JPH0540559Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) This invention is installed on the panel surface of a control panel, power panel, operation panel, etc. (hereinafter referred to as the panel), and allows operators and supervisors to This invention relates to a panel annunciator that notifies the presence and type of signal input by emitting a signal sound.

(Prior Art) Conventionally, in panel alarms, as a means of providing mounting screws for mounting on the panel surface, the mounting screws have been provided in a separate package or provided in a state where they are fastened to the panel alarm with nuts. However, in the former case, there was a risk of loss, and in the latter case, there were problems such as not being easy to remove.

(Purpose of the invention) The present invention was devised in view of the above-mentioned problems, and provides a structure for holding a mounting screw in a detachable manner, and provides a means for incorporating it in accordance with the required strength during mounting. , the most appropriate mounting means will be selected and provided as appropriate.

(Means for Solving the Problems) The present invention provides a panel alarm having a mounting hole at each corner of the front mounting part, a step portion into which the head of the mounting screw is inserted and seated, and an inner surface having a hexagonal shape and a stepped portion. The seated mounting screw head is provided with a rib for preventing rotation that stands upright to surround the stepped portion, and a convex piece that stands upright at a corner of the inner surface of the cover opposite to the stepped portion. It is fitted to create a structure that prevents the mounting screw from coming off.

(Example) Hereinafter, one embodiment of the panel alarm according to the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 denotes a main body that forms the appearance of the panel alarm according to the present invention and houses corner components, and includes a front mounting part 2 projecting out in an approximately square shape, a cylindrical part housing the components, and , the rear part of the main body 1 is cut out in a fan shape to provide a stepped part, and the stepped part is provided with a terminal 11 and a terminal block part formed by connecting inter-terminal ribs 12.

As mentioned above, the front mounting part 2 has an overhanging square shape, and has mounting holes 21 in each corner into which the mounting screws 4 are inserted, and a stepped part 24 on the cover side in which the screw head is seated. The mounting screw 4 is inserted and seated at the periphery of the mounting hole 21, and the stepped portion 24 has a hexagonal inner surface.
A rib 22 standing upright to surround the mounting screw 4 prevents it from rotating. Then, it is screwed onto the board surface with the mounting screws 4 via the sheet 23 attached to the back surface of the front mounting section 2.

Furthermore, although bolts are normally used as the mounting screws 4, wood screws or the like may be used depending on the mounting surface.

Reference numeral 3 denotes a cover that is fitted on the front surface and surrounds the front mounting portion 2, and has a sound emitting hole 31 for signal notification and a fitting rib on the periphery, and has a rib that is erected on the front mounting portion 2. It is locked with 22. Further, a convex piece 32 is provided at a corner of the inner surface of the cover to face the stepped portion 24, and the head of the mounting screw is fitted between the two stepped portions 24 of the front mounting portion to form a holding structure. According to this mounting structure, there is no need for a holding member such as a nut for preventing the screw from coming off. Therefore, each mounting screw is held in an unfixed state and can be easily attached and detached during mounting work, and the number of screws can be reduced or replaced with another type of screw immediately as necessary.

The internal structure of the main body 1 is formed by inserting printed wiring boards 61 and 62 for achieving predetermined functions, and fixing them by screwing with ribs or the like. The printed wiring board 62 is approximately circular, has a terminal block wiring and a volume control wiring part, is fitted into the bottom of the main body 1, is supported by a plurality of ribs, and is screwed onto the ribs. Printed wiring board 6
1 has a substantially square shape with the central part of one side cut out, and the upper and lower two sides are inserted into the insertion ribs of the main body 1,
One side opposite to the cutout is brought into contact with the printed wiring board 62, and the elastic piece 51 is elastically attached to the center cutout, so that the speaker 5 is pressed and fixed to the bottom surface of the speaker 5 inserted through the opening of the main body 1. Here, if the speaker 5 is made drip-proof and fastened to the mounting surface via an O-ring, drip-proofness inside the main body can be ensured at the same time.

Next, the internal circuit will be explained based on FIG.
The panel annunciator according to the present invention notifies the user with a signal sound set according to the type of input, and generally consists of an input section, a power supply circuit section, a signal drive section, and an output section as a circuit configuration. 11a, 11b, 11
C and 11d are timbre selection switches, and signals are input by short-circuiting their respective terminals and the common terminal 11e. The input signal is discriminated by the input circuit IC of the timbre selection circuit D, and the melody IC of the timbre main circuit C generates a signal tone corresponding to the input. The generated signal tone passes through a volume control circuit B and an amplification circuit A, and its volume is adjusted and amplified by a volume control volume, and then amplified by a loudspeaker 5. Normally, an alarm sound, a bell sound, a buzzer sound, a warning bell sound, etc. are used as the signal sound, but it is also possible to provide a notification using a melody or synthesized voice depending on the type of use by changing the sound generation circuit C.

Furthermore, the mounting structure according to the present invention is not limited to a panel alarm, but can of course be used for mounting structures for electronic devices mounted on walls, including panel mounting.

(Effects) Since the panel alarm according to the present invention loosely fits and retains the mounting screws in a detachable manner, it is possible to easily change the type and number of screws to the most appropriate one at the time of installation.

[Brief explanation of the drawing]

Fig. 1 is a central vertical sectional view showing an embodiment of the panel alarm according to the present invention, Fig. 2 is a front partially broken sectional view, and Fig. 3 is a rear view showing the terminal block structure. FIG. 4 is a circuit configuration diagram, and FIG. 5 is an enlarged sectional view of main parts. 1...Main body, 11...Terminal, 12...Rib between terminals, 2...Front mounting part, 21...Mounting hole, 22...
...rib, 23... sheet, 24... step, 3...
Cover, 31... Sound emitting hole, 32... Convex piece, 4...
Mounting screw, 5... Speaker, 61... Board, 62
... Board, 63 ... Volume, 7 ... Nameplate.

Claims (1)

[Scope of Claim for Utility Model Registration] A panel alarm that includes an amplifier circuit, a volume control circuit, a tone generation circuit, and a tone selection circuit, and that broadcasts a signal sound from a speaker, which has a cylindrical main body, A square-shaped front mounting part having a means for attaching to the board surface, and surrounding the front mounting part,
A cover having a sound emitting hole is integrally formed with the front mounting part, and a mounting hole is provided at each corner of the front mounting part,
The upper part of the mounting hole is provided with a step and a rib that stands upright surrounding the step, and a mounting screw head is fitted between the step and the corner of the inner surface of the cover, facing the step. A panel alarm, characterized in that it is configured to have a protruding piece protruding from it.