JP5455984B2 - Emergency stop button mounting structure - Google Patents

Description

  The present invention relates to an emergency stop button mounting structure for urgently stopping an engine during operation in an engine-driven work machine such as an engine-driven generator, an engine-driven welder, and an engine-driven compressor.

  In an engine-driven work machine, it is necessary to stop the engine immediately in order to ensure safety when an emergency situation occurs, such as abnormal vibration or abnormal noise generated in the engine. In preparation for such a case, an emergency stop button is provided on the engine-driven work machine, and when it is pressed in an emergency, the engine can be stopped immediately.

  2. Description of the Related Art Conventionally, an emergency stop button of an engine-driven work machine is provided so as to protrude from a cover body in the vicinity of a work position, as shown in Patent Document 1, for example. However, if the emergency stop button is provided so as to protrude from the cover body, the emergency stop button may be pushed by an erroneous operation during work, and the engine may be stopped. Also, in the case of a push button type emergency stop button, the button is pressed until it comes to an emergency stop, and when the button is released after stopping, the button returns to its original position by the action of a spring. It can be difficult to determine whether or not the engine has stopped.

  Therefore, an emergency stop button switch called a push-lock turn reset switch as shown in FIG. 8 is used so that when the button is pressed, the pressed state is maintained. became. 8A is a front view of the emergency stop button switch 1, FIG. 8B is a side view, 11 is a switch pressing portion, 12 is a switch operating rod, 13 is a terminal, 14 is a contact unit, and 15 is a lock. It is a nut.

  The switch pressing portion 11 has a disk shape, and an arrow indicating the rotation direction is displayed on the upper surface thereof as shown in FIG. When the switch pressing part 11 is pressed, the switch operating rod 12 is pressed to operate the contact unit 14. At that time, the emergency stop button switch 1 is locked, and the state remains unchanged even if the hand is released from the switch pressing part 11. Retained.

  On the other hand, when the switch pressing portion 11 and the switch operating rod 12 are in the locked state, when the switch pressing portion 11 is rotated in the direction of the arrow, the lock is released and the switch operating rod 12 returns to the original state.

  As shown in FIG. 9, the emergency stop button switch 1 is disposed in a recess formed in a part of the operation panel 2 so that the switch pressing portion 11 does not protrude from the outer surface of the operation panel 2. Thus, if the switch pressing portion 11 is not protruded, it is possible to prevent the emergency stop button switch 1 from being pushed by an erroneous operation during the operation. Further, since the emergency stop button switch 1 is locked in a pressed state when the switch pressing portion 11 is pressed, it can be determined whether or not the emergency stop button switch 1 has been operated.

JP 2008-307004 A

  By the way, in the engine-driven work machine, when the engine is stopped, the engine is cooled for a predetermined time for engine protection and then stopped. In particular, in the case of an engine with a turbo, the turbo is very hot, and if it is suddenly stopped, the hot turbo is rapidly cooled, causing damage and failure, and shortening the life of the engine. In addition, if there is a flammable material near the turbo in the engine-driven work machine, a fire may occur. Therefore, sufficient cold machine operation is required when stopping.

  Therefore, when stopping the engine-driven work machine, first stop the load during work, and then set the engine running in the "high speed" state to the "low speed" or "idling" side using the speed selector switch. The engine can be stopped for about 5 minutes by cooling the engine and cooling the engine sufficiently before turning off the key switch. There is also an automatic stop function that automatically performs a cold operation without immediately stopping the engine even when the key switch is turned off.

  As described above, when stopping the engine-driven work machine, it is necessary to stop the engine after the engine is cooled for a predetermined time or more.

  However, in the engine-driven work machine having the conventional emergency stop button mounting structure, since the emergency stop button can be easily operated, there is a problem that the operator easily operates even in an emergency. . For example, when the engine is stopped after the work is finished, an illegal operation of stopping by pressing an emergency stop button may occur instead of the normal stopping method.

  Also, if you have an automatic stop function, even if the key switch is turned off, the engine will automatically run cold and will not stop immediately. It can happen.

  As described above, when the emergency stop button is pushed unnecessarily except when the engine is supposed to be emergency stopped, there is a possibility that the life of the engine may be shortened or a fire may be caused.

  In view of such a problem, the present invention aims to prevent an emergency stop button from being easily pressed by making it difficult to release the pressed state when the emergency stop button is pressed. .

     In order to solve the above-mentioned problem, in the invention according to claim 1 of the present application, when the disk-shaped switch pressing portion is pressed, the operation state is held by the lock mechanism, and the lock is locked by rotating the switch pressing portion in the circumferential direction. An emergency stop button mounting structure for mounting an emergency stop button switch to be released to an operation panel of an engine-driven work machine, the operation panel having a through hole of a size that allows a fingertip to be inserted and detached using a tool. A switch bracket which is fixed to the outer surface of the engine-driven work machine by a possible fixing tool, has a switch mounting hole formed on the operation panel facing surface inside the portion where the through hole of the operation panel is provided, and has an opening on the side. The emergency stop button switch is attached to the switch attachment hole of the switch bracket.

   In the invention according to claim 2 of the present application, in the invention according to claim 1, a switch plate slidable in the switch bracket is interposed between the through hole of the operation panel and the switch pressing portion. It is characterized by.

The invention according to claim 3 of the present application is characterized in that, in the invention according to claim 2, the switch plate is made transparent.

  The invention according to claim 4 of the present application is characterized in that, in the invention according to claim 1, 2, or 3, the opening is provided on the left and right of the switch bracket.

The present invention has the following effects.
That is, in the invention according to claim 1, the through hole of the operation panel which has a through hole of a size into which a fingertip can enter and is fixed to the outer surface of the engine-driven work machine by a fixing tool which can be attached and detached using a tool. A switch mounting hole having a switch mounting hole formed in the surface opposite to the operation panel and having an opening on the side is mounted inside the portion provided with an emergency stop button switch having a lock mechanism. As a result, when the emergency stop button is pressed, it can be released by using a tool to remove the operation panel from the outer surface of the work machine, or hooking it to the locking piece and tilting it forward. Since it takes time and effort, it is difficult for the operator to easily press the emergency stop button.

  In the invention according to claim 2, in the emergency stop button mounting structure according to claim 1, a switch plate slidable in the switch bracket is interposed between the through hole of the operation panel and the switch pressing portion. Therefore, it is possible to prevent rainwater and dust from entering through the through holes. Moreover, in the method of pushing the emergency button by breaking the acrylic plate provided in front of the button like a fire alarm, it is necessary to replace the broken acrylic plate to restore the original state. Then, there is no need for such parts replacement.

  In the invention according to claim 3, in the emergency stop button mounting structure according to claim 2, since the switch plate is made transparent, the position of the emergency stop button inside can be seen at a glance.

  In the invention according to claim 4, in the emergency stop button mounting structure according to claim 1, 2 or 3, the openings are provided on the left and right sides of the switch bracket. Since it can be operated, the unlocking operation becomes easy.

It is a figure which shows the emergency stop button attachment structure which concerns on one Example to this invention. It is a figure which shows the external appearance of an engine drive working machine. It is a figure which shows the operating panel of an engine drive working machine. It is a figure which shows the emergency stop button attachment part of the operation panel shown in FIG. It is a figure which shows a switch bracket. It is a figure which shows a switch plate. It is operation | movement explanatory drawing of an emergency stop button. It is a figure which shows an emergency stop button. It is a figure which shows the conventional emergency stop button attachment structure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view showing an emergency stop button mounting structure according to an embodiment of the present invention. In FIG. 1, 1 is an emergency stop button switch, 2 is an operation panel, 3 is a switch bracket, 4 is a switch plate, 5 is a through hole, 6 is an opening, 7 is a stud bolt, and 8 is a nut.

  As shown in FIG. 2, the operation panel 2 is attached to the outer surface of the casing 9 of the engine-driven work machine. Inside the housing 9 is housed an engine and a working machine main body such as a generator, a welding machine, and a compressor driven by the engine.

  As shown in FIG. 3, the operation panel 2 is provided with a key switch 21 for starting and stopping the engine and various instruments 22 for displaying the remaining amount of fuel, the engine temperature, and the like. After engaging the stop piece 23 with the lower edge of the opening of the housing 9 of the engine drive working machine, the hexagon bolts or screws with cross holes are passed through the plurality of mounting holes 24 provided in the peripheral portion, thereby driving the engine. It is attached to the chassis 9 of the machine.

  The emergency stop button mounting portion 25 that forms a part of the operation panel 2 is formed with a through hole 5 that is large enough to receive a fingertip, and the emergency stop button switch 1 is provided therein. FIG. 4 shows the emergency stop button mounting portion 25. As shown in FIG. 4, the switch pressing portion 11 is visible inside the through hole 5.

  As shown in a front view, a plan view, and a side view in FIG. 5, the switch bracket 3 has a box shape having openings 6 on the left and right sides, and the emergency stop button switch 1 is attached to the inner surface of the box. A switch mounting hole 31 is provided, and a bracket mounting piece 32 for mounting the switch bracket 3 to the operation panel 2 is provided above and below. The bracket mounting pieces 32, 32 are provided with stud bolt insertion portions 33 for passing the stud bolts 7.

  The switch plate 4 is a transparent plastic plate and has a quadrangular shape as shown in FIG. 6, and its dimension is slightly smaller than the inner dimension of the switch bracket 3 and is parallel to the inner surface of the switch bracket 3. The switch bracket 3 can be slid as it is.

  The emergency stop button switch 1 is attached to the operation panel 2 as follows. First, the contact unit 14 and the lock nut 15 are removed from the emergency stop button switch 1, and the end portions thereof are inserted into the switch mounting holes 31 of the switch bracket 3, and are tightened and fixed with the lock nut 15. Thereafter, the contact unit 14 is attached.

  The switch bracket 3 to which the emergency stop button switch 1 is attached in this way is attached with the stud bolt 7 and the nut 8 to the inside of the operation panel 2 where the through hole 5 is provided. At that time, the switch plate 4 is mounted between the switch pressing portion 11 and the through hole 5 of the emergency stop button switch 1, but the pressing stroke of the emergency stop button switch 1 is usually 5 to 6 mm. If the switch plate 4 is attached with the switch plate 4 pushed in by about 1 mm, the switch plate 4 is pressed against the through hole 5 side by the reaction force of the spring on the emergency stop button switch 1 side. Is done.

  Note that the shape of the inside of the switch bracket 3 and the shape of the switch plate 4 are not necessarily rectangular, and any shape can be used as long as the switch plate 4 can smoothly slide in the switch bracket 3. If the switch plate 4 is made transparent, the position of the emergency stop button inside can be seen at a glance. However, if it is not necessary, it may be formed of an opaque material.

Next, the operation of this emergency stop button will be described with reference to FIG. FIG. 7A shows a normal state before the emergency stop button is pressed. In an emergency such as when an abnormal noise is generated in the engine, the switch plate 4 is pushed through the through hole 5 with a finger of a hand. As a result, as shown in FIG. 7B, the switch pressing portion 11 of the emergency stop button switch 1 is pushed in, the contact of the emergency stop button switch 1 is opened, and the engine is urgently stopped. When the emergency stop button switch 1 is actuated in this way, the emergency stop button switch 1 is locked and does not return to the state of FIG. Moreover, since the switch pressing portion 11 of the emergency stop button switch 1 cannot be pinched and rotated as it is, the emergency stop button switch 1 cannot be unlocked.

  In order to unlock the emergency stop button switch 1, several hex bolts or crosses that fix the operation panel 2 to the outer surface of the housing 9 through the mounting hole 24 using a tool such as a spanner or a screwdriver. The screw with a hole is removed, the operation panel 2 is removed from the housing 9 or tilted forward, a finger is inserted from the opening 6 of the switch bracket 3 and the switch pressing portion 11 is turned to release the lock.

  At that time, although the reaction force of the spring of the emergency stop button switch 1 has disappeared and the switch plate 4 is somewhat loose, it does not get caught in the switch bracket 3, and the emergency stop button switch 1 is turned by turning the switch pressing portion 11. When the lock is released, the emergency stop button switch 1 and the switch plate 4 are restored to the original state by the reaction force of the spring.

DESCRIPTION OF SYMBOLS 1 Emergency stop button switch 2 Operation panel 3 Switch bracket 4 Switch plate 5 Through-hole 6 Opening part 7 Stud bolt 8 Nut 9 Case 11 Switch pressing part 12 Switch operation rod 13 Terminal 14 Contact unit 15 Lock nut 21 Key switch 22 Instrument 23 Locking piece 24 Mounting hole 25 Emergency stop button mounting part 31 Switch mounting hole 32 Bracket mounting piece 33 Stud bolt insertion part

Claims (4)

When the disk-like switch pressing part is pressed, the operating state is maintained by the lock mechanism, and an emergency stop button switch that is unlocked by rotating the switch pressing part in the circumferential direction is attached to the operation panel of the engine-driven work machine Emergency stop button mounting structure,
The operation panel has a through hole of a size that allows a fingertip to enter, and is fixed to the outer surface of the engine-driven work machine by a tool that can be attached and detached using a tool. An emergency is characterized in that a switch mounting hole is formed on the inner face of the operation panel, a switch bracket having an opening on the side is mounted, and the emergency stop button switch is mounted in the switch mounting hole of the switch bracket. Stop button mounting structure.   The emergency stop button mounting structure according to claim 1, wherein a switch plate slidable in the switch bracket is interposed between the through hole of the operation panel and the switch pressing portion.   The emergency stop button mounting structure according to claim 2, wherein the switch plate is transparent.   The emergency stop button mounting structure according to claim 1, wherein the opening is provided on the left and right of the switch bracket.

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