JPH01312127A - Safety device for detachable installation of bucket - Google Patents

Abstract

PURPOSE:To provide a precautionary means to prevent a bucket from falling off by providing, to a member where the bucket is detachably installed to a bracket of an industrial vehicle, switches that operate when a lock pin, fixing the bucket to the bracket, is fixed or unfixed, and by making the switches connected to a warning device. CONSTITUTION:A bucket 7 is detachably installed to a bracket 8 that is fixed to a lift arm 9, and the bucket 7 is fixed to the bracket 8 with a lock pin 6. To this device of detachable installation for the bucket, switches 11 and 12 that operate when the lock pin 6 is fixed or unfixed are provided and are connected to a warning device. When a vehicle operator tries to start the vehicle with the lock pin 6 not fixed properly, the warning device works and a warning is given to the operator.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a safety device for a bucket attachment/detachment mechanism of an industrial vehicle 5, such as a shovel loader, used for lifting and lowering cargo, construction work, and the like.

[Conventional wave (nei)]

Conventionally, a bucket attachment/detachment mechanism is known, as shown in FIGS. 5 and 6, for example, as disclosed in Japanese Utility Model Publication No. 56-40923.

As shown in FIG. 5, the bucket underwear mechanism has a lift arm 9. and dump cylinder piston rod 91
A bucket 7 is removably attached to a bracket 8 provided at the tip (double-dashed line).

That is, the device has an ear plate 71 provided on the lower back surface of the bucket 7.
and a lower joint Fj, 81 provided on the lower end surface of the bracket 8.
The bucket 7 and bracket 8 are removably fixed by inserting the lock pin 6 into the through hole 71L811.

The lock pin 6 is pivotally connected to the link plate 5 via a rotation pin 61 at its upper end. Further, the link plate 5 has a detachable lever 4 at its upper end.
It is pivotally connected to via a lock pin 51. In addition, the attachment/detachment lever 4 is.

It is connected and pivoted to the second lever 3 via a connecting pin 41 at its substantially central portion.

The second lever 3 has a handle 3I at its upper end, as shown in FIG. The handle 31 is integrated with the second lever 3 and is biased by a spring 32.

Further, the tip of the handle 31 has an abbreviated shape,
The tip engages a hook 33.

Therefore, in order to remove the packet 7 from the bracket 8, the hook 33 is first pushed down in the Z direction against the biasing force of the spring 32 to release the engagement with the handle 3I.

Next, push down the handle 31 in the downward A direction. As a result, the connecting pin 41 also rotates approximately 90 degrees in the same direction. Further, in conjunction with this, the detachment/detachment lever 4 also rotates in the opposite direction B by approximately 9 degrees. At this time, the lock pin 51 pivoted below the attachment/detachment lever 4 is operated in the direction C to approach the packet 7. At this time, the second lock pin 6 is pulled up in the D direction by the link plate 5.

As a result, the ear plate 71 and the lower coupling plate 81 are unlocked, and the packet 7 can be removed from the bracket 8.

[Problem to be solved]

However, in the above-mentioned conventional apparatus, due to carelessness of the five workers, work such as cargo handling may be started without fully rotating the attachment/detachment lever 4 to the lock position X. When bending, there is a risk that the packet 7 will fall during the work because the lock pin 6 does not lock between the packet 7 and the bracket 8.

The present invention has been made in view of the problems of the conventional devices, and it is an object of the present invention to provide a safety device for a packet attachment/detachment mechanism that can detect the presence or absence of a lock.

[Means for solving problems]

The present invention provides a packet underwear mechanism in which a packet is detachably attached to a bracket provided on a lift arm, and the packet and the bracket are fixed by a lock pin. A safety device for a packet attachment/detachment mechanism is characterized in that a switch is provided which is activated during attachment/detachment, and the switch is connected to a warning device.

In the present invention, the above-mentioned switch includes, for example, a limit switch, and there are two types: a normally open type, that is, it operates only when there is contact, and a normally closed type, that is, it is always in contact, and operates only when the contact is released. be. Moreover, two of the two can also be used together. The normally open type can be installed near the attachment/detachment lever, and the normally closed type can be installed on a bracket at the back of the packet. The above-mentioned warning device may be a buzzer, for example.

There are warning sounds, sirens, lights, etc.

What should be noted here is that a switch that is activated when the lock pin is attached or detached is provided in the packet attachment/detachment section, and the switch is connected to a warning device. Here, the packet attachment/detachment part refers to the part where the packet and bracket are attached to and detached from each other.

Specifically, the back of the packet 2. Refers to the front part of the bracket. More specifically, the switch 9 is disposed so as to be interlocked with an attachment/detachment lever for attaching and detaching the lock pin on the bracket side, for example. Alternatively, it is placed between the bracket and the packet.

C action and effect] A safety device for a packet attachment/detachment mechanism according to the present invention is as follows.

Equipped with a switch that operates when the lock pin is attached or removed.

The switch is coupled to a warning device. Therefore, if you start work without locking the lock pin, for example, the attachment/detachment lever comes into contact with the switch, and the switch is activated.

Then, the dangerous state of unlocking can be notified to the operator via the warning device.

In addition, when a switch is provided on the back of the packet, if the back of the packet remains floating even when the detachment lever is turned to the lock side (the switch is in the OFF state), the lock pin is inserted into the hole on the packet side. It may not be inserted. In this state, the switch on the back of the packet is activated.

Dangerous conditions can be notified to workers via warning devices.

〔Example〕

A safety device for a packet attachment/detachment mechanism according to the present invention.

This will be explained using FIGS. 1 to 4.

That is, the safety device in this example is the first switch 11.

A second switch 12, a warning device 2 connected to the first and second switches, a lock pin 6 that fixes the packet 7 and the bracket 8 at the lower end of the bracket 8, and a link pivotally connected to the lock pin 6. It consists of a plate 5 and a detachable lever 4 pivotally connected to the link plate 5.

The first switch 11 is a normally open limit switch, and is connected to the warning device 2. Further, the first switch 11 is located on the bracket 8 and disposed near the detachable plate 42 of the detachable lever 4 (FIG. 2). As a result, the first switch 11 is activated when the attachment/detachment lever 4 is in the unlocking direction.

The second switch 12 is a normally closed limit switch, and is connected to the warning device 2. Further, the second switch 12 is turned off even when the first switch is OFF, that is, when the attachment/detachment lever 4 is in the locked position, and when the back of the packet is floating.

The lock pin 6 may not fit into the hole on the packet side, which is dangerous. In order to detect this dangerous situation, the second switch 12 is always placed on the bracket 8, that is, when it is normally locked, it contacts the back side of the packet 7, and when the packet leaves the bracket, the second switch 12 is activated.

Further, the above-mentioned warning device 2 is as shown in FIG.

It is connected to the first and second switches 11 and 12.

This connection circuit has one end connected to the key switch 13 and the other end connected to the ground 14.

Further, the lock pin 6 is connected to a lower connecting plate 81 and an ear plate 7 protruding from the packet 7 at the lower end of the bracket 8.
1 and fixed. That is, the lower coupling plate 81 provided at the lower end of the bracket 8 has a through hole 811 through which the lock pin 6 is inserted.
has. Moreover, the ear plate 71 protruding from the packet 7 is
Similarly, it has a through hole 711 through which the lock pin 6 is inserted.

Thus, the lock pin 6 is inserted into the through holes 711, 811 to lock the lower coupling plate 81 and the ear plate 71. As a result, the packet 7 is attached and coupled to the bracket 8.

Further, the lock pin 6 is linked to the detachable plate 42 of the detachable lever 4 via the link plate 5. The attachment/detachment lever 4 is fixed to a connecting pin 41 pivotally attached to the bracket 8 (FIG. 2).

The safety device in this example is configured as described above, so 1.
It has the following effects.

That is, when the detachment lever 4 is pushed down in the downward G direction,
The lock pin 6 is pulled up in the H direction via the link plate 5. As a result, the lower coupling plate 81 and the ear plate 71 are in a separated state.

The packet 7 can be removed from the bracket 8.

At this time, as shown in FIG. 2, the detachable plate 42 rotates about 90 degrees in the F direction. As a result, the detachable plate 42
The tip of the switch 3 contacts the contact 110 of the first switch 11.
The switch 11 is activated.

Then, as shown in FIG. 4, a lamp serving as the warning device 2 is turned on. That is, in the released state where the lock pin 6 is not locked, the first switch 11 is activated and the lamp is turned on.

Even if the first switch 11 is OFF, that is, the detachment lever 4 is in the locked position, the lock pin 6 may not be inserted into the hole on the packet side 7 if the back of the packet is floating, which is dangerous. It is. As shown in FIG. 3, when the packet 7 is located away in the forward direction, the second switch 12 is activated.

The contact between the contact point 120 and the back of the packet is released and 1
The warning device 2 is activated and lights up the lamp as the warning device 2, as described above. Additionally, this lamp is placed on the operation panel in front of the operator. This allows the two workers to immediately confirm the certainty of the locked state.

As described above, according to the tree example 1, when work is started with the lock pin 6 released, the lamp serving as the warning device 2 lights up, allowing the worker to be immediately notified of the dangerous situation. Therefore, according to this example, packets are prevented from falling.

A safety device for the packet underwear mechanism can be provided.

[Brief explanation of the drawing]

1 to 4 show a safety device for a packet attachment/detachment mechanism according to the present invention, in which FIG. 1 is a side view thereof, FIGS. 2 and 3 are enlarged perspective views and side views of the switch mechanism, and FIG. The figure is a connection circuit diagram of a switch and a warning device, and FIGS. 5 and 6 are side views of a conventional bucket attachment/detachment mechanism. ii., first switch. 12,, second winch. 431. Detachment lever. 429. Detachable plate. 51. Link play 1. 681. lock bin. 71. Hakesoto. 811. Fire Kent. 91. lift arm. Applicant Toyota Industries Corporation Representative Patent Attorney Yoshiyasu Takahashi

Claims (1)

[Scope of Claims] A bucket attachment/detachment mechanism in which a bucket is removably attached to a bracket provided on a lift arm, and the bucket and bracket are fixed by a lock pin, wherein the bucket attachment/detachment portion has the above-mentioned lock. 1. A safety device for a bucket attachment/detachment mechanism, comprising a switch that is activated when a pin is attached or detached, and the switch is connected to a warning device.