JPH0721874A - Pendant switch - Google Patents

Abstract

PURPOSE:To easily judge from the appearance which pushbutton of a holding type switch is pressed, and improve working efficiency by engaging a pushbutton cap with the contact surface of the pushbutton of the holding type switch by an engaging member having a simple structure. CONSTITUTION:The engaged state between a pushbutton cap 1 and the contact surface of the pushbutton 4 of a holding type switch 3 is held by engaging members 2, 5. The height of the pushbutton cap on the pressed pushbutton side is lowered, and which pushbutton of the holding type switch is pressed can be thus easily judged from the appearance. Since the engaging members 2, 5 arranged on the pushbutton cap 1 and the contact surface of the pushbutton 4 of the holding type switch 3 are engageable and disengageable, the engaged state between the pushbutton cap 1 and the contact surface of the pushbutton 4 of the holding type switch 3 is released at replacing the holding type switch 3 which is expendables, and only the holding type switch can be easily replaced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pendant switch having a holding type switch or a non-holding type switch.

[0002]

2. Description of the Related Art A pendant switch used for operating a hoist crane is selectively provided with a holding type switch and a non-holding type switch depending on the application. Since the switch is a consumable item, it is usually replaceably attached to the pendant switch case with a screw or the like. And, this holding type switch or non-holding type switch is waterproof, moisture proof,
As shown in FIGS. 6 and 7, the push-button caps 1 and 21 made of a flexible material provided on the pendant switch cases 6 and 26 via the attachment rings 7 and 27 having a closed structure are pushed down for the purpose of dust prevention and the like. The push button 4 or 24 of the holding type switch 3 or the non-holding type switch 23 is indirectly operated by the operation.

Of these, the holding type switch is provided with two push buttons 4 on a main body block 3a as shown in FIG. 6, and when one of the two push buttons 4 is pushed down, the push state is lowered. (1) Power on / off operation (2) Interlocking operation of two hoist / cranes, single-action switching (3) Operating two hoist / cranes Selection of a specific hoist / crane at the time (4) Switching between main winding operation and auxiliary winding operation (5) It is used for turning on / off the lighting, etc. In the pendant switch having the conventional structure, since the push button 4 of the holding type switch 3 is covered with the push button cap 1 and is not exposed on the surface of the pendant switch case 6, any one of the two push buttons 4 is pushed down. What is the appearance Since it is not possible to check, etc., and it is unavoidable to determine which push button is pressed down by tactile sensation, especially in the case of a pendant switch having a plurality of holding type switches, work efficiency is reduced and It was also a factor that caused operational mistakes.

On the other hand, the non-holding type switch is provided with two push buttons 24 in the main body block 23a, and when one of the two push buttons 24 is pushed down and then the push button is released, the push state is changed. It is configured to be released, and is used for (1) hoist and crane hoisting and unwinding operations (2) hoist and crane traverse operations (3) hoist and crane traveling operations, etc. However, in the conventional pendant switch having the non-holding type switch, the push button of the non-holding type switch is covered with the push button cap and is not exposed on the surface of the pendant switch case, like the holding type switch. Therefore, as shown in FIG. 7, even if the push button is locked in a depressed state due to a failure of the non-holding type switch, it cannot be confirmed from the appearance. The cause of failure of other non-holding type switches, for example, welding of electromagnetic contactor, contact of cables, etc., cannot be determined promptly and appropriate action cannot be taken promptly, which may cause a serious accident. there were.

[0005]

SUMMARY OF THE INVENTION In view of the above problems of the conventional pendant switch, the present invention provides a pendant switch capable of discriminating, from the appearance, a push button of a holding type switch or a non-holding type switch. The purpose is to do.

[0006]

To achieve the above object, the pendant switch according to the first aspect of the present invention has a push button cap made of a flexible material and an engaging member arranged on the contact surface of the push button of the holding type switch. The gist is that the contact surface between the push button cap and the push button of the holding type switch can be engaged and disengaged.

In the pendant switch of the second aspect of the present invention, an engaging member is disposed on the contact surface of the push button cap made of a flexible material and the push button of the non-holding type switch, and the push button cap and the non-holding type switch are arranged. The gist is that the contact surface of the push button of the switch can be engaged and disengaged.

[0008]

According to the pendant switch of the first aspect of the present invention, which push button of the holding type switch is pushed down by engaging the push button cap and the contact surface of the push button of the holding type switch with the engaging member. Can be easily distinguished from the appearance.

According to the pendant switch of the second aspect of the present invention, the contact surface of the push button cap and the push button of the non-holding type switch is engaged by the engaging member so that the non-holding type switch is pushed down by a failure. It is possible to easily distinguish the locked push button from the appearance. Further, since the push button cap has a restoring force by itself, the push button of the non-holding type switch can be returned to the non-pushed-down position even if the return spring of the push button of the non-holding type switch is omitted. When a return spring is provided, the push button of the non-holding type switch can return the push button of the non-holding type switch to the non-pushed down position by the double structure of the restoring force of the push button cap and the return spring. Even if the push button cap or the return spring is damaged, the push button of the non-holding type switch can be returned to the non-pushed-down position.

Further, according to the pendant switch of the first invention or the second invention, the engaging member disposed on the contact surface of the push button cap and the push button of the holding type switch or the non-holding type switch is detachable. Therefore, when exchanging the holding type switch or non-holding type switch, which is a consumable item, the engagement state of the push button cap and the contact surface of the holding button of the holding type switch or the non-holding type switch is released, and the holding type switch or Only non-holding switches can be replaced. Also, since the push button cap is held in a state of being engaged with the contact surface of the push button of the holding type switch or the non-holding type switch, the rigidity of the push button cap increases, and the display section fitted on the surface of the push button cap comes off due to impact. Can be prevented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments. 1 to 3 show a first embodiment of a pendant switch according to the present invention, in which the operation surface 6a of the pendant case 6 of the pendant switch is hermetically sealed in the pendant switch case 6 for the purpose of waterproofing, moisture proofing, dust proofing and the like. The push button cap 1 made of a synthetic resin material having flexibility is attached via the attachment ring 7 having the structure. On the front surface side of the push button cap 1, that is, on the operation surface side, a display portion 1a for displaying the function of the push button such as "ON" and "OFF" is provided, and on the back surface side, that is, the push button 4 of the holding type switch 3 described later. A cylindrical engaging member 2 having a step portion made of the same material as that of the push button cap main body is provided on the contact surface side with respect to.

Further, the pendant switch is selectively provided with a holding type switch 3 and a non-holding type switch (not shown) according to the application, but the holding type switch 3 or the non-holding type switch is consumed. Since it is a product, it is detachably attached to the pendant switch case 1 with a screw or the like for easy replacement.

Of these, the holding type switch 3 for turning the power on and off is a main body block 3a, two push buttons 4 fitted in the main body block 3a, and a movable contact 10.
A spring 9 for urging the movable contact 10 downward, and a push button 4
It consists of a spring 13 and a steel ball 14 provided in the lower part of the
A push button holding means 15 for holding the pushed state when one of the two push buttons 4 is pushed down, and a fixed contact 11 arranged on the main body block 3a.
And a terminal screw 12 connected to the fixed contact 11 and an interlock lever 8 for preventing two push buttons from being pushed down at the same time. In this case, on the upper surface side of the push button 4, that is, on the contact surface side with the push button cap 1, there is a fitting hole-shaped fitting member having a step portion to which the fitting member 2 protruding from the push button cap 1 fits and fits. 5 is formed.

In the above embodiment, the engaging member 2 formed on the push button cap 1 has a cylindrical shape having a step portion, and the engaging member 5 formed on the push button 4 has a fitting hole shape having a step portion. The shape of the engaging member is not limited to this, and the engaging member formed on the push button cap 1 is simply cylindrical and the push button 4
For example, the engaging member 5 formed in the above is formed into a fitting hole shape having a check claw, or the concavo-convex shape of the engaging member 2 and the engaging member 5 is reversed. When the push button 4 is pushed down, the contact surfaces of the push button cap 1 and the push button 4 can be maintained in the engaged state, and when the holding type switch, which is a consumable item, is replaced, the push button cap 1 and the push button 4 of the holding type switch 3 come into contact with each other. Various engaging structures that can easily release the engaged state of the surface can be adopted. In addition, holding type switch 3
The structure and the like are not limited to the above embodiment.

When the pendant switch constructed as described above is used, the engaging state of the abutting surfaces of the push button cap 1 and the push button 4 of the holding type switch 3 is maintained by the engaging members 2 and 5. As a result, the height of the pushed push-button cap on the push button side is lowered, and it is possible to easily determine from the exterior which push button of the holding type switch is pushed down. Further, the engaging members 2, which are arranged on the contact surfaces of the push button cap 1 and the push button 4 of the holding type switch 3,
Since 5 is detachable, when the holding type switch 3, which is a consumable item, is replaced, the engagement state of the contact surfaces of the push button cap 1 and the push button 4 of the holding type switch 3 is released, and only the holding type switch is released. Can be easily replaced. Further, since the push button cap 1 is held in the engagement state with the contact surface of the push button 4 of the holding type switch 3, the rigidity of the push button cap 1 increases,
It is possible to prevent the display portion 1a fitted on the surface of the push button cap 1 from coming off due to an impact.

FIG. 4 shows a second embodiment of the pendant switch according to the present invention. The operation surface of the pendant case 26 of the pendant switch is hermetically sealed in the pendant switch case 26 for the purpose of waterproofing, moisture proofing, dust proofing and the like. The push button cap 21 made of a synthetic resin material having flexibility is attached via the attachment ring 27. On the front surface side of the push button cap 21, that is, on the operation surface side, a display portion 21a for displaying the function of the push button such as "up" and "down" is provided
On the back surface side, that is, the contact surface side of the non-holding type switch 23 with the push button 24, a cylindrical engaging member 22 having a step portion formed of the same kind of material as the push button cap main body is provided in a protruding manner.

Since the non-holding type switch 23 is a consumable item, it is detachably attached to the pendant switch case 1 with a screw or the like so that it can be easily replaced.

The non-holding type switch 23 for performing hoisting and lowering operations of the hoist / crane includes a body block 23a,
Two push buttons 24 fitted in the body block 23a,
A movable side contact 30, a spring 29 for urging the movable side contact 30 downward, a return spring 33 provided under the push button 24,
When either one of the push buttons 24 is pushed down, the fixed contact 31 arranged on the main body block 23a, the terminal screw 32 connected to the fixed contact 31, and the two push buttons are prevented from being pushed down at the same time. Although it has a conventionally known structure including an interlock lever 28, in the case of the present embodiment, the push button cap 21 is provided on the upper surface side of the push button 24, that is, on the contact surface side with the push button cap 21.
A fitting hole-shaped fitting member 25 having a step portion to which the fitting member 22 projecting from is fitted and fitted is formed.

In the above embodiment, the push button cap 21
The engaging member 22 formed in the above is formed into a cylindrical shape having a step,
Although the engaging member 25 formed on the push button 24 has a fitting hole shape having a step, the shape of the engaging member is not limited to this, and the engaging member formed on the push button cap 21 has a simple cylindrical shape. A non-holding type switch is formed by the engaging members 22 and 25, for example, the engaging member 25 formed in 24 has a fitting hole shape having a check claw, or the concave and convex shapes of the engaging member 22 and the engaging member 25 are reversed. When the push button 24 of 23 is pushed down, the engagement state of the contact surfaces of the push button cap 21 and the push button 24 can be maintained, and at the time of exchanging the non-holding type switch, which is a consumable item, the push button cap 21 and the non-holding type switch 23 are pushed. Various engaging structures that can easily release the engaged state of the contact surface of 24 can be adopted. Further, the structure of the non-holding type switch 23 is not limited to the above embodiment.

When the pendant switch constructed as described above is used, the engaging states of the contact surfaces of the push button cap 21 and the push button 24 of the non-holding type switch 23 are held by the engaging members 22 and 25. As a result, the push button 24 that is locked in the depressed state due to the failure of the non-holding type switch 23 can be easily identified from the appearance. Further, since the engaging members 22 and 25 disposed on the contact surfaces of the push button cap 21 and the push button 24 of the non-holding type switch 23 are detachable, when the non-holding type switch 23, which is a consumable item, is replaced. The engagement state of the contact surfaces of the push button cap 21 and the push button 24 of the non-holding type switch 23 can be released, and only the non-holding type switch can be easily replaced. Also,
The push button cap 21 is a push button 24 of the non-holding type switch 23.
Since it is held in a locked state on the contact surface of the push button cap 2,
The rigidity of No. 1 is increased, and it is possible to prevent the display portion 21a fitted on the surface of the push button cap 21 from being separated due to an impact.

FIG. 5 shows a third embodiment of the pendant switch according to the present invention. In this embodiment, the push button cap 21,
It should be noted that the push button 24 of the non-holding type switch 23 can be returned to the non-depressed position even if the return spring 33 of the push button 24 of the non-holding type switch 23 is omitted because it has a restoring force. Other configurations are the same as those of the pendant switch of the second embodiment shown in FIG.

[0022]

According to the pendant switch of the first aspect of the present invention, while having the same waterproof, moisture-proof, and dust-proof performance as the conventional ones, the push-button cap and the push-button switch of the holding type switch are provided by the engaging member having a simple structure. By engaging the contact surface of the, it is possible to easily determine from the exterior which push button of the holding type switch is pressed down, improving work efficiency and preventing operation mistakes. .

Similarly, according to the pendant switch of the second aspect of the present invention, the non-holding type switch is fixed by engaging the push button cap and the contact surface of the push button of the non-holding type switch with the engaging member having a simple structure. The push button locked in the depressed state due to the failure can be easily discriminated from the appearance, and appropriate measures can be promptly taken for the failure, and the safety can be improved. Further, since the push button cap has a restoring force by itself, the push button of the non-holding type switch can be returned to the non-pushed-down position even if the return spring of the push button of the non-holding type switch is omitted. The manufacturing cost of the non-holding type switch can be reduced, and when the return spring is provided, the push button of the non-holding type switch has a dual structure of the restoring force of the push button cap and the return spring. The push button of the non-holding type switch can be returned to the non-pushing down position, and even if the push button cap or the return spring is damaged, the push button of the non-holding type switch can be returned to the non-pushing down position, thus ensuring safety. Can be improved.

Further, according to the pendant switch of the first invention or the second invention, the engaging member arranged on the contact surface of the push button cap and the push button of the holding type switch or the non-holding type switch is detachable. Therefore, when exchanging the holding type switch or non-holding type switch, which is a consumable item, the engagement state of the push button cap and the contact surface of the holding button of the holding type switch or the non-holding type switch is released, and the holding type switch or Only the non-holding type switch can be easily replaced. Also, since the push button cap is held in a state of being engaged with the contact surface of the push button of the holding type switch or the non-holding type switch, the rigidity of the push button cap increases, and the display section fitted on the surface of the push button cap comes off due to impact. Can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing an appearance of a pendant switch of the present invention.

FIG. 2 is a diagram showing an internal structure of a pendant switch of the present invention.

FIG. 3 is a diagram showing an assembly structure of a pendant switch of the present invention.

FIG. 4 is a diagram showing an internal structure of a pendant switch of the present invention.

FIG. 5 is a diagram showing an internal structure of a pendant switch of the present invention.

FIG. 6 is a diagram showing an internal structure of a conventional pendant switch.

FIG. 7 is a diagram showing an internal structure of a conventional pendant switch.

[Explanation of symbols]

 1 Push Button Cap 2 Locking Member 3 Holding Switch 4 Push Button 5 Locking Member 6 Pendant Switch Case 7 Mounting Ring 8 Interlock Lever 21 Push Button Cap 22 Locking Member 23 Non-Retaining Switch 24 Push Button 25 Locking Member 26 Pendant Switch Case 27 Mounting ring 28 Interlock lever 33 Return spring

Claims (2)

[Claims] 1. A push-button cap made of a flexible material and an engaging member are provided on the contact surface of the push button of the holding switch so that the contact surface of the push button cap and the push button of the holding switch can be engaged and disengaged. A pendant switch characterized by being configured as. 2. An engaging member is provided on the contact surface between the push button cap made of a flexible material and the push button of the non-holding type switch, and the contact surface between the push button cap and the push button of the non-holding type switch is engaged. A pendant switch characterized by being detachable.