JP2010023618A - Load receiving platform elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load receiving platform elevator capable of simplifying a configuration for preventing a load receiving platform in a stored state from falling. <P>SOLUTION: The load receiving platform elevator 1 is mounted on a vehicle C in which a flapper 10 that rises when a vehicle travels is provided on a loading platform 11. The load receiving platform elevator includes: a load receiving platform 2 for loading goods; and a lift cylinder 5 for lifting the load receiving platform 2 from the ground to an upper position on the loading platform 11 with the supply of an operation oil. The load receiving platform 2 is mounted with a hinge part 8 to change its posture so that it takes a horizontal posture during unloading operation of goods, and takes a rising posture at the upper position when the vehicle travels. The load receiving platform 2 includes an abutting part 15 which can abut on the rising flapper 10 when the load receiving platform 2 in the rising posture at the upper position when the vehicle travels is about to fall. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a load receiving table lifting device that is attached to a vehicle and used for loading and unloading loads.

For example, Patent Document 1 discloses a load receiving table lifting device that is attached to a cargo vehicle and used for loading and unloading loads. This load receiving device elevating device includes a base bracket fixed to the load receiving plate, a load receiving plate on which a load is placed, an arm that attaches the load receiving plate to the base bracket and can be rotated up and down, and a hydraulic cylinder that rotates the arm up and down. And a hydraulic unit. When hydraulic oil is supplied from the hydraulic unit, the hydraulic cylinder contracts, and the load receiving platform can be raised on the loading platform.
In addition, the cargo cradle can be rotated around the center of rotation of the base, and when the vehicle is traveling without loading and unloading, the cargo cradle is raised on the platform and the cradle is moved around the rotation center. It is set as the state which raised the said receiving stand by rotating. Thereby, the load receiving platform lifting device can be compactly stored on the load receiving platform.

In such a loading platform lifting device, when the loading platform is not required, the hydraulic cylinder is contracted by supplying hydraulic oil to the hydraulic cylinder, the loading platform is raised on the loading platform, and the loading platform is raised. As stored. However, if the load in the extension direction acts on the hydraulic cylinder due to its own weight on the loading platform, for example, if a slight amount of hydraulic oil leaks in the valve in the hydraulic unit, the hydraulic oil may escape from the hydraulic cylinder. As a result, there is a risk that the cargo receiving platform will be lowered without permission.
Therefore, a dedicated locking device is required in order to hold the standing cradle on the cradle (Patent Document 1 and Patent Document 2).
In the load receiving platform lifting device described in Patent Document 1, as a locking device, a stop is provided on the load receiving stand, and a bracket is provided on the arm. By engaging the stopper and the bracket while the load receiving stand is raised, the load receiving stand can be locked in the retracted state.
In addition, the load receiving platform lifting device described in Patent Document 2 includes a lock claw and a hydraulic cylinder that rotates the lock claw as a lock device. The claw is engaged with the load receiving table, and the load receiving table is locked in the retracted state.

Japanese Utility Model Publication No. 63-44272 (see FIG. 2) Japanese Utility Model Publication No. 61-16177 (see FIG. 3)

  In the device of Patent Document 1, members for a lock device are provided on both the cargo receiving side and the arm side. Moreover, in the apparatus of patent document 2, in addition to the lifting and lowering hydraulic cylinder that lifts and lowers the load receiving table, a hydraulic cylinder that rotates the lock claw is further required. As described above, in the conventional load receiving table lifting apparatus such as Patent Document 1 and Patent Document 2, the configuration for preventing the load receiving table in the retracted state from being lowered is complicated, and the apparatus becomes expensive.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a load receiving table lifting device capable of simplifying the configuration for preventing the load receiving table from being lowered in the retracted state. .

  The load receiving platform elevating device of the present invention is mounted on the load platform of the vehicle provided with an opening / closing door provided on the load platform to stand up when the vehicle travels, and loads and unloads the load between the ground and the load platform. In the loading platform lifting apparatus to be performed, a vertically moving lifting unit having a loading platform on which a load is placed, and the lifting unit is lifted by supplying a working fluid to move the loading platform from the ground to an upper position on the loading platform. An elevating drive mechanism having a fluid actuator to be raised, and the elevating part is capable of changing its attitude so that the elevating part is in a horizontal position during loading and unloading work and is in a standing position in the upper position when the vehicle is traveling When the mounted portion and the load receiving stand in the upright position at the upper position when the vehicle is running start to descend or try to descend, the load receiving stand comes into contact with the openable door And a contact portion that prevents the descent.

  According to the present invention, when the working fluid is supplied to the fluid actuator, the elevating unit is raised and the load receiving platform is raised to the upper position on the loading platform. Therefore, when the vehicle travels, the working fluid comes out of the fluid actuator. In such a case, even if the lifting platform is lowered by its own weight and the cargo cradle in the up position when the vehicle is running, If it is going to descend, the abutting part of the elevating part abuts on the open / close door standing on the loading platform and prevents the loading platform from descending, so that the lifting unit can be prevented from descending to the ground. In this way, since the opening / closing door already provided in the vehicle is used and the descent of the receiving platform in the retracted state can be regulated, the number of members for preventing the descending of the receiving platform in the retracted state is reduced. The configuration can be simplified.

Moreover, it is preferable that the said contact part is a grounding part which is provided in the back surface of the said receiving cradle, and contacts the ground when the said receiving cradle in a horizontal posture gets down on the ground.
According to the present invention, the grounding portion that is provided on the back surface of the load receiving platform and contacts the ground when loading and unloading the load is also used as the abutting portion that prevents the load receiving platform from being lowered during vehicle travel. The number of parts can be reduced.

  Moreover, it is preferable that the said contact part is comprised by the non-metallic buffer member attached to the said raising / lowering part. According to this structure, the impact by contact of the contact part with respect to an opening / closing door can be relieved.

Moreover, it is preferable that the load receiving platform lifting apparatus of the present invention further includes a non-metallic buffer member that is attached to the opening / closing door and contacts the contact portion.
According to this structure, the impact by contact of the contact part with respect to an opening / closing door can be relieved.

  According to the present invention, since the opening / closing door already provided in the vehicle is used and the descent of the load receiving table in the retracted state can be regulated, many members are not separately required for preventing the descent of the load receiving table. Yes, the configuration can be simplified.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1, FIG. 2, FIG. 3 and FIG. 4 are side views showing an embodiment of the load receiving platform lifting apparatus of the present invention. FIG. 5 is a rear view of the load receiving table lifting device in the state shown in FIG. The load receiving platform lifting / lowering device 1 is mounted on the loading platform 11 of the cargo vehicle C including the loading platform 11 and is used for loading and unloading loads between the ground and the loading platform 11. A rear side door (opening / closing door) 10 is provided at the rear end portion of the loading platform 11 so as to stand up when the vehicle is traveling. Further, in FIG. 5, a side door 20 is provided at a side end portion in the vehicle width direction on the loading platform 11 so as to stand in a standing state when the vehicle travels.

  Each of these doors 10 and 20 can be opened and closed by being pivoted in the vertical direction by a hinge provided at the edge of the loading platform 11, and standing up from the edge of the loading platform 11 in a closed state (see FIG. 4). 5), and in the open state, the bag 11 hangs downward from the edge of the loading platform 11 (see FIGS. 1 to 3). The loading platform 11 is provided with a securing portion (not shown) that secures the standing doors 10 and 20 in the standing posture. The lashing portion is operated by the user, and is switched between a lashing state in which the doors 10 and 20 are restrained in a standing posture (closed state) and a release state in which the sashing state is enabled. In FIG. 5, the rear door 10 is in an open state. The doors 10 and 20 are made of a steel plate or the like.

  The load receiving platform lifting / lowering device 1 includes a load receiving stand 2 on which a load is placed. The load receiving stand 2 has a disk-shaped load receiving stand main body 21 having a placement surface 2a on which a load is placed. The illustrated loading platform lifting / lowering device 1 is attached to the rear end portion of the upper surface 11a of the loading platform 11, and the loading platform 2 has a position above the rear end portion of the loading platform 11 and a ground contact position behind the vehicle. Go up and down. The vehicle front-rear direction matches the depth direction of the load receiving platform 2 in the state of FIGS. 1 to 3, and the vehicle width direction (the left-right direction of the vehicle C) matches the width direction of the load receiving platform 2.

  In addition to the load receiving platform 2, the load receiving platform lifting / lowering device 1 includes a base bracket (base portion) 3 attached to the upper surface 11 a of the load receiving platform 11, a support body 7 that supports the load receiving rack 2, a base bracket 3 and a support body. 7 is provided with an arm body 4 that is coupled to a lift cylinder 7, a lift cylinder 5 that expands and contracts, and a power unit 6 that drives the lift cylinder 5. The base bracket 3, the arm body 4, and the support body 7 are provided at the end of one side in the vehicle width direction at the rear part of the loading platform 11 (see FIG. 5). And the goods receiving stand 2 is provided in the position near the center of the vehicle width direction.

The base bracket 3 is detachably attached to the rear portion of the upper surface 11a of the loading platform 11 with bolts 12, for example. Since the base bracket 3 is attached to the loading platform 11 with the bolts 12, it is easy to attach the cargo receiving platform lifting / lowering device 1 to the freight vehicle C, and it is only necessary to provide a bolt hole on the freight vehicle C side, and no major modification is required. It is.
Further, when the load receiving platform lifting / lowering device 1 is not used, the base bracket 3 can be detached from the load holding platform 11 by removing the bolts 12. Thereby, the load receiving platform lifting / lowering device 1 can be detached from the vehicle C. If the loading platform lifting / lowering device 1 is permanently installed on the loading platform 11, the loadable weight of the cargo vehicle C is reduced by its own weight or the loadable space on the loading platform 11 is reduced. Therefore, this can be prevented. This is particularly effective when the cargo vehicle C is a light truck having a relatively small loadable weight and a relatively small loading space on the loading platform 11.

  The arm body 4 has a first arm 13 and a second arm 14 and constitutes a parallel link. The first arm 13 is a member extending in one direction from the base bracket 3, the base portion 13 a of the first arm 13 is rotatably attached to the upper portion of the base bracket 3, and the tip portion 13 b is the support 7. It is rotatably attached to the upper part of a (side support frame 7a described later). The second arm 14 is a member extending from the base bracket 3 along the first arm 13, the base portion 14 a of the second arm 14 is rotatably attached to the base bracket 3, and the tip portion 14 b is supported. The body 7 (side support frame 7a) is rotatably attached.

  The arm body 4 swings between a standing position (FIG. 1) extending upward from the base bracket 3 and a rear position (FIG. 3) extending rearward and obliquely downward toward the ground. be able to. By this arm body 4, the support body 7 and the load receiving platform 2 can be moved up and down between an upper position above the rear portion of the loading platform 11 (FIG. 1) and a ground contact position (FIG. 3) that contacts the ground behind the vehicle. . Moreover, as shown in FIGS. 1-3, since the arm body 4 comprises the parallel link, it can be raised / lowered with the load receiving stand 2 (load receiving stand main body 21) made into a horizontal attitude | position. According to the above configuration, the base bracket 3 fixed to the loading platform 11 serves as a fixed portion, and the lifting portion is configured by the load receiving platform 2, the support body 7, and the arm body 4, and this lifting portion is connected to the fixed portion. Can move up and down.

  In FIG. 5, the load receiving platform 2 includes the load receiving table main body 21 whose surface is a placement surface 2 a on which a load is placed, and a first support member 22 attached to the load receiving table main body 21. This column member 22 is a member that linearly extends in the width direction of the cargo cradle 2, is fixed to the back side of the cargo cradle body 21, and is further partly outward from the side of the cargo cradle body 21. Is a protruding member. A second support member 23 is provided on the back surface of the cargo receiving body 21. The support member 23 has substantially the same length as the dimension in the width direction of the load receiving body 21. In the illustrated form, the support members 22 and 23 are formed of hollow square pipes and function as beam members (strength members) in the width direction of the load receiving table main body 21.

  The support 7 has a side support frame 7a, and the first support member 22 is attached to the lower part of the side support frame 7a via a hinge part (attachment part) 8. The side support frame 7a has a vertically long box shape, and houses the arm body 4 and the lift cylinder 5 and opens to the front of the vehicle in order to make the arm body 4 and the lift cylinder 5 function.

  FIG. 6 is an explanatory view for explaining the hinge portion 8. The hinge portion 8 is attached to the support 7 so that the load receiving platform 2 can change its posture. The hinge portion 8 is rotatable to the first bracket portion 8a, the first bracket portion 8a fixed to the side support frame 7a, the second bracket portion 8b fixed to the column member 22, and the second bracket portion 8b. As a hinge shaft 8c. The center line of the hinge shaft 8 c is horizontal and the width direction of the load receiving platform 2. The hinge portion 8 allows the load receiving base body 21 fixed to the column member 22 to rotate about the horizontal axis a with respect to the side support frame 7a. As a result, when the vehicle travels without using the load receiving platform 2 for loading and unloading the load, the load receiving platform main body 21 is in an upright position on the loading platform 11 (see FIGS. 4 and 6A), and the loading and unloading of the load is performed. During operation, the load receiving body 21 can be in a horizontal posture (see FIGS. 1 and 6B).

  In FIG. 1, the first column member 22 is attached to an intermediate portion in the depth direction (vehicle longitudinal direction) of the load receiving base body 21 in a horizontal posture. In addition, when the load receiving body 21 is in the standing posture (see FIG. 4), it is an intermediate portion in the height direction. And since the said hinge part 8 is attached to this support | pillar member 22, the rotation center (horizontal axis a) of the load receiving stand 2 is located in the intermediate part of the depth direction of the load receiving stand main body 21 in side view. To do. With this configuration, a portion of the load receiving body 21 on the front side of the vehicle with respect to the horizontal axis a (a portion on the base end 2b side of the load receiving stand 2) is a posture in which the load receiving stand 2 stands (see FIG. 4). ) Is located below the horizontal axis a. In this way, in order to position a part of the cargo bed main body 21 below the horizontal axis a and above the upper surface 11a of the cargo bed 11, the first column member 22 is installed from the upper surface 11a of the cargo bed 11. The position is set high. Specifically, as shown in FIG. 4, the load receiving platform lifting / lowering device 1 is configured such that the column member 22 exists at a height position facing the upper part of the upright door 10.

  And in order to make it the use state (state of FIGS. 1-3) which loads and unloads a load, the load receiving stand 2 is rotated by the hinge part 8, the load receiving stand main body 21 is made into a horizontal posture, and the mounting surface 2a Set to face up. In FIG. 6, a contact portion 9 a and a contacted portion 9 b are provided between the first bracket portion 8 a and the second bracket 8 b of the hinge portion 8 in order to maintain the load receiving table main body 21 in a horizontal posture. In FIG. 6, when the contact portion 9a made of a bolt is provided in the second bracket portion 8b and the load receiving base body 21 is in a horizontal posture, the contact portion 9a (the head of the bolt) is one of the first bracket portions 8a. It abuts on the part (contacted part 9b). This restricts the load receiving table body 21 from rotating too much beyond the horizontal posture.

  Then, as shown in FIG. 4 and FIG. 6 (a), the load receiving platform 2 is placed at an upper position on the loading platform 11 and rotated horizontally by 90 ° at the hinge portion 8. As shown in FIG. It will be in the folded state folded with respect to the side part support frame 7a. In this state, the base end 2b of the load receiving platform 2 is in the lower position, the front end 2c is in the upper position, and the base end 2b and the front end 2a are arranged on the same vertical plane.

In FIG. 5, the load receiving platform lifting / lowering device 1 includes a first lock device 17 for maintaining the load receiving stand 2 in the folded state. The first locking device 17 restricts the load receiving platform 2 in the folded state from rotating in the direction of falling backward. The lock device 17 is operated by an operator, and is switched between a locked state in which the load receiving platform 2 is fixed in a folded state and an unlocked state in which the fixing is released.
Furthermore, the load receiving platform lifting / lowering device 1 has a second lock device 18 for maintaining the load receiving stand 2 in a horizontal posture. The second locking device 18 restricts the load receiving base body 21 in a horizontal posture from rotating in a direction in which it is in a standing posture. The lock device 18 is operated by an operator, and is switched between a locked state in which the load receiving platform 2 is fixed in a horizontal position and an unlocked state in which the fixation is released.

  1 to 3, the lift cylinder 5 is a hydraulic cylinder (fluid actuator) that expands and contracts to raise and lower the load receiving table 2, and is attached between the arm body 4 and the support body 7. One end 5a of the lift cylinder 5 is rotatably attached to the first arm 13, and the other end 5b of the lift cylinder 5 is rotatably attached to the lower part of the side support frame 7a.

  The power unit 6 is a hydraulic unit that expands and contracts the lift cylinder 5, and the power unit 6 and the lift cylinder 5 constitute an elevating drive mechanism that elevates and lowers the load receiving platform 2. When the power unit 6 switches the supply of hydraulic oil (working fluid) to the lift cylinder 5, the lift cylinder 5 can perform an expansion / contraction operation. The operation of the power unit 6 is controlled by a control device (not shown) provided in the power unit 6. When the operator operates the operation unit 7e (see FIG. 5) provided on the side support frame 7, the control device causes the power unit 6 to perform a predetermined operation.

  Although not shown, the power unit 6 has a tank for storing hydraulic oil, a pump for discharging hydraulic oil, a motor for driving the pump, and hydraulic oil applied to any one of the head side and the rod side of the lift cylinder 5. The hydraulic unit is integrally provided with a switching valve for switching and supplying the power unit 6. The power unit 6 is attached to the side support frame 7 a together with the lift cylinder 5.

  According to this lift drive mechanism, the power unit 6 supplies hydraulic oil to the rod side of the lift cylinder 5, whereby the lift cylinder 5 performs a shortening operation and includes the load receiving platform 2 (FIG. 3) on the ground. As shown in FIG. 1, the loading platform 2 can be raised to the upper position above the loading platform 11 through the state shown in FIG. 2. Then, when the power unit 6 supplies hydraulic oil to the head side of the lift cylinder 5, the lift cylinder 5 performs an extension operation, and the load receiving platform 2 descends from the upper position to the ground. By this elevating drive mechanism, an elevating operation for loading and unloading the load placed on the load receiving platform 2 between the ground and the load platform 11 is executed.

  And the load receiving stand 2 can be changed to a standing posture (refer FIG. 4) by rotating the load receiving stand 2 in the upper position around the said horizontal axis line a by the hinge part 8. FIG. In this state, the freight vehicle C can run. Further, when the cargo vehicle C is driven, the door 10 is raised and the rear part of the loading platform 11 is closed. In this state, when the load receiving platform 2 in the standing position at the upper position tries to descend in the ground direction, the contact portion 15 included in the load receiving platform 2 comes into contact with the upper part of the standing door 10. This hinders the descent of the receiving platform 2.

  The contact portion 15 of the present embodiment is a portion on the back side of the load receiving platform 2 and is a grounding portion 15a that comes into contact with the ground when the horizontal load receiving platform 2 is lowered to the ground (see FIG. 3). ). In particular, the grounding portion 15a is constituted by a non-metallic buffer member 16. As shown in FIG. 5, four shock-absorbing members 16 are attached to the back surface of the load receiving platform 2, and these shock-absorbing members 16 serve as grounding portions 15a that come into contact with the ground. The left and right shock-absorbing members 16 on the base end 2 b side of the load receiving platform 2 in the shock-absorbing member 16 also function as the abutment portion 15.

The buffer member 16 is a plate-like member, and is attached to the column members 22 and 23 of the load receiving platform 2 with bolts. The buffer member 16 is attached to each side in the width direction of each of the support members 22 and 23. Specific examples of the material of the buffer member 16 include rubber, resin, and wood. According to the hinge portion 8, since the support member 22 is rotatable around the horizontal axis a together with the load receiving base body 21, when the load receiving base 2 is in a horizontal position, the buffer member 16 is supported by the support member 22. It exists in the state which exists in the lower surface side (refer FIG. 1). On the other hand, when the load receiving platform 2 is in the standing posture, the buffer member 16 is in a state of being present on the vehicle rear side of the column member 22 (see FIG. 4).
Furthermore, in the state where the cargo receiving platform 2 is in the standing posture, the first column member 22 is provided at a position facing the upper front surface of the door 10, so that the first column member 22 is attached to the first column member 22. The left and right shock-absorbing members 16 are arranged so as to be in contact with the upper front surface of the door 10.

In the embodiment of FIG. 4, the buffer member 16 provided on the load receiving platform 2 in the standing posture and the raised door 10 are in contact with each other. That is, when the door 10 is closed with respect to the load receiving platform 2 in the retracted state, the front surface of the door 10 contacts the buffer member 16 of the load receiving table 2.
As another embodiment, although not shown, the buffer member 16 provided on the load receiving platform 2 in the standing posture and the raised door 10 are opposed to each other with a gap. May be. That is, when the vehicle is traveling, the buffer member 16 and the door 10 may be close to each other. In this case, when the load receiving platform 2 in an upright position on the load receiving platform 2 starts to descend, the buffer member 16 (contact portion 15) provided on the load receiving platform 2 is raised. It can come into contact with the sliding door 10.

According to the load receiving platform lifting / lowering device 1 having such a contact portion 15, when the load receiving platform 2 is not necessary for loading and unloading of the load, the load receiving platform 2 is placed on the load receiving platform 11 by the hinge portion 8. Since the standing position can be stored at the upper position, the space on the loading platform 11 can be prevented from being narrowed by the loading platform 2, and the cargo vehicle C can be driven in this stored state.
And according to the said raising / lowering drive mechanism, when hydraulic fluid is supplied to the lift cylinder 5, since it is the structure which raises the receiving platform 2 to the upper position on the loading platform 11, in a vehicle running state, in the power unit 6 When hydraulic oil leaks (drops) in a valve or the like and hydraulic oil comes out of the lift cylinder 5, the load receiving platform 2 at the upper position may be lowered by its own weight. However, according to the present invention, even in such a case, the door 10 is restrained in a standing state by the lashing portion (not shown), and is in a standing posture at the upper position when the vehicle is traveling. When a certain load receiving platform 2 tries to descend (or starts to descend), the cushioning member 16 provided on the load receiving platform 2 comes into contact with the upper front surface of the sliding door 10 standing from the loading platform 11 and receives the load receiving platform. Since the lowering of the platform 2 is prevented, the cargo receiving platform 2 can be prevented from descending to the ground (or more).

As described above, the door 10 already provided in the cargo vehicle C is used and the descent of the load receiving platform 2 in the retracted state can be regulated. This member is unnecessary, and the configuration can be simplified.
Further, the abutment portion 15 is provided on the load receiving platform 2 of the elevating portion that moves up and down, and since the load receiving platform 2 is firmly configured to load a load, the freight vehicle C travels. Even if the contact portion 15 comes into contact with the coffin door 20 due to vibration generated by this, it is possible to prevent the load receiving platform 2 from being deformed.
In addition, by bringing the contact portion 15 (plate-shaped buffer member 16) into surface contact with the door 20, even if the impact force due to contact is large, the contact surface pressure can be reduced. Deformation of the contact portion 15 (the cargo receiving platform 2) and the door 20 can be prevented.

  Further, in the present embodiment, the grounding portion 15 a provided on the back surface of the load receiving table 11 and contacting the ground when loading and unloading the load is also used as the contact portion 15 that prevents the load receiving table 2 from being lowered due to its own weight. Therefore, the number of parts can be reduced. Moreover, since the contact part 15 is comprised by the nonmetallic buffer member 16, the impact by the contact of the contact part 15 with respect to the door 10 can be relieved. In particular, when the shock-absorbing member 16 is made of rubber, resin, or wood, even if the shock-absorbing member 16 and the door 10 come into contact with each other due to vibration generated during the traveling of the cargo vehicle C, noise (metal sound) is generated due to the contact. Can be prevented.

Since the load receiving platform lifting / lowering apparatus 1 of the present invention can be detached from the load receiving platform 11, the load receiving platform lifting / lowering apparatus 1 is provided with a suspension member for hanging the load receiving platform lifting / lowering apparatus 1 with a crane or the like. In FIG. 5, the load receiving platform lifting / lowering device 1 is provided with a restricting portion 19 that prevents the load receiving platform 2 that is rotated by the hinge portion 8 from being turned upside down so as to fall further toward the front side of the vehicle. Yes. The suspension member can be attached to a part of the restricting portion 19.
More specifically, in FIG. 8, the restricting portion 19 includes a first contact member 19a provided on the side portion of the load receiving platform 2 and a second contact member provided on the support body 7 (side support frame 7a). And a contact member 19b. The first abutting member 19a abuts on the second abutting member 19b, thereby restricting the load receiving platform 2 in the standing posture from rotating so as to further fall to the vehicle front side. Therefore, the suspension member 19c can be attached to the upper part of the second contact member 19b. That is, a screw hole 19d is formed in the upper part of the second contact member 19b, and a suspension member 19c made of an eyebolt is screwed into the screw hole 19d.
According to this structure, the hook of a crane (not shown) can be engaged with the suspending member 19c, and the load receiving platform lifting / lowering device 1 can be suspended. And since the control part 19 (2nd contact member 19b) which controls rotation of the load receiving stand 2 is used also as a bracket which attaches the suspension member 19c, a number of parts is reduced and manufacturing cost is reduced. Can do.

  Furthermore, the load receiving platform lifting / lowering device 1 of the present invention can remove the load receiving platform 2 from the support 7 while leaving the base bracket 3, the arm body 4, the lifting drive mechanism, and the support portion 7 on the load platform 11. FIG. 9 is a schematic configuration diagram of the hinge portion 8 of FIG. 6A viewed from the right side. The second bracket portion 8b on the load receiving platform 2 side is rotatably attached to the first bracket portion 8a on the support body 7 side by a hinge shaft 8c. The hinge shaft 8c is prevented from coming off in the direction of the shaft center (the horizontal shaft center a) (the direction of the arrow L in FIG. 9) by a pin member 51 attached to the end of the hinge shaft 8c. By detaching 51 from the hinge shaft 8c, the hinge shaft 8c can be extracted from the hinge portion 8. By extracting the hinge shaft 8 c, the first bracket portion 8 a and the second bracket portion 8 b can be separated, and the load receiving platform 2 can be easily detached from the support body 7.

  10 is a view of the hinge portion 8 shown in FIG. 9 as viewed from the side (in the direction of arrow R in FIG. 9). 9 and 10, the first bracket portion 8a is provided with a regulating plate 8d at the end. The restriction plate 8d is formed with a hole 8f through which the hinge shaft 8c is inserted, and an engaging portion 51b with which the head portion 51a of the pin member 51 is engaged. The engaging part 51b of FIG. 10 is formed by a notch. A through hole 8e penetrating in the diametrical direction is formed at the end of the hinge shaft 8c, and the hinge shaft 8c is inserted into the first bracket portion 8a by inserting the pin body 51c of the pin member 51 into the through hole 8e. It is prevented from falling out. Then, with the pin member 51 attached to the through hole 8e of the hinge shaft 8c, the head portion 51a engages with the engaging portion 51b. According to this engagement, even if the load receiving platform 2 (second bracket portion 8b) rotates around the horizontal axis, the hinge shaft 8c can be freely rotated because it is restrained by the first bracket portion 8a. First, the head portion 51a of the pin member 51 always exists on the vehicle rear side.

  For this reason, the operator can grasp the ring part 51d attached to the head part 51a from the rear of the vehicle and extract the pin member 51 from the hinge shaft 8c. After this operation, the hinge shaft 8c is extracted from the hinge part 8. be able to. If the head portion 51a is configured not to engage with the engaging portion 51b, the hinge shaft 8c also rotates when the load receiving platform 2 (second bracket portion 8b) rotates, and the hinge shaft 8c becomes the pin member 51. , The ring portion 51d of the pin member 51 faces in a direction other than the rear of the vehicle, and it becomes difficult for the operator to pull out the pin member 51. Further, when the head portion 51a of the pin member 51 is lowered, the pin member 51 may fall due to its own weight, and the hinge shaft 8c may come out of the hinge portion 8 without permission. However, according to the configuration of the present invention, this can be prevented.

  Further, as shown in FIG. 11, the load receiving table lifting apparatus 1 of the present invention can move up and down between the ground and the loading platform 11 using a (small) tiller P as a load. The cultivator P includes a main body 55, a handle 56 extending from the main body 55 and gripped by a user, and a wheel 57 and a rotary 58 attached to the main body 55. The rotary 58 has a plurality of blades, and is a member that rotates to cultivate the field. In order to use such a power tiller P as a load, the load receiving platform lifting / lowering device 1 includes a rotary support 60 that supports the rotary 58. The rotary support 60 is detachably attached to the load receiving table main body 21 by bolts and nuts (not shown).

  FIG. 12 is a plan view of the cargo receiving platform 2. As shown in FIGS. 11 and 12A, the rotary support 60 includes left and right attachment shaft portions 60b and a central connection shaft portion 60a that connects the left and right attachment shaft portions 60b. It is a U-shaped member in a plan view and can be constituted by a pipe. The rotary 58 can be mounted on the connecting shaft portion 60a in a state in which the rotary support 60 is attached to the tip portion 2c side of the load receiving platform 2. Further, the rotary support 60 can be attached to the load receiving table main body 21 so that the position of the rotary support 60 can be changed in the longitudinal direction of the vehicle, and the longitudinal position of the connecting shaft portion 60a can be adjusted according to the size of the tiller P.

  On the other hand, as shown in FIG. 12 (b), the rotary support 60 functions as a load fall prevention member on the load receiving platform 2 by changing the rotary support 60 to the rear end 2 c side of the load receiving platform 2. be able to. That is, the rotary support 60 is fixed to the load receiving platform 2 with the bolt and nut so that the rotary support 60 is placed on the mounting surface 2 a and the connecting shaft portion 60 a is positioned at the base end 2 b of the load receiving platform 2. Thereby, since the rotary support 60 becomes a stepped portion that is raised from the placement surface 2a, it is possible to prevent the load on the placement surface 2a from falling (sliding down or rolling down).

  Moreover, in FIG. 3, the goods receiving stand 2 has the slope part 65 in the front-end | tip part 2c side. The slope portion 65 constitutes an inclined surface 65a formed between the mounting surface 2a, which is substantially horizontal, and the ground in order to facilitate loading and unloading of luggage between the mounting surface 2a and the ground. . FIG. 13 is an explanatory diagram of the slope portion 65. The slope portion 65 is attached to the load receiving body 21 so as to be rotatable around a horizontal axis by a slope hinge portion 66. FIG. 14 is a view of the slope portion 65 and the slope hinge portion 66 as viewed from the back side of the load receiving platform 2 and shows both the left and right side portions in the width direction. Hinge portions 66 are provided on both sides in the width direction on the front end portion 2 c side of the load receiving platform 2. Each hinge part 66 has the 1st member 66a and the 2nd member 66b, the 1st member 66a is being fixed to the load receiving base main body 21, and the 2nd member 66b is being fixed to the slope part 65. As shown in FIG. The first member 66a has a pin 67a protruding toward one side in the width direction (arrow J direction), and the second member 66b has a hole 67b into which the pin 67a is inserted. The axis of the pin 67a is the center of rotation of the slope portion 65.

  The slope portion 65 is attached to the load receiving body 21 by moving the slope 65 to the other side in the width direction (arrow K direction) with respect to the load receiving body 21 to insert the pin 67a into the hole 67b. Is done by. And the bolt 68 is attached to the edge part of the width direction one side (FIG. 15 left side) of the load receiving base main body 21. As shown in FIG. The bolt 68 is attached in the vicinity of the hinge portion 66 on one side in the width direction, and restricts the second member 66b from coming out. That is, when the pin 67a of the first member 66a tries to come out from the hole 67b of the second member 66b, the bolt 68 comes into contact with the second member 66b. In order to reduce the height of the load receiving platform 2 when the load receiving platform 2 is stored in the standing posture, the bolt 68 may be removed from the load receiving table main body 21 in order to remove the slope portion 65 from the load receiving table main body 21. The removal and attachment work of the slope portion 65 is easy.

  As shown in FIGS. 13 and 14, the head of the bolt 68 can abut on the back surface of the rotating slope portion 65. Therefore, the inclination angle of the slope portion 65 (inclined surface 65a) during the lifting operation of the load receiving table 2 can be changed by adjusting the amount of protrusion of the bolt 68 from the load receiving table main body 21. In FIG. 13, the slope portion 65 is located on the distal end side of the hinge portion 66 and has a first inclined portion 69 a having the inclined surface 65 a, and the proximal end portion side of the load receiving platform 2 relative to the hinge portion 66. And a second inclined portion 69b existing in the. In a state where the load receiving platform 2 is grounded and away from the ground, the first inclined portion 69a is rotated downward, the second inclined portion 69b is rotated upward, and the back surface of the first inclined portion 69a is provided. The head of the bolt 68 is in contact. In this state, the second inclined portion 69b is above the placement surface 2a and is away from the placement surface 2a. The end of the second inclined portion 69b can contact the load placed on the placement surface 2a, and the load can be prevented from rolling down (sliding down) from the placement surface 2a to the first inclined portion 69a. it can.

  FIG. 15 is an electrical wiring diagram between the load receiving table elevating device 1 and the vehicle body side battery B. The first arm 13 or the second arm 14 of the arm body 4 of the load receiving platform elevating device 1 is constituted by a hollow pipe member. In FIG. 15, the first arm 13 is a pipe member having a circular cross section. By using the first arm 13 as a pipe member, the power cable Y for connecting the battery B mounted on the vehicle body and the power unit 6 of the load receiving device lifting / lowering device 1 is passed from the base bracket 3 through the second arm 14. It can be led to the part support frame 7a. According to this configuration, even if the arm body 4 is rotated, it is possible to prevent the power cable Y from being sandwiched between the base bracket 3 and the side support frame 7a. It is possible to prevent the cable Y from being cut when the cable Y is sandwiched and from being unable to lift and lower the load receiving platform 2. Further, the power cable Y is preferably inserted into the first arm 13 while being housed in a flexible (resin) tube. In addition, a hole (not shown) for leading the cable Y extending from the battery B and passing under the floor plate 15 to the base bracket 2 and the second arm 14 is provided directly below the base bracket 3 in the floor plate 15. Is formed.

  Moreover, the load receiving platform lifting / lowering apparatus of the present invention is not limited to the illustrated form, but may be of another form within the scope of the present invention. In the above-described embodiment, the case where the contact portion 15 is attached to the load receiving platform 2 has been described. However, the contact portion 15 may be attached to the elevating portion, for example, the support body 7 or the arm body 4. It may be attached to. That is, the contact part 15 should just be provided in the part which moves up and down at the time of raising / lowering of the cargo receiving stand 2. As shown in FIG.

  Moreover, although the contact part 15 was demonstrated as the nonmetallic buffer member 16 which is a member different from the cargo receiving stand 2, the contact part 15 may be a part of the cargo receiving stand 2. That is, the first strut member 22 (a part) of the load receiving platform 2 may be the contact portion 15, and the strut member 22 may be brought into contact with the door 10. In this case, as shown in FIG. 7, it is preferable that a buffer member 30 is attached to a portion of the sliding door 10 that comes into contact with the column member 22 (contact portion 15). The buffer member 30 is made of non-metal, and can be made of rubber, resin, or wood, for example.

Moreover, in the said embodiment, although the load receiving platform raising / lowering apparatus 1 was installed in the rear left end of the loading platform 11, and demonstrated the case where the load receiving platform 2 descend | falls to the vehicle rear, the attachment position may be another part, For example, the load receiving platform lifting / lowering device 1 may be attached so that the load receiving platform 2 descends to the side of the vehicle. In this case, when the load receiving platform 2 in the standing posture starts to descend or tries to descend, the contact portion 15 comes into contact with the side door 20 in the standing state.
Further, although the cargo vehicle C is not shown in the figure on the loading platform 11, a cargo box may be mounted. In this case, the rear saddle 10 is present, but the side saddle 20 is present. Not done. And in the state which does not use the load receiving stand 2, the load receiving stand raising / lowering apparatus 1 will be in the state accommodated in the cargo box.

It is a side view which shows one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. It is a side view of a load receiving table raising / lowering apparatus, and has shown the state which has a load receiving stand in the middle position of the raising / lowering direction. It is a side view of a load receiving table raising / lowering apparatus, and has shown the state which has a load receiving stand in a grounding position. It is a side view of a load receiving table raising / lowering device, and shows a state where the load receiving stand stands at an upper position. It is a rear view of the load receiving table raising / lowering apparatus of FIG. It is explanatory drawing explaining a hinge part (attachment part). It is explanatory drawing of the sliding door for the load receiving stand raising / lowering apparatus of other embodiment. It is explanatory drawing of the control part which prevents that the load receiving stand made into the standing posture falls so that it may fall down to the vehicle front side. It is the schematic block diagram which looked at the hinge part of Fig.6 (a) from the right side. It is the figure which looked at the hinge part shown in FIG. 9 from the side. It is explanatory drawing in the case of raising / lowering a tiller as a load. It is a top view of a receiving stand. It is explanatory drawing of a slope part. It is the figure which looked at the slope part and the hinge part for slopes from the back surface side of the load receiving stand, and has shown the right and left both sides of the width direction. It is an electrical wiring diagram between a load receiving table raising / lowering apparatus and a vehicle body side battery.

Explanation of symbols

1 Loading platform lifting device 2 Loading platform (lifting unit)
5 Lift cylinder (fluid actuator)
8 Hinge part (mounting part)
10 Shishido (open / close door)
11 Loading platform 15 Contact portion 15a Grounding portion 16 Buffer member 30 Buffer member C Cargo vehicle (vehicle)

Claims (4)

In the load receiving platform lifting apparatus for mounting and unloading the load between the ground and the loading platform, which is attached to the loading platform of the vehicle provided with the opening and closing door on the loading platform to be in a standing state when the vehicle is running.
An elevating part that moves up and down with a load receiving table on which the load is placed;
An elevating drive mechanism having a fluid actuator that raises the elevating unit by being supplied with a working fluid and raises the load receiving platform from the ground to an upper position on the load platform,
The elevating part is
A mounting portion on which the load receiving base is mounted so that the posture can be changed so that the horizontal posture is set when loading and unloading work and the standing position is set at the upper position when the vehicle is traveling;
A contact portion that abuts on the open / close door to prevent the load receiving table from descending when the load receiving table in the standing position at the upper position starts to descend or tries to descend when the vehicle is running. A receiving platform lifting device characterized by that.   The said contact part is a contact point raising / lowering apparatus of Claim 1 which is provided in the back surface of the said load receiving stand, and is a grounding part which contacts the ground, when the said receiving stand in a horizontal posture gets down on the ground.   The said contact part is a load receiving stand raising / lowering apparatus of Claim 1 or 2 comprised by the non-metallic buffer member attached to the said raising / lowering part.   The load receiving table elevating device according to claim 1, further comprising a non-metallic buffer member attached to the opening / closing door and contacting the contact portion.

Images