JP2017030423A5 - - Google Patents

Description

Loading platform lifting device

  The present invention relates to a load receiving table lifting device mounted on a vehicle, and more particularly to a load receiving table lifting device housed under a load box.

  Some load receiving platform lifting devices mounted at the rear of the vehicle are housed below the packing box. One example is a load receiving table lifting device 90 shown in FIG. 6 (a). The load receiving table 91 is supported by a pair of left and right link arms 92, and when used, moves up and down between the ground and the packing box B90 along an arrow A91. To do. At the time of the storage, the load receiving table 91 is in a state where the tip 91a is folded to the base 91b (arrow A92).

  As shown in FIG. 6 (b), the load receiving table 91 that is folded and stored projects in the vicinity of the pair of left and right hinges 93, but has a horizontally long shape under the load box B90, Also functions as a bumper.

  As shown in FIG. 6C, the stored load receiving table 91 is in a state that does not protrude toward the vehicle rear side (right side in the drawing) with respect to the packing box B90. Most of the upper surface of the load receiving platform 91 in the storage state is a flat surface portion 910, and depending on the type of luggage, an operator puts his / her legs directly on the flat surface portion 910 without using the load receiving table lifting / lowering device 90. It is also possible to move to the packing box B90. In such a case, in order to prevent the operator from slipping, there is a process in which the surface of the flat surface portion 910 is projected in a row (for example, Patent Document 1).

Japanese Patent No. 4037400

  However, when the load receiving platform 91 is in the retracted state, it sinks under the load box B90 and does not protrude toward the vehicle rear side from the load box B90. Therefore, when the worker puts his leg on the flat surface portion 910, the worker The center of gravity is closer to the rear side of the vehicle, and it is difficult to move to the packing box B90. Moreover, if it is in the accommodated state, when the operator gets out of the packing box B90, the receiving platform 91 cannot be visually recognized.

  By the way, when using the load receiving table lifting device 90, the operator pulls the stored load receiving table 91 to the work position at the rear of the vehicle, so that the pulling operation can be stopped halfway. However, it is troublesome to actually stop the drawing operation at a halfway position as follows.

  First, a pull-out operation of the load receiving platform 91 is performed by operating a button of a wired or wireless operation unit. When the load receiving platform 91 is pulled out only for placing a leg, a slight protrusion amount is sufficient, but the protrusion is unexpectedly greatly protruded. In addition, it takes a lot of time for the storage time after storage.

  Further, in a normal use in which the load receiving platform lifting / lowering device 90 is not stopped halfway, the movement of the load receiving tray 91 from the storage position to the grounded position can be completed with only one button operation (for example, by pressing the “down” button). . However, when the button is pressed for a long time, not only the sliding operation passing through the intermediate position but also the lowering operation is performed, and the relative height with respect to the cargo box B90 is lowered.

  Therefore, if a careful button operation is performed in order to surely stop at an intermediate position, the button operation itself of the operation unit becomes complicated. For example, it is very complicated and undesirable for an operator to perform an intermittent button operation to carefully pull out.

  Furthermore, since the load receiving platform 91 is housed below the cargo box B90, in order to clearly discriminate a predetermined amount of protrusion, it is required that the operator stands directly at the rear end of the vehicle and visually recognizes it. It is done. That is, the worker's standing position is limited.

  The present invention has been made in view of these points, and an object of the present invention is to provide a load receiving table lifting device that allows an operator to easily and reliably use a load receiving table housed below a load box as a step.

  In the present invention, the following means are used.

  A control unit that is mounted on the rear side of the vehicle and is used for loading and unloading luggage, and that has a load receiving base that is stored below the cargo box of the vehicle, and that can be controlled to pull out the stored load receiving base to the rear side of the vehicle. It is intended for the loading platform lifting device provided.

  The control unit is configured such that the movement of the cargo cradle can be regulated regardless of the input of a drawer signal to the cargo cradle. Here, “regulation” means stopping the drawer movement.

  Further, the control unit is configured to be capable of lowering control for lowering the load receiving table, and further, the control unit moves to the position where the stored load receiving table is grounded via the lowering control. The first drawer control to be performed and the second drawer control capable of regulating the drawer of the cargo receiving table may be employed.

  In addition, a configuration may be provided that includes a first operation unit that outputs a pull-out signal for the first pull-out control and a second operation unit that outputs a pull-out signal for the second pull-out control.

  The control unit may be configured such that when the operation signal of the second operation unit is input, the operation signal of the first operation unit is disconnected. Furthermore, provided on the vehicle side, a detection means for detecting movement in the vehicle front-rear direction and outputting a detection signal to the control unit when an operation signal of the second operation unit is input is provided, The control unit may be configured to restrict movement of the load receiving table in the vehicle front-rear direction based on the detection signal. In addition, by the drawer control that pulls out the stored load receiving table to the rear side of the vehicle, it is pulled out to a working position that moves up and down between the cargo box and the ground. A configuration is also possible in which the cargo cradle protrudes from the rear end portion of the box to the vehicle rear side and is located at a midway position on the vehicle front side from the work position. In the above configuration, the load receiving platform is stored in the storage position in a state of being folded in the vehicle front-rear direction, and is pulled out in the substantially same folded state from the storage position to a position where the drawer of the load receiving table can be regulated. The structure which can be applied is also applicable.

  According to the load receiving table elevating device of the present invention, since the control unit that restricts the movement of the load receiving table is provided, the load receiving table can be reliably stopped at a predetermined position. For this reason, the load receiving table does not protrude to the rear side of the vehicle, and pull-in does not take more time than necessary. Further, since the movement is restricted, the cargo receiving platform can be stopped at the predetermined position even when the button operation relating to the drawer is unexpectedly lengthened. Therefore, the receiving platform can be stopped at a predetermined position by a simple operation of simply pressing the button. And even if it does not look at the state where a load receiving stand is pulled out strictly, since a load receiving stand can be stopped in a predetermined position, an operator's standing position is not restricted more than necessary.

It is a side view of the load receiving table raising / lowering apparatus which concerns on embodiment of this invention, and the state where the load receiving stand moves from a storage position to a work position, and also to a grounding position is shown. (A) is a hydraulic circuit diagram of the load receiving table elevating device according to the embodiment of the present invention, (b) is a block diagram showing the control related to the operation of the load receiving device elevating device. (A) is a timing chart which shows pulling-out control of the receiving stand which concerns on embodiment of this invention, (b) is a timing chart which shows pulling-in control of the receiving stand which concerns on the form. It is a side view of the load receiving platform raising / lowering apparatus which concerns on embodiment of this invention, and the state which a load receiving stand moves between a storage state and a step position is shown. (A) is a flowchart which shows the movement control between the stowage state and a step state by the load receiving stand which concerns on embodiment of this invention, (b) is a timing chart which shows the movement control. It is the side view and rear view which show the working state and storage state of the load receiving stand raising / lowering apparatus which concerns on the conventional embodiment.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a load box B mounted on a vehicle and a load receiving platform lifting device 100 mounted below the load box B at the rear of the vehicle. The load receiving platform lifting / lowering device 100 includes a case where the load receiving platform 1 is used to load a load for loading and unloading a load, and a case where an operator uses the load receiving platform 1 as a step member by placing a leg. It is configured to be able to use motion control properly.

  In FIG. 1, the load receiving platform lifting / lowering device 100 changes from the housed state to a state in which luggage can be loaded and unloaded in the order of FIGS. 1 (a) to 1 (e), and operates the changed state. The first operation unit R1 used by the operator is also displayed. In addition, a second operation unit R2 for operating a movement different from the movement in FIG. In the present embodiment, the first operation unit R1 and the second operation unit R2 are provided separately. The first operation unit R1 is used to operate a series of operations shown in FIG. 1, and the second operation unit R2 is used to operate a series of operations shown in FIG. In this figure, the left side is the front side of the vehicle, the right side is the rear side of the vehicle, and the buttons pressed in each operation are displayed in a discolored manner.

  FIG. 1A shows the load receiving table lifting device 100 in the storage position. This storage position refers to a state in which the load receiving platform lifting device 100 is stored in a state where the vehicle can travel, and as shown in the drawing, the storage position is slightly pulled forward from the rear end of the cargo box B. In addition, the load receiving table elevating device 100 in the storage position also functions as a vehicle bumper.

  The load receiving platform lifting device 100 is provided at the rear of the vehicle frame C with the longitudinal direction of the vehicle in the longitudinal direction and below the load box B mounted on the vehicle frame C. The load receiving table 1 and the load receiving table 1 are foldable. Is provided with a slide drive unit 2 that moves the vehicle back and forth, a lift drive unit 3 that raises and lowers the load receiving platform 1, and a control unit (not shown) that controls the drive of these drive units 2 and 3. The load receiving platform 1, the slide drive unit 2, and the elevating drive unit 3 have a known configuration (for example, JP 2013-208942 A), and can move the load receiving platform 1 in the vehicle front-rear direction or the vertical direction.

  The slide drive unit 2 includes a pair of left and right guide rails 21, left and right sliders 22, a connecting member 23, and left and right slide cylinders 24. The guide rail 21 is attached to the lower side of the vehicle frame C with the front-rear direction as the longitudinal direction. The slider 22 is engaged and supported by the guide rail 21 and slides along the guide rail 21. The connecting member 23 is mounted on the left and right sliders 22. Each end of the slide cylinder 24 is fixed to the guide rail 21 and the slider 22, and the slider 22 slides back and forth as the slide cylinder 24 expands and contracts. 23 also moves back and forth.

  The elevating drive unit 3 includes a left and right pair of a tilt arm 31, a lift arm 32, a compression arm 33, and a lift cylinder 34, respectively. The tilt arm 31 is rotatably connected to a bracket (not shown) whose upper end is fixed to the connecting member 23. The lift arm 31 is rotatably connected to the tilt arm 31 at the front end and to the load receiving platform 1 at the rear end. The compression arm 33 has a front end portion connected to the bracket and a rear end portion rotatably connected to the load receiving platform 1. The lift cylinder 34 is connected to the lower end portion of the tilt arm 31 on the rod side and to the lift arm 32 on the bottom side so as to be rotatable. The lift arm 32 and the compression arm 33 form a parallel link that connects the load receiving platform 1 to the slider 22 so as to be movable up and down, and the parallel link is driven to rotate up and down as the lift cylinder 34 extends and retracts to receive the load. The table 1 moves up and down while maintaining a horizontal posture.

  As shown in FIG. 1B, when pulling the load receiving platform 1 from the storage position to the vehicle rear side, the slider 22 is moved to the vehicle rear side along the arrow A1 by pressing the “down” button of the first operation portion R1. Slide. At this time, the load receiving platform 1 moves from the rear end portion of the packing box B to the first pull-out position protruding by a distance L1 (about 100 mm) toward the vehicle rear side.

  When the load receiving platform 1 reaches the first pull-out position and the “down” button is pressed as it is, the load receiving platform 1 is lowered along the arrow A2 as shown in FIG. And it moves to the 1st descent position which descended slightly so that it may leave the packing box B.

  When the cradle 1 reaches the first lowered position, if the “down” button is pressed as it is, the cradle 1 slides along the arrow A3 toward the rear side of the vehicle as shown in FIG. Then, it moves from the rear end portion of the cargo box B to the rear side of the vehicle by a distance L2 and moves to a second pull-out position where the load receiving platform 1 can be moved up and down.

  Further, when the “down” button is continuously pressed as it is, the load receiving platform 1 descends along the arrow A4 as shown in FIG. And it arrives at the 2nd descent | fall position where the load receiving stand 1 grounded. When the load receiving platform 1 reaches the second lowered position, the operator stops pressing the “down” button, and the “<”-shaped load receiving platform 1 is manually deployed horizontally (not shown). To.

This pull-out operation moves the load receiving platform 1 from the storage position to the ground position only by pressing the “down” button, and is a simple operation method for the operator. Then, when the “up” button of the first operating device R1 is pressed, the load receiving platform 1 can be raised while being unfolded and kept in a horizontal posture. That is, the first operating device R1 is used as a “working position operating device” that is pulled out from the storage position to the working position and moves up and down so as to pass through the working position. Further, when the load receiving platform 1 is returned to the storage position after the use of the load receiving platform lifting / lowering device 100, the operator manually folds it into the above-mentioned "<" shape and then presses the "up" button of the first operation unit R1. By pushing, the pulling-in operation that is the opposite of the above-described pulling is continuously performed. In addition, the 2nd drawer position mentioned above is a work position which the raising / lowering operation | work of the load receiving stand 1 is possible, and passes when loading / unloading a load.
The cargo receiving platform lifting / lowering device 100 according to the present embodiment includes a hydraulic drive device 4 shown in FIG.

  The hydraulic drive device 4 includes an electric motor 41, a hydraulic pump 42 driven by the electric motor 41, an oil tank 43 provided on the suction side of the hydraulic pump 42, and pressure oil in the discharge pipe 4 a of the hydraulic pump 43. From the downstream side of the first pressure oil supply passage 4b, the control valve for raising operation 44 for communicating or blocking the flow of the first pressure oil supply passage 4b, and the control valve for raising operation 44 in the first pressure oil supply passage 4b. The pressure oil return passage 4c branched and connected to the oil tank 43, the lowering control valve 45 for communicating or blocking the flow of the pressure oil return passage 4c, and the flow rate control valve Fv provided on the downstream side of the lowering control valve 45 A main relief valve Rm that regulates the maximum discharge pressure of the hydraulic pump 42, and a conductor relay (not shown) interposed between the electric motor 41 and a battery (not shown).In the present embodiment, the ascending operation control valve 44 and the descending operation control valve 45 constitute a lift cylinder control valve that controls the flow of pressure oil from the hydraulic pump 42 to the lift cylinder 34.

  In accordance with an operation signal from the first operation unit R1, power supply control from the battery to the electric motor 41 is performed via a conductor relay, and the hydraulic pump 29 is driven. At the same time, a drive command signal is appropriately input to the solenoid portions 44 s and 45 s of the control valves 44 and 45, pressure oil supply / discharge control from the hydraulic pump 29 is performed, and the lift cylinder 34 expands and contracts. As the lift cylinder 34 expands and contracts, the load receiving platform 1 is moved up and down.

  The hydraulic drive unit 4 also includes a second pressure oil supply passage 4d branched from the discharge pipe 4a of the hydraulic pump 41 and connected to the rod side of the slide cylinder 24, and a throttle valve V provided in the second pressure oil supply passage 4d. And a check valve Rv, a third pressure oil supply passage 4e branched from the second pressure oil supply passage 4d and connected to the bottom side of the slide cylinder 24, and a control for a drawing operation for communicating or blocking the flow of the pressure oil supply passage 4e. The valve 46 and the pulling-in operation for communicating or blocking the flow of the pressure oil return passage 4f branched from the third pressure oil supply passage 4e and in contact with the oil tank 43 on the downstream side of the control valve 46 for drawing operation and the pressure oil return passage 4f An operation control valve 47 is provided.

  The electric motor 41 and the hydraulic pump 42 are driven via the conductor relay in accordance with the operation signal from the first operation unit R1, so that a drive command signal is input to the solenoid unit 46s of the pull-out operation control valve 46. At this time, since the pull-in operation control valve 47 is in the shut-off position, the pressure oil from the hydraulic pump 42 is supplied to the bottom side of the slide cylinder 24 via the third pressure oil supply passage 4e, and the load receiving platform 1 is located on the vehicle rear side. Slide to. On the other hand, the sliding operation to the front side of the vehicle is driven by the electric motor 41 and the hydraulic pump 42 via the conductor relay in response to the operation signal from the first operation unit R1, so that the solenoid unit 47s of the pull-in operation control valve 47 is driven. The drive command signal is input to the. At this time, since the pull-out operation control valve 46 is in the shut-off position, the pressure oil from the hydraulic pump 42 is supplied to the rod side of the slide cylinder 24 via the pressure oil supply passage 4c, and the pressure from the bottom side of the slide cylinder 24 is Oil flows out to the oil tank 43 through the pressure oil return passage 4f. As a result, the slide cylinder 24 contracts and the load receiving platform 1 slides forward of the vehicle.

  In the present embodiment, the pressure oil return passage 4f is branched from the discharge pipe 4a to a position upstream of the pull-out operation control valve 46 and the pull-in operation control valve 47 on the downstream side of the main relief valve Rm. A bypass passage 4g connected to the. A sub-relief valve Rs and a switching valve 48 are provided in the bypass passage 4g. The switching valve 48 is controlled to communicate or shut off the pressure oil to the sub relief valve 73 by a drive signal to the solenoid drive unit 48s. The sub-relief valve Rs has a relief pressure (for example, about 6 MPa) set lower than a relief pressure (for example, about 20 MPa) of the main relief valve Rm, and the switching valve 48 is switched to the communication position to enter the discharge pipe 4a. When connected, the maximum value of the pressure oil in the discharge pipe 4a is regulated to a value lower than the relief pressure of the main relief valve Rm.

  The discharge pipe 4 a is provided with a pressure sensor 54 that detects that the load receiving table 1 is pressed against the guide rail 21. When the lift cylinder 34 extends and the load receiving platform 1 comes into contact with the guide rail 21, the pressure in the discharge pipe 4a increases. If the pressure sensor 54 detects that this pressure has exceeded a predetermined value, it can be determined that the load receiving platform 1 is in contact with the guide rail 8.

  Further, although not shown in the present embodiment, other sensors are also used. The guide rail 21 is also provided with a rear end sensor, a storage sensor, and a position sensor. The guide rail 21 is provided with front and rear stoppers (not shown) that restrict the movement range of the slider 22 in the front-rear direction.

  The rear end sensor is detection means for detecting whether or not the rear end sensor is in a position in contact with the stopper on the rear side of the slider 22 (hereinafter referred to as “rear end position”). The storage sensor has the slider 22 on the rear end position side from a predetermined position (hereinafter referred to as “intermediate position”) between a position where the slider 22 contacts the stopper on the front side (hereinafter “front end position”) and a rear end position. Detecting means for detecting whether or not. And a position sensor drives based on the operation signal from 2nd operation part R2, when an operator mounts a leg and uses the load receiving stand 1 as a step member, and it is a rear end position rather than the said intermediate position. It is a detection means which detects whether the slider 22 exists in the side. For these sensors, proximity sensors, limit switches, and the like can be used.

In addition, the above-described foldable load receiving platform 1 is provided with a folding sensor for detecting the posture (folded state) of the load receiving platform 1 at the folding hinge, and the load receiving platform 1 is detected by the detection of the folding sensor. Is determined to be in the first lowered position.
FIG. 2B is a functional block diagram illustrating a configuration example of the control unit 6 provided in the cargo receiving platform lifting apparatus 100 together with peripheral devices.

The control unit 6 is connected to the folding sensor 51, the storage sensor 52, the rear end sensor 53, the pressure sensor 54, and the position sensor 71 described above. Further, the control unit 6 includes an input unit 61 to which an output signal of these sensors 51～54,71 are input, a receiving portion 62 for receiving an operation signal from the first operation section R 1 for receiving platform lifting apparatus 100 A control program (for example, a program based on sequence control, timer control, etc.) and a storage unit (memory) 63 that stores a control threshold value, and arithmetic processing is executed in accordance with the control program stored in the storage unit 63, and each cylinder 24, 34 is executed. A calculation unit (CPU) 64 for instructing the operation of the control valve, and a command signal generated by the calculation unit 64 is transmitted to the solenoid units 44s to 48s of the control valves 44 to 48 and the above-described conductor relay (FIG. 2B). And an output unit 65 that outputs the information as appropriate. Furthermore, the control device 6, the output signals from the first operation section R 1, the presence or absence of an operation signal for sliding the receiving platform 1 on the vehicle rear side, performs connection switching of a receiver 62 and the arithmetic unit 64 A switching unit 66 is also included. The input unit 61 is also input with an operation signal from the second operation unit R2 that operates another slide operation of the load receiving platform 1.
The movement (operation) control of the cargo receiving platform 1 via the control unit 6 will be described with reference to the timing chart of FIG.
First, the pull-out operation of the cargo receiving platform 1 is as shown in FIG.

  After the main switch provided in the cab is turned on, when the operator presses the “down” button of the first operation unit R1, the conductor relay is energized to drive the electric motor 41 and the solenoid unit 46s. Is excited and the slide cylinder 24 is extended. At this time, the solenoid 47s is excited at the same time, and the pull-in operation control valve 47 is brought into communication only for an instantaneous period, so that noise generated when the slide cylinder 24 is extended can be suppressed. In the storage position, since the load receiving platform 1 is pressed against the guide rail 21, a slight pressure release is also performed to excite the solenoid portion 45s so that the operation on the rear side of the vehicle (first pulling operation) is not hindered by friction or the like. Is done by. A determination is made based on the signal from the storage sensor 52 while the cargo receiving platform 1 is being pulled out. Until the signal of the storage sensor 52 is OFF and the slider 22 reaches the intermediate position, the slider 22 is pulled out only while the “down” button is pressed, and when the “down” button operation is released, the slider 22 is stopped. .

  In the first lowering operation control, when the slider 22 reaches the intermediate position, the retracting sensor 52 is switched to OFF, so that the pulling operation control valve 46 is closed and the pulling operation of the slider 22 is stopped. Then, the electric motor 41 and the hydraulic pump 42 are stopped and the lowering control valve 45 is opened to lower the load receiving platform 1. During the first lowering operation, it is determined based on the signal from the folding sensor 51 whether the cargo receiving platform 1 has been lowered to a predetermined height. When the signal of the folding sensor 51 is switched to OFF, the operation is stopped.

  If the “down” button is pressed when the first lowering operation is stopped, the process proceeds to the second pulling-out operation. The electric motor 41 is driven again, and the pull-out operation control valve 46 is opened to pull out the slider 22. While the slider 22 is being pulled out, it is determined based on the signal from the rear end sensor 53 whether the slider 22 has reached the rear end position. When the signal of the rear end sensor 53 is switched ON, the operation is stopped.

Then, when the second pull-out operation is stopped, if the “down” button is pressed, the operation proceeds to the second lowering operation. At this time, the electric motor 41 and the hydraulic pump 29 are stopped and the lowering control valve 45 is opened to lower the load receiving platform 1 again. This lowering operation is continued while the operation signal is input from the “down” button. When the cargo receiving platform 1 is grounded and the operator stops the lowering operation, the lowering operation is stopped.
Next, the pull-in operation of the cargo receiving platform 1 is as shown in FIG.

  When performing this pulling-in operation, an operator manually folds the load receiving platform 1 into a “<” shape in advance at the ground contact position. Thereafter, the “up” button of the first operation unit R1 is pressed. When the “up” button is pressed, a first ascending operation signal is input, the conductor relay is energized to drive the electric motor 41, and the ascent operation control valve 44 is opened to raise the load receiving platform 1 ( First rise). At this time, the pull-out operation control valve 46 is opened together with the lift-up operation control valve 44, and the load receiving platform 1 is raised from the grounding position while the slider 22 is in the rear end position. While the load receiving platform 1 is in the first ascending operation, whether or not the load receiving platform 1 has reached a predetermined height, specifically, whether or not the angle of the load receiving platform 1 (the hinge portion thereof) has reached the set angle. The determination is based on the signal from the folding sensor 51. Until the load receiving stand 1 reaches the predetermined height, the load receiving stand 1 is raised only while the “up” button is pressed, and when the operation is released, the load receiving stand 1 is stopped.

  In the first ascending operation control, when the load receiving platform 1 reaches a predetermined height, the folding sensor is switched ON, the ascending operation control valve 44 is closed, and the ascending operation of the load receiving platform 1 is stopped. . When the “up” button is pressed, the pull-in operation control valve 47 is opened, and the slider 22 is pulled in while the load receiving platform 1 is held at the predetermined height. At this time, it is preferable to release the pressure of the slide cylinder 24 and the lift cylinder 34 by opening the pull-in operation control valve 47 and simultaneously opening the pull-out operation control valve 46 for a short time. During the first pull-in operation, it is determined based on the signal from the storage sensor 52 whether the slider 22 has reached the intermediate position. When the signal of the storage sensor 52 is switched ON, the operation is stopped.

  When the first pull-in operation is stopped, if the “up” button is pressed, the operation proceeds to the second ascending operation. When the slider 22 reaches the intermediate position, the pull-in operation control valve 47 is closed so that the pull-in operation (first pull-in operation) of the slider 22 is stopped, and the switching valve 48 is switched to the communication position to reduce the relief pressure. Switch to low relief pressure by relief valve Rs. Thereafter, the lifting operation control valve 44 is opened, and the load receiving platform 1 is raised again while the slider 22 is in the intermediate position. When the re-raising of the load receiving platform 1 is started, the relief pressure is not strictly reduced to the relief pressure by the sub-relief valve Rs at the time when the ascent is resumed, and the sub-relief valve Rs can be operated in a circuit. It ’s fine. During the second ascending operation, it is determined based on the signal from the pressure sensor 54 whether the load receiving platform 1 has reached an appropriate height. When the signal of the pressure sensor 54 is switched to ON, the operation is stopped. In the second raising operation, the pressing force acting between the load receiving platform 1 and the guide rail 21 is excessively increased by lowering the relief pressure of the hydraulic circuit to the low relief pressure by the sub relief valve Rs during the operation. Absent.

  And when the 2nd raising operation is made into a stop state, it shifts to the operation of the 2nd pull-in. When the detection signal from the pressure sensor 54 is input by the second ascending operation, and the detection signal recognizes that the contact pressure is equal to or higher than a predetermined pressure (for example, 40 MPa), the load receiving platform 1 reaches the height of the storage position. Recognize that. At this time, the ascent control valve 44 is closed to stop the ascending operation of the load receiving platform 1, and the slider 22 is held while holding the load receiving platform 1 at the retracted height, triggered by the contact of the load receiving platform 1 with the guide rail 21. Let them pull in.

  The second pull-in operation is an operation that is automatically instructed by the control unit 6 when the second ascending operation is completed (recognizing that the load receiving table 1 is in contact with the guide rail 21). Regardless of whether or not the first operation portion R1 is operated, the pull-in operation control valve 47 is opened and the slider 22 is pulled in. At this time, the switching valve V is closed with a slight delay (for example, 500 ms) from the time when the pull-in operation control valve 47 is opened, and the relief pressure of the hydraulic circuit is restored to the relief pressure by the main relief valve Rm. This is because the contact pressure of the load receiving platform 1 with respect to the guide rail 21 is weakened at the start of the second pull-in operation. After the load receiving platform 1 is pulled into the storage position in this way, the control unit 6 stops the electric motor 41 and the hydraulic pump 42, determines whether the power is turned off, confirms that the power is turned off, and ends the pull-in operation.

  In this embodiment, apart from the above-described “drawing operation and drawing operation” in which a baggage can be placed on the load receiving table 1 for loading and unloading of the baggage, the storage position and the work position (first pulling position) in the vehicle front-rear direction. It can also be used as a step for stopping the load receiving platform 1 at an intermediate position between the two and the operator so that an operator can put his / her legs on the stopped load receiving platform 1 and move between the load box and the ground.

Then, operation | movement of the said apparatus 100 at the time of utilizing the cargo receiving stand raising / lowering apparatus 100 as a step is demonstrated using FIG. In the drawing, the second operation unit R2 used at that time is also displayed, and the buttons pressed in each operation are displayed in a discolored manner.
4A is in a state where it does not protrude from the rear end portion of the packing box B below the packing box B, as in FIG.

  In order for the operator to use the loading platform 1 as a step, when the “exit” button (the right button in the figure) of the second operation unit R2 is pressed as shown in FIG. It reaches the step use position where the load receiving platform 1 is pulled out along the arrow A11 from the end portion to a distance L11 (about 150 mm). At this time, the load receiving platform 1 slides to the step use position while keeping the “substantially the same folded state” in the same posture and height as the storage position.

  Even after the distance L11 protrudes to the size, even if the “exit” button is pressed as shown in FIG. 4C, the load receiving platform 1 does not move to the rear side of the vehicle, and is the same size. The state protruding by the distance (distance L11) is maintained. That is, the above-mentioned “halfway position” is the step use position, and is a position where the movement of the load receiving table elevating device 100 in the vehicle front-rear direction is restricted.

  Thereafter, as shown in FIG. 4D, when the “enter” button (the left button in the figure) is pressed without pressing the “exit” button, the load receiving platform 1 is “substantially identical in its posture and height”. Slide to the stowed position in the “folded state”.

  The operation signal of the second operation unit R2 is input to the input unit 61 of the control unit 6 (see FIG. 2B). The input unit 61 also outputs a signal to the switching unit 66, and is controlled as shown in FIGS. 5A and 5B by the signal from the second operation unit R2.

  First, when the worker presses the “exit” button of the second operation unit R2 (S1), the cargo receiving platform 1 is pulled out (S2). In the control unit 6, when the input unit 61 receives an operation signal from the “out” button, the control unit 6 outputs a switching signal to the switching unit 66, and the switching unit 66 that has received this switching signal changes the connection with the receiving unit 62 from the ON state. Switch to the OFF state (see FIG. 2B). For this reason, when the drawer operation (S2) is performed, the load receiving platform 1 cannot be slid to the front side of the vehicle even if the "up" button is pressed by the first operation unit R1 to return the load receiving platform 1 to the storage position. However, even in this state, since the operation signal of the second operation unit R2 is output to the calculation unit 64 via the input unit 61 and the switching unit 66, the load receiving platform can be pressed by pressing the “ON” button (S4). 1 can be returned to the storage position (S10). In the present embodiment, since the load receiving platform 1 is pressed against the guide rail 21 at the storage position, in order to suppress the frictional force with the guide rail 21, start of step pull-out as shown in FIG. Sometimes, the lowering control valve 45 is in an instantaneous communication state and pressure relief is performed, but the load receiving platform 1 maintains the same height and the same posture in the “substantially the same folded state” as before the step pull-out start. Yes.

  When the pull-out operation by the second operation unit R2 is continued and the detection state of the position sensor 71 is turned on (S5), the pull-out operation is restricted even when the “exit” button is pressed (S6). That is, as shown in FIG. 5B, when the detection signal of the position sensor 71 is output to the input unit 61 in the control unit 6, the pull-out operation control valve 46 is cut off and the slide cylinder 24 is extended. Stop. As a result, as shown in FIG. 4C, the load receiving platform 1 is stopped at a predetermined step use position, and even if the operator unexpectedly holds the “out” button for a long time, the load receiving table 1 moves to the step use position. It does not protrude beyond the vehicle rear side (S7).

  In addition, when the second operation unit R2 is pulled out to the step use position, the first operation unit R1 cannot be operated as described above. It cannot be returned to the storage position using R1 (S8).

  When the work using the load receiving platform 1 as a step is completed, the operator presses the “ON” button of the second operation unit R2 (S9), whereby the pull-in operation control valve 47 becomes in a communication state and the slide cylinder 24 can be contracted (S10). When the pull-in operation of the load receiving platform 1 is started and the load receiving platform 1 returns to the storage position, the connection with the receiving unit 62 by the switching unit 66 is switched from the OFF state to the ON state. That is, the operation of the cargo receiving stand 1 by the first operation unit R1 becomes possible.

  In this way, the second operation unit R2 is pulled out from the storage position, and is used to operate the movement in the vehicle front-rear direction to an intermediate position that is regulated on the vehicle front side relative to the work position. It functions as an “intermediate position operation unit”.

  In the present embodiment, the control unit 6 is set so that the operation of the first operation unit R1 cannot be performed when the “Exit” button of the second operation unit R2 is pressed. The operation unit 64 does not receive only the operation signal from the “down” button of the first operation unit R1 and the operation unit 64 receives the operation signal from the “up” button even when the “” button is pressed. Also good. That is, even when the cargo receiving platform 1 is slid from the storage position (FIG. 4A) to the step use position (FIGS. 4B and 4C), it is stored using the first operation unit R1. It is good also as a structure which can return the goods receiving stand 1 toward a position. In this case, even if the operator does not move to the position of the second operation unit R2, the load receiving platform 1 can be returned to the storage position, so that the complexity is suppressed.

  As described above, in the present embodiment, the second operation unit R2 is used to restrict the sliding operation toward the rear side of the vehicle and reliably stop it at a predetermined position when using the load receiving platform 1 as a step. Therefore, the protruding amount does not become unnecessarily large. In addition, the load receiving platform 1 can be stopped at a predetermined position by a simple operation by simply pressing the “exit” button. Therefore, the sliding operation of the receiving platform 1 is not performed unnecessarily, and the button operation is not complicated. Further, even if the second operation portion R2 fixed to the vehicle front side slightly from the rear end portion at the lower portion of the cargo box B is used, the cargo cradle 1 is reliably stopped at a predetermined position. The operator is not required to strictly grasp the protrusion amount with respect to the rear end portion, and the worker moves in accordance with the slide operation of the load receiving platform lifting device 100 or stands at a position where the protrusion amount is easily visible. Not subject to restrictions.

  Further, since the load receiving platform 1 is in the step use position, the operator can easily move the load receiving platform 1 by placing his / her legs on the load receiving platform 1. In particular, for an operator who moves from the rear side of the vehicle into the packing box B, the load receiving platform 1 protrudes to the rear side of the vehicle with respect to the packing box B. Since the tilted posture can be taken, safety during movement to the packing box B can be ensured. In addition, since the load receiving platform 1 slides in the horizontal direction (in the direction of arrow A11 in FIG. 1B) from the storage position and the load receiving platform 1 reaches the step use position in the same posture as the storage state, the part where the legs are hung is also in the horizontal state. And the relative height with the packing box B can maintain the same state, and can further ensure the safety of the operator.

  In the case of a load receiving / lifting device 100 stored below the packing box B as in this embodiment, in the case of a load that can be loaded and unloaded between the ground and the packing box B without using the device 100, the rear of the vehicle Since the side is not obstructed, the effect of the simplicity and quickness useful for the operator becomes more remarkable by using the above-described steps.

  Further, in the present embodiment, when a load is placed and the load receiving platform lifting device 100 is used for loading and unloading the load, the structure shown in FIG. 1 is movable. Even if the slider 22 is slid to the rearmost position while maintaining its height from the stowed position and is lowered from the position to the grounding position (second lowered position in FIG. 1 (e)), the second operation unit R2 The above-described effects can be obtained by restricting the movement in the vehicle front-rear direction, particularly the vehicle rear side, when the vehicle is used.

  Furthermore, although the second operation unit R2 is provided separately from the first operation unit, the operation of the movement of the load receiving platform 1 (FIGS. 1 and 4) described above is performed by one operation unit provided in the first operation unit. A possible configuration is also possible. Of course, the mounting position of the second operation portion R2 is not limited to the position shown in FIG.

  INDUSTRIAL APPLICABILITY The present invention is useful for a load receiving table lifting / lowering device that is housed below a cargo box of a vehicle.

DESCRIPTION OF SYMBOLS 100 Cargo stand raising / lowering device 1 Cargo stand 2 Slide drive part 3 Lift drive part 4 Hydraulic drive device 6 Control part B Cargo box C Frame R1 1st operation part (work position operation part)
R2 2nd operation part (way position operation part)
61 Input unit 62 Reception unit 63 Storage unit 64 Calculation unit 65 Output unit 66 Switching unit 71 Position sensor

Claims (7)

A control unit that is mounted on the rear side of the vehicle and is used for loading and unloading luggage, and that has a load receiving base that is stored below the cargo box of the vehicle, and that can be controlled to pull out the stored load receiving base to the rear side of the vehicle. A load receiving table lifting device provided,
The said control part is comprised so that the movement of the said receiving stand can be controlled irrespective of the input of the drawer signal with respect to the said receiving stand. The receiving stand raising / lowering apparatus characterized by the above-mentioned. The control unit is configured to be capable of lowering control for lowering the load receiving table,
Further, the control unit includes a first drawer control for moving the stored cargo receiving platform to a grounded position via the lowering control, and a second drawer control capable of regulating the drawer of the cargo receiving platform. The load receiving table lifting device according to claim 1. A first operation unit for outputting the drawer signal against the first extraction control,
A second operation unit for outputting the drawer signal against said second lead control,
The load receiving table elevating device according to claim 2, comprising: 4. The load receiving platform lifting / lowering device according to claim 3, wherein when the operation signal of the second operation unit is input to the control unit, the operation signal of the first operation unit is disconnected. 5. A detection means provided on the vehicle side, for detecting movement in the vehicle front-rear direction when an operation signal of the second operation unit is input, and outputting a detection signal to the control unit;
The said control part regulates the movement of the said vehicle cradle in the said vehicle front-back direction based on the said detection signal. The load cradle raising / lowering apparatus of Claim 3 characterized by the above-mentioned. By the drawer control that pulls out the stored cargo cradle to the rear side of the vehicle, it is pulled out to the work position that moves up and down between the cargo box and the ground,
The position for restricting the drawer of the cargo cradle is a midway position where the cargo cradle protrudes from the rear end portion of the cargo box to the vehicle rear side and on the vehicle front side from the work position. The load receiving table elevating device according to any one of claims 1 to 5. The load receiving platform is stored in the storage position in a state folded in the vehicle front-rear direction,
The load receiving table elevating device according to any one of claims 1 to 6, wherein the load receiving table lifting and lowering device is pulled out in a substantially same folded state from the storage position to a position where the pulling of the load receiving table can be regulated.