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Publication numberUS2618840 A
Publication typeGrant
Publication dateNov 25, 1952
Filing dateJun 9, 1948
Priority dateJun 9, 1948
Publication numberUS 2618840 A, US 2618840A, US-A-2618840, US2618840 A, US2618840A
InventorsGeorge I Danly, Georgeff Vasil
Original AssigneeDanly Mach Specialties Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Feed for power presses
US 2618840 A
Abstract  available in
Images(4)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Nov. 25, 1952 G. 1. DANLY Erm.

FEED FOR POWER lPRESSES 4 sheets-sheet 1 Y Filed June 9. 1948 y INVENTORS GEORGE DHA/Y BY Mfrs/L GEOEGEFF 1C) 7" TOE/VE Y Nov. 25, 1952 G. l. DANLY ET AL 2,613,840

FEED FOR POWER PRESSES Filed June 9, 194s 4 sheets-sheet 2 f INVENToRs f4 TTOIQNE Y NOV. 25, 1952 1 G, DANLY ETAL 2,618,840

FEED F'OR POWER PRESSES Filed June 9, 1948 4 Sheets-Sheet 3 S M Lk;

4 Sheets-Sheet 4 YF n M THQA O n mI/Sn E tu v V.. w B

Nov. 25, 1952 G. l. DANLY ETAL FEED FOR POWER PRESSES Filed June 9. 1948 mute nsum. E

Patented Nov. 25, 1952 UNITED STATES PATENT CFFICE FEED FOR POWER PRESSES nois Application fune 9, 1948, Serial No. 31,984

(Cl. :Z9-33) 14 Claims. l

Our invention relates to a feed for power presses and more particularly to an assembly in combination with a power press for carrying the feed rolls up and down with the stock when drawing or forming operations are such that it is necessary to raise the stock to clear the die cavities before it is possible to feed the stock to the next operation.

Many objects are formed on power presses by means of progressive dies requiring successive steps in which a plurality of stations are provided in a die or dies such that the stock is moved from station to station in successive steps.

At each station, one operation is performed. so that at the final station the complete object, having the desired form and shape, is finally achieved. In operations of this character, the dies are frequently provided with re-entrant portions and it becomes a difficult matter to feed the stock from station to station. In operations requiring the raising and lowering of the stock, die designers make dies for separate operations, each to be conducted in a different press. Stock is fed by hand and transferred from press to press, either on conveyors or by hand, and fed to succeeding presses by hand. Our invention permits such operations to be performed on progressive dies, using oiled stock, thus saving machinery,

conveyor equipment, man power and space.

One object of our invention is to provide a power press in which progressive dies formed with lre-entrant portions may be fed with stock automatically by a double roll feed.

Another object f our invention is to provide an improved power press having a roll feed in which the feed rolls are carried up and down in a predetermined phased relation when drawing or forming operations are such that it is necessary to raise the stock to clear the die cavities before it is possible to feed the stock to the next operation.

Another object of our invention is to provide an improved power press assembly having a roll feed in which the feed rolls are reciprocated in a predetermined timed relation to the operation of a press ram and with the working of the die and the lift-out mechanism.

Another object of our invention is to provide a power press having feed rolls moving up and down in a predetermined timed relation and provided with a scrap cutter whose operation is timed with the press ram and the feed roll and lift-out movement in such manner as to provide a continuous feeding of the stock.

Other and further objects of our invention will appear from the following description.

In general our invention contemplates the provision of a framework adapted. to reciprocate on the press frame independently of the press ram. The framework carries a pair of feed rolls. Driving means are provided for reciprocating the framework in timed relation to the movement of the press ram such that the stock will occupy one level clear of the die cavities during feeding and will be in position for the forming or a drawing operation during the working stroke of the ram. The framework carrying the feed rolls is adapted to operate the lift-out pins in the dies.

In combination with the above, we may provide if desired a scrap cutter which moves up and down agreeable to the movement of the stock which may be operated by an eccentric in pre determined timed relation or which may be operated by the motion of the reciprocating lift-out framework.

In the accompanying drawings which form part of the instant specification and which are to be read in conjunction therewith and in which like reference numerals are used to indicate like parts in the various views:

Figure 1 is an elevation of the press with a typical die in section showing one embodiment of our invention;

Figure 2 is a side elevation taken along the line 2 2 of Figure l showing a scrap cutter having a full width blade;

Figure 3 is a fragmentary elevation taken along the line 3 3 of Figure 2, with parts in section, showing the scrap cutter drive;

Figure l is a side elevation similar to Figure 2 showing a scrap cutter of a different type 0perated by the motion of the lower lift-out relative to the press frame;

Figure 5 is a fragmentary view taken along the line -S vof Figure l showing details of the scrap cutter drive shown in Figure 4;

Figure 6 is a timing diagram showing the cycle of operations of the press ram, the scrap cutter of the form shown in Figure 2 and the lower liftout beam; that is the framework carrying the feed rolls.

More particularly, referring now to the drawings, a press frame indicated generally by the reference numeral iii supports a crown E2 on which is supported a prime mover such as an electric motor ifi. The motor ill drives a flywheel !6 through a plurality 0f V-belts i8 or in any other appropriate manner. The flywheel is adapted to be clutched to and unclutched from a main driving pinion 20 as is well known in the art. The pinion 20 drives a gear wheel 22 which meshes with a gear wheel 24. The gear wheel 22 drives a pinion 2S while the gear wheel 24 drives the pinion 28. The pinion 26 drivingly meshes an eccentric gear 30 while the pinion 28 drives an eccentric gear 32. The eccentrics are connected to a, slide 34 through pitmans (not shown) as is well known in the power press art so that the slide is adapted to reciprocate in predetermined timed relation, usually with simple harmonic motion.

The slide 34 carries a slide bolster 36. The bed of the press 38 is provided with a bed bolster 40.

In Figure 1, a six-station die is shown in which there are provided a plurality of die cushions in the slide. In the drawing, an upper lancing die 42 is positioned between the first station which is idle and the second station which is idle and is provided with a die cushion 44 for stripping of stock.v At vthe third station, the upper drawing die 4G is provided with a die cushion 48 to act as a blank holder. At the fourth station,.an upper piercing die 50 is provided with a die cushion 52 for stripping of stock. At the fth station, an upper redrawing die 54 is provided with a die cushion 56. At the sixth station, an upper trimming die 58 is provided with a die cushion 60. On the bed bolster 40, a lower die, or dies, is positioned upon the bed bolster 40 for cooperation with the corresponding and co-acting upper dies.

A pair of gear boxes 62 and 64 are carried by the crown of the press. A gear 66 meshes with eccentric gear 30 for rotation thereby and a gear 68 is rotatedV from eccentric gear 32. A gear 'I0 is housed within the gear box S2 and meshes with a pinion I2 driven by gear 66. A pinion '4 is adapted to rotate with gear 68 and meshes with gear 15 housed Within gear box 64. The power ranges are such that the shaft Tl, carrying the cam T8, will rotate at the same speed as the gear 3! and the cam 80 will rotate at the same speed as the gear 32. A pair of cams 'i8 are adapted to be driven by the rotation of gear 10. A pair of cams 80 are adapted to be driven through gear 16. A pair of levers 82 are pivotally secured to a pair of lugs 84 carried by the press crown. A pair of lever 36 are pivotally secured to lug 88 secured to the crown of the press |2. The ends of levers 82 are bifurcated and pivotally connected to a pair of supporting rods 90, the lower ends of which are pivotally secured to lugs S2 carried by a feed roll-supporting framework 94. The lever 82 are provided with a pair of cam followers 96 engaging respective cams '13. The arrangement is such that the rotation of cams 13 will move the roll-supporting framework 94 up and down with a motion depending upon the shape of the cam. The cams 'I8 are secured to a shaft TI for rotation therewith. The shaft TI operates a Shaper motion lodged within housing S adapted to reciprocate member 99 to which a rack |00 is connected, rotating a drive pinion secured to a shaft |02 adapted through intermeshing bevel gears to rotate the drive shaft |04 through an overrunning clutch as is well known to the art. The rotation of the drive pinion through the rack |00 also rotates connecting shaft |06, rotating roll feed drive shaft |08 through a pair of bevel gears 0. The drive shaft |04 is splined to sleeve ||2 such that the sleeve may reciprocate relative to the drive shaft |04. Rotation of the sleeve ||2 will operate the feed rolls ||4 and H5 through gears in gear box H3. The upper position of the feed rolls is shown by ref- 4 erence numerals ||4 and I5. The lower posi' tion of the feed rolls is shown by the reference numerals ||4a and ||5a.

Similarly the lower end of roll feed drive shaft |08 is housed in a splined sleeve ||6 such that the sleeve ||6 may reciprocate relative to the drive shaft |08 and drive the feed rolls ||8 and ||9 through appropriate gearing. The upper position of the feed rolls driven by the shaft |08 is shown by the reference numerals ||8 and IIS. The lower position of the feed rolls is shown by the reference numerals ||8a and |I0a.

The levers 86 carry cam followers |20 similar to cam followers 96. The ends of levers 06 support a pair of tension rods |22 similar to tension rods 90. The lower ends of rods |22 are pivotally secured to a pair of lugs |24 carried by the roll feedsupporting framework 94. A lift-out bar |26 is likewise carried by the framework and adapted to reciprocate with it.

The bed bolster carries a die 4| intermediate the idle rst station and the idle second station adapted to cooperate with the upper lancing die 42. The bed bolster 40 carries a die 45 adapted to cooperate with the upper drawing die 46 at the third sta-tion. The lower die is provided with a stripper pad |28. Stripper pins |30, adapted to be actuated by the lower lift-out bar |26, contact the lower surface of the stripper pad |28. A lower piercing die 49 cooperates at the fourth station with the upper piercing die 50 and is provided with a stripper pad |32, the lower surface of which contacts stripper pins |34, adapted to be actuated by the lower lift-out bar |26. At the fifth station, we provide a lower redrawing die 53 adapted to cooperate with the upper redrawing die 54. The lower redrawing die 53 is provided with a stripper pad |36, the lower surface of which is in contact with stripper pins |38, adapted to be actuated by the lower lift-out bar |26. At the sixth station, we provide a trimming die 57 adapted to co-act with the upper trimming die 58, the finished piece adapted to drop as shown-by the dotted-line position and the arrow. It is-to be understood of course that any desired die arrangement may be used, the particular die arrangement shown being for purposes of illustration only and not by way of limitation.

In Figure l, the stock enters the initial feeding rolls ||8 andv |9 and is fed to the .left by the conjoint action of rollsl |8 and ||9 and lrolls ||4 and ||5 which are moved in timed relation by a common drive while the rolls are in the upper position shown by the line indicated bythe reference numeral |40. The stock in the process of being formed is in the position indicated by the reference numeral |42 during .the working part of the cycle. The stock material, after the` shapes being pressed in the presshave been trimmed from the sheet, moves to the left and comes into contact with a scrap cutter.

In the form of the scrap cutterV shown in Figures 2 and 3, an eccentric |44 is'secured tov shaft 'H which is rotated by the gear 10 meshing with pinion 12. Rotation of the eccentric reciprocates a pitman |46 secured thereto in. predetermined timed relation. The lower end of pitman |46 is secured to a connecting member |48 carried in a housing |50. The member |48 is provided with a screw |52, the position of which is adjusted by nut |54, the periphery of which is provided with a worm gear cooperating with a worm |56. The worm |56 is rotated by hand Wheel |58 and is adapted to adjust a blade holder 6,0 to which the upper cutting blade |162 is secured. The blade holder |60 is adapted to reciprocate in a pair of guides |64. The lower blade |66 is carried by the frame 93 which is fastened to the bed of the press. The operation of the scrap cutter is timed so that the scrap is cut after the feeding motion has taken place and the feed is in the lowermost position.

In the form of the invention shown in Figures 4 and 5 where the scrap comprises strips at each edge of the stock, the scrap cutter need not extend the full width as shown in Figures 2 and 3. In such a case, the scrap cutter may be operated by the motion of the roll-carrying framework.

Referring now to Figure 4, the scrap cuttel comprises a pair of lower blades which are fixed to the reciprocating roll-carrying framework 94. The press frame I0 carries a pair of lugs |12, each having an adjustable screw |74. The upper blades of the scrap cutters |16 are pivoted. As the lifting rods 90 and |22 move the framework carrying the rolls ||4 and ||5 upwardly, rollers |78 carried by extensions of the upper blades |16 engage the screws |14 so as to pivot the upper blades to open position, thus insuring that the cutters are in open position during the roll-feeding movement. While in this position, the roll-feeding drive mechanism operating through drive shaft |04 and splined sleeve ||2 and associated gearing rotate the feeding rolls I|4 and ||5 to move the stock being fed through a predetermined distance. A lower pair of lugs |86 carried by the press frame carry adjustable screws |82. As the roll-carrying framework moves downwardly, the screws |82 will engage rollers |78 to pivot the upper blades |16 to closed position, thus effecting the cutting of the scrap. This type of scrap cutter is adapted only for operations using one width of stock. If different widths of stock are to be used, a scrap cutter running the entire width of the rolls is preferred.

In operation, the stock |42 is threaded to the second station and the press sei-l into operation. The cams 7S and 80 will move about 140 from the position shown in Figure l, permitting the stock to lie over the lower die. The press completes its cycle and the lancing die 42 will lance the end of the stock at a point between the first and second stations which are idle. As the cycle continues, the cams 'i8 and 80 will return to the position shown in Figure 1 and pull rods 94| and |22 will lift the framework upwardly to move the stock and the feeding rolls to the level shown by construction line |40 in Figure 1. While the stock is in this position, the roll-feeding mechanism will be actuated to rotate the rolls just sufficiently to move the end of the stock one station. The end of the stock is now in the third station and the dies 46 and 45 will cooperate to perform the rst draw. As the cams again lift the rollcarrying framework and the lower lift-out bar |26 upwardly, the stripper pins |30 will move the blank holding pad |28 upwardly to move the stock again to the position level of the construction line |40 so that the cupped portions are clear of the re-entrant portions of the die. In this position, the feeding rolls are again operated by the roll feeding mechanism to roll the stock through one station, bringing a fresh portion of the stock to the third station and moving the stock which formerly occupied the third station to the fourth station. rIhe cycle of the press then continues to lower the stock to the die surface by the operation of cams '|8 and 80. The press drive train operates the press slide and the upper bolster seats the upper dies into their co-acting lower dies. At the third station, the first draw is again performed on a fresh section of the stock while at the fourth station die 50 cooperates with die 49 to pierece the stock which has been subjected to the first draw. As the two pairs of cams i8 and 8i) move the draw bars 9 and |22 upwardly, the roll-carrying framework moves upwardly, together with the lower lift-out bar |26. The stripper pins |30 move the pad |28 0f the die 45 upwardly and the stripper pins |34 move the stripper pad |32 upwardly so that the cups at the third and fourth stations are moved out of the lower dies to the level indicated by the construction line |40 along with the feeding rolls. While the feed roll-carrying framework and the lower lift-out bar are dwelling in the upper position, the roll-feeding mechanism is again operated to move the stock to the left, as viewed in Figure l, through one station. Fresh stock is now brought to the first draw, the portion of the stock subjected to the rst draw is brought to the fourth station for action by the piercing dies and the stock which has been subjected to the rst draw at the first station and pierced at the fourth station is now in position at the fifth station. The continuation of the cycle drops the feed roll-carrying framework and the lift-out bar, permitting the stock to move to the position shown in full lines in Figure 1. At the fifth station, the stock is subjected to a redrawing operation by the co-action of dies 53 and 54, dies 5|] and 49 cooperating to pierce, and dies 45 and it cooperating to perform the first draw. When the feed roll-carrying framework is again moved upwardly, not only do the stripper pins |3 and |34 operate but the stripper pins |38 co-act with the stripper pad |36 to lift the stock subjected to the redrawing operation at the fifth station so that all of the stock and the feed rolls is lifted clear of the lower dies. While the stock dwells in this position, the feed rolls again operate to move the stock to the left through another station. This brings the stock occupying the position at the third station to the fourth station, that occupying the fourth station to the fifth station and that occupying the fifth station to the sixth station. The cycle is again performed by the press and the stock at the sixth station is trimmed by the co-acting trimming dies 51 and 58 so that the formed part drops as shown by the arrow. Another cycle brings the end of the stock to the feed rolls ||4 and ||5 which are operated by a drive mechanism in common with the drive mechanism for feed rolls H3 and H9. The stock will then move step-by-stepwise with operations between movements to the left. Just after the stock has been advanced while in the upper period of dwell of the roll-carrying framework, the eccentric which drives the scrap cutter moves the pitman |46 and the upper blade |62 downwardly to cut the end of the used stock into a strip of scrap.

The scrap cutter has a long stroke so that the blade |62 is above the stock while the stock is being fed and moving down. At about of the eccentric gear motion, the downward motion stops. The scrap cutter blade continues downwardly and cuts oir the scrap.

The timing of the motions of the slide, the scrap cutter and the lower lift-out in a typical case is shown in Figure 6.

In the form of the invention shown in Figure 5, the upper adjusting screws |74 insure that the blades are open during the period in which the roll feed operates to feed the stock through the predetermined distance. As the draw rods permit the roll-carrying framework to move down wardly the lower adjusting screws |82 operate the upper scrap cutting blades H6 to cut the scrap.

It will be seen that we have accomplished the objects of our invention. We have provided a power press in which progressive dies formed with re-entrant portions may be fed with stock material automatically by a double roll feed in which the feed rolls are carried up and down in a predetermined timed relation. The stock is thus carried clear of the die cavities during the period in which the stock is fed for the next operation. The roll-carrying framework is reciprocated in phased relationwith thepress slide and with the operation of the die lift-out mechanism. We have-provided a power presshaving a roll feed moved to a position clear of the die cavities during the feeding of the stock in combination with the scrap cutter whose operation is timed with the press ram feeding rolls and liftout movement in such manner as to provide a continuous feeding of the stock with the cutting ofthe ends of the used stock into scrap.

It will be understood that certain features and subcombinations are of utilityl and may be employed without reference to other features and subcombinations. This is contemplated byv and is within the scope of our claims. It is further obvious that various changes may be made in details within the scope of our claims without departing fromrthe spirit of our invention. It is therefore to be understood that our invention is not to be limited-to the specific details shown and described.

Having thus described our invention what we claim is:

1. In aipower press, a slide, a bed bolstery driving means for reciprocating said slide, means adapted to support a die on the bed bolster, means adapted to support a co-acting die for cooperation with the die carried by the bed bolster, 4a movable fra-me, stock-feeding rolls carried by saidframe, means drivingly connecting said frame to said slide-driving means for reciprocating said frame vertically in predetermined timed relation with said slide, and means driven from said slide-driving means for operatingV saidfeeding rolls in predetermined phasedl relationwith the movement of `said feed rollcarrying frame.

2. Inla power press, al slide, a bed bolster, driving.l means for reciprocating said slide, means adaptedv to support a die on the bed bolster, meansadapted to support a co-acting die for cooperation with the die carried by the bed bolster, a movable frame, stock-feeding rolls carried by said frame, means drivingly connecting said vframe to said slide-driving means for reciprocating said frame vertically in predetermined timed relation with said slide, Vmeans driven from said slide-driving means for operatingvsaidV feeding rolls in predetermined phased relation with the movement of said vfeed rollcarrying frame, said die .carried by the bed bolster being provided with a 'lift-out pin, a lift-out .bar carried by said frame for operating said lift-out piny the arrangement being `such that when the frame is moved upwardly thefstock-feeding rolls and the lift-out pin will raise Vthe kstockito a level clear of the bed die.

3. In a power press, a slide,;a bed bolster, driving means for reciprocating saidV slide, Vmeans adapted to support a diecn thev bed bolster,

means adapted to support a co-acting die for cooperation with the die carried by the bed bolster, a movable frame, stock-feeding rolls carried by said frame, means drivingly connecting said frame to said slide-driving means for reciprocating said frame vertically in predetermined timed relation with said slide, means driven from said slide-driving means for operating said feeding rolls in predetermined phased relation with the movement of said feed rollcarrying frame, a scrap cutter carried by said frame, and means for actuating said scrap cutter from said slide-drivingmeans in predetermined timed relation with the movement of said slide and said frame.

4. In a power press, a slide, means for reciproeating said slide, a prime mover for driving said slide-reciprocating means, a movable framework carried by the power press for reciprocal movement relative to said slide, means driven from said slide-driving means for reciprocating said framework vertically in predetermined timed relation with the movements of said slide, a pair of stock-feeding rolls carried by said framework, means driven from said slide-driving means for operating said stock-feeding rolls in predetermined timed relation with the movement of said framework, the construction being such that said feeding movement will occur while said framework is in a raised position whereby the stock may be fed in a raised position.

5. A power press as in claim 4 including in combination a bed bolster, a slide bolster carried Aby said slide, co-acting dies carried by the slide bolster and the bed bolster, a lift-out bar carried by said framework, stripper pins associated with said bed bolster dies actuated'by said lift-out bar whereby the stock is moved to raised position by said stock-feeding rolls and said stripper pins.

6. A power press as in claim 4 including in combination a scrap cutter having at least one blade carried by said framework, means rdriven from said slide-driving means for actuating said scrap cutter in predetermined timed relation.

7. A power press as in claim 4 including in combination a scrap cutter carried by said frame'- work and means for operating said scrap cutter as a function of the movement of said framework.

8; A power press as in `claim l4in which said stock-feeding rolls compriseV two pairs of rolls positioned on each side of the slide.

9. A power press as in claim 4 in which said means driven from said slide-driv-ing means for reciprocating said framework includes'a pair of shafts, respective gears secured to said shafts each meshing with a gear of a gear train for reciprocating said slide, a pair lof cams secured to respective shafts for rotation therewith, and draw bars actuated by said .shafts secured to said framework.

10. A power press as in claim 4 in which said means driven from said slide-driving means for reciprocating said framework includes a .pair of shafts, respective gears secured to said shafts each meshing with a gear of a'gear train for reciprocating said slide, a pairof cams secured to respective shafts for rotation'therewith, a pair of levers pivoted to the'press, cam followers adapted to be actuated by said cams' carried by said levers intermediate their ends and draw bars extending from the ends of said levers to said framework.

11. A power press as inclaim 4 in which said means Adriven from the slide-driving means for operating the stock-feeding rolls includes a shaft, a gear secured to said shaft for rotation therewith, said gear meshing with the gear of the gear train for reciprocating said slide, a rack, means actuated by the rotation of said shaft for reciprocating said rack, a pinion, and overrunning clutch means connecting said pinion to a roll feed drive shaft.

12. A power press as in claim 4 in which said means driven from the slide-driving means for operating the stock-feeding rolls includes a shaft, a gear secured to said shaft for rotation therewith, said gear meshing with the gear of the gear train for reciprocating said slide, a rack, means actuated by the rotation of said shaft for reciprocating said rack, a pinion, overrunning clutch means connecting said pinion to a roll feed drive shaft, said drive'shaft including a section permitting relative movement longitudinally of the drive shaft while preventing relative rotational movement between said section and the shaft, the construction being such that the feed rolls may reciprocate relative to one portion of the feed roll drive shaft.

13. A power press as in claim 4 including in combination a scrap cutter one blade of which is carried by said framework, a second blade adapted to co-act with said first blade, means for mounting said second -blade for reciprocal movement relative to the press frame, said means for reciproeating said framework including a shaft, means to rotate said shaft from the driving train for reciprocating said slide, an eccentric carried by said shaft, and a pitman connecting said eccentric to said second blade for reciprocating it in predetermined timed relation to the movement of the press slide.

14. A power press as in claim 4 including in combination a scrap cutter one blade of which is carried by said framework, a second blade adapted to co-act with said first blade, means for mounting said second blade for reciprocal movement relative to the press frame, said means for reciprocating said framework including a shaft, means to rotate said shaft from the driving train for reciprocating said slide, an eccentric carried by said shaft, a pitman connecting said eccentric to said second blade for reciprocating it in predetermined timed relation to the movement of the press slide, and means for adjusting the position of said second blade whereby to vary the ambit of its travel.

GEORGE I. DANLY.

VASIL GEORGEFF.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 395,211 Breul Dec. 25, 1888 473,215 Egge Apr. 19, 1892 726,800 Langbein Apr. 28, 1903 854,7()6 Eden May 21, 1907 1,016,547 Cahill Feb. 6, 1912 1,357,357 Smith Nov. 2, 1920 1,408,894 Ganke Mar. 7, 1922 1,421,354 Littell June 27, 1922 1,872,474 Lindgren Aug. 16, 1932 1,883,996 Leland Oct. 25, 1932 2,268,054 Miller Dec. 30, 1941 2,339,456 Budlong Jan. 18, 1944 2,349,874 Littell May30, 1944 2,411,503 Calleson et al. Nov. 26, 1946 FOREIGN PATENTS Number Country Date 133,849 Germany of 1902

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2854939 *Oct 1, 1953Oct 7, 1958Nat Electric Prod CorpApparatus for making electrical outlet boxes with automatic operation
US2918721 *Mar 12, 1953Dec 29, 1959Sylvania Electric ProdProcess for fabricating a socket mount
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US3795167 *May 5, 1972Mar 5, 1974Moeller & Neumann GmbhPlate trimming shears
US5666838 *Jun 5, 1995Sep 16, 1997Efco, IncorporatedForging press for use with automated multi-station transport system
Classifications
U.S. Classification29/33.00R, 226/156, 83/255, 83/923, 100/215, 72/405.12
International ClassificationB21D43/05
Cooperative ClassificationB21D43/05, Y10S83/923
European ClassificationB21D43/05