GB1603532A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1603532A – Apparatus and method for forming steps in profiled sheets of material
– Google Patents

GB1603532A – Apparatus and method for forming steps in profiled sheets of material
– Google Patents
Apparatus and method for forming steps in profiled sheets of material

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Publication number
GB1603532A

GB1603532A
GB14542/78A
GB1445278A
GB1603532A
GB 1603532 A
GB1603532 A
GB 1603532A
GB 14542/78 A
GB14542/78 A
GB 14542/78A
GB 1445278 A
GB1445278 A
GB 1445278A
GB 1603532 A
GB1603532 A
GB 1603532A
Authority
GB
United Kingdom
Prior art keywords
sheet
die
dies
profile
pair
Prior art date
1978-04-12
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB14542/78A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Individual

Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1978-04-12
Filing date
1978-04-12
Publication date
1981-11-25

1978-04-12
Application filed by Individual
filed
Critical
Individual

1978-04-12
Priority to GB14542/78A
priority
Critical
patent/GB1603532A/en

1978-05-04
Priority to US05/902,707
priority
patent/US4250728A/en

1981-11-25
Publication of GB1603532A
publication
Critical
patent/GB1603532A/en

Status
Expired
legal-status
Critical
Current

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Classifications

B—PERFORMING OPERATIONS; TRANSPORTING

B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL

B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL

B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 – B21D9/00; Twisting

B21D11/18—Joggling

B—PERFORMING OPERATIONS; TRANSPORTING

B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL

B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL

B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form

B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing

E—FIXED CONSTRUCTIONS

E04—BUILDING

E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS

E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels

E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure

E04C2/32—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material

E04C2/322—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material with parallel corrugations

E—FIXED CONSTRUCTIONS

E04—BUILDING

E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS

E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets

E04D3/24—Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like

E04D3/30—Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like of metal

Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC

Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

Y10T428/00—Stock material or miscellaneous articles

Y10T428/12—All metal or with adjacent metals

Y10T428/1241—Nonplanar uniform thickness or nonlinear uniform diameter [e.g., L-shape]

Abstract

Two pairs of dies are arranged adjacent each other so that each pair can clamp onto a metal sheet between them. One pair is situated slightly below, or stepped down from, the other pair. One pair of dies clamps onto the sheet, and then the other pair is clamped onto it to bend the sheet so that a step is formed in the sheet between the two pairs of dies, corresponding to the step down from one pair of dies to the other.

Description

(54) APPARATUS AND METHOD FOR FORMING STEPS IN
PROFILED SHEETS OF MATERIAL
(71) I, ERIC GRAEME KING, of Flat 1, 31, Carnot Street, Rotorua, New Zealand, a
New Zealand citizen, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to an apparatus and method for forming steps or bends in profiled sheets of material. The invention has been designed particularly for forming steps in sheets of metal and especially long-run roofing iron, for use in roofing applications.
The steps formed in the roofing iron give the impression of a tile-like formation in the completed roof. However, it should be realised that the invention can be adapted for use with other materials for use in this and other applications.
While there is no problem with bending or forming steps in flat sheets of metal or other materials a problem arises in bending or forming steps across a profiled sheet of material which is three dimensional rather than two dimensional and the resulting bend or bends can be distorted by deformation of the material or alternatively tearing of the material can occur. It was with these problems in mind that the present invention was devised.
In the specification and claims ‘profile’ means one or more, and in the latter case parallel, corrugations in the sheet of material, each corrugation being either of smoothly varying curvature, or a combination of straight portions joined by portions of smoothly varying curvature, in its transverse cross-section. Also, the expression ‘formed across its profile’ means being formed in a direction transverse to the longitudinal extent of the corrugation or corrugations.
Further, by ‘inverse of the profile’ it is meant a profile having a phase difference of 180 with respect to the original profile.
In one aspect the present invention consists in an apparatus for forming a step in a profiled sheet of material where the step is formed across the profile of the sheet, the apparatus comprising a first die and a second die which together provide a first pair of opposing dies, and a third die and a fourth die which together provide a second pair of opposing dies, the second pair of dies being located adjacent the first pair of dies and positioned so that a step is or can be provided between the second die and the fourth die, the first die and the third die being separately movable towards and away from the second die and the fourth die respectively, the dies of each pair having on the opposing faces a profile corresponding to the profile of the sheet of material, and those adjacent faces of the dies forming the step in use having a profile which is the inverse of the profile of the rest of the sheet of material.
In a second aspect the present invention consists in a method of forming a step in a profiled sheet of material where the step is formed across the profile of the sheet, the method comprising the steps of placing a profiled sheet between a first die and second die, which together provide a first pair of opposing dies, and between a third die and a fourth die, which together provide a second pair of opposing dies, the second pair of dies being located adjacent the first pair of dies and positioned so that there is a step between the second die and the fourth die, the opposing faces of each pair of dies having a profile corresponding to the profile of the sheet, closing the first die against the second die to clamp the sheet between their opposing faces and then closing the third die against the fourth die to clamp the sheet between their opposing faces, this latter operation forming a step in the sheet which is given a profile the inverse of the profile of the rest of the sheet by the action of the adjacent face of the third die moving over the adjacent face of the second die, both of these adjacent faces having a profile which is the inverse of the profile of the rest of the sheet of material, the dies of each pair then being separated.
In a third aspect the present invention consists in a sheet of material having a corrugated profile across the width of the sheet, the corrugations running lengthwise along the sheet, and a plurality of steps formed across the profile of the sheet, said steps being located at substantially spaced intervals from each other along the length of the sheet, the height of each step being substantially less than the length of the said intervals between the steps, each step having a corrugated profile which is in the inverse of the profile of the rest of the sheet.
In a fourth aspect the present invention consists in a profiled sheet of material having a step formed across the profile of the sheet, said step having a profile which is the inverse of the profile of the rest of the sheet.
The above gives a broad description of the invention and a preferred form of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 is a cross section on I-I of Figure
S showing the corrugated or substantially sinusoidal profile of the preferred sheet of material,
Figure 2 is a view on Il-Il of Figure 5 showing an elevation of a step formed in the sheet of material,
Figure 3 is a view on Ill-Ill of Figure 5 looking down on the step formed in the sheet of material,
Figure 4 is a diagrammatic perspective view of the dies used in forming the step of the sheet of material,
Figure 5 is a perspective view of the preferred sheet of material having a corrugated or substantially sinusoidal profile in which a plurality of steps have been formed,
Figure 6 shows in diagrammatic form an elevation of a preferred apparatus for continuously forming steps in a continuously moving sheet of material, and
Figure 7 shows in diagrammatic form the sequence of movements, I, II, III and IV, performed by the dies during the step or tile forming operation.
According to the present invention an apparatus and a method are provided for forming steps in a profiled sheet of material.
The material will usually be a metal and in particular will usually be a long run iron sheet such as used in roofing. Commonly roofing iron has a corrugated or substantially sinusoidal profile as illustrated in the drawings and by use of the invention a plurality of steps can be formed in the iron sheet at intervals along its length, these steps being formed across the profile of the sheet. As has been previously explained the profiled sheet is in fact three dimensional and because of this great care must be taken in the step forming operation and dies appropriate to the forming operation and the particular profile of the sheet of material must be used.
The basic apparatus of the invention comprises four dies, there being a first die 1 and a second die 2 which together form a first pair of opposing dies, and a third die 3 and a fourth die 4 which together form a second pair of opposing dies. As shown in Figure 4 and in Figures 910 the two pairs of dies are placed adjacent each other with the second and fourth dies being positioned relative to each other so there is a step between them.
During a step forming operation these two dies 2 and 4 are fixed relative to each other and in fact could be formed from the one die block but it is preferred that they are separate and adjustable relative to each other so that the depth of the step can be adjusted. The first die and the third die are movable towards and away from the second and fourth dies respectively as indicated by the arrows A in Fig. 4. The movement of the first and third dies will not normally coincide though the movements will usually be related.
Each die has on its face opposing the other die of the pair, a profile corresponding to the profile of the sheet of material 8. The opposing faces of the first pair of dies are indicated by the number 5 and the opposing faces of the second pair of dies are indicated by the number 6. In Figure 4 the profile shown is substantially sinusoidal for use with the usual corrugated sheets or roofing iron the cross-sectional profile of which is shown in Fig. 1. Those faces of the dies forming the step in use, that is the adjacent faces 7 between the adjacent pairs of dies, are also profiled but this profile is the inverse of the profile of the sheet of the material and of the profile on the faces S and 6 of the dies. This feature is illustrated in Figure 4 but is perhaps more clearly shown on the formed sheet of material shown in Figures 2 and 3.
From these two Figures it can be seen that a dip 9 in the profile of the sheet of material 8 corresponds to a peak 10 in the step 11 formed in the sheet of material. Only the adjacent faces of the second and third dies need be profiled as it is the movement of the adjacent face of the third die over the adjacent face of the second die which forms the profiled step but usually the adjacent faces of the four dies will be profiled.
Whilst most sheets of long-run roofing iron have a substantially sinusoidal corrugated profile the invention can be adapted for use with sheets of material having other profiles.
However, because of the deformation of the material in a step during the formation of the step it has been found that in practice the angle between a normal to the general plane of the sheet of material and a tangent td the profile be substantially equal to or greater than 15 and less than 90 , this angle being the angle ‘a’ shown in Figure 1. Obviously if the angle ‘a’ was 90 to all parts of the profile the sheet of material would be a flat sheet.
In practice, the step forming operation is performed by raising the first die and also raising the third die clear of the step to allow a suitably profiled sheet of material to be placed between the dies of each pair and the first die is lowered to clamp the sheet of material between the first and the second dies. The third die is then lowered against the fourth die to form the step in the sheet of material. To reduce undesirable deformation of the sheet of material during the forming operation it is important to fold across the profile all at the same time, the die 3 as it descends contacting the profiled sheet of material at all points across its width at the same time. It is a feature of the invention that by first closing together the first pair of dies and then the second pair of dies there is no drawing of the metal except at the bend lines.
Once the step has been formed in the sheet of material the first and third dies are then raised to allow the sheet of material to be repositioned for the stamping of a second step or to remove the sheet from between the dies.
The sequence of operations described above is illustrated in Figure 7.
The dies can be operated in a static hydraulic or pneumatic press in which case the sheet of material is held stationary while either pair of dies is clamped against the sheet. Alternatively the apparatus can be adapted for a continuous forming operation as will now be described with particular reference to Figures 6 and 7 of the accompanying drawings. For a continuous operation a sheet of roofing iron or other material will usually be provided in the form of a roll. In
Figure 6 the sheet of metal 8 supplied in roll form is fed from a de-coiler 12 through a series of roll formers 13. These roll formers are driven and impart motion to the sheet of metal and usually the roll formers will also be used to form the desired profile across the width of the sheet of metal. In this manner the sheet of metal can be corrugated, for example, as is usual. A guillotine 14 is preferably provided after the roll formers and before or after the dies to cut the sheet of metal to required lengths. The sheet of metal is then fed between the upper and lower dies of die block assembly 15 which perform the tile forming operation, after which the sheet of metal is fed to a run off table 16 or the like.
The die block assembly 15 has a base 19 which is mounted on and is movable along a track 17 so that the die block assembly can be reciprocated back and forth. The preferred die block assembly as shown in Figure 7 comprises the base 19 which carries two lower dies 2 and 4. Die 4 is stepped down with respect to die 2, it being this step which is to be stamped into the sheet of metal to give the stepped tile pattern. Positioned above the lower dies are the two upper dies 1 and 2 respectively.
In sequence I of Figure 7 the long-run sheet of metal 8 is moving to the right as shown by arrow B. when this contacts a limit switch 20 a ram (not shown) which may be hydraulic or pneumatic or a combination of both is activated to close die 1 against die 2, thus clamping the sheet of metal between these two dies, as is shown in sequence II. At this stage the die block assembly is itself moving to the right (arrow.C) on track 7 at the same rate at which the sheet of metal is moving. Die 3 is moved by a second ram (not shown) against die 4 which is fixed to give the depth of step required in relation to die 2.
This is shown in sequence III. Once the step 11 has been formed die 3 is raised followed by die 1 whereupon die block assembly 15 is moved in direction of arrow D back to its original position, as shown in sequence IV, the sheet of metal passing through the gap between the upper and lower dies, ready for the next stamping operation.
Any known and suitable arrangement can be used to cause reciprocation of the die block assembly. One simple arrangement is to have a spring return arrangement so that when die 1 is clamped against die 2 with the sheet of metal between, the movement of the sheet of metal causes the die block assembly to be moved along its sliding track. After the forming operation and on separation of the upper and lower dies, the spring arrangement then causes the die block to slide back to its original position.
Suitable de-coiling and roll forming apparatus is already known and it is preferred that the die block assembly be adapted for use with existing machines producing long-run iron roofing in various profiles. A common production rate is about 15 m per minute and if the length of tile (that is the distance between each step 11) is 30 cm, the die block assembly must undergo 50 cycles per minute.
It will be apparent from the drawings that the length of the tile is governed by the position of the limit switch 20 which is preferably adjustable in position and that when the die block 3 is raised, the limit switch is clear of the metal sheet and is positioned ready to be contacted by that step last formed, as it moves out from between the dies, the steps being formed at equal intervals.
An advantage of the apparatus shown in
Fig. 6 is that there are no limitations on the length of run apart from the total length of the sheet of material in the coil. The roll formers 13 can be run by themselves to form standard long-run roofing or the roll former can be used in conjunction with the apparatus of this invention to produce long-run stepped and profiled sheets. The effect of putting the step into the profile sheet of metal provides a three dimensional fold which has very strong resistance to bending. The profiled sheets with the profiled steps allow overlapping at the edges of two or more sheets where weatherproof joints are required.
The invention that has been described has covered the particular case of the formation of a step in a profiled sheet of material.
However, in another aspect of the invention the apparatus could be adapted to form a single bend in a profiled sheet of material at an edge of the sheet, the die 4 being lowered sufficiently with respect to die 2 or removed altogether. Furthermore, the bend or step formed in the sheet of material need not be at right angles to the plane of the sheet of material but could be at some other angle, though obviously greater complications occur with bend angles of greater than 90 because of the greater deformation of the material that is involved.
While the usual material that would be used would be a metal sheet other materials such as plastics materials could also be used; the sheet perhaps being suitably heated before the forming operation to allow the bending and deformation of the material to occur.
A feature of the invention is that because drawing of the sheet material is not marked and occurs virtually only at the bend lines the sheet may be pre-painted, and then formed without cracking the coat of paint.
Similarly the galvanised layer on sheets of steel is not damaged to any great extent during the step forming operation.
WHAT WE CLAIM IS:
1. An apparatus for forming a step in a profiled sheet of material where the step is formed across the profile of the sheet, the apparatus comprising a first die and a second die which together provide a first pair of opposing dies, and a third die and a fourth die which together provide a second pair of opposing dies, the second pair of dies being located adjacent the first pair of dies and positioned so that a step is or can be provided between the second die and the fourth die, the first die and the third die being separately movable towards and away from the second die and the fourth die respectively, the dies of each pair having on the opposing faces a profile corresponding to the profile of the sheet of material, and those adjacent faces of the dies forming the step in use having a profile which is the inverse of the profile of the rest of the sheet of material.
2. An apparatus as claimed in Claim 1, wherein the sheet of material is long-run roofing iron.
3. An apparatus as claimed in Claim I or 2, wherein the sheet of material is corrugated and the profile of the sheet of material and hence the profiles of the dies are substantially sinusoidal.
4. An apparatus as claimed in any one of the preceding Claims, wherein the profiles are such that the angle between a line normal to the general plane of the sheet of material and the tangent to the profile, and hence the angle between a line normal to the general plane of a profiled.face of a die and the tangent to the profile of the face, is at least 15 .
5. An apparatus as claimed in any one of the preceding Claims, wherein the second and fourth dies are adjustable relative to each other to allow adjustment of the height of the step to be formed in the sheet of material.
6. An apparatus as claimed in any one of the preceding Claims, wherein the four dies are mounted as a unit on a track and said unit is reciprocable on said track.
7. An apparatus as claimed in Claim 6, wherein the apparatus includes de-coiling means before the dies for de-coiling the sheet of material if supplied in roll form, and cutting means for cutting the sheet of material to length, the cutting means being located after the decoiling means and either before or after the dies.
8. An apparatus as claimed in Claim 6 or
Claim 7, wherein the apparatus includes a control means to automatically control the spacing between the steps formed in a sheet of material.
9. An apparatus substantially as herein described with reference to the accompanying drawings.
10. A method of forming a step in a profiled sheet of material where the step is formed across the profile of the sheet, the method comprising the steps of placing a profiled sheet between a first die and second die, which together provide a first pair of opposing dies, and between a third die and a fourth die, which together provide a second pair of opposing dies, the second pair of dies being located adjacent the first pair of dies and positioned so that there is a step between the second die and the fourth die, the opposing faces of each pair of dies having a profile corresponding to the profile of the sheet, closing the first die against the second die to clamp the sheet between their opposing faces and then closing the third die against the fourth die to clamp the sheet between their opposing faces, this latter operation forming a step in the sheet which is given a profile the inverse of the profile of the rest of the sheet by the action of the adjacent face of the third die moving over the adjacent face of the second die, both of those adjacent faces having a profile which is the inverse of the profile of the sheet of material, the dies of each pair then being separated.
11. A method as claimed in Claim 10, wherein the sheet of material is continuously moving and the dies are reciprocated back and forth along a track, the dies moving with the sheet while the one or both pairs of dies are clamped against the sheet and returning when the sheet is released.
12. A method as claimed in Claim 11, wherein the sheet of material is provided in
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (23)

**WARNING** start of CLMS field may overlap end of DESC **. of a step in a profiled sheet of material. However, in another aspect of the invention the apparatus could be adapted to form a single bend in a profiled sheet of material at an edge of the sheet, the die 4 being lowered sufficiently with respect to die 2 or removed altogether. Furthermore, the bend or step formed in the sheet of material need not be at right angles to the plane of the sheet of material but could be at some other angle, though obviously greater complications occur with bend angles of greater than 90 because of the greater deformation of the material that is involved. While the usual material that would be used would be a metal sheet other materials such as plastics materials could also be used; the sheet perhaps being suitably heated before the forming operation to allow the bending and deformation of the material to occur. A feature of the invention is that because drawing of the sheet material is not marked and occurs virtually only at the bend lines the sheet may be pre-painted, and then formed without cracking the coat of paint. Similarly the galvanised layer on sheets of steel is not damaged to any great extent during the step forming operation. WHAT WE CLAIM IS:

1. An apparatus for forming a step in a profiled sheet of material where the step is formed across the profile of the sheet, the apparatus comprising a first die and a second die which together provide a first pair of opposing dies, and a third die and a fourth die which together provide a second pair of opposing dies, the second pair of dies being located adjacent the first pair of dies and positioned so that a step is or can be provided between the second die and the fourth die, the first die and the third die being separately movable towards and away from the second die and the fourth die respectively, the dies of each pair having on the opposing faces a profile corresponding to the profile of the sheet of material, and those adjacent faces of the dies forming the step in use having a profile which is the inverse of the profile of the rest of the sheet of material.

2. An apparatus as claimed in Claim 1, wherein the sheet of material is long-run roofing iron.

3. An apparatus as claimed in Claim I or 2, wherein the sheet of material is corrugated and the profile of the sheet of material and hence the profiles of the dies are substantially sinusoidal.

4. An apparatus as claimed in any one of the preceding Claims, wherein the profiles are such that the angle between a line normal to the general plane of the sheet of material and the tangent to the profile, and hence the angle between a line normal to the general plane of a profiled.face of a die and the tangent to the profile of the face, is at least 15 .

5. An apparatus as claimed in any one of the preceding Claims, wherein the second and fourth dies are adjustable relative to each other to allow adjustment of the height of the step to be formed in the sheet of material.

6. An apparatus as claimed in any one of the preceding Claims, wherein the four dies are mounted as a unit on a track and said unit is reciprocable on said track.

7. An apparatus as claimed in Claim 6, wherein the apparatus includes de-coiling means before the dies for de-coiling the sheet of material if supplied in roll form, and cutting means for cutting the sheet of material to length, the cutting means being located after the decoiling means and either before or after the dies.

8. An apparatus as claimed in Claim 6 or
Claim 7, wherein the apparatus includes a control means to automatically control the spacing between the steps formed in a sheet of material.

9. An apparatus substantially as herein described with reference to the accompanying drawings.

10. A method of forming a step in a profiled sheet of material where the step is formed across the profile of the sheet, the method comprising the steps of placing a profiled sheet between a first die and second die, which together provide a first pair of opposing dies, and between a third die and a fourth die, which together provide a second pair of opposing dies, the second pair of dies being located adjacent the first pair of dies and positioned so that there is a step between the second die and the fourth die, the opposing faces of each pair of dies having a profile corresponding to the profile of the sheet, closing the first die against the second die to clamp the sheet between their opposing faces and then closing the third die against the fourth die to clamp the sheet between their opposing faces, this latter operation forming a step in the sheet which is given a profile the inverse of the profile of the rest of the sheet by the action of the adjacent face of the third die moving over the adjacent face of the second die, both of those adjacent faces having a profile which is the inverse of the profile of the sheet of material, the dies of each pair then being separated.

11. A method as claimed in Claim 10, wherein the sheet of material is continuously moving and the dies are reciprocated back and forth along a track, the dies moving with the sheet while the one or both pairs of dies are clamped against the sheet and returning when the sheet is released.

12. A method as claimed in Claim 11, wherein the sheet of material is provided in
roll form and is de-coiled and profiled prior to passing through the dies, the sheet also being cut to length after de-coiling and profiling and either before or after passing through the dies.

13. A method substantially as herein described with reference to the accompanying drawings.

14. A profiled sheet of material having a step formed across the profile of the sheet said step having a profile which is the inverse of the profile of the rest of the sheet.

15. A profiled sheet of material as claimed in claim 14, wherein there are a plurality of steps at intervals along the length of the sheet.

16. A profiled sheet of material as claimed in claim 15, wherein the intervals are equal.

17. A sheet of material having a corrugated profile across the width of the sheet, the corrugations running lengthwise along the sheet, and a plurality of steps formed across the profile of the sheet, said steps being located at substantially equally spaced intervals from each other along the length of the sheet, the height of each step being substantially less than the length of the said intervals between the steps, each step having a corrugated profile which is the inverse of the profile of the rest of the sheet.

18. A profiled sheet of material as claimed in Claim 17, wherein each step is substantially at right angles with respect to the sheet either side of the step.

19. A profiled sheet of material as claimed in Claim 17 or 18, wherein said intervals between the steps are substantially parallel to each other.

20. A profiled sheet of material as claimed in any one of Claims 14 to 19, wherein the sheet is a length of roofing iron.

21. A profiled sheet of material as claimed in any one of Claims 14 to 20, wherein the profile is substantially sinusoidal.

22. A profiled sheet of material as claimed in any one of Claims 14 to 21, wherein the angle between a line normal to the general plane of the sheet and the tangent to the profile is at least 15 .

23. A profiled sheet of material substantially as herein described with reference to
Figures 1, 2, 3 and 5 of the accompanying drawings.

GB14542/78A
1978-04-12
1978-04-12
Apparatus and method for forming steps in profiled sheets of material

Expired

GB1603532A
(en)

Priority Applications (2)

Application Number
Priority Date
Filing Date
Title

GB14542/78A

GB1603532A
(en)

1978-04-12
1978-04-12
Apparatus and method for forming steps in profiled sheets of material

US05/902,707

US4250728A
(en)

1978-04-12
1978-05-04
Apparatus and method for forming steps in profiled sheets of material

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

GB14542/78A

GB1603532A
(en)

1978-04-12
1978-04-12
Apparatus and method for forming steps in profiled sheets of material

US05/902,707

US4250728A
(en)

1978-04-12
1978-05-04
Apparatus and method for forming steps in profiled sheets of material

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GB1603532A
(en)

1981-11-25

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GB14542/78A
Expired

GB1603532A
(en)

1978-04-12
1978-04-12
Apparatus and method for forming steps in profiled sheets of material

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(1)

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Cited By (5)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

EP0133424A2
(en)

1983-08-05
1985-02-20
Ab Volvo
A tool for producing bends in curved surfaces

GB2222839A
(en)

1988-09-14
1990-03-21
Terence Harold Davies
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1980-11-24
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PROCEDURE AND DEVICE FOR MANUFACTURING A ROOF COATING

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PROCEDURE FOR THE PREPARATION OF A ROOF COVER

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1958-04-15
1959-09-01
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Process and machine for pleating pliable materials

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1958-10-02
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Summers & Sons Ltd John
Improvements in corrugated metal sheets

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1972-12-14
1976-02-17
Andrew Corporation
Continuous corrugated waveguide and method of producing the same

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1976-02-09
1977-10-11
Straza Enterprises, Ltd.
Method and apparatus for making rectangular corrugated expansion joints

1978

1978-04-12
GB
GB14542/78A
patent/GB1603532A/en
not_active
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1978-05-04
US
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patent/US4250728A/en
not_active
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1985-02-20
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A tool for producing bends in curved surfaces

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A tool for producing bends in curved surfaces

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1988-09-14
1990-03-21
Terence Harold Davies
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1988-09-14
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1992-01-08
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1990-07-05
1994-06-01
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1996-12-13
Lahera Productions Sarl
Regular corrugation method of portion of lead sheet for roof aperture flashing

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(en)

2017-09-25
2018-02-23
燕山大学
A kind of sheet material ring ripple drawing severe deformation mould and processing method repeatedly

Also Published As

Publication number
Publication date

US4250728A
(en)

1981-02-17

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