WO1997032380A1 - Boitier metallique pour le montage d'accessoires electriques - Google Patents
Boitier metallique pour le montage d'accessoires electriques Download PDFInfo
- Publication number
- WO1997032380A1 WO1997032380A1 PCT/GB1997/000580 GB9700580W WO9732380A1 WO 1997032380 A1 WO1997032380 A1 WO 1997032380A1 GB 9700580 W GB9700580 W GB 9700580W WO 9732380 A1 WO9732380 A1 WO 9732380A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- box
- wall
- electrical accessory
- plate
- outer edge
- Prior art date
Links
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
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/52—Making hollow objects characterised by the use of the objects boxes, cigarette cases, or the like
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/46—Boxes; Parts thereof or accessories therefor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/08—Distribution boxes; Connection or junction boxes
- H02G3/081—Bases, casings or covers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/08—Distribution boxes; Connection or junction boxes
- H02G3/18—Distribution boxes; Connection or junction boxes providing line outlets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/08—Distribution boxes; Connection or junction boxes
- H02G3/12—Distribution boxes; Connection or junction boxes for flush mounting
- H02G3/121—Distribution boxes; Connection or junction boxes for flush mounting in plain walls
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/08—Distribution boxes; Connection or junction boxes
- H02G3/14—Fastening of cover or lid to box
Definitions
- This invention concerns metal boxes for mounting electrical accessories.
- Such mounting boxes are formed with a base and upstanding sides, with the box open to receive an electrical accessory, which when fitted forms an effective lid closing the box.
- the mounting box is normally finished to match the electrical accessory that will be mounted to it.
- electrical accessories may include switches, sockets, circuit breakers, plain covers for terminal boxes and similar devices.
- known combinations of electrical accessories and metal boxes are made such that the front plate is provided with sides depending from the front surface, where the inside dimensions of the sides is such that they may fit over the outside of the upstanding box sides.
- the disadvantage of this is that such assemblies require the box dimensions to be smaller than the frontplate of the accessory limits the wiring space available in the box.
- a metal electrical accessory mounting box comprising an open box part and a front plate, the open box part having a base and at least one upstanding wall, the wall having an outer edge and a ledge adjacent the outer edge to receive closely and abuttingly locate the front plate on the open box part, the ledge being formed so that a surface of the front plate at an angle to the base is flush with the corresponding external surface of the wall at the abutment of the front plate and wall.
- the outer edge of the wall is displaced towards the inside of the box forming the ledge having a top facing surface and a lateral facing surface, the top facing surface providing an axial location for a lid in a direction substantially at right angles to the plane of the base, and preferably the lateral facing surface providing a lateral location for the lid in a direction substantially parallel to the plane of the base.
- a process of making an electrical accessory mounting box comprises the steps of:-
- the blank is formed into the box by a deep drawing press operation, and the outer edge is formed by a method such as a pinch trim press operation so that the outer edge is at substantially a constant height above the base.
- the mandrel is constructed with a first edge, and the force is applied by a punch with a second edge, and a closest distance between the first edge and the second edge at their closest position is less than a thickness of the sheet of metal.
- the closest distance is less than two thirds of the thickness of the metal.
- flush mounting boxes Both these boxes have a base and an open front. Normally in Great Britain the boxes are rectilinear and have four walls, but they can be cylindrical so that they only have a base and a single wall. Mounted to these boxes is usually a fitting such as a front plate on which is mounted an electrical device, the front plate acting as a closure to the box.
- the comp_ete assembly that is device, box and any intermediate components such as a front plate will be referred to hereafter as an electrical accessory.
- a plate known as a "grid” or “grid plate” is provided to which a device and front plate is mounted.
- the grid plate is adjusted relative to the box by means of screws through the grid plate into the box. Because of the requirement to adjust the grid plate relative to the box the grid plate is smaller in lateral extent than the extent of the inner surface of the side walls of the box.
- a primitive grid plate is provided which is larger in extent than the extent of the inner surface of the box. In this case adjustment is obtained by providing an adjustable bracket either side of the box which can be adjusted relative to the mounting surface so that the front plate abuts the mounting surface. In both cases adjustment is tedious particularly in the latter case because there is no easy way of judging whether or not the front plate is going to be at the correct level after adjusting the grid plate until after the front plate is fitted.
- an electrical accessory comprises an electrical device and a mounting grid plate to which the device is mounted, the plate having opposed lateral tongues extending outwardly away from the device so dimensioned and arranged so as to locate the plate on a surface surrounding a standard flush mounting box the tongues being also so dimensioned and arranged so as to locate the plate on a surface if a surface mounted mounting box, the plate having means for securing it to each mounting surface.
- the invention further comprises a grid plate for use in the electrical accessory of the invention.
- the lateral tongues of the grid By extending the lateral tongues of the grid place well beyond the outer lateral extremity of the standard flush box that is in Great Britain more than 55mm across the extremities of the plate the lateral tongues are easily adjusted to seat on the surrounding surface so that the grid plate, and hence electrical device, are at the correct level relative to the surrounding surface so that it merely remains to screw the front plate directly onto the grid plate where it should automatically abut correctly.
- the lateral extent of the grid plate should not be too great. A maximum of 86 mm overall is deemed sufficient.
- the front plate is sufficiently large in the lateral extent to extend over the tongues and can be of processed or moulded metal or plastics.
- the arrangement of a preferred embodiment of the invention is such that when decorating it is easy to remove the front plate without baring any live components of the device which can remain operative. Also front plates can be easily exchanged if a different decorative effect is preferred.
- Figure 1 shows a perspective view of a surface mounting box for an electrical accessory according to the invention, and a perspective view of a corresponding grid and front plate;
- Figure 2 shows a cross section through the box and plates shown in Fig. 1 on line AA, with the front plate shown in Fig. 1 positioned ready to be fitted to the box;
- Figure 3 shows an enlarged cross sectioned view of an edge of the box shown in Fig. 2;
- Figure 4 shows a perspective view of the grid plate shown in Fig. 1 mounted to a folded metal flush box together with a modular switch connected to wiring and ready for insertion into the grid plate.
- Figure 5 shows a partly sectioned view of a press tool for deforming the wall of the box of Figs. 1 to 3 to produce the ledge shown in Fig. 3;
- Figure 6 shows a perspective view of the tool (shown in section in Fig. 5) for deforming the wall of the box to produce a ledge.
- a metal surface mounting box at 1 and a grid plate 310 (hereafter referred to as a "grid") and a front plate or cover 2.
- the box 1 comprises a base 10 with four upstanding side walls 11, 12, 13, 14. Each side wall is provided with a knockout 15, 16, 17, 18 one or more of which the installer may remove to provide an entry hole for electrical cable or an electrical conduit. Two of the side walls are fitted with fixing lugs 20, 22 which protrude into the interior of the box.
- Each fixing lug has a threaded hole 24, 26 to receive a pan head fixing screw 312 and 313 to retain the grid 310 onto the box.
- a continuous ledge 100 is formed around the perimeter of the upstanding side walls 11, 12, 13, and 14.
- a fillet radius 30, 31, 32, 33 (see Fig. 2) is provided between the upstanding sidewalls 11 and 13 and the base 10.
- the fillet radius 30, 31, 32, 33 is continuous around the box base 10, and is provided to facilitate the manufacture of the box by deep drawing on a press tool without significant thinning or creasing of the material. For the same reason a similar radius is provided at each box corner 34, 35, 36, 37.
- the box is rectangular with box side first dimension 40 and second dimension 42. For a one gang (or substantially square) box these dimensions will normally be the same, but for a two gang (or rectangular) box the second dimension will be longer than the first dimension.
- the enlarged scrap view in Fig. 3 of the ledge 100 clearly shows a flat step 102 formed by a displacement 106 of a periphery 104 of the side wall 13.
- Displacement 106 is slightly greater than the material thickness 108 of the side wall 13.
- the partially sheared step thickness 112 is significantly less than the material thickness 108.
- Internal corners 114 and 116 have small radii while the externally visible corner 118 has a larger radius.
- the interior corner 120 also has a larger radius with a dimension approximately half or one times the material thickness 108.
- the ledge 100 has a minimum substantially flat width 122 which is greater than half the material thickness 108.
- a top edge 110 of the periphery 104 is illustrated as having a smoothly curved surface, however since this edge is formed by a pinch-trim operation on a press tool and is not subsequently finished its shape after the creation of the displacement of the periphery 104 may be different from that shown.
- the precise shape obtained depends on the degree of planishing done during the creation of the displacement 106.
- the cover 2 comprises a top 200 and depending sides 201, 202, 203, 204.
- a bottom edge 214 extends around the depending sides.
- a chamfer 206 is provided on the cover to give a distinctive styling feature.
- the top 200 has two countersunk holes 210, 212 to receive countersunk fixing screws 208 (only one shown) and an aperture 232 to receive an electrical accessory such as a modular switch 334 shown in Fig. 4.
- the switch module is arranged so that a protruding shroud part 333 is shaped to fit closely to an aperture wall 234 of aperture 232. It is intended that a shroud face 335 will be flush with the top 200 of the cover 2 when it is correctly positioned.
- Mounting grid 310 also has threaded holes 318 and 320 for accepting the countersunk fixing screws 208 to retain the cover 2.
- Electrical devices such as the switch 334 may be fitted to the grid 310 in the aperture 340 and may be retained by resilient snap fits 380, 382 (shown in Fig. 4) which co-operate with the features 342, 344 of the aperture 340.
- An earth terminal 346 is permanently attached to the grid. On two opposing sides the grid has low walls 348, 350.
- the grid also has four tongues 352, 354, 356, 358 which extend on the two opposing sides that do not have the low walls 348, 350. Tongue 352 is narrower that the other three tongues to provide sufficient space to mount the earth terminal 346. Likewise low wall 348 does not extend around the corner adjacent to the earth terminal, so that access to the earth terminal is not restricted.
- the three wider tongues 354, 356, 358 are provided with square holes 360, 362, 364 which facilitate the accurate forming of the tongues.
- the grid 310 is arranged to be suitable for mounting to either one of surface mounting box 1 or a flush box such as folded metal flush mounting box 370 or a plastic flush mounting box (not shown) .
- the flush mounting box 370 is arranged for mounting in a wall so that when the box is mounted a top edge 372 will be substantially flush with an external facing wall surface.
- the tongues 352, 354, 356, and 358 are cranked adjacent to the square holes to ensure that their rear faces 353, 355, 357, 359 respectively are at a suitable height so that when the grid is mounted directly to an external facing wall surface in the flush mounting box 370 and the cover 2 is fitted to the grid 310 and screwed back so that the bottom edge 214 is touching the external facing wall surface, the top 200 of the cover 2 is correctly positioned flush relative to shroud face 335 of switch 334.
- the arrangement of the tongues 352, 354, 356, and 358 is necessary as in use the grid is mounted to the flush mounting box 370 with pan head screws 312, 313 before the switch 334 is connected to wiring 377, 378.
- the switch is inserted into the grid aperture 340 and then the cover 2 is mounted to the grid using countersunk fixing screws 208.
- the benefit of connecting the wiring to the switch module after the grid is mounted is that maintenance and alterations to an installation is easier, particularly for larger grids where there are a number of switch modules are mounted to the one grid.
- the installer does not use a mounting box, and the tongues rest only on the externally facing wall surface.
- the benefit of the arrangement of this embodiment is that the bottom edge 214 of the frontplate or cover when mounted will always be touching the externally facing wall surface.
- the distance between lateral extremities of the tongues is 78 mm which adequately overlaps sides of flush box 370 yet is within the 80 mm interior width of a plastic surface mounting box.
- the distance apart of screws 313 is
- each tongue extends about 9 mm beyond each adjacent screw.
- the rear faces 353, 355, 357, 359 of the lugs 352, 354, 356, and 358 will rest on the grid locations 300, 302, 304, and 306.
- the bottom edge will rest against the flat step 102 of the ledge 100 ensuring a minimum gap and the top 200 of the cover 2 is correctly positioned flush relative to the shroud face 335.
- the installer does not have to make any adjustment or alteration to the cover or the grid to use then with either a flush box or a surface box. Neither is the installer required to adjust the relative heights of the grid, the module or the cover to achieve a satisfactory installation.
- a press tool 400 for forming the ledge on a deep drawn box 3 is shown in Figure 5.
- the press tool 400 comprises a massive anvil 402 that is rigidly clamped to a bed of a suitable press (not shown) , and a moving carrier 404 that is held in a punch or tool holder of the press.
- the massive anvil 402 has an adjustable height stop 406 against which the deep drawn box 3 may be rested, a clamping anvil 408 which has had the sharp edge 410 "killed" to produce a small radius, and a planishing insert 412.
- the moving carrier 404 has slidably mounted a clamping jaw 414 and a shear punch 418, both being retained by retaining pin 422, which passes through slot 424 in the shear punch and slot 423 in the carrier.
- the clamping jaw 414 is urged in the direction of arrow M by a urethane spring 416 that is mounted to a pocket 432 reces' ad in rear face 426 and acts against a pressure face 428 o the carrier 404.
- the shear punch 418 has a rear face 430 and a forming profile 432, which has a shearing edge 434 and end ramps 436, 438 leading to set back face 444 and 446 respectively.
- the forming profile has working lengths 440 and 442 that are at least slightly longer than half and preferably less than three quarters of the box dimensions 40 and 42.
- Set back faces 444, 446 are parallel to the forming faces 448 and 450, but set back behind them by set back dimension 452.
- the press tool is preferably mounted horizontally as shown, and a deep drawn box is inserted into the tool as shown, so that a base 10' rests against the adjustable stop 406, and a first radiused box corner 34' is positioned as shown.
- the adjustable stop 406 has previously been adjusted to suit the depth of the box to be formed so that the desired height 105 of the periphery 104 (see Fig. 3) will be obtained.
- the moving carrier 404 is moved in the direction of arrow M so that clamping jaw 414 clamps the first radiused box corner 34' against the clamping anvil 408. As the moving carrier continues to move the urethane spring 416 is compressed until eventually the rear face 426 contacts the carrier face 428.
- the suitable press is capable of resisting any forces perpendicular to the direction of arrow M without a significant deflection in the perpendicular direction.
- the shear punch deforms the box side, due to the closeness of the killed sharp edge 410 and the punch corner 420, the deformation is a combination of shear and bending.
- the metal of the box is squeezed solidly between the shear punch 418 and the planishing insert 412, and also between the clamping jaw 414 and the clamping anvil 408 to perform a planishing operation.
- the periphery of the box is produced with a well defined flat step 102, and the size of the corners 114 and 116, and 118 and 120 are controlled within acceptable limits.
- the carrier then reverses its movement and moves in a direction opposite to that of arrow M.
- the box When the box is free it may be removed and rotated through 90 degrees, and re-inserted into the tool.
- the press operation is then repeated to form a ledge on the second corner, and likewise for the subsequent corners.
- the box is then inserted into another press tool which operates in a similar manner to that shown and described in Fig. 5, except that the box is mounted with side wall 12 or 14 perpendicular to the direction of arrow M, and the planishing anvil 412 is replaced by a shaped anvil which has radiused corners corresponding to radiused corners
- the box 1 is finished with paint, preferably of a hard durable material, with a significant thickness.
- This paint film is advantageously applied by a method such as electrostatic application where good coverage is provided on edges. Such a film ensures that any hazardous sharpness of the top edge is covered by the paint film and the hazard is removed.
- the paint thickness has to be allowed for in deciding on an appropriate dimension for the displacement 106 of the periphery 104, since when fitted to the box the sides 201, 202, 203, 204 of the cover must be flush with the box sides.
- the cover must be a clearance fit over the periphery to ensure easy mounting, but if the clearance is too great the benefit of the location provided by the periphery will be lost.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU22244/97A AU2224497A (en) | 1996-02-29 | 1997-02-28 | A metal electrical accessory mounting box |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9604324A GB2310762B (en) | 1996-02-29 | 1996-02-29 | An electrical accessory mounting |
GB9604323.7 | 1996-02-29 | ||
GB9604325A GB2310621B (en) | 1996-02-29 | 1996-02-29 | A process of making a metal electrical accessory mounting box |
GB9604324.5 | 1996-02-29 | ||
GB9604325.2 | 1996-02-29 | ||
GB9604323A GB2310761B (en) | 1996-02-29 | 1996-02-29 | A metal electrical accessory mounting box |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997032380A1 true WO1997032380A1 (fr) | 1997-09-04 |
Family
ID=27268156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/000580 WO1997032380A1 (fr) | 1996-02-29 | 1997-02-28 | Boitier metallique pour le montage d'accessoires electriques |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2224497A (fr) |
WO (1) | WO1997032380A1 (fr) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2846476A1 (fr) * | 2002-10-28 | 2004-04-30 | Legrand Sa | Plaque support pour appareillage electrique |
FR2850521A1 (fr) * | 2003-01-24 | 2004-07-30 | Legrand Sa | Appareillage electrique a encastrer |
ES2223266A1 (es) * | 2003-03-20 | 2005-02-16 | Schneider Electric España, S.A. | Sistema de instalacion electrica. |
EP1675236A1 (fr) * | 2004-12-23 | 2006-06-28 | Legrand | Support d'appareillage électrique |
FR2885358A1 (fr) * | 2005-05-09 | 2006-11-10 | Manuf D App Electr De Cahors S | Dispositif de fermeture pour coffret avec ecran intercalaire |
US7241449B1 (en) | 1999-04-12 | 2007-07-10 | Aventis Pasteur Limited | Transferrin receptor genes of moraxella |
RU2717954C2 (ru) * | 2015-10-28 | 2020-03-27 | Легран Франс | Держатель электрического устройства |
US10992121B2 (en) | 2019-06-28 | 2021-04-27 | Abb Schweiz Ag | Adjustable mounting lug for electrical box |
FR3129788A1 (fr) | 2021-11-29 | 2023-06-02 | Mouv' Concep. | Support d'appareillage électrique |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB227099A (en) * | 1923-12-31 | 1925-07-09 | British Thomson Houston Co Ltd | Improvements in and relating to electric outlet boxes |
US4950842A (en) * | 1989-05-22 | 1990-08-21 | Menninga Mark E | Electrical outlet safety cover |
-
1997
- 1997-02-28 WO PCT/GB1997/000580 patent/WO1997032380A1/fr active Application Filing
- 1997-02-28 AU AU22244/97A patent/AU2224497A/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB227099A (en) * | 1923-12-31 | 1925-07-09 | British Thomson Houston Co Ltd | Improvements in and relating to electric outlet boxes |
US4950842A (en) * | 1989-05-22 | 1990-08-21 | Menninga Mark E | Electrical outlet safety cover |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7241449B1 (en) | 1999-04-12 | 2007-07-10 | Aventis Pasteur Limited | Transferrin receptor genes of moraxella |
FR2846476A1 (fr) * | 2002-10-28 | 2004-04-30 | Legrand Sa | Plaque support pour appareillage electrique |
FR2850521A1 (fr) * | 2003-01-24 | 2004-07-30 | Legrand Sa | Appareillage electrique a encastrer |
ES2223266A1 (es) * | 2003-03-20 | 2005-02-16 | Schneider Electric España, S.A. | Sistema de instalacion electrica. |
EP1675236A1 (fr) * | 2004-12-23 | 2006-06-28 | Legrand | Support d'appareillage électrique |
FR2880206A1 (fr) * | 2004-12-23 | 2006-06-30 | Legrand France | Support d'appareillage electrique |
FR2885358A1 (fr) * | 2005-05-09 | 2006-11-10 | Manuf D App Electr De Cahors S | Dispositif de fermeture pour coffret avec ecran intercalaire |
RU2717954C2 (ru) * | 2015-10-28 | 2020-03-27 | Легран Франс | Держатель электрического устройства |
US10992121B2 (en) | 2019-06-28 | 2021-04-27 | Abb Schweiz Ag | Adjustable mounting lug for electrical box |
FR3129788A1 (fr) | 2021-11-29 | 2023-06-02 | Mouv' Concep. | Support d'appareillage électrique |
Also Published As
Publication number | Publication date |
---|---|
AU2224497A (en) | 1997-09-16 |
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