Hohlwanddose

Abstract

Cavity wall box (1) for accommodating an electrical installation, the cavity wall box (1) comprising: a. a tubular box wall (2) extending in an axial direction from a front end (3) to a rear end (4), which at the rear end merges into a box base (5), and an installation space surrounded by the box wall (2) and the box base (5) for accommodating the electrical installation, b. a guide channel (7) extending at least partially along an outer side of the box wall (2) in the axial direction, and an adjusting screw (8) extending at least partially in the guide channel (7), which engages with a fastening tab (9), wherein the fastening tab (9) can be moved along the adjusting screw (8) by turning the adjusting screw (8), and c.a pivoting surface (11) for interacting with the fastening tab (9) such that when the adjusting screw (8) is turned in a disassembly direction, the fastening tab (9) is pivoted into a contour of the can wall (2); andd. a clamping surface (12) for clamping the fastening tab (9) against the clamping surface (12) upon further rotation of the adjusting screw (8) in the disassembly direction in a pivoted-in state.

Description

[0001] Cavity-wall boxes are essential components of electrical installations, as they allow for the secure installation of switches, sockets, and other electrical components. The box is typically secured to the cavity wall using mounting brackets attached to adjusting screws, which can be moved along the screw axis by turning the adjusting screw.

[0002] For disassembly, the set screw is usually turned in the disassembly direction, causing the fastening tab to slide off as soon as it reaches the distal end of the set screw. In this case, the tab falls into the cavity of the cavity wall and is irretrievably lost.

[0003] The prior art, as described, for example, in DE102005004005A1, addresses this problem and discloses a cavity-wall box with a captive fastening tab. The box is equipped with a holder that has a guide contour against which the tab moves during disassembly and is forced into a pivoted position, thus preventing the tab from being lost.

[0004] However, the known solutions have the disadvantage that, depending on the position of the cavity wall box in the cavity wall, the fastening tab swings back into the swung-out position, e.g. due to gravity, and the cavity wall box is therefore difficult to dismantle.

[0005] One object of the invention is to provide a cavity wall box that allows for easy disassembly. Another object of the invention is to provide a cavity wall box that is easy to manufacture.

[0006] The present invention relates to a cavity wall box for accommodating an electrical installation. The cavity wall box comprises a tubular box wall extending in an axial direction from a front end to a rear end, which transitions into a box base at the rear end. For this purpose, the box wall can comprise a flattened and / or rounded transition area. The box wall and the box base together enclose an installation space for accommodating the electrical installation. Opposite the box base there is usually an installation opening which allows access to the installation space. However, the installation opening can be closed by a cover of the cavity wall box (or similar). At the front end of the box wall, an edge of the cavity wall box can also be arranged for resting on a front side of the cavity wall, which edge projects laterally outwards from the box wall.

[0007] A guide channel extends axially along an outer side of the box wall. Furthermore, an adjusting screw is arranged at least partially in the guide channel, which engages with a fastening tab. The adjusting screw extends through the front end of the box wall, or rather through an opening in the box wall at the front end. A head of the adjusting screw, with an interface for a tool (such as a screwdriver), can be accessible via the installation opening.

[0008] By turning the adjusting screw, the fastening tab can be moved along the adjusting screw. The adjusting screw can be turned in an assembly direction, whereby the fastening tab is moved towards the front end of the can wall. If the adjusting screw is turned in a disassembly direction opposite to the assembly direction, the fastening tab is moved towards the rear end of the can wall. Depending on the design, the guide channel can have a semicircular cross-section, at least in some sections. This can serve to guide a first end of the fastening tab. The first end of the fastening tab can be rounded accordingly for this purpose. This makes it easier to guide the fastening tab.

[0009] The fastening tab is advantageously plate-shaped and has a front and a back. The front side usually points towards the front end of the can wall when assembled. The back side usually points towards the can base when assembled. The fastening tab also has an opening through which the adjusting screw engages. The opening is preferably arranged off-center on the fastening tab. Advantageously, the opening is arranged closer to the first end of the fastening tab than to a second end of the fastening tab opposite the first end. As described above, the first end of the fastening tab can be rounded. The second end of the fastening tab, however, can be angled, in particular angled towards the front of the fastening tab. This design is particularly advantageous for applications on thin walls of a cavity wall.The angled part serves to bridge the distance to the back of the cavity wall, even when the frontmost possible position of the fastening tab in the direction of the wall has been reached.

[0010] According to the invention, the cavity wall box further comprises a pivoting surface for interaction with the fastening tab. If the fastening tab comes into contact with the pivoting surface when the adjusting screw is turned in the disassembly direction, the interaction with the pivoting surface causes it to pivot into a contour of the box wall (as viewed from the axial direction). Depending on the design, the cavity wall box has a receiving space laterally adjacent to a rear end of the guide channel for receiving the fastening tab in a pivoted-in state, as described further below. The pivoting surface can be arranged opposite the receiving space in relation to the adjusting screw. Through interaction with the pivoting surface, the force introduced onto the fastening tab by turning the adjusting screw in the disassembly direction is deflected at the pivoting surface, so that the fastening tab is pivoted in.The pivoting surface can advantageously extend in the radial direction of the adjusting screw toward the adjusting screw and in the axial direction toward the rear end. Furthermore, the pivoting surface advantageously protrudes, at least in part, beyond a screw axis of the adjusting screw in the radial direction of the cavity wall box. This facilitates the application of the torque required to pivot the fastening tab in.

[0011] The fastening tab can further have a contact surface for interaction with the pivoting surface. The contact surface and / or the pivoting surface can be ramp-shaped, at least in some areas. A gradient of the ramp-shaped contact surface and / or the ramp-shaped pivoting surface can furthermore be linear, progressive, and / or degressive, at least in some areas.

[0012] According to the invention, the cavity wall box further comprises a clamping surface for clamping the fastening tab upon further turning the adjusting screw in the disassembly direction in a pivoted-in state, or after pivoting in. The fastening tab is clamped in the axial direction against the clamping surface. The clamping can be achieved by (further) turning the adjusting screw in the disassembly direction. This creates a clamping path for the fastening tab in the axial direction. The clamping surface is further preferably arranged such that it only comes into contact with the fastening tab after it has been pivoted in. This reduces the risk of the fastening tab pivoting back, e.g., due to gravitational force.

[0013] For a good clamping effect, it is also advantageous if the clamping surface extends in the axial direction. The clamping surface can be arranged parallel to the axial direction or inclined to it, in particular inclined between 1 - 15 °. If this is inclined, the clamping surface runs towards the rear end of the box wall and in the direction of the screw axis. In this way, the fastening tab is clamped further and further against the clamping surface by further turning the adjusting screw in the direction of disassembly. The clamping surface and the pivoting surface can be adjacent to one another or merge into one another. The clamping surface and the pivoting surface are advantageously at an angle of greater than 110 °.

[0014] Preferably, the clamping surface comes into contact with the first end of the fastening tab. However, it is also conceivable for the clamping surface to come into contact with the second end of the fastening tab. For a good clamping effect, the clamping surface can be arranged in the radial direction of the cavity wall box, at least in some areas, at the same radial position as the adjusting screw. This reduces the application of additional moments of force to the fastening tab and ensures clean clamping in a pivoted-in position.

[0015] Depending on the design, the set screw can have a thread-free neck at a distal end of the set screw. This is advantageously rotatably mounted in a guide opening. The guide opening can also be arranged on the stop element. The guide opening advantageously extends axially through the stop element. For ease of manufacture, it is advisable for the stop element to have a slot for lateral insertion of the set screw into the guide opening. However, the guide opening advantageously surrounds the set screw over a large part of a circumference of the set screw in the radial direction. The set screw can advantageously be inserted laterally through the slot into the guide opening and held there in a locking manner (with respect to an insertion direction of the slot).

[0016] Advantageously, the clamping surface and the pivoting surface are both arranged on the stop element of the cavity wall box. This can protrude into the guide channel. The stop element can be designed integrally with the box wall. The stop element can be arranged in the region of the box wall, and in particular in the region of the transition area of ​​the box wall. Depending on the design, the cavity wall box can further comprise a stop for the fastening tab in the axial direction. The stop can also be arranged on the stop element. The stop is advantageously arranged adjacent to a rear end of the clamping surface.

[0017] Depending on the design, the cavity wall box can have a receiving space adjacent to the guide channel for receiving the fastening tab in a pivoted-in state, which is arranged within an (outer) contour of the box wall (seen from the axial direction). The fastening tab arranged in the contour of the box wall allows the cavity wall box to be dismantled or pulled out of the wall opening. The receiving space can extend in the axial direction over the box wall and in particular over the transition area. For simple production, the receiving space is preferably designed without undercuts in the axial direction. The receiving space can be formed by a recess in the box wall towards the installation space. The receiving space can thus be delimited at least in regions by the box wall, or a wall of the recess in the box wall, and the guide channel.An edge can be arranged at least in some areas between the receiving space and the guide channel (in a direction perpendicular to the axial direction and parallel to the radial direction of the cavity wall box). Depending on the design, the edge can be flattened and / or rounded at least in some areas. Also conceivable is an at least partial flattening and / or rounding in a direction perpendicular to the axial direction and perpendicular to the radial direction of the cavity wall box. At least one of the two channel walls of the guide channel can also be designed with thin walls. If the channel wall facing the circumferential direction of the cavity wall box and the receiving space is thin-walled, this channel wall can taper towards the receiving space in a flattened manner and, in particular, can taper spirally around the adjusting screw. However, it is also possible for the receiving space not to be formed by a recess in the box wall, but merely to border the box wall. The fastening tab can, for example,be able to be pivoted into the contour of the can wall in the area of ​​the transition area of ​​the can wall and be clamped there and / or held by a holder, as described below.

[0018] Depending on the application, a supplementary holder may also be provided in the receiving space, in which the fastening tab is held in a form-fitting manner. The holder may, for example, include a locking element behind which the fastening tab locks when pivoted in.

[0019] Aspects of the invention are explained in more detail with reference to the exemplary embodiments shown in the following figures and the associated description. They show: Fig. 1 A cavity wall box according to the invention in a side view; Fig. 2 The cavity wall box according to Fig. 1 in a perspective view; Fig. 3 A section of the guide channel of the cavity wall box according to Fig. 2; Fig. 4 A section of the guide channel of the cavity wall box according to Fig. 2 with adjusting screw and a first variant of a fastening tab; Fig. 5 A section of the guide channel of the cavity wall box according to Fig. 2 with adjusting screw and a second variant of a fastening tab.

[0020] Fig. 1 and Fig. 2 shows a hollow-wall box 1 according to the invention for accommodating an electrical installation. The hollow-wall box 1 comprises a tubular box wall 2 extending in an axial direction from a front end 3 to a rear end 4, which transitions into a box base 5 at the rear end, and an installation space surrounded by the box wall 2 and the box base 5 for accommodating the electrical installation. The box wall 2 can form an angled and / or flattened transition region 6 towards the box base 5 at the rear end 4.

[0021] As shown in the detailed view of Fig. 3, a guide channel 7 extends at least partially in the axial direction on an outer side of the can wall 2. At a rear end of the guide channel 7, a receiving space 13 for receiving the fastening tab 9 in a pivoted-in state is further adjacent.

[0022] Fig. 4 and Fig. 5 each show the guide channel 7 with an adjusting screw 8 extending at least partially therein, which engages with a fastening tab 9. In Fig. 4 shows a first variant of the fastening tab 9 and in and Fig. 5 shows a second variant of the fastening tab 9, which is angled. The respective fastening tabs 9 can be moved along the adjusting screw 8 by turning the adjusting screw 8.

[0023] As in Fig.3, a stop element 10 can protrude into the guide channel. A pivoting surface 11 for interaction with the fastening tab 9 can be arranged on this. The pivoting surface 11 serves to pivot the fastening tab 9 into a contour of the can wall 2 when the adjusting screw 8 is turned in a disassembly direction and when the fastening tab 9 interacts with the pivoting surface 11. At a distal end of the adjusting screw 8, the adjusting screw 8 has a thread-free neck 14, which is rotatably mounted in a guide opening 15 of the stop element 10.

[0024] Furthermore, a clamping surface 12 can be arranged on the stop element 10. The clamping surface 12 serves to clamp the fastening tab 9 in the axial direction against the clamping surface 12 when the fastening tab 9 is pivoted in. In the pivoted in state, the fastening tab 9 is pivoted into the contour of the can wall 2.

[0025] As can be seen, both the clamping surface 12 and the pivoting surface 11 extend in the axial direction and are each arranged in the axial direction in a contour of the guide channel 7. However, the clamping surface 12 is arranged at least partially at the same radial position as the adjusting screw 8 in the radial direction of the hollow wall box 1, while the pivoting surface 11 is arranged further outwards in the radial direction of the hollow wall box 1. The pivoting surface 11 extends further in the radial direction of the adjusting screw towards the adjusting screw 8 and in the axial direction towards the rear end 4 of the box wall 2. Likewise clearly visible is the pivoting surface 11 arranged opposite the receiving space 13 with respect to the adjusting screw 8. The pivoting surface 11 is also ramp-shaped, at least in partial areas. This can have a linear gradient. Alternatively, however, it can also be progressive and / or degressive. LIST OF REFERENCE SYMBOLS 1 cavity wall box 2 can wall 3 Front end 4 Rear end 5 can bottom 6 Transition area 7 Guide channel 8 Adjusting screw 9 Mounting tab 10 stop element 11 Swivel surface 12 clamping surface 13 Recording room 14 Neck 15 Guide opening QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 102005004005A1

[0003]

Claims

[1] Cavity wall box (1) for accommodating an electrical installation, the cavity wall box (1) comprising a tubular box wall (2) extending in an axial direction from a front end (3) to a rear end (4), which merges into a box base (5) at the rear end, and an installation space surrounded by the box wall (2) and the box base (5) for accommodating the electrical installation, b. a guide channel (7) extending at least partially along an outer side of the can wall (2) in the axial direction and an adjusting screw (8) extending at least partially in the guide channel (7) and engaging with a fastening tab (9), wherein the fastening tab (9) is movable along the adjusting screw (8) by turning the adjusting screw (8), and c. a pivoting surface (11) for interacting with the fastening tab (9), so that when the adjusting screw (8) is turned in a disassembly direction, the fastening tab (9) is pivoted into a contour of the can wall (2); and d. a clamping surface (12) for clamping the fastening tab (9) against the clamping surface (12) upon further rotation of the adjusting screw (8) in the disassembly direction in a pivoted-in state. [2] Cavity wall box according to claim 1, characterized by that the clamping surface (12) extends in the axial direction, so that a clamping path of the fastening tab (9) is formed in the axial direction. [3] Cavity wall box according to one of the preceding claims, characterized by that the clamping surface (12) and the pivoting surface (11) are arranged on a stop element (10) of the cavity wall box (1), which projects into the guide channel (7). [4] Cavity wall box according to one of the preceding claims, characterized by that the pivoting surface (11) merges into the clamping surface (12). [5] Cavity wall box according to one of the preceding claims, characterized by that the fastening tab (9) has a contact surface for interaction with the pivoting surface (11) and the contact surface and / or the pivoting surface (11) is ramp-shaped at least in some areas. [6] Cavity wall box according to claim 5, characterized by that a gradient of the ramp-shaped contact surface and / or the ramp-shaped pivoting surface (11) is linear, progressive and / or degressive at least in some areas. [7] Cavity wall box according to one of the preceding claims, characterized by that the pivoting surface (11) and / or the clamping surface extend in the radial direction of the adjusting screw towards the adjusting screw (8) and in the axial direction towards the rear end (4) of the can wall (2). [8] Cavity wall box according to one of the preceding claims, characterized by that the pivoting surface (11) projects at least partially over a screw axis of the adjusting screw (8) in the radial direction of the hollow wall box (1). [9] Cavity wall box according to one of the preceding claims, characterized by that the hollow wall box (1) has a receiving space (13) adjacent to a rear end of the guide channel (7) for receiving the fastening tab (9) in the pivoted-in state and the pivoting surface (11) is arranged opposite the receiving space (13) in relation to the adjusting screw (8). [10] Cavity wall box according to claim 4, characterized by that the adjusting screw (8) has a thread-free neck (14) at a distal end of the adjusting screw (8), which is rotatably mounted in a guide opening (15) of the stop element (10).

Images