JP5735355B2 - Alarm device - Google Patents

Description

  The present invention relates to an alarm device attached to a ceiling or the like of a room, and more particularly to an attachment structure thereof.

  This type of alarm device includes an attachment base that is attached to the ceiling and an alarm device body that is detachably attached to the attachment base, and has an engagement portion that protrudes horizontally on the alarm device body side. A piece is provided, and a blade receiving portion is provided in contact with the mounting base so that the engaging portion overlaps, and the engaging portion is rotated by rotating the alarm body in the circumferential direction with respect to the mounting base in a horizontal direction. There is a type in which the main body of the alarm is installed on the ceiling via the mounting base while being in contact with and engaging with the blade receiving portion (see, for example, Patent Document 1).

JP 2009-237745 A

  In the conventional alarm device as described above, the alarm device main body is rotated in the circumferential direction and the engagement portion is brought into contact with the blade receiving portion to form an engagement state. Since a space for moving the engaging portion has to be provided, there has been a problem in that the thinning of the apparatus is hindered. In addition, since the total length of the cable that electrically connects the mounting base and the alarm device main body must be increased by the amount of rotation of the alarm device main body, a large space is required to store the cable. There was also a problem that the thickness of the device increased by the space.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to reduce the thickness of the apparatus.

In order to achieve this object, the present invention provides a base formed in an inverted bottomed cylinder fixed to an installation surface and a detachably attached to the base in a stacked state so that the ceilings of each other face each other. Provided with a fulcrum part that supports the apparatus main body so as to be rotatable in the axial direction of the cylindrical part, and from the fulcrum part to a portion on the opposite side in the circumferential direction. A notch is provided, and a pair of first engaging portions having a first engaging surface is provided at both ends of the notch in the circumferential direction, and the device main body is rotated around the fulcrum portion in the device main body. By moving, an engagement piece that is engaged with the notch while being elastically deformed via a second engagement portion that is in sliding contact with the first engagement portion is provided. By engaging the engagement piece into the notch, the engagement piece is opposed to the first engagement surface. And a second engagement surface for restricting the device main body from coming off from the base, wherein the first and second engagement surfaces release the engagement of the second engagement portion with respect to the first engagement portion. The second engagement surface moves along the inclination of the first engagement surface to the first engagement surface, and the second engagement surface moves relative to the first engagement portion. A stopper for restricting the disengagement of the second engagement portion is provided .

  According to the present invention, in any one of the above inventions, a slight gap is provided between the first engagement surface and the second engagement surface, and the apparatus main body is pressed against the base to In addition, an elastically deformable pressing element that urges the second engaging surfaces in a direction to contact each other is provided.

  According to the present invention, the first and second engagement portions are not provided on the ceiling portions of the base and the apparatus main body, and are rotated in the axial direction of the cylindrical portion of the base, whereby the first and second engagement portions are provided. The parts are engaged. For this reason, since the apparatus main body can be attached to the base in a state of being in contact with each other without providing a gap between the ceiling portions of the base and the apparatus main body, the apparatus can be thinned. In addition, since the first and second engagement surfaces are inclined, the apparatus main body can be reliably prevented from falling off the base.

  According to one of the inventions described above, since the engagement of the first and second engaging portions is held by the stopper, it is possible to reliably restrict the apparatus main body from dropping off from the base.

  According to one of the inventions described above, since the slight gap is provided between the first engagement surface and the second engagement surface, it is easy to remove the apparatus main body from the base, and the gap Since the pressing member for removing the device is provided, it is possible to reliably regulate the dropping of the apparatus main body with respect to the base.

It is a perspective view which decomposes | disassembles and shows the alarm device which concerns on this invention. It is a top view of the alarm device concerning the present invention. It is a bottom view of the alarm device according to the present invention. It is a front view of the alarm device concerning the present invention. It is the VV sectional view taken on the line in FIG. It is the VI-VI sectional view taken on the line in FIG. It is the VII-VII sectional view taken on the line in FIG. It is an enlarged view of the VIII part in FIG. FIG. 9 is an operation diagram based on FIG. 8 for explaining an operation of attaching the apparatus main body to the base in the alarm device according to the present invention. It is an enlarged view of the X section in FIG. It is the perspective view which looked at Drawing 10 from the upper part. It is an enlarged view of the XII part in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. An alarm device generally indicated by reference numeral 1 in FIG. 1 includes a base 3 attached to a ceiling 2 as an installation surface, and a device main body 4 detachably attached to the base 3 in a stacked state as shown in FIG. Prepare. The base 3 is formed in a flat inverted bottomed cylindrical shape by the ceiling portion 5 and the cylindrical portion 6. A cable introduction hole 5 a for introducing a cable (not shown) wired to the ceiling 2 into the base 3 as shown in FIG. 2 is provided at the center of the ceiling portion 5.

  The ceiling portion 5 is provided with three pairs of screw insertion holes 7A, 7B, 7C at intervals of 180 ° in the circumferential direction so as to sandwich the cable introduction hole 5a. Among these, the screw insertion holes 7A and 7A are provided with curved grooves 8A and 8A extending in the counterclockwise direction as shown in FIG. Further, curved grooves 8B, 8B and grooves 8C, 8C extending in the clockwise direction are connected to the screw insertion holes 7B, 7B and the screw insertion holes 7C, 7C.

  A part of the cylindrical part 6 in the circumferential direction is provided with a notch 9a having a rectangular shape in side view, and the ceiling part 5 is provided with a notch 9b having a substantially rectangular shape in plan view corresponding to the notch 9a. It has been. At both ends in the circumferential direction of the cylindrical portion 6 of the notch 9a, first engaging portions 11 and 11 projecting in opposite directions extend in the axial direction of the cylindrical portion 6 (arrow CD direction). It is provided to exist. As shown in FIG. 11, the first engaging portions 11, 11 have end portions on the ceiling portion 5 side inclined downward by an angle α toward the radially outer side (arrow A direction) of the ceiling portion 5. An engagement surface 11a is formed. As shown in FIG. 8, the first engagement surface 11a is positioned at a position lower than the upper end of the cylindrical portion 6 by a height H1. Further, a stopper 11b is provided upright at the end of the first engagement surface 11a in the direction of arrow A, and the lower end surface 11c is chamfered with a curved cross section.

  As shown in FIGS. 2 and 11, the end surface 5 b provided with the notch 9 b of the ceiling portion 5 is L-shaped in a plan view that is elastically deformable toward the radially outer side (arrow A direction) of the ceiling portion 5. A pair of pressing elements 12 and 12 are projected. Convex portions 12a and 12a project from the lower surfaces of the floating end portions of the pressers 12 and 12 as shown in FIG. As will be described later, when the apparatus main body 4 is attached to the base 3, the presser 12 removes the gap 26 set between the first engagement surface 11a and the second engagement surface 23c. 4 is pressed.

  As shown in FIG. 1 and FIG. 5, as a pair of fulcrum portions, a support is provided at a position 180 ° apart in the circumferential direction from the portion where the notch 9 a of the cylindrical portion 6 is provided. The protrusions 13 and 13 project from the lower end of the cylindrical portion 6 toward the inside in the radial direction. In FIG. 1, reference numeral 14 denotes a terminal mounting seat provided integrally with the ceiling portion 5, to which the terminal 15 is mounted. The terminal 15 is electrically connected to a cable (not shown) introduced from the cable introduction hole 5a at one end and is perpendicular to the lower side so that the conducting portion 15a is orthogonal to the ceiling 5 at the other end. It is bent.

  The apparatus main body 4 described above is generally constituted by a case 20, a lens 21, and a cover 22 as shown in FIG. The case 20 is formed by an outer case portion 20a formed in a substantially cylindrical shape, and a mortar-shaped inner case portion 20b extending in the center direction from the lower end of the outer case portion 20a. On the surface side, there are provided three holding portions 20c projecting toward the central direction at equal angles in the circumferential direction.

  The lens 21 is formed in a dome shape, is held by the holding portion 20c of the case 20, and is attached to the case 20 together when the cover 22 is attached to the case 20 as described later.

  As shown in FIGS. 1 and 5, the cover 22 is formed in an inverted bottomed cylindrical shape by a ceiling portion 22a and a cylindrical portion 22b, and a screw inserted from the ceiling portion 22a side is attached to the back side of the case 20 described above. The cylindrical portion 22b is attached to the case 20 together with the lens 21 in a state where the cylindrical portion 22b is exposed from the cover 22 by being screwed to standing bosses (both not shown).

  As shown in FIG. 1, an engagement piece 23 to be engaged in the notch 9a of the base 3 is erected integrally with the cylindrical portion 22b of the cover 22 in the axial direction of the cylindrical portion 22b. The engagement piece 23 is formed to be elastically deformable in the radial direction of the cylindrical portion 22b. A pair of second engaging portions 23a and 23a are integrally projected in the left-right direction on both sides of the upper end of the engaging piece 23, and the upper portion of the second engaging portion 23a is shown in FIG. As shown, a chamfer 23b is provided.

  Further, the lower surface of the second engagement portion 23 forms a second engagement surface 23c that is inclined downward by an angle α toward the arrow A direction as shown in FIG. As described above, when the engagement piece 23 is engaged with the notch 9a, the second engagement surface 23c is spaced from the first engagement surface 11a by a distance δ. It is comprised so that it may have the clearance gap 26 which may become, and may oppose. As shown in FIG. 5, a pair of support projections 13 and 13 of the base 3 are provided at the lower end of the portion of the cylindrical portion 22b of the cover 22 that is spaced 180 ° circumferentially from the portion where the engagement piece 23 is formed. A pair of stepped portions 24 (only one stepped portion 24 is shown) is provided. In FIGS. 1 and 3, reference numeral 25 denotes a discharge port that emits an alarm sound in the event of an emergency such as a fire.

  Next, a method for attaching the alarm device 1 configured as described above to the ceiling 2 will be described. First, in a state where one end of a cable (not shown) wired to the ceiling 2 is introduced into the base 3 from the cable introduction hole 5a, a pair of screws, for example, is inserted from the three pairs of screw insertion holes 7A, 7B, 7C. The insertion holes 7A and 7A are selected, and screws (not shown) inserted through the pair of screw insertion holes 7A and 7A are screwed into the ceiling 2. Thereafter, the base 3 is slightly rotated clockwise in FIG. 2 so that the heads of the screws engage with the grooves 8A and 8A, so that the base 3 is attached to the ceiling 2 via the screws. In this state, one end of the cable that has been introduced into the base 3 from the cable introduction hole 5 a is electrically connected to the terminal 15.

  Next, the apparatus main body 4 is grasped by hand and moved upward from the vertically lower side of the base 3, and the step 24 of the cover 22 is engaged with the support protrusion 13 of the base 3 as shown in FIG. As the center of rotation, the apparatus body 4 is rotated counterclockwise in the drawing (the axial direction of the cylindrical portion 6, the direction of arrow C). Since the chamfered portion 23b of the second engaging portion 23a of the engaging piece 23 of the rotated device body 4 is engaged with the lower end surface 11c of the first engaging portion 11 of the base 3 as shown in FIG. The second engaging portion 23a enters the inside of the first engaging portion 11 (in the direction of arrow B). Further, when the apparatus main body 4 is rotated counterclockwise (moved upward in FIG. 9), the second engagement portion 23a is in sliding contact with the first engagement portion 11, and the engagement piece 23 is the radius of the cover 22. The second engagement surface 23c of the second engagement portion 23a is slightly elastically deformed toward the inner side (the direction of arrow B), and the first engagement surface 11a of the first engagement portion 11 as shown in FIG. The cover 22 is fitted into the cylindrical portion 6 of the base 3.

  In this state, since the dimension H2 in the height direction of the second engaging portion 23a is shorter than the distance H1 from the upper end of the cylindrical portion 6 of the first engaging surface 11b, as shown in FIG. The upper end surface of the joint portion 23 a does not protrude upward from the upper end surface of the cylindrical portion 6.

  Here, as described above, when the presser 12 is not provided, a gap 26 with a slight interval δ is formed between the first engagement surface 11a and the second engagement surface 23c. By providing the child 12, the convex portion 12a of the pressing element 12 is brought into contact with the ceiling 22a of the cover 22 as shown in FIG. Press in the direction of arrow B. Therefore, as shown in FIG. 8, when the cover 22 is pressed downward, the second engagement portion 23a also moves slightly downward, and as a result, the first engagement surface 11a and the second engagement portion are moved. The first engaging surface 11a and the second engaging surface 23c are in contact with each other without forming a gap 26 between the mating surface 23c.

  When the first engagement surface 11a and the second engagement surface 23c are in contact with each other and the second engagement portion 23a is engaged with the first engagement portion 11, the cover 22 is fitted into the cylindrical portion 6 of the base 3. In this state, the apparatus main body 4 is attached to the base 3. In this state, as shown in FIGS. 5 and 6, the ceiling portion 5 of the base 3 and the ceiling portion 22 a of the cover 22 are in contact with each other.

  As described above, the first engaging portion 11 is provided in the cylindrical portion 6 of the base 3, the engaging piece 23 is provided in the cylindrical portion 22 b of the cover 22, and the second engaging portion 23 a is provided in the engaging piece 23. Thus, the first and second engaging portions 11 and 23 a are not provided on the ceiling portion 5 of the base 3 and the ceiling portion 22 a of the apparatus body 4 that is abutted against the ceiling portion 5. Moreover, the first and second engaging portions 11 and 23a are engaged by rotating the apparatus main body 4 in the axial direction (arrow CD direction) of the cylindrical portion 6 of the base 3. For this reason, since the apparatus main body 4 can be attached to the base 3 in a state of being in contact with each other without providing a gap between the bottom 5 of the base 3 and the ceiling portion 22a of the apparatus main body 4, the alarm device 1 is thin. Can be achieved.

  Further, by bending the conducting portion 15a of the terminal 15 in a direction perpendicular to the ceiling portion 5, the device main body 4 is moved in a direction perpendicular to the ceiling portion 5 of the base 3 (arrow C direction) to thereby form the device main body. When 4 is attached to the base 3, the conducting portion 15a can be directly coupled to a connector (not shown) or the like disposed on the apparatus body 4 side without a cable.

  In addition, the first engagement surface 11a and the second engagement surface 23c that are inclined downward in the direction of the arrow A are in contact with each other, so that the movement of the second engagement portion 23a in the direction of the arrow B is restricted. The For this reason, the movement of the first and second engagement surfaces 11a and 23c in the direction of releasing the engagement of the second engagement portion 23a with respect to the first engagement portion 11 is restricted. Dropping from the base 3 can be prevented.

  Also, by providing the stopper 11b at the end of the first engagement surface 11a in the direction of arrow A, the second engagement portion 23a moves in the direction of arrow A along the inclination of the first engagement surface 11a. Since movement in the direction in which the engagement of the second engagement portion 23a with the first engagement portion 11 is released is restricted, the apparatus main body 4 can be prevented from falling off from the base 3.

  Next, when the apparatus main body 4 attached to the ceiling 2 via the base 3 is removed from the base 3 by maintenance inspection or the like, the second engagement portion 23a is pressed with the finger in the direction of arrow E as shown in FIG. To do. Since this pressing also presses the second engaging portion 23a upward (in the direction of arrow C), it resists the pressing force downward (in the direction of arrow D) of the second engaging portion 23a by the pressing element 12. Thus, the second engagement portion 23a slightly moves upward. Due to this movement, a gap 26 having a distance δ is formed between the first engagement surface 11a and the second engagement surface 23a, so that the engagement of the second engagement portion 23a with the first engagement portion 11 is released. Therefore, it is easy to remove the apparatus main body 4 from the base 3.

  In the present embodiment, the cable wired to the ceiling 2 and the apparatus main body 4 side are electrically connected via the terminal 15, but the cable is directly connected without using the terminal 15. Even in such a case, since the apparatus main body 4 is not rotated in the circumferential direction in order to attach the apparatus main body 4 to the base 3, the space for storing the cable can be minimized. 1 can be reduced in thickness.

  DESCRIPTION OF SYMBOLS 1 ... Alarm apparatus, 2 ... Ceiling (installation surface), 3 ... Base, 4 ... Apparatus main body, 5 ... Ceiling part, 9a ... Notch, 11 ... 1st engaging part, 11a ... 1st engaging surface, 12 ... Presser, 12a ... convex part, 13 ... support projection (fulcrum part), 15 ... terminal, 20 ... case, 21 ... lens, 22 ... cover, 22a ... ceiling part, 23 ... engagement piece, 23a ... second engagement Part, 23c ... 2nd engagement surface, 24 ... step part, 26 ... clearance gap.

Claims (2)

A base formed in an inverted bottomed cylindrical shape fixed to an installation surface, and a device main body that is detachably attached to the base in a stacked state so as to abut each other's ceiling.
A cylindrical portion of the base is provided with a fulcrum portion that rotatably supports the apparatus main body in the axial direction of the cylindrical portion, and a notch is provided at a portion on the opposite side in the circumferential direction from the fulcrum portion,
A pair of first engaging portions having a first engaging surface are provided at both ends of the notch in the circumferential direction,
By rotating the device main body around the fulcrum portion, the device main body is inserted into the notch while being elastically deformed via a second engagement portion that is in sliding contact with the first engagement portion. An engagement piece is provided,
A second engaging surface that contacts the first engaging surface and restricts the device body from coming off from the base by engaging the engaging piece into the notch into the second engaging portion. Provided,
The first and second engagement surfaces are inclined so as to restrict movement in a direction for releasing the engagement of the second engagement portion with respect to the first engagement portion. The second engagement surface moves along the inclination of the first engagement surface, and a stopper is provided for restricting the disengagement of the second engagement portion with respect to the first engagement portion . Alarm device characterized by. Providing a slight gap between the first engagement surface and the second engagement surface;
The base, No placing serial to claim 1, characterized in that a pressed first and elastically deformable presser to the second engagement surface between biases to Taise' said apparatus body Alarm device.

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