US1904951A - Punch - Google Patents

Description

April 18, 1933. P, PETER N 1,904,951

PUNCH Filed March 21, 1930 Qatar peter/i972 Patented 1 8, 1 933 i PETER rn'innscm or DEQR I imIcnI An-Q f] i Q i invention has for its tbj ect to prbvide a p nch which is SO censt'ructed thet itma be readily removed from the retainer in a die head. The invention particularly relates to V "6 small punches that are reindvably connected to a head-by a ball latchlocatedinblocks or sucketsin which the punches are steppedij-A's is; Well known in cennecticn with Such case; e large number of punches for punch a. plurality of holes in sheet materiel in a single stroke of the 1 press, it is) difficult to remove "One-0r more 'cfthe pun g the fact-that the stripper plate interferes. with. the engagement Of the punchiend pre- Vents Withdretjvtr'albffthe punch from its Socket. This is partimnefl 'true inwiewof the fact that the punches eftenbrea-k ofl, dnlyleaving thel'sha'nkegto gri Ith'a's been customary to provide en 'o enmg for the 'inisertion f d'wire thrmigh thestrippe'r plate and ancpeni'ng in the socket t6 displace the ball from it's latch eng ement, with the that the punches tightly f'fit the ockete, it "is difiicult to remove the punch from the secket even Whenthe ball is pushed out cf eiigagemeet. Disn1antling Of the=strippeif plate fr'cni the'pres'ser head" is invariablyrequlre'd. By my invention,'n1eans is provided whereby the punch may be'f orcib'ly removed from the socket, though itm'ay tightlyfit therein; Theinvention may be applied to"p ujnche s (if difierent forms ancLto illustrate apractical application of .the' invention, 1 have selected two or three forms (if punches; em bodying' the invention and thepunch removing tool to illustrate practical applicaticns of the invention.- The punches and the punch rei'neving tocl are" described. hereinafter: *7 [Fig 1 illustrates a fragmentary View of the punch die head and str'ipper plate and a punch fremcying" tccl. located in position. Fig.2 is'en enlarged view "of the punch muetrzited in Fig. 1. Bis-enmdtiefii 0f 'puDcheSQ herethere are as is ccmmcnly'the- Shank ef {the unch, but owing t6 the fact the punches have been withdrawn from; the

se'ctien taken -on the plane of [the line indicated'in' Fig. Fig. 5 is hiside viewer the punch illutrate'd Figfi. ,Fig. eis' an J end iew of-a third; term of unehs Figfl View of a-se'ctien taken (in-the hine-(if the line 7- 7 indicated in Fig. 6. ig; s is a side view of ztpiihch shown iii Fig. 6. l V As'is 'wellkiiown in connection with p nch;

'lccate' and secure the sg' cket propei esition with reference t6 the other 'puil'che' that its may be col'mectedltii the'head 4." A stripper plate 5 is commdnlys uppcifted hyineaii's 0f the pins 6 which ere 'slidable ihi the heed 4; and are spring pressed,- eeby the- Spi"ings 7. Th stripper 'plate 5" opef tee-tegengege the "m Sheetmeter to be ,p-u'n'ehed and secure it in pqsition during the puncturing operetion'efid uiitil the puncheeleeve the'sheet'jfltii-l thet is epereted upon; The spi 'ifigs7 epera';te to hold the stripper plate *5 "dewn' until after ,Thepunch 1 is held inpositien byineefi's' of the ball 10 that is locatedin a. hole c'cjn taining' it s ring14' vhich operate tqipuj h the ball 10 towards thelow'er end Ofthe'heIe 11; "The hole 11 is bered at an n le te the hole 12 thatfermsthe socket of 'the punch 1, and sc as'to form an openin het'w'ee'nlthe 'holee 11 and 12 forth'e'bell 10 t6 engage the shank of the punch-1E "The opening is, how

' ever, suflieiently em ui tc prevent theifes'cape of the bells sideo'f thepunc'hi is reiii)v adapted to engage the ball '10, and by reason 'wardly and-away and, consequently, A v

greater depth of the concavity13, also preof the pressure of the spring 1 1 to resist rota. tion of thepunch 1. The line of the convex I surface located in the plane extending through the axis of the punch, slopes up from the axis of'the punch; the ball-10, which seeks the vents the removal of the punch lthat may be,

caused by the frictional engagement of the j punch inthe sheet metal that is being oper:

e' v aliofthepres 5.

. engagement 2O movementspf the-jfpunch lain withdrawing.

upon by the] punch during the with- 'The'spring pressureagainst I sists "such turning movement of the punch 1," and, inasmuch'as' it is necessary that the-shankofthe punch lshould fit quite closely the 't has-been found that the frictionalsocket 2, a

between the socket and-the shank of the punch. 1 also I prevents longitudinal thej -punch' from the} SOCkGlJ-i This. is .particular-ly true-.whereJ the punch is broken off.

Also, -?owing to the close proximity-of the account.

stripperi' plate ";t0 lthe presser-head, and on. of, the. size or area of the stripper" plate, and in view of thesfact that, as rule, a a genum r suchzpu h s a i i butedover the area'gof the stripper plate, it

' is practically.impossiblefto remove any of the p n .W ent ey'h veb ok n- Tounlockth ball'latch,ia wire is inserted in aligned openings, 'suchiasthe. opening formed in the, stripperiplate 5, and the opening 16 formed in the block or soeketi2. The.

. 'openin g16;extends to the hole 11 in :which thballlO i located. The t n is lifted from the engagementwithithe punch; by thewire and ,whenan efiort :has been made to; engage the punch with; pinchers, at a point between the socket '2' andithe stripper plate 5, such efforts haveusually; been unsuccessful. and, r

' I y y i nth punch s ,areprovided '0 with a'rounde -5 I I throughthe 7 5'5 nates all suddenchanges spending in shape andsizeto the male that I is formed-on the punch, is used. The. ex-

owing, to the large number of 'punches and the --difliculty experienced in reaching the pu es, it'h iynvar b y; be .f und1 e ssary toremove the. stripper plate fro'm the whichwwould otherwise occur in the corners.

This is offparticular value where the punches are smalL]; For the removal :offthepunches, a toollfi'having a'female thread'19, correterior diameter. of'the' portionoffthe tool is slightly, less than the diameter of theopening '20. inithe stripp pla ;5 t 1 gh W h l ui gmove in re ina he "W k:

tosecurely connect .1, whereupon the dra-wn froni the-socket-2. The

sag the'pu fch d'rsmot h 1 1 d ate i Fi i .Iclaimtf 1 Whereby, the end of thetool 17 may a readily inserted through. the stripperplate and re.- 1 tated to engage the thread 18 of the punch). Preferably, the tool is provided with ahandle the tool 17 with thepunch,

22, whereby it may be, not only readily turned but also to draw'the punch from the die head.

Theconcavit-y 13 is alsopreferablyso formed. f that the punches may be turned by the tool, by a pressure exerted on the handle,.to forcethe ball; 10 upwards in the" openinglras the.

concave recess -13 is movedt awayfrom- 'the ball-10 and until the ball 1Q1ri O t cylind rical surface of theshank of the punch punch fl may be forcibly surfaces 9 of the concavity preferablyslopefrom the center it ofthe concavity.

considerable-torque,todisengage the ball and tight; of the punch-{in:its- -.soclet.i Thus, any one of Where the'fl punche 's have an s i nrsuc as th ts o n n igs- 3,.and

The handle 22 afiords a 1. neansiforgripping the tool to rotate, with V Wi w: th p n h,;-l o wit istmiding:.:fi H

a l rge n mb rl pun he maybe readily removed. from .the .diefhea'd without m v lo he r pper'pla e; l 1: b ongro AL, the thread-maybe formed only on the porf Q tions'of the surfacesthat areglo catedat dis greater than the otherportionsbf the s 'facesgsuch as,- thethread mayjbeformed :Q P r ions 2. ofr h p eh fia-si esus I? the. axis ,of

P r QnsL p o e. f the the Punch-than th PQrtiQD ct en l e y: b aPP i p n suchgas t ow il F gs: 6, in which-case the 1 th The. @01 square es eeme 1 above the square.end:;-3O of -the {punch and in med a t s ank 'andthei qu .eiid- --The-,too117;may be providedwith the female thread that corresponds to thegfemalethread in man- In combinat on withand; astripp plate, the-stripperplateconnectedto there n amfih S pper p tsher a r i ae punch'having a shank atone end and a shear for short limited movement s relative tof the a- 9 and the-tool ma be ins'erce d a'ted toien- 1 41 i .ing edge ati'the.v other end, ,the unch located I in. protei s h hwh p n l he rain having a .socket, aball latch locatedin 129 the ram forsecuring the punch in the T socket of the ram,the shank ime punch havingja sloping concave surfaceloperable; by rotative movement of thepunch toforcethe ballaway from the axis of. thepunch to release the punch from the ,ball latch, a-spring for press; ing the ball against the surfaceof thepun j; at apoint located at theffbottom of, mason-j cavity; thejpunch-having'faspiral c rrugati n" lo at iq tHs ank and e -we n ss normally above the lower surface of the stripper plate and adapted to receive a tool 7 having a spiral corrugated surface fitting the corrugated surface of the punch'and insertable through the said opening and adapted to engage the punch 'by rotation and rotate the punch to disen age it from the ram and withdraw the punc through the opening of the plate.

In Witness whereof- I have hereunto signed my name to this'specification.

PETER PETERSON.

Images