JP2010111496A - Cargo handling device of cargo handling vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cargo handling device of a cargo handling vehicle capable of preventing a cylinder device from being damaged due to the interruption of the replacement of a fork at a position where the cylinder device cannot be pulled out of each cylinder. <P>SOLUTION: A mast device 3 of the load handling vehicle comprises a liftable carriage 9, detachable left and right forks 8, and the left and right cylinder devices 10 for adjusting the distance between the forks 8. Each cylinder device 10 comprises an extending and retracting rod 17, a connection part 22 to which the end 17a of the rod 17 is connected and which is provided at each fork 8, and stopper plates 49a, 49b for restricting the release of the connection of the rod 17 and the connection part 22 when the fork 8 is positioned between left and right masts 7. By this constitution, in a position where the connection of the stopper plates 22 and the rod 17 is not released, the release of the connection of the rod 17 and the connection part 22 is restricted by the stopper plates 49a, 49b, the replacement of each fork 8 is interrupted, and the cylinder device 10 is prevented from being damaged. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a cargo handling device installed in a cargo handling vehicle such as a forklift, and more particularly to a cargo handling device for a cargo handling vehicle provided with a cylinder device capable of adjusting a distance between detachable forks according to the size of a load. is there.

An example of a conventional cargo handling device is disclosed in Patent Document 1.
The cargo handling device disclosed in Patent Document 1 is a forklift in which left and right detachable forks are mounted on an upper member that forms a carriage that moves up and down along a mast provided at the front of a vehicle so as to be laterally movable. This is a cargo handling device. In the left and right forks, an upper hook portion provided at an upper end of an upright portion of each fork is hung on the upper member, and a rear lower portion of the upright portion is in contact with a front surface of a lower member forming a carriage in a lateral direction. It is supported movably. Further, between the upper member and the lower member, the base end is fixed to the left and right members forming the carriage with a predetermined interval in the vertical direction, and the tip of the rod to be retracted is vertically directed to the rear surface of the left and right forks. Two cylinder devices are provided which are connected at a predetermined interval and arranged substantially horizontally.

In the above configuration, when the rod of each cylinder device is retracted and retracted, the left and right forks are moved laterally along the upper member and the lower member, and the interval between the forks is adjusted.
A fork bracket having a hole into which the rod of the cylinder device is fitted is provided on the rear surface of each fork. In addition, a detachable stopper is provided which is fitted to the tip of the rod in a state where the rod of each cylinder device is fitted in the hole of each fork bracket and is fixed by a predetermined mounting means. The fork bracket of each fork and the rod of each cylinder device are connected by this stopper. Specifically, the rod is fitted with the head, the locking portion to which the stopper is attached with a diameter smaller than the maximum diameter of the head, and the hole of the fork bracket having a diameter larger than the maximum diameter of the head from the tip. Fork bracket that has a fitting part and a contact part that is larger than the maximum diameter of the fitting part and that comes into contact with the hole part of the fork bracket from the side, and is fitted to the fitting part and contacts the contact part The fork bracket and each rod are connected to each other by inserting a stopper into the locking portion of the rod so as to be sandwiched with the contact portion.

In the forklift cargo handling device constructed in this way, the stopper is removed from the locking portion of the rod, the cylinder device is driven to retract the rod, the cylinder device rod is extracted from the hole of the fork bracket of each fork, Thereafter, the carriage is lowered to the lowest position so that each fork stands upright on the ground. In this state, the forklift is moved backward to remove each fork from the carriage. In addition, after extracting the rod of each cylinder device from the fork bracket of each fork, each fork may be removed from the carriage by lifting the fork from the carriage by an external device.
Japanese Patent Laid-Open No. 2003-112897

  However, in the forklift handling device described above, when removing each fork, the stopper is removed from the locking portion of each rod, and after removing the rod from the fork bracket of each fork, each fork is moved upward relative to the carriage. Each fork is removed from the carriage, but when each fork is laterally moved near the center of the carriage, that is, the distance between the forks is narrow, and the cylinder device is driven to retract the rod. If the fork bracket is not completely removed from the fork bracket of each fork, moving the fork upward relative to the carriage will place an excessive load on the rod via the fork bracket, There was a risk of damaging the cylinder device.

  Also, if each fork is moved upward relative to the carriage without driving the cylinder device and without removing the rod from the fork bracket of each fork, an excessive load is applied to the rod via the fork bracket. There was a risk of damaging the cylinder device.

  Accordingly, an object of the present invention is to provide a cargo handling device for a cargo handling vehicle in which replacement of a fork is interrupted at a position where the cylinder device cannot be pulled out from each fork even when the cylinder device is driven, and damage to the cylinder device can be prevented. To do.

In order to achieve the above-described object, the invention according to claim 1 of the present invention includes a carriage provided to be movable up and down along a pair of left and right masts provided at the front of the vehicle, and a right and left along the carriage. A loading / unloading device for a loading / unloading vehicle, comprising: a pair of left and right forks guided by; and a left and right cylinder device that is provided with a base end on the carriage and adjusts a distance between the forks,
The cylinder device includes a cylinder portion and a rod that is withdrawn from and retracted from the cylinder portion, and a connecting portion to which a tip end portion of the rod is connected is provided on a rear surface of each fork, and A first restricting body that restricts the release of the connection between the rod and the connecting portion when positioned between the masts is provided.

  According to the above configuration, the connecting portion to which the tip of the rod is connected is provided on the rear surface of each fork, and when the fork is positioned between the left and right masts, the connection between the rod and the connecting portion is released. By providing the first restricting body to be regulated, even when each fork is removed from the carriage, the connection between the rod and the coupling part is released and the cylinder device is driven, so that the coupling part and the rod of each fork are driven. In a position where the connection between the rod and the connecting portion is not completely released (a position where each fork is stopped between the left and right masts), release of the connection between the rod and the connecting portion is restricted by the first restricting body. Exchange of each fork is interrupted without removing each fork. Therefore, by driving the cylinder device, the distance between the forks is adjusted to a position where each fork can be completely disconnected from the rod (the position where each fork is stopped outward from between the left and right masts). After that, replacement of each fork is resumed, and the cylinder device is prevented from being damaged without applying an excessive load to the cylinder device.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the connecting portion includes a connecting plate having a hole through which the rod passes, and the rod includes the hole. The first restricting body is configured to disengage the stopper of the connecting portion from the rod when the forks are positioned between the left and right masts. It is characterized by regulating so that there is no.

  According to the above configuration, when each fork is removed from the carriage by restricting the stopper of the connecting portion from being removed from the rod when each fork is positioned between the left and right masts, Even if the connection between the rod and the connecting portion is released and the cylinder device is driven, the connection between the connecting portion of each fork and the rod is not completely released (the position where each fork is stopped between the left and right masts). ), The first restricting body restricts the stopper from being removed from the rod, and the fork replacement is interrupted without removing the forks from the carriage. Therefore, by driving the cylinder device, the distance between the forks is adjusted to a position where each fork can be completely disconnected from the rod (the position where each fork is stopped outward from between the left and right masts). After that, replacement of each fork is resumed, and the cylinder device is prevented from being damaged without applying an excessive load to the cylinder device.

  The invention according to claim 3 of the present invention is the invention according to claim 1 or 2, wherein the fork can be guided to the left and right along the carriage on the rear surface of each fork. A hanging part, and a block for slidably sandwiching the carriage from above and below together with the hanging part, the block is detachably attached to the rear surface of the fork, and restricts the fork from being removed from the carriage when attached; The fork can be removed from the carriage at the time of removal, and a second restricting body is provided that restricts removal of the block when the forks are positioned between the left and right masts. Is.

  According to the above configuration, the vertical movement of each fork with respect to the carriage is restricted by providing the block for slidably holding the carriage from above and below together with the hanging portion, and the block is detachably attached to the rear surface of the fork. The fork is sometimes restricted from being removed from the carriage, and the fork can be removed from the carriage at the time of removal, and the removal of the block is restricted when the forks are located between the left and right masts. By providing the second restricting body, when each fork is removed from the carriage, the connection between the rod and the connecting portion is released and the cylinder device is driven. In the position where the connection is not completely released (the position where each fork is stopped between the left and right masts), the second Removal of the block is regulated by the regulating member, the exchange of each fork the not the forks are removed from the carriage is interrupted. Therefore, by driving the cylinder device, the distance between the forks is adjusted to a position where each fork can be completely disconnected from the rod (the position where each fork is stopped outward from between the left and right masts). After that, replacement of each fork is resumed, and the cylinder device is prevented from being damaged without applying an excessive load to the cylinder device.

According to a fourth aspect of the present invention, there is provided a carriage provided to be movable up and down along a pair of left and right masts provided at a front portion of the vehicle, and a pair of left and right forks guided to the left and right along the carriage. A left and right cylinder device for adjusting a distance between the forks, wherein the carriage is provided with a base end,
The cylinder device includes a cylinder part and a rod that is withdrawn from and retracted from the cylinder part, and a connecting part to which a tip part of the rod is connected to a rear surface of each fork, and the fork to the carriage. A hook part that can be guided to the left and right along the block, and a block that sandwiches the carriage slidably from above and below together with the hook part,
The block is detachably attached to a rear surface of the fork, and is configured to restrict the fork from being removed from the carriage when attached, and to be able to remove the fork from the carriage when removed. When located between the masts, there is provided a regulating body that regulates removal of the block.

  According to the above configuration, the vertical movement of each fork with respect to the carriage is restricted by providing the block for slidably holding the carriage from above and below together with the hanging portion, and the block is detachably attached to the rear surface of the fork. The fork is sometimes restricted from being removed from the carriage, and the fork can be removed from the carriage at the time of removal, and the removal of the block is restricted when the forks are located between the left and right masts. By providing a restricting body, the position where each fork is not completely disconnected even if the cylinder device is driven when each fork is removed from the carriage (the fork is located between the left and right masts). In the stopped position), the removal of the block is regulated by the regulating body, Replacement of each fork is interrupted the without the forks are removed from Yarijji. Therefore, by driving the cylinder device, the distance between the forks is adjusted to a position where each fork can be completely disconnected from the rod (the position where each fork is stopped outward from between the left and right masts). After that, replacement of each fork is resumed, and the cylinder device is prevented from being damaged without applying an excessive load to the cylinder device.

  According to the present invention, the connecting portion to which the tip of the rod is connected is provided on the rear surface of each fork, and when the fork is positioned between the left and right masts, the connection between the rod and the connecting portion is released. Even when the first restricting body to be controlled is provided and each fork is removed from the carriage, the connection between the rod and the connecting portion is released and the cylinder device is driven, the connection between the connecting portion of each fork and the rod Is not completely released (position where each fork is stopped between the left and right masts), the release of the connection between the rod and the connecting portion is restricted by the first restricting body, so that the carriage The replacement of each fork can be interrupted without removing each fork, so that the cylinder device can be driven to completely release the connection between the connecting part of each fork and the rod (each fork After adjusting the spacing between the fork position) that is stopped outward from between strike, the exchange of each fork is resumed, without excessive load is applied to the cylinder device can prevent damage of the cylinder device.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, reference numeral 1 denotes a forklift (an example of a cargo handling vehicle). The forklift 1 is operated in the front, rear, left and right directions by operating each operation device (not shown) disposed in the cockpit. A free vehicle 2 and a mast device (load handling device) 3 that is provided at the front of the vehicle 2 and transfers a load are provided. Here, the traveling direction of the vehicle 2 is defined as the front-rear direction X, and the horizontal direction orthogonal to the front-rear direction X is defined as the left-right direction Y.

  The mast device 3 includes a pair of left and right fixed masts 5 provided at the front of the vehicle 2, and a mast 7 including a pair of left and right movable masts 6 that can move up and down along the fixed mast 5. A carriage 9 provided so as to be movable up and down, a pair of left and right forks 8 that are detachably mounted on the carriage 9 and guided in the left-right direction Y along the carriage 9, and a base end of the carriage 9 are provided. A left and right cylinder device 10 that adjusts the distance between the forks 8 by sliding the pair of forks 8 in the left-right direction Y is provided.

  The carriage 9 has left and right lift brackets (guide plates) 13 that are moved up and down along rails (not shown) formed on the movable mast 6 at the rear part thereof. Also, left and right lift chains 14 are provided, one end of which is fixed to each fixed mast 5 and the other end of which is fixed to the lift bracket 13 via the upper part of the movable mast 6, and the movable mast 6 is fixed to the fixed mast by a lifting device (not shown). 5, the lift brackets 13 are lifted and lowered by the lift chains 14 and the carriage 9 is lifted and lowered.

  As shown in FIG. 2, each cylinder device 10 includes a cylinder portion 16 whose base end is fixed to the carriage 9 and a rod 17 that is withdrawn from and retracted from the cylinder portion 16. A tip portion 17 a is provided at the tip of the rod 17. As shown in the detailed view a of FIG. 3, the distal end portion 17a includes, in order from the distal end, a head 18 that is substantially the same diameter as the rod 17, a locking portion 19 that is smaller in diameter than the maximum diameter of the head 18, and a head 18 It is formed of a fitting portion 20 having a diameter larger than the maximum diameter and a contact portion 21 having a diameter larger than that of the fitting portion 20.

  Further, on the rear surface of each fork 8, a connecting portion 22 to which the tip portion 17a of the rod 17 is connected is provided. The connecting portion 22 passes through the head portion 18 and the locking portion 19 of the rod 17, the fitting portion 20 is fitted therein, and the fork bracket (an example of a connecting plate) having a hole portion 23 through which the abutting portion 21 cannot pass. ) 24 and the detachable stopper 36 that connects the fork bracket 24 and the rod 17 with the fitting part 20 of the tip 17a of the rod 17 fitting (penetrating) the hole 23 of the fork bracket 24. It is configured.

  An upper hooking portion 26 is formed on the upper rear surface of each fork 8 so that the forks 8 can be guided to the left and right along the carriage 9. A lower hanging portion (an example of a hanging portion) 28 is formed so as to be able to be guided on the lower portion.

  As shown in FIGS. 1 to 3, the carriage 9 is brought into contact with the slide shaft (upper member) 32 on which the upper hooking portion 26 of each fork 8 is hooked from above and the rear surface of each fork 8. In addition, a slide plate (lower member) 33 on which the lower hanging portion 28 of each fork 8 is hung from above and guided, and a side plate (left and right member) 34 connecting the slide shaft 32 and the left and right ends of the slide plate 33, To the frame. A block 30 is provided below the lower hook portion 28 of each fork 8 to sandwich the slide plate 33 of the carriage 9 together with the lower hook portion 28 so as to be slidable from above and below.

  The left and right lift brackets 13 of the carriage 9 connect the slide shaft 32 and the slide plate 33 up and down at the front position of the left and right movable masts 6, and projecting portions (not shown) protruding rearward are provided on the lift chain 13. Is connected to one end of the movable mast 6 so as to be movable up and down along the rail of the movable mast 6.

  Further, the base ends of the cylinder portions 16 of the left and right cylinder devices 10 are respectively fixed to the side plates 34 of the carriage 9 with predetermined intervals in the vertical direction, and the tip ends of the cylinder portions 16 are respectively fixed to the lift brackets 13. The cylinder device 10 is provided in the horizontal direction along the left-right direction Y, and is fixed to the front surface with a predetermined interval in the vertical direction. Here, the predetermined interval is an interval between the slide shaft 32 of the carriage 9 and the slide plate 33 so that at least the rods 17 moved out of the left and right cylinder devices 10 do not contact each other.

  The fork brackets 24 formed on each fork 8 are rear surfaces of the left and right forks 8, and the other fork bracket 24 is disposed above or below the one fork bracket 24 with the predetermined interval. The fitting portion 20 of the other or one rod 17 is fitted into the hole portion 23 of the one or other fork bracket 24 formed. In this fitted state, the stopper 36 is fitted into the locking portion 19 of the rod 17 and attached to the fork bracket 24 with a screw 37. Further, the stopper 36 is formed from a rectangular plate body, and a U-shaped notch is formed in the plate body with a width that fits the diameter of the locking portion 19 of the rod 17, and only from above the rod 17. It fits into the locking part 19 of the rod 17.

  With the above-described configuration, each rod 17 and each fork bracket 24 are integrally connected, the cylinder device 10 is driven, and each rod 17 is moved in and out, so that each fork 8 has a slide shaft 32 and a slide plate 33 of the carriage 9. And the space between the forks 8 is adjusted.

  Further, when each fork 8 is stopped at the position between the left and right masts 7 on the carriage 9, release of the connection between the rod 17 and the connecting portion 22 of each fork 8 is restricted. A stopper plate (an example of a first restricting body) 49 is provided that restricts the stopper 36 of the connecting portion 22 from being detached from the locking portion 19 of the rod 17 when stopped between 7. Specifically, a lower stopper plate 49a that connects the left and right lift brackets 13 directly above the lower cylinder device 10 (position close to the upper portion of the cylinder device 10) and restricts the stopper 36 from being pulled upward. And the upper part of the lift bracket 13 (or slide) on the other half of the rod 17 between the left and right lift brackets 13 just above the upper cylinder unit 10 (position close to the upper part of the cylinder unit 10). An upper stopper plate 49b that is suspended from the lower portion of the shaft 32 and restricts the attachment and detachment of the stopper 36 is provided.

  These upper and lower stopper plates 49 are plates that restrict the attachment and detachment of the stoppers 36 fitted in the locking portions 19 of the rods 17. When the forks 8 are located between the left and right lift brackets 13, It is located immediately above and restricts each stopper 36 from being removed upward.

  Further, a plurality of holes 49c are formed in the upper stopper plate 49b so that the upper stopper plate 49b does not block the view of the operator of the forklift 1 when the carriage 9 is raised and lowered. Yes.

  The block 30 is detachably attached to the rear surface of the fork 8 and is configured to restrict the fork 8 from being removed from the carriage 9 when the block 30 is attached and to be able to remove the fork 8 from the carriage 9 when the block 30 is removed. Yes. Specifically, a restricting portion 29 is provided to slidably hold the slide plate 33 together with the lower hook portion 28 so that the lower hook portion 28 of each fork 8 does not come off from the slide plate 33 of the carriage 9. The restricting portion 29 is provided with an interval between the vertical width of the slide plate 33 and the vertical width of the block 30 between the block 30 and the lower hanging portion 28, and a placement portion 39 on which the block 30 is placed. It consists of and.

  As shown in FIG. 4, the block 30 is formed with a hole 41 that passes through the block 30 along the left-right direction Y, and is inserted into the hole 41 to allow the block 30 to be attached to and detached from the mounting portion 39. Detachable means 42 is provided.

  The attaching / detaching means 42 is formed in an L-shape and a rod-shaped lever 43 formed with a spring stopper on the long side near the folding portion, and a hole portion into which the lever 43 is inserted into a rectangular plate, A pair of sandwiching plates 44 for sandwiching the mounting portion 39, a spring 45 into which the lever 43 is inserted, and a diameter larger than a hole formed in the sandwiching plate 44 fixed to the distal end portion of the long side of the lever 43 A nut 46 is provided, and a spring 45, one clamping plate 44, the block 30, the other clamping plate 44, and a nut 46 are inserted in this order on the long side of the lever 43. That is, each clamping plate 44 is inserted so as to sandwich the block 30 on the long side of the lever 43, and one clamping plate 44 is urged toward the block 30 by the spring 45.

  Further, a groove (not shown) is formed along the long side of the long side of the lever 43, and a protrusion (fitting to the groove of the long side of the lever 43 is formed in the hole of each clamping plate 44. (Not shown) is formed, and when the lever 43 is rotated about the long side of the lever 43 as a rotation center, each clamping plate 44 is similarly rotated. The protrusions formed on each clamping plate 44 are arranged so that when the long side of the lever 43 is inserted into the hole of each clamping plate 44, the short side of the lever 43 and the direction of each clamping plate 44 coincide. It is formed. That is, the short side of the lever 43 and each clamping plate 44 are configured to protrude in the same direction from the rotation center of the lever 43 in a side view.

  The block 30 placed on the placement unit 39 by the attaching / detaching means 42 is attached to the placement unit 39 by the clamping plate 44 biased inward by the spring 45 sandwiching the side surface of the placement unit 39. It is attached. When removing the block 30 attached to the mounting portion 39, by rotating the lever 43 backward, each clamping plate 44 is flipped up from the side surface of the mounting portion 39, and the block 30 is mounted. The block 30 can be removed from the placement portion 39 after being placed on the placement portion 39.

  The carriage 9 is provided with a lever plate (an example of a second restricting body) 48 that restricts the attachment / detachment (removal) of the block 30 when each fork 8 is stopped at the position between the left and right masts 7. Specifically, it is a plate that is suspended from the lower rear surface of the slide plate 33 between the left and right lift brackets 13 and restricts the attachment / detachment of the block 30. When each fork 8 is between the left and right lift brackets 13, it is attached / detached. When the lever 43 of the means 42 is rotated rearward, it comes into contact with the lever 43 and is restricted from being flipped up rearward from the side surface of the mounting portion 39.

Hereinafter, an operation for removing each fork 8 attached to the carriage 9 will be described.
First, the rod 17 of the cylinder device 10 is moved out, and the left and right forks 8 are moved outward, that is, the forks 8 are pulled out upward from the locking portion 19 without the stopper plate 49 directly above the stopper 36. At this position, the lever 43 slides to a position where the lever 43 does not exist behind the lever 43 and the lever 43 is rotatable. Further, the carriage 9 is lowered to a height at which the fork 8 comes into contact with the ground.

  Next, the screw 37 for fixing each stopper 36 to each fork bracket 24 is removed, the stopper 36 is pulled upward from the locking portion 19 of the rod 17, the rod 17 of the cylinder device 10 is moved backward, and the fork of the fork 8 is Pull out the rod 17 from the bracket 24. Then, the lever 43 of the block 30 attached to the placement portion 39 of each fork 8 is rotated rearward, and each clamping plate 44 is flipped up from the side surface of the placement portion 39 so that the block 30 is placed on the placement portion 39. The block 30 is removed from the mounting portion 39.

  Thereafter, the upper hanging portion 26 and the lower hanging portion 28 of each fork 8 are removed from the slide shaft 32 and the slide plate 33, respectively. At this time, the carriage 9 is lowered to bring each fork 8 upright on the ground, and the vehicle 2 is moved backward to remove the carriage 9 from each fork 8. An external device (not shown) for raising each fork 8 from the carriage 9 may be provided, and each fork 8 may be removed from the carriage 9 by this external device.

  As described above, when each fork 8 is removed from the carriage 9, if each fork 8 is located between the left and right lift brackets 13, it is fitted into the locking portion 19 of the rod 17 by the upper and lower stopper plates 49. The stopper 36 cannot be removed upward, and further, the lever plate 48 restricts each clamping plate 44 from jumping backward from the side surface of the mounting portion 39, and the block 30 cannot be removed. The removal of each fork 8 is interrupted, and each fork 8 can be completely disconnected from the connecting portion 22 of each fork 8 and the rod 17 (each fork 8 is stopped outward from the position between the left and right masts 7). ), The removal of each fork 8 is resumed.

  As described above, according to the embodiment of the present invention, the rod 17 can be locked in a state where the fitting portion 20 of the tip portion 17a of the rod 17 is fitted (penetrated) with the hole portion 23 of the fork bracket 24. Each fork bracket 24 and each rod 17 are connected by a stopper 36 that is detachable only from above, which is fitted into the portion 19. When each fork 8 is stopped between the left and right masts 7 on the carriage 9, By providing the upper and lower stopper plates 49a and 49b for restricting the attachment / detachment, the rod 17 cannot be pulled out from the lift bracket 24 of each fork 8 even when the cylinder device 10 is driven (each fork 8 has left and right lift brackets 13). At the position stopped between), the stopper 36 is restricted from being attached and detached, and the replacement of each fork 8 is interrupted. Therefore, the cylinder device 10 is driven and the connection between the connecting portion 22 of each fork 8 and the rod 17 can be completely released (position where each fork 8 is stopped outward from the position between the left and right masts 7). After the interval between the forks 8 is adjusted, the replacement of the forks 8 is resumed, and the cylinder device 10 can be prevented from being damaged without applying an excessive load to the cylinder device 10.

  Further, according to the embodiment of the present invention, the block 30 having the attaching / detaching means 42 attached to and detached from the mounting portion 39 and the left and right lift brackets 13 can be attached and detached by the lever 43 of the attaching / detaching means 42. By providing the restricting lever plate 48, each fork 8 is stopped at the position between the left and right lift brackets 13, and even if the cylinder device 10 is driven, the rod 17 is inserted into the hole 17 of the fork bracket 24 of each fork 8. In a position where the fork 8 cannot be removed, the lever 43 is brought into contact with the lever plate 48 even if the lever 43 of the attaching / detaching means 42 is rotated, and the replacement of each fork 8 is interrupted without removing the block 30 from the mounting portion 39. Therefore, the cylinder device 10 is driven and the connection between the connecting portion 22 of each fork 8 and the rod 17 can be completely released (position where each fork 8 is stopped outward from the position between the left and right masts 7). After the interval between the forks 8 is adjusted, the replacement of the forks 8 is resumed, and the cylinder device 10 can be prevented from being damaged without applying an excessive load to the cylinder device 10.

  Further, according to the embodiment of the present invention, the upper hanging portion 26 of each fork 8 is hung on the slide shaft 32, the lower hanging portion 28 is hung on the slide plate 33, and further, the block 30 is placed on the mounting portion 39, respectively. When the vehicle 2 is traveling, for example, even when different loads are applied to the forks 8 in the vertical direction relative to the carriage 9, the forks 8 are not moved up and down relatively with respect to the carriage 9. The cylinder device 10 can be prevented from being damaged without applying an excessive load to the cylinder 10.

  In the embodiment of the present invention, the stopper plate 49 restricts attachment / detachment of the stopper 36 at the position where the rod 17 cannot be removed from the lift bracket 24 of each fork 8 even when the cylinder device 10 is driven, and the block Although the attachment / detachment of 30 is restricted by the lever plate 48 and the exchange of each fork 8 is interrupted, at least one of the stopper plate 49 and the lever plate 48 (including the block 30) may be provided. . At this time, the attachment / detachment of the stopper 36 is restricted by the stopper plate 49 or the attachment / detachment of the block 30 is restricted by the lever plate 48, and the exchange of each fork 8 is interrupted. Therefore, the cylinder device 10 is driven and the connection between the connecting portion 22 of each fork 8 and the rod 17 can be completely released (position where each fork 8 is stopped outward from the position between the left and right masts 7). After the interval between the forks 8 is adjusted, the replacement of the forks 8 is resumed, and the cylinder device 10 can be prevented from being damaged without applying an excessive load to the cylinder device 10.

  Further, in the embodiment of the present invention, the upper stopper plate 49b is provided directly on the upper half of the lift bracket 13 on one half surface of the rod 17 between the left and right lift brackets 13 just above and above the upper cylinder device 10. However, the left and right lift brackets 13 may be connected directly above the upper cylinder device 10.

  In the embodiment of the present invention, the upper and lower stopper plates 49a and 49b are provided as the first restricting body, and the rod 17 cannot be pulled out from the lift bracket 24 of each fork 8 even if each cylinder device 10 is driven. At this position, the removal of the stopper 36 that connects the rod 17 of each cylinder device 10 and the connecting portion 22 of each fork 8 is restricted. However, even if each cylinder device 10 is driven, the lift bracket 24 of each fork 8 is driven. Further, the rod 17 and the connecting portion 22 may be covered with a cover at a position where the rod 17 cannot be removed from the cover, and removal of the stopper 36 may be regulated by this cover. Further, although the connecting portion 22 of the fork 8 and the rod 17 are connected by the stopper 36, they may be simply connected by bolts.

  In the embodiment of the present invention, the lever plate 48 is provided as the second restricting body, and the rod 17 is mounted at a position where the rod 17 cannot be removed from the lift bracket 24 of each fork 8 even if each cylinder device 10 is driven. The lever 43 of the attaching / detaching means 42 for attaching the block 30 to the mounting portion 39 is restricted from rotating backward, but the block 30 is attached to the mounting portion 39 from below with a bolt to drive each cylinder device 10 Even in such a case, it is possible to provide a plate for restricting the bolt from being pulled out from below at a position where the rod 17 cannot be pulled out from the lift bracket 24 of each fork 8.

1 is a side view of a mast device for a forklift according to an embodiment of the present invention. It is a front view of the mast apparatus of the forklift. It is a principal part expansion perspective view of the same mast apparatus. It is a principal part expansion perspective view of the fork of the forklift.

Explanation of symbols

1 Forklift
2 Vehicle
3 Mast equipment
7 Mast
8 Forks
9 Carriage
10 Cylinder device
17 Rod
17a Tip
22 Connecting part
24 Fork bracket
26 Upper hook
28 Lower hook
30 blocks
32 Slide axis
33 Slide plate
36 Stopper
42 Removable means
43 Lever
48 Lever plate
49a, 49b Stopper plate

Claims (4)

A carriage provided to be movable up and down along a pair of left and right masts provided at a front portion of the vehicle, a pair of left and right forks guided to the left and right along the carriage, and a base end provided on the carriage, the fork A loading / unloading device for a loading / unloading vehicle including left and right cylinder devices for adjusting an interval therebetween,
The cylinder device has a cylinder part and a rod that is withdrawn from the cylinder part,
Provided on the rear surface of each fork is a connecting portion to which the tip of the rod is connected;
A loading / unloading apparatus for a loading / unloading vehicle, comprising: a first restricting body that restricts release of the connection between the rod and the connecting portion when the forks are positioned between the left and right masts. The connecting portion is composed of a connecting plate having a hole through which the rod passes, and a stopper for connecting the connecting plate and the rod in a state in which the rod passes through the hole,
2. The cargo handling vehicle according to claim 1, wherein when the forks are positioned between the left and right masts, the first restricting body restricts the stopper of the connecting portion from being detached from the rod. Cargo handling equipment. On the rear surface of each fork,
A hook for hanging the fork so that it can be guided left and right along the carriage;
A block for slidably holding the carriage from above and below together with the hanging portion;
The block is configured to be detachable from the rear surface of the fork, restricting the fork from being removed from the carriage at the time of attachment, and configured to allow the fork to be removed from the carriage at the time of removal.
The cargo handling device for a cargo handling vehicle according to claim 1 or 2, further comprising a second regulating body that regulates removal of the block when each of the forks is positioned between the left and right masts. A carriage provided to be movable up and down along a pair of left and right masts provided at a front portion of the vehicle, a pair of left and right forks guided to the left and right along the carriage, and a base end provided on the carriage, the fork A loading / unloading device for a loading / unloading vehicle including left and right cylinder devices for adjusting an interval therebetween,
The cylinder device has a cylinder part and a rod that is withdrawn from the cylinder part,
On the rear surface of each fork,
A connecting portion to which the tip of the rod is connected;
A hook for hanging the fork so that it can be guided left and right along the carriage;
A block for slidably holding the carriage from above and below together with the hanging portion;
The block is configured to be detachable from the rear surface of the fork, restricting the fork from being removed from the carriage at the time of attachment, and configured to allow the fork to be removed from the carriage at the time of removal.
A cargo handling device for a cargo handling vehicle, comprising: a regulation body that regulates removal of the block when each of the forks is positioned between the left and right masts.

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