JP2010184510A - Underfloor storage type cargo handling device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply release engagement of a hook into a loading platform without separately providing a hydraulic cylinder. <P>SOLUTION: An engagement pin 52 is protruded toward the basal end of a lift arm 21, and the hook 79 is rotatably and pivotally supported on a mechanism frame 9. When the loading platform 3 is pulled to an underfloor storage position, a hook portion 79a of the hook 9 is moved to below the engagement pin 52 by the pull-in operation, and the descent of the lift arm 21 is regulated by engagement action with the engagement pin 52. On the other hand, when the loading platform 3 is pulled from below a floor surface b2 to a pull-out position, by descent regulation release means (a pad 76, a lever 83, and a coil spring 85) operated interlockingly with the pull-out operation, the hook 79 is turned and withdrawn from the engagement pin 52, thereby permitting the descent of the lift arm 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of an underfloor retractable loading / unloading device in which a loading platform for loading and unloading a load when loading / unloading a load in a vehicle is stored below the floor surface of the loading platform when not in use. This relates to measures to prevent the fall of

  In Patent Document 1, a hook is provided on the vehicle body fixed side below the floor surface of the loading platform, and the hook is automatically engaged with the loading platform by storing operation (retraction operation) of the loading platform. A cargo handling device is known (see, for example, Patent Document 1).

In the loading / unloading device disclosed in Patent Document 1, even if an attempt is made to drop the loading platform when the hydraulic pressure is lower than a set value due to an oil leak or the like due to an oil leak or the like in the hydraulic system that raises or lowers the loading platform, the loading platform is dropped by the engaging action of the hook. Can be prevented.
JP 2007-76484 A (paragraph 0033 column to paragraph 0035 column, FIGS. 9 and 10)

  However, in the above-mentioned Patent Document 1, the hook is automatically engaged with the loading platform by a retracting operation (retraction operation). However, when the loading platform is pulled out from below the floor surface of the loading platform during use, The hook must be removed from the loading platform by extending the hydraulic cylinder, which takes time and increases the cost of manufacturing the hydraulic cylinder separately.

  The present invention has been made in view of this point, and an object of the present invention is to easily disengage the hook from the loading platform without providing a hydraulic cylinder separately.

  In order to achieve the above object, the present invention is characterized in that the hook is automatically engaged and disengaged with respect to the loading platform in conjunction with the loading / unloading operation of the loading platform.

  Specifically, the present invention provides a mechanism frame that can move horizontally along a slide rail provided on the vehicle body fixed side below the floor surface of the loading platform, and a vertically movable structure having a base end pivotally connected to the mechanism frame. A lift arm, and a loading platform pivotally supported at the tip of the lift arm. The loading platform is moved in and out of the floor of the loading platform by horizontal movement of the mechanism frame. The following solution was taken for a vehicle under-floor retractable cargo handling device that moves up and down between the floor level and the ground by vertical movement.

  That is, according to the first aspect of the present invention, an engagement pin protrudes from either one of the base end side of the lift arm and the mechanism frame, and the other can be engaged with the engagement pin. A hook having a portion is pivotally supported, and when the loading platform is pulled into the storage position below the floor, the hook moves to the upper side or the lower side of the engagement pin by the pulling operation. While the lowering of the lift arm is restricted by the engaging action with the mating pin, when the loading platform is pulled out from below the floor surface to the pulling position, the hook is rotated by the lowering restriction releasing means that operates in conjunction with the pulling operation. The lift arm is allowed to descend by being retracted from the engagement pin.

  According to a second aspect of the present invention, in the first aspect of the present invention, the hook is in a non-contact state with the engagement pin when the hook is retracted under the floor of the loading platform.

  According to a third aspect of the present invention, in the first aspect of the invention, the lowering restriction release means includes a first lowering restriction release means on the mechanism frame side, and a second lowering restriction release means on the slide rail side. It is characterized by comprising.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the engagement pin projects from a proximal end side of a lift arm, the hook is pivotally supported by a mechanism frame, and the first lowering is performed. The restriction release means includes a lever provided integrally with the hook and a hook portion of the hook positioned below the engaging pin until the loading platform is pulled out from the floor surface to the pulling position. Biasing means for constantly biasing the lever, and the second descent restriction releasing means is adapted to push the lever by contacting the lever when the loading platform is pulled out from below the floor surface to the pulling position. It is characterized by comprising posture holding means that rotates against the urging force of the biasing means and holds the posture retracted from the engagement pin.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the lower end of the lever is not attached to the mechanism frame until the lever comes into contact with the posture holding means in the process of pulling out the loading platform. Positioning means for setting the engagement position between the hook and the engagement pin by contacting is provided.

  According to a sixth aspect of the present invention, in the first aspect of the present invention, the engagement pin protrudes from a proximal end side of a lift arm, the hook is pivotally supported by a mechanism frame, and is mounted on the mechanism frame. Is provided with a raising stopper for restricting the lift arm from moving upward when the loading platform is raised to the floor level of the loading platform.

  According to the first aspect of the present invention, when the loading platform is stored under the floor, the engaging pin and the hook are positioned up and down by the retraction operation. When the hydraulic pressure falls below a set value and the loading platform is about to fall, the hook flange engages with the engagement pin to restrict the lowering of the lift arm, thereby preventing the loading platform from falling.

  On the other hand, when the loading platform is pulled out from the bottom of the floor to the pull-out position, the hook is rotated by the descent restriction release means operating in conjunction with the pull-out operation, and the hook part is retracted from the engagement pin. The lift arm is allowed to descend, allowing the use of the loading platform, i.e. the grounding of the loading platform to the ground and the raising to the floor level.

  In this manner, the hook is engaged and disengaged automatically and promptly in conjunction with the loading / unloading operation of the loading platform. Moreover, it becomes an inexpensive cargo handling apparatus without using a hydraulic cylinder exclusively for engagement and disengagement.

  According to the invention of claim 2, since the hook is separated from the engagement pin to the upper side or the lower side, the load of the loading platform is not applied to the hook, and the hook is not required to be more robust than necessary. Durability is ensured.

  According to the inventions according to claims 3 to 5, the descent restriction release means includes the first descent restriction release means on the mechanism frame side and the second descent restriction release means on the slide rail side. The first descending restricting means includes a lever and an urging means, and the second descending restricting means is provided with a posture holding means.

  Then, when the lever is urged by the urging means, the hook collar supported by the mechanism frame is lifted by the lift arm until the loading platform is pulled out from below the floor surface to the pull-out position. It is located below the engagement pin projecting from the base end side, and the loading platform is prevented from falling. Further, when the loading platform is pulled out from below the floor surface to the pull-out position, the lever comes into contact with the posture holding means and rotates against the urging force of the urging means, and the flange portion is engaged with the engagement pin. The retracted posture is retained by the posture retaining means. This allows the use of a loading platform.

  In particular, according to the fifth aspect of the present invention, in the process of pulling out the loading platform, the lower end of the lever is brought into contact with the hook by the positioning means provided in the mechanism frame until the lever comes into contact with the posture holding means. Since the engagement position with the pin is set, the loading platform is reliably prevented from falling.

  According to the sixth aspect of the present invention, when the loading platform is raised to the floor surface level of the loading platform, the engaging pin protruding from the base end side of the lift arm is in contact with the raising stopper provided on the mechanism frame. The upward movement of the lift arm is restricted. In other words, the engagement pin plays two roles of restricting the lift arm from moving upward and preventing the loading platform from falling, thereby reducing the number of parts.

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

  1 and 7 show a rear end portion of a van vehicle A as a vehicle. In the figure, reference numeral 1 denotes a chassis extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction. The chassis 1 is mounted with a box-shaped cargo bed B provided with two doors b1 with double doors on the rear surface. Below the floor surface b2 of the loading platform B, an underfloor retractable cargo handling device C according to an embodiment of the present invention is equipped.

  The cargo handling device C includes a two-fold type loading platform 3 in which a front-end platform 3a and a base-end platform 3b are connected to each other so as to be foldable and unfoldable by a hinge 4, and the loading platform 3 can be put in and out of the vehicle body. 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. A one-dot chain line in FIG. 1 shows a use state in which the loading platform 3 in a folded state is pulled out from below the floor surface b2 and developed, and the loading platform 3 is grounded to the ground G. The two-dot chain line in FIG. 1 and FIG. 7 show the underfloor storage state in which the loading platform 3 is folded and retracted below the floor surface b2. A solid line in FIG. 1 shows a stowed and stowed state in which the loading platform 3 is leaned perpendicularly to the rear surface of the loading platform B (opening / closing door b1). 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 are horizontally disposed on the rear end side of the chassis 1 on the vehicle body fixing side so as to extend in the longitudinal direction of the vehicle body below the floor surface b2 of the loading platform B. A mechanism frame 9 having a closed cross-sectional shape extending in the vehicle width direction is supported through a slide member 11 so as to be horizontally movable in the longitudinal direction of the vehicle body along the slide rail 7. Two large and small first and second support brackets 13 and 15 are fixed to both ends of the mechanism frame 9 so as to be positioned on the outer side of the slide rail 7.

  The parallel link mechanism 5 includes a tilt arm 19 whose upper end is pivotally connected to the first support bracket 13 having a larger shape among the first and second support brackets 13 and 15 by a connecting shaft 17 so as to be movable up and down. . Near the upper end of the tilt arm 19, the base end of the lift arm 21 is pivotally connected to the connecting shaft 23 so that the base end of the lift arm 21 is interposed via the tilt arm 19 and the first support bracket 13. The mechanism frame 9 is pivotally connected. The tip of the lift arm 21 is pivotally connected to the base platform 3 b by a connecting shaft 25 so that the loading platform 3 is pivotally supported by the tip of the lift arm 21.

  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 connected to the lower end of the tilt arm 19 by a connecting shaft 29 and is connected to a piston. The tip of the rod 27b is pivotally connected to the lift arm 21 near the tip of the lift arm 21 so as to be movable up and down. A cylinder tube 33a base end of a hydraulic tilt cylinder 33 is pivotally connected to the second support bracket 15 by a connecting shaft 35, and the tip end of the piston rod 33b is connected to the base end of the base end side platform 3b. The shaft 37 is pivotally movable so as to move up and down.

  As shown in FIG. 2, the mechanism frame 9 is provided with a plurality of connecting frames 39 projecting toward the rear of the vehicle body. The connecting frame 39 includes a central bumper member 41a and a central bumper member 41a. Side bumper members 41b located on both the left and right sides are connected to each other. The parallel link mechanism 5 is disposed between the central bumper member 41a and the side bumper member 41b. The reason why the bumper member is divided into the central bumper member 41a and the side bumper member 41b is 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 member 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.

  A fixed frame 45 is bridged via a bracket 47 on the end side (front side of the vehicle body) of the two slide rails 7 in the retracting direction. 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 member 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. The mechanism frame 9 is horizontally moved in the longitudinal direction of the vehicle body by the expansion and contraction operation of the slide cylinder 49, and the loading platform 3 in a folded state is put into and out of the floor surface b2 of the loading platform B.

  Then, by cooperation of the two sets of parallel link mechanisms 5 and the slide cylinders 49, that is, by synchronously operating the two sets of parallel link mechanisms 5, the load platform 3 in the folded state is put into the slide cylinders 49 in use. Is pulled out from below the floor surface b2 of the loading platform B by the expansion operation of the loading platform B, and is lifted up and down in a horizontal posture between the ground G and the floor surface b2 level of the loading platform B by the expansion and contraction operation of the lift cylinder 27 in a state where the load is placed. The cargo is loaded and unloaded from the loading platform B (see FIG. 12). At this time, the lift arm 21 pivots upward toward the rear of the vehicle body when the loading platform 3 in the deployed state is lifted in a horizontal posture, while the lift platform 21 is lowered in the horizontal posture. When it is made to move, it turns to the front downward toward the rear of the vehicle body.

  A rising stopper 51 is attached to the upper end of the first support bracket 13. That is, the rising stopper 51 is attached to the mechanism frame 9 via the first support bracket 13. On the other hand, on the base end side of the lift arm 21, an engagement pin 52 that can engage with a flange 79a of a hook 79, which will be described later, projects inward in the vehicle width direction (see FIGS. 3 to 6). When the loading platform 3 rises to the level of the floor surface b2 of the loading platform B, the engagement pin 52 abuts against the ascending stopper 51 to regulate the upward movement of the lift arm 21, and the loading platform 3 is loaded. 3 is prevented from rising further (see FIG. 12).

  On the other hand, when the loading platform 3 is stored, the folded loading platform 3 is pulled under the floor of the loading platform B from the retracting level immediately before it interferes with the slide rail 7 below the floor b2 by the contraction operation of the slide cylinder 49 (FIG. 8). The loading platform 3 in the unfolded state is leaned against the door b1 of the loading platform B in a vertical posture by the extension operation of the tilt cylinder 33 from the floor surface b2 level (see the solid line in FIG. 1 and FIG. 13).

  When the former is stored under the floor, the loading platform 3 is pushed to the slide rail 7 by the extension operation of the lift cylinder 27 from the state where the loading platform 3 is pulled down below the floor surface b2 at the pull-in level so as not to rattle. A pad 53 made of a cushioning material such as resin or rubber is disposed near the rear end of the vehicle body on the lower surface of the slide rail 7 (see FIGS. 7, 8, and 14). The pad 53 is a folded loading platform. 3, the back surface of the front end side platform 3a is pressed. When the vehicle is stored under the floor, the rear end portions of the distal end platform 3a and the proximal end platform 3b that are folded and overlapped vertically function as a rear bumper of the van A. On the other hand, when the latter is stood and stowed, the central bumper member 41a and the side bumper member 41b protrude rearward of the vehicle body and exhibit a bumper function.

  Further, the two tilt arms 19 of the two parallel link mechanisms 5 rotate around the connecting shaft 17 in the 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 to ground the entire loading platform 3 to the ground G (see the two-dot chain line in FIG. 11). 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. As a result, the loading platform 3 is moved. It rotates around the connecting shaft 37 and is grounded in a forward inclined posture. Both the tilt arms 19 are rotated in a direction away from the mechanism frame 9 by the weight of the loading platform 3 or by a total load obtained by adding the load of the load to the loading platform 3 so that the front end of the loading platform 3 is lowered downward. The entire loading platform 3 may be grounded to the ground G by tilting.

  In the vicinity of the hinge 4 of the proximal platform 3b of the loading platform 3, a folding state detection sensor 57 composed of a proximity sensor is fixed, and on the hinge shaft 59 of the hinge 4 on the proximal platform 3b side. The detection dock 61 is fixed. The detection dock 61 approaches the folded state detection sensor 57 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 folded state detection sensor 57 is turned on to detect the folded state of the loading platform 3. Contrary to the above, the folding state detection sensor 57 may be fixed to the hinge 4 (hinge shaft 59), while the detection dock 61 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, a pull-out state detection sensor 63 composed of a proximity sensor is fixed, while at the end of the slide rail 7 in the pull-out direction (rear end of the vehicle body), a detection dock 65 is interposed via a bracket 67. Is fixed. A contact rod 69 is fixed to the slide member 11 below the pull-out state detection sensor 63, and a stopper 71 is fixed to the outer surface of the slide rail 7 below the detection dock 65. When the slide member 11 is moved to the drawer position at the rear end of the vehicle body by the extension operation of the slide cylinder 49 and the abutment rod 69 abuts against the stopper 71, the withdrawal state detection sensor 63 approaches the detection dock 65. Thus, the pull-out state detection sensor 63 is turned on to detect that the loading platform 3 has been pulled out from below the floor surface b2 to the pull-out position. Contrary to the above, the drawer state detection sensor 63 may be fixed to the slide rail 7 side, while the detection dock 65 may be fixed to the slide member 11. Furthermore, a limit switch may be employed instead of the proximity sensor.

  The mechanism frame 9 is fixed with a storage state detection sensor 73 composed of a proximity sensor, while the fixed frame 45 is fixed with a detection dock 75. 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 73 approaches the detection dock 75 and the storage state detection sensor 73 is turned on. Then, it is detected that the loading platform 3 is retracted to the retracted position below the floor surface b2 at the retracting level. Contrary to the above, the storage state detection sensor 73 may be fixed to the fixed frame 45, while the detection dock 75 may be fixed to the mechanism frame 9. Furthermore, a limit switch may be employed instead of the proximity sensor.

  At the left end of the mechanism frame 9 in the vehicle width direction, a power unit 77 including an electric motor, a hydraulic pump, a solenoid valve and the like (not shown) is disposed (see FIG. 1), and the cargo handling device C is driven by the power unit 77. Like to do. The power unit 77 is a unit in which main driving hydraulic circuit elements of the cargo handling device C are unitized and housed in a housing. In FIG.

  As shown in FIGS. 3 to 6, on the slide member 11 below the contact rod 69, a hook 79 having a flange portion 79 a with which the engagement pin 52 can be engaged is rotatable by a support shaft 81. It is pivotally supported. That is, the hook 79 is pivotally supported on the mechanism frame 9 via the slide member 11.

  A lever 83 is disposed on the surface of the slide member 11 opposite to the hook 79 (inner side surface in the vehicle width direction), and the middle of the lever 83 is pivotally connected by the hook 79 and the support shaft 81. Yes. The lower end of the lever 83 is connected to one end of a coil spring 85 as urging means, and the other end of the coil spring 85 is connected to the slide member 11. As a result, the lever 83 is always urged to rotate clockwise in FIG. 4 (counterclockwise in FIG. 6) by the spring force of the coil spring 85. The lever 83 and the coil spring 85 constitute a first descent restriction releasing means on the mechanism frame 9 side.

  Under the lever 83 of the mechanism frame 9, an adjusting bolt 87 as a positioning means is disposed, and in the process of pulling the loading platform 3 from the bottom of the floor surface b2 to the pulling position (see FIGS. 7, 8, and 14). Until the lever 83 comes into contact with a pad 76, which will be described later, the lever 83 is urged by the spring force of the coil spring 85, and its lower end comes into contact with the adjustment bolt 87 to be in a substantially vertical position. The engagement position between 79 and the engagement pin 52 is set. Specifically, when the loading platform 3 is retracted to the storage position below the floor, the hook 79a of the hook 79 moves to the lower side of the engagement pin 52 by the retraction operation and is not in contact with the engagement pin 52. And the lowering of the lift arm 21 is restricted by the engaging action with the engaging pin 52.

  On the other hand, a pad 76 made of resin is arranged on a surface opposite to the stopper 71 of the slide rail 7 (inner side surface in the vehicle width direction) via a support member 78 (FIGS. 3, 5 and 6, etc.). reference). When the loading platform 3 is pulled out from the bottom of the floor surface b2 to the drawing position (see FIGS. 9 to 13), the upper end of the lever 83 abuts against the lower surface of the pad 76, and the movement is restrained. 4 is rotated counterclockwise in FIG. 4 (clockwise in FIG. 6) against the spring force of the spring 85, and the hook 79a of the hook 79 is retracted from the engagement pin 52 to the rear side of the vehicle body. The lift arm 21 is configured to be allowed to descend. Therefore, when the loading platform 3 is pulled out from the bottom of the floor surface b2 to the drawing position, the pad 76 holds posture holding means (second slide restriction on the slide rail 7 side) that holds the retracted posture from the engaging pin 52 of the lever 83. Means). The first descent restriction release means (lever 83, coil spring 85) and the second descent restriction means (pad 76) constitute descent restriction release means that operates in conjunction with the pull-out operation of the loading platform 3. ing.

  The posture of the lever 83 is performed by adjusting the protruding amount of the adjustment bolt 87. The positions of the pad 76 and the support member 78 are also determined by selecting one of the plurality of adjustment holes 7a (see FIG. 6) drilled in the slide rail 7.

  Next, the operation of the cargo handling device 7 configured as described above will be described by taking <drawing operation> and <closing operation to the stowed storage state> as examples. The numbers given in parentheses below indicate the procedure of the operation process. The storing operation may be performed in the reverse order of the above operations.

<Drawer operation>
(1) FIG. 7 shows the retracted state of the loading platform 3. In this retracted state, the lift cylinder 27 is extended and the slide cylinder 49 is contracted, and the back surface of the folded loading platform 3 is pressed against the pad 53 of the slide rail 7. Yes. In this state, both the folding state detection sensor 57 and the storage state detection sensor 73 are ON, and the drawing state detection sensor 63 is OFF.

  (2) To pull out the loading platform 3 from this retracted state, the switch (not shown) is lowered, and the lift cylinder 27 stops after being slightly contracted, and the loading platform 3 is moved to FIG. As shown, the slide rail 7 is slightly lowered to a height (retraction level) that does not interfere with the pad 53 on the lower surface of the slide rail 7 and stopped, and the pressure on the slide rail 7 (pad 53) is released. Following this, the slide cylinder 49 is extended to start pulling out the loading platform 3. As a result, the storage state detection sensor 73 moves away from the detection dock 75 and the detection signal is turned off. Such an operation is based on program information preset in a controller (not shown). The operation described below is also the same.

  (3) If the switch lowering operation is kept held, the contact rod 69 comes into contact with the stopper 71 as shown in FIG. 9, and the drawer state detection sensor 63 approaches the detection dock 65 and A detection signal (ON signal) is input to the controller, and on this condition, the extension operation of the slide cylinder 49 stops and the pulling out of the loading platform 3 stops, and the lift cylinder 27 starts the contraction operation. The stacking platform 3 starts to descend in the folded state.

  (4) When the loading platform 3 begins 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 57 is separated from the detection dock 61 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 switch lowering operation is stopped. As a result, the contraction operation of the lift cylinder 27 is stopped. After that, as shown in FIG. 11, the tip side platform 3a is held by hand and deployed.

  (6) The switch is lowered again (ON operation), the lift cylinder 27 is contracted again, and the loading platform 3 is tilted to the ground (tilt) as shown in FIG. Load.

  (7) Raise the switch. Thus, when the lift cylinder 27 is extended and the loading platform 3 is raised to the level b2 of the loading platform B, the engagement pin 52 of the lift arm 21 comes into contact with the raising stopper 51 and stops (see the solid line in FIG. 12). ). In this state, the luggage is loaded on the loading platform B.

  (8) When the loading operation is repeated, the lift cylinder 27 is contracted by the switch lowering operation, and the empty loading platform 3 is lowered in the unfolded state. Thereafter, the loading operation is performed by repeating the steps (6) to (8).

<Close operation to the stowed storage state>
(1) The switch is operated by raising the switch from the horizontal grounding state (see the solid line in FIG. 11) or the tilting grounding state (see the two-dot chain line in FIGS. 11 and 12) of the loading platform 3. Thereby, the lift cylinder 27 starts to extend, and the loading platform 3 starts to rise. As shown by the solid line in FIG. 12, when the loading platform 3 is raised to the floor surface b <b> 2 level of the loading platform B, the engagement pin 52 of the lift arm 21 abuts against the raising stopper 51 and is prevented from further raising. The

  (2) Thereafter, the “platform close” operation of the switch is performed. As a result, the tilt cylinder 33 starts to extend, and the loading platform 3 starts to pivot so as to rest on the door b1 of the loading platform B.

  (3) After the loading platform 3 is rotated to the standing and retracted state facing the door b1 of the loading platform B, as shown in the solid line of FIG. 1 and FIG. 13, the “platform closing” operation of the switch is performed. End.

  In such an operation, in this embodiment, the engagement pin 52 is projected from the proximal end side of the lift arm 21 and the hook 79 is pivotally supported on the mechanism frame 9 so that the loading platform 3 is only stored in the underfloor state. Even when the loading platform 3 is pulled out from the bottom of the floor surface b2 to the pull-out position, the lever 83 is biased by the spring force of the coil spring 85, so that the hook 79a of the hook 79 is located below the engaging pin 52. Therefore, even if the hydraulic system falls below a set value due to oil leakage or the like due to an oil leak or the like in the hydraulic system that raises or lowers the loading platform 3, the hook 79a of the hook 79 is moved to the engagement pin. 52, the lowering of the lift arm 21 can be regulated, and the loading platform 3 can be held so as not to fall (FIG. 1). Reference).

  In this way, the loading platform 3 is prevented from falling in the retracted state under the floor, but when the loading platform 3 is pulled out from the bottom of the floor surface b2 to the extraction position, the upper end of the lever 83 abuts against the lower surface of the pad 76. The hook 79 rotates together with the lever 83 against the spring force of the coil spring 85, and the hook 79a of the hook 79 retracts from the engagement pin 52 to the rear side of the vehicle body to allow the lift arm 21 to descend. . Thereby, the use of the loading platform 3, that is, the grounding of the loading platform 3 to the ground G and the raising to the floor surface b2 level are enabled.

  As described above, in this embodiment, the engagement and disengagement of the hook 79 with respect to the engagement pin 52 can be performed automatically and promptly in conjunction with the loading / unloading operation of the loading platform 3. Moreover, an inexpensive cargo handling apparatus can be provided without using a hydraulic cylinder dedicated for engagement and disengagement.

  In this embodiment, the hook 79 is not in contact with the engagement pin 52 except when an abnormality such as an oil leak in the hydraulic system is stored in the storage platform 3 under the floor. The load of the loading platform 3 can be prevented from being applied, and the durability can be ensured without making the hook 79 more robust than necessary.

  Further, in this embodiment, the adjustment bolt 87 is disposed on the mechanism frame 9, and the lower end of the lever 83 is placed on the adjustment bolt 87 until the lever 83 comes into contact with the pad 76 in the drawing process of the loading platform 3. Since the engagement position between the hook 79 and the engagement pin 52 is set by being brought into contact with each other, the loading platform 3 can be reliably prevented from falling.

  Furthermore, in this embodiment, when the loading platform 3 rises to the floor surface b2 level of the loading platform B, the upward movement of the lift arm 21 is restricted by bringing the engaging pin 52 into contact with the ascending stopper 51. That is, since the engagement pin 52 is used as both roles of the lifting arm 21 and the fall prevention of the loading platform 3, the number of parts can be reduced.

  In this embodiment, the engaging pin 52 protrudes from the base end side of the lift arm 21, and the hook 79 is pivotally supported on the mechanism frame 9 (sliding member 11), and the engaging pin 52 is on the upper side. The hook 79a of the hook 79 is disposed in a non-contact state on the lower side. On the contrary, the hook 79 is pivotally supported on the base end side of the lift arm 21 so that the hook 79a faces upward. The engaging pin 52 may be projected from the mechanism frame 9 (sliding member 11), and the hook 79a of the hook 79 may be disposed on the upper side and the engaging pin 52 may be disposed on the lower side in a non-contact state. Further, the hook 79a of the hook 79 and the engaging pin 52 may be arranged in contact with each other.

  The present invention is useful for an underfloor retractable cargo handling device for a vehicle that stores a loading platform below the floor surface during traveling.

FIG. 3 is a rear perspective view of the van equipped with the cargo handling device according to the embodiment, in which the loading platform is stowed and stowed with a solid line, the underfloor stowed state is a two-dot chain line, and the loading platform is grounded horizontally Are indicated by alternate long and short dashed lines. It is a perspective view of the base end side part of a cargo handling apparatus. It is a perspective view which expands and shows the base end side part in the vehicle width direction right side of a cargo handling apparatus. It is an enlarged side view which shows the positional relationship of the hook and engagement pin in the loading platform under the floor. FIG. 5 is a right side view of FIG. 4. FIG. 5 is a back equivalent view of FIG. 4 showing the positional relationship between the hook and the engagement pin in a state in which the loading platform is pulled out from the underfloor storage state. It is a back side view of the van vehicle which shows the underfloor storage state of a loading platform. It is a back side view of a van vehicle which shows the state where the loading platform was lowered from the underfloor storage state to the retracted level below the floor surface. It is a back side view of the van vehicle which shows the state which pulled out the loading platform from the underfloor storage state. It is a back side view of the van vehicle which shows the state just before the earthing | grounding of a loading platform. It is the back side view of the van vehicle which shows the use condition which grounded the loading platform horizontally by a solid line, and the use condition which grounded the whole in the inclined posture by a two-dot chain line, respectively. It is the back side view of the van vehicle which shows the use state which made the loading platform the whole ground contact in an inclined posture with a two-dot chain line, and shows the use state raised in a horizontal posture to the loading platform floor height. It is a rear side view of the van vehicle which shows the stowed stowage state of the loading platform. It is a back side view of the van vehicle which shows the fall prevention state of the loading platform of the underfloor storage state.

1 Chassis (Body fixed side)
3 Loading platform 7 Slide rail 9 Mechanism frame 21 Lift arm 51 Lifting stopper 52 Engaging pin 76 Pad (posture holding means, second lowering restriction releasing means)
79 hook 79a collar 83 lever (first descending restriction release means)
85 Coil spring (biasing means, first descent restriction releasing means)
87 Adjustment bolt (positioning means)
B Loading platform b2 Floor C Handling equipment G Ground

Claims (6)

A mechanism frame that can move horizontally along a slide rail provided on the vehicle body fixed side below the floor of the loading platform;
A vertically movable lift arm having a base end pivotally connected to the mechanism frame;
A loading platform pivotally supported at the tip of the lift arm;
A vehicle-underfloor retractable cargo handling device that moves the loading platform in and out of the floor surface of the loading platform by moving the mechanism frame horizontally and moves up and down between the floor level and the ground by the vertical movement of the lift arm. Because
An engagement pin protrudes from either the base end side of the lift arm or the mechanism frame, and a hook having a flange portion engageable with the engagement pin is pivotally supported on the other side. And
When the loading platform is pulled into the storage position below the floor, the hook flange moves to the upper side or the lower side of the engagement pin by the pulling operation, and the lift arm is lowered by the engagement action with the engagement pin. On the other hand, when the loading platform is pulled out from the bottom of the floor surface to the pull-out position, the hook is rotated by the lowering restriction releasing means that operates in conjunction with the pull-out operation, and is retracted from the engagement pin to thereby lift the lift An underfloor retractable cargo handling device for a vehicle, characterized in that the arm is allowed to descend. The underfloor retractable cargo handling device for a vehicle according to claim 1,
The vehicle underfloor retractable cargo handling device according to claim 1, wherein the hook is in a state of being stored under the floor of the loading platform and is not in contact with the engagement pin. The underfloor retractable cargo handling device for a vehicle according to claim 1,
The descent restriction release means includes first descent restriction release means on the mechanism frame side,
The underfloor retractable cargo handling device for a vehicle comprising the second descent restriction release means on the slide rail side. The underfloor retractable cargo handling device for a vehicle according to claim 3,
The engagement pin protrudes from the proximal end side of the lift arm, and the hook is pivotally supported by the mechanism frame.
The first descent restriction release means includes a lever provided integrally with the hook;
A biasing means for constantly biasing the lever so that the hook portion of the hook is positioned below the engagement pin until the loading platform is pulled out from below the floor surface to the pulling position;
The second descent restriction release means is configured to rotate the lever against the urging force of the urging means by contacting the lever when the loading platform is pulled out from below the floor surface to the drawing position. An underfloor retractable cargo handling device for a vehicle, comprising posture holding means for holding the posture retracted from the combined pin. The underfloor retractable cargo handling device for a vehicle according to claim 4,
Positioning means for setting the engagement position between the hook and the engagement pin by the lower end of the lever abutting until the lever abuts on the posture holding means in the process of pulling out the loading platform. An underfloor retractable cargo handling device for a vehicle, wherein: The underfloor retractable cargo handling device for a vehicle according to claim 1,
The engagement pin protrudes from the proximal end side of the lift arm, and the hook is pivotally supported by the mechanism frame.
The mechanism frame is provided with a rising stopper for restricting the lift arm from moving upward when the loading platform is raised to the floor level of the loading platform. Underfloor retractable cargo handling equipment.

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