GB2238268A

GB2238268A - Punching roofing and cladding sheets

Info

Publication number: GB2238268A
Application number: GB9016200A
Authority: GB
Inventors: Josef Schenach
Original assignee: GARIN Ltd
Current assignee: GARIN Ltd
Priority date: 1989-08-01
Filing date: 1990-07-24
Publication date: 1991-05-29
Anticipated expiration: 2010-07-24
Also published as: GB9016200D0; GB2238268B

Abstract

A machine, for punching transversely extending holes in a longitudinally extending transversely profiled e.g. corrugated, roofing or surface cladding sheet to allow transverse bending of the sheet, punches the holes in the longitudinally extending valleys of the profile and their sloping side walls with the sheet supported in inverted state. Die holes are formed in the crests 23 and slopes 55 of a support of complementary shape to the corrugated sheet and punches 26-29 cooperate with the die holes to form tapered slots (53) in the valleys (45, Fig 3) and their side walls of the inverted sheet. The punch platen is driven by a lever arrangement 9-15 or hydraulic ram(s). <IMAGE>

Description

This invention resides in the field of roofing and cladding, in particular the use of corrugated or undulated sheet material for roofing and for cladding of surfaces. The terms corrugated and undulated are intended to be understood in the general sense of not only the classical sinuous corrugated sheet metal roofing sheet but also so called "IBR" (Inverted Box Rib Systems) type profiles for roofing sheets, comparable and analogous profiled sheeting for cladding wall, ceiling, fascia and many other surfaces in buildings and in other applications and such roofings and claddings in materials other than metals thus, for example, also glass fibre re-inforced plastics material, polymeric materials and others.

In order to fashion such sheet materials in a multiplicity of requirements where roofing and cladding is applied to structures and to other applications it is necessary to be able to bend them, crank them or in general terms change the direction of the sheeting moving in a direction parallel to the corrugations, undulations or the like. The very nature of these corrugations and undulations is to make the sheet stiff and it can in fact not be bent, cranked or turned in this direction without damaging the sheet. An object of this invention is to overcome this problem and in particular included in the invention is a machine for processing such sheets to prepare them for bending, such sheets having been duly processed for bending and then also after they have been bent.

A machine in accordance with this invention is adapted to punch holes on the valleys and sloping sides of a corrugated or undulated sheet and comprises a base presenting ~a supporting profile corresponding substantially to the upside down profile of the sheet and having die holes on the crests and sloping sides of that profile together with a stock above the base carrying die punches which co-operate with the die holes and can be moved downwards to punch such holes in the sheet.

The invention will be more fully described by way of an example with reference to the accoppanying drawings, in which Figure 1 is an elevation of a machine in accordance with a preferred embodiment of this invention, Figure 2 is a plan view of the machine, Figure 3 is an end oblique elevation of the sheet profile to be worked in the machine shown in figures 1 and 2, and Figure 4 is a plan view of the sheet metal after having been punched out by the machine.

As shown in the drawings the machine comprises a base 1 which has two upright pillars 2 and 3 on which collars 4 and 5 respectively are slideable, the collars being mounted in a stock 6 which thus can be moved upwards and downwards above the base. The stock 6 has brackets 7 and 8 to which are hingedly connected links 9 and 10 joined to a yoke 11 which extends upwardly to a clevis 12 to which a lever 13 is hingedly connected. The fulcrum 14 of the lever 13 is hinged to a bracket 15 which is attached to a frame 16 in turn by legs 17 and 18 to the base 1. Actuation of the lever 13 can therefore move the stock up and down guided by the bushes 4 and 5 running on the posts 2 and 3. An alternative actuation mechanism would be a set of hydraulic rams or a single central ram, adapted to move the stock upwards and downwards with respect to the base.

The base carries a pad 19 in which profiled formations 20 to 25 are mounted corresponding to the profile of a sheet metal roofing sheet upside down, which is to be punched and is shown in figure 3. These support formations consist of a series of crest formations 21, 22, 23, 24 and 25, mounted on pad 19 in a transversely adjustable manner, bounding each of these crests are sloping portions 55, which lead to grooves corresponding to what are the ridges in the sheet profile. These crest areas and the sloping areas are perforated by die holes and the die punches consist of the portions 26, 27, 28 and 29 which are mounted in 20 the stock 6. These of course are close fitting in the die holes so as to be able to die punch sheet metal.Each of these is terminated in positions corresponding with the downwardly sloping sides of the profile being the portions 30, 31, 32, 33, 34 and 35, tapering to a point or vertex. A guide angle iron 36 is 25 provided for feeding of the sheet metal into the machine.

The metal roofing (or surface cladding) sheet is shown in figure 3 upside down as it is fed in the punching machine of figures 1 and 2 in this orientation. Thus what are valleys in the orientation of use show as crests# 45 and 46 and ridges in the orientation of use show as grooves 47 and 48. Edge profiles on either longitudinal edge include along one edge a catch flange 49 which is bent around and extends inwardly from the edge and on the opposite edge an inwardly directed catch groove 50 formed by the sheet from the ridge groove 48 bent downwardly and inwardly mt 52 These profiles are accommodated by the profiles of the support formations in which the die holes are provided.Thus the peak 22 (referring to figure 1) of the machine provided in the profiled crest support formation 21 accommodates the channel formation 51 (figure 3) of the sheet; the profiled crest support formation 23 is undercut at 51 to accept the catch flange 49, formation 25 supports the bent part 52 of the sheet metal, which part must be distorted somewhat for the punching operation. In the view of figure 3 broken lines 53 show the holes cut out by one punching stroke. The sheet forms a panel which extends longitudinally in the direction of arrow 54, being profiled transversely.

As shown in figure 4, the metal roofing sheet of interlocking profile 40 has holes cut out of it 41, 42, 43 and 44 along the valleys and sloping sides of the profile and these holes are repeated as shown to enable the bending of the sheet in a desired way.

The holes are repeated by alternately feeding the sheet through the machine and repeating the punching strokes. With the holes in the valleys of the profile and the ridges intact the sheet can be bent to form a ridge of a ridged roof to be covered by a capping.

Claims

CLAM;

1. A machine adapted to punch holes on the valleys and sloping sides of a corrugated or undulated sheet which comprises a base presenting a supporting profile corresponding substantially to the upside down profile of the sheet and having die holes on the crests and sloping sides of that profile together with a stock above the base carrying die punches which ccroperate with the die holes and can be moved downwards to punch such holes in the sheet.

2. A machine as claimed in claim 1, in which the supporting profile is provided by a pad on which profiled support formations are mounted, one distinct formation for each crest area of the profile, fixed on the pad in transversely adjustable manner.

3. A machine as claimed in claim 2, which includes at least one formation which is undercut to accept a catch flange at an edge of the sheet.

4. A machine as claimed in either one of claims 1 or 2, which includes at least one formation adapted to accept a catch groove in the sheet at one edge after distorting this groove for the punching operation.

5. A machine for punching holes in corrugated or undulated sheet substantially as herein described and as illustrated in figures 1 and 2 of the accompanying drawings.

6. A roofing or surface cladding sheet comprising a longitudinally extending transversely profiled panel having at least one ridge and valley and edge profiles for interlocking with adjacent sheets, the sheet having holes punched out of its valley(s) and adjacent sloping sides of the valleys.

7. A roofing or surface cladding sheet as claimed in claim 6, in which the holes taper in the valley sides towards a point.

8. A roofing or surface cladding sheet substantially as herein described and as illustrated in figures 3 and 4 of the accompanying drawings.