US1393040A - Punch and die retainer - Google Patents

Description

C. 0., C. A. AND 0. K. RICHARD.

PUNCH AND DIE RETAINER.

Patented Oct. 11, 19

iiimmlm- 4 w l'r x 221mm. 2 J 1 WWI I W m VJ UNITED STATES PATENT OFFICE.

CLEMENT C. RICHARD, CLARENCE A. RICHARD, AND OTIS K. RICHARD, or DETROIT, MICHIGAN.

HHSSUED Specification of Letters Patent.

Patented Oct. 11; 1921.

Application filed November 19, 1919. Serial No. 389,136.

Improvement-in Punch and Die Retainers,

and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, refer-- ence being had to the accompanyin drawings, which form a part of this speci cation.

This invention relates to tool retainers and the principal object of the invention is to provide a retainer means for the tool to prevent withdrawal thereof from the holder. The principal feature of the invention is involved in the provision of a retainer having an aperture 'for the tool shank and an angularly positioned aperture opening into the said first named aperture and containing a spring pressed ball partially extendin into the tool retaining aperture to binding yengage the shank of the tool and prevent wlthdrawal of the tool from the retalner. A further feature of the invention is involved in the construction of the tool shank in which a groove is formed to receive the ball, the

groove in cross section having a radius equal to the radius of the ball and which when the ball is seated therein prevents rotation of the tool in relation to the retainer. An addi tional feature of the invention is involved in the peculiar character of the ball receiving groove which groove is arcuate in a plane parallel to the longitudinal axis of the tool and also in a plane at a rightangle thereto, the radius of'the latter form being equal to that of theball whereby the tool is accurately positioned and held from rotative movement. Another featureof the invention resides'in the -provisi'rnn-of a punch: and die retainer of the character above set forth in which the ball retaining 'aperture 'for' the angle substantially opposite to that of the' ball retaimn aperture for the punch whereby the with rawal movement of the punch from the'die prevents the longitudinal movement of either tool in its holder and prevents thedie from following the punch or the punch from remaining in the die. Thesethe ball is and other objects and the several novel features of the invention are hereinafter more fully described and claimed and the preferred form of construction is shown inv the accp npanymg drawings in which 2- I* igure 1 is a section througha punch and die and retainers therefor illustrating the means for securing a punch or die in the respective retainer. i

F g. 2 is a section through the punch and retainer taken on line 2-2 of Fig. 1.

We have preferably shown in the drawing a tool retainer as used with a punch and die and as will be noted the retainer 1 is formed with an annular flange 2 at the upper end thereof which is secured a ainst the punch plate 16 by means of a mem er 3 fitting over the said annular flange and encircling the retainer and secured to the punch late 16 by fillister head screws 17 shown in ig. 1. In

this manner the retainer is secured to the punch'plate and held from rotation and as will be noted the retainer 1 is centrally apertured to receive the punch shank. Within the wall of the said retainer is an angularly positioned aperture 4 in which a ball 5 is positioned. Adjacent the end of the aperture opposite rovided an annular groove in which is positioned a spring washer 6 against WhlCh one end of the spring engages the opposite end of the spring engaging against the ball 5 as shown. It is to be noted that the aperture 4: opens into the central aperture but that the opening between the two apertures is less than the diameter of the ball 5 thereby preventing the ball from passing out of the aperture 4 at the bottom. As Wlll be noted from Fig. 1 the punch shank 8 is provided with a roove arcuate in a plane parallel with the ongitudinal axis of the punch and also arcuate in a plane at a right angle to the aforesaid plane, the radius of the last vnamed groove being equal to the radius of the ball '5. It, can be seen more particularly from Fig. 2 that the ball 5 extends into the groove 9 in the-punch shank and is tightly held in engagement therein by the spring 7 the opposite side of the ball at the same time eng mg the angularly positioned wall of the aperture 4.

In the lower half of Fig. 1 is shown a die .or die block .10 which .is held in aretainer similar to that of the unch shank and this die block is "provided with a groove 9 similar tothe groove 9 in the punch shank. The retiter negatively" v whereupon at at the punch ordf block may bee'as'ily ea drawntainer 1" is also provided withan angularly positioned aperture 4 in" the Wall thereof and a central aperture is provided therein to receive 'the'die'or die block 10. Within the aperture l qis provided .a spring" washer 6 against which one end of the sprlng 7 engages, the opposite end of the said spring engaging the ball 5 which device is similar to that shown in the upper half of Fig. 1',"

being positioned at an opposite angle as shown. The spring 7* in like manner forces the ball into the arcuate groove 9 of the die or die block 10 and prevents the same from withdrawal from the retainer. The retainer is also provided with an annular flange 2 and a member 3* is provided similar to the member 3 encircling the retainer and providing in combination therewith an additional wall supportfor the blockwllic'li aidsin'pr'eventing breakage of the die block from the heavy blows delivered by the punch head.

The assembly of the device is as follows: The punch 8'is forced by the operator into the central aperture in the retainer 1 and when positioned as shown in" Figll, theball 5 engages in the groove 9in'thepu'nch shank preventin the punch from rotation in-relation to t e retainer and atteiiipted withdrawal' of the punch froiii the retainer is prevented I by the binding actionof the ball 5 between'the angular wall of the aperture 4 and the wall of the arcuate' groove 9of-the punch'shanks. It is to be noted that theend of the punch shank 8 en ages against the punch plate 11 against hich' the retainer is secured so that upward movement of the punch is prevented and by the use of the spring pressed ball engaging in the arcuate groove in the punch shank the punch is locked in the retainer and is held immovable therein; This is also true of the die or 'die block 10, the said die being prevented from downward movement by the die plate 18' and prevented from rotation or upward movement by' the sprin pressed ball 5 enwagim in ale-mute grodve 9 in the die-bleak r3 V evident that the deviceis'of a simple nature alid accomplishes the obj this desired and by order to relnoye either'the punch 'or die from the respective retaineflthe opera-tor may ext'enda rod or similar instrument through the ap " ram 12 or 12"" i the-flat face of either raai'ne1 and fet -e t a tan a or 5% baekinto the aperture 4' or 4* may from and out of the arcuate groove 951 9 ih the punch or" die sea the a peeaee ratifies. It an be noted that the retainers are ioiilir'nitied to i of tool bii't'may'he punch drill presses andother machines where a tool nust meets-ant be hid from metres and at the trait aperture,- a tool 1 retainer heid'in' position e are t ta used in difi relit'types am new 1i5rfgitiidina1 iaaeerasnain relaitifonto' the retainer or chuck within which it secured; In mediate artist-04 tatioh the were a! owahle the muse tail 's iri rtdwb t groove may be dispensed with, the ball in this case onl engaging the cylindrical face of the tool s ank thereby preventing withdrawal of the tool from the retainer and at the same time allowing rotation thereof. It is also to be noted that the groove 9 or 9 in the tool need not necessarily be arcuate in a plane arallel to the longitudinal axis of the tool t is formbeing shown on account of greater ease of manufacture, the necessary characteristics of the groove being that the groove be arcuatein cross section on'a radius equal to the radiusof the ball so that when the ball-isseated in the groove the'tool is prevented from 'rotative movement. The

ottom of the groove may be parallel to the longitudinal axis of'the tool or at an angle thereto or arcuatein' form as shown, either formbeing adapted-tobe bindingly engaged by the spring pressed ball'in the retainer wallftopreveiit either rotation or longitudinal'movement of'thetoo'l. This-retainer may be a3ls0* use'd= with square shank tools and the arcuate groove dispensed with, the-square shanlr fitting in a' square: aperture in the r'etainer thereby preventing rotation of the tool in relation to tlie retainer and the ball' engagin one of the fiat-faces of the shank therekfy' preventing withdrawal of the tool from the ret'aine rf Theretainer may be 'niadein different sizeswith different central apertures as illustrated by the retainers 1 and 1- Fig: 1 in'the drawing-to'take-tools of varying sizes and types. "By. positioning the'ahgular aperturese and 4 shown in Fig.1 atopposite angles; the tendency of the die block'- to travel with the punch isprevented and the tendency of the punch to-remain in' the die block is also prevented by the 'twee'nthe wall of the angular apertureand the wall of the arcuate groove in the tool.-

Fromtheforegoi-ng description it becomes the mechanism here sliowmthepuiichhead 1% is held in position tioeitactly engage the aperture in thedie block'and thus a device is provided which is very efilc'ient and-exact a ,epeiaaen and which will we may get out-trader.

Having thus brieflydesciibed- (air memtiofii its utility and: niodeofoperation, what wecla'iin and desiieto' secure by Letters Patenti ofthe' United siiatesis Iijra? retainerfor: punches, dies" and simmermel s; a base, a supporting member rem'ovabw secured thereto and'llaving'a cenliy eie-suppbnfing nfreniber, tli*toolretainer hating I a central aplerture a spring-pressed emetainer and normaily seaoao extending into the aperture therein, the tool being adapted to fit in the aperture and seat against the base and having an arcuate groove of a radius greater than the radius of the ball in the face thereof in which the ball may engage to bind the tool in position.

2. In a retainer for punches, dies and similar tools, a base, a centrally apertured retainer detachably secured to the base, the

retainer also having anangular aperture opening thereinto, a spring-pressed ball in the said angular aperture, and a tool having a shank provided with an arcuate groove of a radius greater than the radius of the ball in the side thereof engaged by the ball when the shank is seated against the base in the said aperture of the retainer.

3. In a retainer for punches, dies and similar tools, a base, a centrally apertured retainer removably secured to the base, the tool'having a shank adapted for insertion in the aperture of the retainer, the retainer also having an aperture in the wall thereof extending at an angle to the longitudinal axis of the central aperture and opening thereinto, there also being an opening in the retainer extending from the angular aperture through the face of the retainer, a ball fitting within the angular aperture, a spring forcing theball to extend partially into the central aperture of the retainer, 'a recess formedin the surface of the tool shank having a face at an angle to the axis of the tool against which the ball engages when the shank is [seated against the base, the aperture extending' through the face of the retainer into engagement with the base permitting insertion of an instrument to withdraw the ball from enga ement with the tool.

4:. n a retainer for punches, dies and similar tools, a base, a supporting member having a central circular aperture counterbored at the inner end ad acent the base, means for detachably securing the supporting member on the base, a retainer having a portion engaging in the enlarged part of the supporting member and fitting the aperture of the supporting member, Said retainer having a central aperture and an aperture at an angle thereto opening into the central aperture, a spring-pressed ball in the angular aperture, and a tool having a notch formed in the face thereof engaged by the ball when the tool is positioned in the central aperture of the retainer and seated against the base.

5. In a tool retainer, :1 base, a centrally apertured retainer detachably secured to the base, the retainer also having an angular aperture openin into the central aperture, a spring-presse ball in the said angular aperture and a tool having a shank adapted for insertion in the central aperture to engage the base, said shank having an arcuate groove on one side only, said groove being arcuate in form both longitudinally and transversely of the axis of the shank, the groove tranversely of the shank being at its deepest part substantially of the same radius as the ball and longitudinally being formed on an arc of a ra ius greater than the radius of the ball.

6. In a retainer for punches, dies and similar tools, a base, a centrally apertured retainer secured to the base, the tool having a shank adapted for insertion 1n said aperture, the retainer also having an aperture in the Wall thereof extending at an angle to the longitudinal axis and opening into the central aperture, a spring-pressed ball in said aperture, and a tool having a shank pro vided with an arcuate groove' in one side thereof of a radius greater than the radius of the ball in which the said ball engages.

In testimony whereof we sign this speclfit' n. ca 10 CLEMENT C. RICHARD.

CLARENCE A. RICHARD. OTIS K, RICHARD.

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