US1622590A - Stretching die for sheet metal - Google Patents

Stretching die for sheet metal Download PDF

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Publication number
US1622590A
US1622590A US637371A US63737123A US1622590A US 1622590 A US1622590 A US 1622590A US 637371 A US637371 A US 637371A US 63737123 A US63737123 A US 63737123A US 1622590 A US1622590 A US 1622590A
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jaws
frame
metal
die
shaped
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US637371A
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Jolstad Trygve
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MICHIGAN STAMPING Co
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MICHIGAN STAMPING Co
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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
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20Deep-drawing
    • B21D22/26Deep-drawing for making peculiarly, e.g. irregularly, shaped articles

Definitions

  • An object of the invention is to provide a simple land effective device for holding the metal so that it will not slip while it is being shaped to the desired form.
  • Another object is to provide reliable and practical means for clamping the jaws upon the metal while at the same time permitting the jaws to slider during the operation of thc die.
  • Another object is to provide means for normally retainino' the jaws in retracted position and for regulating the sliding movement thereof whereby the metal will be shaped properly by the die.
  • Fig. l is a fragmentary front elevation of a press and showing parts in section;
  • Fig. Q is a perspective view of the .bed plate and supporting frame for the jaws;
  • Fig.l 3' is a sectional view takenon line 22 of Fig. 2;
  • Fig.k l is an enlarged vertical sectional view through the bed-plate, frames and dic and showing lthe jaws in elevation;
  • Figs. 5, (l, and 7 are. views similar to Fig. 4; but showing a slightly modified construction.
  • a reciprocatory holder is employed to clamp the sheet metal directly upon the bed plate so that the metal is permitted to slide 'over the edges lsurrounding the central opening in the bed plate when the die is operated to shape the metal.
  • the metal very often slips while being shaped with the die with the result that the metal is shaped improperly.
  • it is necessary to provide relatively wide sheets of metal so thatl there will be suiflcient bearing surfaces aty the edges thereof for engagement with the bed plate to prevent the metal from being pressed entirely through the opening therein when the die is operated.
  • Such constructions are objectionable -forv the reason that after the metal has been shaped, the
  • the sheet of metal to be shaped is preferably held in proper position over the frame l by means of a plurality of sets of comple ment-ary elongated jaws 6 and which are provided with teeth 8' that grip the metal at its ⁇ opposite edges.
  • the jaws 6 of each set may be mounted on any two of the side bars 9 of the frame and preferably entend longitudinallyv thereof while the complementary cti-operating jaws 'l' of each set are preferably provided with rearwardly ent-ending lugs 'l0 that are mounted on horizontal pivots 1l extending through spaced lugs l2 on the jaws G.
  • the jaws@ are adapted to slide over spaced parallel elongated trans' versely extending recesses 13 in the upper surface 'of ⁇ the side bars of the frame and are preferably prwided with laterally ein tending ribs l/l that engage inverted substantially l.-sliaped guides l5 detachably secured to the framed, while the jaws 7 are normally held in r ised position with respect to the aws 6 by means of coil springs 16 engaging recesses in the opposed faces of vthe jaws.
  • Yoles 1T extend downwardly from rearward extensions 18 on the jaws 6 and embrace spools 19 that are slidably mounted on bolts 2O extending longitudinally of the recesses 13 in the frame.
  • Coil springs 2l surround the bolts between the spools andthe inner ends of the recesses 13 and norn'ially retain the jaws spaced from the inner edges of the frame l.
  • a vertically movable horizontal frame 22 sur rounds the die and is adapted to move the pivoted jaws 7 downwardly against the tension of the springs 16 to clamp the metal upon the jaws 6.
  • the frame 22 may be actuated by any suitable means (not shown) and the movement thereof is preferably timed with relation to the die 5 so that the frame 22 will clamp the pivoted jaws 7 upon the metal before the die is moved downward. Likewise the die .may be moved upwardly in advance of the frame 22.
  • a sheet of metal may be placed upon the jaws 6 and the frame 22 may be lnovec downwardly to clamp the jaws 7 upon the metal.
  • the die may then be lowered to shape the metal and during the shaping operation, the metal will be pressed downwardly as shown in Figure 4 which will cause the jaws to slide inwardly between the frames 4 and 22. 1When the die is raised the springs 16 will raise the upper jaws 7 and the springs 2l will return both the jaws 6 and 7 to normal retracted position.
  • a slightly diiferent form of frame 30 is used.
  • the bars 3l of this frame preferably incline inwardly and are formed integral with vertical extensions 32 upon the bed plate 33.
  • a die 34 operable in a manner similar to the die 5, is used in this construction and is adapted to move downwardly between the frame 30 and the extensions 32 upon the bed plate to stretch the metal to the desired shape.
  • the metal to be shaped is adapted to be gripped at its opposite edges by means of jaws 35 which are slidably mounted on the bars 3l of the frame in a manner similar to the jaws 6 while jaws 36 are pivoted upon the jaws 35 in a manner similar to the jaws 7 and are normally spaced therefrom by means of coil springs 37.
  • the jaws 36 are adapted to be clamped upon the metal by means of a frame 33 which is provided with inclined portions 39 for engagement with the jaws 36 and which is movable vertically similar to the frame 22.
  • the inner ends of both the jaws 35 and 36 are inclined as shown at 40 and 4l respectively so that they will be in alignment with their sides 42 of the eX- tensions 32 when the jaws are moved inwardly.
  • Coil springs 43 are located in the recesses 44 in the frame bars supporting the jaws and engage depending lugs 45 upon the jaws 35 to normally retain the same in spaced relation to the inner edges of the frame 30.
  • the die 50 is preferably stationary and is mounted upon a bed plate 51 which is supported upon channel members 52 that are secured to a suitable base 53.
  • the frame 54 for supporting the jaws 55 and 56 surrounds the die 50 and is movable vertically with resp-ect to the bed plate.
  • the jaws 55 are slidably mounted on the frame in a. manner similar to the jaws 6 and are similar in construction, while the jaws 56 are pivoted upon the jaws 55 in a manner similar to the jaws 7 and are normally spaced from the jaws 55 by means of coil springs 57.
  • a plurality of arms 58 are secured io the frame 54 and extend downwardly through openings 59 and 60 respectively in the flanges 6l of the die and in the bed plate. These arms are connected at their lower ends to a plate 62 which is located beneath the bed plate 5l and between the channel menibers. Coil springs 63 are located between the base 53 and the plate 62 and normally retain the latter in engagement with the bed plate.
  • the jaws 56 are adapted to bc clamped upon the metal by means of a frame 64 which is also adapted to move the jaws 55 and 56 as well as the frame 54 downwardly against the tension of the springs 63 toward the bed plate so that the metal clamped by the jaws will be forced over the die and will be shaped accordingly. Any suitable means (not shown) may be employed for operating the frame 64.
  • a construction is shown for stretching a sheet of metal so as to remove all crimps and uneven surfaces preliminary to shaping the same.
  • a horizontal frame similar in construction to the frame 4 is formed integral with a bed plate 7l which is similar in construction to the bed plate 2.
  • Jaws 72 are slidably mounted on the frame 70 in a manner similar to the jaws 6 and are preferably similar in construction, while cooperating jaws 73 are pivoted upon the jaws 72 and are preferably similar in construction to the jaws 7.
  • the jaws 73 are adapted to be clamped upon the metal at the edges thereof by means of a frame 74 which may be moved vertically by any suitable means (not shown).
  • the jaws 72 and 73 are adapted to be moved outwardly to stretch the metal and for this purpose I preferably provide substantially L-shaped fingers 75 which are detachably secured to a vertically movable frame 76 and which are provided with inclined outer surfaces 77 at their lower ends for engagement with the outer walls of vertical openings 78 in horizontal arms 79 extending rearwardly from the jaws 72 intermediate the ends thereof. Any suitable means (not shown) may be employed for moving the frame 76 and fingers downwardly to cause both of the jaws 72 and 73 to be moved outwardly so that the sheet of metal clamped thereby will be stretched.
  • yieldableA means jl for normally 'f ietain' ingathe ⁇ lastfmentioned fjawlsini spaced rela'ljawfantl y'apivotallymountedupper jaw?
  • a pair of frames opposedjaws slidably mounted on one of said frames for supporting 'the metal to be stretched, jaws pivotally mounted on the jaws aforesaid and adapted to cooperate therewith to clamp the metal, yieldable means for normally retaining the pivoted jaws in raised position,- means for moving the other of said frames to clamp the pivoted jaws upon the metal, a die, and means for shaping the metal about the die.
  • a frame opposed jaws slidably mounted upon Lfor;ih t'jidlng j 'the@metalI to 'bef' shaped', means fore' claiipingsaid jawsl upon said j'inetal befl foe'it is shap'edwhile ⁇ at"the"samef'ti1ne peri mitting said jaws to move with the metal when said metal is being shaped, the ldirection of movement being substantially transverse to the direction of shaping of the metal, and means for regulating the movement ofl said jaws.
  • a pair of jaws pivotally connected to each other for clampingr the metal to be stretched, means for normally separating the jaws of said pair, a frame supporting said jaws, means for actuating one of said jaws to clamp the metal before it is stretched while at the same time permitting said jaws to slide upon said frame while securely clamped tothe metal, and yiel'dable means for regulating the sliding movement of said jaws.
  • the combination with a substantially horizontal frame for supporting the work, and a substantially vertically movable die for engagl jaws ofieach set, means vfor closing the jaws combinationlafwith a bedpla'te'of iijiovable'95 if ing the work, of means for holding the work including pairs of opposed jaws slidably mounted upon the upper face of said frame, means for maintaining said jaws in engagement with the work during a predetermined movement of the die, and means for lauto-v matically releasing the jaws from the work when said die reaches a predetermined position.
  • the combination with a stationary frame land a reciprocating frame, of means for holding the work upon the first-mentioned frame including reciprocating jaws on said firstmentioned frame movable alonglines extending from the outer edges: of said frame toward the center thereof, and cooperating jaws pivotally mounted .upon the reciproeating jaws in suchv a way as to be moved automatically by the reciprocating Vframe into engagement with thework.
  • a frame having an opening at the center thereof for receiving a reciprocating die, means for holding sheet metal to be shaped over said opening including reciprocating jawsV on said frame, and cooperating pivotally mounted jaws carried by said, reciprocating iaws, yieldable means normally maintaining frame having a vertical opening therein, and
  • a substantially vertically movable reciproeating die movable into said opening7 of means for holding the work including reciprocating jaws movable over the upper face of said frame along lines extending from the outer edges of said frame to the edges of said opening.
  • a frame having an opening therein for receiv- Ling the work whileit is being shaped
  • means engageable with the work for shaping the same, and means for holding the work including reciprocating jaws movable over the upper face of said frame along lines extending from the outer edges of said frame to the edges of said opening.

Description

March 29 1927. 1,622,590 ,'r. JoLsTAD STRETCHING DIE FOR SHEET METAL Filed May '7, 1923 4 Sheets-Sheet 1 llllllll/ /lllllllllll INVENTOR. Tryin@ r1'a2sa" ATTORNEYS March 29,1927. 1,622,590
- T. JoLsTAD sTnETcHING Dm FOR SHEET METAL FiledMay v, 192s 4ksneets-s`heet z INVLNTR. 7;;3/0 71 rfal 5 fa l ZM. #um am A ATroRzvEl/ y March 29 1927. 1,622,590
T. JQLSTAD l STRETCHING- DIE FOR SHEET METAL Filed May v. 1925 4 sheets-sheet s g f f4 f f7 0 5/1 w A INVLNToR. 2/ "Y Z3' A Y 63" BY Wi/a rLsac g a HSM ATTORNEYS March 29, 1927.
.I -T. JoLsTAD sTRETcHING DIE FOR SHEET METAL Filed May '.7,
um f Q7, w w
NVENTOR. Try-fra 1752s fad' Patented Mar. 29, 1927.
TRYsvn JoLsTan, or DETROIT, MICHIGAN,
PANY, or DETROIT, ments-AN,
ASSIGNOR T MICHIGAN STAMENG COM- A CGRPORATEON GF MICHIGAN.
STRETCHING; FOR SHEET METAL.
Application filed May 7 This invenion relates to dies for stretehing and shaping sheet metal.
An object of the invention is to provide a simple land effective device for holding the metal so that it will not slip while it is being shaped to the desired form.
Another object is to provide reliable and practical means for clamping the jaws upon the metal while at the same time permitting the jaws to slider during the operation of thc die.
Another object is to provide means for normally retainino' the jaws in retracted position and for regulating the sliding movement thereof whereby the metal will be shaped properly by the die.
lith the above and other objects .in view7V the invention consists of certain novel features of construction, combinations and arrangeu'ients of parts as .will be more fully described and particularly pointed out in the appended claims;`
ln the accompanying drawings :j-
Fig. l is a fragmentary front elevation of a press and showing parts in section;
Fig. Q is a perspective view of the .bed plate and supporting frame for the jaws; Fig.l 3' is a sectional view takenon line 22 of Fig. 2;
Fig.k l is an enlarged vertical sectional view through the bed-plate, frames and dic and showing lthe jaws in elevation; and
Figs. 5, (l, and 7 are. views similar to Fig. 4; but showing a slightly modified construction.
With certain constructions now in use, a reciprocatory holder is employed to clamp the sheet metal directly upon the bed plate so that the metal is permitted to slide 'over the edges lsurrounding the central opening in the bed plate when the die is operated to shape the metal. However, it has been found that the metal very often slips while being shaped with the die with the result that the metal is shaped improperly. It has also been found that it is necessary to provide relatively wide sheets of metal so thatl there will be suiflcient bearing surfaces aty the edges thereof for engagement with the bed plate to prevent the metal from being pressed entirely through the opening therein when the die is operated. Furthermore, Such constructions are objectionable -forv the reason that after the metal has been shaped, the
1923. Serial No. 637,371.
'2 which preferably provided with a central opening r3 and an integral horizontal frame et to receive the die or plunger 5 for stretching the metal. This die may be any shape desired and any suitable means may be employed for actuating the same' The sheet of metal to be shaped is preferably held in proper position over the frame l by means ofa plurality of sets of comple ment-ary elongated jaws 6 and which are provided with teeth 8' that grip the metal at its `opposite edges. The jaws 6 of each set may be mounted on any two of the side bars 9 of the frame and preferably entend longitudinallyv thereof while the complementary cti-operating jaws 'l' of each set are preferably provided with rearwardly ent-ending lugs 'l0 that are mounted on horizontal pivots 1l extending through spaced lugs l2 on the jaws G. The jaws@ are adapted to slide over spaced parallel elongated trans' versely extending recesses 13 in the upper surface 'of `the side bars of the frame and are preferably prwided with laterally ein tending ribs l/l that engage inverted substantially l.-sliaped guides l5 detachably secured to the framed, while the jaws 7 are normally held in r ised position with respect to the aws 6 by means of coil springs 16 engaging recesses in the opposed faces of vthe jaws. Yoles 1T extend downwardly from rearward extensions 18 on the jaws 6 and embrace spools 19 that are slidably mounted on bolts 2O extending longitudinally of the recesses 13 in the frame. Coil springs 2l surround the bolts between the spools andthe inner ends of the recesses 13 and norn'ially retain the jaws spaced from the inner edges of the frame l. j
Any suitable means may be employed for clamping the pivoed jaws 7 upon the metal and for holding the said' jaws in clamped position during the operation of the die, while at the same time permitting the jaws 6 and 'l' to slide inwardly. As shown, a vertically movable horizontal frame 22 sur rounds the die and is adapted to move the pivoted jaws 7 downwardly against the tension of the springs 16 to clamp the metal upon the jaws 6. The frame 22 may be actuated by any suitable means (not shown) and the movement thereof is preferably timed with relation to the die 5 so that the frame 22 will clamp the pivoted jaws 7 upon the metal before the die is moved downward. Likewise the die .may be moved upwardly in advance of the frame 22.
In use, a sheet of metal may be placed upon the jaws 6 and the frame 22 may be lnovec downwardly to clamp the jaws 7 upon the metal. The die may then be lowered to shape the metal and during the shaping operation, the metal will be pressed downwardly as shown in Figure 4 which will cause the jaws to slide inwardly between the frames 4 and 22. 1When the die is raised the springs 16 will raise the upper jaws 7 and the springs 2l will return both the jaws 6 and 7 to normal retracted position.
In the modification illustrated in Figure 5, a slightly diiferent form of frame 30 is used. The bars 3l of this frame preferably incline inwardly and are formed integral with vertical extensions 32 upon the bed plate 33. A die 34, operable in a manner similar to the die 5, is used in this construction and is adapted to move downwardly between the frame 30 and the extensions 32 upon the bed plate to stretch the metal to the desired shape. The metal to be shaped is adapted to be gripped at its opposite edges by means of jaws 35 which are slidably mounted on the bars 3l of the frame in a manner similar to the jaws 6 while jaws 36 are pivoted upon the jaws 35 in a manner similar to the jaws 7 and are normally spaced therefrom by means of coil springs 37. The jaws 36 are adapted to be clamped upon the metal by means of a frame 33 which is provided with inclined portions 39 for engagement with the jaws 36 and which is movable vertically similar to the frame 22. The inner ends of both the jaws 35 and 36 are inclined as shown at 40 and 4l respectively so that they will be in alignment with their sides 42 of the eX- tensions 32 when the jaws are moved inwardly. Coil springs 43 are located in the recesses 44 in the frame bars supporting the jaws and engage depending lugs 45 upon the jaws 35 to normally retain the same in spaced relation to the inner edges of the frame 30.
In the modification illustrated in Figure 6, the die 50 is preferably stationary and is mounted upon a bed plate 51 which is supported upon channel members 52 that are secured to a suitable base 53. The frame 54 for supporting the jaws 55 and 56 surrounds the die 50 and is movable vertically with resp-ect to the bed plate. The jaws 55 are slidably mounted on the frame in a. manner similar to the jaws 6 and are similar in construction, while the jaws 56 are pivoted upon the jaws 55 in a manner similar to the jaws 7 and are normally spaced from the jaws 55 by means of coil springs 57.
A plurality of arms 58 are secured io the frame 54 and extend downwardly through openings 59 and 60 respectively in the flanges 6l of the die and in the bed plate. These arms are connected at their lower ends to a plate 62 which is located beneath the bed plate 5l and between the channel menibers. Coil springs 63 are located between the base 53 and the plate 62 and normally retain the latter in engagement with the bed plate. The jaws 56 are adapted to bc clamped upon the metal by means of a frame 64 which is also adapted to move the jaws 55 and 56 as well as the frame 54 downwardly against the tension of the springs 63 toward the bed plate so that the metal clamped by the jaws will be forced over the die and will be shaped accordingly. Any suitable means (not shown) may be employed for operating the frame 64.
In th-e modification illustrated in Figure 7 a construction is shown for stretching a sheet of metal so as to remove all crimps and uneven surfaces preliminary to shaping the same. In detail, a horizontal frame similar in construction to the frame 4 is formed integral with a bed plate 7l which is similar in construction to the bed plate 2. Jaws 72 are slidably mounted on the frame 70 in a manner similar to the jaws 6 and are preferably similar in construction, while cooperating jaws 73 are pivoted upon the jaws 72 and are preferably similar in construction to the jaws 7. The jaws 73 are adapted to be clamped upon the metal at the edges thereof by means of a frame 74 which may be moved vertically by any suitable means (not shown).
The jaws 72 and 73 are adapted to be moved outwardly to stretch the metal and for this purpose I preferably provide substantially L-shaped fingers 75 which are detachably secured to a vertically movable frame 76 and which are provided with inclined outer surfaces 77 at their lower ends for engagement with the outer walls of vertical openings 78 in horizontal arms 79 extending rearwardly from the jaws 72 intermediate the ends thereof. Any suitable means (not shown) may be employed for moving the frame 76 and fingers downwardly to cause both of the jaws 72 and 73 to be moved outwardly so that the sheet of metal clamped thereby will be stretched.
Thile it is believed that from the foregoing description, the nature and advantages of the invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein shown and lll described andmthaft such 'clial1-igea'd may fberesortedfto when .desired slfalili within fthe-f scope ofwliattiisl:claimefdw-` What vI claim =asrimy invention is 1. Inl a devicefoit'hc class deseribed,"az plu-A rality'fof opposed lslidablymountedjaws for* clamping'the metal to 'be stretched; asupportif-f 'for said jaws, means for actuating oneiofr sa-id jaws tof'clafm'p Fthe i metall while at ,the
same timeh permit-ting said `'fjaws to 1"- 1nove f upon` said support with the metalin-"a' dir' e tion substantiallytransve'rse tol-the'ildireetion off 1 stretching of f the smet-al and meansifAv said` vframe,'guides for said jawsdtachablyf secu-red' tp saidi frame;jawspivotallymountr ed-o'n saidislidablyjrnotintedI jawsiand fada'ptf ed 'to' 1coop,eratethere'v'vith to lclampthe meta-l;
"i, means' #for normally "retaining/ saidifpivotec'l '-70 jawsfin raised position, means for clamping sai-d'1 pivoted"jawsiuponsaid drietal, afdie'and* meansiorshapingthenetal about the `die'.'." 7, In a press for Iworking sheetimetal; the
,-11 of-.s'etsfof' complementary jaws slidablymounted on saidbed-plateaty-oppoi site sideswf.- said opening, yieldable means carried ,hywsaid support lfor `regulatingttheynorrnallyl-v separating the complementaryv slidingunovement ofisaidffjaws'r` j 2. In a device of thefclas'sdes'cribed, apl'ulrality `of -co-'operat'ingv jawsfor-'fholdlng the@ metal to be shaped therebetween, framem lling pivotedfu lfo'iic lampir'i'g said vcomplementaryjaws upon when-said jaws-'are -closedf 1` 8'. In'J a press for w'orkiiigsheet metah'thefI n' combination with 'a beidlplate', 'of` means onf-85 thebedfiplatej for 'holding the sheet metal to beisha'ped `4l`including a plurality? o fsets fai* f opposed slidably mounted compllen'ien'tary .j jaws, each set comprising a lower jaw and a ponsaid'lower jaw, andfmeans" theivmet'al'before it is'shapedLj" 9% "In a press for*working'sheetimetalgthe" ralityfof opposed slidablymounted-jiaws-fofmeans'onthe bedlplate for holdingth'e sheet supportingithe* metal Ito bei` stretched, pivot-"fi" ally mounted; jaws? adaptedft'o cooperate gwitlir l y`setsf-'fofk "comple the: slidably mounted jaws for hold-'ing the? metal, yieldableA means jl for normally 'f ietain' ingathe` lastfmentioned fjawlsini spaced rela'ljawfantl y'apivotallymountedupper jaw? 100G@ and means for -movingjthe pivot'ed'jawsof clamping the `pivota'lly mounted jaws*gup'on""lL` thefmetal., ra' die, 'andI lmean'sf'forljrelatiyey?1 ino-ving fthe a die i andy` sheetmetall for shaping 7 the metals:y j
4. In a device "ofi italie*l class -eles'c'ribredfg-^f opl?i posed Lslidably 1mefuntedjaws'=forf,s'upperti1gthe metal:ton-bestretched-g pivotally mounted jaws adapted to cooperate with the jaws aforesaid to clamp the metal, yieldable means disposed between the jaws aforesaid for normally retaining the pivotally mounted jaws in raised posit-ion, reciprocatory means for clamping the pivoted jaws upon the metal, a die, and means for shaping the metal about the die.
5. In a device of the class described, a pair of frames, opposedjaws slidably mounted on one of said frames for supporting 'the metal to be stretched, jaws pivotally mounted on the jaws aforesaid and adapted to cooperate therewith to clamp the metal, yieldable means for normally retaining the pivoted jaws in raised position,- means for moving the other of said frames to clamp the pivoted jaws upon the metal, a die, and means for shaping the metal about the die.
6. In a device of the class described, a frame, opposed jaws slidably mounted upon Lfor;ih t'jidlng j 'the@metalI to 'bef' shaped', means fore' claiipingsaid jawsl upon said j'inetal befl foe'it is shap'edwhile`at"the"samef'ti1ne peri mitting said jaws to move with the metal when said metal is being shaped, the ldirection of movement being substantially transverse to the direction of shaping of the metal, and means for regulating the movement ofl said jaws.
11. In a device of the class described a pair of jaws pivotally connected to each other for clampingr the metal to be stretched, means for normally separating the jaws of said pair, a frame supporting said jaws, means for actuating one of said jaws to clamp the metal before it is stretched while at the same time permitting said jaws to slide upon said frame while securely clamped tothe metal, and yiel'dable means for regulating the sliding movement of said jaws.
12. In a device of the class described, the combination with a substantially horizontal frame for supporting the work, and a substantially vertically movable die for engagl jaws ofieach set, means vfor closing the jaws combinationlafwith a bedpla'te'of iijiovable'95 if ing the work, of means for holding the work including pairs of opposed jaws slidably mounted upon the upper face of said frame, means for maintaining said jaws in engagement with the work during a predetermined movement of the die, and means for lauto-v matically releasing the jaws from the work when said die reaches a predetermined position.
13. In a device of the class described, the combination with a vertically movable die for shaping the work, a substantially horizontal frame having a central opening -for receiving the die, and a reciprocating frame above the frame aforesaid, of means for holding the work including reciprocating jaws on said first-mentioned Jframe movable along lines extending from the outer edges of said frame to the edges of said opening, and cooperating jaws pivotally mounted upon the reciprocating jaws in such away as to be moved automatically by the reciprocating frame aforesaid into engagement with the work. j
14. In a device of the class described, .the combination with a stationary frame land a reciprocating frame, of means for holding the work upon the first-mentioned frame including reciprocating jaws on said firstmentioned frame movable alonglines extending from the outer edges: of said frame toward the center thereof, and cooperating jaws pivotally mounted .upon the reciproeating jaws in suchv a way as to be moved automatically by the reciprocating Vframe into engagement with thework. s
l5. In a device of the class described, a frame having an opening at the center thereof for receiving a reciprocating die, means for holding sheet metal to be shaped over said opening including reciprocating jawsV on said frame, and cooperating pivotally mounted jaws carried by said, reciprocating iaws, yieldable means normally maintaining frame having a vertical opening therein, and
a substantially vertically movable reciproeating die movable into said opening7 of means for holding the work including reciprocating jaws movable over the upper face of said frame along lines extending from the outer edges of said frame to the edges of said opening.y
17. In a ydevice of the class described, a frame having an opening therein for receiv- Ling the work whileit is being shaped, and
means engageable with the work for shaping the same, and means for holding the work including reciprocating jaws movable over the upper face of said frame along lines extending from the outer edges of said frame to the edges of said opening.
18. In a device of the class described, the combination with a substantially horizontal frame having an opening therein for receiving the work while being shaped, and means for shaping t-he work, of means for holding the work while being shape-d including jaws movable over the upper face of said frame along lines extending from the outer edges of said frame to the edges of said opening, and means associated with said shaping meansfor maintaining said jaws in engagement with the work while the latter is being shaped, said last-mentioned means permitting said jaws to move over said frame along the lines speciiied while being shaped.
In testimony whereof I aflix my signature.
TRYGVE JOLSTAD.
US637371A 1923-05-07 1923-05-07 Stretching die for sheet metal Expired - Lifetime US1622590A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437092A (en) * 1944-09-22 1948-03-02 Hpm Dev Corp Metal-stretching press
US2613718A (en) * 1949-12-01 1952-10-14 Curtiss Wright Corp Drop stretch forming
US2619149A (en) * 1949-05-31 1952-11-25 North American Aviation Inc Method of joggling
US2665905A (en) * 1949-06-21 1954-01-12 Lyon George Albert Continuous web feeding mechanism
US2696241A (en) * 1950-07-03 1954-12-07 Northrop Aircraft Inc Wrap-stretch means
US2728373A (en) * 1951-08-04 1955-12-27 Reisholz Stahl & Roehrenwerk Process for expanding preheated tubular bodies
US2752982A (en) * 1952-05-15 1956-07-03 Romeo A Lalli Device for stretch forming metal sheets, and having a sheet metal die
US2753915A (en) * 1953-02-09 1956-07-10 Rohr Aircraft Corp Stretch forming machine
US3000429A (en) * 1956-06-22 1961-09-19 Studebaker Packard Corp Machine for prestressing and molding reinforced plastic members
US3008509A (en) * 1957-01-03 1961-11-14 Stalker Corp Machine for making blade envelopes
US3314269A (en) * 1966-08-12 1967-04-18 Cyril Bath Co Prestretch fixture and combination thereof with drawing die press
US20120090768A1 (en) * 2009-04-14 2012-04-19 Airbus Operations Gmbh Apparatus and method for draping knitted fiber fabrics for curved profiled structural parts of fiber composite material

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437092A (en) * 1944-09-22 1948-03-02 Hpm Dev Corp Metal-stretching press
US2619149A (en) * 1949-05-31 1952-11-25 North American Aviation Inc Method of joggling
US2665905A (en) * 1949-06-21 1954-01-12 Lyon George Albert Continuous web feeding mechanism
US2613718A (en) * 1949-12-01 1952-10-14 Curtiss Wright Corp Drop stretch forming
US2696241A (en) * 1950-07-03 1954-12-07 Northrop Aircraft Inc Wrap-stretch means
US2728373A (en) * 1951-08-04 1955-12-27 Reisholz Stahl & Roehrenwerk Process for expanding preheated tubular bodies
US2752982A (en) * 1952-05-15 1956-07-03 Romeo A Lalli Device for stretch forming metal sheets, and having a sheet metal die
US2753915A (en) * 1953-02-09 1956-07-10 Rohr Aircraft Corp Stretch forming machine
US3000429A (en) * 1956-06-22 1961-09-19 Studebaker Packard Corp Machine for prestressing and molding reinforced plastic members
US3008509A (en) * 1957-01-03 1961-11-14 Stalker Corp Machine for making blade envelopes
US3314269A (en) * 1966-08-12 1967-04-18 Cyril Bath Co Prestretch fixture and combination thereof with drawing die press
US20120090768A1 (en) * 2009-04-14 2012-04-19 Airbus Operations Gmbh Apparatus and method for draping knitted fiber fabrics for curved profiled structural parts of fiber composite material
US20180200966A1 (en) * 2009-04-14 2018-07-19 Airbus Operations Gmbh Apparatus and method for draping knitted fiber fabrics for curved profiled structural parts of fiber composite material
US10668671B2 (en) * 2009-04-14 2020-06-02 Airbus Operations Gmbh Apparatus and method for draping knitted fiber fabrics for curved profiled structural parts of fiber composite material

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