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Publication numberUS2726702 A
Publication typeGrant
Publication dateDec 13, 1955
Filing dateMar 2, 1951
Priority dateMar 2, 1951
Publication numberUS 2726702 A, US 2726702A, US-A-2726702, US2726702 A, US2726702A
InventorsEd Laxo
Original AssigneeEd Laxo
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hook forming machine
US 2726702 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

DEC. 13, E LAXO HOOK FORMING MACHINE 3 Sheets-Sheet 1 Filed March 2, 1951 INVENTOR. [0 141m Dec. 13, E, XO

HOOK FORMING MACHINE 3 Sheets-Sheet 2 Filed March 2, 1951 INVENTOR. [0 [4X0 BY 2 '2 Dec. 13, 1955 LAXO 2,726,702

HOOK FORMING MACHINE Filed March 2, 1951 3 Sheets-Sheet 3 I N V EN TOR. [0 [4X0 United States Patent HOOK FORMING MACHINE Ed Laxo, Oakland, Calif.

Application March 2, 1951, Serial No. 213,581

1 Claim. (Cl. 153-11) This invention relates to a hook forming machine for forming hooks on can body blanks.

In forming hooks on can body blanks, i. e., hooks which are employed to form the side seams of can bodies, it is essential that the hooks be formed accurately and at a high speed. Accuracy is essential because, otherwise, faulty side seams will result. High speed is essential because of competitive conditions prevailing in the can industry.

It is an object of the present invention to provide an improved hook forming machine for forming hooks on can body blanks.

Yet another object of the invention is to provide a machine capable of forming hooks on can body blanks at a high speed.

Another object of the invention is to provide a machine capable of forming books on can body blanks with great accuracy and at high speed.

Still another object of the invention is to provide a hook forming machine of the character for the purpose described having a simplified construction.

Another object of the invention is to provide a hook forming machine of the character and for the purpose described which is easily adjustable.

Yet another object is to provide a hook forming machine of the character and for the purpose described which is easily timed, and in which the timing of the several elements of the machine with respect to each other, and of the machine as a whole with respect to other elements of a can body maker line, is facilitated by the provision of a common drive from a single crankshaft.

Yet another object of the invention is to provide a machine having some or all of the advantageous features described herein and which is generally useful for the purpose of bending sheet metal objects and the like.

These and other objects of the invention will be apparent from the ensuing description and the appended claims.

One form of the invention is illustrated by way of example in the accompanying drawings and is described hereinafter.

, Referring to the drawings:

Figure 1 is a view, partly in end elevation and'partly in transverse section, of both the left and right-hand hook forming assemblies of a hook forming machine constructed in accordance with the invention.

Figure 2 is a fragmentary view similar to that of Figure 1 but on a larger scale and in which certain of the parts shown in Figure l are omitted. In Figure 2 the machine is shown at a different stage of operation thanillustrated in Figure 1. 3

Figure 3 is similar to Figure 2, but illustrates the machine at a later stage in the operating cycle.

Figure 4 is a top view of the right-hand assembly of Figure 2. i


and the ensuing description will be confined, for the most part, to the right-hand assembly 11b. Each assembly is mounted on frame members 12, the spacing of which may be adjusted by any suitable means (not shown) for can body blanks of difierent lengths.

The assemblies 11a and 11b have common drive in the form of a single crankshaft 13, which may also be employed to operate a notching machine in advance of the hook forming machine, and also to operate a can body maker for interlocking the hooks formed by the machine of Figure l and forming side seams therefrom.

For example, the crankshaft 13 may be employed to operate the notching machine described and claimed in my co-pending application Serial No. 213,582, filed March 2, 1951, entitled Notching Machine, now U. S. Patent No. 2,695,061, granted November 23, 1954,. and the body maker described and claimed in my co-pending application Serial No. 165,617, filed June 2, 1950, entitled Can Body Maker, now U. S. Patent No. 2,656,806, granted October 27, 1953.

As illustrated, the crankshaft 13 is provided with an eccentric 14 on which is rotatably mounted a split strap 14a whose parts are clamped together by means of cap screws 15. One half of the strap 14a is integral with one end of a connecting rod 16, the other end of which is rotatably connected at 16a to a rocker 17. The rocker 17 is rotatably mounted on a rocker shaft 18 which provides a fulcrum for the rocker. The right-hand end or arm of the rocker 17 is rotatably connected at 25 to the lower end of an adjustable connecting rod 26, the upper end of which is rotatably connected to a shaft 27.

The left-hand end or arm of the rocker 17 is similarly,

connected to an adjustable connecting rod 26 which is similarly connected to a shaft 27.

Referring to Figures 1 and 2, it will be seen that can body blanks such as the blank shown at 28 are carried by a feed table 29 along which they are conveyed by any suitable means (not shown), such as reciprocating dogs. The blanks 28 are registered at the hook forming station by suitable registering means such as shown at 30. The registry means 30 are not shown in detail, and

any of several known types of registry means may be used.

Referring to Figures 2 and 3, it will be seen that each.

body blank 28 protrudes beyond the edges of the feed table 29 and that the protruding edges are'formed'int'o hooks-in two stages.

as shown at 31 in Figure 2 and then a hook is formed which, as shown at 32 in Figure 3, forms an acute angle with the plane of the body blank. Preferably this angle is about 30, but the precise angle may be varied.

The means for accomplishing this hook formation will now be described in detail. Referring more particularly to Figures 2 and 7, it will be seen that a U-shaped link 33 is provided having arms 34 which are rotatably First a right angular hook is formedf a 'valtoftime.

1 1 eyzepoa hookforming machine and other associated machines p can hereadily adjusted by looseningithe screw :52,- shifting ithe .eam :51andxthen tightening the screw .52 when suitableadjustmenthas been made.

"131: mm 51 :is formed at its upper end with a low dwell-54,.azrisefi5 and aihighsdwell56. It is in engage- 1 mentwitha roller-.57 which isirotatable on an extension 58 of one branch or amnSQofaU-shaped lever 60. The

Iever160 is shown in'elesiation iniFigure 2 audio .top plan inrFigurel. The arms59 ,ofithe lever .60 are rotatable on stub shafts 165 which are clamped to frame members 66 bycap screws .67.. Theinner orleft-hand end of the lever 60,;as viewedin Figure 2, is formedwith a clamping head 68 which carries -a yieldable clamping member '69 which keyed intoa recess 69a formed .in the clamping head and is urged downwardly by an expansion spring 70. Aisofixed to the-clamping .head'and forming a partthereof is-a forming diefl7r1 havinga lip 72. The lip 72 is formed at the angle towhichzit is adesired to .bend the can body hooksttfor example, in :the preferred embodiment, it is formed at anangle of It be apparent that, as the crankshaft 13 rotates and rocks the rocker 17, the cam 51 will oscillate about the axisof its shaft 36 and that the action thereof 'on the roller 57 will'rock or oscillate the :lever 60. It will, therefore, be apparent that the clamping head :63 will alternately descend, clamp a body blank28 to the feed table .29 for the 'hookforming operation and thenascend to release :the body blank .for forward :travel, e. g, to a can body maker. The yieldable clamping member 69 will clamp each body blank to :the feed table :prior to the end of the down stroke of the clamping head and will serve to hold the body -lankinposition during this inter- .The shaft 27 also rotatably carries arms 80 which are integral at their upper .ends with a steel holder .or head 81. A hook forming steel or die 82 having 'a-plane, vertical face 82a is keyed into a dovetailrecess :83 formed in the head 31 and a is formed with'adip .84:which is coopalso guided for ,vertical movement from the-position shown in Figural to the position shown .in Figure 2, that is, until the'hookfonning lips 72 and Mareinthe samehor'izontal plane, hy,guide meansincluding a tension spring :88 which is connectedat one end to a pin 89 fixed tothe head 81 During the initial part of its up w of a completeibody maker line "is facilitated, and {the and at its other .end .to a pin 90 fixed to a bracket 91.

It will be apparent that the to that shown in Figure 3 the action of the rise '94 against the roller 92 will rock the .head 81, and with it the steel 82 and the lip 84 in counterclockwise direction as viewed in Figure 3. It will, therefore, be apparent that, during the initial stage of the up stroke of the head 81 and the steel or die 82, the latter'will move vertically and will bend the protruding end of -a can body blank at'a right angle as'shown in Figure 2. -It will also be apparent that during the remainder of the upstroke, i. e., while moving from the position shown in Figure 210 that shown in Figure 3, the steel or .die '82 will be rocked to bend the right angle hook to a sharp angle.

The ,cam 93 'is adjustable 'vert-icallyby the means which will now be described in .detail. Referring'to Figures 2, 4 and 6, the cam 93 is keyed into a dovetail, longitudinal slot 96 formed in the head 81. A bracket 100 is fixed to the upper end of the cam 93 by a cap screw 101 and it is formed at its inner or left-hand, as viewed in Figure 2, with a -U shaped recess 102 to receive .a shoulder :screw 102a which is threaded into the headJSl as shown .at 103'. in Figure 2. ltwillbe apparentthat, by .turningthescreW 10211 the .cam 93 will be raised or lowered in its slot 95; When suitably adjusted, the cam 93 is clamped in adjusted position :bysneans of .a .gib 1'04 and caps-screws 105..

in operation, and referring only .to "the right-hand assembly .1111, as the crankshaft 13 rotates, the connecting rod 26 will reciprocate, thereby causing through the medium of thelink33, the cam .51 and the ileverfill,

the clamping head 68 ,to alternately clamp body blanks to the feed table and release them for'forward movement to a body maker.

loosening the screw 52, shifting the cam 51 relativelyto its :snpporftingarm 49 and then tightening the screw 52.

Simultaneously with the operation of the clamping head 68, the head 81 and with it the hook forming steel '82. are reciprocated' to bend the protruding edge of :a body blank,firstito a right angle as shown in Figure 2 and then I to an angle of 30 as shown in :Figure 3 to form a finished hook. Timing of this operation is readily accomplished by loosening screws 105 in gib 104, turning the shoulder screw 102a and'then tightening the screws 105 when suit-. able adjustment has been made. On the down stroke,

of course, the spring 8 will return the head 81 to the a preciselytimed relation by means of a single crankshaft and a single rocker. Since this same crankshaft mayfhe usedfor-otherelements of a can body maker line, such as a notching machine and a body maker, precise timing number of .moving parts is greatly reduced.

Timing of the, several elements of the machine, for

example, of the can body clamping :means'and-o'f the hook .forming steel or die, .is easily and speedily accomplished by .the means described hereina-bove. Asa whole the machine of myin-vention is simple, is easily adjusted:

and it is easily repaired. Interchange or replacement of parts is easily and speedilyaccomplished, The machine is capable of high speed, dependable operation and-itforms hooks with great accuracy. vSlides are unnecessary for guiding the forming tools, which prevents ,gallingand 7 other tlifiicu'lties inherent in slide 7 structures.

I claim:

A can bodyho'ok *formingmachine comprising.arstationary frame, a horizontal table fixed to said frame for supporting a canbody blank thereon with an edge of the.

blank projecting beyond an edge of said table, a pa'ir'of Timing of this operation is readily accomplished by adjustment of :the cam :51, i. e., by-

parallel generally horizontally disposed levers pivoted to said frame for oscillatory movement about a first horizontal axis parallel to said edge of said table, a pair of generally vertically disposed arms pivotally mounted at one end on free ends of said levers for pivotal movement about a second horizontal axis parallel to said edge of said table, a hook forming tool secured to the free ends of said arms, said tool having a flat vertical surface facing said edge of said table and arranged to engage the projecting edge of the body blank, said tool having a lip at one end of said flat vertical surface, a roller secured to said frame and rotatable about an axis parallel to said edge of said table, cam means fixed to said arms, spring means resiliently urging said cam means into engagement with said roller, said cam means having a vertical dwell portion causing said tool to partake of an increment of vertical movement upon oscillation of said levers, such increment of vertical movement causing said fiat vertical surface of said tool to slide vertically relative to the projecting edge of the blank and subsequently causing said lip to engage and bend such projecting edge 6 to substantially a 90 angle to the blank, and said cam means having a rise portion causing said tool to rock toward said edge of said table after such 90 angle has been formed in the blank to thereby cause said lip to effect an acute angle fold in the blank.

References Cited in the file of this patent UNITED STATES PATENTS 131,940 Courtright Oct. 8, 1872 273,982 Goodwin Mar. 13, 1883 686,866 Stevenson Nov. 19, 1901 799,409 Slaysman Sept. 12, 1905 826,807 Slaysman July 24, 1906 843,100 Richards Feb. 5, 1907 997,021 Stevenson July ,4, 1911 1,055,973 Graham Mar. 11, 1913 1.764,318 Kruse June 17, 1930 2,386,706 Moessinger Oct. 9, 1945 2,569,181 Laxo Sept. 25, 1951

Patent Citations
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US799409 *Jan 25, 1904Sep 12, 1905Alexander Slaysman JrMachine for forming the side seams of sheet-metal bodies.
US826807 *Apr 21, 1906Jul 24, 1906Alexander Slaysman JrMachine for edging sheet-metal blanks.
US843100 *May 27, 1905Feb 5, 1907Francis H RichardsCandy-working machine.
US997021 *Jun 27, 1910Jul 4, 1911William H H StevensonCan-body forming, locking, and soldering machine.
US1055973 *Jan 28, 1910Mar 11, 1913Charles W GrahamEdge-forming mechanism for can-body blanks.
US1764318 *May 21, 1927Jun 17, 1930Bliss E W CoMarginal hook-forming mechanism for can-body-making machines
US2386706 *Mar 15, 1943Oct 9, 1945Sulzer AgCentral safety device
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2847051 *Mar 19, 1957Aug 12, 1958Nat Can CorpEdger means for bending the edge of a can blank
US2973796 *Jun 26, 1959Mar 7, 1961Engel Sheet Metal Equipment InCleat flanger for sheet metal ducts and the like
US3054437 *Jan 29, 1960Sep 18, 1962Laxo EdCan body blank forming machine
US3058512 *Feb 20, 1957Oct 16, 1962Continental Can CoBody blank flanging mechanism
US4383430 *Dec 19, 1980May 17, 1983Rolf PeddinghausBending machine
US4453396 *Sep 15, 1982Jun 12, 1984Suehiro TakatsuHemming apparatus
US4455857 *Sep 27, 1982Jun 26, 1984Salvagnini Transferica S.P.A.Forming press for bending a blank
US4497196 *Feb 7, 1983Feb 5, 1985Amp IncorporatedApparatus for performing operations on strip material
US4706489 *Dec 5, 1985Nov 17, 1987Utica Enterprises, IncorporatedSingle station hemming tooling
US4827595 *Jul 31, 1986May 9, 1989Utica Engineering CompanyMethod for hemming overlapped sheet material
US4928388 *Mar 1, 1989May 29, 1990Utica Enterprises, Inc.Single station hemming tooling
US5647243 *Feb 1, 1996Jul 15, 1997Comau S.P.A.Device for hemming elements of pressed sheet metal
US5711183 *Mar 23, 1995Jan 27, 1998Ab VolvoDevice in a bending unit
US5746086 *Dec 22, 1994May 5, 1998Ab VolvoDriving device with force-limiting element for a bending unit
U.S. Classification72/315
International ClassificationB21D51/28, B21D51/26
Cooperative ClassificationB21D51/28
European ClassificationB21D51/28