JP3932438B2 - Wiring box - Google Patents

Description

  The present invention relates to a wiring box that accommodates wiring devices such as switches and outlets, and to which corrugated conduits that protect the wires connected to these wiring devices are connected, and in particular, without using a connector. The present invention relates to a wiring box to which a corrugated conduit is connected.

  Conventionally, as shown in FIG. 11, a wiring box 1 concealed or embedded in a wall is provided with a punching portion 21 that can be punched on a side wall or a bottom wall thereof. In order to connect a conduit to the wiring box 1, the punched portion 21 is punched to form a circular through hole, a connector 22 is attached to the circular through hole, and a conduit is connected to the receptacle of the connector 22. Like to do. In addition, as a conduit tube, in order to provide flexibility according to the attachment place, the corrugated conduit tube which formed the outer surface in the waveform of an unevenness | corrugation is used normally.

For example, Patent Document 1, Patent Document 2, and Patent Document 3 disclose the connection of a corrugated conduit to a wiring box.
Japanese Utility Model Publication No. 58-31718 Japanese Utility Model Publication No. 60-190115 Japanese Utility Model Publication 1-186110

However, the work of attaching the connector 22 to the wiring box 1 is troublesome. Moreover, it is very uneconomical to require the connector 22 every time the corrugated conduit is connected. Furthermore, since the connector 22 protrudes from the outer wall of the wiring box 1, it may be difficult to attach in a narrow space.

  Then, this invention makes it a subject to provide the wiring box which can connect a corrugated conduit tube easily and cheaply, without using a connector.

The wiring box according to the invention of claim 1 includes, on the side wall or the bottom wall, a pipe connecting portion capable of forming a pipe insertion hole through which the corrugated conduit is inserted into a circle corresponding to the outer diameter of the corrugated conduit. ,
The tube connecting portion includes a tube locking claw projecting inwardly from a part of a peripheral portion of the tube insertion hole without protruding from an outer wall, and a punching portion that closes the tube insertion hole so as to be punched. Formed with
The punched portion is connected to a peripheral portion of the tube insertion hole other than a portion where the tube locking claw is formed by a connecting portion,
By punching out the punched portion, a tube insertion hole is formed and the tube locking claw remains on the peripheral edge of the tube insertion hole,
By inserting the corrugated conduit into the tube insertion hole, the tube locking claw can be fitted into the recess of the outer surface of the corrugated conduit and connected to the corrugated conduit. is there.

  The wiring box according to the present invention includes a pipe connection portion on a side wall or a bottom wall that can form a tube insertion hole through which a corrugated conduit tube is inserted, and the pipe connection portion extends inwardly from a peripheral portion of the tube insertion hole. And a punching portion that closes the tube insertion hole so as to be punched out. Therefore, after punching out the punching part of the wiring box, the corrugated conduit can be connected to the retaining state simply by pushing it into the tube insertion hole of the wiring box. As a result, since a connector can be dispensed with, a corrugated conduit can be connected easily and inexpensively. Further, since the pipe connecting portion does not protrude from the outer wall of the wiring box unlike the connector, it can be attached even in a narrow space.

  Embodiments of the present invention will be described below with reference to FIGS.

  In the figure, a wiring box 1 is formed in a box-like body having one side opened by a side wall 2 and a bottom wall 3 with synthetic resin or the like, and a wiring device (not shown) is accommodated therein. A plurality of plate-like pipe connecting portions 4 are formed on the side wall 2. The tube connecting portion 4 has a circular outer periphery, and is formed of a punchable punching portion 5 and a pair of tube locking claws 6 protruding inwardly from upper and lower peripheral edges. Moreover, the diameter of the outer periphery of the said pipe connection part 4 is formed slightly larger than the outer diameter b of the convex part 12 of the outer surface of the corrugated conduit 11 attached in order to protect the electric wire connected with the wiring apparatus. . Here, the corrugated conduit 11 is made of synthetic resin or the like. The punching part 5 is punched from the side wall 2 by cutting the connecting part 8 provided integrally with the gap 7 with the tube locking claw 6 by punching. After the punching part 5 is punched, a tube insertion hole 9 through which the corrugated conduit 11 is inserted is formed.

  Further, the pair of upper and lower tube locking claws 6 are formed such that the distance a between the tips thereof is smaller than the outer diameter b of the convex portion 12 of the corrugated conduit tube 11 and the width c of the concave portion 13 of the corrugated conduit tube 11. When formed into a thinner wall thickness and inserted through the tube insertion hole 9, it is inserted into the recess 13 on the outer surface of the corrugated conduit 11. Further, the projecting end portion is formed in a tapered surface that is inclined in the direction of narrowing the tube insertion hole 9 toward the insertion direction of the corrugated conduit tube 11. The back surface side of the tube locking claw 6 is formed as a vertical surface.

  Next, connection of the corrugated conduit to the wiring box configured as described above will be described.

  In order to connect the corrugated conduit 11 to the wiring box 1, first, the punching part 5 constituting a part of the pipe connection part 4 of the wiring box 1 is punched. Then, it cut | disconnects in the connection part 8, the said punching part 5 is removed, and the pipe penetration hole 9 is formed later. In addition, the tube locking claw 6 remains in a state of being protruded from the peripheral edge portion of the tube connection portion 4.

  Next, if the corrugated conduit 11 is forcibly pushed into the tube insertion hole 9, the convex portion 12 at the tip of the corrugated conduit 11 is pressed by the tube locking claw 6 of the tube connecting portion 4 and is elastic. The tube is inserted into the tube insertion hole 9 while being deformed. At this time, since the tip end portion of the tube locking claw 6 is formed in a tapered surface, it can be inserted easily. After the distal end portion of the corrugated conduit 11 is inserted into the tube insertion hole 9 of the wiring box 1, the pair of upper and lower pipe locking claws 6 in the tube insertion hole 9 are in the recess 13 of the corrugated conduit 11. The convex portion 12 at the tip of the corrugated conduit 11 is inserted and kept in contact with the vertical surface of the tube locking claw 6 whose side surface facing the tube locking claw 6 is also the inner surface of the side wall 2. Locked to the state. As described above, the connection to the wiring box 1 is completed by forcibly pushing the corrugated conduit 11.

  As described above, the wiring box of the above embodiment includes the pipe connecting portion 4 on the side wall 2 capable of forming the pipe insertion hole 9 through which the corrugated conduit 11 is inserted, and the pipe connecting portion 4 is connected to the pipe insertion passage. It is formed by a tube locking claw 6 projecting inwardly at the peripheral edge of the hole 9 and a punched portion 5 that closes the tube insertion hole 9 so as to be punched.

  Therefore, after punching the punching part 5 of the wiring box 1, the corrugated conduit 11 can be connected to the retaining state simply by pushing into the tube insertion hole 9 of the wiring box 1. It can be easily connected without using a troublesome connector. In addition, since no connector is required, connection work can be performed at low cost. Furthermore, since the pipe connecting portion 4 does not protrude from the outer wall of the wiring box 1 like a connector, it can be attached even in a narrow space.

  Further, since the protruding end of the tube locking claw 6 is formed in a tapered surface inclined in the direction of narrowing the tube insertion hole 9 toward the insertion direction of the corrugated conduit tube 11, the insertion of the corrugated conduit tube 11 is performed. Is easy, and once inserted, the corrugated conduit 11 can be reliably prevented from being detached.

  By the way, as shown in FIG.4 and FIG.5, the pipe connection part 4 of the wiring box 1 in the said Example is connected to the connection part 8 which connected the punching part 5 integrally, and a pair of upper and lower pipe latching claws. 6 may be provided.

  Alternatively, the pipe connecting portion 4 of the wiring box 1 may be one in which the connecting portion 8 is stretched thinly around the entire circumference of the punched portion 5.

  Further, the pipe locking claws 6 of the pipe connecting portion 4 of the wiring box 1 are not limited to those provided in the upper and lower two, for example, those provided in three as shown in FIGS. It is good also as what provided the above number.

  Further, the tube locking claw 6 of the wiring box 1 is thin or formed of a flexible material, or is elastically deformed as a comb-like shape having a plurality of cuts in the vertical direction. Also good.

  Further, the tube locking claw 6 may be elastically deformed by forming a notch in the side wall 2 at the peripheral edge of the tube insertion hole 9, which is shown in FIGS. 8 to 10.

  In the drawing, the tube locking claw 6 has a notch 6a formed on the side wall 2 at the peripheral edge of the tube insertion hole 9 on both sides thereof. For this reason, the tube locking claw 6 is elastically bent and deformed in the insertion direction, that is, inward of the wiring box 1 due to the pressing at the time of insertion of the tip of the corrugated conduit tube 11. And when the convex part 12 of the front-end | tip part of the corrugated conduit 11 is penetrated in the pipe penetration hole 9 of the box 1 for wiring, the pipe latching claw 6 will return elastically, and the corrugated conduit 11 It fits into the recess 13. With this configuration, the corrugated conduit 11 can be more easily inserted into the tube insertion hole 9.

  Here, as shown in FIG. 10, if the distance d between the tip ends of the pair of upper and lower pipe locking claws 6 in FIG. 8 is smaller than the outer diameter e of the concave portion 13 of the corrugated conduit 11, When the corrugated conduit 11 is inserted into the tube insertion hole 9, the distal end portion of the tube locking claw 6 is pressed against the concave portion 13 on the outer surface of the corrugated conduit 11, and further return is prevented. It is held as it is. As a result, this pressure contact force can prevent the corrugated conduit 11 from being pulled out after insertion with a simple structure.

  In each of the above embodiments, the pipe connecting portion 4 is provided on the side wall 2 of the wiring box 1, but it goes without saying that the pipe connecting portion 4 can be similarly applied to the one provided on the bottom wall 3.

  Note that the pipe to be connected is not a corrugated conduit but a smooth outer conduit, and when the conduit is inserted into the tube insertion hole 9, the tip of the tube locking claw 6 bites into the outer surface of the conduit. It is good also as what keeps connecting and connecting.

It is a side view which shows the box for wiring of the Example of this invention. It is principal part sectional drawing by the AA cutting line of FIG. It is principal part sectional drawing which shows the state which connected the corrugated conduit tube to the box for wiring of FIG. It is a principal part side view which shows the box for wiring of another Example of this invention. It is principal part sectional drawing by the BB cutting line of FIG. It is a principal part side view which shows the box for wiring of another Example of this invention. It is principal part sectional drawing by the CC cutting line of FIG. It is a principal part side view which shows the box for wiring of another Example of this invention. It is principal part sectional drawing which shows a state when connecting a corrugated conduit to the box for wiring of FIG. It is principal part sectional drawing which shows the modification of the box for wiring of FIG. It is a perspective view which shows the conventional box for wiring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box for wiring 2 Side wall 3 Bottom wall 4 Pipe connection part 5 Punching part 6 Pipe latching claw 6a Notch 9 Pipe insertion hole 11 Corrugated conduit 12 Protrusion part 13 Concave part

Claims (1)

A side wall or a bottom wall is provided with a pipe connecting portion capable of forming a pipe insertion hole through which a corrugated electric pipe is inserted into a circle corresponding to the outer diameter of the corrugated electric pipe,
The tube connecting portion includes a tube locking claw projecting inwardly from a part of a peripheral portion of the tube insertion hole without protruding from an outer wall, and a punching portion that closes the tube insertion hole so as to be punched. Formed with
The punched portion is connected to a peripheral portion of the tube insertion hole other than a portion where the tube locking claw is formed by a connecting portion,
By punching out the punched portion, a tube insertion hole is formed and the tube locking claw remains on the peripheral edge of the tube insertion hole,
By inserting the corrugated conduit into the tube insertion hole, the tube locking claw can be inserted into the concave portion of the outer surface of the corrugated conduit and connected to the corrugated conduit. box.

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