between the coupling surface and the uncoupling surface.

9. The combination claimed in Claim 8 wherein:
a) the track having substantially circular coupling and uncoupling surfaces of equal diameter, b) the follower prescribing a circular path of substantially the same diameter as the surfaces, and c) the shifter causing the follower to change surfaces by interrupting the plane of movement of the follower.

10. The combination claimed in Claim 7 wherein:
a) the rotary driver includes a gear, b) the drive pin of the coupling means connected to rotate with and be axially shiftable relative to the gear, c) the reciprocal driver having a transverse slot therein, and d) the uncoupling means selectively to shift the drive pin to be engaged in the slot to produce the power stroke.

11. The combination claimed in Claim 10 wherein:
a) the reciprocal driver having a start position, b) a detent means yieldly holding the reciprocal driver in the start position, and c) the uncoupling means to shift the pin during a predetermined period to be engaged into the slot to produce the power stroke.

12. The combination claimed in Claim 11 wherein:
a) the pin to prescribe a circular path along with the gear, and b) the slot, with the reciprocal driver in the start position, having a portion thereof aligned with the path of and adopted to receive the pin.

13. The combination claimed in Claim 12 wherein:
a) the arc of alignment between the pin and the slot is at least 45°.

14. A fastener tool for driving fasteners into a workpiece comprising:
a) a rotary motor mounted in the tool for continuous rotation, b) a gear driven by the motor, c) a drive pin axially shiftable in and rotary with the gear, d) a drive bar reciprocated in the tool for driving fasteners therein during a power stroke, e) the drive pin connectable to the drive bar to translate the motion thereto to produce a power stroke and a return stroke, and f) interrupt means engageable with the drive pin to disconnect the drive pin from the drive bar to prevent successive drive strokes relative to gear rotation.

15. The combination claimed in Claim 14 wherein:
a) the drive pin has a follower, and b) the interrupt means has a track for the follower and a shifter to shift the follower upon the track to cause engagement or disengagement between the drive pin and the drive bar.

16. The combination claimed in Claim 15 wherein:
a) a shifter actuator affixed to the tool responsive to operative parameters to control the shifter.

17. The combination claimed in Claim 16 wherein:
a) the shifter actuator including linkage responsive to successive operator and workpiece engagements, and b) the shifter responsive to the linkage to shift the drive pin into or out of engagement with the drive bar.

18. The combination claimed in Claim 17 wherein:
a) a reset means engaging the shifter to cause the shifter to shift the drive pin out of engagement with the drive bar after every power stroke whereby successive power strokes are prevented and at least two cycles of rotation of the gear are required for each power stroke.

19. A tool, comprising:
a) a continuously rotating drive source, b) first means connected to the drive source cyclically through a power stroke and a return stroke for driving an object, c) second means for disconnecting the drive source from the first means after one cycle without interrupting rotation of the drive source, d) means, supported for continuous movement with the rotary drive source, for connecting the rotary drive source to the first means and controllable by the second means to disconnect the drive source from the first means.

20. The combination claimed in Claim 19, wherein:
a) the first means reciprocates through a power stroke and a return stroke in a reciprocation cycle, and b) the second means includes an interrupt mechanism responsive to system parameters to prevent successive reciprocation cycles.

21. The combination claimed in Claim 20, wherein:
a) the second means includes means for reconnecting the drive source to the first means.

22. A tool having a housing in which is mounted a motor, comprising:
a) an impact member moveable along an impact path, b) a drive member rotatably connected to and supported for continuous movement with the motor, c) a track formed annularly in the housing, and c) means selectively guided by the track and operative responsive system parameters for connecting or disconnecting the drive member to or from the impact member.

23. A fastener tool having a housing in which is mounted a motor, comprising:
a) an impact member moveable along an impact path, b) a drive member rotatably connected to the motor, c) an interrupt mechanism operative responsive to system parameters to connect or disconnect the drive member to or from the impact member, d) the interrupt mechanism including a track mounted in the housing, a shifter and a drive pin, and e) the drive pin being selectively engageable with the track or the shifter to effect the connection and disconnection of the drive member to or from the impact member.

24 . The fastener tool claimed in Claim 23, wherein:
a) the shifter and track are moveable with respect to each other, b) the track is annularly formed within the housing, c) the track includes a discontinuity, and d) the drive pin engages the shifter adjacent the discontinuity.

25 . A one-shot actuator, comprising:
a) a prime mover, b) a yoke moveable along a path in a stroke, c) the yoke having a drive slot, d) a drive member rotatably connected to the prime mover, e) means for coupling and uncoupling the drive member with the yoke drive slot during one rotation of the drive member, and f) means for maintaining the drive member uncoupled after one stroke for at least one subsequent rotation of the drive member.