JPH0556559B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] FIELD OF THE INVENTION The present invention relates to smoke detectors.

[Background Art] Generally, smoke detectors are mechanically and electrically connected to a base fixed to a ceiling or the like.
It has become common practice to attach a cover to cover the lower surface of the base so that the joint part is not exposed to the outside. However, in conventional smoke detectors, the 11th
As shown in the figure, the sensor section S is housed in a case 1 that forms the outer shell of a cover C that covers the lower surface of the base B, and the function of the sensor section S and other additional functions are the same. Since it is housed inside a case, it was necessary to redesign the entire product in order to obtain variations in functionality and appearance.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its object is to separate the sensor section and the cover and attach them to the base, thereby improving the functionality. An object of the present invention is to provide a smoke detector in which variations can be obtained in terms of appearance and appearance.

[Disclosure of the Invention] (Structure) The smoke detector according to the present invention includes a base fixed to a ceiling or the like, a case in which the smoke sensor is housed, and has a mechanical connection part and an electrical connection part to the base. It consists of a sensor unit and a ring-shaped cover that covers the mounting surface of the sensor unit on the base and is attached to the base with the tip of the sensor unit protruding. In addition to protruding terminal pins that serve as electrodes, at least a pair of hook-shaped hook-shaped tips are protruded, and the base has a pin insertion hole that can be rotated with the terminal pin inserted. A contact spring that electrically contacts the terminal pin is disposed within the base at a location corresponding to the pin insertion hole, and a contact spring that electrically contacts the terminal pin is provided at the location corresponding to the hooking piece. The sensor unit is formed with an engaging surface that fits together, and a large number of variations can be obtained in function and appearance by combining the sensor unit and the cover.

Embodiment 1 As shown in FIG. 1, a sensor unit A containing a smoke sensor is used with a cover C attached to a base B fixed to a ceiling or the like. That is, the base B is fixed to a ceiling or the like using mounting screws, and has a pair of mounting holes 43 that pass through it vertically. At the center of the base B is a recessed hole 41 into which a protrusion 11f (see FIG. 5) protruding from the center of the upper surface of the sensor unit A is inserted.
g is formed. By inserting the protrusion 11f into the recessed hole 41g in this manner, the sensor unit A is positioned with respect to the base B without shaking. Further, as shown in FIG. 5, a terminal pin 11a is provided on the upper surface of the sensor unit A in a protruding manner on the outer peripheral side of the protrusion 11f, and
A hooking piece 11c is provided protrudingly from the upper surface. Hook piece 1
A pair of pieces 1c are formed to face each other in the diametrical direction, and the tip portions are bent into a substantially L shape so as to approach each other to form a hook shape. As shown in FIG. 6, a locking surface 11d, which is the lower surface of the horizontal piece on the distal end side of the hooking piece 11c, is inclined in the circumferential direction, and a recess 11e is formed in the center thereof. On the other hand, on the bottom surface of the base B, as shown in FIG.
A long pin insertion hole 41e into which the terminal pin 11a is inserted is formed.
is arc-shaped along the circumferential direction. In addition, a part of the insertion hole 41f formed on the lower surface of the base B and into which the hooking piece 11c is inserted is narrow.
On the upper surface of the periphery of this part, as shown in Fig. 6,
An engagement surface 41h that is inclined in the circumferential direction is formed. A hook piece 11c is provided at the center of the engagement surface 41h.
A protrusion 41i that can be engaged with a recess 11e formed in the
is installed protrudingly. Therefore, when the hooking piece 11c is inserted into the insertion hole 41f and the sensor unit A is rotated, the locking surface 11d and the locking surface 41h come into contact and gradually move upward, and the recess 11e aligns with the protrusion 41.
sensor unit A and base B at the time of engagement with i.
A mechanical connection is made between the two.

By the way, as shown in FIGS. 8 and 9, the base B is formed by combining upper and lower half bodies B1 and B2, and the upper half body B1 has a lower half body B2. A contact spring 45 is provided at a location corresponding to the pin insertion hole 41e. contact spring 4
Reference numeral 5 denotes a leaf spring, one end of which is fixed to the base B by a terminal screw 46, and the free end of which is inserted into the pin insertion hole 41.
It is located so that it faces the e. Therefore, when the sensor unit A is attached to the base B, the contact spring 45 comes into elastic contact with the terminal pin 11a, thereby establishing an electrical connection between the terminal pin 11a and the terminal screw 46.

On the other hand, a stepped portion 41d is formed on the lower circumferential surface of the base B so that the diameter on the lower end side becomes smaller, and hook holes 41 are provided at appropriate positions (three locations) of the stepped portion 41d.
c is formed. As shown in FIG. 2, the cover C is formed in a shape that opens upward, and a hook 42b that can be engaged with the hook hole 41c is formed at a suitable position on the inner peripheral surface of the cover C. Since the base B and the cover C are made of a flexible material such as synthetic resin, by attaching the cover C from below to the base B, the hook 42b engages with the hook hole 41c and the cover C is attached to the base B. It is becoming more and more popular. Further, the cover C is formed with an opening 42a into which the sensor unit A is inserted. Therefore, the sensor unit A is placed in the opening 42a of the cover C.
The sensor unit A is fixed to the base B, and the cover C is attached to the base B. Since the sensor unit A and the cover C are attached separately to the base B in this way, the range of design options for the sensor unit A and the cover C is widened.

The ionization type sensor unit A, which can be used as either an ionization type or a photoelectric type, is constructed as shown in FIG. That is, the case 10 includes a bottomed cylindrical body 11 whose upper surface is closed, and this body 1.
1 is formed into a cylindrical shape with a protective cover 12 fitted onto the lower surface of the protective cover 12. Furthermore, the protective cover 12 includes a cylindrical windproof cover 13 that is bonded to the body 11 by adhesive or heat bonding, an insect net 14 that covers the side surface of the windproof cover 13, and a cap that closes the lower end surface of the windproof cover 13. 15. body 11,
Both the windproof cover 13 and the cap 15 are made of synthetic resin molded products. A pair of mounting pieces 11b extend around the upper end of the body 11. The windproof cover 13 has an introduction hole 13a formed around the entire circumference thereof, and the insect screen 14 is arranged so as to cover the entire surface of the introduction hole 13a. The insect screen 14 is formed by punching or etching a sheet metal to have a mesh shape that prevents small insects from entering the case 10 through the introduction hole 13a.

An ionization type smoke sensor is built into the case 10. This smoke sensor includes an internal electrode 22 holding a radiation source 21, an external electrode 23 disposed to cover the internal electrode 22, and a through hole 24a through which radiation emitted from the radiation source 21 passes.
The intermediate electrode 24 is formed with at least one
It is equipped with an internal electrode 22, an external electrode 2
3. The intermediate electrode 24 is mounted on an electrode base 25 made of an insulating material such as synthetic resin. Internal electrode 2
2 consists of a board part 22a formed of a sheet metal and a cover part 22b formed of a sheet metal and coupled to the board part 22a in a fitted manner.
The radiation source 21 is sandwiched between the cover portion 2a and the cover portion 22b. A terminal piece 22c is provided on the substrate portion 22a. A transmission window hole 22d for transmitting radiation from the radiation source 21 is formed in the cover portion 22b. On the other hand, the external electrode 23 is formed of a sheet metal in the shape of a cylinder with a closed bottom and a flange 23a formed on the upper edge, and a plurality of electrodes are formed on the side circumferential surface over almost the entire circumference. Introduction holes 23b are formed.
A plurality of clip pieces 23c are provided upwardly projecting at appropriate positions on the outer periphery of the flange 23a, and terminal pieces 23d are cut and raised at other parts of the flange 23a. The intermediate electrode 24 is formed into a disk shape from a sheet metal, and a through hole 24a through which radiation passes is formed in the center corresponding to the internal electrode 22.
Further, the terminal piece 24b is formed by cutting and bending. By the way, the electrode base 25 is formed into a disk shape, and a cylindrical partition wall 2 is provided at the center of the lower surface of the electrode base 25.
5a is erected, and the intermediate electrode 24 is housed in a portion surrounded by the partition wall 25a. Further, an upwardly recessed storage recess 25b is formed in the center of the portion surrounded by the partition wall 25a, and the internal electrode 22 is accommodated in this storage recess 25b. However, the bottom surface of the storage recess 25b, the inside of the partition wall 25a, and the partition wall 25a
A terminal insertion hole 25c is formed at a suitable location on the outside of the electrode substrate 25 so as to vertically penetrate through the electrode substrate 25, and each terminal piece 22c, 24b, 23d of the internal electrode 22, intermediate electrode 24, and external electrode 23 is inserted therethrough. It is becoming more and more like this. Further, a plurality of pins 25f are protruded from the lower surface of the electrode substrate 25, and these pins 25f are inserted into pin holes 23f and 24c formed in the external electrode 23 and the intermediate electrode 24, respectively, and heated. By crushing the external electrode 2
3 and an intermediate electrode 24 are fixed to an electrode substrate 25. A plurality of legs 25e are provided protruding from the upper surface of the electrode substrate 25.

In this way, the air between the external electrode 23, the intermediate electrode 24, and the internal electrode 22 is ionized by the radiation from the internal electrode 22 mounted on the electrode substrate 25, and the air between the external electrode 23, the intermediate electrode 24, and the internal electrode 22 is ionized. When smoke is introduced into 23, the ionic current changes due to the smoke coming into contact with ionized air, and as a result, the potential of the intermediate electrode 24 changes, making it possible to detect the presence of smoke.

Changes in the ion current are detected by a detection circuit mounted on the printed circuit board 26. The printed circuit board 26 is housed in a cylindrical shield case 27 made of sheet metal and having a closed top and a closed bottom. The detection circuit mounted on the printed circuit board 26 includes an internal electrode 22, an external electrode 23, and an intermediate electrode 24.
The respective terminal pieces 22c, 23d, and 24b are connected and fixed by soldering. Further, the printed circuit board 26 and the electrode substrate 25 are spaced apart by legs 25e protruding from the electrode substrate 25. Insulation between the surface of the printed circuit board 25 and the bottom surface of the shield case 27 is achieved by interposing an insulating sheet between the two or by holding the printed circuit board 25 with the shield case 27 so as to float above the bottom surface. . A clip hole 27b that engages with a clip piece 23c formed on the external electrode 23 is formed at a suitable location on the peripheral wall of the shield case 27. Therefore, by fitting the clip piece 23c and the clip hole 27b, , the electrode part and the circuit part are surrounded by the external electrode 23 and the shield case 27, and the whole is made into a unit.
Case 1
A smoke sensor can be constructed by simply installing the sensor in the 0. A lead wire 26b for connecting to an external circuit is protruded from the top surface of the printed circuit board 26, and the lead wire 26b is inserted into a feedthrough capacitor 27a provided on the bottom surface of the shield case 27 and soldered. It's summery. On the other hand, case 10
A cylindrical terminal pin 11a is insert-molded in the body 11 at a position corresponding to the feedthrough capacitor 27a provided in the shield case 27, and the lead wire 26b is inserted into the terminal pin 11a.
, and connect the lead wire 2 to the tip of the terminal pin 11a.
6 are connected by soldering or spin processing.

On the other hand, a photoelectric smoke detector is constructed as shown in FIG. Here, the relationship among the base 11, shield case 27, and printed circuit board 26 is similar to that of an ionization type smoke detector. In the case of a photoelectric type, a shield cover 28 is fitted on the open side of the shield case 27, and a clip piece 28a that engages with a clip hole 27b of the shield case 27 is formed on the periphery of the shield cover 28. has been done. The printed circuit board 26 is housed in a space surrounded by a shield case 27 and a shield cover 28.

The shield cover 28 forms a fitting groove 28b recessed in a U-shaped cross section along the diameter direction, and a device containing a light emitting element 51 and a light receiving element 52 for smoke detection is installed in the fitting groove 28b. The holder 50 is fitted. Each element 51, 52 is provided on the bottom surface of the fitting groove 40.
Connect the printed circuit board 2 by leading the lead wires to the back side.
Holes 28c and 28d for soldering to 6 are bored.

The element holder 50 is made up of a base 53 made of a synthetic resin molded product and a case body 54. At both ends of the bottom surface of the base 53, there are provided light beams at an angle suitable for entering a dark room in a labyrinth body 17, which will be described later. An inclined recess 53a on which the light-emitting element 51 is placed, and a holding hole 5 for setting the optical axis of the light-receiving element 52 so that the light-receiving surface has an angle suitable for the inside of the dark room of the labyrinth body 17.
3b are formed respectively. Also, the base 5
A locking groove 53c for coupling with the case body 54 is formed on the lower surface of the center of the case body 3. Furthermore, locking claws 53d for coupling to the case body 54 are provided protrudingly from both side surfaces of both ends. On the other hand, the case body 54 is formed into a box shape, and a base 53 is fitted into the opening, and bases 53 are provided on both side walls.
The locking hole 54a is formed so that the locking claw 53d of No. 3 can be engaged from the inside. In addition, the case body 5
An engagement protrusion (not shown) that engages with the engagement groove 53c is protruding from the center inner bottom of 4, and a light projection window through which light comes out from the light emitting element 51 disposed on the base 53. 54b, and the light receiving window 5 facing the light receiving surface of the light receiving element 52.
4c are drilled along the respective optical axes. A collar piece 54d is attached to the periphery of the lower end of the case body 54.
has been extended. The element holder 50 is attached to the fitting groove 2 of the shield cover 28 on the upper surface of this collar piece 54d.
A small protrusion (not shown) is integrally provided that comes into contact with the lower surface of the shield cover 28 and is inserted into a small hole 28e formed in the shield cover 28 when the shield cover 8b is fitted into the shield cover 28. The element holder 50 can be fixed to the shield cover 28 by heating and crushing the tip of the element holder 50.

The labyrinth body 17 is made of a synthetic resin molded product,
It has a labyrinth 17a formed by arranging protrusions with approximately rectangular horizontal sections at equal intervals on a circular bottom plate, and a dark room (not shown) in the center surrounded by the labyrinth 17a and smoke facing the outer periphery. It communicates with the introduction port 17b via the labyrinth 17a. Further, a flange portion 17c is formed integrally or separately on the upper outer periphery. Further, the outer peripheral surface is covered with a cylindrical insect repellent net 14, which is firmly held between the cap 15 which is fitted over the lower end of the labyrinth body 17 and the flange 17c.

Embodiment 2 When sensor unit A is normally connected to a sensor line, other additional functions are not required, but a buzzer may be built in to generate an alarm when sensor unit A is activated. It is conceivable to make it wireless so that when sensor unit A operates, it transmits an alarm signal using radio waves, and in this embodiment, functional parts to provide such additional functions are delivered to cover C. Here is an example.

That is, the cover C shown in FIG. 10a has a built-in buzzer, and is provided with a transparent window 42c through which the buzzer sound is transmitted. Further, FIG. 10b shows an example in which an antenna 42d is provided for wireless implementation. By housing the additional functions in the cover C in this way, the necessary additional functions can be changed simply by replacing the cover C, and smoke detectors with various specifications can be easily obtained.

[Effects of the Invention] As described above, the present invention includes a sensor unit that includes a base fixed to a ceiling or the like, a case in which a smoke sensor is housed, and has a mechanical connection part and an electrical connection part to the base; By adopting a structure consisting of a ring-shaped cover that covers the mounting surface of the sensor unit on the base and is attached to the base with the tip of the sensor unit protruding, the sensor unit can be mounted on the ceiling. Since it will be electrically and mechanically connected to the base as a terminal block fixed to a device, etc., after installing the base to the ceiling etc. using advance wiring, attach the sensor unit with specifications according to the installation location. In addition, since the cover is attached to the base in a manner that covers the mounting surface of the sensor unit on the base and leaves the tip of the sensor unit protruding, the cover allows the sensor unit to be attached to the base. The discontinuous appearance between the sensor unit and the sensor unit can be alleviated to create a harmonious appearance, and the appearance and function can be varied by selecting the color of the cover, etc. There are advantages.

Furthermore, the hook-shaped hook piece protruding from the sensor unit is engaged with the engagement surface provided on the base to mechanically connect the sensor unit to the base, and the terminal pin protruding from the sensor unit is connected to the base. Electrical connection is made between the sensor unit and the base by contacting the provided contact spring, and the above-mentioned mechanical coupling and electrical connection are performed by rotating the sensor unit with respect to the base. This makes it easy to obtain the desired characteristics by making the mechanical connection and the electrical connection with separate parts, and also makes it easy to achieve the desired characteristics of the sensor unit to the base. Connection can be made by simply rotating the sensor unit relative to the base, making it easier to attach the sensor unit to the base during construction and to replace the sensor unit in the event of a failure. It is.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing Embodiment 1 of the present invention;
Figures 2a, b, and c are bottom views, cross-sectional views, and plan views showing the cover used in the same as above, respectively. Figure 3 is an exploded perspective view showing the ionization type sensor unit used in the same as above, and Figure 4 is the same as above. Figures 5a and 5b are respectively a plan view and a side view of the same sensor unit.
Fig. 6 is a side view of the main parts of the same as above, Fig. 7 is a bottom view showing the base used in the above, and Fig. 8 a and b are a bottom view and a sectional view showing the upper half of the base used in the above, respectively , FIGS. 9a and 9b are a top view and a sectional view showing the lower half of the base used in the above, respectively, and FIG.
0A and 0B are perspective views showing an example of a cover used in Example 2 of the present invention, and FIG. 11 is an exploded perspective view showing a conventional example. 11a...terminal pin, 11c...hanging piece, 41
e...Pin insertion hole, 41h...Engaging surface, 45...
Contact spring, A...sensor unit, B...base, C...cover.

Claims (1)

[Claims] 1. A base fixed to a ceiling or the like, a sensor unit including a case in which a smoke sensor is housed, and a sensor unit having mechanical and electrical connections to the base, and mounting of the sensor unit on the base. It consists of a ring-shaped cover that covers the surface side and is attached to the base with the tip of the sensor unit protruding, and terminal pins that serve as electrodes are provided protruding from the end surface of the base side of the sensor unit. At least one pair of hook pieces with hook-shaped tips are provided in a protruding manner, and a pin insertion hole is formed in the base so that the terminal pin can be rotated with the terminal pin inserted, and a portion corresponding to the pin insertion hole is formed in the base. A contact spring that electrically contacts the terminal pin is disposed within the base, and an engagement surface that engages with the hook when the sensor unit is rotated is formed at a portion of the base that corresponds to the hook. A smoke detector characterized by comprising: 2. The smoke detector according to claim 1, wherein a functional component that operates together with the sensor unit is housed within the cover.