JPH05276627A - Round-type wiring instrument - Google Patents

Abstract

PURPOSE:To surely prevent instruments such as a switch and a plug socket from coming off by preventing an inner frame from expanding outwards by an external force and then deflecting and deforming. CONSTITUTION:In a round-type wiring instrument, fitting holes 13 are formed in side pieces 12 which face each other and fitting projections which project from both ends of an instrument located in the inner frame are inserted into the fitting holes 13 and then are fit in with the holes. In order to prevent side pieces of the inner frame 9 from deflecting outwards and then deforming due to a space formed between the inner frame 9 and a plate frame 1, a deflection and deformation preventing projection A is formed on an outer face of the side piece 12 of the inner frame 9 or on an inner face of an opening 2 of the plate frame 1 and the end of the deflection and deformation preventing projection A is caused to abut the face where the projection A is not formed. By this method, the side piece 12 of the inner frame 9 is prevented from expanding and then deflecting and deforming even if an external force is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a round wiring device for arranging devices such as switches and outlets on a construction surface.

[0002]

2. Description of the Related Art Recently, a round wiring device has been proposed because a hole to be bored on a construction surface is changed from a square shape to a round shape, which facilitates the drilling work. In this type of round wiring equipment, a round plate frame having an opening in the center and fixed to the construction surface and a plate frame that is fitted into the opening of the plate frame and is detachably attached to the plate frame. A middle frame, and a switch that is fitted into the middle frame and is detachably attached to the middle frame,
It is configured by a decorative frame or the like that covers the front surface of the plate frame. Further, when the switch 14 is attached to the inner frame 9, as shown in FIG. 11, the engaging holes 13 are provided in the side pieces 12 of the inner frame which face each other, and the switch 14 arranged in the inner frame 9 is projected from both ends. The locking projection 15 is inserted and locked in the locking hole 13.

[0003]

However, in the above conventional example, as shown in FIG. 11, a gap S is formed between the inner surface of the opening 2 of the plate frame 1 and one side piece 12 of the middle frame 9. There is a switch 1 by pushing the handle of the switch 14
4 when a force is applied to the side piece 12,
There is a problem in that the switch 14 is disengaged due to the engagement between the engagement projection 15 and the engagement hole 13 being disengaged as a result of bending deformation so as to spread outward as shown in FIG.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent a middle frame from being flexibly deformed so as to spread outward by an external force, and to thereby provide a switch or an outlet. It is an object of the present invention to provide a round wiring device capable of reliably preventing the device and the like from coming off.

[0005]

In order to achieve the above-mentioned object, the circular wiring apparatus of the present invention comprises a circular plate frame 1 having an opening 2 at substantially the center and fixed to a construction surface, and a plate frame 1 of the plate frame 1. An inner frame 9 that is fitted into the opening 2 and is detachably attached to the plate frame 1, and a device such as a switch 14 and an outlet that is fitted into the inner frame 9 and detachably attached to the inner frame 9 In the round wiring device, the locking holes 13 are provided in the side pieces 12 of the middle frame 9 facing each other, and the locking protrusions 15 projecting from both ends of the device arranged in the middle frame 9 are locked in the hole 1.
3 is inserted and locked, and a gap S between the middle frame 9 and the plate frame 1
The bending deformation preventing projection A for preventing the side piece 12 of the middle frame 9 from bending and deforming outward is provided from one of the outer surface of the side piece 12 of the middle frame 9 and the inner surface of the opening 2 of the plate frame 1. It is characterized in that the tip end of the flexural deformation preventing projection A is brought into contact with the other while protruding.

[0006]

According to the above construction, there is a gap S between the middle frame 9 and the plate frame 1, and when the external force is applied to the device, the middle frame 9
Even when the side piece 12 of the above is subjected to the force of spreading outward, the bending deformation preventing projection A does not flexibly deform so that the middle frame 9 spreads outward, and the device can be prevented from falling off.

[0007]

FIG. 1 is an exploded perspective view showing the whole one embodiment of the present invention. The plate frame 1 arranged on the front surface of the construction surface is formed in a round shape as shown in FIG. 3, and an opening 2 is formed at the substantially center thereof. Legs 3 having a U-shaped cross section are integrally projected on both sides of the back surface of the plate frame 1, and the legs 3 are inserted into circular holes formed on the construction surface.

A screw 5 having a screw 4 made of synthetic resin attached to the base thereof is inserted into the through hole 6 of the plate frame 1 and the leg 3, and the tip of the screw 5 is attached to the sandwich metal fitting 7 arranged at the lower end of the leg 3. It is screwed. And by tightening the screw 5,
The plate frame 1 is attached to the building material by sandwiching the building material with the periphery of the back surface of the plate frame 1 and the sandwiching metal member 7 which is rotated so as to project outward. Further, on both sides of the plate frame 1, screw holes 8 for directly screwing the building frame are drilled.

As shown in FIG. 4, locking claws 10 are provided at the four corners of the middle frame 9 which is detachably mounted in the opening 2 of the plate frame 1.
Are integrally formed with each other, a locking recess 11 is formed inside the opening 2 of the plate frame 1, the middle frame 9 is arranged in the opening 2 of the plate frame 1, and the locking claw 10 is engaged. The middle frame 9 is detachably attached to the plate frame 1 by being inserted and locked in the recess 11.

A switch 14 is disposed in the middle frame 4, and a pair of locking protrusions 15 projecting from both sides of the switch 14 are inserted and locked in the locking holes 13 of the middle frame 4. The switch 14 is detachably attached to the middle frame 9. The middle frame 9 has a size such that two switches 14 can be mounted, but in the present embodiment, one switch 14 is mounted. In this case, the locking projections 15 of the switch 14 are locked in the two locking holes 13 inside the middle frame 9.

The middle frame 9 is used for a switch 14 such as a piano-operated push button switch.
Two sets of locking holes 13 are provided on both sides, and a switch 14
Two can be attached. Switch 14 to 2
Since the middle frame 9 is shared between the case where one piece is attached and the case where one piece is attached, the inner locking hole 13 is formed longer than the outer one for pitch adjustment.

A bending deformation preventing projection A is provided so as to protrude from the outer surface of the one side piece 12 of the middle frame 9 at the center in the longitudinal direction.
When the middle frame 9 is fitted into the opening 2 of the plate frame 1 as shown in FIG.
Touches the inner surface of the plate frame 1. As a result, even when the handle 22 of the switch 14 is pushed to apply an external force, and the side piece 12 receives a force as shown by an arrow in FIG. It can be prevented. As a result, the inner frame 9 expands and the locking hole 13
The locking projection 15 does not come off and the switch 14 does not come off. That is, even if there is a gap between the side piece 12 of the middle frame 9 and the inner surface of the plate frame 1, the middle frame 9 can be prevented from being flexed and deformed by being stretched by the flexure deformation prevention protrusion A.

In the present embodiment, the bending deformation preventing protrusion A is provided on the side piece 12 of the middle frame 9, but the bending deformation preventing protrusion A is provided on the plate frame 1 side so that the bending deformation preventing protrusion A is Even if the tip is brought into contact with the outer surface of the middle frame 9, the same effect can be obtained. A metal fireproof panel 16 as shown in FIG. 5 is mounted on the front surface of the plate frame 1, and a hole 17 for exposing the switch 14 is formed in the center thereof.
Further, a circular hole 18 for escaping the screw 5 and a semi-circular hole 19 for escaping the screw screwed into the screw hole 8 are formed around the fireproof plate 16. Claws 21 that are inserted and locked in the holes 20 of the plate frame 1 are formed at four locations on the periphery of the fireproof panel 16.

An operating handle 22 detachably attached to the upper surface of the switch 14 is formed in a disk shape, and an operating mark 23 for pushing with a fingertip is formed at one end of the handle 22. A display window 24 is formed on the other end side of the handle 22. A display unit 25 for lit display is provided on the upper surface of the switch 14, and a lens 26 that collects the light of this display and transmits it to the display window 24 is provided on the handle 2.
2 is attached to the lower surface.

A decorative frame 28 having an opening 27 slightly larger than the handle 22 is formed in the shape of a round frame. As shown in FIG. 7, locking claws 29 are integrally formed on the back surface. ing. The locking claw 29 is inserted and locked in a locking recess 30 formed in the plate frame 1 so that the decorative frame 28 can be detachably mounted. In addition, the makeup frame 28
7, which shows the back surface of the decorative frame 28, a rib 31 for guiding when fitting the plate frame 1 is formed around the back surface of the decorative frame 28, and a rib for hiding the inside along the opening 27. 32
Are integrally formed.

For assembly, the switch 14 can be fixed to the plate frame 1 by the procedure of mounting the switch 14 on the middle frame 9 and then mounting the middle frame 9 on the plate frame 1. By the way, the switch 14 has a structure as shown in FIG. That is, the push button 33 that is pushed by the handle 22 and is movable in the vertical direction, the spring 34 that biases the push button 33 upward, and the push button 33 that is biased by the spring 34.
The slider 35 is mounted on the lower surface of the slider so as to be movable in the lateral direction, and the reversing handle 36 and the like which is reversed by the downward movement of the slider 35.

When the slider 35 moves downward, the engaging protrusion 37 of the reversing handle 36 is urged to rotate the reversing handle 36, and the rotation of the reversing handle 36 causes the engaging protrusion 37 to engage the slider 35. The joint portion is pushed to move the slider 35 laterally. When the reversing handle 36 rotates and reverses, the coil spring 3
The open / close plate 40 connected at 9 is inverted to switch the contacts.

Next, the mounting structure and operation of the handle 22 will be described. 8 to 10, the handle 22
Fulcrum rib 4 having elasticity at the time of operation of the instrument on one end side of the lower surface of the
A pair of stopper ribs 42 is provided vertically on the other end side, and a pair of stopper ribs 42 having elasticity at the time of operation return are vertically provided. A rib 43 serving as a stopper at the time of operation is formed on the outside of the stopper rib 42, and an action point rib 44 for pressing the protrusion 45 of the push button 33 of the switch 14 is integrally projected at the center of the lower surface of the handle 22. It is set up.

The handle 2 is attached to one end of the upper surface of the switch 14.
A recess 46 into which the second fulcrum rib 41 is inserted and supported is formed, and a recess 47 into which the stopper rib 42 is inserted is formed on the other end side. Here, in the handle 22, the edge 42a of the stopper rib 42 is locked to the inner corner,
The handle 22 is prevented from coming off. When the operation mark 23 of the handle 22 is pushed with a fingertip, as shown in FIGS. 8 and 10, the fulcrum rib 41 is rotated as a fulcrum, and the action point rib 44 presses the protrusion 45 of the push button 33 of the switch 14. hand,
The switch 14 is opened and closed as described above. When the pushing operation of the handle 22 is stopped, the handle 22 returns and the contact holds the state. When the handle 22 is pushed again, the push button 33 is pressed and the contacts are reversed and returned.

Further, as shown in FIG. 5, the fire-resistant panel 16 is formed by bending the claws 21 at four locations on the outer peripheral portion of the fire-resistant panel 16, and the outer surface of the claw 21 is formed by cutting and raising the crook 54. Is forming. Therefore, when the fireproof panel 16 is mounted on the front surface of the plate frame 1 and the claw 21 is inserted into the hole 20, the claw portion 5
4 is locked to the inner surface of the hole 20, so that the fireproof panel 16
Can be securely fixed to the plate frame 1.

Further, on the outer peripheral portion of the fireproof panel 16, square holes 51 are formed at four locations for the purpose of releasing the locking claws 29 of the decorative frame 28. Therefore, the decorative frame 28 is attached to the plate frame 1 without disturbing the fireproof panel 16.
Can be fixed to. Further, as described above, a square hole 17 is formed in the center of the fireproof panel so that the front surface of the switch 14 is exposed from the hole 17 to facilitate the operation. Further, the shape of the hole 17 can be processed according to the shape of the instrument used.

Further, the size of the hole 18 through which the screw 5 is inserted is larger than the head of the screw 5, so that the fireproof panel 16 alone may fall off. Therefore, the protrusions 52 are provided so as to project inward from both sides of the inner edge of the hole 18. Convex portion 52
Since the dimension between them is smaller than the head of the screw 5, the head of the screw 5 is caught by the convex portion 52, so that the refractory panel 16 alone can be prevented from falling off.

On the other hand, when the plate frame 1 is directly attached to the construction surface, the same convex portion 53 as the above is formed in the hole 19 of the fireproof panel 16 through which the screw is inserted. Also in this case, the fireproof panel 16 alone can be prevented from falling off. Further, a tongue-shaped convex portion 53 is formed in the hole 19 of the fireproof panel 16, and when the plate frame 1 is directly attached to the construction surface with a screw, the convex portion 53 receives the head of the screw and the fireproof panel. The plate frame 1 together with 16 can be attached to the construction surface. Therefore, even if a synthetic resin molded part such as the decorative frame 28 burns in the event of a fire, the fireproof panel 16 is fixed to the construction surface with screws, so the equipment mounting holes on the construction surface are not exposed. , It is possible to prevent the spread of flame.

In the above embodiment, the switch 1 is used as an instrument.
4 has been described, but the same structure can be applied when an outlet is attached as a device.

[0025]

As described above, according to the present invention, the bending deformation preventing projections for preventing the side pieces of the middle frame from bending and deforming outward due to the gap between the middle frame and the plate frame are provided on the side of the middle frame. Since the projection is provided from one of the outer surface of the piece or the inner surface of the opening of the plate frame and the tip of the bending deformation preventing projection is in contact with the other, there is a gap between the middle frame and the plate frame, and the device Even if the side pieces of the middle frame receive a force that expands outward when an external force is applied, the bending protrusions prevent the middle frame from flexing and deforming to expand outward, and the locking protrusions of the device It is possible to prevent the device from falling out by preventing the device from coming off from the locking hole.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an entire embodiment of the present invention.

FIG. 2 is a partially cutaway plan view showing an essential part of the above.

FIG. 3 is an enlarged perspective view of the plate frame and the sandwich metal fitting of the same.

FIG. 4 is an enlarged perspective view of the middle frame and the switch of the same.

FIG. 5 is an enlarged perspective view of the above fireproof panel and screws.

FIG. 6 is an enlarged perspective view of the same decorative frame and handle.

FIG. 7 is a rear view of the same decorative frame.

FIG. 8 is a sectional view of the above switch.

FIG. 9 is a sectional view of the above handle.

FIG. 10 is a cross-sectional view of an entire assembled state of the above.

FIG. 11 is a partially cutaway plan view illustrating a conventional example.

[Explanation of symbols]

 1 Plate Frame 2 Opening 9 Middle Frame 12 Side Piece 13 Locking Hole 14 Switch 15 Locking Protrusion A Flexure Deformation Preventing Protrusion S Gap

Claims (1)

[Claims] 1. A round plate frame having an opening at substantially the center and fixed to a construction surface, a middle frame fitted in the opening of the plate frame and detachably attached to the plate frame, and a middle frame. In a round wiring device equipped with devices such as switches and outlets that are fitted inside and detachably attached to the middle frame,
A locking hole is provided in each of the opposite side pieces of the middle frame, and locking projections projecting from both ends of the device arranged in the middle frame are inserted and locked into the locking holes, so that the middle frame and the plate frame A bending deformation preventing projection for preventing the side piece of the middle frame from bending and deforming outward due to the gap is provided from one of the outer surface of the side piece of the middle frame and the inner surface of the opening of the plate frame. A round wiring device, characterized in that a tip of a bending deformation preventing protrusion is in contact with the other end.