JPH0139238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a panel-embedded electrical appliance constructed using an electrical appliance that can also be mounted on a panel surface.

One example of this type of electrical equipment is the thermal overload relay, which can be installed recessed without compromising the beauty of the panel surface or harmonizing with the surroundings, and is easy to install and easy to operate. It is desired that the setting of the scale and the return operation after operation be easy.

A conventional panel-embedded thermal overload relay is constructed by fixing a panel surface-mounting thermal overload relay 1 to a mounting bracket 2 with screws 3, as shown in FIGS. 1 and 2, for example. Although the wires are not connected in advance to the screw terminals 1a of the relay 1, the front side is looked through the corresponding square holes 4a provided in the panel 4, and the mounting holes 2a of the mounting bracket 2 and the mounting holes 4b of the panel 4 are connected. are fastened together with screws 5. Connecting the wires before installation is done because the screw terminals face the front, and because of this, long wires have to be connected, resulting in a lot of wasted wire. In addition, when attaching to panel 4, the heads of screws 5 are placed on the front side of the panel for aesthetic reasons, so in the case of large panels, it is difficult to install by one person, and the heads of screws 5 are not attached to the panel. There were drawbacks such as spoiling the appearance due to the appearance on the front side.

SUMMARY OF THE INVENTION An object of the present invention is to provide a panel-embedded electrical appliance that eliminates the above-mentioned conventional drawbacks and utilizes a panel surface-mounted electrical appliance that has a good appearance, is easy to install, and has easy wiring work.

According to the present invention, the above object is to provide an electric appliance which has a rectangular box shape and has screw terminals on the back side and locking parts on both sides of the front side and can be mounted on a panel surface, and the electric appliance. A frame-shaped mounting frame that can be locked to the front side edge of a square hole provided in the panel with a window that prevents the panel from slipping out to the front side and allows viewing of the front side, and facing both sides of the back side of the mounting frame. locking arms that are integrated in this manner and have flexibility in opposing directions whose ends engage with each of the locking portions to prevent the electric appliance from moving toward the rear side; A guide part that is integrated on the back side and is divided into upper and lower parts that movably supports the electric appliance in the front and back direction and whose outer side can be inserted into the square hole, and a guide part that is provided on each of the guide parts and is provided on the upper and lower sides of the back side of the square hole. It consists of a mounting device that has retaining arms that can be engaged with spring force at the ends of the panel, and can be installed with a one-touch operation by attaching the mounting device from the front of the panel and fitting the electrical appliance from the back of the panel. This can be achieved by

Embodiments of the present invention will be described below based on the drawings. In FIGS. 3 to 9, the panel-mounted thermal overload relay 6 has recesses 6 as locking parts on both sides of the rectangular box-shaped part on the front side.
A is provided, and the mounting device 7 includes a mounting frame 7a formed by resin molding to become the front side of the panel 4, and a mounting frame 7a.
It is composed of locking arms 7b on both sides and upper and lower guide portions 7c that are integrated on the back side of the holder, and a plurality of rows of retaining arms 7d provided on each of the upper and lower guide portions 7c. The mounting frame 7a locks onto the front side edge of the rectangular box on the front side of the relay 6 to prevent the relay 6 from slipping out to the front side, and also controls the setting and setting of the operating current setting dial 6b provided on the front side. It has a window 7a1 through which the return lever 6c can be operated for return, and is formed into a frame shape that can be locked to the front side edge of the square hole 4a. The locking arm 7b is composed of a toothed end portion 7b1 that engages with the recess 6a to freely insert the relay 6 and lock it in the withdrawal direction, and an arm 7b2 that is flexible in the opposite direction. ing. The guide portion 7c faces the locking arm 7b and supports the box-shaped portion on the front side of the relay 6 movably in the insertion direction on the inside thereof, and has a U-shaped cross section so that the outside thereof can be inserted into the square hole 4a of the panel 4. It is formed in the shape of The retaining arm 7d is arranged so that the upper and lower sides are back to back, and has a tip 7d1 with an inclined surface that engages with both the upper and lower edges of the back side of the square hole 4a. It is composed of an arm 7d2 that applies a spring force. Note that the angle of the inclined surface of the tip 7d1 is selected so as to be within the tolerance range of the thickness of the panel 4.

In the above configuration, this panel-embedded thermal overload relay is installed in the panel 4 through the square hole 4a.
First, push the mounting device 7 from the front side, then push the relay 6 into the guide part 7c from the back side, and lock the retaining arm 7d to the upper and lower edges of the back side of the square hole 4a, and the locking arm 7b to the locking part 6a. It is only a simple operation of just letting the retaining arm 7d move, and since the retaining arm 7d is composed of multiple rows with spring properties, it not only looks good but also has a stable mounting condition. Although it is impossible to connect the electric wire to the screw terminal 6a of the relay 6 in the installed state as in the conventional type, it becomes possible by connecting and inserting the relay before installation. However, this is intended to be completely compatible with the panel surface mounting type for small panels or when the demand is small, and when the specific gravity or demand for the recessed type is large, the relay 8 shown in Figure 5 is used. It is better to have a dedicated series in which the direction of the screw terminal 8a is changed so that the wire can be connected from the back side.

Next, another embodiment of the present invention will be described with reference to FIGS. 10 to 12. The difference between this embodiment and the embodiments shown in FIGS. 3 to 5 is that it can be installed on panels with different thicknesses, which means that panels for power distribution boards and control centers are generally large. A 3.2mm steel plate is used for the small one.
This is due to the use of 2.3mm steel plates. Therefore, it goes without saying that the only difference in this case is the retaining arm of the mounting device 9, and the rest is the same as the embodiment shown in FIGS. 3 to 9, so only the differences will be described. The mounting device 9 has locking arms 9b and 9c alternately provided with different arm lengths, that is, two types of gaps G1 and G2 from the back side of the mounting frame 9a. When the plate thickness is t ₁ or 2.3 mm, the locking arm 9c is designed to correspond to the case where the plate thickness is t ₂ or 3.2 mm. This is because there is a difference of about 40% between the plate thicknesses of 2.3 mm and 3.2 mm, and it is extremely difficult to securely fix them to both with one type of retaining arm. Note that the angles of the inclined surfaces provided at the ends of the locking arms 9b and 9c are selected so as to absorb the tolerance range of the corresponding plate thicknesses _t1 and _t2 , similarly to the retaining arm 7d of the mounting device 7. ing. Therefore, with this configuration, similarly stable mounting conditions can be obtained for panels of two different thicknesses. In this embodiment, there are two types of plate thickness, 2.3 mm and 3.2 mm, but it goes without saying that the plate thickness is not limited to this and two or more types can be used.

The above embodiments are all examples of application to thermal overload relays, but the point is that at least the front side is square box-shaped, with parts that require inspection, adjustment, settings, etc. placed on the front and connected on the back. The present invention can be applied to any electric appliance provided with a terminal, and the rectangular hole drilled in the panel for attachment is not necessarily for one piece, but can also be attached to a horizontally long hole corresponding to the number of pieces.

As described above, according to the present invention, by providing locking portions on both sides of a panel-mounted electrical appliance, all that is required is to prepare a mounting device to be mounted on the panel from the front side. It is possible to obtain a panel-embedded electrical appliance that has a good appearance and is easy to work with, and also contributes to the common use of parts between series.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of a conventional panel-embedded thermal overload relay, Fig. 2 is a front view of Fig. 1, and Fig. 3 is a panel-embedded thermal overload relay according to the present invention. Figure 4 is a front view of Figure 3, Figure 5 is a side view of a modification of the main parts of Figure 3, and Figure 6 is an exploded view of the main parts of Figure 3. A perspective view, FIG. 7 is a perspective view of the mounting device 7 of FIG.
The figure is a sectional view of the mounting device 7 taken along the line A-A in FIG. 4, and FIG. 9 is a sectional view of the mounting device 7 taken along the line B-B in FIG. 4.
FIG. 10 is a perspective view of a mounting device corresponding to FIG. 7 of another embodiment of the panel-embedded thermal overload relay according to the present invention, and FIG. 11 is FIG. 8 of FIG. 10. 12 is a sectional view corresponding to FIG. 9 of FIG. 10. 4... Panel, 4a... Square hole, 6, 8... Thermal overload relay as electrical equipment, 6a... Recess as a locking part, 6d, 8a... Screw terminal, 7, 9
...Mounting device, 7a, 9a...Mounting frame, 7a1...
...window, 7b...locking arm, 7b1...end, 7c...
...Guide part, 7d, 9b, 9c... Removal prevention arm, 7d1
...Tip.

Claims (1)

[Scope of Claims] 1. A rectangular box-shaped electric appliance that has screw terminals on the back side and locking parts on both sides of the front side and can be attached to a panel surface, and the front side of the electric appliance. A frame-shaped mounting frame that can be locked to the front side edge of a square hole provided in the panel with a window that prevents it from slipping out to the side and allows viewing of the surface, and a frame-shaped mounting frame that faces both sides of the back of the mounting frame. opposing flexible locking arms that are integrated with each other and whose ends engage with each of the locking portions to prevent movement of the electrical appliance toward the rear side; a guide part that is integrated into an upper and lower part and supports the electric appliance in a front-back direction movable manner and whose outer side can be inserted into the square hole; a guide part provided in each of the guide parts on the upper and lower sides of the back side of the square hole; It consists of a mounting device with a retaining arm that has a spring force at the tip and can be engaged, and can be installed with a one-touch operation by attaching the mounting device from the front side of the panel and fitting the electrical appliance from the back side of the panel. A panel-embedded electrical appliance characterized by: 2. In what is stated in claim 1,
A panel-embedded electrical appliance characterized in that each of the retaining arms is divided into a plurality of rows. 3 In what is stated in claim 2,
A panel-embedded electrical appliance, characterized in that the length of each of the retaining arms divided into the plurality of rows is changed so that the electrical appliance can be attached to different thicknesses of the panel. 4. A panel-embedded electrical appliance according to any one of claims 1 to 3, characterized in that the screw terminal is provided so as to be screwable from the rear side. 5. In any one of claims 1 to 4, the locking portion is a recess, and the end of the locking arm is configured to allow the electrical appliance to be freely inserted, making it impossible to pull it out. A panel-embedded electrical appliance characterized by being formed in a toothed shape.