JPH0537375Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention relates to a structure for mounting a pointer provided on a switch to indicate "on" and "off".

(Prior Art) Conventionally, a pointer that indicates "on" or "off" of a switch is fixed to a pointer shaft that rotates in direct connection with the opening/closing operation mechanism of the switch.

(Problem that the invention aims to solve) However, when installing the switch on a pole, if the pointer is touched by another object due to carelessness or is subjected to impact, the pointer may be damaged or bent. Furthermore, if a foreign object gets caught on the pointer during the closing or opening operation of the opening/closing operation mechanism, there is a risk that the opening/closing operation may be interrupted or the operation may become impossible. There is.

On the other hand, if an excessive force is applied to the pointer, the opening/closing operation mechanism may be driven by the pointer, and the movable electrode of the switch may move.

This idea was devised in view of the above-mentioned problems, and its purpose is that even if an external force is applied to the pointer attached to the pointer shaft, the pointer shaft connected to the opening/closing operation mechanism will not be affected by the external force. It is an object of the present invention to provide a pointer mounting structure for a switch which does not have the influence of the above, has a simple structure with a small number of parts, and can be easily assembled.

Structure of the invention (means for solving the problem) In order to achieve the above object, this invention has a pointer rotatably inserted loosely into a pointer shaft that rotates in conjunction with closing and opening of the switch, and The pointer shaft is provided with a support portion in the diametrical direction of the pointer shaft, and the pointer is provided with a latch portion at a predetermined distance from the support portion of the pointer shaft in the longitudinal direction. The gist is that one end of a linking member having a linking member is detachably fixed, and the other end of the linking member is detachably fixed to the support portion.

(Function) With the above configuration, not only is the rotation of the pointer shaft reliably transmitted to the display operation of the pointer, but even if a load such as an impact is applied to the pointer, the pointer resists the biasing force of the coil spring and absorbs the load. The display rotates in this direction independently of the pointer shaft, and when the load is removed, the biasing force of the coil spring returns to the original state, that is, the display state that matches the rotational position of the pointer shaft.

(Embodiment) An embodiment embodying this invention will be described below with reference to FIGS. 1 to 4.

A bearing fitting 2 is fixed to the bottom wall of the switch case 1, passing through the inside and outside. A pointer shaft 3 is rotatably supported on the coaxial bearing fitting 2, and a driven lever 4 is fixed to the inner end thereof. Note that 5 and 6 are bearing metals fitted into both the inner and outer ends of the bearing fitting 2;
Reference numeral 7 designates a plurality of O-rings fitted around the outer peripheral surface of the pointer shaft 3.

A pointer 8 is attached to the outer end of the pointer shaft 3 so as to be orthogonal thereto. The pointer 8 has a mounting portion 9 provided at its base end shaped like a square tube. and,
The pointer 8 has a pair of mounting holes 10 formed through the opposing mounting surfaces of the mounting portion 9, and is rotatably inserted into the pointer shaft 3 through the mounting holes 10. Furthermore, the pointer 8 is fitted with a washer spring 11 against the outer end surface of the pointer shaft 3 exposed from the mounting hole 10.
The bolt 12 screwed into the needle shaft 3 prevents it from coming off the pointer shaft 3.

On the outer end circumferential surface of the pointer shaft 3 in the mounting portion 9, a flat abutment portion 3a is provided on the proximal side of the pointer 8, and the abutment portion 3a and
A through hole 13 is provided between the 180 degrees opposite side surface. A support shaft 14 serving as a support portion is inserted into the through hole 13 of the pointer shaft 3 from a side 180 degrees opposite to the contact portion 3a, and a locking stepped portion 14a provided on its head is inserted from the side opposite to the contact portion 3a. It is fastened and fixed by a nut 15 that is screwed into a screw 14b provided at the tip.

At the tip of the pointer 8, a latching protrusion 16 is provided as a latching portion on the inner surface of the switch case 1 side. One end of the coil spring 17 as a linking member having elasticity is latched to the latching protrusion 16, and the other end is screwed into a threaded portion 14c carved on the outer periphery of the head of the support shaft 14. It is attached by. The coil spring 17 is such that its biasing force always acts in the direction of pulling the latch projection 16 toward the support shaft 14 along the direction in which the pointer 8 is attached to the support shaft 14 and the pointer shaft 3.

Inside the switch case 1 is a drive shaft 18 that is rotated to open and close by a switch opening/closing operation mechanism (not shown).
is supported, and a drive lever 20 is provided protrudingly to engage in a groove 19 cut into the end face of the driven lever 4 of the pointer shaft 3.

That is, when the drive shaft 18 is rotated in the direction of the arrow (the closing rotation direction) as shown in FIG. As the driven lever 4 rotates, the pointer shaft 3 rotates in the direction of arrow P shown in FIG.

Further, when the pointer shaft 3 rotates in the direction opposite to the arrow in FIG. 3 (opening rotation direction), the pointer shaft 3 rotates in the direction opposite to the arrow P in FIG. 2 via the driving lever 20 and the driven lever 4.

Now, the operation of the switch pointer mounting structure constructed as above will be explained.

Now, with the pointer 8 indicating "off" as shown in FIG. 2, the drive shaft 18 is switched to the third
As shown in the figure, when the drive lever 20 is rotated in the direction of the arrow (the closing rotation direction), the drive lever 20 is also rotated in the same direction. When the drive lever 20 is rotated in the same direction, the driven lever 4 linked to the drive lever 20 is rotated, and the pointer shaft 3 is rotated in the direction of arrow P shown in FIG. Then, as the pointer shaft 3 rotates, the support shaft 14 also rotates in the same direction, and the coil spring 17
are also rotated in the same direction following the support shaft 14.
At this time, when the coil spring 17 rotates, it stretches slightly against its own biasing force, but the biasing force immediately pulls the latch protrusion 16 at one end in the direction of rotation, and as a result, the pointer 8 The pointer 8 is rotated about the pointer shaft 3 and displays "on".

Further, when the drive shaft 18 is rotated in the opposite arrow direction (opening rotation direction) in FIG. The pointer shaft 3 is connected to the second
It is rotated in the opposite direction of the arrow P in the figure. Then, as the pointer shaft 3 rotates, the support shaft 14 and the coil spring 17 are also rotated in the same direction as described above. As a result, the pointer 8, which is connected to the coil spring 17 via the latch projection 16, is rotated about the pointer shaft 3, and the pointer 8 displays "off".

If an object collides with the pointer 8, the fourth
As shown in the figure, the pointer 8 rotates around the pointer shaft 3 against the biasing force of the coil spring 17, but since the pointer 8 is loosely inserted into the pointer shaft 3, the pointer 8 rotates around the pointer shaft 3.
will not rotate due to the impact of this object.

Then, when the pressing force of the object on the pointer 8 is released, the pointer 8 rotates back to its original position due to the biasing force of the coil spring 17, and again faces in a fixed direction along the mounting direction of the support shaft 14.

Therefore, if an object touches or collides with the pointer 8, the pointer 8 will rotate freely to avoid the pointer shaft 3 as described above, so the pointer 8 may be bent or damaged. Moreover, no external force is applied to the pointer shaft 3, and no driving force is applied to the drive shaft 18 of the opening/closing mechanism for opening/closing.

Further, even if an object gets caught on the pointer 8 while the opening/closing operation mechanism is being opened/closed, the opening/closing operation will not be interrupted or become inoperable.

Moreover, one end of the coil spring 17 is attached to the latching protrusion 16.
Since it is only necessary to hook the other end to the threaded portion 14c of the support shaft 14 and arrange it along the longitudinal direction of the pointer 8, it is easy to assemble, and the hooking protrusion 16 Since it has a simple structure of simply attaching both ends of the coil spring 17 to the threaded portion 14c, the number of parts can be reduced, and the biasing force can be varied as necessary regardless of the diameter of the pointer shaft 3. The coil spring 17 can be freely selected.

Note that this invention is not limited to the above-mentioned embodiment. For example, in the structure of the above-mentioned embodiment, the support shaft 14
is omitted and the other end of the coil spring 17 is connected directly to the pointer shaft 3.
It is also possible to make arbitrary changes without departing from the spirit of this invention, such as by attaching the outer circumferential portion of the device to the support portion as a support portion.

Effects of the invention As detailed above, this invention prevents the pointer from being damaged if the pointer is touched by something else due to carelessness or is subjected to impact when installing the switch on a pole. , the song won't be sluggish,
Further, during the closing or opening operation of the opening/closing operation mechanism,
If an object gets caught in the pointer, there is no risk that the closing/opening operation will be interrupted or rendered inoperable.Furthermore, if excessive force is applied to the pointer, the opening/closing operation mechanism will be driven by this pointer, and the opening/closing operation will be stopped. There is no risk that the movable electrode of the device will move, and all that is required is to fix both ends of the elastic linking member to the hook and the support and place it along the longitudinal direction of the pointer.
In addition to being easy to assemble, it has a simple structure in which both ends of the linking member are attached to the hooking part and the supporting part, so the number of parts can be reduced, and the pointer shaft can be easily assembled. This is an excellent idea for industrial use because it is possible to freely select linking members with different biasing forces as needed, regardless of the diameter.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a pointer structure of an embodiment embodying this idea, Fig. 2 is a sectional view of the main part, and Fig.
The figure is also a front sectional view, and FIG. 4 is an explanatory view of a state in which an external force is applied to the pointer. 1... Switch case, 2... Bearing fitting, 3...
Pointer shaft, 4... Driven lever, 8... Pointer, 9...
Mounting part, 10...Mounting hole, 13...Through hole, 14
. . . Support shaft as a support portion, 16 . . . A latching protrusion as a latching portion, 17 .

Claims (1)

[Scope of claim for utility model registration] Pointer shaft 3 that rotates in conjunction with closing and opening of the switch
A pointer 8 is rotatably inserted loosely into the pointer shaft 3, and the pointer shaft 3 is provided with a support portion 14 in the diametrical direction of the pointer shaft 3; A hooking portion 16 is provided at a predetermined distance apart, and a linking member 17 having elasticity with respect to the hooking portion 16 is provided.
A pointer mounting structure for a switch, characterized in that one end of the linking member 17 is detachably fixed, and the other end of the linking member 17 is detachably fixed to the support portion 14.