JP2000249779A - Contact mechanism for alarm clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact mechanism for an alarm clock for securing a contact pressure without any machining such as bending and for facilitating control of the pressure contact. SOLUTION: A contact plate 22 is arranged along the surface of a base board 24 when a tongue-shaped engaging part 22b is fitted in a mounting hole 24a of the base board 24 so as to be engaged with it. A movable part 22f of the contact plate 22 is lifted so as to be curved when it is brought into contact with a contact pin 28. Because of resiliency of the curved movable part 22f, a contact pressure between the contact part 22g and the contact pin 28 can be secured. This contact pressure is decided according to the height of the contact pin 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact mechanism operated by a guide mechanism of an alarm clock to operate an alarm function.

[0002]

2. Description of the Related Art A contact mechanism of a conventional alarm clock of this type has a structure as shown in FIG. That is, one end 2a is bent and inserted into the substrate 4 and fixed on the back side with solder or the like, and the other end 2b comes into contact with or separates from the surface of the substrate 4 in conjunction with the operation of the guide mechanism 6. The contact plate 2 is configured as described above, and the contact pin 8 is provided at a position where the contact plate 2 can contact the end 2b.

In the contact plate 2, a movable portion 2d extending from a tip of a rising portion 2c rising from the surface of the substrate 4 is largely bent in advance as shown by a two-dot chain line in FIG. The contact plate 2 is fixed to the substrate 4 so as to partially suppress the amount of displacement of the movable portion 2d which is largely bent in this way, and the contact pressure between the end portion 2b and the contact pin 8 is reduced by suppressing the amount of displacement. Was to be set.

[0004] The movable portion 2d of the contact plate 2 resists its elasticity.
Guide mechanism 6 is supported by a shaft 6c and
Rotate in conjunction with external operation when setting alarm notification time
Guide set car 6a which is the same as this guide set car 6a
An eye supported by the shaft 6c and rotationally driven by the clock train.
It has a notification wheel 6b. In this guide set car 6a
Are convex portions 6d and 6 which come into contact with the axial end surface of the guide wheel 6b.
e is provided, and the guide wheel 6b has a convex portion 6
Concave portions 6f and 6g corresponding to d and 6e are provided on the axial end surface.
Have been. If the alarm notification time does not match the current time
In this case, the projections 6d and 6e of the guide set car 6a are
b is in contact with the end face in the axial direction of
a movable part 2d of the contact plate 2 by the alarm lever part 6h of FIG.
Is pushed up so as to be separated from the surface of the substrate 4 and
The end 2 b of the dot plate 2 is separated from the contact pin 8. Ma
If the alarm notification time and the current time match,
The protrusions 6d and 6e of the wheel set 6a are the concave portions 6 of the guide wheel 6b.
f, 6g, alarm lever of guide set car 6a
The movable portion 2d of the contact plate 2 is
It returns to the surface direction and contacts the contact pin 8.

On the other hand, while the displacement is set by largely bending the contact plate 2 as in the case of the contact plate 2, the contact pressure is not bent beforehand as in the contact plate 12 shown in FIG. Some tried to set. The contact plate 12 has a foot 12a formed by bending a portion protruding laterally at one end, and the tip of the foot 12a is inserted into the substrate 4 and fixed by soldering or the like.
The movable part 12b was attached to the substrate 4 so as to be parallel to the surface of the substrate 4 at a certain interval.

A tongue-shaped pressing portion 12c is provided near the center of the contact plate 12, and the pressing portion 12c is pressed in the direction of the substrate 4 by a pressing pin 20 provided on the upper plate of the movement. This elastically urges the movable portion 12b in the direction of the contact pins 8 fixed to the substrate 4.

[0007]

In the contact mechanism shown in FIG. 7, a contact pressure cannot be obtained unless the movable portion 2d of the contact plate 2 is bent in advance with respect to the rising portion 2c. There has been a problem that the contact pressure when contacting the contact pins 8 varies due to the variation, the pressing when the contact plate 2 is fixed to the substrate 4, the floating from the substrate 4 when the fixing is performed, and the like.

Also in the contact mechanism shown in FIG. 9, the contact pressure is increased due to floating from the substrate 4, bending of the movable portion 12b, or variation in the height of the holding pin, which occurs when the contact plate 12 is fixed to the substrate 4. There was a problem of variation. In particular, in a mechanism using this contact plate 12,
Since no contact pressure is generated unless the contact plate 12 is pressed by the pressing pins provided on the upper plate or the like, there is a problem that the actual contact pressure cannot be known unless the movement is completed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and ensures contact pressure without subjecting a movable portion of a contact plate to bending, pressing, etc., and facilitates management without variation in contact pressure. The present invention is to provide a contact mechanism of an alarm clock.

[0010]

According to the present invention, there is provided a contact mechanism for an alarm clock, comprising: a fixed contact provided on a substrate; and a fixed contact fixed to the substrate and capable of coming into contact with and separating from the fixed contact in conjunction with the operation of the reference mechanism. A contact plate that elastically deforms the contact plate, wherein the contact plate has a tongue-shaped engaging portion, a movable portion having an open end, and a contact provided on the movable portion. And the substrate has a mounting hole that fits into the engaging portion, the fixed contact comprises a contact pin protruding from the surface of the substrate, and the engaging portion is attached to the mounting hole. The contact plate is attached on the front surface of the substrate by being fitted and engaged with the back surface of the substrate, and the contact portion comes into contact with the contact pin and the movable portion bends, whereby contact pressure is reduced. It is to be set.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A contact plate in a contact mechanism of an alarm clock according to the present invention has a tongue-shaped engaging portion, which is fitted into a mounting hole of a substrate to engage with a back surface of the substrate. By doing so, it is fixed to the substrate. The contact plate fixed to the substrate is provided along the surface of the substrate, and the movable portion is lifted and bent when the contact portion comes into contact with a contact pin protruding above the substrate. Thus, the contact pressure between the contact portion and the contact pin is secured by the elasticity of the curved movable portion. In addition, this contact pressure is caused by bending of the movable part,
That is, since the height is determined by the height of the contact pin, the variation in the contact pressure can be minimized only by managing the height of the contact pin.

[0012]

FIG. 1 is a sectional view showing a contact mechanism of an alarm clock according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an exploded perspective view. Reference numeral 22 denotes a contact plate, which is formed of a thin plate having elasticity, and is formed, for example, by pressing a thin metal plate. This contact plate 22
A window 22c formed by punching while leaving a center of a plane near one end 22a in a tongue shape, and an engaging portion formed by bending a tongue-shaped portion protruding into the window 22c. 22b. The engaging portion 22b has a substantially T-shape in which a tip portion 22d protrudes laterally. A movable portion 22f is provided from the engagement portion 22b to the other end 22e of the contact plate 22 which is released. Further, on a surface of the end portion 22e facing a contact pin on a substrate described later, a contact portion 22g provided with highly conductive plating such as gold is provided.

Reference numeral 24 denotes a substrate on which a conductive pattern or the like is formed on the front and back surfaces, and has a substantially T-shaped mounting hole 24a into which the engaging portion 22b of the contact plate 22 can be fitted. This mounting hole 2
4a is composed of a fitting portion 24c through which the wide end portion 22d of the engaging portion 22b can pass, and a fitting portion 24d adapted to the main body portion 22h having a small width of the engaging portion 22b.

Reference numeral 28 denotes a contact pin as a fixed contact provided on the substrate 24. This contact pin 28 is
A rod-shaped foot 28a that is inserted into the hole or the like and protrudes to the back side of the substrate 24 to connect with a pattern on the substrate with solder or the like and is fixed, and a tip 28b that protrudes above the surface of the substrate 24 And a regulating portion 28c provided between them and having a larger diameter than the foot portion 28a which comes into contact with the surface of the substrate 24 and regulates the height of the tip portion 28b.

Reference numeral 26 denotes a guide mechanism having a structure similar to that of the above-described guide mechanism 6, and includes a guide set wheel 26a and a guide transmission wheel 26b which are rotatably supported concentrically on a shaft 26c, and a guide set that can be detachably mounted. It is composed of convex portions 26d and 26e of the wheel 26a and concave portions 26f and 26g of the guide transmission wheel 26b. In this guide mechanism 26, the guide set vehicle 2
6a and the guide wheel 26b are rotated by the respective rotations.
6 d and 26 e and the recesses 26 f and 26 g are fitted and removed, and the fitting and removal of the guide set wheel 26 a causes the alarm lever 26 h to descend or rise in the axial direction from the hole 24 b of the board 24.

In the contact plate 22 of the contact mechanism having the above-described structure, the engaging portion 22b is fitted into the mounting hole 24a of the substrate 24, and the tip portion 22d is inserted through the fitting portion 24c to go around the back surface of the substrate 24. . At this time, the wide end portion 22d does not fall out of the fitting portion 24d of the mounting hole 24a and engages with the back surface of the substrate 24. Thus, the substrate 2
The contact plate 22 attached to the surface of the substrate 4 is provided on the substrate 24 along the surface of the substrate 24.
In addition, the connection with the pattern on the substrate is intended, and the contact plate 22
Of the engaging portion 22b so that the position of
May be fixed to the back surface of the substrate 24 with solder or the like.

The contact plate 22 attached to the substrate 24 as described above is positioned such that the contact portion 22g of the movable portion 22f abuts on the tip portion 28b of the contact pin 28 projecting above the substrate 24. Therefore, the movable part 2 of the contact plate 22
2f is bent so as to be lifted from the surface of the substrate 24 by the contact pins 28, and is urged by the elasticity generated at this time to come into contact with the contact pins 28 with the set contact pressure.

The contact state between the contact plate 22 and the contact pin 28 as described above is determined by the alarm lever 26h of the guide mechanism 26.
Rises and is released by pushing up the movable part 22f, and when the alarm lever part 26h descends, it comes into contact with the set contact pressure again.

This contact pressure is applied to the movable part 22 of the contact plate 22.
Since f is determined by the amount of movement lifted from the surface of the substrate 24 by the contact pins 28 and bent, the contact pins 28
Of the substrate 24 from the surface thereof. Accordingly, it is possible to set and manage the contact pressure between the contact plate 22 and the contact pins 28 only by setting and managing the height of the contact pins 28.

The engaging portion 22b and the mounting hole 24 necessary for mounting the contact plate 22 to the substrate 24 in the above embodiment are provided.
The condition of the dimension a is as follows. That is, as shown in FIG. 3, the width of the distal end portion 22d of the engaging portion 22b is m1, the width of the main body portion 22h of the engaging portion 22b is T1, and the width from the bent portion of the engaging portion 22b to just before the distal end portion 22d. The length is set to S1, and the width of the fitting portion 24c of the mounting hole 24a is set to m.
2. If the width of the mounting portion 24a is set to T2 and the thickness of the substrate 24 corresponding to the depth of the mounting hole 24a is set to S2, T2 <m1 ≦ m
It is preferable to set the dimensions of each part so that 2, T1 ≦ T2, S1 ≧ S2.

On the other hand, to increase the contact pressure, the contact pins 28
If the contact pressure cannot be further increased or the contact pin 28 cannot be increased, the end 22a of the contact plate 22 may be bent or a spherical projection may be formed here. Increasing the contact pressure of the portion 22a with the substrate 24;
Thereby, the contact pressure can be increased. FIG.
As shown in FIG. 8, the end portion 22a may be bent and inserted into the substrate 24, and the bent portion of the end portion 22a may be fixed with solder or the like instead of the engaging portion 22b.

An end 22e of the contact plate 22, which is a leading end of the movable portion 22f, is divided by providing a slit 22i as shown in FIG.
And each of them is a contact pin 28j,
It is also possible to configure so as to make contact with 28k. With this configuration, the reliability of signal output can be increased.

Further, the engaging portion 22b of the contact plate 22 may have another shape as long as it can be engaged with the substrate 24. For example, the engaging portion 22b may have a shape as shown in FIG. . That is, the engaging portion 22m is formed by bending a portion left in a tongue shape having a uniform width when the window portion 22c is punched into a substantially U-shape. More specifically, the engaging portion 22m includes a main body 22n protruding into the window 22c, a bent portion 22p thereof, and a tip 22q further bent so as to be parallel to the main body 22n.
It is composed of

The mounting holes 24e of the substrate 24 into which the engaging portions 22m are fitted are the same as the mounting holes 24a described above.
Since there is no need to provide the fitting portion 24c having an increased width as in the above, it is only necessary to form the fitting portion 24c in a rectangular shape.

The engaging portion 22m and the mounting pore 24 as described above
In the case of e, the tip end 22q of the engaging portion 22m is attached to the mounting hole 24e.
Into the back side of the substrate 24,
q is engaged with the back surface of the substrate 24 so that the contact plate 22
Is attached to the substrate 24. In this case as well, the substrate 24
The tip 22q of the engaging portion 22m may be fixed to the back surface of the substrate 24 with solder or the like in order to secure the connection with the conductive pattern and prevent the displacement.

The engaging portion 22m and the mounting hole 2
The dimensional condition of each part when 4e is used is as follows. That is, as shown in FIG. 6, the length of the distal end portion 22q of the engaging portion 22m is k1, the width of the main body portion 22n and the like is T1, the height of the bent portion 22p is S1, and the length of the mounting hole 24e is k.
2. If the width is set to T2 and the depth is set to S2, k1 ≦ k2
It is preferable to set T1 ≦ T2 and S1 ≧ S2.

[0027]

According to the present invention, the contact pressure between the contact plate and the contact pin is determined only by the amount of displacement when the contact plate is bent by contact with the contact pin without bending and pressing the contact plate. Therefore, the contact pressure can be set only by the height of the contact pin which is easy to process. in this way,
Since the contact pressure can be set and managed only by setting and managing the height of the contact pin, the variation in the contact pressure can be minimized.

Further, since the contact plate is formed in a strip shape whose basic shape is simple, the amount of material to be carried out during press working can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a contact mechanism of an alarm clock according to one embodiment of the present invention.

FIG. 2 is a plan view of a contact mechanism of the alarm clock shown in FIG.

FIG. 3 is an exploded perspective view of a contact mechanism of the alarm clock shown in FIG. 1;

FIG. 4 is a cross-sectional view showing an example in which an end of the contact plate shown in FIG. 1 is changed.

FIG. 5 is a plan view showing an example in which a contact portion of the contact plate shown in FIG. 1 is changed.

FIG. 6 is an exploded perspective view showing an example in which an engagement portion of the contact plate shown in FIG. 1 is changed.

FIG. 7 is a sectional view showing a contact mechanism of a conventional alarm clock.

8 is a cross-sectional view showing a bent state of the contact plate shown in FIG.

FIG. 9 is a sectional view showing a contact mechanism of another conventional alarm clock.

[Explanation of symbols]

 Reference Signs 22 Contact plate 22b, 22m Engagement part 22f Movable part 24 Board 24a Mounting hole 26 Guide mechanism 28 Contact pin

Claims (1)

[Claims] 1. An alarm clock comprising: a fixed contact provided on a substrate; and a contact plate fixed to the substrate and elastically deformable so as to be able to contact and separate from the fixed contact in conjunction with the operation of a guide mechanism. In the contact mechanism, the contact plate has a tongue-shaped engaging portion, a movable portion having an open end, and a contact portion provided on the movable portion. The fixed contact comprises a contact pin protruding from the front surface of the substrate, and the engaging portion is fitted into the mounting hole and engaged with the back surface of the substrate, whereby A contact mechanism for an alarm clock, wherein a contact plate is provided on a surface of the substrate, and a contact pressure is set by contacting the contact portion with the contact pin and bending the movable portion.