US2480860A

US2480860A - Apparatus for bending a curled metal edge around a reinforcing wire

Info

Publication number: US2480860A
Application number: US602637A
Authority: US
Inventors: Everett M Hunt
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-06-30
Filing date: 1945-06-30
Publication date: 1949-09-06
Anticipated expiration: 1966-09-06

Description

Sept. 6, 1949. E. M. HUNT 2,480,860 APPARATUS FOR BENDING A CURLED METAL EDGE AROUND A REINFORCING WIRE Filed June 50, 1945 3 Sheets-Sheet I i l \e |s INVENTOR F|6. g EVERETT M. HUNT ATTORNEY Sept. 6, 1949. E. M. HUNT 2,430,850

APPARATUS FOR BENDING A CURLED METAL EDGE AROUND A REINFORCING WIRE Filed June so, 1945 3 Sheets -Sheet 2 FIG. 3.

63 32- W /1 WA y k\\\ 62 6| 69 I FIG. 5. 32

I Z {O I 58 3| v L INVENTOR L EVERETT M.,HUNT

40.7 I BY W I [AA-J ATTORNEY p 1949. E. M. HUNT APPARATUS FOR BENDING A CURLED METAL EDGE AROUND A REINFORCING WIRE 3 Sheets-Sheet 3 Filed June 50, 1945 FIG. 6.

FIG.

INVENTOR EVERETT I M. HUNT ATTORNEY Patented Sept. 6, 1949 APPARATUS FOR BENDING A CURLED OFFI E METAL EDGE AROUND A REINFORC- ING WIRE Everett M. Hunt, Portsmouth, N. H.

Application June 30, 1945, Serial No. 602,637

(01.153-39) 7 (Granted under the act of March 3, 1883, as

6 Claims.

amended April 30, 1928; 370 0. G. 757) My invention relates to a forming machine. It has to do, more particularly, with a machine for bending the edge of a relatively thin section of metal around a reinforcing wire or rod of metal.

In producing metal articles from relatively thin sections of metal, it isdesirable to incorporate in the edge of the metal section, a reinforcing wire or rod of metal. To do this, it is necessary to bend the edge of the metal section around the reinforcing wire associated therewith so that the wire will be retained firmly in position.

The object of my invention is to provide a simple machine which is very efiective to form the edge of a relatively thin metal section around a reinforcing metal wire which is associated therev I 1 The embodiment of my invention disclosed in this application comprises a machine which is adapted to bend the edge of the flange or sidewall of a meta1 pan around a reinforcing wire or rod of metal. However, 'it'is to be understood that my invention is not limited to the manufacture of pans. v

In producing metal pans, such as large rectangular baking pans, the flange or sidewall is formed with a curled edge so that an open wirereceiving channel of hook-shape cross-section is provided which receives the wire and which must be bent around the wire to completely enclose it. My machine receives the partly formed pan with the wire in positionin the channel and by means of relatively movable cooperating metal shaping dies, the walls of the channel are bent around the wire in firm embracing relationship therewith.

The preferred embodiment of my invention is illustrated in the accompanying drawings wherein similar characters of reference designate corresponding parts and wherein:

Fig. 1 is a side elevational view of a machine constructed according to my invention.

Fig. 2 is a front elevational view of the upper portion of the machine shown in Fig. 1.

Fig. 3 is a top plan view, partly broken away, of the machine shown-in Figs. 1 and 2.

Fig. 4 is a vertical sectional view taken substantially along line 4-4 of Fig. 3.

Fig. 5 is a partial and view of my machine.

Fig. 6 is a vertical sectional view taken substantially along line 6-6 of Fig. 3 but showing the forming dies in their initial inoperative positions rather than as in Fig. 3.

Fig. 7 is a view similar to Fig. 6 showing the forming. dies in. their final operative positions as shown in Fig. 3.

Fig. 8, is an enlarged .detailin vertical section showing the forming dies intheir initial inoperative positions. 5 f

Fig. 9 is a View similarto Fig. 8 showing the forming dies in their final operative "positions.

With reference to the drawings, I have illustrated a machine which is designed to receive a metal pan I of square or rectangular form which may be a metal baking pan. The panis shown in inverted position in Figs. 6 to 9 and includes a flange or sidewall 2. The flange 2 has a turned edge 3 (Fig. 8) of hook -shape cross-section so as to form a channel 4 for receiving a reinforcing wire or rod 5 of metal. My machine is adapted to bend the hook-shape edge 3 around the wire 5 into tightly embracing relationship (Fig. 9) to the wire so as to retain it in position on the flange.

My machine, as shown best in Figs. 1 to 3, comprises a table 6 or other suitable support. This table includes the top plate I. which carries most of the mechanism of my machine. It also includes a supporting beam 8 which is suitably connected to the legs of the table adjacent their lower ends. The supporting beam 8 supports an upstanding cylinder and piston unit .9, at the center of the table, which is secured thereto by means of bolts 10. The fluid-actuated cylinder and piston unit 9 is controlled by a suitable valve unit H which is disposed in front of the table 6 and is actuated by a foot pedal 12. The valve II is connected to unit 9 by the lines l3 and I4. A source of fluid pressure is connected to valve l I by a line [5.

The piston rod l6 of unit 9 extends upwardly therefrom and has pivoted to itsupper end, as at H, the lowerend of a link l8. The opposite end of link I8 is pivoted within the yoke [9 (Fig. 3) formed on one end of a lever 20. The opposite or rear end of lever 20 is pivoted, as at '2l,' to an upstanding support 22 which isa part of and at the rear end of a U-shape support 23 secured to the upper surface of the plate 1. Within the U-shape support 23 is a large .aperture 24 formed inplate 1 to permit the proper movement of link l8 and lever 20. When piston rod I6 is in its uppermost position, the link 18 will be vertically disposed in substantial alignment with rod l6 and the lever 26 will be in slightly rearwardly inclined position, as indicated by the full lines in Fig. 1. When the piston rod [6 is in its lowermost position it'will be withdrawnpractically completely'within the'unit 9 andthe link It and lever 26 will 'be sharply inclined downwardly and forwardly as indicated. by the-dotted lines in Fig.1.

bead on the pan. The cross section of this channel is slightly greater than a semi-circle andits center is at the axis of rotation of the member 51. The die 63 may be removed and replaced quickly with a die-having a different size channel if reinforcing wire of a diiferent size is to beused. The radius of the channel will be that of the reinforcing wire plus the thickness of the metal of the flange of the pan. I

' In using my machine, the pan is inverted and placed over the inner die 41 in the manner indicated in Figs. 6 and 8. The die 4'! will be in its forwardmost position at this time so Ith'atthe flange of'the pan to be bent will have its hooked edge 3 resting on the shelf 45. 'At this time, the arms 55 will be in their rearwardmost position and the member 51 will have been rotated clockwise to the extent of its movement. The wire 5 will be in position in the channel 4 on the flange 2 of the pan l.

The pedal I2 is now actuated to cause the unit 9 to actuate the mechanism of my machine. This will swing the shaft 28 and arms 30 forwardly in the manner previously indicated. The shaft 3| will be rotated and, consequently, the eccentrics 33 will be rotated and they are so disposed on the shaft that a rear pull will be exerted on the links 34, causing the die 41 to move rearwardly towards the die 63. An instant after the die 41 is moved towards the die 63, the die 63 is rotated towards the die 41. This is accomplished by the shaft 28 which, when it is moved forwardly, engages the forward ends of slots 5| in arms 50 and thereby swings arms 55 forwardly. However, this movement is delayed until the movement of die 41 has started so that the rear edge of die 41 will reach the rear edge of shelf 45 before the die 63 acts on the edge 3 of the flange 2. This time interval may be adjusted by adjusting the bolts 53 on arms 50 and thereby, adjusting the effective lengths of the slots 5|.

As the die 41 moves rearwardly, the edge 3 of the flange of the pan will be slid rearwardly on the shelf 45 until it is completely oif the shelf. However, shortly before this happens the edge 3 of the flange is engaged by the hook-shape forming edge 68 of the die 63 and is bent forwardly around the wire 5. When the edge 3 is bent forwardly beyond the center of the wire 5, the hookshape formin edge 68 serves to draw the edge 3 into the channel 61 of the die 63. The die 4'! continues to move the flange 2 towards the die 63 which continues to rotate towards the flange and by the time the edge 3 slides off the shelf 45, the turned edge 3 is completely supported within the channel 61. The die 63 will continue to rotate until the edge 68 contacts the outer surface of the flange 2 as shown in Fig. 9, at which time the wire 5 will be firmly embraced by the turned edge 3. The die 41 reaches the extent of its rearward movement before rearward movement of links 34 is completed. As the links 34 continue to move rearwardly a pull will be exerted on the bolts 36, thereby causing the springs 40 to be compressed. This will ensure that the dies 41 and 63 will be firmly but yieldingly pressed towards each other during the formation of the flange of the pan disposed therebetween. Consequently, as the rotation of die 63 nears its final phase, it may move the die 41 forwardly slightly due to the yielding or resilient connection of plate 4| to links 34. The rear edge of plate 4| will not contact with the shelf 45 and thereby interfere with the yieding or resilient association of the dies 41 and 63 during the forming operation.

" WhenAthe-unit- 9 is actuated again to return the shaft 28 and arms 30 to. their rearwardmost positions, the member 51 will be rotated clockwise to its original position and the die 41 will be movedforwardly to. its original position. Due to the provision of slots 5| in arms 50, rotation of member:5l will be delayed for'an instant until the die'4'lstarts to move forwardly and exposes the shelf :45 for supporting the flange 2 of the pan. The die carrying. member 51 is provided with a cutaway lower edge 69 (Fig. 6) extending the full lengthethereof, to prevent interference with the lower corner of the rear edge of shelf 45 as the member :5? is'rotated to its original position.

It will be apparent from theabove description thatuI-haveprovided asimple machinewhich is very effective to form the edge of a relatively thin section of'metal around a reinforcing metal wire or rod. As previously indicated, this invention is :not limited to the manufacture of pans but a pan hiSib6E11;ll-Sd merely as one example of work upon which this machine can be used.

.The inven'tion described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalty thereon or therefor.

What I claim is:

1. A metal forming machine for use on a metal section having a curled edge with a reinforcing wire disposed therein, comprising a structural framework including a shelf for supporting said curled edge, a supporting die for engaging the surface of the metal section opposite the curled edge, said die being movable relative to the edge of said shelf, a forming die disposed along the edge of said shelf, said supporting and forming dies being supported upon said structural framework, said forming die having a hook-shape forming edge along the side of an edge-receiving and forming channel which is formed therein, means for moving said supporting die towards the edge of said shelf, said moving being operative to bring the curled edge into association with said forming die, means for rotating said forming die towards said supporting die, and means operative during the rotation of said forming die to cause the hookshape forming edge thereof to swing towards and engage said curled edge and to draw it into said channel as it bends it around the wire, means including the movement of said supporting die for pushing said curled edge off said shelf, said curled edge being drawn into said channel before said curled edge is pushed off said shelf.

2. A structure according to claim 1 wherein said moving means for the dies includes a yielding connection so that the dies will yieldingly cooperate with each other.

3. A structure according to claim 1 wherein means is provided for causing the means for moving the supporting die towards the edge of said shelf to function shortly before the means for rotating the forming die.

4. A metal forming machine for use on a metal section having a curled edge with a reinforcing wire disposed therein comprising a structural framework including a shelf for supporting said curled edge, a supporting die for engaging the surface of the metal section opposite the curled edge, said die being movable relative to the edge of said shelf, a forming die disposed along the edge of said shelf, said supporting and forming dies being supported upon said structural frame, said forming die having a hook-shape forming edge along the side of an edge-receiving and forming channel which is formed thereintn roakable shaft attached to said structural frame. eccentrics associated with said rockahie shaft. means for moving said supporting die relative to the edge of said shelf, said means including links connected to said rockable shaft by means of Sitid eccentrics, means for rotating said forming (lie relative to said supporting die; said means includ ing rocking arms connected to said forming die. rocking arms for said shaft, and means-for making said die-actuating'arms and-said shaft actw ating arms, said last mentionedmeansincluding lost-motion linkage for delaying'actuationof said die-rocking arms relative to. actuation 01 said shaft rocking arms.

5. A structure according to claim 4 wherein said lost-motion linkage is adjustable tdvarythe time interval between actuation of the'die-rockin arms and the shafterocking arms.

6. A structure according to ciaim 4" wherein 29 8 REFERENCES CITED The following references are of record in the tile of this patent: