JP2004018212A6 - Safety belt mounting device for picking forklift - Google Patents

Abstract

In a safety belt mounting device for a picking forklift, an operator is urged to wear a safety belt and works in a safe state with the safety belt attached.
A safety bar that connects a safety belt, an optical sensor that detects whether the safety belt is connected to the safety bar, and that the safety belt is not connected to the safety bar. It has a red patrol light and an audio alarm to warn. When the safety belt 50 is connected to the safety bar 38, the light from the light projecting unit 70a is blocked by the hook portion 53, and it is detected that the safety belt 50 is connected to the safety bar 38. If the safety belt 50 is not connected to the safety bar 38, the light from the light projecting unit 70a is not blocked, and it is detected that the safety belt 50 is not connected, and the red patrol light and the sound alarm are activated.
[Selection] Figure 2

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety belt mounting device for a picking forklift that can move a cockpit up and down together with a fork and load / unload a load at a high place.
[0002]
[Prior art]
Conventionally, it has a fork that moves up and down along a mast erected on a vehicle body, and this fork is inserted into an opening of a cargo carrier bed called a pallet, and the cargo loaded on the pallet is lifted together with the pallet and conveyed. There is a forklift. There are various types of forklifts, and the forklifts are operated at a high place such as a rack shelf in order to perform a picking operation for loading / unloading loads individually with a pallet inserted into the fork. Some cockpits move up and down together with the fork. Such a forklift is called a picking forklift.
[0003]
In the picking forklift, the cockpit moves to a high place, so that an operator who rides in the cockpit of the picking forklift wears a safety belt to prevent the cockpit from falling from the cockpit. A safety bar for securing the safety belt is provided in the cockpit of the picking forklift. The safety belt has a belt portion that is wound around the trunk of the worker and holds the worker, and a hook portion that is detachably engaged with the safety bar is connected to the belt portion via a wire rope. It has become.
[0004]
When an operator gets on the cockpit and performs work, the operator wraps the belt portion of the safety belt around his / her body and attaches the hook portion to the safety bar of the cockpit. As a result, the safety belt is secured to the cockpit, and an operator wearing the safety belt is prevented from dropping from the cockpit and can work safely.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional picking forklift, if the user forgets to wear the safety belt or neglects the wearing of the safety belt, no countermeasure has been taken. For this reason, there is a possibility that work at a high place may be performed without wearing a safety belt.
[0006]
The present invention has been made to solve the above-described problems, and can alert a worker who is in the cockpit of a picking forklift to wear a safety belt and can work in a safe state with the safety belt attached. An object of the present invention is to provide a safety belt mounting device for a picking forklift.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention provides a safety belt attaching device for fastening a safety belt attached to an operator who is mounted in a cockpit that can be moved up and down together with a fork of a picking forklift. A safety belt mounting portion to be stopped, a detection means for detecting whether or not the safety belt is locked to the safety belt mounting portion, and the safety belt is locked based on a detection signal output from the detection means. And alarm means for issuing an alarm when not.
[0008]
In this configuration, it is detected whether or not the safety belt is secured to the safety belt mounting portion, and an alarm is issued when the safety belt is not secured. For this reason, the operator boarding the cockpit of the picking forklift will not forget to wear the safety belt, and will be prompted to wear the safety belt.
[0009]
According to a second aspect of the present invention, in the safety belt mounting device for a picking forklift according to the first aspect, the safety belt mounting portion is formed of a rod-like member that is movably engaged with a hook portion connected to the safety belt. The means includes a light projecting unit that projects light from one end side of the rod-shaped member and a light receiving unit that receives light from the light projecting unit on the other end side, and the hook unit is engaged with the rod-shaped member. , Which is an optical sensor that blocks light.
[0010]
In this configuration, since the hook portion of the safety belt is movably engaged with the rod-shaped member, the safety belt can freely move along the rod-shaped member. Since the detecting means projects light from the light projecting portion on one end side of the rod-shaped member to the light receiving portion on the other end side, the light is blocked regardless of the position of the hook portion engaged with the rod-shaped member. Is done. Thereby, the detection means can detect the engagement of the hook portion with the rod-like member regardless of the position of the rod-like member where the hook portion is engaged.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of a picking forklift provided with a safety belt mounting device. The picking forklift 1 includes an outer mast 3 and an inner mast 4 erected on a vehicle body 2 and includes a cockpit (control room) 10 for various operations of the picking forklift 1. The outer mast 3 is fixed to the vehicle body 2, and the inner mast 4 is moved up and down along the outer mast 3. The vehicle body 2 is provided with a hydraulically driven lift cylinder 5 adjacent to the inner mast 4, and the inner mast 4 is moved up and down by the operation of the lift cylinder 5. In addition, driving wheels (not shown) and wheels 6 for traveling on the road are provided at the lower part of the vehicle body 2.
[0012]
The cockpit 10 is moved up and down along the inner mast 4. The cockpit 10 is connected to the vehicle body 2 by a chain (not shown) through a sheave (not shown) that moves up and down together with the inner mast 4. When the inner mast 4 rises, the sheave rises with the inner mast 4, Ascended to rise. When the inner mast 4 is lowered, the sheave is lowered and the cockpit 10 is also lowered.
[0013]
In this cockpit 10, a pair of cockpit struts 20 are erected on the floor 30, and a wall 35 is provided between the cockpit struts 20. A guard bar 36 that partitions the cockpit 10 and prevents the driver from falling is attached to the cockpit post 20 and the floor 30, and a head guard 37 that protects the operator's head is provided above the cockpit post 20. Yes. The guard bar 36 can be partly removed for getting on and off the cockpit 10 by the operator. A pair of forks 40 extending substantially horizontally is fixed to the floor 30 of the cockpit 10. The fork 40 is inserted into an opening of a pallet (not shown) for carrying goods and lifts the goods loaded on the pallet together with the pallet. Since the fork 40 is fixed to the cockpit 10, it moves up and down together with the cockpit 10. As a result, the pallet with the fork 40 inserted is also moved up and down together with the cockpit 10, and the picking work for loading / unloading the cargo individually with the pallet is performed at a high place by the worker who rides on the cockpit 10. .
[0014]
Further, a safety bar (safety belt attaching portion) 38 is provided on the head guard 37 of the cockpit 10. The safety bar 38 is used to keep a safety belt, which is worn by an operator who is on the cockpit 10, to prevent falling. The safety bar 38 is composed of a bar-like member extending substantially horizontally, and is attached to the head guard 37 by attachment members 39a and 39b. The safety bar 38 is provided with a transmissive optical sensor (detecting means) 70 including a light projecting unit 70a and a light receiving unit 70b. The optical sensor 70 detects whether or not a safety belt attached to the worker is secured to the safety bar 38. The light projecting unit 70a is disposed on one end side of the safety bar 38, projects light along the safety bar 38, and the light receiving unit 70b is disposed on the other end side of the safety bar 38. The light from the unit 70a is received.
[0015]
A maneuvering device 60 for maneuvering the picking forklift 1 is disposed on the wall 35 of the cockpit 10. The control device 60 is provided with a key insertion part 61. By inserting a control key (not shown) into the key insertion part 61, various operations of the picking forklift 1 are possible. Then, by operating the control device 60 with the control key inserted into the key insertion portion 61, the picking forklift 1 travels and the cockpit 10 moves up and down.
[0016]
Furthermore, a yellow patrol light 81, a red patrol light (alarm means) 82, and an audio alarm (alarm means) 83 are installed on the side of the wall portion 35 of the cockpit 10 via an attachment arm. The yellow patrol light 81 emits a yellow light to alert the surroundings that the picking forklift 1 is working. The red patrol light 82 emits a red light, and warns that the safety belt is not secured to the safety bar 38. Further, the voice alarm 83 emits a voice by a synthesized sound such as “please wear a safety belt”, for example, and warns that the safety belt is not secured to the safety bar 38. The safety bar 38, the optical sensor 70, the red patrol light 82, and the sound alarm 83 constitute a safety belt attaching device.
[0017]
FIG. 2 shows a safety belt and an optical sensor 70 worn by an operator who rides on the cockpit 10. The safety belt 50 includes a belt portion 51 that is wound around the body of the worker and holds the worker, a wire rope 52 that is connected to the belt portion 51 at one end, and a hook portion that is provided at the other end of the wire rope 52. It consists of 53. The hook portion 53 is hooked on the safety bar 38 to be engaged with the safety bar 38, and the hook 53 is rotatable to the engagement piece 53a to attach and detach the engagement piece 53a to and from the safety bar 38. It comprises a pivot piece 53b that is pivotally supported. The safety belt 50 is secured to the cockpit 10 by engaging the hook portion 53 with the safety bar 38, and prevents the worker wearing the belt portion 51 from dropping from the cockpit 10. At this time, since the safety bar 38 is formed of a rod-like member extending substantially horizontally, the hook portion 53 of the safety belt 50 is movable while being engaged with the safety bar 38.
[0018]
In the optical sensor 70, a light projecting unit 70a is disposed on one end side of the safety bar 38, and a light receiving unit 70b is disposed on the other end side. The attachment member 39a on one end side of the safety bar 38 is formed with a holding portion 71a on the opposite side of the safety bar 38, and the light projecting portion 70a is held by the holding portion 71a. On the other hand, the attachment member 39b on the other end side of the safety bar 38 is formed with a holding portion 71b on the opposite side of the safety bar 38, and the light receiving portion 70b is held by this holding portion 71b.
[0019]
An opening 72a is formed in the attachment member 39a near the upper surface of the safety bar 38, and light projected from the light projecting portion 70a passes through the opening 72a. On the other hand, an opening 72b is formed in the attachment portion 39b near the upper surface of the safety bar 38, and light passing through the opening 72b is incident on the light receiving portion 70b. The light projecting unit 70a is installed so that the optical axis of the light to be projected coincides with the axis passing through the opening 72a and the opening 72b. As a result, the light projected from the light projecting unit 70a passes through the opening 72a, then travels along the upper surface of the safety bar 38 along the safety bar 38, and is received by the light receiving unit 70b through the opening 72b. Is done.
[0020]
In the safety belt mounting device, when the hook portion 53 of the safety belt 50 is engaged with the safety bar 38, the engagement piece 53a of the hook portion 53 blocks the optical path from the opening 72a to the opening 72b. Light from the light projecting unit 70a is blocked by the engaging piece 53a and is not received by the light receiving unit 70b. If the hook portion 53 of the safety belt 50 is not engaged with the safety bar 38, the light path from the opening 72a to the opening 72b is not blocked, and the light from the light projecting portion 70a is received by the light receiving portion 70b. Is received. The engaging piece 53a of the hook portion 53 is formed with a large thickness in the radial direction of the safety bar 38 so as to block the optical path from the opening 72a to the opening 72b.
[0021]
In this way, the light receiving unit 70b receives light from the light projecting unit 70a when the hook portion 53 of the safety belt 50 is not engaged with the safety bar 38, and the hook portion 53 is engaged with the safety bar 38. The light from the light projecting unit 70a is not received. The optical sensor 70 detects whether the safety belt 50 is secured to the safety bar 38 based on the light receiving state of the light receiving unit 70b. The red patrol light 82 and the sound alarm 83 operate based on a detection signal from the optical sensor 70 and issue an alarm when the safety belt 50 is not secured to the safety bar 38.
[0022]
Next, an electrical block configuration of the safety belt mounting device is shown in FIG. The safety belt mounting device 100 is connected to an in-vehicle battery 90 that supplies voltage to various electrical devices of the picking forklift 1 via a key switch 62. The key switch 62 is a switch that is turned on when a steering key is inserted into the key insertion portion 61 of the steering device 60. The safety belt mounting apparatus 100 includes a DC-DC converter 91 that receives a voltage from the battery 90 and generates a voltage of 24 [v]. In addition to the light projecting unit 70 a and the light receiving unit 70 b of the optical sensor 70, the DC-DC converter 91 is connected to a repeater 84 that relays the voltage from the DC-DC converter 91. The repeater 84 is connected to the yellow patrol light 81, the red patrol light 82, and the audio alarm 83.
[0023]
A relay coil 92 a is connected between the light receiving unit 70 b of the optical sensor 70 and the DC-DC converter 91. Two relay contacts 92b-1 and 92b-2 are provided for the relay coil 92a, and the relay contact 92b-1 is connected between the red patrol light 82 and the repeater 84. 92b-2 is connected between the voice alarm 83 and the repeater 84. These two relay contacts 92b-1 and 92b-2 are both normally closed contacts. When the relay coil 92a is not energized, the contacts are closed and kept on, and the relay coil 92 is energized. Contact opens and turns off. Further, the DC-DC converter 91 receives the voltage supply from the battery 90 when the key switch 62 is turned on, that is, the operation key is inserted into the key insertion unit 61, and the light projecting unit 70a, the light receiving unit 70b, and the relay. A voltage is supplied to the device 84.
[0024]
The light projecting unit 70a of the optical sensor 70 operates by receiving a voltage supply from the DC-DC converter 91, and projects light. The light receiving unit 70b operates by receiving a voltage supply from the DC-DC converter 91, and receives light from the light projecting unit 70b. The light receiving unit 70b is on-type when light is blocked, and is turned on when light from the light projecting unit 70a is blocked and light from the light projecting unit 70a is not received. A voltage is applied to the relay coil 92a when the light receiving unit 70b is turned on, thereby opening the relay contacts 92b-1 and 92b-2 to be turned off.
[0025]
The yellow patrol light 81 operates by receiving a voltage supply from the repeater 84. The red patrol light 82 is activated by receiving a voltage supply from the repeater 84. When the relay contact 92b-1 is opened and turned off, the voltage supply from the repeater 84 is cut off and the operation is stopped. The voice alarm 83 is activated by receiving a voltage supply from the repeater 84. When the relay contact 92b-2 is opened and turned off, the voltage supply from the repeater 84 is cut off and the operation is stopped. The yellow patrol light 81 emits yellow light in the operating state, and the red patrol light 82 emits red light in the operating state. Further, the voice alarm 83 emits a voice by a synthesized sound such as “Please wear a safety belt” in the operating state.
[0026]
In the picking forklift 1 configured as described above, when a control key is inserted into the key insertion part 61 of the control device 60, the key switch 62 is turned on, and a voltage is supplied from the battery 90 to the DC-DC converter 91. The As a result, a voltage is supplied from the DC-DC converter 91 to the yellow patrol light 81 via the repeater 84, the yellow patrol light 81 is activated, and a yellow light is emitted. At the same time, a voltage is supplied from the DC-DC converter 91 to the light projecting units 70a and 70b of the optical sensor 70, the light projecting unit 70a projects light, and the light receiving unit 70b emits light from the light projecting unit 70a. Receives light.
[0027]
At this time, if the hook part 53 of the safety belt 50 is not engaged with the safety bar 38, the light from the light projecting part 70a is received by the light receiving part 70b, the light receiving part 70b is off, and the relay coil 92a operates. The relay contacts 92b-1 and 92b-2 remain on. As a result, a voltage is supplied from the DC-DC converter 91 to the red patrol light 82 and the audio alarm 83 via the repeater 84, and the red patrol light 82 and the audio alarm 83 are activated. That is, the red patrol light 82 emits a red light, and the sound alarm 83 emits a sound such as “Please wear a safety belt”.
[0028]
Now, when the hook portion 53 of the safety belt 50 is engaged with the safety bar 38, the light from the light projecting portion 70a to the light receiving portion 70b is blocked by the hook portion 53, the light receiving portion 70b is turned on, and the relay coil 92a is turned on. A voltage is applied, the relay coil 92a operates, and the relay contacts 92b-1 and 92b-2 are turned off. As a result, the red patrol light 82 and the audio alarm 83 are deactivated when the voltage supply from the repeater 84 is cut off.
[0029]
On the other hand, when the hook portion 53 of the safety belt 50 is removed from the safety bar 38, the light from the light projecting portion 70a is received by the light receiving portion 70b, the light receiving portion 70b is turned off, and the relay coil 92a stops operating. The relay contacts 92b-1 and 92b-2 are returned to the ON state. Thus, the red patrol light 82 and the audio alarm 83 are activated again in response to the voltage supply from the repeater 84.
[0030]
As described above, in the present embodiment, when the hook portion 53 of the safety belt 50 is not engaged and secured to the safety bar 38, the red light light of the red patrol light 82 and the voice alarm 83 “wearing the safety belt”. A warning is issued by a voice such as “Please”. Thereby, the operator who gets on the cockpit 10 of the picking forklift 1 does not forget to wear the safety belt 50, and the wearing of the safety belt 50 is urged.
[0031]
In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, instead of the transmissive optical sensor 70, a reflective optical sensor, a capacitance sensor, a pressure sensor, or the like is used to connect the safety belt 50 to the safety bar 38 of the hook portion 53. You may make it detect engagement.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, an alarm is issued when the safety belt is not secured to the safety belt mounting portion. Therefore, the safety belt is attached to an operator who is in the cockpit of the picking forklift. Arouse and work in a safe state with a safety belt.
[0033]
According to the invention of claim 2, since the hook portion connected to the safety belt is movably engaged with the rod-like member, the safety belt moves freely along the rod-like member, thereby The work range of the worker who wears it becomes wide. The detecting means is an optical sensor including a light projecting unit that projects light from one end side of the rod-shaped member and a light receiving unit that receives light from the light projecting unit on the other end side. Regardless of the position of the member, it is possible to detect the engagement of the hook portion with the rod-like member, and accordingly, an alarm can be appropriately generated.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a picking forklift provided with a safety belt mounting device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a configuration for detecting a safety belt used in the picking forklift and its locked state.
FIG. 3 is an electrical block configuration diagram of a safety belt attaching device of the picking forklift.
[Explanation of symbols]
1 Picking forklift 10 Cockpit (cockpit)
38 safety bar (safety belt mounting part)
40 Fork 50 Safety belt 53 Hook part 70 Optical sensor (detection means)
70a Light projecting part 70b Light receiving part 82 Red patrol light (alarm means)
83 Voice alarm (alarm means)
100 Safety belt attachment device

Claims (2)

In a safety belt attaching device for tethering a safety belt attached to an operator who rides in a cockpit that can move up and down together with a fork of a picking forklift,
A safety belt mounting portion to which the safety belt is secured;
Detection means for detecting whether or not a safety belt is secured to the safety belt mounting portion;
An apparatus for attaching a safety belt for a picking forklift, comprising: alarm means for issuing an alarm when the safety belt is not locked based on a detection signal output from the detection means. The safety belt mounting portion is composed of a rod-like member to which a hook portion connected to the safety belt is movably engaged,
The detection means includes a light projecting unit that projects light from one end side of the rod-shaped member, and a light receiving unit that receives light from the light projecting unit on the other end side, and the hook unit is attached to the rod-shaped member. The picking forklift safety belt mounting device according to claim 1, wherein the optical sensor is a light sensor that blocks light when engaged.

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