JP2014061986A - Fall prevention device for picking lift and picking lift including the fall prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device capable of preventing an operator who tries to perform picking work from falling effectively, and a picking lift including the fall prevention device.SOLUTION: A fall prevention device includes: a guard part 17; guard part moving means capable of moving the guard part to a proximity position and to a separation position; display means 18 fixed at the guard part and capable of displaying a display screen for presenting a safety condition of picking work to an operator; a pallet detection sensor 21; and a control part for controlling the guard part moving means and the display means based on a detection result of the pallet detection sensor. The control part makes the position of the guard part as a proximity position when a fork is not inserted into a pallet, while it makes the position of the guard part as a separation position when the fork is inserted into the pallet, and also, it makes a display screen when the fork is not inserted into the pallet and a display screen when the fork is inserted into the pallet different.

Description

  The present invention relates to a fall prevention device that prevents an operator who has boarded a cab of a picking lift from falling, and a picking lift including the fall prevention device.

As a forklift used in a factory warehouse or the like, for example, as shown in FIG. 13, a vehicle main body 2 incorporating a battery, a traveling motor (both not shown), etc., and a mast provided behind the vehicle main body 2 There is known a picking lift 100 including 3 and a cab 4 that moves up and down along the mast 3.
The cab 4 of the picking lift 100 includes a step 10, a head guard 12 that covers the overhead of an operator (not shown) that has boarded the step 10, and a pair of forks extending rearward from the rear end portion 10 </ b> B of the step 10. 13 and an operation panel 14 provided in front of the operator. The fork 13 is inserted into the pallet P.

  The left and right side end portions 12L and 12R of the head guard 12 are vertical surfaces including the rear end portion 10B of the step 10 from the upper end portion of each column erected at the front corner portion of the step 10 to the rear (step 10). From the rear corner to the plane including the lines Y1 and Y2 extending upward).

  By the way, in the cargo handling work by the picking lift 100, the operator operates the operation panel 14 to move the cab 4 with the operator to a high place as shown in FIG. The picking operation of moving the load (not shown) loaded on the pallet P to the rack or moving the load stored in the rack onto the pallet P is included. For this reason, the cab 4 of the picking lift 100 is provided with a fall prevention device (see the safety guard 15 in FIG. 13) for preventing the operator from falling.

  According to the safety guard 15, the operator's waist around the step 10 is surrounded, so the operator operating the operation panel 14 accidentally steps out of the step 10 and falls from the step 10 Can be prevented. However, the safety guard 15 cannot prevent the operator performing the picking operation on the pallet P from falling.

Moreover, the thing of patent document 1 is also known as a conventional fall prevention apparatus.
The fall prevention device described in Patent Document 1 is a pallet upper space above the pallet P (a space formed by the lines Y3 and Y4 extending upward from the rear corner of the pallet P and the lines Y1 and Y2). Are provided with safety guards (not shown in FIG. 13) that surround the side surfaces and rear surfaces of the upper surface and the side surfaces of the upper step space above step 10 (the space between step 10 and head guard 12).
According to this fall prevention device, not only the operator who is operating the operation panel 14 but also the operator who is performing the picking work on the pallet P can be prevented from falling.

Japanese Patent No. 4001337

However, the conventional fall prevention device can prevent the operator who performs the picking work from falling from the pallet P, but the pallet P does not exist (the fork 13 is not inserted into the pallet P). An unexpected fall from the operator's step 10 could not be prevented.
That is, at the time of picking work, the operator needs to transfer to the pallet P from step 10, but in the fall prevention device described in Patent Document 1, the operator lowers the safety guard to improve the safety of the rear and side of the space above the pallet. Even if it is secured, even if the pallet P does not exist, it is prevented that an operator who tries to transfer to the pallet P without noticing it falls from the rear end portion 10B of the step 10 to the rear. I couldn't.

  The present invention has been made in view of the above circumstances, and the problem is that the fall prevention device and the fall prevention device can effectively prevent the operator who wants to perform the picking work from falling down. It is in providing a picking lift provided with.

In order to solve the above problems, the present invention includes (1) a step, a head guard that covers the overhead of an operator who has boarded the step, and a pair of forks extending rearward from the rear end of the step. In the picking lift provided with a cab that can be moved up and down, a fall prevention device for preventing the operator from falling down, wherein the guard part and the guard part are close to the rear end part of the head guard. And a guard part moving means that can be moved to a rearward position away from the rear end part, and a display that is fixed to the guard part and can display a display screen for presenting the safety status of the picking work to the operator Means, a pallet detection sensor for detecting whether or not the fork is inserted into the pallet, and a detection result of the pallet detection sensor, A control unit that controls the guard unit moving unit and the display unit, and the control unit sets the position of the guard unit as the proximity position when the fork is not inserted into the pallet. When the fork is inserted into the pallet, the position of the guard portion is set to the separated position, and the fork is not inserted into the pallet and the fork is inserted into the pallet. Thus, the fall prevention device is characterized in that the display screen is a different screen.
In this configuration, the position of the guard part and the display screen of the display means change depending on whether or not the fork is inserted into the pallet. More specifically, when the fork is not inserted into the pallet, the position of the guard part is changed. On the other hand, when the fork is inserted into the pallet, the position of the guard part is set to the separated position, and the fork is not inserted into the pallet and the fork is inserted into the pallet. Thus, the display screen is different.
Therefore, according to this configuration, it is possible for an operator who performs a picking operation to perform a picking operation depending on whether the guard unit is near or far away, and by changing the display screen to a different screen, that is, by a synergistic effect thereof. The presence or absence of the pallet can be surely noticed, and the operator can be effectively prevented from falling.

  In the configuration (1), it is preferable that (2) the control unit changes the display screen to a different screen by changing at least one of a color, a character, a figure, a symbol, a pattern, a picture, and a moving image.

In the configuration (1) or (2), (3) the display screen further includes a traveling state of the picking lift, a lifting / lowering state of the cab, a loading state of a load on the pallet, and the picking Preferably, at least one of the operating conditions of the lift-equipped equipment is presented.
According to this configuration, the display screen displays not only the picking work safety status, but also the picking lift travel status, the cab lifting / lowering status, the loading status of the load on the pallet, and the operating status of the equipment mounted on the picking lift. Since at least one is presented, other useful information other than safety information for preventing the operator from falling can be provided to the operator.

In any one of the above-described configurations (1) to (3), (4) the guard part moving means extends and retracts in the front-rear direction, and a slide-type roof that is slidable in the front-rear direction with respect to the head guard. And a guard member is attached to a rear end portion of the sliding roof, and one end portion and the other end portion of the stretching member are fixed to the head guard and the sliding roof, respectively, and the control Preferably, the part moves the guard part between the proximity position and the separation position by expanding and contracting the expansion and contraction member and sliding the sliding roof based on a detection result of the pallet detection sensor. .
According to this configuration, since the telescopic member expands and contracts and the sliding roof slides in the front-rear direction based on the detection result of the pallet detection sensor, the guard portion can automatically move between the proximity position and the separation position. It becomes.

In the configuration (4), it is preferable that (5) the expandable member is a power cylinder.
According to this configuration, since the power cylinder is particularly excellent in controllability among the elastic members, the guard portion can be reliably and smoothly moved between the separation position and the proximity position.

In any one of the above-described configurations (1) to (5), (6) a lift height detection sensor that detects the lift height of the cab is further provided, and the control unit detects a detection result of the pallet detection sensor and the lift height. The display screen is preferably a different screen based on the lift detected by the detection sensor.
By the way, the danger of the operator falling during the picking operation changes depending on the lift height of the cab. For example, if the pallet is not present and the lift height is high, the operator may fall. However, when the lift is low, it is not necessary for the operator to recognize the risk of falling excessively.
According to this configuration, since the display screen of the display means is different based on the height of the cab, the operator can determine the risk of falling according to the height of the cab using the display screen. can do.

In any one of the above configurations (1) to (6), (7) an audio output unit capable of outputting audio is further provided, and the control unit is configured to output from the audio output unit according to the display screen of the display unit. It is preferable to output the different sounds.
According to this configuration, since the voice of the voice output unit changes according to the display screen, the operator can make the operator surely recognize the danger of falling by a visual and auditory synergistic effect, and the operator's falling Can be effectively prevented.

  Moreover, in order to solve the said subject, this invention is made into the picking lift characterized by including the fall prevention apparatus in any one of (8) said structure (1)-(7).

  ADVANTAGE OF THE INVENTION According to this invention, the picking lift provided with the fall prevention apparatus which can prevent effectively that the operator who performs picking work falls, and this fall prevention apparatus can be provided.

It is a side view of the picking lift provided with the fall prevention device concerning the 1st example of the present invention, and is a figure showing the state where the guard part moved to the separation position. It is a side view of the picking lift which concerns on 1st Example, and is a figure which shows the state which the guard part moved to the proximity position. It is a top view explaining the guard part moving means and the movement of the guard part of the picking lift according to the first embodiment, (A) is the state where the guard part is moved to the separation position, (B) is the guard part is in the proximity position It is a figure which shows the state which moved. It is a figure which shows the head guard of the picking lift which concerns on 1st Example, and its periphery, (A) is a top view, (B) is a rear view of (A), (C) and (D) are (B). FIG. It is a block diagram regarding control of the picking lift which concerns on 1st Example. It is a flowchart explaining operation | movement of the control part of the picking lift which concerns on 1st Example. (A)-(E) are figures which show an example of the display screen displayed on the display means of the picking lift which concerns on 1st Example. It is a side view of the picking lift provided with the fall prevention device concerning the 2nd example of the present invention, and is a figure showing the state where the guard part moved to the separation position. It is a block diagram regarding control of the picking lift which concerns on 2nd Example. It is a flowchart explaining operation | movement of the control part of the picking lift which concerns on 2nd Example. (A)-(E) are figures which show an example of the display screen displayed on the display means of the picking lift which concerns on 2nd Example. (A)-(D) are figures which show the other example of the display screen displayed on the display means of the picking lift which concerns on this invention. It is a perspective view of the picking lift provided with the conventional fall prevention device, and is a figure showing the state where a cab is in a high place.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a picking lift fall prevention device and a picking lift equipped with the fall prevention device according to the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
As shown in FIGS. 1 and 2, the picking lift 1A according to the present invention is a vehicle main body 2 incorporating a battery, a driving motor (none of which are not shown), etc., as in the conventional picking lift 100 (see FIG. 13). And a mast 3 provided behind the vehicle body 2 and a cab 4 that moves up and down along the mast 3.

  The driver's cab 4 includes a step 10, a head guard 12 that covers the head of an operator (not shown) boarding the step 10, and a pair of left and right support members 11 (11 </ b> L and 11 </ b> R) that support the head guard 12 by sandwiching the head guard 12 from both left and right sides. A pair of forks 13 extending rearward from the rear end portion 10B of step 10, an operation panel 14 for operating the picking lift 1A, and a safety guard 15 for restricting the movement of the operator on step 10 The brake pedal 20 provided in step 10 is included.

  The operation panel 14 is provided between the support members 11L and 11R, and includes various operation means for causing the picking lift 1A to travel in an arbitrary direction and for raising and lowering the cab 4, for example. As an example of the operation means, there are a key switch 14a, an accelerator lever 14b, a lift switch 14c, and the like.

1 to 4, the picking lift 1A according to the present invention includes a guard part 17, a guard part moving means, a display means 18, a pallet detection sensor 21, and a control part 22A. A fall prevention device is further provided. 3A and 4A are the same drawing.
The guard part moving means is capable of moving the guard part 17 to a proximity position close to the rear end part 12B of the head guard 12 and a separation position farther away from the rear end part 12B. As described above, the sliding roof 16 is provided so as to be slidable in the front-rear direction with respect to the head guard 12, and the telescopic member 19 expands and contracts in the front-rear direction.

  As shown in FIGS. 3 and 4, the sliding roof 16 and the head guard 12 are vertically provided between the support members 11 </ b> L and 11 </ b> R. The head guard 12 is fixed to the lower portion of each inner wall (particularly see FIG. 4B) extending in the front-rear direction of the support members 11L and 11R by a fixing tool such as a bolt or any fixing means such as welding. Yes. A guide rail portion 11G (in particular, see FIGS. 4C and 4D) having a substantially C-shaped cross section is provided in the front-rear direction on the upper portion of each inner wall extending in the front-rear direction of the support members 11L, 11R. Yes. Slide portions 16G such as guide rollers that slide freely by engaging with the guide rail portions 11G of the support members 11L and 11R are provided on the side end portions 16L and 16R of the sliding roof 16 in the front-rear direction. In addition, it is preferable that the slide part 16G is formed longer than this guide rail part 11G so that it may not drop from the guide rail part 11G.

  The guard portion 17 is made of, for example, a metal frame (fence), and is attached to the rear end portion 16B of the sliding roof 16 by a fixing tool such as a fixing pin or any fixing means such as welding. That is, the upper end portion of the guard portion 17 is fixed to the rear end portion 16B of the sliding roof 16 as shown in FIG. A lower end portion of the guard portion 17 is disposed below the rear end portion 16 </ b> B of the sliding roof 16. As shown in FIGS. 1 and 2, the guard portion 17 extends from the rear end portion 16B of the sliding roof 16 to the vicinity of the height at which the operation panel 14 is located (up to the vicinity of the eye level of the operator standing at step 10). Although extending downward, it is not limited to this, and it goes without saying that the vertical length of the guard portion 17 can be adjusted as appropriate.

  The display means 18 is fixed to the guard portion 17 by a fixing tool such as a fixing pin or an arbitrary fixing means such as welding. As will be described later, the display means 18 is composed of a liquid crystal display capable of displaying a display screen for presenting the safety status of the picking work to the operator, but is composed of a display other than the liquid crystal display (for example, an organic display). May be.

  As shown in FIGS. 3 and 4, for example, the elastic member 19 includes a power cylinder 19 having a cylindrical storage case 19a and a rod 19b that can protrude from the storage case 19a. The storage case 19a is fixed to the front portion of the head guard 12 by, for example, a fixing tool such as a fixing pin or any fixing means such as welding. One end of the rod 19b is fixed to the head guard 12 via the storage case 19a by an arbitrary fixing means, and the other end of the rod 19b is fixed to the rear portion of the sliding roof 16 by an arbitrary fixing means. ing.

  In this embodiment, the pallet detection sensor 21 includes, for example, a sensor that detects the presence or absence of the pallet P based on whether or not the lock bar is pushed down by its own weight (see, for example, Japanese Patent No. 4222499). In the present invention, the configuration of the pallet detection sensor 21 is not particularly limited.

The control unit 22A includes an MPU (Micro Processing Unit).
As shown in FIG. 5, various signals sent from the key switch 14a, the accelerator lever 14b, the lift switch 14c, the safety guard 15, and the brake pedal 20 of the operation panel 14 are input to the control unit 22A. The Then, the control unit 22A controls the traveling motor, the electromagnetic brake, and the mast 3 based on the input signals.

More specifically, the control unit 22A controls the accelerator lever 14b, the lift switch 14c, and the like when the key switch 14a is turned on and the safety guard 15 is in a use state (a state shown by a solid line in FIG. 13). Alternatively, when the brake pedal 20 is operated, the traveling motor, the mast 3 or the electromagnetic brake is driven according to the amount of operation, and the picking lift 1A is driven / stopped, or the cab 4 is moved up and down.
On the other hand, when the key switch 14a is not turned on or when the safety guard 15 is in a non-use state (a state shown by a dotted line in FIG. 13), the control unit 22A Even if the switch 14c or the brake pedal 20 is operated, the picking lift 1A is not run / stopped or the cab 4 is not raised or lowered.

  The control unit 22A further controls the guard unit moving means (sliding roof 16 and power cylinder 19) and the display means 18 based on the detection result of the pallet detection sensor 21.

  More specifically, the control unit 22A determines whether or not the fork 13 is inserted into the pallet P based on a signal indicating the detection result of the pallet detection sensor 21 (see step S10 in FIG. 6).

  When the fork 13 is not inserted into the pallet P, the control unit 22A contracts the power cylinder 19 and slides the sliding roof 16 forward to bring the guard unit 17 into the close position (see FIG. 2 or FIG. 3B). (See S11 in FIG. 6), and the display screen of the display means 18 is the first screen shown in FIGS. 7A to 7E (see S13 in FIG. 6). The first screen indicates that the palette P does not exist and is in a dangerous state by a preset color, character, or the like, and the operator can easily recognize the risk of falling. Further, at least a part of the rear surface of the step space above step 10 (see the space between step 10 and head guard 12 shown in FIG. 13) is blocked by the guard portion 17 that has moved to the close position. Therefore, it is possible to prevent the operator from entering the space on the pallet.

  On the other hand, when the fork 13 is inserted into the pallet P, the control unit 22A extends the power cylinder 19 and slides the sliding roof 16 backward to move the guard unit 17 to the separated position (FIG. 1 or FIG. )) (See S12 in FIG. 6), and the display screen of the display means 18 is the second screen shown in FIGS. 7A to 7E (see S14 in FIG. 6). The second screen is a screen composed of colors, characters, etc. different from the first screen, indicating that the pallet P exists and is in a safe state, and the operator indicates that there is no risk of falling. Can be easily recognized. Further, at least a part of the rear surface of the upper pallet space above the pallet P (see the space formed by the lines Y1 to Y4 shown in FIG. 13) and / or the vicinity thereof by the guard portion 17 moved to the separated position. Since it is blocked, the operator can be prevented from falling to the rear of the pallet P.

  7A shows that the first screen and the second screen are configured with different colors, and FIG. 7B shows the first screen and the second screen configured with different characters. FIG. 8C shows the first screen and the second screen configured with combinations of different colors and characters, and FIG. 10D shows the first screen and the second screen with different pictures ( (E) includes a first screen and a second screen that are composed of different moving images (moving images 1 and 2).

According to the fall prevention device of the picking lift 1A, depending on whether the guard portion 17 is near or far away and the display screens are different screens (first screen and second screen), that is, By these synergistic effects, it is possible to surely make the operator who performs the picking work aware of the presence or absence of the pallet P and effectively prevent the operator from falling.
Further, according to the fall prevention device for the picking lift 1A, the guard portion 17 can be reliably and smoothly slid between the separation position and the proximity position by the power cylinder 19 having excellent controllability.

  The expansion / contraction length L19 of the expansion / contraction member (power cylinder) 19 can be arbitrary, but is preferably determined according to the length LP of the pallet P (or the length L13 of the fork 13). Is preferably determined as 0.5 × LP ≦ L19 ≦ LP (or 0.5 × L13 ≦ L19 ≦ L13). If L19> LP (or L19> L13), the presence of the guard portion 17 that has moved to the separated position increases the overall length of the picking lift 1A and makes the handling of the vehicle worse. Further, if L19 <0.5 × LP (or L19 <0.5 × L13), it will hinder the operator's picking work.

  Further, the head guard 12 and the sliding roof 16 (side end portions 16L, 16R) are parallel to the step 10, but do not need to be completely parallel, and are inclined in either the up or down direction. Also good.

(Second embodiment)
The picking lift 1B according to the second embodiment of the present invention further includes a lift height detection sensor 23 that detects the lift height of the cab 4 and a sound output unit that can output sound, and the control unit 22B detects the pallet. Based on the detection result of the sensor 21 and the height of the driver's cab 4 detected by the height detection sensor 23, the display screen of the display means 18 is set to a different screen, and different voices are output from the voice output unit according to the different display screen. Is different from the picking lift 1A according to the first embodiment.

In the picking lift 1B, the tip of the wire drawn from the pulley provided at the lower part of the outer mast constituting the mast 3 is connected to the top of the inner mast, and when the inner mast moves up and down with the cab 4 with respect to the outer mast, The pulley rotates, and the wire is drawn out or wound up.
The lift height detection sensor 23 detects the lift height of the cab 4 by detecting the amount of rotation of the pulley.

  The control unit 22B determines whether or not the fork 13 is inserted into the pallet P based on a signal indicating the detection result of the pallet detection sensor 21 (see step S10 in FIG. 10).

  When the fork 13 is not inserted into the pallet P, the control unit 22B moves the guard unit 17 to the close position as in the first embodiment (see S11 in FIG. 10). Then, the control unit 22B determines the lift H of the cab 4 detected by the lift detection sensor 23 (see S20 in FIG. 10), and displays based on a signal indicating the lift H as follows. The means 18 is controlled. That is, when the lift height H of the cab 4 is less than the first lift height H1 (for example, 1 m), the control unit 22B sets the display screen of the display means 18 to the fourth screen shown in FIGS. (Refer to S21 in FIG. 10) When the lift height H of the cab 4 is not less than the first lift height H1 and not more than the second lift height H2 (for example, 4.9 m) (provided that H2> H1), the display means 18 11A to 11E (see S22 in FIG. 10), and when the lift height H of the cab 4 exceeds the second lift height H2, the display screen of the display means 18 is displayed. Is the fifth screen shown in FIGS. 11A to 11E (see S23 in FIG. 10). Note that when the lift height H of the cab 4 exceeds the second lift height H2, it can be said that the situation is extremely dangerous for the operator, so the control unit 22B stops the traveling function of the picking lift 1B (accelerator lever 14b). Etc.).

  On the other hand, when the fork 13 is inserted in the pallet P, the control unit 22B moves the guard unit 17 to the separation position as in the first embodiment (see S12 in FIG. 10). And the control part 22B determines the raising height H of the cab 4 detected by the elevation detection sensor 23 (refer S30 of FIG. 10), and displays based on the signal which shows the raising height H as follows. The means 18 is controlled. That is, when the lift height H of the cab 4 is less than the first lift height H1, the control unit 22B sets the display screen of the display means 18 to the second screen shown in FIGS. 11A to 11E (FIG. 10). S31), when the lifting height H of the cab 4 is not less than the first lifting height H1 and not more than the second lifting height H2, the display screen of the display means 18 is the third screen shown in FIGS. 11 (A) to (E). (Refer to S32 in FIG. 10) When the lift height H of the cab 4 exceeds the second lift height H2, the display screen of the display means 18 is the fifth screen shown in FIGS. 10 (see S33).

  As in FIG. 7, FIG. 11A shows that the first screen and the second screen are configured in different colors, and FIG. 11B shows that the first screen and the second screen are different from each other. FIG. 4C shows that the first screen and the second screen are composed of a combination of different colors and characters. FIG. 4D shows the first screen and the second screen. The screen is composed of pictures different from each other, and FIG. 8E shows the first screen and the second screen composed of different moving pictures (moving pictures 1 to 5).

In addition, the control unit 22B performs a melody or a melody according to the display screen (first screen to fifth screen), that is, based on the detection result of the pallet detection sensor 21 and the height detected by the height detection sensor 23. Different voices 1 to 5 such as voices are output from the voice output unit.
Note that the control unit 22B may output sounds having different volumes and sound ranges, or may silence at least one of the sounds. Further, the audio output unit may be provided in the display unit 18 or may be provided in the cab 4.

By the way, the danger of the operator falling during the picking operation changes depending on the lift height of the cab 4. For example, when the pallet P does not exist and the lift height is high, the operator It is necessary to fully recognize the risk of falling, but when the lift is low, it is not necessary for the operator to excessively recognize the risk of falling.
According to the fall prevention device for the picking lift 1B, the display screen of the display means 18 differs based on the height of the cab 4 so that the operator can change the height of the cab 4 according to the display screen. The risk of falling can be determined accordingly.

  Further, according to the fall prevention device of the picking lift 1B, the voice of the voice output unit changes according to the display screen, so that the operator can recognize the danger of the fall by the visual and auditory synergistic effect, An operator can be prevented from falling more effectively.

(Modification)
The embodiments of the fall prevention device and the picking lift according to the present invention have been described above, but the present invention is not limited to these configurations.

(First modification)
The guard part moving means is not limited to the sliding roof 16 and the expansion / contraction member 19, and may be any means that can move the guard part 17 between the proximity position and the separation position.
In particular, the slide roof 16 is configured so that the guide rail portion 11G and the slide portion 16G are engaged and slide, but is not limited thereto. For example, although not shown in the drawings, instead of using the guide rail portion 11G and the slide portion 16G, a plurality of rotating rollers provided at intervals between the support members 11 (11L, 11R) and rotatable in the front-rear direction, The sliding roof 16 may be slid by the power cylinder 19 while abutting. According to this configuration, the frictional resistance between the sliding roof 16 and the rotating roller during sliding is smaller than the frictional resistance between the guide rail portion 11G and the sliding portion 16G. Smooth sliding is possible, and the power cylinder 19 can be reduced in size (lower power) and reduced in cost.
Moreover, in the said Example, although the slide type roof 16 is arrange | positioned above the head guard 12, it is not limited to this, You may arrange | position below the head guard 12. FIG.

(Second modification)
The guard part 17 is not limited to a member made of a metal material, and is preferably made of a member made of any material, particularly a member having both lightness and strength. Further, the guard portion 17 is not limited to the frame (fence), and can be arbitrarily restricted to the operator's rearward movement to some extent and easily visible to the operator (for example, a transparent window portion). Or a frame having an arbitrary shape such as a ladder shape).

(Third Modification)
On the display screen of the display means 18, in addition to presenting the safety status of the picking work, for example, the travel status of the picking lift 1 </ b> A (1 </ b> B) as shown in FIG. ○ km / h, is it in a safe situation, etc.), and the raising / lowering situation of the cab 4 as shown in Fig. (B) (for example, the current elevation of the cab 4 is □□ m, safe situation) Etc.), the load status of the load on the pallet P as shown in FIG. 10C (for example, whether the current load weight of the load is △ Δkg and is in a safe status), and the same figure At least one of the operating conditions (for example, whether the XX device is operating normally) of the picking lift mounted device as shown in (D) may be presented.
According to this configuration, other useful information other than safety information for preventing the operator from falling can be provided to the operator.

(Fourth modification)
The telescopic member 19 is composed of the power cylinder 19 in the above embodiment, but is not limited to this. For example, the telescopic member 19 is composed of an actuator capable of sliding the guard portion 17 between the separation position and the proximity position. Also good.

(5th modification)
The control unit 22A (22B) changes the display screen of the display means 18 by changing colors, characters, pictures, and moving images, but is not limited to this, and changes the figure, symbol, pattern, etc. By doing so, the display screen may be configured to be a different screen.

(Sixth Modification)
The lift height detection sensor 23 is not limited to that of the second embodiment, and may be composed of any sensor that can directly or indirectly detect the lift height of the cab 4.

1A, 1B, Picking lift 2 Vehicle body 3 Mast 4 Driver's cab 10 Step 10B Step rear end 11, 11L, 11R Support member 11G Guide rail 12 Head guard 12B Head guard rear end 13 Fork 14 Operation panel 14a Key Switch 14b Accelerator lever 14c Lift switch 15 Safety guard 16 Sliding roof 16B Sliding roof rear end portion 16G Sliding portion 16L, 16R Sliding roof side end portion 17 Guard portion 18 Display means 19 Telescopic member (power cylinder)
19a Storage case 19b Rod 20 Brake pedal 21 Pallet detection sensors 22A, 22B Control unit (MPU)
23 Lifting height detection sensor P Pallet

Claims (8)

In a picking lift comprising a step, a head guard that covers the overhead of an operator who has boarded the step, and a pair of forks extending rearward from a rear end of the step, A fall prevention device for preventing an operator from falling down,
A guard part;
Guard part moving means capable of moving the guard part to a close position close to the rear end of the head guard and a separated position away from the rear end; and
Display means fixed to the guard part and capable of displaying a display screen for presenting the safety status of the picking work to the operator;
A pallet detection sensor for detecting whether the fork is inserted in the pallet;
A control unit for controlling the guard unit moving unit and the display unit based on a detection result of the pallet detection sensor;
When the fork is not inserted into the pallet, the control unit sets the position of the guard unit as the proximity position, and when the fork is inserted into the pallet, The fall prevention device according to claim 1, wherein the display screens are different from each other when the fork is not inserted into the pallet and when the fork is inserted into the pallet.   The fall prevention device according to claim 1, wherein the control unit changes the display screen to a different screen by changing at least one of a color, a character, a figure, a symbol, a pattern, a picture, and a moving image.   The display screen further presents at least one of a traveling state of the picking lift, a lifting state of the driver's cab, a loading state of a load on the pallet, and an operating state of a device on which the picking lift is mounted. The fall prevention device according to claim 1 or 2. The guard part moving means is composed of a sliding roof provided to be slidable in the front-rear direction with respect to the head guard, and an extendable member that expands and contracts in the front-rear direction.
The guard part is attached to the rear end of the sliding roof;
One end and the other end of the elastic member are fixed to the head guard and the sliding roof, respectively.
The control unit moves the guard unit between the proximity position and the separation position by expanding and contracting the telescopic member and sliding the sliding roof based on a detection result of the pallet detection sensor. The fall prevention device according to any one of claims 1 to 3.   The fall-preventing device according to claim 4, wherein the elastic member is a power cylinder. Further comprising a lift detection sensor for detecting the lift of the cab,
The said control part makes the said display screen a different screen based on the detection result of the said pallet detection sensor, and the said height detected by the said height detection sensor, The any one of Claims 1-5 characterized by the above-mentioned. The fall prevention device according to crab. A voice output unit that can output voice is further provided.
The fall prevention device according to any one of claims 1 to 6, wherein the control unit causes the audio output unit to output the different audio in accordance with the display screen of the display unit.   A picking lift comprising the fall prevention device according to any one of claims 1 to 7.

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