JPH048580Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to switch devices used in control panels of power plants and various nuclear facilities. The structure allows the handle shaft to rotate when the pushbutton shaft is pushed in, giving the meaning of "pointing and calling" to the pushing of the pushbutton shaft, preventing erroneous operation, and preventing the switch from accidentally touching the operating handle. This relates to a switch device that does not operate.

[Prior Art] Many switch devices are installed in parallel in control panels of power plants and various nuclear facilities. This type of switch device has an operating handle attached to the upper end of a handle shaft rotatably supported by a housing, and a switch operating cam attached to the lower end, and the cam moves as the handle shaft rotates to open and close the contacts. Many mechanisms are used to do this.

For example, the cam and contact point for normally operating the switch are separated, and when the handle shaft is rotated by the operating handle, the cam and the contact point come into contact, and a solenoid valve or the like is operated.

[Problems to be solved by the invention] In the conventional switch device as described above, the switch contacts are connected and separated only by operating the handle. This prevents erroneous operation by pointing and calling out the contents of the switch operation to the switch. However, there is no interlocking relationship between pointing and calling and switch actions. Therefore, even if the user neglects to point and call, it is possible to rotate the operating handle and operate the switch, which may lead to erroneous operation.

Furthermore, some switch devices do not have a lock function that prevents them from being operated, and in such cases, the switch may turn on or off by inadvertently touching the operating handle.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, provide a lock mechanism on the switch operating handle shaft, give the meaning of pointing and calling to the specific operation of the operator pushing the push button, and To provide a highly reliable switch device which prevents erroneous operation by preventing a lock mechanism from being released unless operated.

[Means for Solving the Problems] The present invention is based on a switch device having a structure in which a switch operating portion is provided on a rotatably supported handle shaft, and the switch is turned on or off by rotation of the handle shaft. That is.

In order to achieve the above object, the present invention includes a push button shaft that is movable in the axial direction and is arranged in parallel with the handle shaft, and a notch for accommodating a ratchet and a notch for accommodating a presser claw are formed in the push button shaft. For these, a ratchet is attached to the housing side and a presser claw is attached to the handle shaft side, and the push button shaft is held in a predetermined position by engagement with the ratchet when it is pushed in, and in this state, the presser claw is This is a switch device which has a function to prevent erroneous operation and is constructed so that it can be inserted into the notch for housing the presser claw and rotation of the handle shaft is permitted.

[Operation] In the normal state before the push button shaft is pushed in, even if an attempt is made to rotate the handle shaft, the presser claw interferes with the push button shaft, so the handle shaft cannot be rotated and remains locked.

During operation, push the pushbutton shaft in the same way as the traditional pointing and calling motion. As a result, the ratchet resiliently repelled by the spring enters the ratchet accommodating notch, and the push button shaft is held in the pressed state. The position of the pushbutton shaft is at a level where the presser pawl accommodation notch formed on it matches the position of the presser pawl, so the presser pawl can enter and rotation of the operating handle is permitted. Become. At this time, the switch can be turned on or off by moving the operating handle and rotating the switch operating section.

Therefore, even if you try to move the handle shaft under normal conditions, it is locked, so even if you touch the operating handle by mistake, the switch will not operate, and you will not be able to operate the switch unless you press the push button, so erroneous operation can be prevented.

[Embodiment] FIGS. 1 to 3 are perspective views showing an embodiment of the erroneous operation prevention switch device according to the present invention.

A handle shaft 14 is provided so as to pass through the upper plate 10 and lower plate 12 of the housing, and an operating handle 16 is attached to the upper end of the handle shaft 14.
A switch operating cam 18 is provided at the lower end as a switch operating section. The handle shaft 14 is rotatable and held movably in the axial direction. A contact (not shown) is located near the switch operating cam 18, and as the cam 18 rotates, the contact opens and closes.

Now, in the present invention, the push button shaft 20 is located parallel to the handle shaft 14, and the upper plate 10 and the lower plate 12
is held so as to be movable in the axial direction. The push button shaft 20 has a groove 22 formed therein and a pin 2 that fits into the groove 22 through the upper plate 10.
Rotation is restricted from 4. Push button shaft 20
A tension spring 26 is provided between the lower end and the lower plate 12, and a notch 28 for accommodating a ratchet is provided above the intermediate portion, and a notch 30 for accommodating a presser claw is provided below that. .

An inverted L-shaped ratchet 32 is pivotally connected to the housing side by a pin 34, and a ratchet spring 36 is attached to it.
is attached, and the lower end of the long side of the ratchet 32 is urged to rotate in the direction of the push button shaft 20.

A striker 40 is provided on the handle shaft 14 and has an inclined surface that slides against the short side of the ratchet 32. In addition, a presser claw 42 and a rotation stopper 4 are provided below.
A claw member 46 having a number 4 is fixed. A handle return spring presser bar 48 is provided upright on the claw member 44, and a detent prevention bar 5 is provided on the lower plate 12.
A handle return rotation spring 52 is attached between the handlebar and the handlebar. A compression spring 54 is also provided between the lower end of the handle 14 and the lower plate 12.

The operation of the present switch device configured as described above is as follows. First, FIG. 1 shows the state before operation. In this state, even if you try to rotate the handle shaft 14 with the operating handle 16, the claw member 44 attached to the handle shaft 14 will not rotate.
The operating handle 16 cannot be turned because the presser claw 4 interferes with the push button shaft 20. Therefore, even if the user accidentally touches the operating handle or attempts to turn only the operating handle 16, the switch will not operate.

When performing a switch operation, first push the push button shaft 20 as shown in FIG. Then, the ratchet 32 is rotated by the force of the ratchet spring 36 and enters the ratchet accommodating notch 28 formed in the push button shaft 20. As a result, the tension spring 2 is attached to the push button shaft 20.
6 is attached, it is held in the lowered position by engagement with the ratchet 32. In this state, the presser pawl 42 is at the same level as the pawl accommodating notch 30 of the push button shaft 20, so it does not interfere with the push button shaft 20 and the operating handle 16 can be rotated.
Therefore, when the handle shaft 14 rotates in this state,
Switch operating cam 1 provided below
8 comes into contact with a contact point, and for example, a solenoid valve or the like is operated.

The striker 40, which has a disc shape with one half inclined, has the function of returning the ratchet 32 to its original state.When the operating handle 16 is turned in the ON direction as shown in FIG. It is pushed up along the slope of the striker 40,
It comes off from the ratchet accommodating notch 28 of the push button shaft 20. However, in this state, the handle shaft 1
4 is in a tight state, and the presser claw 42 is fitted into the presser claw housing notch 30 of the push button shaft 20, whereby the push button shaft 20
is prevented from rising. The handle shaft 14 receives the force of the handle return rotation spring 52, and the presser claw 42 slides on the end face of the presser claw housing notch 30 to return to the state before operation, and the pushbutton shaft 20 rises to its original position. Return.

If the handle shaft 14 is turned too much and the presser claw 42 comes off from the presser claw housing notch 30, the push button shaft 20 will rise and the handle shaft 14 will be removed.
It becomes impossible to return it to its original position. The rotation stopper 44 prevents this. The above-mentioned problem is solved by limiting the rotation angle of the handle shaft 14 so that the rotation stop 44 can only be rotated until it comes into contact with the anti-rotation rod 50.

Now, even though the push button shaft 20 has been pushed in, if it is no longer necessary to operate the handle shaft 14, the push button shaft 20 must be able to be returned to its original position. In this embodiment, the handle shaft 1
Since the striker 4 is movable in the axial direction, by lifting it, the upper surface of the striker 40 comes into contact with the lower end of the short side of the ratchet 32, and the ratchet 32 is pushed up and removed from the ratchet accommodating notch 28. Push button shaft 20 to remove
can be returned to its original position. Furthermore, the pulled-up handle shaft 14 is pushed down by the compression spring 54 and returns to its original position, resulting in the state shown in FIG.

Since it has a lock function under normal conditions, unless the pushbutton shaft 20 is pressed, the handle shaft 1
4, but if you need to operate the steering wheel urgently, do the following: If the handle shaft 14 is slightly pulled up from the state shown in FIG.
The presser pawl 42 no longer interferes with the push button shaft 20, making it possible to operate the handle in an emergency. The handle shaft 14, which has been pulled up and twisted, returns to its original position by the compression spring 54 and the handle return rotation spring 52, resulting in the state shown in FIG.

Although a preferred embodiment of the present invention and its operation have been described above, it goes without saying that the present invention is not limited to only such a configuration. In the above embodiment, one push button shaft is provided for one handle shaft, but the push button shafts are provided on both sides of the handle shaft, and the intermediate position between the two push button shafts is predetermined as the return state. ,
The handle shaft may be structured so that it can be rotated only in the direction of one of the push button shafts that is pressed. It goes without saying that the shape of each other member, its formation position, attachment position, etc. can be changed as appropriate depending on the manner of use.

In addition, in the embodiment, the switch actuating part is made up of the switch actuating cam 18, but the type of the switch actuating part is not limited to this. For example, a certain portion of the handle shaft may have a structure or a combination of materials capable of operating the proximity switch, and the proximity switch may be turned on or off by rotation of the handle shaft.

[Effects of the invention] As mentioned above, this invention has a push button shaft arranged in parallel to the handle shaft where the switch actuating part is provided, and in combination with a ratchet and presser pawl, the push button shaft is normally pressed only when the push button shaft is pushed in. Because the handle is structured to be operable, it has a lock function that prevents the handle shaft from rotating even if the handle is accidentally touched, and the operator is forced to push the push button shaft during operation. Since the switch cannot be operated unless it is done, it can have the same meaning as the conventional pointing and calling, which has the effect of preventing erroneous operations and improving safety.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the normal state of an embodiment of the erroneous operation prevention switch device according to the present invention, Fig. 2 is a perspective view showing the push button shaft in a pressed state, and Fig. 3 is a perspective view showing the push button shaft in the depressed state. FIG. 3 is a perspective view showing a state when the push handle shaft is rotated. 14...handle shaft, 16...operation handle,
18...Switch operating cam, 20...Push button shaft, 28...Ratchet housing notch, 3
0...notch for accommodating presser claw, 32...ratchet, 40...striker, 42...presser claw.

Claims (1)

[Scope of utility model registration request] In a switch device in which a switch actuating part is provided on a rotatable handle shaft, and the switch is turned on or off by the rotation thereof, a push button shaft movable in the axial direction is arranged parallel to the handle shaft, and the push button shaft is movable in the axial direction. A notch for accommodating a ratchet and a notch for accommodating a presser pawl are formed, and a ratchet is attached to the housing side, a presser pawl is attached to the handle shaft side, and the push button shaft is engaged with the ratchet when pushed in. An erroneous operation prevention switch device that is held in a predetermined position by the handle, and in that state, the presser pawl can enter the presser pawl housing notch, allowing rotation of the handle shaft.