US1576337A - Elbow-making machine - Google Patents

Elbow-making machine Download PDF

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US1576337A
US1576337A US30806A US3080625A US1576337A US 1576337 A US1576337 A US 1576337A US 30806 A US30806 A US 30806A US 3080625 A US3080625 A US 3080625A US 1576337 A US1576337 A US 1576337A
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tube
hammers
creasing
elbow
levers
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US30806A
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August D Kumpf
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August D Kumpf
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00Bending tubes using mandrels or the like
    • B21D9/14Wrinkle-bending, i.e. bending by corrugating

Description

March 9 1926. 1,576,313 7 A. D. KUMPF ELBOW MAKING MACHINE I Filed May 16, 1925 4 Sheets-Sheet 1 liIIIIIIII-IIIIIIIIIIHL by /lugust D. K10151 5 WITNESS: ATTORNEY March 9 1926. 1,576,337

A. D. KUMPF ELBOW MAKING MACHINE Filed May 16, 1925 4 Sheets-Sheet 2 Q W .2 J6

107 19 I I 62 J1 August .0. [fur up! INVENTO WITNESS: v ATTORNEY "March 9 1926. 1,576,337

A.D.KUMPF ELBOW MAKING MACHINE Filed May 16, 1925 4 Sheets-Sheet 5 gas 106 INVEN 0R August 17. Kum f March 9 1926.

1 A. D. KUMPF ELBOW MAKING MACHINE y 16, 1925 4 Sheets-Sheet 4 Patented Mar. 9, 1926;

UNITED STATES- PAT-ENT onrica.

AUGUSTD. KUMPF, or rnrnannnrnm, JPENNSYLVANiA.

ELBOW-MAKING MACHINE.

Applicationfiled Ma ie, 1925; Serial No. 30,806.

To all whom it may concern: I Be it known that I, Aoeusr D. KUMrr,

a citizen of the United States, residing 'at Philadelphia, in the county ofyPhiladelphia and State of Pennsylvania, have invented,

new and useful Improvements in Elbow Making Machines, of which the following is a specification.

ing of the succeeding rib which creasing or folding of the l'lbS results in the step by.

step 'areuate formation of the elbow and also to provide in a machine as specified, corri'igated hammers co-operating with a suit able mandrel for corrugating the tubular sheet metal in'nnediately after the creasing ofthe ribs.

Afurther object of the invention is to provide in a machine as specified, means for formin and cuttin -lockin ton ues through the overlapping edge portions of the sheet metal for locking-the sheet metal in tubular formation at the ends.

A further object of the invention is to provide in a machine asspeciiied, means for feeding the tubular sheet metal in step by step portion to the creasing means, which step by step motion controls through a pawl and release mechanism, the clutch structure, and arrests operation of the creasing means immediately after the forming of the last crease, permitting operation of the locking tongue pumping means, andthe corrugating hammers, thereby allowing the finishing of i the elbow on the single machine, and by a single operator. 1

A further object of the invention is to provide an improved machine over that disclosed in my Patent No. 1,439,559, issued December 19, 1922, which improvements-include among other things, the means for corrugating the elbows.

. Other objects of the invention will appear in the following detail description, and

in the accompanying drawings wherein .ing a pair of the forming machine having part oflthe porting structure broken away. I

Figure 3 is an end elevationof the improved elbow forming machine having parts thereof brokenaway.

Figure 1 is a fragmentary longitudinal section through the elbow formingmachine. Figure 5 is a fragmentary side elevation of a part of the elbow forming machine showing the clutch release mechanism Figure 6 is a detail section illustratcorrugating hammers used su pin the machine.

Figure 7-" is a fragmentary plan of a part ofthe corrugating hammer opera-ting structures as indicated by the line 77 of Figure 3.

Figure 8 is a front elevation of one of the creasing or ribbing members.

Figure 9+ isa side elevation of the creasing or ribbing members shown in Figure 8.

Figure 10 is a front elevation of the sec- 0nd creasing or ribbing member.

Figure 11- is a side elevation of the creasing-or ribbing member shown in Fig. 10.

Figure 12 is a view of the elbow showing it in different stages of completion.

Figure 1.3, is a detail section of the elbow showing the locking tongues.

Referring more particularly to the draw ings, the sheet metal from which the elbow is to'be'formed is first slipped over the cylindrical tube 1 through the circular slots 2 in the front plates 3 and fl, andits inner end is engaged in the annular groove which is formed in the block 6. The block (5 is carried by suitable carrier Twhich is slidably mounted upon the tube 1 and when the tube of sheetmetal from which the elbow is to be formed is first inserted through the circular slots 2 into the groove 5, the carrier 7 1s at the outer or forward end of" the machine, as clearly shown in Figure dot the drawings, and as the sheet metal tube is forced inwardly the carrier is moved rearwardly over the tube, carry ing with it the rack Swhich is-attached to the upper end of the carrier. The rack 8 has a plu'ality of relatively long ratchet teeth 9 formed upon its upper surface which co-operate with the pawl 10 in the forming otthe elbow. The pawl 10 is pivotally carried by a suitable carrier 11 and it has a latch pin 12 attached thereto which co-operates with spring operated latch bolt 13. The latch bolt 18 is a partofthe spring latch structure 14 which is approved construction. The pawl carrier 11 ispiv otally mounted, as shown at 15, to the supporting, structure-16, and is connected bylinks 17 to eccentrics 18 which are mounted upon the shaft 19. The shaft 19 *is' .of a tube of sheet metal, the pawl 10 is held in the upperposition, asshown in Figure 4 of the drawings, by the latch bolt 13 en-1 gaging the pin 12. After the tube has been forced rearwardly to the limit of its rearward movement, the pawl 10 is released by the head 20 of a set screw which is inserted,

in any one of the openings 21 in the rack 8. The position of theset screw 20 is merely regulated, depending upon the number of creases orridges to be put in the elbow. When the tube of sheet metal has been forcedto the hunt of Its. rearward movement, the clutch is thrown into operation in any approved manner, andthe tube creasing members or ridge forming members 2 1 and are rotated as hereinafter specified,

for forming the first crease in the tube and during the forming of this crease, the carrier member 11 moves rearwardly and the pawl 10 drops into position behind one ofthe straight shoulders of the teeth 9, as shown in Fig. 2 of the drawings, then after this first crease has been formed, the member,

11 moves forwardly, which moves the pawl 10 forwardly by the rotation of the eccentries 18 and this forward movement pushes. the carrier 7 forwardly the length of one of the teeth 9, and brings the sheet metal 2 into position for forming the second crease or ridge, as indicated at 23, and-12 of the drawings. hen the tubeis in position for the forming of the first crease, this crease is formed by the movement of the crease or ridge forming members 2% and 25. The members 24 and 25 are mounted at the forward'end of the tube 1 and are carried by pins 26 and 27, which are mounted on the end 28 of the tube 1 and are stationary. The member 2% which moves upward in an eccentric path. as clearly shownin dot-anddash lines in Fig. 8 of the drawings, is provided with a sliding block 29 which moves vertically in a suitable slot 30, and through,

which block the pin 26 extends. The creasing member 2& is provided with elongated slots 31 which incline outwardly from the central axis of the creasing member and through which the pins 27 extend.

An operating shaft carrying block 32 is mounted in a suitable opening 33 formed in the member 24, and which receives the shaft which is mounted eccentrically on the end of the shaft-135. The shaft 35 extends longitudinally through the tube 1 and is connected by means of the beveled gear 36 and the intermittent beveled gear 37, with the power shaft 19. The creasing member 25 is is provided-with a shaft receiving opening 38 through. which pin 26 extends, and with openings through which the pins 27 extend. A block 40 is slidably mounted in a rectangular openingt1 and it is provided with a shaft receiving opening through which the operating shaft 3 -1 extends. The pciimeters of the members 21 and 25 are 'l'lat throughout the major portion of their widths, as shown in Figures 9 and 11 of the drawings, to provide bearing faces 42 and they have creasing rims 48 on their perimeters which are beveled, as clearly shown in Figs. a, 9 and 11. lTVhen the tube of sheet metal has been moved forward one step, the members 2-1 and 25 are moved in their respectivepaths, which creases or ridges the sheet metal as indicated at hi in Fig. 12

of the drawings. Owing to the fact that the paths of movement ofthe members 24: and 25 are eccentric and that the rims tES are also eccentric, the ridges or grooves as are forn iedonly about aportion of the sheet metal tube, causing the t0pif the desired nrunber of creases or ridges have been formed, to assume the elbow shape.

Jrfterthe first crease or ridge has been formed, the timing of the machine is such that during the forming of the crease, the carrier 11 is moved backwith thepawl riding orer one of the teeth 9, and just as thecrease is completed, the pawl drops bchind the straight shoulder 45 ofthe next tooth- 9', and the forward movement. of the pawl again begins, which moves the tube forwardly another step, bringing it into position for the forming of the second crease or ridge 4-4:. As the tube is forced forwardly, the .substantially triangular shapeof the crease or ridge is mashed downwardly or flattened, as shown at 46, in 12 of the drawings, bytheforcing of the tube forn' ardly through the. circular slot 2; and againstthe innerwall of the front 8.

t will be noted that the inner surface'of the front 8 is slightly beveled, as shown at 1-6, to assist in this flattening or folding over of the ridge or crease. The various ridges or creases are formed subsequently,.and are subsequent creases or ridges,it is moved outwardly over the corrugated mandrel d7, which as clearly shown in Fig. t of the drawings, inclines upwardly to compensate for the curvature oi the elbow structure. However, the front plate 3 is pivotally mounted, as shown at 48, so that it may swing on the pivot-s slightly, as the tube is forced forwardly, it being releasedfor such forward swinging movement by the longitudinal moven'ient etthe rod 429, which is connected eccentrically to the shaft 19 by a suitable link 50. When the rod t9 moves forwardly, it rocks the stop 51 upon its pivot 52 and moves the set screw 53' out of engagement with the front '3 permitting this front to rock on the pivot 1-8 to provide a slight yielding movement as the tube is the stop lever 51 into position to prevent 7 rocking movement of the folding plate and brings the end of the tail 54; in the path of the inner edgeo-t the cam lever 56, and also brings the endofthe tail 59 of the corrugating hammer 60 in position for engagement by the inner edge of the lower cam lever 61. The cam levers 56 and 61 are connected by suitable cams 62 and 63 to a. shaft 6 1-, which is in turn connected by suitable worm gears 65 and 66 with the shaft he cams 62 and 63 are out so that when the hammer tails 54c and 59' are brought into position b01136 engaged by the inner edges of the cam levers and 61, resieetively, the levers will beroclred upon their pivot (3? to move the hammers and 60 inwardly towards the corrugated mandrel '-:li'.1"or (tori-ligating a section of the tube of which the elbow is being iii-ado. This operas 'tion is repeated in sequence to each creasing operation, as above specified, until all of the creases have been made in the tube after which the tube is removed. However, as the last crease in the tube is made, and the pawl 10 has operated the last active tooth 9 of the rack 8, the pawl 10 is raised into the position shown in Fig. of the drawings, by the cam hump 68 which is formed on the sliding bar 69 and engages the, roller 70 which is carried by the side of the pawl 10. The bar 69 is slidably mounted upon the side of the rack 8 .andis guided in its movement by suitable pins 71 riding in slots 7 It is urged in its forward position, asshown The in Fig. 2 of the drawings, by means of a spring 73 and it has an adjustable set screw 74: carried by its forward end which ongages the front t and moves the bar 69 rearwardly'to cause the cam hump 68 to engage the rollers 70 and move the cam upwardly into its inoperative position, in which position it is locked bythe latch bolt 13 and pin 12;

When the last crease is formed, the clutch lever '75 is thrown into ei'igagement with the clutch 22 by the engagement of the set screw 76 with rocking pawl 77. The set screw 76 is adjustably carried by an arm 78 which is in turn car'ied by the head 7, as clearly shown in Figs. 5 and 1 of the drawings. The rocking pawl 77 engages with a pawl which is keyed upon the shaft 80 upon which the clutch lever 75 is keyed. A spring 81 is connected to the clutch lever 75 when the pawl 77 is rocked and it is moved out of engagement with the pawl 70, the

lever 75 will drop into engagementw'th the clutch 22 and arrest rotation oi? the shaft 19.

or corrugating the ends ojt the elbow and for the purpose of forming tongues on the elbow.

After the elbow has been termed and corrugated inthe manner heretofore describedv the ends of the elbow will. be free from corrugations, and as is well known, in the formation of various types of elbows, one of the ends is larger than the other, so as to permit interlitting or the elbow with suit-- able lengths of pipe. The cam levers 5G and 61 are extended beyond the pivot 67 and have arcuate extensions 85 and 86 formed thereon. The extension 86 is provided with a slot 87 at its pivot through whiehrthe'me tension 85 extends, and each oirthe arms or extensions 85 and 86 have the tails and 89 oi eorrugatinghammers 00 and 91 respectively, pivoted tl'iereto. 'ihe tails 88 and 89 are pivoted so as to permit limiter rocking movement thereof, since the meeting edges of the hammers 90 and 91 are the "looking out at acute angles to the tails 8t and 89 respectively, as shown atSlEZ. 'llheinner sur face of the hammers 90. and 91 are corrugated, and co-operate with a mandrel 9;, which is also corrugated and is carried by a stationary arm 9 1. After the elbow has been removed from the machine, and of? the mandrel 27 and the locking tongues 101 stormed as hereinafter specified, the large end is mounted upon the mandrel 93 and themaehine is operated for a singlero-tation of the shaft 19 which'brings the hammers so that e rotation of the sl'iatt 19 and ill) 'and 91 together and corrugates the large end of the elbow in asingle operation.

It is necessary to chamfer one end of the lie and still corrugate the tube,the mandrel is provided which co-operates with the hammer or die 95. The hammer is attached to the lever 01, while the mandrel 9 1 is carried by a suitable carrier 96 attached to the supporting structure 97. The mandrel 9 is form-ed in a quarter section so as to corrugate only one-quarter of the circumference of the small end of the elbow and so gated,

If it is so desired, the arm 86 may be extended longer than the extension arm 85, as shown in Fig. 00f the drawings, so as to bring the hammer tails 88 and 89 on the same angle as the meeting eds 925 of the bosses 90 and 91, thereby eliminating the pivotal and rocking movement limiting structure as described in the preferred form of theinvention. The locking tongues and 101 by means of which the overlapping edges of the metal tube are locked together. are formed by the punch structures 102 and 103, one of which is right-hand and the other lefthand. These punch structures include the stationary punch carrying members 10 1 which have the punches 105 rigidly attached thereto. The punch carrying members 10% are cnciosed within tubular shells 106 which are yieldably mounted by means of springs 10?. A suitable supporting mandrel 108 is mounted rigidly wit reach of the cylindrical shells 106. A die member 109 provided for each of the punch structurcs, and the die 109 of the lower punch structure 103 is connected by means of a link 110 to an,

eccentric 111, which eccentric is in turn, connected to the shaft 64;. punch structure 10-1 is connected by means of a link 11 1 to the cam lever 56 and is operated by the movement of the cam lever. The tongues 100 and 101 are clamp-ed into the closed locking position by the hammers used in corrugating the elbow.

When it is desired to form a smooth or uncorrugated elbow, the hammers 55-60- 9091-94C and 95 are replaced by similar hammers, which have their inner perime'ters smooth and free from corrugations. other respects, the operation is the same.

tube to provide the smaller end and to do -1 or The die 109 of the In ailas follows The sheet metal is rolled vith its edges overlapping and the tube is forced through the circular slots 2 into the recesses 5 and the carrier 7 and rack S are forced rearwardly to their real-most position. The clutch lever 75 is then moved out of engagement with the ciutch 2:2 and the rotation of the shaft 19 will move the rack 8 and consequently, the tube forward in step-by-step manner, forming the various creases or ridges in the tube at the terminus of each forward step, and during the rearward movement ofthe pawl 10, into its position to again more the tube forwardly one step, the corrugating operation will take place. Simultaneously, with the forward movement of the. tube and carrier 7, the-crease or ridge which has just been formed, will be folded over in the manner as above specified, and it will then be hammered fiat and tight into position when it is engaged by the corrugating hammers. During the forming of the creases and the subsequent corrugating of the creased portions, only a part of the "elbow will be corrugated, leaving the ends smooth and these ends are first connected by formingthe locking tongues 100101 and are then corrugated, the large and small ends upon the mandrels 93 and 9% respectively, in the manner heretofore described, permitting the forming of a complete corrugated elbowon the single machine, and by a single operator.

It is, of course, to. be understood, that the invention may be constructed in various other manners and the parts associated in different relations, and therefore, I do not desire to be limited in any manner, except as set forth in the claims hereunto appended.

that I claim is:

1. In an elbowniaking machine, tube creasing means, corrugating hammers for eorrugating sections of the tube, tails on said hammers, cam levers for operating said hammers normally engaging said. tails,

means supporting said hammers to permit limited lateral movement of the hammers tomove them out of engagement with said levers. v I

2. In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in a step by step motion, a yieldably mounted front plate for holding over the creases, and means for corrugating sections of the creased. tube.

3-. In an elbow making machine, tube creasing means, corrugating hammers for cor- .rugatin-g sections of the tube, tails on said hammers cam levers for operating said hammers having edg-ewise engagement with the ends of said tails, and operating means for operating said cam levers and tube creasing means. I

Summing up'generically, the operation is I. In an elbow making machine, tube crea ing means, means for feeding a tube to said creasing means in step by step motion, corrugating hammers for corrugating sections of said tube subsequent to the creasing thereof tails on said hammers cam levers for operating said hammers having edgewise engagement with the ends of said tails, and means for operating said cam levers and tube creasing means.

5. In an elbow makingmachine,'tube creasing means, means for feeding a tube to said creasing means in a step by step motion, corrugating hammers for corrugating sections of said tube subsequent to the creasing thereof, tails on said hammers, cam

levers for operating said hammers having edge'wise engagement with the ends of the tails, means supporting said hammers to permit limited lateral movement of the hammers to move them out of engagement with said levers, and means for operating said levers and tube creasing means.

6. In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in step by step motion, a pivotally mounted front plate for folding over the formed creases, means for corrugating sections of the creased tube, and means for arresting operation of said step by step feeding means after the formation of the last crease in the tub-e.

7 In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in step by step motion, a pivotally mounted front'plate for holding over the formed creases,-and means for arresting operation of said step by step feeding means after the formation of the last crease in the tube.

8. In an elbow making machine, tube creasing means, a rack, a pawl cooperative with said rack for feeding a tube in step by step movement to said creasing means, a movable bar, a. cam hump on said bar for moving said pawl out of operative relation with said rack after formation of the last crease in the tube and a retracting spring connected to said movable bar.

9. In an elbow making machine, tube creasing means, a rack, a pawl cooperative with said rack for feeding a tube in step by step movement to said creasing means, a movable bar, a cam hump on said bar for moving said pawl out of operativerelation with said rack after formation of the last crease in the tube, and latch means for holdingsaid pawl out of operative relation with said rack.

10. In an elbow making machine, tube creasing means, a rack, a pawl co-operative with said rack for feeding a tube in step by step movementto said creasing means, a

- movable bar, a cam hump on said bar for moving s id pawl out of perative relation.

withsaid rack after formation of the lastv crease in the tube, a pivotally mounted front plate for folding over the formed creases, and means for eorrugating sections of the creased tube.

11. In an elbow making machine, tube creasing means, a rack, a pawl co-operative with said rack for feeding a tube in step by step movement to said creasing means, a movable bar, a cam hump on said bar for moving said pawl outv of operative relation with said rack after formation of the last crease in the tube, aretracting spring connected to said movable bar corrugating hammers for corrugating sections of said tube, cam levers for operating said hammers, and means for operating said cam levers. V

12. In an elbow making machine, tube creasing means, a ack,'a pawl cooperative with said rack for feeding a tube in step by step movement to said creasing means, a movable bar, a cam hump on'said bar for moving said pawl. out of operative relation with said rack after formation of the last crease in the tube, corrugating hammers for corrugatin-g sections of said tube, cam levers for operating said hammers, tails on said hammers, said cam levers having edgewise engagement with the ends of said tails. means for operating said cam levers, and means for arresting operation of said operating means after the formation of the last crease in the tube.

18. In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in step by step mo tion. a yieldably mounted front plate for folding over the formed creases, operating means for operating said tube feeding. and said tube creasing means, and means for disconnectingsaid operating means and said tube feeding and creasing means after formation of the last crease in the tube.

14-. In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in step by step motion, corrugating hammers, operating levers for said hammers, means for moving said hammers out. of operative relation with said levers at predetermined times, and means for returning said hammers to operative relation with said levers.

15. In an elbow making machine, the combination of stationary punches, movable dies, and yieldable supports for supporting the portion of the tube in position for engagement with said punch and dies.

16. In an elbow making machine, the combination of a plurality of corrugating hammers, means for operating said corrugatin-g hammers, a stationary punch and a movable die, and means connecting said die to certain of said corrugating hammer operating means for operating the die.

17. In an elbow making machine, the combination of a plurality of corrugating hammers, means for operating said corru ating hammers, a stationary punch an a movable die, means connecting said die to certain of said corrugating hammer operating means for operating the die, and yieldable supports for supporting a tube in cooperative relation with said punch and dies.

18. In an elbow making machine, a pair of movable corrugating hammers, operating levers for said hammers, means for moving said hammers out of operative relation with said levers at predetermined times, and means for returning said hammers to operative relation with said levers.

19.- In an elbow making machine, means for creasing a tube, corru-gating hammers for corrugating sections of the tube subsequent to the creasing thereof, actuating cam levers for operating said corrugating hammers, and extensions formed on said levers, and crossing each other, said extensions pivoted at their crossing point and corrugating hammers connected to said extentions.

20. In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in step by step motion. a pivot-ally mounted front plate for folding over the formed creases, means for arresting operation of said step bystep feed ing means after the formation of the last crease in the tube, corrugating hammers, operating levers for said hammers, means for moving said hammers out of operative relation with said levers at predetermined times, and means for returning said hammers to operative relation with said levers.

21. In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in a step by step motion, yieldably mounted means-for fol-ding over the creases, corrugating hammers, operating levers for said hammers, means for moving said hammers out of operative relation with said levers at predetermined times, and means for returning saidhammers to operative relation with said levers.

22; In an elbow making machine, means for creasing'a tube,'corrugating hammers for corrugat-ing sections of the tube subsequent to the. creasing thereof, actuating cam levers for operating said corrugating hammers, extensions formed on saidlevers and crossing each other, said extensions pivot-ed at their crossing point, corrugated hammers connected to said extensions remote from the pivots, means for moving said first named corrugated hammers out of operative relation with said cam levers at predetermined times. I

23. In an elbow making machine, a pivotally mounted plate, corrugating hammers slidably carried by said plate, operating levers for said hammers, means for rocking said pivoted plate to move said hammers out of operative relation with said levers at predetermined times.

24. In an elbow making machine, a pivotally mounted plate, corrugating hammers slidably carried by said plate, operating levers for said hammers, means for rocking said pivoted plate to move said hammers out of operative relation with said levers at predetermined times, and means for returning said plate and hammers to operative relation withsaid levers.

25. In an elbow making machine, a pivotally mounted plate, corrugating hammers slidably carried by said plate, operating levers for said hammers, means for rocking said pivoted plate to move said hammers out of operative relation with said levers at predetermined times, a support, said levers pivoted to said support, extensions on said levers projecting beyond said pivot, and tube end corrugating hammers carried by said extensions. 1

26. In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in step by step motion, means for folding over the form creases, a pivotally mounted plate, corrugating hammers slidably carried by said plate, operating levers for said hammers, means for moving said hammersout of-operative relation with said levers at predetermined times, and means for returning said hammers to operative relation with said levers.

27. In an elbow making machine, tube creasing means, means for feeding a tube to said creasing means in step by step motion, means for folding over the form creases, means for arresting operation of said step by step feed means after the formation of the last crease in the tube, a pivotally mounted'plate, corrugating hammers slidably carried by said plate, operating levers for said hammers, means for moving said hammers out of operative relation with said levers at predetermined times, and means for returning said hammersto operative relation with said levers.

In testimony whereof I afiix my signat ure,

- AUGUST D. KUMPF.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428764A (en) * 1944-01-22 1947-10-07 Crutcher Rolfs Cummings Compan Apparatus for cold bending of large diameter thin walled pipe
US20100170318A1 (en) * 2009-01-08 2010-07-08 Formtek, Inc. Elbow formation apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428764A (en) * 1944-01-22 1947-10-07 Crutcher Rolfs Cummings Compan Apparatus for cold bending of large diameter thin walled pipe
US20100170318A1 (en) * 2009-01-08 2010-07-08 Formtek, Inc. Elbow formation apparatus

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