JP2010224965A - Wiring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring instrument which can be thinned as a base and a cover can be securely attached thereto. <P>SOLUTION: The wiring instrument includes a base 21 and a cover. A battery 16 that protrudes toward the base 21 is mounted in the cover and a plurality of mounting pieces are provided on a circumference closer to an outside diameter than the battery 16. A regulating section 59 for regulating the base 21 and the cover from fitting each other, while permitting the base and the cover to slide circumferentially while in contact, is provided on the base 21 at a position where the mounting piece makes contact so that the head 49a of a screw 49 of the base 21 does not interfere with the battery 16 in the cover. A plurality of grooved sections 60 that allow the mounting pieces to enter therein to permit the base 21 and the cover to fit each other are provided in the regulating section 59 at a position where the head 49a of the screw 49 of the base 21 does not interfere with the battery 16 in the cover. An engagement section 61 where the mounting pieces entering the grooved sections 60 engage is provided on one circumferential side of each grooved section 60. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wiring device including a base installed with screws on a portion to be installed and a cover fitted and attached to the base.

  2. Description of the Related Art Conventionally, for example, a wiring appliance such as a residential fire alarm has a case composed of a base and a cover that is detachably attached to the base, and electrical equipment such as a sensor body is housed in the cover of the case. ing.

  When such a wiring device is installed on a ceiling surface or the like, the base is fixed to the ceiling surface with screws and a cover is attached to the base.

  As a mounting structure between the base and the cover, a plurality of mounting pieces project from the inner surface of the peripheral surface portion of the base, and a groove portion into which the mounting piece enters is provided at the edge of the cover that fits inside the peripheral portion of the base. In addition, there is an attachment structure in which an engagement portion to which an attachment piece is engaged and attached is provided on one circumferential side of the groove portion. In this mounting structure, these are fitted so that the mounting piece of the base and the groove portion of the cover coincide with each other, and the cover is rotated while the mounting piece enters the groove portion and the base and the cover are fitted. The attachment piece is engaged with the engagement portion for attachment (see, for example, Patent Document 1).

JP-A-6-333181 (page 4-5, FIG. 4)

  By the way, when trying to reduce the thickness of such a wiring device, it is necessary to have a layout in which the electrical components housed in the cover are brought close to the inner surface of the base in a state where the base and the cover are combined.

  However, since the head of the screw for attaching the base to the ceiling surface protrudes on the inner surface of the base, in the mounting structure in which the cover is rotated with respect to the base, the electrical parts protruding from the cover side are There is a problem that it is difficult to attach a cover to the base because it interferes with the head of the screw of the base, and the wiring device cannot be sufficiently thinned.

  This invention is made | formed in view of such a point, and it aims at providing the wiring appliance which can be reduced in thickness.

  The wiring device according to claim 1, wherein the wiring device is fitted to the base in a centered position by means of a screw that passes through a circumferential position off the center; A cover having a protruding portion projecting toward the base on a part of the circumference; a plurality of attachment pieces provided on the outer circumference side of either the base or the cover; On the other side of the base and cover, the base and cover are fitted at a height where the mounting piece abuts on the circumference corresponding to the position of the mounting piece and the base screw and cover protrusion do not interfere with each other. The mounting part enters and the base and the cover are allowed to fit in a position where the base part and the protruding part of the cover do not interfere with the restriction part that restricts and allows sliding in the circumferential direction in the contact state. Multiple grooves and one circumferential side of each groove Those that include a; provided entered the groove mounting piece and a plurality of engagement portions is mounted engaged with the mounting guide provided.

  Wiring equipment includes, for example, residential fire alarms, but is not limited thereto. Examples of the installation part for installing the wiring device include a ceiling surface and a wall surface.

  For example, the base and the cover may each be disk-shaped, and may be provided with fitting portions that are fitted to each other on the peripheral wall portions. The protrusion of the cover includes, for example, a battery included in the wiring device, an electrical component such as a terminal block, a part of the cover, and the like.

  The fitting portion of the mounting piece and the mounting guide may have any configuration, for example, provided in a substantially L shape so as to be hooked and engaged with each other, and is provided in at least two places on the circumference of the base and the cover. However, it may be provided at three or more locations. When the fitting part which mutually fits in the surrounding wall part of a base and a cover is provided, you may enable it to position the center position of a base and a cover by an attachment piece contacting the fitting part.

  The wiring device according to claim 2 is the wiring device according to claim 1, wherein the mounting guide is provided with an inclined surface that is continuous with the regulating portion and the bottom surface of the groove portion on the other circumferential side of the groove portion.

  According to the wiring device of claim 1, when fitting the cover to the base and attaching it, if the attachment piece tries to fit at a position where the attachment piece comes into contact with the restriction portion of the attachment guide, the attachment piece and the restriction portion In order to regulate the fitting between the base and the cover at a height position where the base screw and the projecting part of the cover do not interfere with each other by the contact, the mounting piece is rotated to the position where it enters the groove part in the contact state. In addition, the position where the mounting piece enters the groove is a position where the base screw and the protrusion of the cover do not interfere with each other. The mounting piece can be attached by engaging with the engaging portion on one side in the circumferential direction of the groove portion. Therefore, the base and the cover can be securely attached even when the protruding portion of the cover is attached close to the base. And wiring Ingredients can and slim.

  According to the wiring device according to claim 2, in addition to the effect of the wiring device according to claim 1, since the inclined surface that is continuous to the bottom surface of the restricting portion and the groove portion is provided, the mounting piece that comes into contact with the restricting portion is provided. It is possible to enter the groove portion through the inclined surface and engage with the engaging portion as it is, and to attach the cover to the base securely without being mistaken for the attachment piece that has just entered the groove portion.

It is a front view of the base of the wiring apparatus which shows one embodiment of this invention. It is a front view of the cover of a wiring device same as the above. It is sectional drawing of the state before the fitting of the base and cover of a wiring device same as the above. It is sectional drawing of the fitting state of the base and cover of a wiring device same as the above. It is a perspective view of the attachment piece and attachment guide of a wiring instrument same as the above. Fig. 4 shows the mounting piece and the mounting guide of the wiring device, wherein (a) is a cross-sectional view of the mounting piece and the engaging portion of the mounting guide before engagement, and (b) is the mounting piece and the engaging portion of the mounting guide. It is sectional drawing of an engagement state.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 4, the wiring device 11 is, for example, a residential fire alarm device, and includes a disk-shaped case 12 and an alarm device body 13 as a wiring device body disposed in the case 12. ing.

  The alarm device body 13 is a battery type that operates by using a cylindrical battery 16 such as a lithium ion battery as an electrical component as a power source, for example, a sensor such as a smoke sensor or a heat ray sensor, a speaker that emits an alarm, etc. Alarm sound generator, alarm stop switch, etc. are mounted on the substrate 17.

  In addition, the case 12 includes a base 21 that is installed on an installation part such as a ceiling surface or a wall surface, and a cover 22 that is attached to the base 21 so as to be detachable and attachable to the base 21. 13 is stored.

  The cover 22 includes a cover main body 25 that is open on the back surface side that is the base mounting surface side, and an intermediate bottom body 26 that is mounted in the opening on the back surface side of the cover main body 25.

  The cover body 25 is formed in a disc shape from an insulating synthetic resin material, and includes a front cover portion 27 and a peripheral wall portion 28 provided in the peripheral portion of the cover portion 27. A projection 30 having a plurality of smoke detection holes 29 is formed in the center of the cover 27, and a plurality of slits 31 for passing an alarm sound are formed in the periphery of the cover 27 and the alarm is stopped. An operation button 32 is arranged. The operation button 32 is arranged so as to be positioned on the lower side when viewed from the front of the cover 22 when the wall surface is installed. Further, the peripheral wall portion 28 is formed with a cover side fitting portion 33 that is fitted to the base 21. The cover side fitting portion 33 has a fitting edge 34 protruding from the outer peripheral portion of the peripheral wall portion 28 and a fitting groove 35 formed in the inner peripheral portion of the fitting edge 34.

  The insole 26 has an insole 36 attached to the back side of the cover main body 25 from the position of the cover side fitting part 33, and a battery holding part 37 for holding the battery 16 in the insole 36. Is formed. The battery holding part 37 has an opening on the back side of the middle bottom part 36, and has a holding piece 38 that allows the battery 16 to be attached and detached and holds the battery 16 in the attached state. The battery 16 held by the battery holding part 37 is arranged so that the axial direction of the battery 16 is positioned horizontally on the upper side when viewed from the front of the cover 22 when the wall surface is installed.

  Attaching pieces 39 projecting from the cover-side fitting portion 33 protrude from the back side of the cover body 25 at a plurality of locations around the middle bottom portion 36 and at equal intervals in the circumferential direction. . As shown in FIGS. 5 and 6 (a) and 6 (b), these attachment pieces 39 are formed along the outer bottom piece 40 protruding from the middle bottom portion 36 along the peripheral portion of the middle bottom portion 36, and along the radial direction of the middle bottom portion 36. The support piece 41 protrudes from the middle bottom 36, and the attachment piece 42 is provided at the tip of the pieces 40, 41 so as to face the back side of the middle bottom 36. The support piece 41 is provided on the opposite side of the outer turn piece 40 with respect to the mounting turning direction (clockwise direction when viewed from the front of the cover 22). Yes.

  As shown in FIGS. 3 and 4, from the back surface of the cover 22, the battery 16 held by the battery holding portion 37 is projected together with the plurality of attachment pieces 39, and the battery 16 is viewed from the front of the cover 22. The center part of both ends is a protrusion 43 on the cover 22 side that protrudes from the back surface of the cover 22 to the outermost side. In FIG. 1, the rotation trajectory of the center portion of the battery 16, that is, the protrusion 43 on the cover 22 side with respect to the base 21 is indicated by a one-dot chain line. Each attachment piece 39 is located on the outer diameter side of the rotation locus of the protrusion 43 on the cover 22 side.

  As shown in FIG. 1, the base 21 is formed in a disk shape from an insulating synthetic resin material, and is a flat disk-shaped base plate 46 and a peripheral wall portion provided in the peripheral portion of the base plate 46. 47.

  The base plate 46 is formed with a knockout 48 that is removed when the AC power line is connected to the alarm device body 13 at the center, and a screw shaft portion of a screw 49 attached to the installation portion on the circumference in the vicinity of the peripheral portion. A plurality of mounting holes 50 through which are inserted. These mounting holes 50 are respectively arranged at four positions that are equidistant in the circumferential direction at the top, bottom, left, and right positions when viewed from the front of the base 21 when the wall surface is installed, and the left and right mounting holes 50 are for ceiling surface mounting and upper and lower mounting holes. 50 is used for wall mounting. The upper mounting hole 50 is formed in the harpoon hole 51 so as to be hooked and attached to a screw 49 screwed into the wall surface in a temporarily fixed state. The positions of the mounting holes 50 and the heads 49a of the screws 49 that pass through the mounting holes 50 are at positions that interfere with the rotation locus of the protrusions 43 on the cover 22 side, as shown by the one-dot chain line in FIG. .

  A base side fitting portion 53 that fits with the cover side fitting portion 33 of the cover 22 is formed on the peripheral wall portion 47. The base-side fitting portion 53 has a fitting edge 54 protruding from the inner peripheral portion of the peripheral wall portion 47 and a fitting groove 55 formed in the outer peripheral portion of the fitting edge 54.

  An attachment guide 57 for attaching the cover 22 is formed on the inner peripheral portion of the peripheral wall portion 47. As shown in FIGS. 1, 3 to 5, the mounting guide 57 includes a positioning guide portion 58 constituted by an inner peripheral surface of a peripheral wall portion 47 with which the outer peripheral portion of each mounting piece 39 of the cover 22 is engaged. At a height position where the tip of each mounting piece 39 of the cover 22 engaged with the inside of the positioning guide 58 abuts and the head 49a of the screw 49 on the base 21 side does not interfere with the protrusion 43 on the cover 22 side. Restricting portions 59 that restrict fitting between the base-side fitting portion 53 and the cover-side fitting portion 33 and allow sliding in the circumferential direction in the contact state are formed along the circumferential direction.

  In the restricting portion 59, each mounting piece 39 enters at a position where the head 49a of the screw 49 of the base 21 and the protrusion 43 on the cover 22 side do not interfere with each other, and the base side fitting portion 53 and the cover side fitting portion 33 are provided. A plurality of grooves 60 that allow fitting are formed. The groove portions 60 are positioned at four locations that are equally spaced in the circumferential direction, corresponding to the positions of the mounting pieces 39 of the cover 22, between the mounting holes 50 adjacent in the circumferential direction.

  An engagement portion 61 is formed on one side in the circumferential direction of each groove portion 60 corresponding to the mounting rotation direction of the cover 22 to which each attachment piece 39 that has entered the groove portion 60 is engaged and attached. On the other side in the direction, an inclined surface 62 that is continuous with the regulating portion 59 and the bottom surface of each groove portion 60, that is, the back surface of the base plate 46 is formed.

  The engaging portion 61 protrudes from the base plate 46, and an engaging groove portion 63 into which the outer piece 40 of the mounting piece 39 enters is formed between the inner wall surface of the peripheral wall portion 47 and the base plate 46. An engagement groove portion 64 into which the attachment piece portion 42 of the attachment piece 39 enters is formed.

  A small-diameter hole portion of the daruma hole 51 is located at the position of the restricting portion 59, and a notch portion 65 is formed so as not to interfere with the head 49a of the screw 49 that passes through the small-diameter hole portion of the daruma hole 51. The circumferential width b of the mounting piece 39 of the cover 22 is wider than the circumferential width a of the notch 65.

  Then, when installing the wiring appliance 11 configured in this way on the ceiling surface, screws 49 are screwed to the ceiling surface through the ceiling mounting holes 50 of the base 21, and the base 21 is attached to the ceiling surface. Install.

  The mounting pieces 39 of the cover 22 are engaged with the inside of the peripheral wall portion 47 of the base 21, that is, the inside of the positioning guide portion 58 so that the cover 22 is fitted to the base 21. Thereby, the center of the cover 22 and the center of the base 21 are positioned so as to coincide with each other. When the wiring device 11 is installed on the ceiling surface, the cover 22 may be fitted to the base 21 in any direction.

  As shown in FIGS. 3 and 6 (a), when the cover 22 is to be fitted to the base 21, it is attempted to be fitted at a position where each mounting piece 39 of the cover 22 abuts against the restricting portion 59 of the base 21. For example, the contact between the mounting pieces 39 and the restricting portion 59 prevents the cover 22 from fitting into the base 21 at a height where the battery 16 of the cover 22 does not interfere with the head 49a of the screw 49 of the base 21. regulate.

  The attachment pieces 39 enter the groove portions 60 through the inclined surfaces 62 by rotating the cover 22 in the attachment rotation direction while the attachment pieces 39 and the restricting portions 59 are in contact with each other. At this time, the notch 65 is provided in a part of the restricting part 59, but the circumferential width b of the mounting piece 39 of the cover 22 is wider than the circumferential width a of the notch 65. The attachment piece 39 passes without entering the notch 65, and the cover 22 can be rotated without any trouble.

  The position where each mounting piece 39 enters each groove 60 is a position where the battery 16 of the cover 22 does not interfere with the head 49a of the screw 49 of the base 21. Therefore, as shown in FIG. When entering 60, the battery 16 of the cover 22 approaches or comes into contact with the base 21, and the cover side fitting portion 33 of the cover 22 is fitted to the base side fitting portion 53 of the base 21.

  Furthermore, as shown in FIG. 4 and FIG. 6B, the attachment pieces 39 that have entered the groove portions 60 engage with the engagement portions 61, and the cover 22 can be attached to the base 21.

  Thus, when the cover 22 is fitted and attached to the base 21, if each attachment piece 39 is to be fitted at a position where it abuts against the restriction portion 59 of the attachment guide 57, each of the attachment pieces 39 and the restriction portion 59 are provided. To prevent the head 49a of the screw 49 of the base 21 and the battery 16 of the cover 22 from interfering with each other, the fitting between the base 21 and the cover 22 is restricted. The mounting piece 39 can be rotated to the position where it enters each groove 60, and the position where each mounting piece 39 enters each groove 60 interferes with the head 49a of the screw 49 of the base 21 and the battery 16 of the cover 22. Therefore, if each mounting piece 39 is rotated to a position where it enters each groove portion 60, the base 21 and the cover 22 are fitted, and each mounting piece 39 is an engaging portion on one side in the circumferential direction of the groove portion 60. 61, so that the battery 16 of the cover 22 can be attached close to the base 21. It can be attached to and over scan 21 and the cover 22 securely, the wiring device 11 may slimmer.

  Since the inclined surface 62 that is continuous between the restricting portion 59 and the bottom surface of each groove portion 60 is provided, each mounting piece 39 that contacts the restricting portion 59 enters each groove portion 60 through the inclined surface 62 and is directly engaged with the engaging portion 61. It is possible to attach the cover 22 to the base 21 with certainty that the attachment pieces 39 are not easily mistaken for the attachment pieces 39 that have just entered the groove portion 60.

  Since the mounting piece 39 has a relationship in which the circumferential width b of the mounting piece 39 is wider than the circumferential width a of the notch 65 of the base 21, the mounting piece 39 passes through without entering the notch 65, and the cover 22 is rotated without hindrance, and the mounting piece 42 caught on the fitting portion 61 of the base 21 is supported by the supporting piece 41 in addition to the outer piece 40, so that the mounting piece 39 has high rigidity, and the mounting piece The state in which 39 is engaged with the engaging portion 61 can be reliably maintained.

  Further, when installing the wiring device 11 on the wall surface, one screw 49 is screwed into the wall surface in a temporarily fixed state, and a head 49a of the screw 49 is a mounting hole 50 for wall mounting on the upper side of the base 21. Through the hole 51, the small-diameter hole portion of the daruma hole 51 is hooked on the screw shaft portion of the screw 49, and the screw 49 is screwed to the wall surface through the mounting wall 50 for mounting the lower wall surface. Tighten and attach the base 21 to the wall.

  Thereafter, as in the case of the ceiling installation described above, the cover 22 is fitted and attached to the base 21 attached to the wall surface. When the wiring device 11 is installed on the wall surface, the cover 22 is fitted to the base 21 by adjusting the direction of the cover 22 so that the operation button 32 of the cover 22 is on the lower side.

  In addition, in both the ceiling installation and the wall installation, when removing the cover 22 from the base 21, the cover 22 is removed and rotated in the rotation direction (counterclockwise when viewed from the front of the cover 22). Each mounting piece 39 disengages from each engaging portion 61 of the base 21 and moves to each groove portion 60 and rides on the restricting portion 59 through each inclined surface 62, so that the cover side fitting portion 33 of the cover 22 is automatically moved to the base 21. And the cover 22 can be removed from the base 21.

  At this time, since each mounting piece 39 rides on the restricting portion 59, even if the battery 16 of the cover 22 rotates to a position where it overlaps the head 49a of the screw 49 of the base 21 when viewed from the front of the cover 22, the cover 22 The battery 16 does not interfere with the head 49a of the screw 49 of the base 21.

11 Wiring equipment
21 base
22 Cover
39 Mounting piece
43 Protrusion
49 screw
57 Installation guide
59 Regulatory Department
60 Groove
61 Engagement part
62 Inclined surface

Claims (2)

A base installed on the installation site with a screw passing through a position on the circumference off the center;
A cover that is fitted with the base in the center and has a protrusion protruding toward the base on a part of the circumference corresponding to the screw position of the base;
A plurality of mounting pieces provided on a circumference on the outer diameter side of the protruding portion of the cover in one of the base and the cover;
On the other side of the base and cover, the base and cover are fitted at a height where the mounting piece abuts on the circumference corresponding to the position of the mounting piece and the base screw and cover protrusion do not interfere with each other. The mounting part enters and the base and the cover are allowed to fit in a position where the base part and the protruding part of the cover do not interfere with the restriction part that restricts and allows sliding in the circumferential direction in the contact state. An attachment guide provided with a plurality of groove portions and a plurality of engagement portions provided on one side in the circumferential direction of each groove portion to which attachment pieces entering the groove portions are engaged and attached;
Wiring equipment characterized by comprising. The wiring device according to claim 1, wherein the mounting guide is provided with an inclined surface that is continuous with the regulating portion and the bottom surface of the groove portion on the other circumferential side of the groove portion.

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