JP2006036392A - Freight car lifting prevention device for forklift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent hanging up of a freight car by lifting a container by forklift when the container on the freight car is locked by fastening device. <P>SOLUTION: The freight car lifting prevention device for the forklift is provided with a camera 58 for photographing an operation member 29 of the fastening device 26; and an image processing device 60 for outputting the lock/unlock state of the fastening device 26 to a controller 62 as a discriminatable signal by performing the image processing based on the image from the camera. The controller 62 determines whether or not lifting of the container 18 is stopped based on the signal of the image processing device 60, it operates an unload valve 64 when the lifting up is stopped and it does not operate the unload valve 64 when the lifting up is not stopped. The lifting action of the fork 55 of the forklift 45 is stopped by operation of the unload valve 64. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wagon lifting prevention device for a forklift that prevents lifting of a freight car that is expected to occur when a container on a wagon is lowered.

  Conventionally, a container loaded on a freight car is transported to a destination while being locked by a tightening device. At the destination, for example, the operator of the forklift unlocks the tightening device and then lifts the container by the forklift and transports it to a predetermined place. An example of a tightening device that locks / unlocks a container on a freight car is disclosed in Patent Document 1, for example.

JP-A-57-86490

  By the way, the operator may forget to unlock the tightening device or neglect the confirmation of the unlocking state of the tightening device. In this way, if the operator lifts the container with the forklift while the tightening device is in the locked state, the freight car may be lifted together with the container.

  The problem to be solved by the present invention is to provide a freight car lift prevention device for a forklift that can prevent the lift of the freight car due to the lifting of the container by the forklift when the container on the freight car is locked by the tightening device. is there.

The above-described problem can be solved by a freight car lifting prevention device for a forklift that has the structure described in the claims.
That is, according to the freight car lifting prevention device for a forklift according to claim 1, the identification output from the state detecting means for detecting the lock / unlock state of the tightening device that locks the container loaded on the freight car. Based on the possible signal, the control means determines whether to stop lifting the container. Specifically, the control means determines that lifting of the forklift is not stopped if the tightening device is in the unlocked state, and determines that lifting of the forklift is stopped if the tightening device is in the locked state.
When the control means determines that lifting of the forklift is not stopped, the lift stopping means is not operated, so that the container can be lifted by the forklift.
Further, when the control means determines that the lifting of the forklift is to be stopped, the raising operation of the fork of the forklift is stopped by operating the raising and stopping means. Therefore, when the container on the freight car is locked by the tightening device, the container cannot be lifted by the forklift, so that the freight car can be prevented from being lifted.

According to the forklift anti-lifting device for forklifts according to claim 2 of the claims, in the state detecting means, the position of the camera provided on the forklift is changed according to the locking / unlocking state of the tightening device. Shoot the part. Then, the image processing device performs image processing based on the video from the camera and outputs the signal to the control means as a signal that can identify the locked / unlocked state of the fastening device.
Therefore, according to such a state detection means, it is not necessary to route wiring between the freight car and the forklift, and it is not necessary to equip the wagon with special parts.
In addition, if the forklift is within a distance that the receiving device can receive the signal from the transmitting device, the state detecting means can be operated, so that the fork of the forklift need not be inserted into the fork pocket.

According to the freight car lift prevention device for a forklift according to claim 3, the position detection sensor provided on the freight car is changed in position in accordance with the locking / unlocking state of the tightening device. The position of the position changing member is detected and output to the transmitting device as a signal capable of identifying the position. Upon receiving the signal from the position detection sensor, the transmission device transmits a signal corresponding to the signal from the position detection sensor. The receiving device provided on the forklift receives a signal transmitted from the transmitting device, and outputs the signal to the control means as a signal that can identify the locked / unlocked state of the tightening device based on the signal.
Therefore, according to such a state detection means, it is not necessary to route wiring between the freight car and the forklift.

According to the freight car lifting prevention device for a forklift according to claim 4 of the claims, in the tightening device, the lock arm operatively supported by the support member provided in the freight car is operated by the operation member. The container hook is locked and unlocked by the operation of the lock arm.
The operation member as the position changing member is a member whose position is changed according to the locking / unlocking state of the tightening device, and the operation amount required for the position change is larger than that of the lock arm. can do.

  Moreover, according to the forklift freight car lifting prevention device according to claim 5 of the claims, the state detecting means and / or the control means can be arbitrarily turned on and off by operating the operation switch by the forklift operator. it can. Therefore, when the freight car lifting prevention device is not used, malfunction of the device can be prevented or reduced.

According to the forklift freight car lifting prevention device according to claim 6 of the claims, the unload valve incorporated between the oil pump and the oil control valve in the hydraulic circuit of the forklift is in a normal state (load state). In some cases, the fork of the forklift can be lifted by supplying hydraulic oil to the oil control valve by the oil pump.
Further, when the unload valve is operated in the unload state, the hydraulic oil fed by the oil pump is returned to the oil tank, so that the fork lift operation of the forklift is stopped.
Then, according to the unload valve incorporated in the hydraulic circuit of the forklift, it is possible to easily configure the rising stop means.

  According to the forklift freight car lifting prevention device of the present invention, when the container on the freight car is locked by the tightening device, the lifting of the freight car can be prevented or reduced by stopping the lifting of the container by the forklift.

  Next, the best mode for carrying out the present invention will be described with reference to examples.

A first embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, explanation will be made in the order of a freight car, a forklift, and a freight car lifting prevention device.
First, the freight car will be described. FIG. 1 is an explanatory diagram showing the relationship between a container loaded on a freight car and a forklift.
As shown in FIG. 1, the freight car 10 is disposed so as to be able to travel on two right and left rails 12 laid on the track.
The freight car 10 includes a gantry 14 on which a container 18 (to be described later) can be loaded, and a plurality of sets (one set in FIG. 1) that is movably mounted on both rails 12 and supports the gantry 14 via a suspension device 15. The wheel 16 is provided.
A box-shaped container 18 can be loaded on the gantry 14. As is well known, when the container 18 is loaded on the gantry 14, a so-called fork pocket 19 is formed between the gantry 14 and the container 18 so that a fork 55 of a forklift 45 (described later) can be inserted. The

A pair of left and right container hooks 20 project left and right symmetrically at the center of the lower surface of the container 18 in the front-rear direction (the front and back direction in FIG. 1). 4A and 4B show the unlocking state of the tightening device, where FIG. 4A is an external perspective view, and FIG. 4B is a perspective view viewed from the inside.
As shown in FIG. 4 (a), the container hook 20 is formed in a substantially strip shape, and protrudes downward with its thickness direction directed in the left-right direction. The container hook 20 has a pair of front and rear engaging recesses 22 formed symmetrically on both front and rear sides, and a tapered insertion end 23 formed on the lower end thereof. Note that the upper and lower convex portions 24 are continuous with a gentle curved surface above and below the both engaging concave portions 22. Further, the front and rear convex portions 24 and the insertion end portion 23 located on the lower side are continuous with a gentle curved surface.

  As shown in FIGS. 4A and 4B, a pair of left and right tightening devices 26 capable of locking and unlocking both the container hooks 20 are symmetrically disposed on the gantry 14. . Since the pair of tightening devices 26 are configured symmetrically, for example, the right tightening device 26 will be described, and the description of the left tightening device 26 will be omitted. 5A and 5B show a locked state of the tightening device, where FIG. 5A is an external perspective view, and FIG. 5B is a perspective view seen from the inside.

As shown in FIGS. 4B and 5B, the tightening device 26 includes a support member 27, a pair of front and rear lock arms 28, and an operation member 29.
The support member 27 is fixed on the gantry 14, and includes a main plate portion 31 and front and rear side plate portions 32 bent leftward from the front and rear side edges of the main plate portion 31. As shown in FIG. 4A, a support hole 33 is formed in the central portion of the main plate portion 31.

  As shown in FIGS. 4B and 5B, the pair of front and rear lock arms 28 are symmetrically arranged on the inner side (left side) of the main plate portion 31 of the support member 27 via the front and rear support shafts 35. It is rotatably supported. Both lock arms 28 have an engaging convex part 37 formed at the upper part thereof so as to project in the opposite direction, and a cam follower part 38 formed at the lower end part thereof. Engaging projections 37 of both lock arms 28 are formed so as to be engageable with both engaging recesses 22 of the container hook 20 (see FIG. 5B). The cam follower portions 38 of the lock arms 28 are formed so as to be slidable in contact with both front and rear edges of a cam portion 41 (described later) of the operation member 29.

The operation member 29 is supported by a support member (not shown) so as to be movable in the axial direction (left-right direction) in a horizontal state with respect to the support member 27.
The operation member 29 is used when the operation portion 40 (see FIGS. 4A and 5B) fitted in the support hole 33 of the support member 27 and the container hook 20 are locked (see FIG. 5B). ) Is interposed between the cam follower portions 38 of both lock arms 28 and is disposed between the lock arm 28 and the main plate portion 31 when the container hook 20 is unlocked (see FIG. 4B). 41. The cam portion 41 has a wide portion 42 (see FIG. 5B) that widens the lateral width (width in the front-rear direction) and a narrow portion 43 that narrows the lateral width.
And when the operation part 40 of the operation member 29 exists in the protrusion position pulled out from the support hole 33 of the support member 27 as shown to Fig.4 (a), as shown in FIG.4 (b). In addition, the narrow portion 43 of the cam portion 41 corresponds to the space between the cam follower portions 38 of the lock arms 28. As a result, both lock arms 28 are in a state of releasing the engaging projections 37, that is, in an unlocked state.
Further, when the operation portion 40 of the operation member 29 is in the pushed-in position pushed into the support hole 33 of the support member 27 as shown in FIG. 5A, as shown in FIG. 5B. Further, the wide portion 42 of the cam portion 41 corresponds to the space between the cam follower portions 38 of the lock arms 28. Thereby, both the lock arms 28 are in a state of closing the engagement convex portion 37, that is, in a locked state.
Note that the left and right tightening devices 26 are configured to be operated in synchronization with the operation of one operation member 29. Both lock arms 28 are always urged in the unlocking direction by a spring member (not shown).

By the way, when the container 18 is loaded on the base 14 (see FIG. 1) of the freight car 10, the tightening device 26 is unlocked, that is, the operation member 29 is in the protruding position, and both lock arms 28 of the tightening device 26 are engaged. The interlocking portion 37 is unlocked (see FIGS. 4A and 4B).
In this state, when the container 18 is loaded on the mount 14 of the freight car 10, the container hook 20 is interposed between the lock arms 28 of the tightening device 26. In this state, as shown in FIG. 5A, when the operating member 29 is moved to the pushed-in position, the wide portion 42 of the cam portion 41 corresponds to the space between the cam follower portions 38 of both lock arms 28, and both lock arms 28 is rotated around the support shaft 35 (see FIG. 5B). For this reason, it will be in the locked state which the engagement convex part 37 of both the lock arms 28 engaged with both the engagement recessed parts 22 of the container hook 20. FIG. As a result, the container 18 is fixed on the gantry 14.

  In the locked state of the tightening device 26, as shown in FIG. 4A, when the operating member 29 is pulled out to the protruding position, the narrow portion 43 of the cam portion 41 is located between the cam follower portions 38 of both lock arms 28. Correspondingly, both lock arms 28 are rotated around the support shaft 35 (see FIG. 4B). For this reason, the engagement projections 37 of both lock arms 28 are in an unlocked state in which both engagement recesses 22 of the container hook 20 are released. As a result, the container 18 can be lifted upward from the freight car 10 (specifically, the gantry 14).

Next, an outline of the forklift 45 that performs the cargo handling operation of the container 18 will be described.
As shown in FIG. 1, the vehicle body 46 of the forklift 45 can be driven by a total of four wheels 47 (front and rear, two are shown in the front and rear). A cabin 48 is provided on the vehicle body 46. A driver's seat (not shown) on which an operator who operates the forklift 45 is seated is provided in the cabin 48.

A mast device 50 is provided at the front of the vehicle body 46. The mast device 50 includes a fixed mast member 51 and a movable mast member 52 that can be moved up and down along the fixed mast member 51. A lift bracket 54 having a pair of left and right forks 55 (see FIG. 2A) is provided on the movable side mast member 52 so as to be movable up and down. FIG. 2 shows a lift bracket, where (a) is a front view and (b) is a side view.
Both forks 55 (see FIG. 2A) can be inserted into a fork pocket 19 (see FIG. 1) between the gantry 14 and the container 18 and are lifted together with the lift bracket 54 to move the container 18. Can be lifted. Both forks 55 are hooked on the upper and lower fork bars 56 of the lift bracket 54.

Next, the freight car lift prevention device of the forklift 45 will be described.
As shown in FIG. 2A, a camera 58 is attached to a central portion of the lower fork bar 56 via the bracket 59 (see FIG. 2B).
The camera 58 is provided so as to be able to photograph the fastening device 26 (see FIG. 1) that faces the fork 55 inserted into the fork pocket 19 between the gantry 14 of the freight car 10 and the container 18. Specifically, the camera 58 is provided so as to be able to photograph the operation portion 40 (see FIGS. 4A and 5A) of the operation member 29 protruding from the support hole 33 of the support member 27. The operation member 29 corresponds to a “position changing member” in this specification.

FIG. 3 is an explanatory view showing a freight car lifting prevention device of a forklift. As shown in FIG. 3, the camera 58 is electrically connected to the image processing apparatus 60 via electrical wiring (reference number omitted). The image processing device 60 performs image processing based on the video from the camera 58 and outputs the signal to the controller 62 as a signal that can identify the locked / unlocked state of the tightening device 26. The image processing device 60 and the controller 62 are provided in the cabin 48 of the forklift 45, for example.
The camera 58 and the image processing apparatus 60 constitute “state detection means” as used in this specification. The controller 62 corresponds to a “control unit” in this specification.

The controller 62 is electrically connected to the image processing device 60 through electrical wiring (reference number omitted), and stops lifting the container 18 by the forklift 45 based on a signal output from the image processing device 60. It is determined whether or not. That is, the controller 62 lifts the forklift 45 if the tightening device 26 is in the unlocked state (see FIGS. 4A and 4B) based on the identifiable signal output from the image processing device 60. It is determined not to stop, and if the tightening device 26 is in a locked state (see FIGS. 5A and 5B), it is determined that lifting of the forklift 45 is stopped.
The controller 62 operates an unload valve 64 (described later) when the lifting is stopped, and does not operate the unload valve 64 when the lifting is not stopped.

As shown in FIG. 3, between the oil pump 66 and the oil control valve 67 in the hydraulic circuit 65 of the forklift 45, there is an electromagnetic unload valve 64 for returning to an oil tank (not shown). It is incorporated. The oil pump 66 is driven by the engine 68.
The unload valve 64 is electrically connected to the controller 62 through electrical wiring (reference numeral omitted). When the unload valve 64 is actuated by the controller 62, the hydraulic oil sent from the oil pump 66 is returned to the oil tank (not shown) through the return oil passage 64a, thereby operating the oil control valve 67. Stop oil supply. Thereby, the raising operation of the fork 55 of the forklift 45 is stopped. The unload valve 64 corresponds to the “rising stop means” in this specification.

Further, if the camera 58, the image processing device 60, and the controller 62 are operated while the fork 55 of the forklift 45 is being inserted into the fork pocket 19 (see FIG. 1), it is expected that the freight car lifting prevention device will malfunction. .
Therefore, an electric switch including the camera 58, the image processing device 60, and the controller 62 incorporates an operation switch 69 that turns on and off the operations of the camera 58, the image processing device 60, and the controller 62. . The operation switch 69 is disposed in the cabin 48 of the forklift 45 so as to be operable by an operator sitting in the cabin 48, and is turned on / off as necessary. The operation switch 69 may be any switch that turns on or off at least one of the camera 58, the image processing apparatus 60, and the controller 62.

Next, the operation of the freight car lifting prevention device of the forklift 45 will be described.
Now, as shown in FIG. 1, it is assumed that a container 18 is loaded on a mount 14 of a freight car 10 stopped on a rail 12. In this state, the operator causes the forklift 45 to travel toward one side surface (for example, the right side surface) of the freight car 10 and inserts the fork 55 into the fork pocket 19 between the gantry 14 and the container 18. In this state, the operator turns on the operation switch 69 (see FIG. 3).
Then, the camera 58 images the operation unit 40 (see FIGS. 4A and 5A) of the operation member 29 in the tightening device 26. Accordingly, the image processing device 60 performs image processing based on the video from the camera 58, and outputs the signal to the controller 62 as a signal that can identify the locked / unlocked state of the tightening device 26. FIG. 6 is a flowchart showing control by the controller.

  Based on the signal from the image processing device 60, the controller 62 determines whether to stop lifting the container 18 (see step S1 in FIG. 6). Specifically, the controller 62 determines that the lifting of the forklift 45 is not stopped if the tightening device 26 is in the unlocked state (see FIGS. 4A and 4B), and the tightening device 26 is in the locked state (FIG. 5). If (see (a), (b)), it is determined that lifting of the forklift 45 is stopped.

  When the controller 62 determines not to stop lifting the forklift 45, the unload valve 64 is not operated. For this reason, by supplying hydraulic oil from the oil pump 66 to the oil control valve 67, the fork 55 of the forklift 45 can be lifted (see step S2 in FIG. 6). Therefore, the container 18 can be lifted by the forklift 45 and a predetermined cargo handling operation can be performed.

In addition, when the controller 62 determines to stop lifting the forklift 45, the unload valve 64 is operated (see step S3 in FIG. 6). Then, the hydraulic oil to be supplied from the oil pump 66 to the oil control valve 67 is returned from the unload valve 64 to the oil tank (not shown) through the return oil path 64a. Thereby, the raising operation | movement of the fork 55 of the forklift 45 is stopped (refer step S4 of FIG. 6). Therefore, when the container 18 on the freight car 10 is locked by the tightening device 26, the container 18 cannot be lifted by the forklift 45.
At this time, if the tightening device 26 is brought into the unlocked state by pulling out the operating portion 40 of the operating member 29 of the tightening device 26, the container 18 is lifted by the forklift 45 and the predetermined loading / unloading work is performed as described above. Can be performed.

  According to the above-described freight car lift prevention device for the forklift 45, when the container 18 on the freight car 10 is locked by the tightening device 26 (see FIGS. 5A and 5B), the forklift 45 holds the container 18. I can't raise it. Thereby, lifting of the freight car 10 can be prevented or reduced.

  Further, according to the state detection means (reference numeral omitted) constituted by the camera 58 and the image processing device 60, it is not necessary to route wiring between the freight car 10 and the forklift 45, and the freight car 10 is not equipped with special parts. It's okay.

  The operation member 29 of the tightening device 26 (see FIGS. 4A and 4B and FIGS. 5A and 5B) is a member whose position is changed when the tightening device 26 is locked or unlocked. In addition, the amount of operation for changing the position is larger than that of the lock arm 28. For this reason, it can be easily detected by the state detection means constituted by the camera 58 and the image processing device 60.

  Further, when the operator of the forklift 45 operates the operation switch 69 (see FIG. 3), the camera 58, the image processing device 60, and the controller 62 can be arbitrarily turned on / off. Therefore, when the freight car lifting prevention device is not used, malfunction of the device can be prevented or reduced.

  Further, according to the unload valve 64 (see FIG. 3) incorporated in the hydraulic circuit 65 of the forklift 45, the rising stop means can be easily configured.

A second embodiment of the present invention will be described. FIG. 7 is an explanatory view showing a wagon lifting prevention device. In this embodiment, since the state detection means (see FIG. 3) configured to include the camera 58 and the image processing device 60 in the first embodiment is changed, the changed portion will be described in detail and overlapped. The description to be omitted is omitted.
As shown in FIG. 7, the state detection unit according to the second embodiment includes a position detection sensor 71, a transmission device 72, and a reception device 74.
The position detection sensor 71 is attached to the side plate portion 32 of the support member 27 of the tightening device 26 provided on the mount 14 of the freight car 10 via a stay 76. The position detection sensor 71 is a proximity switch that detects the position of the operating member 29 that is moved in accordance with the locking / unlocking state of the tightening device 26 and outputs the position as a signal that can be identified. For example, the proximity switch detects the protrusion 30 of the operation member 29 in the locked state and does not detect the protrusion 30 in the unlocked state.

The transmission device 72 is provided on the gantry 14 of the freight car 10 (see FIG. 1). The transmission device 72 transmits a signal based on the signal output from the position detection sensor 71. The transmitting device 72 and the position detection sensor 71 are incorporated in an electric circuit (not shown) provided on the freight car 10 side.
The receiving device 74 is provided in the cabin 48 of the forklift 45, for example. The receiving device 74 receives the signal transmitted from the transmitting device 72 and outputs the signal to the controller 62 as a signal that can identify the locked / unlocked state of the tightening device 26 based on the signal. The receiving device 74 is incorporated in an electric circuit (not shown) including the controller 62 of the forklift 45.

The operation of the freight car lifting prevention device of the forklift 45 provided with the state detection means according to this embodiment will be described.
As shown in FIG. 1, in the state where the container 18 is loaded on the gantry 14 of the freight car 10 stopped on the rail 12, the operator moves the fork 55 of the forklift 45 between the gantry 14 and the container 18. Insert into the fork pocket 19 (see FIG. 1). In this state, the operator turns on the operation switch 69. At this time, the transmitting device 72 is in an on state.
Then, as shown in FIG. 7, the position detection sensor 71 provided in the freight car 10 can detect the position of the operation member 29 whose position is changed according to the locking / unlocking state of the tightening device 26 and identify the position. To the transmitter 72 as a simple signal. Upon receiving the signal from the position detection sensor 71, the transmission device 72 transmits a signal corresponding to the signal from the position detection sensor 71.
The receiving device 74 provided on the forklift 45 receives the signal transmitted from the transmitting device 72 and outputs the signal to the controller 62 as a signal that can identify the locked / unlocked state of the fastening device 26 based on the signal. To do.

  Then, the controller 62 determines whether or not to stop lifting the container 18 based on the signal from the receiving device 74 (see step S1 in FIG. 6). When the controller 62 determines not to stop the lifting of the forklift 45, the fork 55 of the forklift 45 can be lifted because the unload valve 64 is not operated as described above (see step S2 in FIG. 6). ). Therefore, the container 18 can be lifted by the forklift 45 and a predetermined cargo handling operation can be performed.

  When the controller 62 determines that the lifting of the forklift 45 is to be stopped, the unload valve 64 is operated as described above (see step S3 in FIG. 6). Thereby, the raising operation | movement of the fork 55 of the forklift 45 is stopped (refer step S4 of FIG. 6). Therefore, when the container 18 on the freight car 10 is locked by the tightening device 26, the container 18 cannot be lifted by the forklift 45.

The same operation and effect as in the first embodiment can also be obtained by the freight car lift prevention device of the forklift 45 described above.
Further, according to the state detection means configured to include the position detection sensor 71, the transmission device 72, and the reception device 74 of the present embodiment, it is not necessary to route wiring between the freight car 10 and the forklift 45.
Further, if the forklift 45 is within the distance that the receiving device 74 can receive the signal of the transmitting device 72, the state detecting means can be operated, so that the fork 55 of the forklift 45 need not be inserted into the fork pocket 19. There is no problem.

The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention.
For example, turning on the state detection means and / or the control means is not limited to manual operation. For example, the control means is programmed so that the camera can recognize the tightening device, and the camera recognizes the tightening device. In this case, the state detection unit and / or the control unit may be automatically turned on.
Further, the structure of the tightening device, the state detecting means, and the rise stopping means are not limited to those described in the embodiments, and any means can be used as long as it can detect the locking / unlocking of the tightening device and can stop the lifting of the fork. The thing of such a structure may be sufficient. For example, a mechanism that locks the operation lever, for example, may be used as the ascending stop means instead of the unload valve.
Further, the wide portion 43 and the narrow portion 42 of the operation member 29 may be reversed. In this case, the locked state is when the operating portion 40 protrudes, and the unlocked state is when it does not protrude.

It is explanatory drawing which shows the relationship between the container loaded in the freight car concerning Example 1 of this invention, and a forklift. The lift bracket is shown, (a) is a front view and (b) is a side view. It is explanatory drawing which shows the wagon lifting prevention apparatus of a forklift. FIGS. 2A and 2B show an unlocked state of the tightening device, in which FIG. 1A is an external perspective view, and FIG. FIGS. 2A and 2B show a locked state of the tightening device, in which FIG. 1A is an external perspective view, and FIG. It is a flowchart which shows the control by a controller. It is explanatory drawing which shows the wagon lifting prevention apparatus of the forklift truck concerning Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Freight car 18 Container 20 Container hook 26 Tightening device 27 Support member 28 Lock arm 29 Operation member (position change member)
45 forklift 55 fork 58 camera (part of state detection means)
60 Image processing device (part of state detection means)
62 Controller (control means)
64 Unload valve (rising stop means)
65 Hydraulic circuit 66 Oil pump 67 Oil control valve 69 Operation switch 71 Position detection sensor (part of state detection means)
72 Transmission device (part of status detection means)
74 Receiver (part of status detection means)

Claims (6)

State detecting means for detecting a locking / unlocking state of a tightening device that locks a container loaded on a freight car and outputting the state as an identifiable signal;
Lift stopping means capable of stopping the lift operation of the fork of the forklift,
It is determined whether or not to stop the lifting of the container by the forklift based on the signal of the state detecting means, and when the lifting is stopped, the lifting stopping means is operated, and when the lifting is not stopped, the lifting is stopped. And a control means for preventing the stop means from being actuated. The freight car lifting prevention device for a forklift according to claim 1,
The state detection means includes a camera that is provided on the forklift and changes a position according to a locking / unlocking state of the tightening device, and performs image processing based on video from the camera. An apparatus for preventing lifting of a freight car of a forklift, comprising: an image processing device that outputs to the control means a signal that can identify a locked / unlocked state of the tightening device. The freight car lifting prevention device for a forklift according to claim 1,
A position detection sensor that detects a position of a position changing member that is provided in the freight car and that changes position according to the locking / unlocking state of the tightening device, and outputs the position as a identifiable signal; A transmitting device that transmits a signal based on a signal output from the position detection sensor; and a signal that is provided on the forklift and that is transmitted from the transmitting device and locks the tightening device based on the signal. A freight car lifting prevention device for a forklift, comprising: a receiving device that outputs the unlocked state as a signal that can be identified to the control means. A freight car lifting prevention device for a forklift according to claim 2 or 3,
The tightening device includes a support member provided on the freight car, a lock arm that is operatively supported by the support member and that locks and unlocks a container hook included in the container by the operation, and operates the lock arm. An operation member,
A freight car lifting prevention device for a forklift, wherein the operation member is the position changing member. A freight car lifting prevention device for a forklift according to any one of claims 1 to 4,
A forklift freight car lifting prevention device comprising an operation switch operable by an operator of the forklift and capable of turning on and off the state detection means and / or the control means. A freight car lifting prevention device for a forklift according to claim 1,
The ascending stop means is an unload valve that is incorporated between an oil pump and an oil control valve in the hydraulic circuit of the forklift and returns hydraulic oil supplied from the oil pump to the oil control valve by operation to the oil tank. A forklift anti-lifting device for forklifts.

Images