US3543558A - Culvert end section forming machine - Google Patents

Culvert end section forming machine Download PDF

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US3543558A
US3543558A US3543558DA US3543558A US 3543558 A US3543558 A US 3543558A US 3543558D A US3543558D A US 3543558DA US 3543558 A US3543558 A US 3543558A
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mandrel
arms
blank
frame
metal
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Lewellyn M Currier
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LEWELLYN M CURRIER
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LEWELLYN M CURRIER
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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
    • B21D19/00Flanging or other edge treatment, e.g. of tubes
    • B21D19/08Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • 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
    • B21D53/00Making other particular articles

Description

Dec. 1, 1970 E I 3,543,558
CULVERT END SECTION FORMING MACHINE Filed Sept. 4. 1968 2 Sheets-Sheet 1 :IIIIIIJ INVENT OR. Eh/ELL V/V ,(4. CUBE/5B 1970 L. M. CURRIER CULVERT END SECTION FORMING MACHINE 2 Sheets-Sheet 2 Filed Sept. 4. 196B INVENIOR. 1 511/524 4 4 M 2022/52 BY M,
3,543,558 CULVERT END SECTION FORMING MACHINE Lewellyn M. Currier, Box 63E, Rte. 1, Wayzata, Minn. 55391 Filed Sept. 4, 1968, Ser. No. 757,273 Int. Cl. B21d 11/04 US. Cl. 72-306 8 Claims ABSTRACT OF THE DISCLOSURE A metal forming machine in which a metal apron is formed from a sheet of metal on a mandrel through the use of bending arms and plates which roll and bend the metal plate against the mandrel. The mandrel is interchangeable for varying sizes of metal aprons.
My invention relates to metal forming machines and more particularly to an improved metal forming machine particularly adapted for the forming of culvert end sections or metal aprons.
Metal forming machines are well known and take a variety of forms. In the forming of metallic objects from flat metal plates, it is well recognized to use dies or equivalent structures upon which to form the desired part. Such machines are complex, bulky and do not lend themselves to ready interchangeability of dies to fabricate varying sizes of the metallic product. In addition, the power requirements for such machines and the complexity of the same do not lend such machines to ready interchangeability for varying sizes of desired end products.
The improved forming machine of the present invention is particularly adapted for the manufacture or forming of culvert end sections or metal aprons in which a thin, flat metallic plate is bent to form the desired end section or apron. This simplified forming machine utilizes a mandrel with bending and roller arms to bend the plate into the desired shape and permits the ready interchangeability on the machine of larger sized mandrels to permit the fabrication of varying sizes of the culvert end sections without altering of the power requirements or the actuators for the same. It further permits interchangeability of mandrels in a minimum amount of time and with a minimum amount of effort to substantially decrease operating cost for the machine.
Therefore, it is the principal object of this invention to provide an improved forming machine utilizing a mandrel construction for forming metal parts thereon.
Another object of this invention is to provide in a machine of this type, ready interchangeability of mandrel sizes for varying sized articles of manufacture.
A still further object of this invention is to provide a machine of this type which is easy to use, low in cost and easy to maintain.
These and other objects of this invention will become apparent from the reading of the attached description, together with the drawings wherein:
FIG. 1 is a plan view of the improved metal forming machine;
FIG. 2 is a side elevation view of the improved metal forming machine, with parts broken away, in the condition shown in FIG. 1;
FIG. 3 is a side elevation view of the improved metal forming machine with a blank metal plate inserted therein for the first step of the forming operation;
FIG. 4 is a perspective view of the rear end of the mandrel for the metal forming machine with its roller and bending arms in an operated condition;
FIG. 5 is a perspective view of the front end of the mandrel of FIG. 4;
States ate 3,543,558 Patented Dec. 1, 1970 FIG. 6 is a perspective view from the rear of the improved metal forming machine with parts broken away;
FIG. 7 is a plan view of the metal blank used in the forming of the articles on the meal forming machine; and
FIG. 8 is a perspective view of the finished metallic article or metal apron.
My improved metal forming machine, as shown in FIGS. 1, 2 and 3, is comprised basically of a base frame, indicated generally at 10, and generally polygonal in form. The base frame includes an upper table-like frame 12 and a plurality of depending legs 14 supporting the same. The legs 14 and upper frame 12 are preferably formed of angle iron, suitably connected together through means, such as welding, to provide a rigid base structure. Intermediate the upper frame part are a pair of angle iron beam members 16 suitably spaced from one another and connected to the edges of the upstanding frame through means such as welding, to serve as a support portion of the upper frame and to mount an actuator, as will be hereinafter defined. In addition, the upper frame part includes extensions 18 at one end thereof to mount a cylindrical support member 20 which journals and supports a mandrel support member comprised of a cylindrical sleeve 26 mounted on the support member 20 with an upstanding flange part 27 and an I beam member 28 suitably connected thereto, through means such as welding, and extending transverse of the sleeve part 26 to be disposed generally above and parallel to the table portion 12 of the base frame. The cylindrical sleeve member will pivot the support member on the pipe or cylindrical member 20 for movementrelative t0 the base frame. The upstanding part or frame 27 of the sleeve member 26 includes a pair of spaced arms 30 which serve to mount a mandrel 40 upon which the flat metal plates are to be formed. Also connected to the sleeve member 26 is a centrally located bifurcated latch member 32 which is secured to the sleeve member 26 through means such as welding.
The improved forming machine utilizes the mandrel 40 mounted on the I beam or mandrel support 28 for making or forming the culvert end sections or metal aprons thereon from metal sheets. For culvert end sec tions or aprons of varying sizes, this portion of the machine is changed and mandrels of different dimensions are used to form aprons of varying sizes. Such an apron is shown in perspective in FIG. 8 and the mandrel 40 is of the same shape since a fiat metal plate is positioned under the same and bent around the mandrel to form the metal apron. In outline or plan view, the mandrel and the apron describe a generally truncated conical structure whose forward or smaller extremity, indicated generally at 42, is cylindrical in form such that the apron will, at this extremity, be formed into a general cylindrical configuration to be connected to a cylindrical pipe section. The free or discharge extremity of the apron is flat with the sides thereof tapering from the flat extremity and with a downwardly extending flap at the flat extremity. Each of the mandrels are constructed with this outer surface and with the exteremity of the mandrel remote from the cylindrical end having a hinged flap or bending structure 44 thereon. Located within the mandrel and suitably connected to the outer forming walls thereof is a central sleeve member 46 which is generally rectangular in cross section and fits on the I beam portion 28 of the mandrel support to slida-bly mount the mandrel thereon. The rear, or flap bending end of the mandrel, has an interior flat surface with flange plates 45 which connect to the rigid arms 30 of the mandrel support through suitable pins 47 to secure the mandrel on this portion of the support. The hinged flap or bending structure 44 defines the rear extremity of the mandrel which is positioned on the mandrel support to be adjacent the journaling shaft or pipe section 20 of the frame and the sleeve portion 26 of the mandrel support. As will be hereinafter noted, the under surface of this flap bending structure carries a flange 117 by means of which an actuator may be connected to the bending flap for pivoting the same in the bending of the rear or discharge end of the apron.
Mandrel 40 at the upper or closed extremity of the same and forming a part of the cylindrical outline, carries a slidable plate 48 which is slidably mounted in U-shaped guide members 50 positioned in the outer frame. This portion of the mandrel, in addition to defining a generally cylindrical outline at the extremity of the same, is curved to present a generally semi-circular upper surface as will be seen in FIGS. 1, 4 and 6. A pair of flat plates 52, 53 are positioned on this upper surface of the mandrel mounting the guide portions 50 for the plate 48 with the plates 52, 53 mounting pivoted arms 55, 56, respectively, each having roller or bending members 60 at the extremities of the same. The radius of curvature of this portion of the upper surface of the mandrel is identical with the path of movement of the rollers, which are slightly spaced therefrom such as to grip the rolled edge of the plate to be formed thereon between the rollers and the mandrel surface and cause bending of the plate. The arms 55, 56 have rigid flange members 62 connected thereto, the extremities of which connect through a pair of levers 63, 64, respectively, mounted on the slidable plate 48. Thus, as the plate slides away from the closed extremity of the mandrel, the arms 55, 56 will pivot with the roller ends of the same being guided around the curved edge of the mandrel as the levers 63, 64 pull the flange members 62 of the arms down wardly.
As will be hereinafter identified, the flat plate, which is to be bent into the form of a metal apron or culvert end section, is positioned beneath the mandrel (see FIGS. 4, 6) such that the forward edges of the blank are positioned and gripped by the rollers and held against the surface of the mandrel. As the arms 55, 56 pivot, the roller extremities roll the edge of the plate against the surface of the mandrel forming the general cylindrical end section and the curved top peripheral surface of the same.
In addition to the rollers 60 on the arms which perform a bending function on one end of the plate blank for the metal apron, additional arms 70, 72 with bending flanges 73, 74, respectively, at the ends of the same and gripping portions 75, 76 formed integral therewith and spaced therefrom, engage the opposite edge or end of the plate blank to perform the remainder of the bending operation to define the discharge end of the apron by urging the same against the mandrel and bending the edges to define the general outline of the discharge portion of the metal apron. The arms 70, 72 are carried by a pivoted upstanding frame 80, which frame is pivoted on the arms 30 of the mandrel support member through suitable support pivots 82. A centrally located frame part 85 of this structure, which is formed integral with the outer edges of the same, mounts a tie bar member 90 whose opposite extremity is pinned to the slidable plate 48, as at 95. This will insure that the plate in the forward end of the mandrel and the upstanding frame part 85 carrying the arms 70, 72 will simultaneously be moved. An actuator, shown as of the hydraulic type and indicated at 100, has its shaft extremity 102 pivotally mounted on the inner surface of the mandrel, as at 103, with the cylindrical extremity of the same being pivoted on the central part 85 of the upstanding frame 80, as at 105. Energization of the hydraulic actuator through fluid flow to the same will cause the actuator shaft to extend, urging the pivoted frame about its pivots and moving the slidable plate 48 through the tie linkage 90 connected to the upstanding frame. The arms 70, 72 are mounted on sleeves 106, 107 slidably positioned on the outer portions of the upstanding frame and are connected thereto through snap type couplings 108 to removably mount the arms thereon. The sleeves slide on the upstanding frame until they engage pins 109, which are adjustably positioned therein in a plurality of apertures 111 to limit the slidable movement of the sleeves 106, 107 on the upstanding frame 80. This adjustment of the sleeve movement provides for a certain lost motion imparted to the arms and permitting a portion of the bending of the forward end of the apron before the bending surfaces engage the discharge end of the blank to bend the edges thereof against the mandrel 40. By adjusting the position of the pins 109, various degrees of movement are permitted between the arms and the upstanding frame before the bending action takes place, thereby adjusting the structure for varying sized mandrels and aprons to be formed thereon.
In addition to actuator which moves the upstanding frame to operate the slidable plate and pivot the roller arms 55, 56 as well as rock and pull on the bending arms 70, 72 to bend the lower or discharge end of the apron, an actuator is positioned on the beam members 16 of the frame and adapted to operate the flap bending portion 44 of the mandrel 40. The actuator 110 is pivoted at its body or cylinder extremity on the frame parts 16 of the base frame with the shaft extremity 112 carrying a bell-crank type linkage 115 having a portion connected to the flap bending structure 44 at a pivotal connection, indicated at 117, and a downwardly extending portion 118, which under certain conditions of operation will be pivoted toward and positioned between the bifurcated latch member 32 on the sleeve member 26 for the purpose of rotating the entire mandrel support structure and elevating the beam 28, to permit inserting and removal of apron blanks and bent apron forms, together with the removal of mandrels 40 for the interchange of the same to adjust the machine for varying sized apron construction operations.
The elevation view of FIG. 3 shows the mandrel 40 with the mandrel support in an elevated position. Under these conditions of operation, the shaft 112 of actuator 110 has been extended such that the crank extremity 118 is positioned between a bifurcated latch member 32 and pinned thereto. Subsequent retraction of the shaft 112 through energization of the actuator 110 elevates the entire mandrel support structure with the mandrel thereon by pivoting the same. This is the condition of operation of the machine necessary for insertion of a blank out of which a metal apron is to be formed. In FIG. 7, a blank is shown generally at 125, the blank being basically thin sheet metal of anywhere from 12. to 16 gauge galvanized steel. The blank has an arcuate recess 128 therein, which when formed around the mandrel, define the generally plane or cylindrical end surface. In addition, the sheet metal blank has rolled or tubing edges 130 extending along the sides of the same, which edges may be formed by splitting a piece of tubular metal and securing the same to the edge of the sheet through riveting or other means. The extremity of the blank opposite the recess is slotted, as at 132, which slotted portion will be bent down to form the lip portion of the metal apron.
In FIG. 3, the blank is inserted into the machine beneath the mandrel such that the rear edge of the same is disposed over the edge of the upper frame part with the notches or slots 132 therein coinciding with the edge of the upper frame portion so that the entire slotted portion may be bent down. The slotted portion of the blank will be positioned underneath the flap folding structure 44 of the mandrel, and the intermediate or spaced frame parts 16 will serve to support the blank beneath the mandrel in the elevated position. Energization of the actuator 110 to extend the shaft thereof, lowering the beam 28 of the mandrel support structure with the mandrel thereon down onto the frame, will follow the insertion of the blank. In this position, the beam 28, supporting the mandrel 40, will be disposed generally parallel to the intermediate frame member 16 of the upper frame part of the base and spaced therefrom. The mandrel will be disposed, centrally on the blank with the portion of the blank extending beyond the table and underneath the flap folding portion of the mandrel 44. The beam 2-8 is held in position relative to the frame base by means of a latch member 140 on the end of the beam which is engaged by a latch lever 142 on the frame,- the latter being pivoted up to engage the latch member 140 on the beam to secure the same in the spaced parallel relationship with the base. In this position, the pin will be removed from the latch member 32 of the sleeve member 26 Supporting the mandrel support structure, and the bell crank end extremity 118 of the flange will then be free to rotate as the actuator is energized to withdraw or move the shaft portion 112 within the confines of the cylinder. Energization of the cylinder or hydraulic actuator in this direction will cause the flap folding member 44 on the mandrel to pivot through the connection 117 of the flange 115. As the actuator shaft is retracted, the flange part is pivoted transverse to the mandrel, bending the slotted portion of the blank normal to the extent of the same. With this flap part of the apron formed, the edges of the blank are then raised around the surface of the mandrel to a point where the rollers 60 on the end of the arms 55, 56 will engage and hold the rolled edge or tubing portion of the blank. The rollers are recessed such as to fit around the rolled edge so that the blank will be held up against the sides of the mandrel. Similarly, the arms 70, 72 are positioned sothat the cam or bending portions 73, 74 thereon and the holding portions 75, 76 engage the opposite extremities of the blank. The blank must be manually deflected so that the grooved cam surfaces will fit over the rolled or tubular edge of the blank to hold the same.
In this position of operation, the actuator 100 is retracted, that is its shaft is within the confines of the actuator and the upstanding frame mounting the arms 70, 72 will be pivoted to a substantially normal position with respect to the base frame with the plate 48 on the end of the mandrel being extended out toward the peripheral edge of the same and the arms 55, 56 mounting the bending rollers 60 being disposed substantially normal to the extent of the plate 50. With the blank in this position and held in this manner and with the pins 109 in the upstanding frame 80 positioned for the particular size of apron to limit movement of the sleeves 106, 107 thereon, the actuator 100 is energized to extend the shaft 102 and displace or pivot the upstanding frame 80 moving the linkage 90 and the plate 48 connected thereto in response to actuator movement. This will cause downward movement of the plate initially, causing the arms 55, 56 to pivot around the curved extremity of the frame bending the pipe or tubular portion of the blank. As the upstanding frame is pivoted, the sleeves 106, 107 slide thereon until the pins 109 are engaged, at which point further movement of the upstanding frame 80 through the arms 70, 72 will tend to draw the sides of the blank held by the cam surfaces 73, 74 thereon upwardly and around the rear mandrel surface. The locus of pivot of the arms 70, 72 is such that the holding extremities of the arms 75, 76 will force the extremities of the blank outwardly and the cam surfaces 73, 74 will bend the same to define the overall apron shape. As the actuator is moved through its extreme of movement, the blank will bend into the form of a culvert end section or metal apron as defined by the mandrel shape through operation of the bending arms 70, 72 and rollers 60 on the rolling arms 55, 56 of the mandrel. During this condition of operation the actuator 110 will remain in its retracted posiiton with a flap folding member 44 held down, holding the slotted portion of the blank against the end of the frame or base.
The linear actuators 100, 110, used on the improved forming machine, are shown herein as of the hydraulic type. As a part of the machine, a power supply including an electric motor driving a pump and connected to a fluid reservoir provides a source of fluid power to the actuators which is controlled by bi-directional valves 162, 164 with suitable actuating handles 165 thereon to cause a reversal of flow through the valves to the ends of the actuators from the reservoir and the pump for bi-directional and selected movement. It will be understood, however, that any type of motive source may be utilized, preferably fluid, and that the motors may be of any type which will provide linear actuation.
FIG. 8 of the drawing shows the finished shape of the metal apron after bending on the forming machine to the shape of the mandrel. This finished blank requires riveting or other suitable connection to a cylindrical coupling member for the purpose of adding the final shape to the cylindrical end of the apron and additional end plates on the flap portion to provide a generally rectangular flap surface thereon. These will be added by other manufacturing operations apart from the forming machine.
In operation, the improved forming machine may be simply operated by the elevation of the mandrel support structure to a raised position, such as is shown in FIG. 3, for the insertion of a galvanized sheet metal blank 125 with recess 128 and slotted edges therein. The blanks normally would have the tubular edges applied thereto by rolling or by the addition of slotted tubular members secured thereto. With the blank inserted, the machine is actuated to a lowered position wherein the mandrel support structure is latched with respect to the base frame and the actuator 110 is released from the latch member 132. At this point, the energization of the actuator 110 in the opposite direction will bend the slotted flap in the blank as the initial step of forming the metal apron. Reversal in the direction of operation of the actuator 110 is effected by one or the other of the valves 162, 164 forming the controls from the hydraulic fluid source. With the flap portion of the apron bent, the rollers 60 will be placed around the tubular edge of the blank and the arms 70, 72 with the cams 73, 74 and holding edges 75, 76 thereon positioned to engage the roller edges of the blank for the bending operation to form the same around the mandrel. As the actuator 100 is energized, the arms 55, 56 will move to cause the rollers thereon to roll over the tubular edge of the plate blank drawing the same around the end of the mandrel and forming the general cylindrical and curved configuration at this extremity of the blank. Further movement of the actuator will cause the arms 70, 72 to draw on the edges of the blank bendng the same into the discharge end configuration of the tpron. With the bending operation complete, the actuator 100 is reversed, releasing the rollers and arms from the bent blank. Thereafter, the actuator 100 is reversed in its direction of operation, raising the flap bending flange and permitting the flange extremity 118 to be connected to latch member 32. Reversal of the actuator 110 at this point will cause the mandrel support structure to be elevated such that the blank may be removed from the mandrel and a new blank inserted for another operation. When it is desired to change mandrel sizes, a new mandrel is positioned on the I beam structure 28 of proper size for the desired shape and size of the metal apron. The new mandrel structure will be connected to the upstanding frame part at the arms 30 attached to the plates 45 thereof and the actuator 100 will be connected to the mandrel. Similarly, actuator 110 will be connected to the flap folding structure 44 thereof through the linkage 115. In addition, the tie bar 90 will be connected to the sliding plate 48 of the mandrel for actuation of the arms 55, 56 thereon and the pins 109 in the upstanding frame will be adjusted for the desired bending operation by the arms 70, 72 for the particular size of apron.
This simplified forming machine may be readily operated by one or two people in the construction of culvert end sections or metal aprons. The apparatus requires only two conventional actuators and a conventional power source which are easy to install and maintain. The change from one mandrel size to another is readily eifected to removal of the mandrel from the I beam portion and the insertion of a new mandrel thereon. This structure permits the forming of metal parts, such as aprons, in a simplified manner without complex machinery.
In considering this invention it should be remembered that the present disclosure is intended to be illustrative only and the scope of the invention should be determined by the appended claims.
What is claimed is:
1. A forming machine comprising a base member, a mandrel support member pivotally mounted on the base member, said mandrel support member including a journaling section at one end thereof connected to the base member for pivoting the support member thereon and a transversely extending support section, a mandrel mounted on the support section, said mandrel having a flat extremity and a curved extremity with a slidable plate mounted centrally in the curved extremity, a pair of forming arms pivotally mounted on the upper surface of the mandrel and having forming rollers at the ends of the same, linkage means connecting the forming arms to the slidable plate in the mandrel to cause the forming arms with rollers thereon to move along a path parallel to the curved extremity of the mandrel, pivoted arm means carried by a portion of the mandrel support member, said forming arms and said pivoted arm means being adapted to engage the edges of a flat metal plate to draw the plate around the mandrel, and motive means for pivoting the forming arms and for moving the pivoted arm means to form the blank around the mandrel.
2. The forming machine of claim 1 and including a pivoted fiat member at the fiat extremity of the mandrel operative to be pivoted against an edge of the flat metal plate to bend the fiat metal plate remote from the forming arms.
3. The forming machine of claim 2 in which the mandrel is slidably mounted on the support section and removable to permit substitution of varying sized mandrels.
4. The forming machine of claim 2 in which the mandrel support member includes a latch at one extremity cooperative with a latch part on the base frame to position the support member relative to the base frame during a forming operation and when released to permit pivotal movement of the mandrel support member relative to the base frame to remove a formed flat plate from the machine.
5. The forming machine of claim 2 and including second motive means attached to the base member and to the pivoted fiat member for pivoting the flat member in the bending of the edge of the flat plate.
6. The forming machine of claim 2 which also includes a pivoted frame part positioned on the mandrel support member and having detachable arms which grip the edges of the plate member and pull the edges toward the mandrel as the pivoted frame part is moved with movement of the motive means.
7. The forming machine of claim 6 and including a flange on the mandrel support member adapted to be selectively connected to the pivoted fiat member on the mandrel and the second motive means to pivot the support member and raise the mandrel for the removal and insertion of the metal plates.
8. The forming machine of claim 7 in which the motive means are bi-directional hydraulic actuators and include a hydraulic source and control valve means for selectively operating each of the motive means in the forming operation.
References Cited UNITED STATES PATENTS 3,103,243 9/1963 Senior 72-309 2,632,493 3/1953 Gray et al. 72-297 2,924,262 2/1960 Hufgard et al. 72296 2,442,268 5/ 1948 Fields et al 72297 RICHARD J. HERBST, Primary Examiner M. J. KEENAN, Assistant Examiner US. Cl. X.R. 72-308, 400
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722252A (en) * 1970-08-20 1973-03-27 Gen Metalcraft Inc Sheet metal forming apparatus
US3724255A (en) * 1971-04-29 1973-04-03 A Molino Duct forming apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442268A (en) * 1942-07-16 1948-05-25 Bocing Aircraft Company Apparatus for stretch bending structural elements
US2632493A (en) * 1950-09-02 1953-03-24 Richard Seifried Position-controlling means for gripping jaws
US2924262A (en) * 1958-02-12 1960-02-09 Cyril Bath Co Method and apparatus for forming sheet metal stock
US3103243A (en) * 1958-06-04 1963-09-10 British Xylonite Co Ltd Apparatus for making dished receptacles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442268A (en) * 1942-07-16 1948-05-25 Bocing Aircraft Company Apparatus for stretch bending structural elements
US2632493A (en) * 1950-09-02 1953-03-24 Richard Seifried Position-controlling means for gripping jaws
US2924262A (en) * 1958-02-12 1960-02-09 Cyril Bath Co Method and apparatus for forming sheet metal stock
US3103243A (en) * 1958-06-04 1963-09-10 British Xylonite Co Ltd Apparatus for making dished receptacles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722252A (en) * 1970-08-20 1973-03-27 Gen Metalcraft Inc Sheet metal forming apparatus
US3724255A (en) * 1971-04-29 1973-04-03 A Molino Duct forming apparatus

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