JPS623861Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a switch mechanism, and more specifically, a rotary contact mechanism is rotated by a lever rotatably supported on a shaft, and the contact is switched according to the rotation angle. The present invention relates to a switch mechanism configured as described above, in which the switching position of the contact point can be clearly identified at the operating end of the lever.

For example, in industrial instruments, when increasing or decreasing a manual operation signal, it is required to be able to set two speeds: a slow speed that takes about 100 seconds to change the full stroke, and a rapid speed that takes about 6 seconds to change the full stroke. ing. Further, in a state where no manual operation is performed, the operation signal must maintain the set value before the operation without changing. That is, it is desirable that the changeover switch be capable of setting five positions: "neutral→slow increase→sudden increase" and "neutral→slow decrease→sudden decrease."

Conventionally, such switches have been used, for example, lever-swivel switches with leaf spring contacts.
It has the disadvantage that it is difficult to identify the switching position of the "sudden decrease" contact at the lever operating end.Also, since the switch is a combination of leaf spring contacts, it also requires a considerable amount of wiring work.

The present invention solves these drawbacks and will be described in detail below with reference to the drawings.

FIG. 1 is a partially sectional side view showing an embodiment of the present invention, and FIG. 2 is a plan view of FIG. 1. In the drawings, 1 is a lever, 2 is a first pressing mechanism, 3 is a rotating contact mechanism, 4 is a second pressing mechanism, 5 is a base, 6 is a shaft, and 7 is a stopper.

The lever 1 is rotatably supported by a shaft 6 implanted in a base 5, and has a kerf 11 at its free end 1a. The first pressing mechanism 2 includes a lever 1
The lever 1 is engaged with the lever 1 so as to apply a pressing force opposing the rotating direction. In this embodiment, the pressing mechanism 2 is constructed using two symmetrically formed leaf springs. That is, one end 2a of the leaf spring is bent into a U-shape, and one side 2a' thereof is further bent into an L-shape and fixed to the base 5, and the other end 2b is bent into a V-shape. The bent protrusions are arranged so as to press against the side surface of the free end 1a of the lever 1, respectively. Rotating contact mechanism 3
is engaged with the lever 1 so as to rotate according to the rotation of the lever 1, and is configured to switch the contact point according to the rotation angle. In this embodiment, an example is shown in which a holder 31, a wheel 32, printed wiring boards 33, 35, a pin 34, a brush 36, etc. are included. That is, the holder 31 has a storage section formed on one side to rotatably accommodate the wheel 32, and the other side has a through hole for inserting the shaft 32a of the wheel 32, and a hole corresponding to the rotation range of the lever 1. A notch and the like for rotating the wheel 32 are formed. Further, a second spring mechanism 4 is disposed in engagement with the side surface of the holder 31. A circular printed wiring board 33 is fitted onto one surface of the wheel 32 and is covered with a conductive pattern (not shown) so as to form a predetermined contact point depending on the rotation angle. Further, on the other surface of the wheel 32, a shaft 32a is formed to be inserted into the through hole of the holder 31 as described above, and a pin 34 is formed so as to engage with the cut groove 11 of the free end 19 of the lever 1. has been planted. Furthermore, the wheel 32
A part of the outer periphery of the wheel 32 is formed so as to correspond to a predetermined rotation angle of the wheel 32, that is, a predetermined rotation angle α of the lever 1, centered on the diametrical position of the implanted position of the pin 34. A fan-shaped cutout 32b is formed. A plurality of brushes 36 are planted on the printed wiring board 35 so as to slide on predetermined contact portions of the printed wiring board 33, and conductive patterns and connectors are provided for connecting the brushes 36 to an external circuit. However, it is not shown. Note that the printed wiring board 35 is fixed to the base 5. As a result, a rotating contact mechanism is configured between printed wiring boards 33 and 35.
The second pressing mechanism 4 is arranged such that the rotation angle of the rotary contact mechanism 3, that is, the rotation angle of the lever 1 is a predetermined angle α.
The contact mechanism 3 is engaged with the rotating contact mechanism 3 so that the pressing force on the rotating contact mechanism 3 changes when the pressure is exceeded. In this embodiment, a through hole is provided in the side surface of the holder 31 constituting the rotating contact mechanism 3 so that the wheel 3
A ball 41 is rotatably inserted so as to be in contact with the second sector-shaped notch 32b, and a leaf spring 42 is attached to press the ball 41. The stopper 7 is for regulating the lever 1 so that the initial position when the lever 1 is not operated can always be reproduced at a constant position. That is, in this embodiment, a metal piece whose one end 7a is bent into an L-shape is used, and the metal piece is attached to the holder 31 with the L-shaped bent portion located between the opposing ends 26 of the leaf springs 2. . As a result, the pressing force exerted on the lever 1 by the first pressing mechanism 2 becomes zero when the lever 1 is not operated, and the initial position is maintained at a constant position.

The operation of the switch mechanism configured in this way will be explained.

In a "neutral" state in which the lever 1 is not operated, the pressing force on the lever 1 by the first pressing mechanism 2 is approximately equal, so the pin 34 is located approximately on the center line of the lever 1. In the “slow increase” or “slow decrease” state in which the lever 1 is rotated within the angle α, the pressing force on the wheel 32 by the second pressing mechanism 4 is relatively small because it acts on the fan-shaped notch 32b. The pressing force of the first pressing mechanism 2 is small, and the pressing force of the first pressing mechanism 2 is dominant in the rotational operation of the lever 1.
“Sudden increase” in which lever 1 is rotated beyond angle α
Or in a state of "sudden decrease", the second pressing mechanism 4
The pressing force on the wheel 32 due to this will act on parts other than the notch 32b, and will give a clear change to the rotational operating force of the lever 1. Here, since the rotation angle of the lever 1, that is, the rotation angle of the rotary contact mechanism 3, and the switching of the contact point are correlated, the switching position of the contact point can be clearly identified by the operating end of the lever 1.

Further, according to the present invention, since the switch mechanism is constructed using a printed wiring board, connection with an external circuit can be made via a connector, and the wiring work can be simplified.

In the above embodiment, an example of a 5-position switch that rotates the lever both clockwise and counterclockwise around the "neutral" state was explained, but a 3-position switch that rotates the lever in either direction may also be used. Needless to say, it is applicable.

Further, in the above embodiment, an example is shown in which a plate spring is used as the first pressing mechanism and a plate spring is used as the second pressing mechanism to press the ball, but a coil spring may also be used.

In addition, the object to which the brush of the contact part of the rotating contact mechanism is attached is not limited to the printed wiring board.
It may also be a molded member.

Further, the stopper is not necessarily necessary when the range of the "neutral" state can be set widely, and can be omitted as appropriate.

As described above, according to the present invention, it is possible to realize a switch mechanism in which the switching position of the contact point can be clearly identified at the operating end of the lever, and is suitable for use as a switch for manually operated signals in industrial instruments.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing an embodiment of the present invention, and FIG. 2 is a plan view of FIG. 1. 1... Lever, 2... Rotating contact mechanism (first),
3... Rotating contact mechanism, 31... Holder, 32...
Wheel, 33, 35...Printed wiring board, 34
... Pin, 36 ... Brush, 4 ... Pressing mechanism, 5
...base, 6...shaft, 7...stopper.

Claims (1)

[Scope of utility model registration request] a lever rotatably supported on a shaft; a first pressing mechanism engaged with the lever so as to apply a pressing force opposing the rotation direction to the lever; A rotating contact mechanism configured to engage with a lever and switch the contact according to the rotation angle thereof, and a rotating contact mechanism configured to change the pressing force on the rotating contact mechanism when the rotation angle of the rotating contact mechanism exceeds a predetermined angle. A switch mechanism comprising a second pressing mechanism engaged with a rotating contact mechanism.