US2393771A - Apparatus for riveting - Google Patents

Description

Jan. 29, 1946. A. J. HEINTZ 2,393,771

' APPARATUS FOR RIVETING Filed April 8, 1943 ALBERT l. HEINTZ INV NTOR Patented Jan. 29,1946

APPARATUS FOR mvn'rme Albert J. Heintz, Rochester, N. Y., assignor to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application April 8, 1943, Serial No. 482,271 3 Claims. (01. 78- 19) This invention relates to apparatus for rapidly riveting two spaced portions of work. One of the objects of my invention is to provide a machine which can be used for simultaneously fastening flanges on opposite ends of a spool core. Another object of my invention is to provide an anvil which is so constructed that it may return a blow delivered through the work to the anvil in such a manner that this blow may be utilized forriveting. Another object of my invention is to provide a machine which will simultaneously rivet. both flanges of a spool onto the spol core which will work at a high speed and which will produce uniform results. Still another object of my invention is to provide a method of riveting which will reduce the normal cost of such a riveting operation very materially. Other objects will appear from the following specification, the novel features being particularly pointed out in the claims at the end thereof.

Coming now to the drawing wherein like reference characters denote like parts throughout:

Fig. 1 is an enlarged sectional view through a riveting machine utilizing an anvil constructed in accordance with and embodying a preferred form of my invention;

Fig. 2 is a fragmentary view on a somewhat reduced scale of the anvil shown in Fig. 1 arranged to operate in conjunction with a high speed riveting hammer;

Fig. 3 is a fragmentary sectional View taken on line 3-3 of Fig. 6 of a typical riveted joint which can be made with my improved form of riveting mechanism;

Fig. 4 is a bottom plan view of a preferred type of riveting tool which may be used on either the riveting hammer or the anvil or both;

Fig. 5 is a top plan view of a spool before riveting; and

Fig. 6 is a fragmentary view on an enlarged scale showing a top plan view of one of the rivet heads.

It has been customary heretofore in manufacturing certain types of spools to provide lugs 0n the core which would project through closely fitting apertures in the spool flanges and then to rivet over these lugs or rivets to hold the flanges in place. The forming or riveting operation has usually been performed on a high speed hammer type of machine and it has been customary for one flange to be riveted in place after which the spool is turned over and the second flange is riveted into place. In accordance with my presentinvention both ends of the spool maybe riveted at once and I have been able to accomplish this without any change in the structure of the riveting hammer used.

While obviously I do not wish to be limited to any specific type of riveting hammer, I have found that the machines made by the High Speed Hammer Company, Inc., of Rochester, New York, can be used with my improved form of anvil to accomplish the double riveting operation. Such machines have proven very satisfactory in use.

Referring to Fig. 2, I have illustrated a high speed hammer I which consists broadly of an upright post 2 carrying a bracket '3 for supporting an anvil 4 on a table 5. The anvil may have a threaded connection at 6 with the table '5 to hold it in position.

In this instance the workpiece designated broadly as W may be a spool in which a core I provided on the ends with lugs 8 is used to support flanges 9. The flanges 9, as shown in Fig. 5, have openings l0 closely fitting the lugs 8 and the lugs extend slightly through the flange -9 as indicated in Figs. 1 and 2.

The post 2 supports a power drive'in unit l2 which may be operated by a belt l3 running over a pulley I4 on a shaft 15. The shaft l5 carries an eccentric or cam l5a seated in a strap IE on the lower end of a rod [1. This rod carries resilient buffers I Band l9 that serve to cushion the rapid oscillations of the rod l1 and to transmit these oscillations by means of a transverse pin I8a between the buffers, this pin being seated in arms 20 pivoted at 2| in the frame.

The arm 20 carries a wooden lever 22 as by being bolted at 23 thereto and the Wooden arm is preferably made of some strong resilient wood such as hickory. On the outer end of this arm there is a strap 24 to which a shaft 25 is attached. This shaft will, therefore, move axially as the arm 22 moves so that the hammer 26 will deliver a series of sharp, rapid blows, the length of a stroke of which is determined by the cam l5a selected for the particular job.

Not only does the shaft 25 move axially, but it is turned through a worm gear 28, worm 29, pulley 30 and belt 3| which engages a pulley 32 in the power driven unit. The worm gear 28 is held in mesh with the worm 29 and the shaft 25 may slide through the worm gear on a suitable spline 33.

The high speed hammer described above may be of any known type but is preferably one made by the High Speed Hammer Company, Inc., above referred to except for the shaped the hammer too126. 1

This hammer tool 26 is preferably provided with a circular-shaped head 35 having teeth 36 as shown in Fig. 4. The position of these teeth is such that one or more teeth will always contact with the lugs 8 of the spool core when the work W is positioned for the riveting operation. Moreover, as the hammering tool moves at very high speed axially, andfiasit isslowly; turned. as.it.ham.-- mers, it provides a series of light, firm strokes. which flatten out the lugs 8 from the condition shown in Fig. 5 to the condition shown in Fig. 6-. wherein the lugs have been flattened over as indicated at 8. This operation takes place very rapidly and with my improved form. of anvil 4,, which will now be described, a similarriveting operation simultaneously takes place on the 0pm site end of the workpiece W. g V I As indicated in Fig. 1 the lbwer" spool flange 9 is provided with the openings l0 through. which the lugs 8 pass. In other words, this end of the spool; is exactly theisameras the first-describedend: My improved: anvil: 4', includes a riveting tool 40 which, like the. riveting: hammer" isprovid'ed; a seriest'of: serrations or teeth 4i 7 arranged in: annular: form, but this riveting tool" differs; fromthee hammer that it" is pro videdi witha an annular flange 43: adapted to-en-- gage arr overhanging. flange: 4'4: of theannular cap fi in such a manner that the tool 40 may slide-r relative. to: its support through a distance not greater: than the widtli of theeslot ii-between the riveting -tool and the tubular" Support 47'. The riveting tool)- has: a central andf downwardly projecting post"- 48 encircled Icy-one endiofasub stantial' 'spring 49; the other end' of which; 50; rests on the threaded cap 51 holding the base of thertubulan support 41 to the shelf or-rest' 5 bymeansof a threadedconnection at li-witlithe end of the 'bra cket'i improved anvil: 4 not only supports the. work. W in: position forth'e' upper: end: of theworls tonbe. riveted, butit; likewise= supports andrivets the lower end of the work at the sametimei action: takesplace since" the anvil returns theiblow struck'ag-ainst the= workby: the hammer Katma this: reboundcauses-the riveting teeth' ,4 l' torivet: the lugs ll in: the same manner that the riveting teeth 36 of the hammer rivets-the opposite end of tliework. v Each time the' hammer 35: strikes the tubular-core 'fi'bycontactlng 'with tIie upper-lugs: 8, the=lewer lugs aredriven down against the riveting tool 4'0" and the spring 49 is compressed andas soon as the Hammer 35* rises, the riveting: tool- 4'0 rises-and the bl'ows' thus stiruok simultaneously rivetbotli ends of the wcrk at' oncea Theoperation' takes place with a high degree of rapidity and" by controlling the operation of the; machine thedegree of riveting or-the=degree'- of 'de-formihg wliichcan bma-pplied to" the lugs B can bevery readilycontrolled. It" is possible to make=tliese lugs only-'slightly longer than the thicknesg of thefianges and todefornrthem very slightly, orit is possible todeform'the lug-s as indicat'ed 'im Fig: G to a; much larger degree and to form" them over quite-a substantial portion 'of the flanges 9 sliouldthis be= desired.

By my improvedmethod I utilize the blowsstruek by the ri'vetinghamer to not only" rivet the=upper li1gs; but to cause the rebound" of the" anvil to perform a similar riveting operation of tlielbwer-set-oflhgsz This method not only cuts down= the usual time of riveting" such work by half; sincl. it does the two' 'operatitms at once; but 111+ addition it insures that 50th of the rivet ing operations will be carried to a like extent' in completing the work. It is of course possible to obtain difierential results riveting more at the top than at the bottom or vice versa, should this become necessary. This can be done in a number of ways, one of the simplest of which is to vary the space 46 and consequently the amount which the riveting tool may move. way, is, to unscrew the. collar .45. and insert a spring t9 of diiierent'; power from the. spring previously used as by making the sprin more or. less powerful the degree of riveting can be varied.

It i's-quitelobvious that difierent types of mechanismsmay be employed for operating the rivetm hammer. as. any desired mechanism whether 1 working. atxa high. speed or not could [be used for this part of the operation. However, as above explained} apreferred type of machine may includek-nown types of high speed riveting hammers. With a machine of the type. above described; the duo: riveting operationeamnotionly be carried. outzwith a.highi degree: of but: the riveting: can occurevery rapidly-and. ma'cl1ine=can:-.r.eadil-.ybe $02 set; that, aslso'oirxas the. riveting islcarri'ed on: to therdesi-redi extent.

fur-theroperation. of the machine will not. alfect'i therivetedijointi already made: I

I claim: a 1 1i: In: a: riveting machine of type-:1 includiingza, rivetingv hammer; powerme'azns forrapidly reciprocating: the riveting hammer and means:

for turning the. hammer: as; it-isareciprocated the: combination: with saict hammeiz. of an anvil; spaced: from and in alignment; with: said l'ialrrimet, theanvil being positioned for' supporting: workto be riveted: at. botlr ends, and: comprisinga supportra spring ins-idevorthee support, airivets-= ing tooli mounted: on: the support? for limitedi movement; relative thereto means; for. limiting; movement of the riveting: tool relativeato: said: support; the: spring: bearing: against. and; holding a the rivetingtool againstisaid means for limiting:

movement; of the riveting J t'oiol' and: towards: the rivetin hammer; whereby both said: riveting; hammer and said: riveting tool may strike their: respective ends of work placedtherebetween .the hammer striking direct. blows: upon'the work causingthe work tostoreup" and release energy inthe: spring thereby causing"- the-r-iveting tmrl' of the anvil to strike blows on: the? end? of the work. spaced from: the riveting hammer.

22 A; machinefor simultaneously rivetingspaced ends of work comprising ahigh-speed hammer, a riveting tool having spaced-teeth car r-ied by the hammer; an anvil" mounted; beneath the hammer, amovably' mounted" riveting" tool carried by the anvil and having spaced teeth;

s'a-idiriveting tool beingspa'cewfrom thefirst mentioned rivetin tool and being in axialialignm'ent': therewith to: receiveiworln therebetween amount for: said. last: mentioned. riveting tool: in; which; the riveting tool may move a limited distance. a spring tendingito-holdtthe lastimentionediriveting. tool 5 toward: the. first. mentionedrivetingl tool; whereby. theblows struck bythe? hammer upon the: first. mentioned.- riveting tool may.- cause: the springv to, move the second. mentioned, riveting; tool sothat-both-ends of the work: between. the: hammenandanvilmay be riveted by the action. of V the. two. axially alined. riveting tools upon the: work.

3. Ananvil for high. speed riveting. hammers of the typev including a powerdrivenhammer; a first riveting tb'olcarried' thereby andfoscillat? able by the hammer to deliver a plurality of Another rapid blows upon work, said anvil including a second riveting tool shaped like the first and positioned to support work beneath the hammer and the first riveting tool, said first and second rivetin tools normally having a fixed relationship, a carrier on which the second riveting tool is slida-bly mounted, flanges on the second riveting tool and carrier, a spring normally holding said flanges in engagement, said hammer and first riveting tool being adapted to strike work carried on the anvil beneath the hammer and cause the flanges to separate, said spring returning the flanges to their normal contacting position, and means for adjusting the movement of the second riveting hammer relative to the first rivetin hammer comprising a threaded connection between one flange and the carrier for limiting the stroke of thesecond. riveting hammer carried by the anvil.

ALBERT J. HEINTZ.

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