JPH0325268Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a device that is housed in a switch, particularly an outdoor switch, and provides an acoustic alarm to the outside.

[Prior Art] When installing an acoustic alarm device on a switch, a hole is generally made in the case wall, and a bell or bell is placed close to the inner surface of the hole.
It was customary to install an alarm such as a buzzer.

[Problem that the invention attempts to solve]

When the case is sealed and airtight to prevent the internal equipment of the switch from being contaminated by outside air, the above method cannot be used because holes cannot be provided in the case wall. In addition, if only the alarm part is sectioned off and a hole is provided on the outside of that part, it is troublesome to maintain airtightness at the part where the conductor passes through the alarm, and the alarm itself is susceptible to contamination by outside air. It was a problem.

[Means to solve the problem]

This invention houses an audible alarm device in a sealed case of a switch, and is also capable of emitting an alarm to the outside.A small hole for sound passage is placed within a predetermined range of the alarm device installation location in the switch case. A ring-shaped gasket surrounding the small hole is provided at the periphery of the area, and in the internal space of this gasket, small holes for sound passage are arranged alternately with the small holes. A slit plate having a slit plate is movably arranged, a diaphragm is placed on the packing so that the diaphragm covers the slit plate, and a hole corresponding to the predetermined range is formed on the diaphragm. A holding plate is arranged on the holding plate, and a holding fitting for holding an alarm installed at a position corresponding to the hole is placed on the holding plate, and the holding fitting is tightened and fixed to the switch case. An acoustic device housed in the switch, wherein the inside of the switch case is made airtight by the packing and the diaphragm, and the diaphragm is vibrated by the alarm sound generated from the alarm to issue an alarm to the outside. It is an alarm device.

【Example】

Figures 1 and 2 show embodiments of the present invention;
The figure is a partially cutaway front view showing the internal structure.
The figure is a side view of the main parts. In the figure, 1 is a case of a switch, and the inside thereof is kept airtight. A plurality of small holes 1c through which sound passes are provided within a predetermined range 1b of the alarm device mounting location 1a in the case 1, and a ring-shaped packing 2 surrounding the small holes 1c is provided at the periphery of the range. In the internal space 2a of the packing 2, a slit plate 3 having small holes 1c for sound passage arranged alternately with the small holes 1c is movably arranged. A mounting bolt 5 is installed in the case 1 on the outside of the packing 2. Vibration plate 4 on top of packing 2
is arranged so that the diaphragm 4 covers the slit plate 3, and furthermore, a holding plate 6 having a hole 6a corresponding to the predetermined range 1b is arranged on the diaphragm 4. The holding plate 6 is provided with a mounting hole 6b into which the mounting bolt 5 is inserted, and a ring-shaped packing 7 having an inner diameter corresponding to the hole 6a of the holding plate is provided. A holding fitting 9 for holding the installed alarm 8 is arranged at a position corresponding to the position corresponding to the switch case 1. The inside of the switch case is made airtight by the gasket 2 and the diaphragm 3. The inner diameter 7 of the presser plate 6 corresponding to the hole 6a of the presser plate is a ring-shaped gasket, and an acoustic alarm 8 such as a buzzer comes into contact with the presser plate 6. A spacer 1 is provided between the holding plate 6 and the inner wall of the case 1.
1 is inserted to regulate the compression allowance of the packing 2. The holding fitting 9 is formed in a U-shape so as to surround the alarm 8, and both ends thereof extend in an L-shape to form a tightening part, and a mounting hole 9a is provided. The slit plate 3 has a plurality of small holes 3a for passing sound.
The holes 3a are arranged so that they do not overlap with the small holes 1c of the case even when the slit plate 3 moves or rotates, but are arranged alternately to prevent needle-like foreign matter from entering from outside the case. The diaphragm 4 is also held by a slit plate to prevent damage to the diaphragm 4. For example, as shown in Fig. 2, the arrangement is as follows:
c is placed on the center of range 1b and the circumference of diameter r ₂ ,
The small holes 3a of the slit plate are arranged on the circumference with diameters r ₁ and r ₃ such that r ₁ < r ₂ < r ₃ , and the distance between r ₁ , r ₂ , and r ₃ is the same as that of the slit plate 3. is larger than the distance that can be moved within Patsukin 2. The diaphragm 4 is composed of a thin metal plate or a thin resin film, and may be made of one piece or two or more pieces stacked together for safety. For example, in one embodiment, two polyester films having a thickness of approximately 0.1 mm are used in a stacked manner. This diaphragm 4 maintains airtightness between the inside of the case 1 and the outside air, and also resonates with the sound of the alarm device 8 to enable the sound of the alarm device 8 to be transmitted to the outside. Reference numeral 8a denotes a connection terminal protruding from the alarm 8 and connected to wiring within the case 1.

[Effect of the idea]

Since the present invention is constructed as described above, the alarm can be housed in the switch while eliminating the influence of outside air, and the alarm sound of the internal alarm can be transmitted to the outside without compromising the airtightness of the case. can be transmitted. In addition, even if needle-like foreign objects enter from outside the case, they are caught by the slit plate, so the diaphragm will not be damaged, and it is possible to provide an acoustic alarm device that is housed in a switch with a simple structure and low cost. .

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing the internal structure, and FIG. 2 is a side view of the main parts thereof. 1... Case, 2... Packing, 3... Slit plate, 4... Vibration plate, 6... Holding plate, 7... Packing, 8... Alarm, 9... Holding metal fitting, 11...
Spacer.

Claims (1)

[Scope of utility model registration request] A sound passage small hole 1c is provided within a predetermined range 1b of the alarm device mounting location 1a in the switch case 1, and a ring-shaped packing 2 surrounding the small hole 1c is provided at the periphery of the range 1b. A slit plate 3 having small sound passage holes 3a arranged alternately with the small holes 1c is movably arranged in the internal space 2a of the packing 2, and a diaphragm is placed on top of the packing 2. 4 is arranged so that the diaphragm 4 covers the slit plate 3. Furthermore, a presser plate 6 having a hole 6a corresponding to the predetermined range 1b is arranged on the diaphragm 4. A holding fitting 9 for holding the alarm device 8 attached to the position corresponding to the hole 6a is arranged on the plate 6, and the holding fitting 9 is tightened and fixed to the switch case 1, and the packing 2 and A switch characterized in that the interior of the switch case 1 is made airtight by a diaphragm 4, and an alarm sound generated from the alarm device 8 vibrates the diaphragm 4 to issue an alarm to the outside. Acoustic alarm device stored inside.