JPH04104390U - fire detector - Google Patents

Abstract

(57) [Summary] [Purpose] To create a contact mechanism that has uniform quality of contacts on a contact plate, is easy to manufacture, has good contact surface condition, and has excellent corrosion resistance. Get a fire detector with. [Structure] A protruding part is formed on a metal plate by pressing etc.
A thin film of a corrosion-resistant metal is formed on at least the protruding portion by plating or the like. When the metal plate is cut into a predetermined shape using a press or the like and used as a contact plate of a fire detector, a fire detector whose contact mechanism can operate reliably is obtained.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a fire detector, and in particular to a fire detector having a contact plate. be.

0002

[Conventional technology]

As a fire detector, contacts are made by using bimetal inversion or air expansion in the event of a fire. Fire detectors such as fixed temperature type and differential type are known, which close the door and send out a fire signal. ing. In such fire detectors, at least one of the movable or fixed contact plates Also, one side is provided with a contact point to ensure electrical continuity.

0003

[Problem that the idea aims to solve]

Conventional contact plates used in fire detectors such as those mentioned above are flat, truncated, or Contacts are established by spot welding a hemispherical contact member to a base metal plate such as a phosphor bronze plate. It's huge. Therefore, manufacturing is troublesome because the contact members must be welded for each contact plate. At the same time, there is the problem that it is difficult to obtain products of uniform quality due to poor contact, etc. It may peel off due to severe impact.

0004

[Means to solve the problem]

In view of the above points, the present invention aims to make the contacts of the contact plate of uniform quality. As a target, it is easy to manufacture, the surface condition of the contacts can be improved, and it is fire resistant. A protruding part is formed by pressing etc. on at least one metal plate that operates when a disaster is detected. and at least have a thin film of corrosion-resistant metal formed thereon by plating. It is characterized by the following.

[0005]

[Effect]

Form protruding parts on the contact member by pressing etc. at equal intervals, and apply pressure to the protruding parts. A thin film is formed by plating with precious metal, etc., and the protruding part is located at the contact point. You can easily make a contact plate by cutting it so that it looks like this. formed like that The resulting thin film has corrosion resistance and a uniform surface condition.

[0006]

【Example】

Figure 1 is a cross-sectional view of one example of a constant temperature fire detector, where 1 is the resin main body and 2 is the main body. The bimetal 21 is provided at the tip of 1 and turns over at a predetermined temperature (for example, 65°C). A slider is installed at the tip of the main body 1 to transmit the reversal of the bimetal 2 to the contact mechanism. It is a rod that has been pierced. 3 is a heat-sensitive plate provided with a plurality of airflow passage holes (not shown) , 31 is a waterproof O-ring that is sandwiched between the heat-sensitive plates, and 32 is a resin that fixes the heat-sensitive plate 3. It is a pin made of aluminum, etc., and is fixed by, for example, ultrasonic welding.

[0007] 4 is a fixed contact plate mounted on a support 12 provided on the back of the main body 1; 41 is a fixed contact plate; A band-shaped resistor is provided at the tip of the contact plate 4 by, for example, a cladding method such as high-temperature rolling. A contact made of a corrosive metal contact member, 5 is mounted on a support 13 provided on the back of the main body 1. The placed movable contact plate 51 protrudes from the tip of the movable contact plate 5 by press working. The contacts are gold-plated after being applied. The fixed contact plate 4 and the movable contact plate 5 are The movable contact plate 5 is arranged in a V-shape so that the tips of the rods intersect. 21.

[0008] 6 includes circuit parts such as an operation indicator light 61 that lights up when a fire is detected and a resistor (not shown). The soldered printed circuit board 7 is a waterproof packing made of synthetic resin, for example. A signal line 71 integrally formed on the packing 7 is connected to the printed circuit board 6. The printed circuit board 6 connects the wiring on the board with the fixed contact plate 4 and the movable contact plate 5. They are screwed to the struts 12 and 13 of the main body 1 so that conduction is established individually. In addition , 14 are protectors provided as necessary.

[0009] FIG. 2 is a cross-sectional view of the movable contact plate, and the contact plate 5 is a base metal plate such as a phosphor bronze plate. Corrosion-resistant and highly conductive contact 51 is formed by gold plating on the protruding part of 52. There is. This contact plate 5 is protruded from a metal plate 52 by pressing or the like, as shown in FIG. A contact plate material 53 is formed by forming a contact plate material 53 by forming a contact plate material 53 by forming a contact plate material 53 by gold-plating the contact The plate material 53 is formed and cut into a predetermined shape using a press or the like at the position shown by the dashed line in the figure. obtained by

0010 Furthermore, the fixed contact plate 4 may be configured like this movable contact plate 5, and the first press It may be formed into a predetermined shape and plated on the entire surface.

[0011] In the fire detector configured in this way, the heat-sensitive plate 3 receives heat from the fire and When the temperature is reached, the bimetal 2 is reversed and the rod 21 rises to push the movable contact plate 5. and operate the contact mechanism consisting of the fixed contact plate 4 and the movable contact plate 5 (not shown). The fire receiver or the like is made to send out a fire signal, and the operation indicator light 61 is turned on.

0012 In addition, in the above example, the case of a fire detector using bimetal is explained. However, it is possible to operate the contact mechanism by moving the movable contact plate due to, for example, expansion of the air chamber. For fire detectors with contact mechanisms using contact plates, such as differential fire detectors, , can be configured similarly to the embodiment of the present invention.

[0013]

[Effect of the idea]

According to the present invention, the contact portion is attached to the contact plate cut out from the contact plate material using a press or the like. Protruding parts are formed by pressing without spot welding the materials and corrosion-resistant there. Since the contact plate is plated with a metallic metal, it is easy to manufacture and provides a uniform product. This has the effect of providing a fire detector with a high quality contact plate.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a fire detector according to the present invention.

FIG. 2 is a sectional view showing a contact plate used in the present invention.

FIG. 3 is a perspective view showing a contact plate material for constructing the contact plate of the present invention.

[Explanation of symbols]

1 Main body 2 Bimetal 3 Heat sensitive plate 4 Fixed contact plate 5 Movable contact plate 51 Contact 52 Metal plate

Claims (3)

[Scope of utility model registration request] Claim 1: A fire detector having at least one metal plate that operates when a fire phenomenon is detected, wherein the metal plate has a protruding part formed by pressing or the like, and at least the protruding part is coated with a thin film of a corrosion-resistant metal. A fire detector characterized in that: 2. The fire detector according to claim 1, wherein the corrosion-resistant metal thin film is formed by plating. 3. The fire detector according to claim 1 or 2, wherein the corrosion-resistant metal is a noble metal.