JP4063343B2 - Contact switchgear - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an improvement of a contact switching device in a geared motor or the like having a timer or a switching mechanism used in various control devices.
[0002]
[Prior art]
Japanese Unexamined Patent Publication No. 55-36907 discloses an example in which each switch contact piece is sequentially switched and opened and closed. FIG. 5 is a plan view of an essential part for showing the opening / closing operation.
In FIG. 5, reference numeral 21 denotes a cam, and a step is provided on a part of the cam 21 in the circumferential direction. Reference numerals 22, 23, and 24 are switch contact pieces having elasticity such as leaf springs. The plurality of switch contact pieces are turned on or off by opening and closing each switch contact piece so as to be in sliding contact with the cam 21. It can be switched.
[0003]
More specifically, in the figure, the switch contact pieces 22 and 23 are in a closed state, and in this state, an operation system is operating. As the cam 21 rotates in the direction of the arrow, the switch contact piece 22 falls into a step and the switch contact piece 23 is still caught, so that the switch contact pieces 22 and 23 are opened and the previous operation system is stopped. This time, when the switch contacts 23 and 24 are closed, another operating system is activated. Further, when the cam 21 rotates in the direction of the arrow, the switch contact piece 23 also falls into a step, the switch contact pieces 23 and 24 are opened, and the other operation system described above is stopped, and the switch contact piece 22 is also stopped. And 23 are closed, and the previous operation system is activated. By repeating this, each switch contact piece was switched.
[0004]
[Problems to be solved by the invention]
However, the above configuration has the following problems.
The reason is that noise occurs when the switch contact piece falls from the stepped portion of the cam 21. The switch contact piece is in sliding contact with the outer periphery of the cam 21, and the tension gradually increases as the cam 21 rotates. Power will be generated. When the switch contact piece 22 in such a state falls into the step of the cam 21, the elastic force described above is released, and the impact at that time is generated as noise. This noise is very troublesome for the user, and it is almost impossible to prevent the noise from being generated in such a structure.
[0005]
Further, when the contact opening / closing device is constituted by a cam as in the prior art, since the cam has a step, it is impossible to rotate it in the direction opposite to the arrow in FIG. 4 because each contact piece is caught by the step. Therefore, the design is restricted for the user.
In addition, the cam 21 is troublesome in design and processing, and when used in combination with a gear, the switch opening / closing portion of the switch contact piece and the gear mechanism are configured separately, increasing the number of parts and the structure being complicated. It was.
[0006]
SUMMARY OF THE INVENTION Accordingly, the present invention aims to provide a contact switching device that solves the above-described problems, eliminates the generation of noise, and has a simplified structure.
[0007]
[Means for Solving the Problems]
The contact switching device of the present invention includes a first switch contact piece that is elastically contacted at a predetermined position on the outer periphery of a cylinder having a central axis as a rotation axis, and an axial direction from the predetermined position on the outer periphery of the cylinder. It consists of second and third switch contact pieces operated respectively by the first and second protrusions provided at the displaced positions, and the contact opening / closing operation can be performed by rotating the cylinder in both forward and reverse directions. A contact switching device,
The second switch contact piece elastically contacts the first switch contact piece, the third switch contact piece elastically contacts the second switch contact piece, and the first switch contact piece The first, second and third switch contacts are arranged to overlap,
The first protrusion and the second protrusion are arranged at different positions in the axial direction and the rotation direction,
The first protrusion and the second protrusion are shaped so that the second switch contact piece and the third switch contact piece can slide smoothly, respectively, and the second switch contact piece and the third switch contact piece The open ends of the switch contact pieces are extended outward from the rotation trajectories of the first protrusion and the second protrusion, respectively.
The first, second, and third switch contacts are all conductive when not operated by both protrusions, and the second switch contacts are operated radially outward of the cylinder by the first protrusions. When the second switch contact piece and the third switch contact piece are conducted, the conduction of the first switch contact piece and the second switch contact piece is released, and the second protrusion When the third switch contact piece is operated radially outward of the cylinder, the second switch contact piece and the second switch contact piece are electrically connected to each other. The conduction of the third switch contact piece is released.
Further, it is preferable to form a protrusion escape hole in the first switch contact piece.
[0008]
[Action]
The first switch contact piece is slidably brought into contact with the rotating portion, and the second switch contact piece is brought into contact with the first switch contact piece, and the protrusion corresponding to the second switch contact piece is provided on the rotating portion. By providing, when the second switch contact piece is engaged with the protrusion, the second switch contact piece is lifted along the protrusion so that the first switch contact piece is lifted. Release contact.
[0009]
[First embodiment]
FIG. 1 is a side view of an essential part showing a state in which a switch contact piece is opened in a first embodiment of the present invention, and FIG. 2 is a plan view showing a state in which each switch contact piece is in contact with FIG. FIG. FIG. 3 is a side view showing another open state of the switch contact piece in FIG.
[0010]
In FIG. 1, reference numeral 1 denotes a gear, which is not shown here but is connected to another gear and rotates. Or you may comprise so that the motive power of a motor may be transmitted directly. As shown in FIG. 2, two projections 1a and 1b are formed on the cylindrical shaft portion of the gear 1 configured as the rotating portion at an interval of 180 ° on the circumference. Moreover, the protrusions 1a and 1b are arranged so as to be shifted in the axial direction as shown in FIG. Reference numerals 2, 3, and 4 denote first, second, and third switch contact pieces, respectively. These first, second, and third switch contact pieces are made of an elastic member such as a leaf spring, for example. Yes. And the 1st switch contact piece 2 is distribute | arranged to the center of a cylindrical axial part, and is always made to slidably contact with a cylindrical axial part. Further, the second switch contact piece 3 is provided so that a part thereof is in contact with the first switch contact piece 2 and extends so as to be able to engage with the protrusion 1a. ing. The same applies to the third switch contact piece, and a part of the third switch contact piece is arranged so as to be in contact with the second switch contact piece 3, and this time extends so as to be able to engage with the protrusion 1b. It is provided with the part which did. In forming these extended portions, if the switch contact piece is formed in an approximately L shape, the material is not wasted and the contact pressure is adjusted.
[0011]
A specific opening / closing operation of the contact opening / closing device configured as described above will be described.
First, in the state shown in FIG. 2, the motor is driven by electrical conduction between the first switch contact piece 2 and the second switch contact piece 3, and the gear 1 moves in the direction of the arrow through a direct or indirect transmission path. To be rotated. At the same time, the protrusions 1a and 1b also move. When the protrusion 1a is moved to the state as shown in FIG. 1, the second switch contact piece 3 comes into contact with the second switch contact piece 3 along the protrusion 1a with an elastic force. And gradually lifted. Then, the contact between the first switch contact piece 2 and the second switch contact piece 3 is released in the form shown in FIG. At this time, the electrical continuity is released, the motor is turned off, and the operation stops.
[0012]
At this time, since the second switch contact piece 3 and the third switch contact piece 4 are kept in contact with each other, the second and third switch contact pieces 3 and 4 are electrically connected to each other, so that the motor Is turned on and rotation is started. Then, the 2nd switch contact piece 3 falls smoothly along the protrusion 1a, and returns to the original state. When the switch contacts come into sliding contact with each other, the protrusion 1b and the third switch contact 4 correspond to each other as shown in FIG. The third switch contact piece 4 is lifted along the portion 1b to release the contact. Then, the electrical continuity is released, the motor is turned off, and the operation is stopped. Thereafter, the first switch contact piece 2 and the second switch contact piece 3 are made conductive to repeat the operation thereafter.
[0013]
In such a contact switching device, since the switching of the contact piece is always performed while being in contact, the conventional one has a configuration in which the switch contact piece suddenly falls into the stepped portion due to the influence of the repulsive force. Although it was impossible to prevent the generation of noise due to the impact, it can be eliminated in this embodiment. Moreover, if the open end of the switch contact piece extends outward from the movement locus of the protrusion, in this case, the rotation locus, it is possible to construct forward and reverse rotations that were impossible with the prior art. Therefore, design constraints are reduced for the user, and the degree of freedom in handling is increased.
[0014]
[Second embodiment]
FIGS. 4A and 4B are views showing a contact switching apparatus according to a second embodiment of the present invention, in which FIG. 4A is a side view of an essential part thereof, and FIG. 4B is a perspective view of a switch contact piece.
In FIG. 4, one protrusion 1 c is provided at the center of the cylindrical shaft portion of the gear 1, and contacts the first switch contact piece 2 and the first switch contact piece 2 so as to correspond to the protrusion. In this way, the second switch contact piece 3 is arranged.
Here, as can be seen from FIG. 5B, the first switch contact piece 2 is formed with a substantially rectangular protrusion escape hole 2a. The second switch contact piece 3 is the same as in the above embodiment.
[0015]
The opening / closing operation of the contact opening / closing device having such a configuration will be described.
First, in the state of (a), a rotating operation is performed by electrical conduction between the first switch contact piece 2 and the second switch contact piece. When the protrusion 1c moves to the switch contact piece side, the protrusion 1c enters the protrusion escape hole 2a of the first switch contact piece 2 so that it moves in the hole 2a as it is. become. Then, the first switch contact piece 2 is in sliding contact with the cylindrical shaft portion as it is, but the second switch contact piece 3 is pushed up by the protrusion 1c that has entered the protrusion escape hole 2a. As a result, the contact between the first switch contact piece 2 and the second switch contact piece 3 is released and the operation is stopped.
[0016]
With this configuration, if the number of switch contacts is increased to the third and fourth switch contacts, the switch contact switching operation can be performed in the same manner as in the above embodiment.
In this way, since the axial length of the cylindrical shaft portion can be shortened, the device can be miniaturized.
[0017]
In addition, about the shape of protrusion 1a, 1b, if each switch contact piece is a shape which can slide smoothly, there will be no problem in particular, and when the point is considered, it is desirable to form in spherical shape or curve shape.
Further, in this embodiment, a configuration using a gear as the rotating portion is shown, but it may not be a separate gear, and may be a normal rotating body at all.
Moreover, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.
[0018]
【The invention's effect】
As described above, according to the present invention, any one of the plurality of switch contact pieces is slidably contacted with the rotating portion, and the switch contact pieces that are not slidably contacted with the rotating portion are contacted by overlapping each other. By providing at least one corresponding protrusion, the switch contact piece slides along this protrusion, so that the contact with the opposing switch contact is moved in the opening direction. Noise can be eliminated when opening the contact with the switch contact piece. In addition, since it is only necessary to provide a protrusion on the cylindrical shaft portion, the number of parts can be reduced and the structure can be simplified.
[0019]
Also, if the open end of the switch contact piece corresponding to at least one protrusion is extended outward from the rotation trajectory of the protrusion, it will not be caught even if it is rotated in the reverse direction. Both rotation configurations are possible, the degree of freedom in design is increased, and handling is improved.
In addition, if a protrusion escape hole is formed in the switch contact piece that is in sliding contact with the rotating part, the protruding part moves in this hole to perform opening and closing operations, so the axial length of the rotating part can be shortened. Therefore, it is possible to easily realize downsizing as an apparatus.
[0020]
[Brief description of the drawings]
FIG. 1 is a side view of an essential part showing a state where a switch contact piece is opened in a first embodiment of the present invention.
FIG. 2 is a plan view showing a state where each switch contact piece is in contact with FIG.
FIG. 3 is a side view showing another open state of the switch contact piece in FIG. 1;
FIG. 4 is a view showing a contact switching apparatus according to a second embodiment of the present invention.
FIG. 5 is a plan view showing a conventional contact switching device.
[Explanation of symbols]
1, 21... Rotating parts 1a, 1b, 1c ... Projections 2, 22 ... First switch contact piece 2a ... Projection relief holes 3, 23 ... Second switch contact pieces 4, 24 ... Third switch contact

Claims (1)

A first switch contact piece having elasticity at a predetermined position on the outer periphery of the cylinder having the central axis as a rotation axis and always in contact with the first switch piece is provided on the outer periphery of the cylinder at a position displaced in the axial direction from the predetermined position on the outer periphery. A contact opening and closing device comprising a second and third switch contact pieces operated respectively at the first and second protrusions, and capable of performing a contact opening and closing operation by rotating the cylinder in both forward and reverse directions;
The second switch contact piece elastically contacts the first switch contact piece, the third switch contact piece elastically contacts the second switch contact piece, and the first switch contact piece The first, second and third switch contacts are arranged to overlap,
The first protrusion and the second protrusion are arranged at different positions in the axial direction and the rotation direction,
The first protrusion and the second protrusion are shaped so that the second switch contact piece and the third switch contact piece can slide smoothly, respectively, and the second switch contact piece and the third switch contact piece The open ends of the switch contact pieces are extended outward from the rotation trajectories of the first protrusion and the second protrusion, respectively.
The first, second, and third switch contacts are all conductive when not operated by both protrusions, and the second switch contacts are operated radially outward of the cylinder by the first protrusions. When the second switch contact piece and the third switch contact piece are conducted, the conduction of the first switch contact piece and the second switch contact piece is released, and the second protrusion When the third switch contact piece is operated radially outward of the cylinder, the second switch contact piece and the second switch contact piece are electrically connected to each other. A contact opening / closing device in which the conduction of the third switch contact piece is released.

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