US3222909A

US3222909A - Cooler frame forming machine

Info

Publication number: US3222909A
Application number: US252243A
Authority: US
Inventors: Adam D Goettl; Jr Robert L Koble
Original assignee: McGraw Edison Co
Current assignee: Meritor Inc
Priority date: 1963-01-17
Filing date: 1963-01-17
Publication date: 1965-12-14
Anticipated expiration: 1982-12-14

Description

1 A. D. GOETTL ETAL 3,

COOLER FRAME FORMING MACHINE 6 Sheets-Sheet 1 Filed Jan. 1'7, 1963 INVENTOR. ADAM D. GOETTL BY ROBERT L. KOBLE JR.

Dec. 14, 1965 A. D. GOETTL ETAL 3,222,909

COOLER FRAME FORMING MACHINE Filed Jan. 17, 1963 6 Sheets-Sheet 2 INVENTOR. ADAM D. GOETTL i/ BY ROBERT L. KOBLE JR.

1965 A. D. GOETTL ETAL 3,222,909

COOLER FRAME FORMING MACHINE 6 Sheets-Sheet 5 Filed Jan. 17, 1963 INVENTOR. D. GOETTL ADAM ROBERT L. KOBLE JR.

Dec. 14, 1965 A. D. GOETTL ETAL 3,222,909

COOLER FRAME FORMING MACHINE 6 Sheets-Sheet 4.

Filed Jan. 17, 1963 L INVENTOR.

ADAM D GOETTL BY ROBERT L. KOBLE JR.

Dec. 14, 1965 A. D. GOETTL ETAL 3,222,909

COOLER FRAME FORMING MACHINE Filed Jan. 17, 1963 6 Sheets-Sheet 6 CIRCUIT BREAKER STARTER; I. I

BIEI

TRANSFORMER FUSES MO ART MOTI STOP STARTER CYC I START I EMER. STOP I c c STARTER O I 254 T'MERS U RELAYS RELAY J 274 LI 272 I I m J 3|6 H m4) C m r1 a 304 J 304 342 a 344 I 324 w RELAYS ,E W i BMDOWN A. 0 I ll Q Box oPEN o SIDES UP FOLD ToPaBoT LIPS 1L FQIAV/ZQDELIPS I! I II IL FST D ORNERS jq m II I *V *II STARE} MOTOR STARTER INVENTOR. ADAM D. GOETTL ROBERT L. KOBLE JR.

United States Patent 3,222,909 COQLER FRAME FORMING MACHINE Adam D. Goettl and Robert L. Koble, Jr., Phoenix, Ariz., assignors to McGraw-Edison Company, Milwaukee, Wis., a corporation of Delaware Filed Jan. 17, 1963, Ser. No. 252,243 Claims. (Cl. 72306) This invention relates to a sheet metal forming machine and more particularly to a sheet metal forming machine capable of forming the frame and pan structures of an evaporative cooler of a single piece of sheet metal.

Reference is hereby made to a patent application of Adam D. Goettl, Serial No. 859,757, filed December 15, 1959, for Evaporative Cooler Construction, which illustrates an evaporative cooler pan and frame structure formed of a single sheet of metal and which may be formed by the sheet metal forming machine of the present invention.

In the economical mass production of evaporative coolers, it has been a problem to utilize a single rectangular piece of sheet metal and form an evaporative cooler pan and frame structure comprising a sump pan at the bottom of the structure, a vertical flanged side wall, and an inverted pan-shaped top. Accordingly, evaporative coolers when formed quickly by a machine of the present invention, are very economical.

It has been recognized that the corner folds of the sump pan of such evaporative cooler structures and those folds integral with a vertical side wall of such an evaporative cooler, are diflicult to fold by a machine, particularly when the sump pan and a top inverted pan are integral with each other and Where the vertical structure is provided with flanges in alignment with the sides of the sump pan and the inverted pan-shaped top of the cooler structure. The forming of folded portions, at the corners of such structure, must be neat, structurally sound, and must be leak proof at the sump pan portions of the evaporative cooler structure and therefore high production machinery to manufacture such a product has posed many problems, particularly in the specific functions of folding the corners of these structures.

Accordingly, it is an object of the present invention to provide a sheet metal forming machine which is particularly adapted to form a single rectangular sheet of metal into a cooler sump pan and frame structure wherein a bottom sump pan is integral with a flanged side wall and an inverted pan-shaped top structure, all of which sections are integral with each other and disposed angularly at their junctures necessitating the forming of folded sections at such junctures.

Another object of the invention is to provide a very novel means for forming parallel flange structures of angularly related sheet metal panels and for folding the flange structures at the angularly related junctures to provide a neat, strong, folded structure.

Another object of the invention is to provide a sheet metal forming machine which is provided with a plurality of hinged folding plates having flange forming plates eased thereto and having flange forming plates of adjacent sections particularly arranged to form angularly folded portions at angular corners of the structure almost concurrently to obtain a high production rate of one piece folded evaporative cooler pan and frame structures.

Another object of the invention is to provide a novel sheet metal forming machine having novel hinge structure for pivotally supporting sheet metal forming plates outwardly of their surfaces which engage the sheet metal and whereby the pivotal center of the hinge structure is in alignment with the sides of said plates which engage the sheet metal.

Another object of the invention is to provide a sheet metal forming machine having a collapsible die assembly disposed to expand and retract internally of a set of folding forming plates externally thereof whereby, when the forming plates have folded a sheet metal piece around said die assembly and have formed box-shaped flanges inwardly around the corners of said die assembly, that said die assembly may be collapsed and retracted to clear the flanges of the formed sheet metal structure, whereby the formed part may be removed from the machine without interference with the die assembly.

Another object of the invention is to provide a sheet metal forming machine particularly adapted to produce substantially C-shaped evaporative cooler sump pan and frame structures wherein a box-shaped sump pan is connected integrally with an inverted box-shaped top by a side wall having flanges parallel to the sides of the boxshaped top and sump and whereby forming plates provided with pivoted flange forming plates efliciently form folded corners at the junctures of the side portions of the box-shaped structures and the flanged side portion of the cooler structure; said flange forming plates forming the folded sections substantially concurrently at opposite ends of the flange structure of the side portion of the cooled being of novel disposition with respect to each other and with respect to their respective pivotal axes.

Further objects and advantages of the invention may be apparent from the following specification, appended claims, and accompanying drawings, in which:

FIG. 1 is a side elevational view of a sheet metal forming machine, in accordance with the present invention; said machine being particularly adapted for use in forming sheet metal sump and evaporative cooler frame structures of a single sheet of metal; I

FIG. 2 is an elevational view of said machine taken from the line 2-2 of FIG. 1;

FIG. 3 is an enlarged fragmentary plan sectional view taken from the line 33 of FIG. 2 showing portions further broken away and in section and illustrating by broken lines, a varying position of parts coupled to novel hinge structure of general usage throughout the various hinged sections of the machine;

FIG. 4 is a fragmentary sectional view taken from the line 44 of FIG. 3;

FIG. 5 is an enlarged plan sectional view taken from the line 55 of FIG. 1;

FIG. 6 is a diagrammatic plan view taken from the line 66 of FIG. 1;

FIG. 7 is a fragmentary isometric view of the structure shown in FIG. 6 of the drawings in surrounding relationship with the collapsible die assembly of the invention and showing such structures in the act of forming folded corner structures of an evaporative cooler sump pan and frame structure in order to form such structure of t a single sheet of metal; I

FIG. 8 is an isometric view of a formed evaporative cooler sump pan and frame structure formed by the machine of the present invention from a single rectangular piece of sheet metal;

FIG. 9 is a diagrammatic view of the hydraulic actuating equipment of the machine of the present invention; and

FIG. 10 is a diagrammatic view of the electrical wiring of the machine of the present invention.

As shown in FIGS. 1 and 2 of the drawings, the machine is provided with a frame 12 'having a base 14 and an upright section 16 carrying cantilevered arm members 18 to which a plate 20 is fixed. This plate 20 is held in elevated position, as shown in FIGS. 1 and 2 of the drawings. Supported on the base 14 are fixed

legs

22 and 24 which carry a main forming plate 26 in' fixed position relative to the uprights 16 of the frame 12.

The forming plate 26 is provided with an upper surface 28 on which sheet metal is placed and formed, as will be hereinafter described in detail.

Carried by the plate 20, and fixed thereto, is a hydraulic cylinder 30 having a plunger 32 which suspends a collapsible and expandible die assembly 34 which is operable directly above and substantially in correspondence with the limits of the rectangular plate 26. A supporting plate 36 for this die assembly, is connected to the plunger 32 of the cylinder 30 and guide pins 38 are fixed to the plate 36 and are slidably mounted in openings 40 in the plate 20, all as shown best in FIGS. 1 and 2 of the drawings.

Disposed in a lower portion of the plates 36 is a T-slot 42 having T-head carriers 44 therein. These T-head carriers 44 are slidable longitudinally of the T-slot and are provided with downwardly depending shank portions 46 which pass through pivotal hinge structure 48 of hinged

side members

50 and 52 of the contractible and expandible die assembly of the present invention. As shown in FIG. of the drawings, there are a pair of the members 50 and a pair of the members 52 at each opposite side of the assembly thus superimposed members 50 are interconnected by vertically disposed bars 54 at the corners of the assembly. As shown in FIG. 5 of the drawings, this assembly is rectangular when extended and, as indicated by broken lines, these bars 54, in connection with the

members

50 and 52 are movable inwardly into a collapsed position.

Projecting from the

members

50 and 52 are pins 56 and 58-, respectively, which are engaged in

slots

60 and 62, respectively, in bars 64. The collapsible die assembly 34 is provided with four of these bars 64, two of which are connected by a substantially vertically disposed plate 66 and two of which are connected and fixed to another vertically disposed plate 68 which is at the opposite side of the die assembly from the plate 66.

The plates 66 and 68 are interconnected by a hydraulic cylinder 70, the base of which is secured to the plate 68 by bolts 72. A plunger 74 of the cylinder is fixed to the plate 66 so that retraction of the plunger 74 into the cylinder 70 causes the plates 66 and 68 to move together carrying the bars 64 and causing the

pins

56 and 58, coupled to'the

members

50 and 52, to move toward each other and causing the

members

50 and 52 to pivot relative to each other about the axes of the pins 46 until the collapsible and expandible die structure 34 of the invention has attained the broken line collapsed position shown best in FIG. 5 of the drawing-s.

Inte'rconnecting the vertically disposed bars 54 are horizontal members 76 which form upper and lower corner structures of the collapsible die assembly, these members 76 being in substantially a common plane with the upper and

lower members

50 and 52 of the die assembly 34. As will be hereinafter described, the corners of the

members

50 and 52, the corners of the upright members 54 and the corners of the horizontal members 76 all form die structure around which a piece of sheet metal may be folded in accordance with operation of the machine to produce a one piece evaporative cooler pan sump and frame structure, all as will be hereinafter described in detail.

It will be appreciated that the entire die assembly, hereinbefore described, may be raised and lowered by operation of the hydraulic cylinder 30 and its plunger 32 which is coupled to the plate 36 carrying the T-head structures 44 of the pins 46 which support the

upper members

50 and 52.

It will be appreciated that each pin 46 is provided with a head or nut 47 at the lower, hinge portions of the members 50 and that the T-head portions 42 of the bolts 46 are movable longitudinally of the T-slot struc- We 42 in the p te 36 to t e y pe d the entire die assembly in connection with the plunger 32 of the hydraulic cylinder 30.

As shown in FIGS of the drawings, it will be seen that the horizontal members 76 of the die assembly are connected to the vertical members 54 by means of arcuate bearing members 78 which are connected to the members 76 and extend into arcuate slots 80 of the vertical corner members 54.

A radial center of the arcuate bearing members '78 in each corner of the die assembly 34 coincides with an edge 82 of an angularly mitered end portion 84 of each member 76 thereby permitting collapsible movement of the vertical corner posts 80 and the horizontal member 76 into the broken line positions shown in FIG. 5 of the drawings.

The arcuate bearing structure 78 is similar to other bearing structure which will be hereinafter described in connection with various folding structures of the machine of the present invention.

Fixed to the underside of the main forming plate 26, are opposed brackets 86 and 88 having horizontal slots 90 and 92, respectively.

Disposed slidably in the slot 90 are pins 94 and 96 which are coupled to an arm 98 having a pivot pin 100 coupled to a plunger 102 of a hydraulic cylinder 104. The opposite end of the hydraulic cylinder 104 is pivotally mounted by means of a pin 106 to the arm 88 which is connected to pins 108 and 110 slidably mounted in the slot 92 of the bracket 88.

Pivotally connected to the pins 94 and 108 are links 112 and 114 carrying pivot pins 116 and 118, respectively. These pivot pins 116 and 118 pass through brackets 120 and 122 fixed to forming

plates

124 and 126 which are pivotally connected to opposed edges 128 and 130 of the main forming plate 26.

The pivotal connection of the forming plate 124 with the main forming plate 26 is similar to the pivotal connection of the forming plate 126 with the main forming plate 26. Therefore, reference is made to FIG. 3 of the drawings showing a pivotal connection of the forming plate 124 with the forming plate 26. FIG. 3 discloses the forming plate 124 by solid lines in horizontal position and by broken lines in vertical position while FIGS. 1 and 2 of the drawings disclose the forming plate 124 in vertical position by broken lines.

As shown in FIGS. 2 and 3 of the drawings, bearing blocks 131 are fixed to a lower surface 132 of the main forming plate 26 and these bearing blocks 131 are provided with arcuate slots 134 therein, also shown in FIG. 4 of the drawings. Fixed to the forming plate 124 are plates 136 carrying arcuate members 138 which are fitted into the slots 134 in order to provide a pivotal bearing of the forming plate 124 about an edge corner 140 of the forming plate 26. A complemental corner 142 of the forming plate 124 also pivots about a center coinciding with the radial center of the arcuate slot 134 of the arcuate member 138. Thus, the pivotal axes of the plate 124 at its edge 142 is about the edge 140 of the plate 26. at its upper surface 28.

It will be seen that the plates 136 carried by the forming plate 124 support the bearing members 138 in opposed relationship to each other and in the slots 134 of the members 131 so that the plate 124 cannot shift laterally of the plate 26.

The

plates

124 and 126 are thus pivotally connected to opposite edges 128 and 130 of the main forming plate 26.

Pivotally connected to the forming plate 124 along its opposite edges at right angles to an adjacent edge of the main forming plate 26 are flange forming plates 144and 146. These

plates

144 and 146 are connected to the forming plate 124 by hearing structures similar to that herein-- before described and disclosed in FIGS. 3 and 4 of the. drawings, reference being made to FIGS. 1 and 2 of the. drawings. It will be seen that the

flange forming plates

144 and 146 are connected respectively by hearing

assemblies

148 and 150 which are opposed to each other in a similar manner to the bearings hereinbefore described comprising the

parts

131, 136, and 138 which pivotally connect the forming plate 124 to the forming plate 126, as hereinbefore described. Thus, a pair of forming

plates

144 and 146 are pivotally connected to opposite edges of the forming plates 124 at right angles to the pivotal axes of the plate 124 at its connection with the main forming plate 26. Likewise, bearing assemblies 152 and 154 pivotally connect

flange forming plates

156 and 158 to each opposite edge of the forming plate 126, said

flange forming plates

156 and 158 being pivotally mounted on axes at substantially right angles to the pivotal axis of the plate 126 in its pivotal relationship with the main forming plate 26.

At free edges of the forming

plates

124 and 126, additional

flange forming plates

160 and 162 are pivotally mounted to pivot on the free edges of the forming

plates

124 and 126 on axes substantially parallel to the pivotal axes of the forming

plates

124 and 126 relative to the main forming plate 126.

As shown in FIG. 2 of the drawings, bearing assemblies 164 are disposed pivotally to interconnect the plate 124 and the flange forming plate 160 and these bearing assemblies 164 are similar to the bearing assemblies hereinbefore described in connection With FIGS. 2, 3, and 4 of the drawings. Similar bearing assemblies pivotally connect the forming plate 126 and the flange forming plate 162, the operation of which will all be hereinafter described in detail.

Pivoted to opposite edges 165 and 166 of the main forming plate 26 are

flange forming plates

168 and 170. These

flange forming plates

168 and 170 are pivoted to the main forming plate 26 by means of bearing assemblies 172 and 174 which are similar to those described in connection with FIGS. 2, 3, and 4 of the drawings. Thus, the

flange forming plates

168 and 170 are pivotally mounted about horizontal axes at right angles to the pivotal axes of the forming

plates

124 and 126 in their pivotal connection with the main forming plate 26.

The flange forming plate 168, at its opposite ends 173 and 175, is spaced from respective edges 128 and 130 of the main forming plate 26 suflicient distances to provide for the forming of a folded corner structure, as will be hereinafter described. Likewise, opposite ends 176 and 178 of the flange forming plate 170 are spaced from opposite edges 128 and 130 of the main forming plate 26, all as will be hereinafter described in detail.

A pair of

hooks

180 and 182 are fixed to the flange forming plate 160 and are disposed to hook over a flange member 184 on the upper portion of the plate 36 to hold the forming plate 124 in juxtaposition relative to the collapsible die assembly 34. When forming, pressure is applied to actuate the

flange forming plates

144 and 146 about the axes of their

hearing structures

148 and 150.

Hooks 186 are coupled to the flange forming plate 162 and function in substantially the same manner as the hooks 182, hereinbefore described.

Fixed to the forming

plates

124 and 126 by means of

brackets

188 and 190 are

hydraulic cylinders

192 and 194 having

plungers

196 and 198 pivotally connected to the

flange forming plates

144 and 146, respectively. Additionally,

similar cylinders

200 and 202 are mounted on the

plates

124 and 126 to pivotally actuate the

flange forming plates

146 and 158, all as shown best in FIGS. 1 and 5 of the drawings.

The

flange forming plates

160 and 162 are pivotally actuated by

plungers

204 and 206 of

hydraulic cylinders

208 and 210, respectively, which are mounted by means of

brackets

212 and 214 on the forming

plates

124 and 126, respectively.

A pair of cylinders 216 and 218are mounted by means of

brackets

220 and 222 to the under side of the main forming plate 26. These cylinders 216 and 218 are provided with respective plungers 224 and 226 pivotally con- 6 nected by links to the flange forming plates 168 and for pivotally actuating them about horizontal axes at opposite edges of the main forming plate 26, said last mentioned edges being disposed at right angles to the edges 128 and 130, hereinbefore described.

As shown in FIG. 1 of the drawings, brackets 228 and 230 are mounted on the forming plate 126, these brackets 228 and 230 support

hydraulic cylinders

232 and 234 near upper and lower edges, respectively, of the flange forming plate 56. It will be seen that the hydraulic cylinder 234 is provided with a plunger 236 disposed to engage an outer side of the flange forming plate 56 when pivoted into a broken line position shown in FIG. 5 by the cylinder plunger 198 of the cylinder 194. The bracket 230 thus supports the hydraulic cylinder 234 so that the flange forming plate 56 is readily pivotally movable inwardly of the plunger 236 when in retracted position. The hydraulic cylinder 232 is provided with a similar cylinder, similarly disposed with respect to an upper portion of the flange forming plate 56. The plungers of these

cylinders

232 and 234 being disposed to engage the flange forming plate 56 near upper and lower ends thereof and near upper and lower ends of the die assembly 34 in order to fold corner structures of a sheet metal evaporative cooler structure, all as will be hereinafter described in detail. Thus, a pair of the

hydraulic cylinders

232 and 234 is utilized to forcefully actuate the flange forming plate 56 into a position at right angles to the plate 126 after initial movement of the flange forming plate 56 by the plunger 198 of the hydraulic cylinder 194, as hereinbefore described.

A pair of hydraulic cylinders 238 are supported by brackets 240 similar to the brackets 228 and 230 and these cylinders 238 are provided with plungers 242 disposed to engage the flange forming plate 158 in its broken line position by the hydraulic cylinder 202, hereinbefore described.

Hydraulic cylinders 244, shown in FIG. 5 of the drawings, but not shown in FIG. 1 of the drawings, is provided with a plunger 245 adapted to engage the flange forming plate 244 in its broken line position after having been actuated into such position by the hydraulic cylinder 192. Two of the cylinders 244 are disposed in positions comparable to the

hydraulic cylinders

232 and 234 and thus, provide closing force for actuating the flange forming plate 144, all as will be hereinafter described in detail.

The hydraulic cylinders 244 are mounted on brackets 246 carried by the forming plate 124.

Brackets 248 are mounted on the plate 124 and carry a pair of hydraulic cylinders 250 having plungers 252 which engage the outer side of the flange forming plate 146 when moved into the broken line position shown in FIG. 5. Thus, the plungers 252 engage the plate 146 after it has been actuated into the broken line position by the hydraulic cylinder 200, all as shown best in FIG. 5 of the drawings.

Thus, as shown in FIGS. 1, 2, and 5 of the drawings, there are a pair of the cylinders 244 disposed to actuate their plungers 245 into engagement with the flange forming plate 144 and there are a pair of the hydraulic cylinders 250 having plungers 252 disposed to engage the flange forming plate 146.

A motor 254 drives a pump 256 which forms a hydraulic pressure fluid system to actuate all of the hereinbefore mentioned hydraulic cylinders, in accordance with the action of solenoid valves communicating with these cylinders and with electrical switches disposed to actuate such valves in proper sequence to motivate the various forming plates and flange forming plates of the machine, as well as the expandable and contractable die assembly 34.

Communicating with the hydraulic cylinder 30 are a pair of hydraulic flow rate valves 258 and 260 which are conventional valves disposed to control the rate of flow into and out of the cylinder 30. These valves are also provided with conventional bypass check valves in opposite directions. Another .check valve 262 communicates with the cylinder 30 and is provided with a solenoid opening device 264 so that the plunger 32 of the cylinder 30 may be held in its upward position by hydraulic fluid until the actuator 264 opens the check valve 262 during respective flow through a control solenoid valve 266 communicating with the cylinder 30. This valve 266 is provided withelectrical connections 268 and 270 coupled in the conventional manner to a relay 272 operable by a pair of switches 274 which are contacts of a conventional stepping switch disposed to carry the operation of the present machine through a cycle in which various hydraulic cylinders are actuated to be energized or deenergized in sequence.

The hydraulic cylinder 70 is a two-way cylinder powered in both directions through rate valves 276 and Y278 controlled by a solenoid valve 280 having

electrical connections

282 and 284 coupled to a relay 286 having stepper switch contacts 288 in connection therewith.

The hydraulic cylinders 216 and 218 communicate with

flow rate valves

287 and 289 which control the rate of operation of the plungers of these hydraulic cylinders. These cylinders are double ended cylinders having one end communicating through a conduit 290 and a solenoid valve 292 while

hydraulic cylinders

208 and 210 have double acting plungers also communicating with the conduit 290 and the solenoid valve 292. It will be seen that a time delay valve 294 communicates with the cylinders 216 and 218 to cause subsequent operation of the cylinders.216 and 218 to the operation of the

cylinders

208 and 210 having communication through rate valves 296 and 298 directly with the solenoid valve 292.

Electrical connections 300 and 302 are coupled to a relay 304 shown in FIG. which is controlled by a pair of stepper switch contacts 306.

The cylinder 104 is a double ended cylinder communicating with a solenoid valve 308 having electrical connections 310 and 312 in connection with the relay 314 shown in FIG. 10 of the drawings. This relay 314 is controlled by a .pair of stepper switch contacts 316.

The '

hydrauic cylinders

232, 234, 238, 244, and 250 are controlled by means of a solenoid valve 318 having electrical connections 320 and 322 coupled in the conventional manner to a relay 324 controlled by stepper switch contacts 326, all as shown in FIGS. 9 and 10 of the drawings.

The

cylinders

192, 194, 200, and 202 are provided with respective rate control valves 32 8, 330, 332, and 334 in connection with a solenoid valve 336 having

electrical connections

338 and 340 coupled to a relay 342 in connection consecutively actuated in timed relationship with each other so that the various cylinders will operate in the sequence, as will be hereinafter described.

The machine of the present invention is arranged, initially, to receive a flat sheet of metal A, shown in FIG. 1 of the drawings, and this flat sheet of metal A is laid horizontally upon the forming plate 26 and the forming

plates

124 and 126 all in horizontal alignment when the

plates

124 and 126 are in the broken line position shown in FIG. 1 of the drawings. With reference to FIG. 6 of the drawings, it will be seen that the plate 26 is thus disposed between the

plates

124 and 126 and that the

plates

124 and 126 are pivotally connected to the plate 26 about pivotal axes B and C which are at right angles to a pivotal axes line D passing through the hinge axes of the

flange forming plates

144, 168, and 156. It will be seen that opposite ends 173 and 175 of the flange forming plate 168 are spaced from adjacent ends of the

flange forming plates

144 and 156, respectively, and also the

ends

173 and 175 are spaced from the pivotal axes B and C, respectively, on which the forming

plates

124 and 126 are pivotally connected to the main forming plate 26.

The flange forming plate 160 and likewise, the flange forming plate 162, not shown in FIG. 6 of the drawings, are pivotally mounted on axes E, substantially parallel to the pivotal axes B and C at which the

plates

124 and 126 are pivotally mounted on the main forming plate 26.

It will be noted that an outer end 161 of the flange forming plate 160 and a similar end of the plate 162 must be substantially flush with an outer edge of the flange forming plate 144 and a similar edge of the flange forming plate 156.

With reference to FIG. 8 of the drawings, it will be seen that the product manufactured by the machine of the invention comprises a sump pan structure 346 integral with a frame side 348 and integral with a top pan section 350 which is normally inverted in use. This structure all being shown in the position ,in which it is produced on the machine, shown in FIG. 1 of the drawings.

The sides 352 of the pan 346 align with flanges 354 of the side 348 and sides 356 of the inverted pan-shaped structure 350 are substantially aligned with the flanges 354 of the plate 348.

Accordingly, it will be appreciated by those skilled in the art that the angular folded portions 357 at the corners of the sump pan 346 must be formed substantially concurrently with folded portions 358 at a juncture between the sidewall portion 352 and the flange portion 354. Also, the sides 356 of the inverted pan structure 350 must also be formed substantially concurrently into a folded corner connection 370 which is integral with the flanges 354 and :the sides 356, all as hereinbefore described.

Attention is directed to FIG. 7 of the drawings, wherein the corner folded

portions

356 and 358 are being produced.

In operation, of the machine, the hydraulic cylinder 30 is first energized to lower the die assembly 34, as hereinbefore described, so that it rests on the upper surface of the sheet metal plate A, holding it securely downward on the upper surface of the forming plate 26. In this position, the cylinder 70 is then energized to extend the collapsible and expandible die 34 to its solid linefull scale position, as hereinbefore described. The cylinder 104 is then energized to raise the

flange forming plates

124 and 126 about their pivotal axes B and C into the solid line position shown in FIG. 1 of the drawings. The

cylinders

208 and 210 are then energized to latch the latch members 182 and 186 and also to move the flange forming plates and 162 into the broken line position shown in FIG. 1 to fold the upper edges of the plate A at right angles to form

flange portions

372 and 374, respectively, at right angles to the planes of the pan structure 350 and the sump pan structure 346.

The ends 173 and 175 and .the

ends

176 and 178 of the

flange forming plates

168 and 170, respectively, as these plates are moved upward by the cylinders 216 and 218, provide fold lines to initiate corner folds 376 at said opposite ends 173 and 175. Almost concurrently, but slightly following, the

flange forming plates

144, 146, 156, and 158 are pivoted inward by their respective cylinders to cause the sides 352 of the sump pan 346 to be formed and concurrently to move the sides 356 of the top pan 350 into corresponding position. This folding at the

corner portions

356 and 358 being shown specifically in FIG. 7 of the drawings, as the vertically disposed flange forming plates move the metal toward one of the corner posts'54 of the die assembly 34.

In this relationship, the edge 145 of the flange forming member 144, as for example, passes into parallelism with the end 173 of the flange forming plate 168 thereby permitting the folded corner structure 370 and the corner folded structure 376 to be formed. correspondingly, the remaining corner structures are formed in the same manner.

After all of the

flange forming plates

144, 146, 156 and 158 have been folded into close proximity with respective corner posts 54, the

respective hammer cylinders

244, 250, 234, and 238 are energized to engage the outer sides of the

respective plates

144, 146, 156, and 158 to thereby exert pressure at the folded

portions

357, 358, 370, and 376, and corresponding folded portions on the opposite side of the machine so that these corners will be tightly folded and rendered very flat and neat.

It Will be noted that an end 157 of the flange forming plate 162 corresponds with the end 161 of the flange forming plate 160. This end 157 substantially overlies the hinge axis between the flange forming plate 162 and the forming plate 126. Thus, a fold portion 378 of the folded section 357, is forced to move under the flange forming plate 157 and thereby causes the fold to take place at the proper angular position in order that the folded portion 378 becomes flush with the corner of the sump pan 346 and substantially in' alignment With the side 374, hereinbefore described. It will be appreciated that the vertical edge 155 of the flange forming plate 156 passes into a plane in alignment with the end 175 of the flange forming plate 168 and thus, these plates are substantially flush when the structure, shown in FIG. 8, is finally formed by the machine.

Attention is again called to the diagrammatic showing in FIG. 6 where opposite ends of the flange forming plate 166 are spaced from the pivotal axes of the

plates

124 and 126 which are pivotally connected to the main forming plate 26 and that the outwardly extending ends 161 and 157 of the

flange forming plates

160 and 162, respectively, are extended outwardly and beyond the pivotal axes D of the

flange forming plates

144 and 156. This is also true of the complemental structure on the opposite side of the machine at opposite edges of the

respective plates

124, 26, and 126.

It will be obvious to those skilled in the art that various modifications of the present invention may be resorted to in a manner limited only by a just interpretation of the following claims.

We claim:

1. In a machine for forming a one piece, generally C-shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side which is provided with angularly disposed flanges, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates having first edges pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly and at substantially right angles to said first plate; power operated means disposed, pivotally, to actuate said second and third forming plates relative to said first forming plate; a pair of first flange forming members pivoted to each one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to said respective first edges; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said first edges which are pivoted to opposite edges of said first forming plate; opposite ends of said second flange forming members extending beyond the pivotal axes of said first flange forming members a distance equal to the width of a flange to be formed adjacent said first flange forming members; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates.

2. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side which is provided with angularly disposed flanges, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates having first edges pivoted about opposite edges of said first forming plate into position-s at opposite sides of said die assembly and at substantially right angles to said first plate; power operated means disposed, pivotally, to actuate said second and third forming plates relative to said first forming plate; a pair of first flange forming members pivoted to each one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to said respective first edges; 2. second flange forming member pivotally mounted on each of said sec-0nd and third forming plates at free edges of said plates opposite to said first edges which are pivoted to opposite edges of said first forming plate; opposite ends of said second flange forming members extending beyond the pivotal axes of said first flange forming members a distance equal to the width of a flange to be formed adjacent said first flange forming members; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; third flange forming members pivoted about opposite edges of said first forming plate and disposed at right angles to edges thereof about which said second and third forming plates are pivoted; opposite ends of said third flange forming members spaced a distance from a pivotal axis at a respective one of said first edges; said distance substantially equal to the width of a flange to be formed adjacent a respective first flange forming member.

3. In a sheet metal forming machine for forming panshaped structures and integral plate sections connected therewith and having opposed flanges forming a juncture with corners of the pan-shaped structures, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a die assembly adjacent to said first plate; said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; a second forming plate having a first edge pivoted about one of said opposite edges of said first forming plate and into a position adjacent to one side of said die assembly; power operated means disposed pivotally to actuate said second forming plate relative to said first forming plate and said die assembly; a first flange forming member pivoted to said second forming plate about an edge thereof disposed at substantially right angles to said first edge; a second flange forming member pivotally mounted on said second forming plate at an edge thereof parallel to said first edge which is pivoted to one of said opposite edges of said first forming plate; means on said second forming plate disposed to pivot said flange forming members relative to said second forming plate; an end of said second flange forming member extending beyond the pivotal axis of said first flange forming member a distance equal to the width of a flange to be formed adjacent said first flange forming member.

4. In a sheet metal forming machine for forming panshaped structures and integral plate sections connected therewith and having opposed flanges forming a juncture with corner-s of the pan-shaped structures, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a die assembly adjacent to said first plate; said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; a second forming plate having a first edge pivoted about one of said opposite edges of said first forming plate and into a position adjacent to one side of said die assembly; power operated means disposed pivotally to actuate said second. forming plate relative to said first forming plate and said die assembly; a first flange forming member pivoted to said second forming plate about an edge thereof disposed at substantially right angles to said first edge; a second flange forming member pivotally mounted on said second forming plate at an edge thereof parallel to said first edge which is pivoted to one of said opposite edges of said first forming plate: means on said second forming plate disposed to pivot said flange forming member relative to said second forming plate; an end of said second flange forming member extending beyond the pivotal axis of said first flange forming member a distance equal to the width of a flange to be formed adjacent said first flange forming member; a third flange forming member pivoted about an edge of said first forming plate disposed at right angles to said one of said opposite edges thereof about which said second forming plate is pivoted; one end of said third flange forming member spaced a distance from the pivotal axis of said second forming plate; said distance substantially equal to the width of a flange to be for-med adjacent said first flange forming member.

5. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges.

6. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; and a pair of further flange forming membersv pivoted to the. other of s 12 second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges.

7. In a machine for forming a one piece, generally C- shaped, evaporating cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; a pair of further flange forming members pivoted to the other of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; third flange forming members pivoted at opposite edges of said first forming plate and disposed at right angles to edges thereof about which said second and third forming plates are pivoted.

8. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; means for pivoting said second and third form plates relative to said frame and said first form plate, comprising a hydraulic cylinder having an extendible plunger; rectilinear guide means parallel to said first form plate for guiding said cylinder and said plunger; means coupled to said cylinder and said plunger movable relative to said rectilinear guide means and links coupled to said last mentioned means and said second and third form plates for pivoting them relative to said first form plate.

9. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; a pair of third flange forming members pivoted to the other of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; hydraulic cylinder means carried by said one of said second and third form plates, said hydraulic cylinder means coupled to a respective one of said flange forming members for pivoting it relative to a respective form plate.

10. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at oppositeedges thereof which are disposed at substantially right angles to a respective one of said free edges; pivotal connection means between said form plates and said flange forming members; each connection means comprising adjacent corners of relatively pivoted members having a pivotal axis in the proximity of said adjacent corners; meshing arcuate track and groove structure having a center disposed at said axis and radially spaced therefrom, said arcuate groove structure coupled to one of said relatively pivotally members, said arcuate track structure coupled to the other of said relatively pivotal members.

11. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at oppositeedges thereof which are disposed at substantially right angles to a respective one of said free edges; pivotal connection means between said form plates and said flange forming members; each connection means comprising adjacent corners of relatively pivoted members having a pivotal axis in the proximity of said adjacent corners; meshing arcuate track and groove structure having a center disposed at said axis and radially spaced therefrom, said arcuate groove structure coupled to one of said relatively pivotal members, said arcuate track structure coupled to the other of said relatively pivotal members; whereby sheet metal may be formed and bent contiguous with said adjacent corners of said relatively pivotal members while said pivotal connection means is spaced radially away from said adjacent corners and said sheet metal.

12. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; said generally box-shaped expandible and contraotible die assembly comprising four corner members disposed at substantially right angles to said first form plate; toggle mechanism between said corner members and coupled thereto for projecting them toward and away from each other to extend and contract them to vary the extended dimensions of the generally box-shaped structure of said die assembly.

13. In a machine for forming a one piece, generally C- shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said d-ie assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; said generally box-shaped expandible and contractible die assembly comprising four corner members disposed at substantially right angles to said first form plate; toggle mechanism between said corner members and coupled thereto for projecting them toward and away from each other to extend and contract them to vary the extended dimensions of the. generally box-shaped structure of said die assembly; a second frame coupled to said first means and supporting said corner members and said toggle mechanism.

14. In a machine for forming a one piece, generally C-shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a sec ond flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; said generally box-shaped expandible and contractible die assembly comprising four corner members disposed at substantially right angles to said first form plate; toggle mechanism between said corner members and coupled thereto for projecting them toward and away from each other to extend and contract them to vary the extended dimensions of the generally box-shaped structure of said die assembly; a second frame coupled to said first means and supporting said corner members and said toggle mechanism; said first means comprising a hydraulic cylinder means interconnecting said main frame and said second frame.

15. In a machine for forming a one piece, generally C-shaped, evaporative cooler frame having upper and lower pan sections integral with one vertical side, the combination of: a main frame; a rectangularly shaped first forming plate having opposite edges; a generally box-shaped expandible and contractible die assembly, said plate and said die assembly mounted on said frame; first means carried by said frame and disposed to cause relative movement between said plate and said die assembly to vary the spaced relation thereof; rectangularly shaped second and third forming plates pivoted about opposite edges of said first forming plate into positions at opposite sides of said die assembly; power operated. means disposed pivotally to actuate said second and third forming plates relative to said first forming plate; a second flange forming member pivotally mounted on each of said second and third forming plates at free edges of said plates opposite to said edges which are pivoted to opposite edges of said first forming plate; means on said second and third forming plates disposed to pivot said flange forming members relative to said second and third plates; and a pair of first flange forming members pivoted to one of said second and third forming plates at opposite edges thereof which are disposed at substantially right angles to a respective one of said free edges; said generally box-shaped expandible and contractible die assembly comprising four corner members disposed at substantially right angles to said first form plate; toggle mechanism between said corner members and coupled thereto for projecting them toward and away from each other to extend and contract them to vary the extended dimensions of the generally box-shaped structure of said die assembly; a second frame coupled to said first means and supporting said corner members. and said toggle mechanism; said first means comprising a hydraulic cylinder means interconnecting said main frame and said second frame; rectilinear guide means parallel with the axis of said hydraulic cylinder and slidably coupling said main frame and said second frame.

References Cited by the Examiner UNITED STATES PATENTS 430,835 6/1890 Codding et a1. 153-17 1,323,143 11/1919 Abbot l5318 2,557,346 6/1951 Green 153-l8 XR CHARLES W. LANHAM, Primary Examiner.

WILLIAM J. STEPHENSON, Examiner.

Claims

1. IN A MACHINE FOR FORMING A ONE PIECE, GENERALLY C-SHAPED, EVAPORATIVE COOLER FRAME HAVING UPPER AND LOWER PAN SECTIONS INTEGRAL WITH ONE VERTICAL SIDE WHICH IS PROVIDED WITH ANGULARLY DISPOSED FLANGES, THE COMBINATION OF: A MAIN FRAME; A RECTANGULARLY SHAPED FIRST FORMING PLATE HAVING OPPOSITE EDES; A GENERALLY BOX-SHAPED DIE ASSEMBLY, SAID PLATE AND SAID DIE ASSEMBLY MOUNTED ON SAID FRAME; FIRST MEANS CARRIED BY SAID FRAME AND DISPOSED TO CAUSE RELATIVE MOVEMENT BETWEEN SAID PLATE AND SAID DIE ASSEMBLY TO VARY THE SPACED RELATION THEREOF; RECTANGULARLY SHAPED SECOND AND THIRD FORMNG PLATES HAVING FIRST EDGES PIVOTED ABOUT OPPOSITE EDGES OF SAID FIRST FORMING PLATE INTO POSITIONS AT OPPOSITE SIDES OF SAID DIE ASSEMBLY AND AT SUBSTANTIALLY RIGH ANGLES TO SAID FIRST PLATE; POWER OPERATED MEANS DISPOSED, PIVOTALLY, TO ACUTATE SAID SECOND AND THIRD FORMING PLATES RELATIVE TO SAID FIRST FORMING PLATE; A PAIR OF FIRST FLANGE FORMING MEMBERS PIVOTED TO EACH ONE OF SAID SECOND AND THIRD FORMING