FI82570B - Electrical installation device and method for its manufacture - Google Patents

Description

1 82570 Electrical installation device and its manufacturing method

The present invention relates to a method of manufacturing an electrical installation device and to the installation device itself according to the characteristic features indicated in the preamble of claim 12.

Such mounting devices are known, for example, from DE-PS 849 259 or DE-OS 24 20 017. They are used to attach electrical switches, 10 sockets, etc. to a wall outlet to which electrical power cords are connected. The mounting device comprises a device stand supporting the wall mains cable and external connection and operating elements, as well as a support ring for fixing this device stand to the wall box. Thus, in addition to the connection terminals, the device stand includes, for example, an electrical switch equipped with a tilt contact or plug contacts for a plug. It may be possible to use protective covers or attach sockets to the device stand to receive the plug.

20 After connecting the cables, place the device stand inside the wall box on the terminals and secure it in place with a support ring. For this purpose, the tire usually has two spacer claws movably attached to the support grip holder. By tightening the screw, the end of which is generally pressed against the shorter inner lever portion of the support nail, the longer nail arm is pressed outwardly into a fixed position on the inner wall of the box.

The electrical installation devices according to the above-mentioned patents have certain disadvantages both in terms of their manufacture 30 and their installation. However, in the mounting device according to DE-OS 24 20 017, the support ring is formed of a simply made bent stamped part, in which case the screws securing the spacer nails to the wall box act together with a threaded sleeve in the device base formed as a special component. This sleeve thus does not form an immediate part of the carrier ring, which results in the high installation, material and thus also overhead costs associated with the manufacture and assembly of such a series-produced product.

However, DE-PS 849 259 discloses a carrier ring for an electrical installation device with a one-piece nut for intermediate nail clamping-10 screws, this nut being provided with a threaded hole formed by a special manufacturing step. The length of the threads then corresponds only to the thickness of the plate-like starting material, so that their mechanical strength remains rather low. In addition, the position plane of the fold portion formed by the thread-15 hole is approximately perpendicular to the thread direction. Thus, when the fastening screw is tightened, a large pull is applied to the folding part.

It is an object of the present invention to obviate the disadvantages associated with these known mounting devices; by means of a method of manufacturing an installation device in connection with which the manufacturing costs are reduced, the finished installation device according to the invention also being better suited for its intended use.

This object is achieved by a method of manufacturing an electrical installation device according to the invention described in claim 1. First, a plate blank for the final manufacture of the carrier ring of the mounting device is stamped in a known manner from a planar material in the form of a strip or plate, such as a metal plate or the like. A similar malleable plastic material can also be used as such a starting material. When unfolded, the sheet blank comprises at least one flat annular flange and two or more strips of material placed against the inner edge of the flange part forming the spacer nail holder at the end of the manufacture. At the end of the manufacture, sleeve plates forming a threaded sleeve are formed on the inner ends of these strips by means of intermediate strips. Mainly simultaneously with the performance of stamping for the production of these billets, threaded portions are formed in the sleeve plates by a chipless design, these threaded portions forming the threads of the threaded sleeve 10 in the final state of manufacture of the mounting device. In the related manufacturing step, these strips of material are bent approximately rectangularly with respect to the flange plane for the manufacture of the spacer nail holder and each spaced apart side edge of the sleeve plates is moved together with threaded sleeves with internal threaded portions arranged approximately at right angles to their longitudinal axis. Before installing and attaching the support ring on the device stand, the fixing screws are screwed into the threaded sleeves, the inner ends of which are fixed to the spacer nails movably placed in the support gripper-20 holder of the mounting device.

An essential advantage of the method according to the invention is that it omits one or more manufacturing steps, in connection with which the nut thread required for the fastening screws should be used due to the additional parts used. Instead, the method according to the invention uses only simple stamping, embossing and bending steps, which can be carried out in a particularly simple manner in automatic machines. In addition, it is expedient to use a structural element fixedly fixed to the support ring for each nut 30 of the support rod holder, since it no longer needs to be fitted in particular during the installation of the electrical mounting device, for example by means of a contact holder. This also provides an advantage when considering the cost of final installation of the device in a wall box.

In addition, the use of tongues formed alternately between the recesses in the openings on the spaced apart side edges of the sleeve plates creates the conditions - without the need for any additional manufacturing steps - for the threaded sleeve to be particularly well deformable at the end of manufacture.

This is achieved according to claim 3, in that by connecting the spaced-apart side edges of the sleeve plates, the alternating tabs on one side edge are inserted into the opening recesses of the opposite side edges. In this case, a toothing effect is achieved, the essential advantage of which is that the reaction forces occurring during the tightening of the fastening screws for spreading the spacer nails are introduced into the support ring by means of a one-piece structure of support grippers and nuts formed by threaded sleeves. In mounting devices made with the prior art, such forces are received by the insulating material of the device base, which is not intended for this purpose. In addition, the threaded sleeve becomes particularly durable thanks to the toothing.

25 To allow trouble-free operation of the spacer nails, the longitudinal axis of the fastening screws must be located inside the plane of the support gripper. This is achieved by means of the manufacturing technique according to the invention in a particularly simple manner, so that the spacers between the strips of material-30 of the support gripping holder and the threaded sleeve are bent inwards.

Claims 6 to 9 deal with further variations of the method according to the invention, by means of which additional manufacturing technical advantages are achieved. Especially sleeve-35

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5 The connection of 82570 plates to a threaded sleeve is simplified when each sleeve plate is bent along two bending lines into a threaded sleeve having an approximately equilateral triangular cross-section. Namely, bending along one bending-5 line by means of a tool edge is generally very effortless to perform when a flat plate has to be formed into a slender cross-section by means of a cylindrical tool. Instead of a triangular cross-sectional shape, a rectangular cross-section 10 can also be chosen by using a correspondingly larger number of bending lines.

When using the triangular cross-sectional shape of the threaded sleeve, it is sufficient, as stated in claim 7, that each threaded part is placed only in the central region of the individual rectangular parts of the bending lines of the sleeve plates 15.

Claims 8 to 10 provide different possibilities for shaping the threaded parts in the sleeve plates. The groove 20 according to claim 8 provides, above all, metric threads in the spreading screw, thus ensuring close contact between the threads of the two cooperating components in connection with high transfer forces, which enables a particularly strong fastening of the mounting device to the wall box.

The shapes for threaded blanks described in claims 9 and 10 make it possible to use simple sheet metal screws with a large pitch and depth, for example in connection with vehicle body structures, for fastening spacers.

In a variant of the method according to the invention, as described in claim 11, strips running parallel to the material strips formed by the support gripping holder are formed simultaneously with the stamping of the blank plate - and thus without additional manufacturing costs. These strips of strip-35 6 82570 can be bent inwards from their free ends to secure the carrier ring to the equipment base after the blank has been folded into a carrier ring and once the device base has been installed.

Claim 12 describes the characteristic features of an electrical installation device manufactured by the method according to the invention. It also fulfills the above-mentioned inventive purpose, since the fixing screws receive, the nuts are formed as integral stamping bending parts of the carrier-10 ring, the internal threads of which are made by a non-cutting working method. The advantages obtained in this way correspond substantially to the advantages stated in connection with claim 1. Manufacturing advantages are achieved by the design of the internal thread by means of an unprocessed working method. By forming the nuts in one piece as stamping parts with the support ring, a further improvement is further achieved. The nut no longer needs to be placed as a special component in the carrier gas or contact holder. By using the installation device 20 according to the invention, the electrical installation can thus be rationalized. In particular, it should be noted that this eliminates the often cumbersome search for fallen nuts. The mounting device according to the invention is also, despite its simple method of manufacture, of a particularly strong construction and is capable of transmitting high holding forces to its wall ring in its wall box without having to worry about the nut threads breaking or the device bending.

The characteristic parts 30 of claims 13 to 17 describe preferred variations of the mounting device in which the durability, internal stability and tightening capacity of the nuts receiving the fastening screws are improved. Thus, according to claim 13, internal threads can be formed more than once; 35

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7 82570 of individual threaded parts, the shape of which may advantageously be different depending on the type of screw used.

The triangular nut of the cross-sectional wall described in claim 14 is particularly simple to manufacture by means of stamping and pressing.

In an embodiment of the mounting device according to claims 15 and 16, the nuts of the support ring achieve a particularly good durability both in themselves and also due to the shape rigidity of the connection between them and the support gripping holders.

Claims 18 to 20 characterize in a characteristic manner possible alternative applications of the threaded parts. All said possible applications 15 can be realized in a simple manner by means of compression and stamping.

In connection with claims 22 and 23, steps are taken by means of which the device stand can be fastened to the support ring of the mounting device in a particularly rational manner. In addition, the device stand can be reliably attached to the carrier ring in the desired position by means of the measures according to claim 24.

Embodiments of the apparatus and method of the present invention will now be described with reference to the accompanying drawings, in which:

Figure 1 shows a plan view of a stamped blank before it is folded;

Figure 2 is a plan view of a carrier ring made of a blank sheet as seen from the flange side; Fig. 3 shows a section taken along the line III-III in Fig. 4;

Fig. 4 shows a side view of the carrier according to Fig. 1, partly in section along the line IV-IV in Fig. 2; 35 8 82570

Figure 5 shows a longitudinal section and a side view of a mounting device according to the invention;

Fig. 6 shows a detailed plan view of a pre-folded sleeve plate of an unfolded plate blank; Fig. 7 shows a longitudinal section of a nut made of the sleeve plate according to Fig. 6;

Figure 8 shows a cross-section of the nut of Figure 7;

Figure 9 shows a detailed plan view of an alternative embodiment of the sleeve plate 10;

Fig. 10 shows a longitudinal section of a nut formed from the sleeve plate of Fig. 9;

Figure 11 shows a cross-section of the nut of Figure 10; Fig. 12 shows a detailed plan view of a sleeve plate of a plate blank according to another alternative embodiment;

Fig. 13 shows a longitudinal section of a nut formed from the sleeve plate of Fig. 12; and Figure 14 shows a cross-section of the nut of Figure 13.

The method for manufacturing the electrical installation device is described below with reference to Figs. 1 to 5. The starting material is a strip-like metal-25 plate, from which plate blank 1 is first made by means of a suitable stamping tool (Fig. 1). This blank comprises a substantially flat annular flange 2, in the middle of which, in the final state of manufacture of the mounting device, an opening of the device stand 3. Longitudinal holes 4 are made on both opposite flat sides of this substantially square flange 2 with rounded corners. with screws or to fasten the cover.

Flange 2 is on each opposite inner edge-35

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9 82570 I obtain 5, 5 'provided with U-shaped strips 6,6', the U-branch-shaped ends 7, 7 'of which are made in one piece with the inner edges 5, 5'. In the openings 30, 10 'surrounded by the U-branches 8,8' and the U-bases 9, 9 ', spacer nails are placed 5 at the end of the manufacture (see also Fig. 5).

The intermediate strips 11, 11 * associated with the U-bases 9, 9 'of the material strips 6, 6', which taper away from said U-base 9, 9 'in a trapezoidal manner. The spacers 10, 11 'extend as far as the sleeve plates 12, 12'. These plates are made mainly rectangular and their longitudinal axis is transverse to the direction of the U-branches 8, 8 'of the strips 6, 6'. Formed on both spaced apart narrow sides 13, 13 'are spaced apart tongues 14 with apertures 15 between them. It is important that the tabs 14 and recesses 15 on one narrow side 13 alternate between the narrow side 13' of the spaced apart sleeve plate 12. with tabs 20 and recesses contained in. At the same time as the blank 1 is stamped from the strip material, threaded portions 17 are embossed on the upper surface of the sleeve plate 12, 12 'in three adjacent approximately equal rectangular areas 16. These portions may include, for example, as shown in Fig. 1, an oblique groove (see also Figs. ).

The sheet blank 1 is bent in several individual steps along the bending line already shown in Fig. 1 along the bending line and (19 ', 19 ", 19'") to form a support ring 20. Flange 2 remains mainly in its flat annular shape. Only the inner edge 5 is turned to stabilize and stiffen it (Fig. 3). When the sheet blank 1 is bent along the bending lines 19 'at the edges, the strips 6, 6' are bent approximately at right angles to the flange plane on the same side. The material strips 6, 6 'thus form support gripping holders 21, 21', in the opening 10, 10 'of which spacer nails 22, 22' formed in the manner of an angle lever are inserted (Fig. 5). The spacer nails 22, 22 'themselves include a long outer lever arm 23 which moves completely outward, performing the spreading movement in the direction of the support gripping nail by squeezing the inner short lever arm 24, and by means of this outer lever arm 10 the carrier ring 20 can be fixed to the wall box.

The intermediate strips 11, 11 'are bent inwards at their edge areas along the bending lines 19 ".

In a further manufacturing step, the sleeve plates 15 12, 12 'are bent together along bending lines 19 "into a threaded sleeve with an equilateral triangular cross-section, which forms nuts 25,25' for receiving fastening screws 26. The nuts 25, 25 'thus contain mainly strips 6, 8' , 8 ', the fastening arms 27, 27' extend in the plane 20, both bending arms 28, 28 'being bent away from this plane at an angle of about 60 ° in each direction, this bending outwards so far that both the sleeve plates 12, 12' the narrow sides 13, 13 'come into abutment position 25 against each other to form a triangular cross-section.Due to the alternating arrangement of the tabs 14 and the recesses 15, the tabs 14 on one narrow side 13 engage the recesses 15 on the opposite narrow side 13'. add until they come closed in the opposite art branch 28 , 28 'against the outside 29. Through the bending of the sleeve plate, the threaded parts 17 become triangular in cross-section in the radial direction closest to the longitudinal axis of the nuts 25, 25 '. In this case, the fastening screws 26, 26 'can be fastened to the threaded parts 17 and can be screwed on. The ends 30 of the fastening screws 26 then press the inner lever arm 24 of the spacer nails 22, 22 '. By means of the fastening screws 5 of the fastening screws 26, 26', the spreading movement of the spacer nails 22, 22 'can thus be performed.

Figure 5 shows an electrical installation device ready for installation in a wall box. The device stand 31 is placed on the support ring 20 from its rear side 32 and is supported by a circumferential projection 33 on a support edge 34 formed by the U-base 9, 9 'of the support grip holder 21, 10 21'. This allows the device stand 31 to be secured against forward movement. In order to prevent rearward movement, the insulating housing of the device base 31 is provided in the region of the support gripping holder 21, 21 'with diagonal slots 15. In the assembly position these flanges are compressed away from the rear side 32 of the strips 36, these strips being in one piece. 'with both pages. When the device stand 31 is placed in the support ring 20 20, the free ends 37 in the direction of the flange 2 of the strips 36 are bent inwards, whereby a compression situation against the oblique flanges 35 shown in Fig. 5 arises.

Figures 6 to 8 show a first embodiment of the threaded parts 17. As already described above, these parts 25 are formed as grooves 18 in the rectangular region 16 of the sleeve plate. The threaded parts 17 act as calibrated internal threads 38 together with the fastening screw 26.

The drawings do not show an alternative embodiment in which the threaded parts are made approximately square in cross-section by means of one sor-30 pin, in which case the nut thus formed is used in a three-dimensional manner. The sharp edges of this pin then act as threads. This alternative application is particularly well suited for use when 35 12 82570 sheet metal screws with a large thread depth are used. This variation has been further developed in the embodiment shown in Figures 9-11. In this case, the threaded parts 17 comprise ul-5 machines arranged obliquely on the sleeve plate 12, which are formed as small stamped parts made from the plane of the sleeve plate 12 and then bent.

A further alternative is shown in Figures 12 to 14, in which the threaded parts 17 comprise a series of adjacent obliquely arranged longitudinal stamping slots to which the deep threads of the sheet metal screw 39 are attached.

The detailed figures shown in Figures 6 to 14 show particularly clearly, in addition to the precise representation of the threaded parts 17, also the tongues 14 and the recesses 15.

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Drawing markings 1 Plate blank 2 Flange 20 3 Hole 4 Longitudinal hole 5.5 'Inner edge 6.6' Material strip 7.7 'U-branch ends 25 8.8' U-branch 9.9 'U-base 10.10' Hole 11 , 11 'Spacer 12,12' Sleeve plate 30 13,13 'Narrow side 14 Tongue 15 Hole recesses 16 Rectangular area 17 Threaded part 35 n 82570 18 Groove 19,19' Bending line 20 Support ring 21,21 'Support grip holder 5 22,22' Spacer claw 23 Lever arm 24 Lever arm 25.25 'Nut 26 Mounting screw 10 27.27' Mounting branch 28.28 'Folding branch 29 Outer side 30 End 31 Device stand 15 32 Rear side 33 Cantilever 34 Counter edge 35 Diagonal flange 36 Strip 20 37 Free end 38 Internal thread 39 Sheet metal screw 40 Protrusion 41 Punch slot 25

Claims (24)

1. A method of manufacturing an electrical installation device, e.g. a wall outlet, a light switch 5 or the like, characterized in that the device consists of at least - a barring (20) for securing the installation device in a wall box; and - a down socket (31), and the method comprises the following steps: metal plate or the like, a plate blank (1) forming in the manufacturing end state is punched, which in the flat state has at least: 15. a pian, annular flange (2), clamping brackets (21, 21 ') forming, on the inner edge (5, 5') of the flange part (2) in opposite positions, preferably U-shaped material bodies (6, 6 '), and 20 - on the inner ends (U-shaped). the base 9, 9 ') of the material body (6, 6') via intermediate sleeves (11, 11 ') fixed in the manufacturing end condition a respective socket sleeve (nut 25, 25') forming sleeve plates (12, 12 ·); - then, at the same time as the stamping work on the sleeve plates (12, 12 ') of the plate blank (1) in the manufacturing end state, the screw threads on the threaded sleeves (nuts 25, 25') forming threads (17) are introduced by a shaping without cutting; the material body (6, 6 ') is bent approximately at right angles to the plane of the flange to form the clamping bracket (21, 21'); - the side edges (narrow sides 13, 13 ') facing away from each other on the sleeve plates (12, 12') are joined to a threaded sleeve arranged generally in the longitudinal axis relative to the flange plane (nut 25, 21 82570 25). screwed into the threaded sleeves (nuts 25, 25 ') and fastening screws (26) respectively, which actuate the inner ends of the clamping brackets (21, 21') which are movably inserted. and the bearing ring (20) down plinth (31) is inserted and secured. 2. A method according to claim 1, characterized in that in the punching work on the side edges (narrow sides 13, 13 ') of the sleeve plates (12, 12') in a complementary manner or protrusion, between the recesses (heel). 15) forming tongues (14) are formed. Method according to claim 2, characterized in that when the side edges (narrow sides (13, 13 ') of the sleeve plates (12, 12') are facing together to form the threaded sleeves (nuts 25, 25 ') ) in a complementary manner, the respective protruding tongues (14) on a side edge (a narrow side 13) are inserted into the recesses (the heel 15) on the opposite side edge (the narrow side 13 '). 4. A method according to claim 3, characterized in that, in order to ensure that the threaded sleeves (nuts 25, 25 ') are not clamped, the tongs (14) are preferably bent so long that they lie parallel to the threaded sleeve (nut 25, 25'). ) outer side (29). Method according to any of the preceding claims, characterized in that the intermediate shaft (11, 11 ') between the material body (6, 6') and the threaded sleeve (nut 25, 25 ') is stitched in mesh, so that they are displaced in parallel. in relation to the clamping brackets (21, 21 '). Method according to any of the preceding claims, characterized in that the sleeve plates (12, 12 ') for forming the threaded sleeves (nuts 25, 25') are bent along two parallel to their lateral edges (narrow sides 13, 13 '). ), the sleeve plates (12, 12 ') in three adjacent rectangular sections (16) adjacent to each other with approximately the same dimensions dividing bending lines (19' ') in such a way that the threaded sleeves (nuts 25, 25') in their cross-section essentially shaped into an equilateral triangle. 5 7. A method according to claim 6, characterized in that the thread members (17) are inserted into the center region of the respective rectangular section (16). Method according to any of the preceding claims, characterized in that the thread parts 10 (17) are informed as to a groove embossing (18) in the sleeve plates (12, 12 '). Method according to any one of claims 1-7, characterized in that the thread parts (17) are provided diagonally arranged over the sleeve plates (12, 12 ') for projections (40). Method according to any of claims 1-7, characterized in that the thread parts (17) are informed as serially arranged punch recesses (41) in the sleeve plates (12, 12 '). 20 11. A method according to any of the preceding claims, characterized in that when the plaque (1) is punched parallel to the forming tabs (36) forming the material claws (21, 21 ') forming adjacent tabs (6, 6'), which after the bend of the blank (1) to the support ring (20) and the insertion of the down socket (31) with its free ends (37) are bent inwardly to secure the down socket (31) to the support ring (20). 12. Electrical installation device, e.g. wall sockets, light switches or the like, for mounting in a wall socket with - a connection contacts for the wall distribution lines and the external connection and outlet respectively. the actuating members supporting the down socket (31) and a support ring (20) which secures said down socket (31) to the wall box and comprises; II 23 8 2 5 7 0 - a flat, annular flange (2) which, in the mounting position 1, lies substantially planar parallel to the wall along its edge region, - at least approximately at right angles from the lower edge of the flange (2) ') In the wall box inserting, with the flange indelibly joined clamping brackets (21, 21'), in each respective heel (10, 10 ') a clamping claw (22, 22') is movably inserted; - on the clamping brackets (21, 21 '), the respective ends of indiscriminately shaped nuts (25, 25') of each respective end of the clamping brackets (21, 21 ') are arranged to receive a respective fastening screw (26) at right angles to the flange plane along their longitudinal axes. , characterized in that the nuts (25, 25 ') are formed by the stamping bend portions indivisibly joined by the bearing ring (20), the lower thread (38) of which is informed by a non-cutting workpiece machining. Installation device according to claim 12, characterized in that each lower thread (38) 20 is composed of several separate thread parts (17). Installation device according to claim 12 or 13, characterized in that the nuts (25, 25 ') 1 in a cross-section 1 are substantially formed into an equilateral triangle, in which the legs of the thread portions (17) are informed to form the inner thread. (38). Installation device according to Claim 14, characterized in that a leg of the nut (25, 25 ') as a fastening leg (27, 27') - is indivisibly connected to the clamping bracket (21, 21 ') via an intermediate life (11, 11'). ); and - extends parallel to the clamping bracket (21, 21 '). Installation device according to claim 15, characterized in that the bendable legs (27, 27 ') fixed on both sides of the fastening leg (27, 27') to the nut (25, 25 ') at their free ends on a complementary 24 82570 means have tongues (14) and recesses (15), which mutually, preferably with a shape reading, engage in the recesses (15) formed by the tongues (14) of the opposite bending leg (28, 28 '). Installation device according to claim 16, characterized in that the free ends of the tongues (14) of a bending leg (28) are bent, so that they are parallel to the outside (29) of the respective opposite bending leg (28 '). Installation device according to any of claims 12-17, characterized in that the respective thread parts (17) comprise a groove embossing (18). Installation device according to any of claims 12-17, characterized in that the respective thread parts (17) are formed by projecting projections (40) from the inner sides of the nut legs (27, 27 ', 28, 28'). Installation device according to any of claims 12-17, characterized in that the respective thread parts (17) are formed by punch holes (41) inserted in the nut legs (27, 27 ', 28, 28'). Installation device according to any one of claims 12-20, characterized in that the longitudinal axes of the respective nuts (25, 25 ') are plunged parallel to the side of the clamping brackets (21, 25' ') by the shaft (21, 25'). inwards. Installation device according to any one of claims 12-21, characterized in that the side edges perpendicular to the flange plane on the clamping brackets (21, 21 ') on their sides are provided with indivisibly fixed bending flaps (36), which face towards the flange (2) free ends (37) in the down position of the down socket (31) abut the same. Installation device according to Claim 22, characterized in that the down plinth (31) in the abutment area of the respective bending flaps (36) has an inclined shoulder (35). An installation device according to any one of claims 12-23, characterized in that each clamping bracket (21, 21 ') chosen to turn its free end facing away from the flange (2) one rests one against the bracket (33) on the socket (31). ) abutable, substantially parallel to the abutment edge (34) of the flange plane.