US 2011877 A
Description (OCR text may contain errors)
' ment oi the driving or-actuating means,
I A l\ /I 0re' specifica11y stated; an objectis to. pro
a riveting; devicezmbodying rpivoted levers which v are h s r t atin .j s n q j w i-j ing; the levers ;t0 w ar'd each other to perform a Patented Aug. 20, 1935 V g y g a The invention relates toIrivetingf tools of f th'e typein which both n m o slyiu ss t An objectt of the inventioniis to, provide an I improved tool; of this ch:araeter jin whichbthe wp keneri rmi m be s arke; s n e L 9 move relatively rapidly into, engagementwwith the workafiter-which arelatively slow work perterrai s. mc e t im er o i n: which the 'transition between thetwo speeds ec qm he i ra ly with. minimum mo working operation; said levers having cam Slit faces-thereon 'cooperating with saidfactuating 4 is "innenport ions of the 1ever-arms-extend between 6 andgterminateywithin .the aperture mea s o rc u a lat e r mad i t h 9f the levers, and? the actuating means }including cam surfaces whicl'i cooperate witlfi antifri'ctiori rollers 03517119.; levers to -producea relatively slow and",powerful-working movement oi the "levers;
said'partsbeing so related that the shift from one v setof cam surfaces to the other set is "gradual Anotherobjeet 'residesin the provision oi a to'ol having improved structural arrangements whereby :a-ycompaet', and sturdy tool-embodying few parts 'mayib'e producedior manufacture and sale M; at'ailowlcosti i Other 3 obj ects and iadvantages will vbecome apparent in"thejfollowingdescription 1nd from the accompanying draw ng; in which:.' f
.11 ,igs,. ;1- and ;2i;1are similarlongitudinal central rsections through agd'evice embodying (the features of th'e' invention, and showing the parts in two operativepositions,
T- Fig. 3 is atransverse section; threugh vice as indicated by the section line 35-3 inFigVZl fWhiIe the =invention is susceptible of; =variofus modifications and alternative constructions; I
have shown in the;drawing: and will herein rdescribe "in detail the preferred embodiment, but
it is I to be understood that; do not. thereby I inv tend to limit the invention-to the specific form disclosed, tbut'; intend to cover' all modifications ,Referringtothe-drawing, in whichal particu I lar form of tool ;has 1been shown; merely in .illustra'tion Tjof :the invention, -10 designates generally airframe which comprisesa housing-section l land -a sup'portingsection' i 2. ISince-the resent (file-- a rice iszaldapted for -,actuation-by fluid pressure the corp0ration'0iMichigan-" V .v o t,
" i1933, SerialNQ QGQZMS 'E .(oi-ivs izi A housingsectionisiacylinderwithin whichfafnisa ton assembly] i3 .iof 1 conventional, design 1 is, re jciprocably mounted. @Pres'sure fluid-is introduced dsof a rivet' blarikfmay be T'i-i vvwliwsiz 4 tial width arersuitablyrsecured, onet'oleach .ofjthelonger sidesof the flange to extendioutwardly aid between the plates and near the outer ends there oif said lever arms preferably being located one oneither side .and equidistantly ifromthe axis. of
defined by t e flange v L5,}; All) operating member 538, which is secured througha stub shaft 2 I and nut 32 to the 'pistonassembly rarer: movement therewith; is arranged to cooperate with the inner erids of thelever arms to effect aseparatingmovement of said inner ends with a resultingap The -approaching movement isl'preferably 'a -rapid one, while the working movement should -b e; con-F siderablyslower. The presentrdevice embodiesan improved "relationship between i the lever: ar ns and the operating memb'erwhich is effective "to produ'ce'the different speeds of '1ever-arm;move"- ment; rMore'o'ver,thestructure embodies means m by which the transition from one rate of'%movement tothe' other-is effected smoothly gradua'lly, and 'uninterruptedly yet occurs during-*a relatively short movement of the actuatingpiston;
' -In'the present instance, the outeraend iorlnose,
of the operating member 2il-is'of substantial width and when the structure is idle, as, shown in, Fig. 1, the nosev is opposed by cam surfaces fl' formed one on-eachof thelever arms llandhavingrelaf V tively steep slo pes; ,Considered together these camsurf aces converge, so thatra separating move merit oftheleven arms is produced by movement of theo'p'erating memberZQt'herebetWeen The steep slope ,of, the camjsurfaees 23 is pre mined, to produce the desired rapi Wa i of h the riveting dies. Those surfaces of the operating member 20 which are alined with the lever arms I! are fashioned to provide gentle sloping cam surfaces which are engageable with the lever arms. after the nose of the operating member has passed beyond: the cam surfaces 23. These gently sloping cam surfaces 24 produce the slow, powerful, working movement of the riveting dies.
A preferred meansfor producing a gradual and smooth change from onespeed to the other comprises, in this instance, antifriction rollers 25 or the like which are located near the ends ',of the lever arms and are so disposed that the cam surfaces 23 extend substantially tangentially from the rollers to the ends of the lever arms. Moreover, the rollers are located with peripheral porand mounting the antifriction rollers'on studs 26 between the arms of the yoke thus formed.
In order to guide the'movements of the piston assembly I3 and the operating member 20, a transverse plate 21 is'pinned, as at 28, in aslot 29 formed in the nose of the actuating member. The ends of the platell engageopposed slots 130' formed in the inner faces ofthe plates IS. The
plate. 21 is preferably located intermediate the leveharm l1 so that'the plate, inthe idle p'o'si f r the may be ki aat i n file comprisinga wedge member reciprocable in said' casing in-a direction longitudinally of and between the levers and having a pair of'oppos'ed cam surantifriction rollers "25- for engagement thereby l properly to locate the'lever. arms'with respect to the nose of the operatingm'ember 20. Set'screws.
3| carried by the" opposite ends of the flange l5 may be provided for limiting the extent: of .out-
ward movement of the inner ends of the lever arms." r i In operation, assuming that the parts have the relationship "shown in Fig. 1,: admission oflpressure fluid to "the cylinder causes thepiston and operating member to'move forwardly. The nose of thefope'rating member engages the steeply slop-' ing cam surfaces 23 and causes the riveting dies to'be moved rapidly into engagement with a rivet blank. Approximately at the moment of such engagement, the nose of the actuating member passessmoothly from thecam surfaces .23 into en- 'gagement'with therounded surfaces of the anti friction 'rollers' 25. Subsequently, the cam surfaces 24 engage the rollers and the working operation; is performed by the resulting slow and powerful stroke.
It will be evident from the foregoing that the 3 l of cam surfaces on the levers and another set on the operating member, the invention simplifies manufacture by eliminating the difficulties encountered when two cams of differentslopes are formed on a single part; h
I claim as my invention: a j r A 1. A riveting tool "of the jaw type comprising,
7 in combination, a tool body having a casing and a jaw supporting portion projecting a substantial distance forwardlyfrom the casing, a pair of levers pivoted on the forward end of the jaw sup- 1 porting portionin transversely spaced relation and providing opposed forwardly projecting jaws and opposed rearwardly projecting operating arms, said'casing having an opening in its forward endfor. receiving the rear ends of said operating arms, and actuating means for said levers comprising a'wedge member reciprocable in said casing ma direction longitudinally of and between the levers and having a'pair of opposed cam surfaces gently sloping outwardly and rearwardly from its forward end, and a pair of rollers mounted *on the rear ends of the operating arms, said arms I having a pair of cam. surfaces at their rear ends diverging sharply outwardly and rearwardly substantially tangentially of the rollers and engageable by the forwardend of the wedge member to impart a rapid approaching movement to said jaw, and said roilers'being disposed so that the inner:
peripheral portions of therollers project inwardly from the inner side edges of the operating arms for engagement with said gently sloping cam s'urfaceson the wedge member in the movementof the latter forwardly between the arms;
i 2. A riveting toolqof the jaw type comprising,
in combinatioma tool body having a casing and a jaw supporting portion projecting er-substantial distance forwardly from the casing, a pairof' and opposed "rearwardly "projecting operating armasaid casing having an opening in its forward end for receiving the rear ends of said opf erating arms, and actuating means for said levers faces'gently slopingoutwardly and rearwardly the rear ends of the operating'arms, saidarms having a pair ofcam surfaces at their rear ends able'by the forward end of the wedge member to from its forward end, a pair of rollers mounted on imparta rapid approaching movement to said jaw,
and said rollers being disposed so that the inner peripheral portions of the rollers'projct inwardly from the inner side v edges of the operating .arms for engagement with said'gently slopingcam surfaces on the edgemem er in-the'movemen't'of the latter forwardly between the arms, and a block projecting from the forward end of the wedge member and operative in the rearward position of the wedge member to space the rear ends of' the operating arms apart with therear' ends of the sharply diverging cam surfacesdisposed outwardly from the forward ends of said gentlysloping surfaces of the wedgemember.
3. A riveting tool of the jaw type comprising,in combination, a support having a pair of levers pivoted thereon in transversely spaced 'relationand providing opposed forwardly projecting jaws and opposed rearwardly projecting operating arms, and actuating means for said levers comprising a wedge member reciprocable in a'direction longi-' tudinallyof and between the levers and having wardly andrearwardly from-its forwardiend, a pair of rollers mounted on the 'rear ends pair of cam surfaces at their rear ends diverging is a pair of opposed cam surfacesgently slopingoutof the operating arms, said arms having a sharply outwardly and rearwardly substantially faces on the wedge member in the continued fortangentially of the rollers and enga'geable by the forwardend of the Wedge member in the initial forward movement thereof to impart a rapid approaching movement to said jaws, and said rollers being disposed so that the innerperipheral poritions thereof project inwardly a short distance from the inner side edges of the operating arms I for engagement with said gently sloping cam surward movement of the latter between the arms, and means operative in the rearward position of I the wedge member to space the inner: ends of the operating arms apart with the rear'ends of the sharply diverging cam surfaces disposed outward.-
lyfrom the forwardends of said gently sloping f surfaces of the wedge member. a
" 1 ERNEST H. SHAFF."