JP4320981B2 - Door handle device for electrical equipment panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrical equipment panel with a door such as a switchboard that houses electrical equipment in metal casings that are installed adjacent to each other with different grounding types, when the doors of those panels are closed. The door handle that opens and closes the door is operated at the same potential as the grounded housing, and the door is opened and closed safely. When the door is open, it is adjacent even if the door handle and the door handle come into contact with each other. The present invention relates to a door handle device for an electrical equipment panel that prevents ground contact between the panels.
[0002]
[Prior art]
In general, a casing constituting an electrical equipment panel such as a switchboard is made of metal having a rectangular parallelepiped shape as a whole, and a door for opening and closing is provided on one surface of the rectangular parallelepiped. The door surface is provided with a door handle for opening and closing at either the left or right end when facing the front of the housing, and the door has an opening and closing rotating shaft (hinge) connected to the housing side plate at the end opposite to the door handle. I have. In addition, a rod for locking (locking) linked to the movement of the door handle by a link mechanism is provided inside the door. The casing, door, door handle, link mechanism, rod, hinge, etc. are all made of metal and are electrically conductive and connected to each other, so they are always connected to each other when the door is closed and open. Is in an electrically connected state.
[0003]
Each electrical equipment panel is grounded on the casing of the panel according to safety requirements, such as Class A and Class C.
[0004]
4, 5 and 6 show examples in which a plurality of conventional electrical equipment panels having different grounding types are arranged close to each other.
[0005]
FIG. 4 shows an example in which the electrical equipment panel 1 and the electrical equipment panel 2 that are each grounded with Class A and Class C are arranged side by side with no space therebetween. Insulating material 7 is sandwiched between the boards in order to avoid contact with the ground due to direct contact between the side plates of both boards. When both the panel 1 and the panel 2 are closed, there is no inconvenience and there is no safety problem. However, for maintenance and inspection of the internal electrical equipment, the doors 12 and 22 of both panels as shown in the figure. Are simultaneously opened, the door handle 23 of the narrow door 22 of the panel 2 may come into contact with the surface of the wide door 12 of the panel 1. Normally, the doors and door handles of each panel are electrically connected to a grounded housing and placed at the same potential, so the type of panel grounding depends on the contact between the doors and door handles between different panels. If they are different, there is a risk that a ground contact will occur between the two boards.
[0006]
FIG. 5 shows another example in which the electrical equipment panel 3 and the electrical equipment panel 4 to which grounding of A type and C type is applied are arranged close to each other with an insulating material 7 interposed between the panels. Since the doors have the same width, the door handles 32 and 42 come into contact with each other when the doors are opened, and there is a risk of causing contact between different types of grounding as in the example of FIG.
[0007]
When electrical equipment panels with different types of grounding are arranged side by side in this way, contact between different types of grounding will occur due to opening and closing of the door, so to avoid this, even if the door is opened to the opening limit, it will not contact each other In some cases, two boards are installed with a sufficient interval. FIG. 6 shows a specific example thereof, so that the electrical equipment panels 5 and 6 that are respectively grounded in Class A and Class C do not come into contact even when the doors 51 and 61 of both panels are opened to the opening limit. It is installed with a sufficient distance L between the two devices.
[0008]
If there is not enough space for installation, a special handle with the door handle surface covered with an insulating material may be used.
[0009]
When the electrical equipment panels having different grounding types are installed adjacent to each other, the conventional methods as described above have disadvantages. That is, in the method of adjoining the insulating material between the panels (FIGS. 4 and 5), there is a problem that the door and the door handle or the door handles come into contact with each other when the door is open, In the method of installing the door 3 at a sufficient interval so as not to contact even when the door 3 is opened to the opening limit (FIG. 6), a large installation space is required. In addition, the method of covering the surface with an insulating material uses a special handle, so that there is a difficulty in versatility.
[0010]
[Problems to be solved by the invention]
It is an object of the present invention to reduce the installation space of a panel when arranging a plurality of electrical equipment panels such as switchboards having different grounding types, and to enable safe operation when the door is closed. When the handle is grounded and the door is open, the door handle is installed so that there is no risk of ground contact between the panels even if the door handles and doors between adjacent panels contact each other. An object of the present invention is to provide a door handle device for an electrical equipment panel that is insulated from the body.
[0011]
[Means for Solving the Problems]
To achieve the above object, the present invention provides an electrical equipment panel in which electrical equipment is housed in a grounded metal door-equipped housing, and the door handle for opening and closing the door is electrically insulated from the door. And a lock member that is attached to the lock position and the unlock position so as to be rotatable, and is electrically and mechanically connected to the door handle, and is displaced in conjunction with the rotation of the door handle, and is integrated with the housing. The front end of the lock member is contact-engaged at the door handle lock position to lock the door to the housing and form an electrical connection between the door handle and the housing, and unlock the door handle. A lock mechanism comprising a lock member receiving part for releasing the door lock by releasing the position and disconnecting the electrical connection between the door handle and the housing, and closing the door Click the door handle while is placed on the housing at the same potential, the door handle can be made to be insulated from the housing in a state of unlocking the door.
[0012]
Further, the lock member in the door handle device of the electrical equipment panel comprises a metal rod that has one end connected to the door handle and the other end extending to the vicinity of the upper and lower ends of the housing, and moves up and down as the door hand rotates. The door may be supported by an insulating material so as to be vertically displaceable, and the lock member receiving portion may be formed by a bent flange portion at the upper and lower ends of the housing.
[0013]
Furthermore, in the door handle device of the electrical equipment panel, the lock member is electrically and mechanically connected to the door handle, and the other end extends to the vicinity of the side edge of the housing, and rotates together with the rotation operation of the door handle. The lock member receiving portion can be formed by a bent flange portion at the side end of the housing.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A housing of an electrical equipment panel such as a switchboard is generally made of metal and has a rectangular parallelepiped shape as a whole, and has a single-open or double-open rotary door (door) on one surface of the rectangular parallelepiped. The door has a door handle for opening and closing at the end of either the left or right door surface toward the front of the housing, and the door has an opening and closing rotating shaft (hinge) connected to the housing side plate at the end opposite to the door handle. I have. The door handle refers to a handle portion for opening and closing the door. Hereinafter, a portion including the entire lock mechanism that performs a series of opening stoppers (locks) interlocked with the operation of the door handle is referred to as a door handle portion.
[0015]
1 to 3 show an embodiment of a door handle device according to the present invention. FIG. 1 is a front view of an electric equipment panel, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is an enlarged sectional view taken along line BB in FIG.
[0016]
In FIG. 1 to FIG. 3, reference numeral 10 denotes an electric equipment panel, and reference numeral 101 denotes a casing that forms an outer casing of the electric equipment board 10. A one-sided door 102 is provided on the front surface of the housing 101, and a metal door handle 103 for opening and closing the door is provided at an intermediate portion from the left end of the door 102.
[0017]
The door handle 103 passes through the metal door 101 via an insulating bush 103A and is fixed to the metal door 101 by a fixing nut 103D via insulating washers 103B and 103C. The door can be rotated between a position where the door is locked and a position where the door is unlocked (approximately 90 °). Thereby, the door handle 103 is electrically insulated from the door 101 by the metal structure which consists of the handle lever 110 (refer Fig.3 (a)).
[0018]
On the door inner surface side (inside of the housing) of the door handle 103, a locking upper rod 151 (metal) that is linked to the rotation of the door handle 103 via a link mechanism (not shown) and slides in the opposite direction to each other. And a lower rod 152 (made of metal) (see FIGS. 1 and 2). The upper rod guide 161 made of an insulating material and the lower rod guide 162 made of an insulating material are fixed to the upper rod guide mounting material 171 and the lower rod guide mounting material 172 fixed to the inside of the door 102 by nut tightening, respectively. The upper rod guide 161 made of an insulating material and the lower rod guide 162 made of an insulating material are provided with holes through which a metal rod passes and slides. Both the upper rod 151 and the lower rod 152 are supported by the upper rod guide 161 and the lower rod guide 162, whereby the posture of the rod during the vertical sliding motion is held vertically (see the enlarged view of FIG. 2).
[0019]
When the door 102 is closed and the door handle 103 is rotated to the locked position and the upper rod 151 and the lower rod 152 are slid upward and downward to the full locked position, as shown by the dotted line in FIG. 151 and the lower rod 152 are engaged (locked) with the bending flange portions 101A and 101B on the ceiling plate side and the bottom plate side of the casing 101 serving as a receiving portion of the rod, and the door is locked to the casing 101. While being prevented from opening, both rods are electrically connected to the housing 101. As a result, the door handle 103 is electrically connected to the casing 101 grounded via both rods, and is in the same potential (ground potential) state as the casing.
[0020]
Further, when the door handle 103 is rotated to the unlock position, the upper rod 151 and the lower rod 152 respectively slide downward and upward to the unlock position indicated by the solid line in FIG. As a result, the tips of the upper rod 151 and the lower rod 152 are separated from the flanges 101A and 101B on the ceiling plate side and the bottom plate side of the housing 101, the lock is released, and the door can be freely opened and closed. Since the electrical connection with 101 is cut, the door handle 103 is insulated from the housing 101.
[0021]
As shown in FIG. 3A, a metal handle lever 110 for locking the door is fixedly attached to the front end of the door handle 103 by a lever fixing screw 109 instead of or in addition to the above-described locking rod. As shown in detail in FIG. 3B, the handle lever 110 is made of a plate material that is bent in three steps, and has a mounting hole 110B in the base end portion 110A. The handle lever 110 on the door inner surface side (inside of the housing) is rotated from the vertical position indicated by the dotted line to the horizontal position indicated by the solid line in FIG.
[0022]
As shown in FIG. 3A, when the door 102 is closed and the handle lever 110 is made vertical (dotted line position) by rotating the door handle 103, the bent end portion 110C of the handle lever 110 becomes the side surface of the metal housing. Since the door 102 is locked to the housing 101 and prevented from being opened, and the door handle 103 is electrically connected to the housing 101 via the door lever 110. It will be in a grounded state.
[0023]
Further, when the door handle 103 is rotated to the unlocking position to make the handle lever 110 horizontal (solid line position), the front end portion 110C of the handle lever 110 is separated from the flange 101D of the casing side plate, and the door is unlocked. The door 102 can be freely opened and closed. At this time, the door handle 103 is insulated from the surroundings because the electrical connection with the housing 101 is cut off.
[0024]
As is apparent from the above description of the structure, in the embodiment of the present invention, a series of structures (door handle portion) comprising the door handle 103, the handle lever 110, the upper rod 151, the lower rod 152, and a link mechanism for connecting them. ) Has both functions of a door lock mechanism and a ground opening / closing mechanism, and the insulation state of the door handle 103 is changed by rotating the door handle 103. That is, when the door 102 is locked in the closed position, the door handle 103 is electrically connected to the casing 101 and grounded. However, when the door 102 is unlocked, the door handle 103 is connected to the casing 101. Therefore, when the door 102 is opened, no matter what the object is in contact with the door handle 103, a ground contact is generated. There is no longer to do.
[0025]
Note that a commercially available general-purpose door handle can be used as the door handle, and the door handle may be insulated with an insulating sleeve or the like.
[0026]
【The invention's effect】
As a general feature of the door structure of electrical equipment panels such as switchboards, the door handle protrudes from the door surface, so that when the doors of one or both panels placed side by side open, In this case, the contact is always made through the door handle.
[0027]
However, in the present invention, the door handle serving as the contact point is connected to the grounded housing when the door is closed and locked, and is in a grounded state. Since it is configured to be in an insulated state, no contact with the ground will occur even if the door handle comes into contact with any object when the door is opened.
[0028]
Therefore, according to the present invention, when a plurality of electrical equipment panels having different grounding types are arranged close to each other, the safety of the handle operation with the door closed is ensured, and when the door is opened, Even if the door contacts between the two panels, there is no risk of incompatibility. Therefore, the two boards can be arranged side by side without any gap between them, which brings about an advantage of space saving.
[0029]
Furthermore, the present invention has the advantage that it can be constructed using a commercially available standard door handle.
[Brief description of the drawings]
FIG. 1 is a front view of an electrical equipment panel showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3A is an enlarged cross-sectional view taken along line BB in FIG. 1, and FIG. 3B is a perspective view showing a handle lever used in the present invention.
FIG. 4 is a plan view showing an installation example of a conventional electric equipment panel.
FIG. 5 is a plan view showing a different installation example of a conventional electric equipment panel.
FIG. 6 is a plan view showing still another example of installation of a conventional electric equipment panel.
[Explanation of symbols]
10 electrical equipment panel, 101 housing, 102 door, 103 door handle, 110 handle lever, 151, 161 lock rod.

Claims (3)

  In an electrical equipment panel in which electrical equipment is housed in a grounded metal door enclosure, the door handle for opening and closing the door is electrically insulated from the door and rotated to the locked and unlocked positions. A lock member that is electrically and mechanically connected to the door handle and that is displaced in conjunction with a rotation operation of the door handle; and is formed integrally with the housing; The door is locked and engaged at the door handle lock position to form an electrical connection between the door handle and the chassis, and the door handle is unlocked at the unlock position to lock the door. A lock mechanism comprising a lock member receiving portion for releasing and disconnecting the electrical connection between the door handle and the housing is provided, and the door handle is closed when the door is closed and locked. Placed at the same potential, the electrical equipment board of the door handle device, characterized in that the door handle has to be insulated from the housing in a state of unlocking the door.   2. The door handle device for an electric equipment panel according to claim 1, wherein the lock member includes a metal rod that has one end connected to the door handle and the other end extending to the vicinity of the upper and lower ends of the housing, and moves up and down as the door hand rotates. A door handle device for an electrical equipment panel, wherein the door is supported by the door so as to be vertically displaceable via an insulating material, and the lock member receiving portion is formed by a bent flange portion at the upper and lower ends of the casing.   2. The door handle device for an electric equipment panel according to claim 1, wherein one end of the lock member is electrically and mechanically connected to the door handle and the other end extends to the vicinity of the side end of the housing, and rotates together with the rotation operation of the door handle. A door handle device for an electrical equipment panel, wherein the lock member receiving portion is formed by a bent flange portion at a side end of the housing.

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