JP2008307932A - Cargo handling device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately position a loading platform at a desired retraction position when storing the loading platform under a floor. <P>SOLUTION: This cargo handling device C is provided with a slide cylinder 49 for taking in/out the loading platform 3 between a use position projected to a rear side of a vehicle and a retraction position on a lower side of a floor surface b2, a fixed frame 45 fixed to a vehicle body side to abut on a mechanism frame 9 when the loading platform 3 reaches the retraction position, and storage state detecting sensor 84 and detecting dock 85 for detecting the loading platform 3 at a position before the loading platform 3 reaches the retraction position. When the loading platform 3 is retracted up to the retraction position by the slide cylinder 49, driving of the slide cylinder 49 is stopped after the lapse of prescribed time T after detecting the loading platform 3 by the storage state detecting sensor 84 and the detecting dock 85. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a loading / unloading device that is provided in a vehicle and loads and lifts the cargo when loading / unloading the cargo onto / from the loading platform of the vehicle, and more particularly, the loading platform is stored below the floor when not in use. The present invention relates to a cargo handling device having an underfloor storage function.

In general, the loading device as described above supports the loading platform with two sets of parallel link arm tips, and holds the two sets of parallel link arms on the slide rail so that the loading platform is placed on the ground. When retracting from the grounded state below the floor, the two sets of parallel link arms are rotated upward to raise the loading platform to the retracted level below the floor, and then the two sets of parallel links. The arm is moved along the slide rail to the front of the vehicle body, and the loading platform is pulled down below the floor.
JP 2005-22593 A Japanese Patent Application Laid-Open No. 2005-233892

  By the way, in the configuration in which the loading platform is stored under the floor as described above, it is necessary to position the vehicle rear end portion of the stored loading platform at a predetermined position. In other words, if the vehicle rear end of the loading platform protrudes too far in the retracted state in the retracted state, the overall length of the vehicle is lengthened, and the departure angle (the line connecting the ground contact point of the rear wheel and the lower end of the rear of the vehicle) The angle formed with the ground (indicated by the symbol θ in FIG. 3) is reduced.

  However, in the cargo handling device according to Patent Documents 1 and 2, the positional accuracy of the retracting position of the loading platform when stored under the floor is hardly considered.

  In order to position the loading platform at a desired retracting position, the detecting means such as a proximity sensor detects that the loading platform retracted below the floor has been retracted to the retracting position, and stops the loading platform retracting. It is possible.

  However, in the case of such a configuration, the loading position of the loading platform varies due to the detection means and the attachment error of the detection target detected by the detection means.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle loading / unloading device that can accurately position a loading platform at a desired retracted position when stored under the floor.

  The present invention detects the loading platform at a position before the retracted position when retracting the loading platform, and continues the retracting operation for a predetermined time after the detection, thereby bringing the loading platform to the retracted position. It is made to reach reliably.

  The first aspect of the present invention is a vehicle handling apparatus that is provided on a vehicle and that moves up and down by placing the load when loading and unloading the load on the loading platform of the vehicle. According to a first aspect of the present invention, there is provided a loading platform for placing a load, a movable unit including a lifting drive means for moving the loading platform up and down between the ground and the floor of the loading platform, and the movable unit is moved. And a loading / unloading drive means for loading / unloading the loading platform between a use position protruding rearward from the loading platform and a retracting position below the floor surface, and fixed to the vehicle body side. A vehicle body side fixing member that comes into contact with the movable unit when the loading platform reaches the retracted position, and detection means for detecting the movable unit at a position before the loading platform reaches the retracted position. And retracting the loading platform to the retracted position by the loading / unloading driving means. Kiniwa shall stop the driving of the loading and unloading drive means after a predetermined time has elapsed from the detection of the movable unit by said detecting means.

  In the case of the above-described configuration, when the loading platform is retracted to the retracted position to be retracted, the loading platform is detected before the retracted position, and the retracting operation is continued for a predetermined time thereafter. That is, when the loading platform is detected by the detection means, the pull-in is not stopped immediately, but the pull-in is stopped after the pull-in is continued for a predetermined time after the detection.

  Here, the predetermined time is the time required for the movable unit to be retracted at a predetermined speed from the position where the movable unit is detected by the detection means to the position where the movable unit is in contact with the vehicle body side fixing member. Even if there is an attachment error or the like of the side fixing member or the movable unit, the time may be set to a time obtained by adding a margin time for the movable unit to reliably contact the vehicle body side fixing member. By setting the predetermined time in this way, the loading platform can be reliably retracted to the retracted position even if there is a mounting error in the detection means, the vehicle body side fixing member, the movable unit, etc. It is possible to prevent the pulling-in operation from stopping before reaching the position, that is, preventing the rear end of the loading platform from protruding beyond the vehicle in the underfloor storage state. In addition, since the above-mentioned margin time is included in the predetermined time, the loading platform will be pulled in for a time longer than the time required to actually reach the pull-in position, but the vehicle body side fixing member functions as a stopper. Thus, since the movement of the movable unit in the pull-in direction is restricted, it is possible to prevent the loading platform from being pulled further in the pull-in direction than the predetermined pull-in position.

  In this way, the loading platform can be reliably positioned at the predetermined retracted position in the underfloor storage state.

  In a second aspect based on the first aspect, the movable unit and the vehicle body side fixing member are in contact with each other via a buffer member.

  In the case of the above configuration, when the loading platform is retracted to the retracted position, the movable unit always comes into contact with the vehicle body side fixing member, but the movable unit and the vehicle body side fixing member come into contact with each other via the buffer member. , Can reduce the impact at the time of contact.

  In a third aspect based on the first aspect, the rear end of the vehicle functions as a bumper when the loading platform is stored in the retracted position.

  In the case of the above configuration, in addition to increasing the departure angle, it is possible to accurately position the vehicle rear end of the loading platform in the underfloor storage state as a bumper.

  According to a fourth invention, in any one of the first to third inventions, further comprising holding means for holding the loading platform below the floor surface, and after the loading platform is retracted to the retracted position. The loading platform is held in a retracted state by being raised by the lifting drive means and engaged with the holding means.

  In the case of the above-described configuration, the loading platform is retracted to the retracted position, and then lifted and held by the holding means to be stored under the floor. In such a configuration, if the retracting position of the loading platform varies, the loading platform cannot be successfully engaged with the holding means when it is raised and engaged with the holding means. On the other hand, in the fourth invention, since the loading platform can be accurately positioned at the retracted position, the loading platform and the holding means can be reliably engaged.

  According to the present invention, when the loading platform is retracted to the retracted position, the movable unit is detected at a position before the retracted position, and the movable unit is fixed on the vehicle body side by continuing the retracting for a predetermined time after the detection. The position where the member abuts, that is, the loading platform can be reliably positioned at the retracted position. As a result, variations in the vehicle departure angle can be suppressed.

  According to the second invention, when the loading platform is retracted to the retracted position, the impact at the time of contact can be reduced by bringing the movable unit and the vehicle body-side fixing member into contact with each other via the buffer member.

  According to the third aspect, the vehicle rear end of the loading platform in the underfloor storage state can be reliably positioned at a predetermined position for the vehicle rear end to function as a bumper.

  According to the fourth aspect of the present invention, in the configuration in which the loading platform is lifted from the retracted position and engaged with the holding means, the loading platform in the underfloor storage state is accurately positioned at the retracted position, thereby holding the loading platform and the holding platform. The means can be reliably engaged.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 3 show a van A as a vehicle. In the figure, reference numeral 1 denotes a vehicle body frame extending in the longitudinal direction of the vehicle body. The vehicle body frame 1 is mounted with a box-shaped cargo bed B provided with two doors b1 with double doors on the rear surface. Below the surface b2, a cargo handling device C according to an embodiment of the present invention is provided.

  The cargo handling device C includes a loading platform 3 of a two-fold type in which a front end platform 3a and a base end platform 3b are connected to each other by a hinge 4 so as to be foldable and unfoldable. And two sets of parallel link mechanisms 5 that cantilever support the base end of the platform 3 on both sides, and the loading platform 3 is put into a use state and a retracted state by the synchronous operation of the two sets of parallel link mechanisms 5. It is supposed to change. 1 is a use state in which the loading platform 3 in a folded state is pulled out from below the floor surface b2 and unfolded and the base end of the loading platform 3 is grounded to the ground G, and the one-dot chain line in FIG. The state in which the tip of the loading platform 3 is tilted forward and the entire loading platform 3 is grounded to the ground G, and the two-dot chain line in FIG. 2 indicates that the loading platform 3 is raised from the state of the solid line in FIG. 1, the two-dot chain line in FIG. 1 and FIG. 3 are the underfloor storage state in which the loading platform 3 is folded and pulled below the floor b2, and the solid line in FIG. 1 indicates the loading platform 3 in FIG. Each of the stowed and stowed states stood perpendicularly to the rear surface of the loading platform B (door b1) from the state of the chain line is shown. That is, the van A is a type having both the underfloor storage function and the standing storage function, and the storage posture during traveling can be appropriately selected.

  Two slide rails 7 on the vehicle body fixed side are horizontally disposed on the rear end sides of the both sides of the vehicle body frame 1 so as to extend in the longitudinal direction of the vehicle body. An extending mechanism frame 9 having a closed cross-sectional shape is supported via a slide member 11 so as to be movable in the longitudinal direction of the vehicle body. Two large and small first and second support brackets 13 and 15 are fixed to both ends of the mechanism frame 9.

  The parallel link mechanism 5 includes a tilt arm 19 whose upper end is pivotally attached to the first support bracket 13 having a large shape among the first and second support brackets 13 and 15 by a connecting shaft 17 so as to be rotatable in the vertical direction. I have. Near the upper end of the tilt arm 19, a lift arm 21 base end is pivotally mounted on a connecting shaft 23 so as to be pivotable in the vertical direction. The lift arm 21 tip is pivoted on the base end side platform 3 b with a connecting shaft 25 in the vertical direction. It is pivotally attached. A hydraulic lift cylinder 27 is disposed below the lift arm 21, and a cylinder tube 27 a base end of the lift cylinder 27 is pivotally attached to the lower end of the tilt arm 19 by a connecting shaft 29 so as to be vertically rotatable. At the same time, the tip of the piston rod 27b is pivotally attached to the lift arm 21 so as to be rotatable in the vertical direction by the connecting shaft 31. This lift cylinder 27 constitutes a lift drive means. A cylinder tube 33a base end of a hydraulic tilt cylinder 33 is pivotally attached to the second support bracket 15 so as to be pivotable in the vertical direction by a connecting shaft 35. The tip end of the piston rod 33b is the base of the base end platform 3b. It is pivotally attached to the end by a connecting shaft 37 so as to be rotatable in the vertical direction.

  As shown in FIG. 4, the mechanism frame 9 has a plurality of connecting frames 39 extending toward the rear of the vehicle body. The connecting frames 39 include a central bumper 41a and both left and right sides of the central bumper 41a. Are connected to the side bumpers 41b located at intervals. The bumper is thus divided into the central bumper 41a and the side bumper 41b in order to avoid interference with the parallel link mechanism 5 when the loading platform 3 is raised and lowered. At the center of the central bumper 41a in the vehicle width direction, a guide roller 43 is attached to be hanged when the loading platform 3 is stored below the floor surface b2.

  As shown in FIG. 4, a fixed frame 45 is bridged via a bracket 47 on the end side (vehicle body front side) of the two slide rails 7 in the retracting direction. The fixed frame 45 constitutes a vehicle body side fixing member. Between the slide rails 7, two hydraulic slide cylinders 49 extending in the front-rear direction of the vehicle body are integrally fixed to each other so as to overlap each other when viewed from the side of the vehicle body, One slide cylinder 49 is connected to the fixed frame 45 with the tip of the piston rod 49b facing the front of the vehicle body, and the other slide cylinder 49 has the piston rod 49b with the tip of the piston rod 49b facing the rear of the vehicle. The rod 49b is connected to the central bumper 41a side. That is, the two slide cylinders 49 constitute so-called opposed cylinders in which the respective piston rods 49b extend in opposite directions. By extending and retracting the slide cylinder 49, the folded loading platform 3 is put into and out of the floor b2 of the van A. This slide cylinder 49 constitutes a loading / unloading drive means. The loading platform 3, the slide member 11, the lift cylinder 27, the lift arm 21 and the mechanism frame 9 constitute a movable unit.

  Then, by operating the two sets of parallel link mechanisms 5 synchronously, in use, the loading platform 3 in the folded state is pulled out from below the floor surface b2 of the loading platform B by the extension operation of the slide cylinder 49, and the load is unloaded. With the lift cylinder 27 extended and retracted, the cargo is loaded and unloaded on the van A by moving up and down in a horizontal posture between the ground G and the height of the floor surface b2 of the loading platform B. (See FIG. 2). In addition, when the loading platform 3 is raised to the level of the floor surface b2 of the loading platform B in order to load and unload the load, a lifting stopper 21 with which the lift arm 21 comes into contact with the upper end of the first support bracket 13 so as not to be raised further. 51 is attached.

  The two tilt arms 19 of the two parallel link mechanisms 5 rotate around the connecting shaft 17 in a direction away from the mechanism frame 9 by the contraction operation of the lift cylinder 27 when the loading platform 3 is grounded in a horizontal posture. The tip of the loading platform 3 is tilted forward and downward so that the entire loading platform 3 is brought into contact with the ground G (see the one-dot chain line in FIG. 2). That is, when both the tilt arms 19 are rotated in the direction away from the mechanism frame 9, both the lift arms 21 are moved by the rotation so as to be pushed out to the front end side of the loading platform 3, and as a result, the loading platform 3 is moved. It rotates around the connecting shaft 37 and is grounded in a forward inclined posture. The loading platform 3 is rotated in the direction away from the mechanism frame 9 by its own weight or a total load obtained by adding the load of the load to the loading platform 3 and the tip of the loading platform 3 is tilted forward and lowered to the loading platform. 3 may be grounded to the ground G.

  On the other hand, at the time of storage, the loading platform 3 in the folded state is drawn under the floor of the loading platform B from the retracting level just before the interference with the slide rail 7 below the floor b2 by the contraction operation of the slide cylinder 49 (FIG. 3), or the loading platform 3 in an unfolded state is leaned against the door b1 of the loading platform B in a vertical posture from the floor surface b2 level by the extension operation of the tilt cylinder 33 (see the solid line in FIG. 1).

  When the former is stored under the floor, the rear ends of the distal end platform 3a and the proximal end platform 3b which are folded and overlapped vertically exhibit a bumper function while traveling. On the other hand, when the latter is stowed and stowed, the central bumper 41a and the side bumper 41b protrude rearward of the vehicle body from the loading platform 3 to the rear of the vehicle body, thereby exhibiting a bumper function during traveling.

  Further, at the time of storage under the floor, after the loading platform 3 is pulled down below the floor surface b2, it is pressed against the slide rail 7 by the extension operation of the lift cylinder 27 so as not to rattle during traveling. A pad 53 made of a cushioning material such as rubber against which the loading platform 3 is pressed is attached near the rear end of the vehicle body on the lower surface of the slide rail 7 (see FIG. 3).

  Further, the loading platform 3 is held in a state of being pressed against the slide rail 7 by the lock mechanism 6.

  Specifically, the lock mechanism 6 includes a hook 61 provided on the slide rail 7 side and a lock pin 71 provided on the loading platform 3 side. This lock mechanism 6 constitutes a holding means.

  As shown in FIGS. 4 to 8, a large bracket 55 is erected at the rear end of each of the slide rails 7, and two small brackets 57 project rearward of the vehicle body. Are arranged side by side. A support shaft 59 is inserted and fixed between the small brackets 57 so as not to rotate, and a pair of J-shaped hooks 61 each having a flange portion 61a at the front end face the engagement side of the flange portion 61a toward the rear of the vehicle body. Thus, the support shaft 59 is disposed so as to be pivotable in the vertical direction around the support shaft 59 with an interval in the width direction of the front end side platform 3a facing upward in a folded state. A mounting plate 63 is connected to the base ends of the hooks 61, and connecting portions 65 a at both ends of the operation bar 65 are connected to the mounting plates 63 of the pair of hooks 61. Further, a spring mounting piece 63a is integrally projected from the upper end of the mounting plate 63. On the other hand, one of the small brackets 57 is also provided with a spring mounting piece 57a on one of the small brackets 57, and the spring 67 is compressed between the spring mounting piece 57a and the spring mounting piece 63a of the mounting plate 63. In addition, a stopper 69 is attached to one of the small brackets 57 in the vicinity of one support shaft 59 (left side in FIG. 6). The pair of hooks 61 are urged counterclockwise in FIG. 6 by the spring 67 and the mounting plate 63 abuts against the stopper 69 so that the hook portion 61a is held in a vertical posture. Yes. Further, the pair of hooks 61 pushes down the operation bar 65 so that the spring 67 is positioned below the support shaft 59 (dead point) and maintains the posture of FIG. 9A. ing.

  On the other hand, a pair of lock pins 71 are supported by a bracket 73 so as to correspond to the pair of hooks 61 on the back surface of the front end platform 3a facing upward in the folded state of the loading platform 3, and the width of the loading platform 3 is increased. The hook portions 61a of the hooks 61 are engaged with the lock pins 71 from the front of the vehicle body.

  Then, when the loading platform 3 is stored under the floor, first, as shown by a one-dot chain line in FIG. 2, the loading platform 3 is unfolded and grounded to the ground G, and then is detached from the lock pin 71 and tilted forward of the vehicle body. The pair of hooks 61 (refer to FIG. 9A) holding the retracted posture are pushed up by manual operation of the operation bar 65 and counter-biased (counterclockwise) against the spring force of the spring 67. And the spring 67 is positioned above the support shaft 59 (dead point), and the spring force of the spring 67 urges and holds the flange 61a in a vertical posture facing downward, and stores the loading platform 3 under the floor. Prepare.

  Next, the loading platform 3 is folded and lifted up to the pull-in level just before it interferes with the slide rail 7 below the floor surface b2 by the extension operation of the lift cylinder 27, and then retracted below the floor surface b2 by the contraction operation of the slide cylinder 49. (See FIG. 9B). In this state, the lock pin 71 is approaching below the hook 61.

  Thereafter, the loading platform 3 is pressed against the pad 53 (see FIG. 3) on the lower surface of the slide rail 7 by further extending the lift cylinder 27. 9 (c) and 9 (d), the lock pin 71 presses the flange 61a of the hook 61 from below, and the hook 61 is resisted against the spring force of the spring 67. The lock pin 71 is rotated upward in the counter-biasing direction (clockwise) and the hook pin 61 is rotated in the biasing direction (counter-clockwise) by the spring force of the spring 67 by the passing operation. The flange 61a engages with the lock pin 71 from below to lock and hold the loading platform 3.

  On the other hand, when the loading platform 3 is used (drawout operation), the hook 61 is resisted against the spring force of the spring 67 by manually pressing the operation bar 65 while the loading platform 3 is locked. The hook 61 is rotated in the urging direction (clockwise) to release the hook 61a of the hook 61 from the lock pin 71 to release the lock holding state of the loading platform 3, and the spring 67 is moved to the support shaft 59 (dead point). The hook 61 is held in the disengagement posture by being positioned below.

  The cylinder tube 27a of the lift cylinder 27, the cylinder tube 49a of the slide cylinder 49, and the non-rod side working chamber of the cylinder tube 33a of the tilt cylinder 33 are connected to a hydraulic circuit 75 (see FIG. 10). The expansion and contraction operation of the cylinder 49 and the tilt cylinder 33 is performed by supplying and discharging hydraulic pressure to and from each anti-rod side working chamber.

  In the vicinity of the hinge 4 of the proximal platform 3b of the loading platform 3, as shown in an enlarged detail in FIG. 11, a folded state detection sensor 76 comprising a proximity sensor as a folded state detecting means is fixed. On the other hand, a detection dock 78 is fixed to a hinge shaft 77 on the base end side platform 3 b side of the hinge 4. The detection dock 78 approaches the folded state detection sensor 76 immediately before the loading platform 3 is folded 180 degrees from the unfolded state and the distal side platform 3a is turned over and overlaps the upper surface of the proximal side platform 3b. The folding state detection sensor 76 is turned on to detect the folding state of the loading platform 3. Contrary to the above, the folding state detection sensor 76 may be fixed to the hinge 4 (hinge shaft 77), while the detection dock 78 may be fixed to the proximal platform 3b. Furthermore, a limit switch may be employed instead of the proximity sensor.

  At the upper end of the slide member 11, as shown in an enlarged detail in FIG. 12, a drawer state detection sensor 79 composed of a proximity sensor as a drawer state detection means is fixed, while the end of the slide rail 7 in the drawer direction A detection dock 80 is fixed to the (rear end of the vehicle body) via a bracket 55. A stopper plate 82 is fixed to a bracket 81 below the detection dock 80, while a backing plate 82 is fixed to the slide member 11 below the pull-out state detection sensor 79. When the slide member 11 is moved to the rear end of the vehicle body by the extension operation of the slide cylinder 49 and the abutting plate 82 comes into contact with the stopper 83, the drawer state detection sensor 79 approaches the detection dock 80 and the drawer state is reached. The detection sensor 79 is turned ON to detect the state of pulling out from below the floor surface b2 of the loading platform 3. Contrary to the above, the drawer state detection sensor 79 may be fixed to the bracket 55 of the slide rail 7, while the detection dock 80 may be fixed to the slide member 11. Furthermore, a limit switch may be employed instead of the proximity sensor.

  As shown in an enlarged detail in FIG. 13, a storage state detection sensor 84 composed of a proximity sensor as a storage state detection unit is fixed to the mechanism frame 9, while a detection dock 85 is fixed to the fixed frame 45. Has been. When the mechanism frame 9 moves forward by the contraction operation of the slide cylinder 49 and approaches the fixed frame 45, the storage state detection sensor 84 approaches the detection dock 85 (see FIG. 13B). The storage state detection sensor 84 is turned ON to detect the storage state of the loading platform 3 below the floor surface b2. The storage state detection sensor 84 and the detection dock 85 constitute detection means. A pad 74 is provided on the surface of the fixed frame 45 facing the mechanism frame 9. The pad 74 constitutes a buffer member. The loading platform 3 stored below the floor surface b <b> 2 is configured to finally contact the pad 74. Contrary to the above, the storage state detection sensor 84 may be fixed to the fixed frame 45, while the detection dock 85 may be fixed to the mechanism frame 9. Furthermore, a limit switch may be employed instead of the proximity sensor.

  As shown in FIG. 10, the folded state detection sensor 76, the drawn state detection sensor 79, and the retracted state detection sensor 84 are all connected to a controller 90 as a control means. The controller 90 receives these detection signals (ON The lift cylinder 27, the slide cylinder 49, and the tilt cylinder 33 are expanded and contracted based on the signal).

  The controller 90 is connected to a changeover switch 86, an upper / close switch 87, and a lower / open switch 89. The upper / close switch 87 is a switch for raising the loading platform 3 in a substantially horizontal posture or turning it upward to bring it into a closed state. The lower / open switch 89 is a switch for lowering the loading platform 3 in a substantially horizontal posture or turning it downward to make it open. The changeover switch 86 is a switch for switching the above functions of the upper / close switch 87 and the lower / open switch 89.

  The changeover switch 86, the upper / close switch 87, and the lower / open switch 89 are provided, for example, in a switch case (not shown) attached to the rear portion of the vehicle body. Further, a raising solenoid 91, a lowering solenoid 93, a drawing solenoid 95, a drawing solenoid 97, a closing solenoid 98 and an opening solenoid 99 connected to the hydraulic circuit 75 are connected to the controller 90. The raising solenoid 91 and the lowering solenoid 93 are for moving the lift cylinder 27 up and down to move the loading platform 3 up and down. This is for pulling out the platform 3 from below the floor surface b2 or pulling it down below the floor surface b2. Further, the closing solenoid 98 and the opening solenoid 99 are for extending and retracting the tilt cylinder 33 to vertically close the loading platform 3 against the rear surface of the loading platform B (door b1), or to open the loading platform 3 in a substantially horizontal posture. is there.

  When the loading platform 3 is stored under the floor, the controller 90 excites the lifting solenoid 91 on the condition that the detection signal (ON signal) of the pull-out state detection sensor 79 is input, and the lift cylinder 91 The lifting solenoid 91 is output on the condition that the loading platform 3 is raised to the retracting level below the floor b2 and the detection signal (ON signal) of the folding state detection sensor 76 is input. Is demagnetized to stop the ascending command to the lift cylinder 27, and the pulling solenoid 97 is excited to output a pulling command to the slide cylinder 49. Further, the detection signal (ON signal) of the storage state detection sensor 84 is output. On the condition that the lifted solenoid 91 is energized and the lift cylinder 27 is lifted. It is configured to the output again pressing the loading platform 3 in the slide rail 7 the lower surface of the pad 53. On the other hand, when the loading platform 3 is pulled out, the loading platform 3 is placed below the floor b2 on condition that both detection signals (ON signals) of the folded state detection sensor 76 and the storage state detection sensor 84 are input. The lower solenoid 93 is excited so as to be lowered to the pulling level and a lowering command is output to the lift cylinder 27, the pulling solenoid 95 is excited to output a pulling command to the slide cylinder 49, and the pulling state is further increased. On the condition that the detection signal (ON signal) of the detection sensor 79 is inputted, the drawing solenoid 95 is demagnetized to stop the drawing command to the slide cylinder 49 and to output the lowering command to the lift cylinder 27 again. The loading platform 3 is configured to be grounded.

  Further, when the loading platform 3 is stowed and stowed, the controller 90 excites the tilting solenoid 98 on the condition that the detection signal (ON signal) of the pull-out state detection sensor 79 is input, and thereby the tilt A closing command is output to the cylinder 33, and the loading platform 3 is configured to stand vertically against the rear surface of the loading platform B (door b1). On the other hand, when the loading platform 3 is opened to a horizontal posture, the opening solenoid 99 is excited and the tilt cylinder is excited on condition that the detection signal (ON signal) of the pull-out state detection sensor 79 is input. An opening command is output to 33, and the loading platform 3 is configured to be in a horizontal posture at the same level as the loading platform B floor b2.

  Next, the operation of the cargo handling device C configured as described above will be described. The numbers given in parentheses below indicate the procedure of the operation process. First, underfloor storage will be described, and then standing storage will be described.

<Drawer operation from under floor storage>
(1) FIG. 14 shows the underfloor storage state of the loading platform 3. In the underfloor storage state, the lift cylinder 27 is in the extended state, the slide cylinder 49 is in the contracted state, and the tilt cylinder 33 is in the contracted state, and the back surface of the folded loading platform 3 on the front side of the platform 3a is the slide rail. 7 is pressed against the pad 53 on the lower surface. In this state, the selector switch 86, the upper / close switch 87, and the lower / open switch 89 are all OFF, the folding state detection sensor 76 and the storage state detection sensor 84 are both ON, and the drawer state detection sensor 79 is OFF. .

  (2) To pull out the loading platform 3 from this retracted state, first, the lock mechanism 6 is released by depressing the operation lever 65 to disengage the hook 61 and the lock pin 71, and then the lower -Push the open switch 89 by hand (by turning it ON) to excite the lower solenoid 93. Accordingly, the lift cylinder 27 is stopped after being slightly contracted, and the loading platform 3 is slightly lowered to a height (retraction level) that does not interfere with the pad 53 of the slide rail 7 and stopped as shown in FIG. Thus, the pressure on the slide rail 7 (pad 53) is released. Subsequently, the drawing solenoid 95 is excited, the slide cylinder 49 is extended, and the loading platform 3 is started to be pulled out. As a result, the storage state detection sensor 84 moves away from the detection dock 85 and the detection signal is turned off. Such an operation is performed on condition that both detection signals (ON signals) of the folding state detection sensor 76 and the storage state detection sensor 84 are input to the controller 90 when the lower / open switch 89 is ON. Based on program information preset in the controller 90. The operation described below is also the same.

  (3) If the lower / open switch 89 is kept pressed by hand, the loading platform 3 is pulled out as shown in FIG. 79 approaches the detection dock 80 (see FIG. 12), and both detection signals (ON signal) are input to the controller 90. Under this condition, the drawing solenoid 95 is demagnetized and the extension operation of the slide cylinder 49 is stopped. As a result, the withdrawal of the loading platform 3 is stopped, the lowering solenoid 93 is energized again, the lift cylinder 27 starts to contract, and the loading platform 3 starts to descend in the folded state.

  (4) When the loading platform 3 starts to descend, the proximal platform 3b continues to descend, but the distal platform 3a is supported by the guide roller 43, so as shown in FIG. The folding state detection sensor 76 moves away from the detection dock 78 and both detection signals are turned off.

  (5) When the proximal platform 3b of the loading platform 3 is grounded in a horizontal posture, the hand is released from the lower / open switch 89 (OFF operation is performed). Thereby, the lowering solenoid 93 is demagnetized and the contraction operation of the lift cylinder 27 is stopped. Thereafter, as shown in FIG. 18, the tip side platform 3a is held by hand and deployed.

  (6) The lower / open switch 89 is pushed by hand (ON operation), the lower solenoid 93 is excited to cause the lift cylinder 27 to contract again, and the loading platform 3 is tilted to ground (tilt) as shown in FIG. ) And load the luggage.

<Storage operation to under floor storage>
(1) First, the operating lever 65 is pulled up so that the hook 61 is in a vertical posture with the flange 61a facing downward. At the same time, the tip side platform 3a is lifted and folded by hand from the horizontal grounding state (FIG. 18) of (5) in the above <drawing operation from under floor storage state> and leaned on the guide roller 43 (see FIG. 20).

  (2) Push the up / close switch 87 by hand (turn it ON). At this stage, the detection signal (ON signal) of the pull-out state detection sensor 79 is input, and on this condition, the solenoid 91 is excited and the lift cylinder 27 starts to extend, and the loading platform 3 rises. Starting, as shown in FIG. 21, the loading platform 3 is raised to the retract level below the floor 2b. When the loading platform 3 rises to just before the pull-in level, the folded state detection sensor 76 is turned on by approaching the detection dock 78, and on the condition that this detection signal (ON signal) is input, 91 is demagnetized and the extension operation of the lift cylinder 27 is stopped, and the retracting solenoid 97 is excited, and the slide cylinder 49 starts to contract.

  (3) If the upper / close switch 87 is kept pressed by hand, as shown in FIG. 22, the loading platform 3 starts to be pulled down below the floor surface b2, and the pull-out state detection sensor 79 detects the detection dock 80. It will be off and will be in an OFF state.

  (4) If the pressing operation of the upper / close switch 87 is continued, the loading platform 3 is further pulled in, the storage state detection sensor 84 approaches the detection dock 85, and the detection signal (ON signal) is input to the controller 90. The Then, the timer 90a in the controller 90 starts to operate, and as shown in FIG. 24, when a predetermined time T has elapsed after the detection signal from the storage state detection sensor 84 is input, the controller 90 degausses the retracting solenoid 97. Then, the contraction operation of the slide cylinder 49 is stopped, and as shown in FIG. 22, the retracting operation of the loading platform 3 is stopped, and the lifting solenoid 91 is energized and the lift cylinder 27 is extended again. 23, the loading platform 3 is raised and pressed against the pad 53 on the lower surface of the slide rail 7. At this time, as described above, the lock pin 71 provided on the loading platform 3 engages with the hook 61 provided on the slide rail 7 so that the loading platform 3 is pressed against the pad 53 on the lower surface of the slide rail 7. It is held in the state.

  When the loading platform 3 is continuously retracted for the predetermined time T after the loading platform 3 is detected by the storage state detection sensor 84, the predetermined time T is stored in the storage state detection sensor 84, the detection dock 85, or the like. The time is set so that the mechanism frame 9 is surely brought into contact with the pad 74 of the fixed frame 45 even if the mounting accuracy of the mechanism frame 9 and the fixed frame 45 is poor. That is, the predetermined time T slides the distance from the position where the storage state detection sensor 84 of the mechanism frame 9 detects the detection dock 85 to the position where the mechanism frame 9 contacts the fixed frame 45 via the pad 74. Even if there is an installation error or the like of the storage state detection means 84, the detection dock 85, the mechanism frame 9, and the fixed frame 45 in the required design time required when the cylinder 49 is pulled in at a predetermined speed, the mechanism frame 9 It is set to a time obtained by adding a surplus time enough to reliably contact the fixed frame 45. Therefore, when the lift cylinder 27 is extended to raise the loading platform 3, the mechanism frame 9 is always in contact with the pad 74 of the fixed frame 45. In other words, the loading platform 3 is surely fixed to the predetermined position. It is pulled in to the retracted position. As a result, when the loading platform 3 rises again, the lock pin 71 provided on the loading platform 3 is surely positioned at a position corresponding to the hook 61 (a position below the flange portion 61a). The hook 61 can be reliably engaged. Further, in the underfloor storage state, the rear end of the loaded loading platform 3 functions as a bumper. However, the position of the rear end of the loaded loading platform 3 in a folded state functions as a bumper. It can be surely positioned at the position.

  Next, the standing storage will be described.

<Opening operation from the stowed storage state>
(1) FIG. 25 shows the stowed and stowed state of the loading platform 3. In this leaning storage state, the lift cylinder 27, the tilt cylinder 33, and the slide cylinder 49 are in an extended state. Further, the changeover switch 86, the upper / close switch 87, and the lower / open switch 89 are all OFF, the folding state detection sensor 76 and the storage state detection sensor 84 are both OFF, and the drawer state detection sensor 79 is ON. .

  (2) To unfold the loading platform 3 from this stowed and stowed state, the lower / open switch 89 is pushed by hand together with the changeover switch 86 (ON operation is performed). Then, the sensors 76, 79 and 84 are opened on condition that the above-mentioned ON / OFF state is opened, the solenoid 99 is excited, the tilt cylinder 33 starts to contract, and the loading platform 3 is set from the stowed and retracted state. It rotates in the opening direction.

  (3) When the loading platform 3 opens to the floor b2 level of the loading platform B as shown in FIG. 26, the hand is released from the changeover switch 86 and the lower / open switch 89 (OFF operation is performed). Then, only the lower / open switch 89 is pressed by hand (ON operation is performed). Then, the lowering solenoid 93 is excited, the lift cylinder 27 starts to contract, and the loading platform 3 starts to descend.

  (4) Thereafter, in the same manner as in the <drawing operation from the underfloor retracted state>, the load platform 3 is grounded and the load platform 3 is further pressed by continuing to press the lower / open switch 89, and further pressing the lower / open switch 89. The stacking platform 3 is tilted to ground (see FIGS. 18 and 19). In the opening operation from the stowed stowed state, the loading platform 3 is not folded, so that it is not necessary to manually unfold the front end side platform 3a.

<Close operation to the stowed stowed state>
(1) From the horizontal grounding state (see FIG. 18) or the tilting grounding state (see FIG. 19) of the loading platform 3, only the upper / close switch 87 is pushed by hand (ON operation is performed). At this stage, the detection signal (ON signal) of the pull-out state detection sensor 79 is inputted, and on this condition, the solenoid 91 is excited and the lift cylinder 27 starts to extend, and the loading platform 3 rises. Start. As shown in FIG. 27, when the loading platform 3 rises to the floor surface b2 level of the loading platform B, the lift arm 21 comes into contact with the raising stopper 51 and is prevented from further raising. At this time, a safety valve provided in the hydraulic circuit 75 operates. Here, the hand is once released from the upper / close switch 87 (OFF operation).

  The operation of pressing the up / down switch 87 is the same as the storage operation in the underfloor storage state (see (2) in <Storage operation in the underfloor storage state>), but the loading platform 3 is raised. However, since the detection signal (ON signal) of the folding state detection sensor 76 is not input, the loading platform 3 stops rising at the above-described pull-in level and does not pull below the floor surface b2, but reaches the floor surface b2 level. Continue to rise.

  (2) Next, the upper / close switch 87 is pushed together with the changeover switch 86 (ON operation is performed). At this stage, the detection signal (ON signal) of the pull-out state detection sensor 79 is continuously input. On this condition, the solenoid 98 is excited and the tilt cylinder 33 starts to extend, and the loading platform 3 is loaded. It starts to pivot so as to stand against the door b1 of B.

  (3) Eventually, when the loading platform 3 turns to a standing and stowed state facing the door b1 of the loading platform B substantially vertically as shown in FIG. Release your hand (turn OFF).

  As described above, in this embodiment, the controller 90 receives input signals from the changeover switch 86, the upper / close switch 87, and the lower / open switch 89, and receives the folded state detection sensor 76, the drawer state detection sensor 79, and the retracted state. Based on each detection signal of the detection sensor 84, by outputting a command to the lift cylinder 27, the slide cylinder 49, and the tilt cylinder 33, the loading platform 3 is moved up and down at the use position at the rear of the vehicle, and is stored in the floor. And stored in any storage state of the standing storage state. When the controller 90 stores the loading platform 3 in the underfloor retracted state, the controller 90 moves to a detection position in front of the retracted position where the loading platform 3 contacts the mechanism frame 9 and the fixed frame 45 via the pad 74. Upon arrival, the arrival of the loading platform 3 to the detection position is detected by the storage state detection sensor 84 and the detection dock 85. After the detection, the loading platform 3 is continuously retracted for a predetermined time T, and then By stopping the operation, the loading platform 3 can be reliably retracted to a predetermined retracting position. At this time, the predetermined time T is set to be longer than the time required for the loading platform 3 to pull in the actual distance from the detection position to the pull-in position. Since the fixed frame 45 is configured to abut against the pad 74 via the pad 74, the loading platform 3 is not further pulled in the pulling direction beyond the pulling position. Therefore, the loading platform 3 can be accurately positioned at the retracted position.

  At this time, in the retracted position, the mechanism frame 9 comes into contact with the pad 74 provided on the fixed frame 45, so that the impact at the time of contact can be reduced. In this embodiment, the pad 74 is provided on the fixed frame 45. However, the pad 74 may be provided, for example, on the mechanism frame 9. In addition, the pad 74 may be configured to be able to cushion an impact when the mechanism frame 9 and the fixed frame 45 abut. Any configuration can be employed as long as it is present.

  Therefore, according to the present embodiment, it is possible to prevent the rear end of the loading platform 3 from protruding beyond the vehicle rearward and thus reducing the departure angle θ (see FIG. 3). When going up and down, it is possible to avoid contact of the rear end of the cargo handling device with the ground.

  Further, in the present embodiment, the rear end of the distal end platform 3a and the proximal end platform 3b that are folded and overlapped vertically when stored under the floor exhibit a bumper function while traveling. By positioning 3 at the retracted position with high accuracy, the positions of the rear ends of the distal end platform 3a and the proximal end platform 3b can also be positioned with high accuracy. That is, if the retracting position of the loading platform 3 during storage under the floor varies, there is a possibility that the rear ends of the distal end platform 3a and the proximal end platform 3b cannot be positioned at desired positions for functioning as bumpers. On the other hand, according to this embodiment, since the retracting position of the loading platform 3 when stored under the floor is accurately positioned, the rear ends of the distal end platform 3a and the proximal end platform 3b are reliably functioned as bumpers. be able to.

  Furthermore, in the present embodiment, when storing under the floor, the loading platform 3 pulled up to the retracted position below the floor surface b2 is raised and the lock pin 71 provided on the loading platform 3 is provided on the slide rail 7. The loading platform 3 is configured to be held in the underfloor retracted state by the lock mechanism 6 by being engaged with the hook 61. However, by placing the loading platform 3 in the retracted position with high accuracy, the loading platform 3 is retained. 3 is lifted from it, the lock pin 71 can be accurately positioned at a position where the lock pin 71 is reliably engaged with the hook 61, and the lock pin 71 and the hook 61 can be reliably engaged.

  As described above, in this embodiment, the loading platform 3 is pressed against the pad 53 on the lower surface of the slide rail 7 in the retracted state by the extension operation of the existing hydraulic lift cylinder 27. It is possible to provide a cargo handling apparatus C that does not require a dedicated member for prevention, can be stably stored without being loose, and can be stably stored.

  Further, in the present embodiment, in the retracted state of the loading platform 3, there is no dedicated member between the slide rail 7 and the loading platform 3, so that the loading platform 3 is positioned at an upper position by that amount. The aperture angle θ can be increased, and contact of the rear end of the cargo handling device C with the ground G can be avoided when ascending and descending the slope.

  Furthermore, in the present embodiment, the loading platform 3 that is raised and stored below the floor b2 is locked and held by the pair of hooks 61 engaging with the lock pins 71. Even if oil leaks occur in the system and the hydraulic pressure is reduced, the loading platform 3 can be prevented from falling, and the loading platform 3 can be stably provided at two places spaced in the width direction. Can be held.

  Further, in this embodiment, since the hook 61 is unlocked by manual operation of the operation bar 65, a dedicated hydraulic cylinder for unlocking is not required, and a corresponding increase in production cost can be avoided.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  The present invention is useful as a vehicle loading / unloading device for retracting and storing a loading platform at a predetermined retracted position.

It is a rear perspective view of a van equipped with a cargo handling device of an embodiment, the state where the loading platform is stood against the door of the loading platform and stored in a vertical posture is a solid line, the state stored below the floor surface is a two-dot chain line, The grounded use state is indicated by a one-dot chain line. In the embodiment, a side view showing a state in which the loading platform is grounded in a substantially horizontal posture is indicated by a solid line, a state in which the whole is grounded in an inclined posture is indicated by a one-dot chain line, and a state where the loading platform is raised to the floor height of the loading platform is indicated by a two-dot chain line. It is. It is a side view which shows the underfloor storage state of the loading platform in embodiment. It is a top view which shows the loading platform of an underfloor storage state in embodiment. It is a perspective view which expands and shows the loading platform of an underfloor storage state in embodiment. It is a side view which shows the engagement state to the lock pin of a hook. FIG. 7 is a plan view of FIG. 6. FIG. 7 is a right side view of FIG. 6. Fig. 4 shows a lock holding process of the loading platform in the embodiment, (a) is a process diagram showing a retracted state of the hook, (b) is a process diagram showing a state in which the lock pin approaches a hook in a vertical posture, and (c) is a process diagram. Step (b) is a process diagram showing a state in which the hook is pressed by the lock pin and starts rotating. (D) is a process of (c) where the hook is engaged with the lock pin to hold the loading platform in a locked state. It is process drawing which shows the state performed. It is a control block diagram of a material handling apparatus. It is a principal part expanded side view which shows the positional relationship of a folding body detection sensor and a detection dock. It is a principal part expanded side view which shows the positional relationship of a drawer state detection sensor and a detection dock. It is a principal part enlarged plan view which shows the positional relationship of a storage state detection sensor and a detection dock, (a) is the state where a sensor is located in the position away from the detection dock, (b) is the sensor detected the detection dock. (C) shows a state where the mechanism frame is in contact with the pad of the fixed frame. Operation indicating the loading platform under floor storage state and the ON / OFF state of the changeover switch, up / down switch, down / open switch, folding state detection sensor, drawer state detection sensor and storage state detection sensor at this time, respectively It is process drawing. The loading platform is lowered to the retracted level below the floor surface in the retracted state, and the changeover switch, upper / close switch, lower / open switch, folding state detection sensor, drawer state detection sensor, and storage state at this time It is an operation process figure which shows the ON / OFF state of a detection sensor, respectively. The state in which the loading platform is pulled out from the storage state under the floor, and the changeover switch, the upper / close switch, the lower / open switch, the folding state detection sensor, the drawer state detection sensor, and the storage state detection sensor ON / OFF state at this time FIG. The state immediately before the loading platform is grounded, and the ON / OFF state of the changeover switch, the upper / close switch, the lower / open switch, the folding state detection sensor, the drawer state detection sensor, and the retracted state detection sensor are shown respectively. It is an operation process figure. Operations that indicate the horizontal grounding state of the loading platform and the ON / OFF states of the changeover switch, upper / close switch, lower / open switch, folding state detection sensor, drawer state detection sensor, and storage state detection sensor at this time, respectively. It is process drawing. Operation indicating the tilting grounding state of the loading platform and the ON / OFF state of the changeover switch, upper / close switch, lower / open switch, folded state detection sensor, drawer state detection sensor and retracted state detection sensor at this time, respectively It is process drawing. With the loading platform leaning against the guide roller in a horizontal grounding state, the changeover switch, upper / close switch, lower / open switch, folded state detection sensor, drawer state detection sensor and retracted state detection sensor ON / OFF It is an operation process figure which shows each an OFF state. When the loading platform is raised to the retracted level below the floor, the changeover switch, upper / close switch, lower / open switch, folding state detection sensor, drawer state detection sensor and retracted state detection sensor are turned ON / OFF. It is an operation process figure which shows each an OFF state. The state in which the loading platform is retracted to the retracted position, and the ON / OFF state of the changeover switch, the upper / close switch, the lower / open switch, the folded state detection sensor, the withdrawal state detection sensor, and the storage state detection sensor at this time FIG. The state in which the loading platform is pressed against the pad of the slide rail and the lock mechanism is engaged, and the changeover switch, upper / close switch, lower / open switch, folding state detection sensor, drawer state detection sensor, and retracted state at this time It is an operation process figure which shows the ON / OFF state of a detection sensor, respectively. It is a timing chart which shows the operation timing of a slide cylinder and a lift cylinder at the time of retracting a loading platform to a retracted position. Shows the stowed and stowed state of the loading platform and the ON / OFF states of the changeover switch, upper / close switch, lower / open switch, folding state detection sensor, drawer state detection sensor, and storage state detection sensor at this time, respectively. It is an operation process figure. Leveling the loading platform from the stowed stowed state to the open state and the ON / OFF of the changeover switch, upper / close switch, lower / open switch, folding state detection sensor, drawer state detection sensor, and storage state detection sensor It is an operation process figure which shows a state, respectively. The state in which the loading platform is raised to the floor level, and the ON / OFF state of the changeover switch, the upper / close switch, the lower / open switch, the folding state detection sensor, the drawer state detection sensor, and the storage state detection sensor at this time FIG. The stowed stowed state when the loading platform is closed from the horizontal state, and ON / OFF of the changeover switch, upper / close switch, lower / open switch, folding state detection sensor, drawer state detection sensor, and storage state detection sensor at this time It is an operation process figure which shows a state, respectively.

Explanation of symbols

A van car (vehicle)
b2 Floor C Handling equipment G Ground 3 Loading platform (movable unit)
11 Slide member (movable unit)
27 Lift cylinder (lifting drive means, movable unit)
45 Fixed frame (vehicle body side fixing member)
49 Slide cylinder (drive-in / out drive means)
6 Locking mechanism (holding means)
74 Pad (buffer member)
84 Storage state detection sensor (detection means)
85 Detection dock (detection means)

Claims (4)

A vehicle loading / unloading device that is provided in a vehicle and that lifts and lowers the load when loading / unloading the load on the loading platform of the vehicle,
A movable platform including a loading platform on which a load is placed, and an elevating drive means for raising and lowering the loading platform between a ground surface and a floor surface of the loading platform;
A loading / unloading drive means for moving the movable unit between a use position protruding rearward of the vehicle from the loading platform and a retracted position below the floor surface by moving the movable unit;
A vehicle body side fixing member that is fixed to the vehicle body side and abuts on the movable unit when the loading platform reaches the retracted position;
Detecting means for detecting the movable unit at a position before the loading platform reaches the retracted position;
When the loading platform is pulled in to the pull-in position by the loading / unloading driving means, the loading / unloading driving means is stopped after a predetermined time has elapsed after the movable unit is detected by the detecting means. apparatus. The vehicle loading / unloading apparatus according to claim 1,
The vehicle handling apparatus, wherein the movable unit and the vehicle body side fixing member are in contact with each other via a buffer member. In the vehicle loading and unloading apparatus according to claim 1 or 2,
The vehicle loading and unloading apparatus according to claim 1, wherein the loading platform functions as a bumper when the loading platform is stored in the retracted position. In the vehicle loading / unloading device according to any one of claims 1 to 3,
Holding means for holding the loading platform below the floor;
A vehicle loading apparatus that holds the loading platform in a retracted state by pulling the loading platform to the retracted position and then raising the loading platform by the lift driving means and engaging the holding platform.

Images