JPH0428157Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a motor bell used as a fire alarm, etc.

BACKGROUND ART Conventionally, as this type of bell, one shown in FIG. 4 has been used.

In the figure, a striking rod b is provided on a frame a so as to be reciprocally movable. Reference numeral c denotes a motor, whose rotating shaft rotates an eccentric shaft f through gears d and e, and causes a driven portion g, which is driven by the eccentric shaft f, to move in an arc. Since this driven part g is formed on a swing shaft h that is swingably provided on the frame a,
is swung, a swinging arm i of the same axis h is swung, and a striking rod b is reciprocated via a spring j provided on the swinging arm i, thereby striking a gong k.

Problems to be Solved by the Invention The conventional motor bell has the following problems. That is, since gears d and e are used, the number of manufacturing steps increases accordingly, making manufacturing cumbersome. Moreover, the number of parts increases accordingly, which inevitably increases the cost. Another problem is that when the bell is started, the eccentric shaft f is started from a position far from or close to the swing axis h, which causes a difference in the starting voltage, and the current consumption fluctuates. In some cases, it was a problem.

This invention was made in order to solve the above-mentioned problems, and its purpose was to reduce the number of manufacturing steps compared to the conventional method, making it easier to manufacture and requiring fewer parts. It is an object of the present invention to provide a motor bell that can reduce costs, and that can be started with relatively constant current consumption without any particularly large fluctuations in current consumption as described in the conventional example.

Means for Solving the Problem To describe this invention with reference to drawings showing an embodiment, in FIGS.
A swinging shaft 3 rotatably supported in the horizontal direction; a connecting arm 6 provided at right angles from one end of the swinging shaft 3; Parallel arm 5 provided parallel to the swing shaft 3; Elongated hole-shaped vertical movement portion 7 formed in the parallel arm 5; The swing shaft 3, the connecting arm 6, and the parallel arm 5 form a substantially U-shaped plane. and a swinging member 3 formed of synthetic resin.
a; a bending arm 4 provided on the swing shaft 3 in a direction perpendicular to the swing shaft 3; an eccentric shaft made of synthetic resin that is provided on the frame 1 and rotates by engaging with the vertical movement portion 7; 8; the striking rod 2 connected to the bending arm 4 via a spring 18; a gong provided indirectly or directly on the frame 1 within the range of reciprocating motion of the tip of the striking rod 2; It is a motor bell characterized by consisting of 10 parts.

Operation When the motor 9 is energized, the eccentric shaft 8 provided on the rotating shaft of the motor 9 rotates. As a result, the driven portion 7 of the swing shaft 3 engaged with the eccentric shaft 8
moves up and down in Fig. 2, and the swing axis 3 is indicated by the arrow A3.
be swung in the direction. Therefore, the bending arm 4 of the swing shaft 3 also swings in the same direction, causing the striking rod 2 to reciprocate in the direction of arrow A2 via the spring 18, thereby striking the gong 10.

This motor bell is constructed as described above, and since it does not use gears as in the conventional example, the number of parts is small and costs can be reduced.Also, the swinging member 3a is not linear but flat. Due to the substantially U-shaped configuration, it can be formed compactly, and large fluctuations in current consumption during startup can be eliminated.

Furthermore, since the swinging member 3a and the eccentric shaft 8 of the motor 9 are both made of synthetic resin,
The contact between the driven portion 7 and the eccentric shaft 8 can minimize friction, and together with the fact that the swinging member 3a is compactly formed as described above, the load can be reduced.

Embodiment In FIGS. 1 and 2, reference numeral 12 denotes a support part for the motor 9, which is formed by bending a part of the frame 1, and fixes the motor 9 along a straight line perpendicular to the swing axis 3. It is designed so that it can be done.

Note that 14 indicates a fixing member such as a screw, and 15 indicates a conducting wire of the motor 9. 16 is a rotating shaft of the motor 9, and an eccentric shaft 8 made of synthetic resin is attached to the coaxial shaft 16, for example.
is press-fitted. Moreover, the parallel arm 5
The driven portion 7 is formed, for example, in the shape of an elongated hole, and the eccentric shaft 8 is inserted into and engaged with this elongated hole. and the parallel arm 5, the connecting arm 6,
The swing shaft 3 and the bending arm 4 are all integrally formed, and are made of synthetic resin, for example. Forming in this way may facilitate manufacturing. 17 indicates a pin. Next, reference numeral 18 denotes a spring, which is provided between the holding portion 19 of the striking rod 2 and the bending arm 4. Both 20 and 21 are bearings, and are made of synthetic resin, for example.

The operation of the motor bell of the above embodiment is almost the same as the operation of this invention, so a description thereof will be omitted. However, since the driven portion 7 that engages with the eccentric shaft 8 is both engaged with synthetic resin, no particular supply of lubricant is required. The same applies to the bearings 20 and 21 into which the driving rod 2 is inserted. Further, as shown in FIG. 3, the frame 1 is attached to the gong 10 via the casing 23, that is, indirectly, but this may be done indirectly or, although not shown, There is no problem even if it is directly attached. In the figure, a long hole 24 is formed in the casing 23, and the frame 1 can be moved slightly in the direction of arrow A1 within the casing 23. After being moved slightly in the same direction, it is then fixed with screws, etc. By fixing with the member 24, the distance between the striking rod 2 and the gong 10 can be adjusted, thereby making it possible to fix the frame 1 in a position that produces a good tone. In addition, 25 in the figure is a fixed part, 2
6 indicates a screw.

Effects of the invention This invention is constructed as described above, and since it does not use gears like the conventional example, the number of parts is small and costs can be reduced.

Furthermore, since the swinging member 3a is formed not in a straight line but in a substantially U-shaped plane, it can be formed compactly and large fluctuations in current consumption during startup can be eliminated.

Furthermore, since the swinging member 3a and the eccentric shaft 8 of the motor 9 are both made of synthetic resin,
The contact between the driven portion 7 and the eccentric shaft 8 can minimize friction, and together with the fact that the swinging member 3a is compactly formed as described above, the load can be reduced.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention; Figure 1 is a plan view of the motor bell, Figure 2 is a side view of the same, Figure 3 is a partial sectional view of the motor bell, and Figure 4 is a top view of the motor bell. FIG. 2 is a perspective view of a conventional motor bell. 1... Frame, 2... Batting rod, 3... Swing axis,
4...Bent arm, 5...Parallel arm, 6...Connected arm, 7
... Driven part, 8 ... Eccentric shaft, 9 ... Motor, 1
0...Gong.

Claims (1)

[Scope of utility model registration request] A striking rod 2 reciprocatably provided on the frame 1;
A swing shaft 3 rotatably supported on the frame 1 in the horizontal direction; a connecting arm 6 provided at right angles from one end of the swing shaft 3; a right angle from the tip of the connecting arm 6; , and a parallel arm 5 provided parallel to the swing shaft 3; a long hole-shaped vertical swing portion 7 formed in the parallel arm 5; A swinging member 3a having a U-shape and made of synthetic resin;
a bending arm 4 provided in a direction perpendicular to the frame 1; a motor 9 having an eccentric shaft 8 made of synthetic resin that is provided on the frame 1 and rotates by engaging with the vertical movement portion 7; a spring 18 attached to the bending arm 4; A motor bell characterized in that the motor bell comprises a gong 10 that is indirectly or directly provided on the frame 1 within the range of reciprocating motion of the tip of the striking rod 2 connected through the driving rod 2.