JP5545649B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a load receiving table lifting device having a stopper member for preventing load falling in a load receiving table on which a load is placed.

  Some load receiving table lifting devices used for loading and unloading loads between a loading platform and the ground are provided with a stopper member for preventing the falling of the cart for carrying the loads or the loads to the loading platform. For example, as shown in FIG. 5A, the load receiving platform that is lifted and lowered via the parallel link arm 93 fixed to the vehicle frame is in a horizontal state along the arrow A11 from the height equivalent to the floor surface 91 of the loading platform. Then, the posture is changed to a state where the tip is grounded as indicated by an arrow A12. At this time, as shown in FIG. 5 (b), the stopper member 95 provided on the front end side of the load receiving platform 92 is loaded from the front end side of the load receiving platform 92 when the stopper member 95 is carried out from the floor surface 91 of the load receiving platform 92 to the load receiving platform 92. When the posture is changed to a state in which the tip of the load receiving base 92 is in contact with the ground, the load or the like is supported by the stopper member 95 to prevent the collapse of the load.

These stopper members 95 has a freely standing configured for loading cradle 92. When the load receiving device lifting / lowering device is not used, the stopper member 95 is secured to the load receiving stand 92 in a lying state, and when carrying the load from the floor surface 91 of the load receiving platform to the load receiving stand 92, the restraint is released and Stands up by the biasing member. Further, when the carriage 94 is placed on the load receiving base 92 from the ground, the stopper member 95 is pushed by the casters 94a and the like, and the stopper member 95 is laid down against the urging force.

  In order to prevent the workability related to loading and unloading of the load receiving table from being deteriorated, the switching operation for securing or releasing the stopper member 95 can be easily performed with a lever or the like. A configuration has been proposed in which the effective area of the cargo receiving tray 92 is ensured by providing the same (Patent Document 1).

JP 2006-089017 A

  Although the work efficiency related to loading and unloading of the load is maintained while preventing the fall of the load in this way, it is still in terms of safety because the stopper member is locked and unlocked manually. There is room for improvement. In particular, regarding a vehicle including a cargo receiving platform lifting device, the vehicle is often stopped in front of a narrow street or a house and loaded and unloaded, and the worker is required to perform a quick work. In such a case, the operator may carry out the baggage immediately by performing only the lifting operation of the load receiving table without releasing the securing of the stopper member.

If the operator misrecognizes that the stopper member is standing up despite having forgotten to release the binding, there is a risk of dropping the load from the load receiving platform. Further, even if the load can be placed on the cargo cradle, if the worker keeps the same misrecognition, the posture is changed to a state where the tip of the cargo cradle is grounded (shown in FIG. 5A). In the movement of the arrow A12), since the load or the like is not supported by the stopper member, the load collapse may occur.
An object of the present invention is to provide an elevating device that enables an operator who carries a load from a loading platform to a receiving platform to recognize whether or not a stopper member is erected.

Switching between a load receiving platform that is provided at the rear of the vehicle and moves up and down between the ground and the loading platform, and a lying state that is provided at the front end side of the cargo receiving platform and that falls on the loading platform, or that stands up with respect to the loading platform. The load receiving platform lifting / lowering device is provided with a free stopper member and an informing means for informing at least one of the lying state and the standing state of the stopper member.

  The notification means includes a stopper member detection device that detects either a lying state or an upright state of the stopper member, a baggage detection device that detects carry-out of the baggage from the cargo bed to the cargo tray, and the stopper member detection device. And a sounding device that makes a sound in response to a detection signal of the luggage detection device.

  Alternatively, the notifying means is configured such that a reflecting member that reflects external light or a light emitting member having a light source is arranged on the stopper member, and the notifying means notifies when the stopper member is in the standing state. Furthermore, it is good also as a structure performed by the light reflected from the said reflection member, or the light from the said light emission member.

According to the present invention, when the stopper member provided on the cargo cradle is switched to the standing state, the notification signal from the notification means can be output, so that an operator who carries the cargo in the cargo cradle to the cargo cradle It can be recognized that the stopper member is in the standing state during the operation. Therefore, even if the operator forgets the operation of raising the stopper member before carrying out the baggage, the state of the stopper member can be grasped when carrying out the baggage, so that the baggage is not accidentally dropped from the load receiving table. Furthermore, if it is recognized that the stopper member is not raised, the operator can consciously support the load even when the load receiving table is lowered while the load is loaded on the load receiving table. When changing to a posture where the tip of the bag contacts the ground, the luggage will not collapse unexpectedly.

It is the side view and perspective view of a cargo receiving stand raising / lowering apparatus which concern on 1st Embodiment. It is the principal part perspective view and side view which show the structure of the stopper of the cargo receiving stand which concerns on 1st Embodiment. It is the model side view and operation | movement flowchart which show the arrangement | positioning state of the sensor which concerns on 1st Embodiment. It is a side view which shows the structure of the stopper provided in the goods receiving stand which concerns on 2nd Embodiment. It is a side view of the load receiving table raising / lowering apparatus which concerns on the conventional embodiment.

An embodiment of a cargo receiving platform lifting apparatus according to the present embodiment will be described with reference to the drawings.
(First embodiment)

  As shown in FIG. 1A, the load receiving platform lifting device 100 is mounted on the rear side of the vehicle, the load receiving stand 2 stored in a standing state along the load box 1, and a parallel connected to the load receiving stand 2. A hydraulic control device (not shown) that controls the lifting operation of the cargo receiving platform 2 via the link arm 3 is provided.

  The load receiving platform 2 is stood and stowed (solid line portion 2a) when the vehicle is traveling, and is rotated (arrow A1) when the load receiving platform lifting / lowering device 100 is used, and is in a horizontal state at the height of the floor surface 1a in the load box ( The alternate long and short dash line portion 2b). The load receiving platform 2 is further moved up and down along the arrow A2 to be in a grounded state (two-dot chain line portion 2c), and then the tip of the load receiving table is inclined downward (arrow A3) (one-dot chain line portion 2d). The posture is changed. When ascending, the opposite operations are performed in the order of the arrows A3 and A2, and the load is loaded and unloaded between the loading platform and the ground by such lifting operation.

  As shown in FIG. 1 (b), the load receiving table 2 is provided with a fall prevention member on each of the front end side and the both side sides. The tip-side fall prevention member is a stopper member 21 that can stand up with respect to the load placement surface of the load receiving platform 2 and is provided along the vehicle width direction. The side-side fall prevention members are side guards 22a and 22b having an L-shaped cross section, and are fixed along the vehicle front-rear direction.

  The parallel link arm 3 has a pair of left and right ends and a tip end portion connected to the load receiving platform 2 and a base end portion attached to a support member (not shown) in the lower rear portion of the vehicle. The tilt link 3a, the tension arm 3b, and the compression arm 3c. A link arm 3d and a lift cylinder 3e are provided.

The tilt link 3a extends in the vertical direction, and an upper part thereof is rotatably connected to an upper part of the support bracket 11 via a pin, and a lower part is formed to be swingable in the vehicle front-rear direction. Tension arm 3b is base end rotatably connected to via a pin on the top of the tilt link 3a, the tension arm 3b tip is rotatably connected to the upper end of the receiving platform 2. The tension arm 3b extends in the vehicle front-rear direction, and one end (base end) on the vehicle front side is rotatably connected to the upper end portion side of the tilt link 3a via a pin 30b, and the other end (tip end) on the vehicle rear side is connected. In addition, it is rotatably connected to the load receiving platform 2 via a pin. The compression arm 3c extends in the vehicle front-rear direction below the tension arm 3b, and one end (base end) on the vehicle front side is a pin between the support bracket 11 and the bracket piece 12 facing the support bracket 11 from the outside. The other end (front end) on the rear side of the vehicle is rotatably connected to the lower end portion of the link arm 3d via a pin. The upper end of the link arm 3d is pivotally supported by a pin together with the distal end of the tension arm 3b on the base end side of the load receiving platform 2 so as to be freely rotatable. The distal end of the compression arm 3c is connected to the base end side of the load receiving platform 2 via the link arm 3d. The lift cylinder 3e is a hydraulic cylinder and extends in the vehicle front-rear direction below the compression arm 3c. One end (base end) of the lift cylinder 3e on the vehicle front side is rotatably connected to the lower end of the tilt link 3a via a pin, and the other end (tip end) on the vehicle rear side is connected to a substantially middle portion of the compression arm 3c. It is rotatably connected via a pin.

  As shown in FIG. 1B, the hydraulic control device is covered with a resin case 4 arranged at a position below the cargo box at the rear of the vehicle, and includes an electric motor, a hydraulic pump, a solenoid valve, and the like. The hydraulic oil is supplied to the lift cylinder 3e by appropriately controlling these. By the supply of this hydraulic oil, the above-described lifting operation of the load receiving platform 2 is performed.

  In addition to the stopper member 21 and the side guards 22a and 22b, the load receiving platform lifting device 100 is in a state where the stopper member 21 can be applied upright when an operator actually loads and unloads a load. An informing means that can be aware of this is provided. This notifying means is installed on the inner surface of the packing box on the rear side of the packing box, the photoelectric sensor 5 provided on the side guard 22, the stopper detection sensor 6 disposed in the portion where the stopper portion 21 is stored in a lying position, and The sounding device 7 is driven by receiving outputs from these sensors 5 and 6.

The photoelectric sensor 5 is provided at the ends of the pair of left and right side guards 22 on the rotation base end side (the vehicle front side in the horizontal state) of the load receiving platform 2. This photoelectric sensor 5 is arranged in such a manner that a light projecting part 51 arranged on the left side guard 22a and a light receiving part 52 arranged on the right side guard 22b face each other on the inner side in the vehicle width direction. Being done. The light projecting unit 51 uses a light emitting diode (LED) as a light source, and light indicated by an imaginary line L <b> 1 is output from the light projecting unit 51 toward the light receiving unit 52. When the cargo is carried out from the floor surface 1a of the cargo box to the cargo receiving platform 2 by a cart or the like, the light L1 is blocked by the cart or the baggage, and the light receiving unit 52 detects a change in the amount of light.

The stopper detection sensor 6 is disposed on the surface (loading surface) side of the cargo receiving platform 2 and detects the standing state of the stopper member 21. As for detection by the stopper detection sensor 6, a perspective view of a main part of the load receiving table of FIG. 2A and a side sectional view of FIG. 2B (a sectional view taken along line AA of FIG. 2A). It explains using. In the stopper detection sensor 6, the detection unit 61 disposed on the load receiving table main body 201 that forms the load placing surface of the load receiving stand 2 is opposed to the distal end portion 211 of the stopper member 21 that has fallen on the load placing surface. It is a proximity sensor to detect with. The distal end portion 211 has a shape in which a plate-like stopper member 21 pivotally supported by a pin 21a whose longitudinal direction is the vehicle width direction is refracted. The load receiving base body 201 is connected to a block-shaped member having a hollow portion with the vehicle width direction as a longitudinal direction, and the stopper member 21 opens and closes the hollow portion 201a that is open upward. It is attached to 201 so that rotation is possible. Further, holding (clamping) or releasing the stopper member 21 in a lying state is performed via a lever 23 provided on a side portion of the load receiving table main body 201. As shown in FIG. 2 (a), when the lever 23 is disposed in one notch 24a of the stopper 24, the stopper member 21 is unlocked, and when the lever 23 is disposed in the other notch 24b, the lever 23 is secured. It is configured to bind. Although illustration of the securing means is omitted, the lever 23 is connected to one end of a rod inserted into the side molding 202, a hook connected to the other end of the rod, and a vehicle front rear side end portion of the stopper member 21. The stopper member 21 can be locked or unlocked by engaging or disengaging the engaged portion provided on the stopper. Specifically, the detection unit 61 is arranged on a side wall part that forms the hollow part 201a of the cargo receiving table main body part 201. When the stopper member 21 is in a fallen state, as shown in FIG. It is detected that the detection unit 61 faces the detection member 61 and the stopper member 21 is lying down, and the tip end portion 211 stands up so as to be disengaged from the load placement surface of the load receiving table main body 201.
The photoelectric sensor 5, the stopper detection sensor 6, and the sounding device 7 are connected to the control unit 4a of the hydraulic control device 4 as shown in the schematic diagram of FIG.

The control unit 4a controls the lifting command via a wired or wireless operating device for operating the cargo receiving platform lifting device and outputs it to the hydraulic control device, and turns on the main switch SW in the cab. It is connected to the vehicle battery B via the wiring 21. When the operator turns on the main switch SW, the control unit 4a is driven by power supply. When the control unit 4a is driven, the photoelectric sensor 5, the stopper detection sensor 6, and the sounding device 7 are also driven by power supply. The A load receiving sensor 8 is also connected to the controller 4a. The load receiving sensor 8 is a proximity sensor that detects that the load receiving table has been raised to the highest position (state 2b in FIG. 1 (a)) where the height of the load receiving tray is equivalent to the floor surface 1a of the load box . It is arranged in the vicinity of the pin 30b that serves as the rotating shaft 3b. The load receiving sensor 8 is composed of a detection unit (detection sensor) provided on the vehicle side that is the vicinity of the pin 30b and a detected portion (detection dock) disposed on the tension arm 3b. It functions when the tension arm 3b rotates until it reaches the highest position.
Next, the operation procedure of these sensors 5, 6, 8 and the sounding device 7 will be described with reference to FIG.
After the vehicle stops, the main switch SW is turned on (S1), the hydraulic control device 4 can be driven, and the operator can perform the raising / lowering operation of the load receiving platform 2.

  The operator operates a switch or the like provided on the control device that can be gripped by the operator to raise the load receiving platform 2 to the highest position, and the operator prepares to carry the load in the cargo box 1 to the load receiving platform 2. At this time, it is detected by the load receiving sensor 8 that the load receiving stand 2 has reached the highest position (S2).

  Next, in the operation of carrying the load to the load receiving table 2 using the cart, the light L1 output from the light projecting unit 51 of the photoelectric sensor 5 is blocked by moving the cart from the cargo box 1 to the load receiving table 2. The photoelectric sensor 5 detects the unloading of the package (S3). At this time, if the stopper member 21 of the load receiving platform 2 is raised (S4), the sounding device 7 is set not to be driven (S5). On the contrary, in a state where the stopper member 21 is not standing (a state where the stopper detection sensor 6 is detecting) (S4), the sounding device 7 is set to be driven (S6). That is, when all the detection signals of the cargo receiving sensor 8, the photoelectric sensor 5, and the stopper detection sensor 6 are input to the control unit 4a, the sounding device 7 is driven.

  The operator can recognize that the stopper member 21 does not stand up even when the operator is carrying out the load, depending on the presence or absence of sound generated by driving the sounding device 7, and the worker can carry out the load with peace of mind. It can be performed. In particular, since the stopper member 21 does not stand up unless the operator directly operates the lever 23, forgetting the operation of the lever 23 due to carelessness due to accustomed loading and unloading work when quick loading is required. May end up. At this time, even if the stopper member 21 is not standing, even if the operator misrecognizes that the stopper member 21 is standing, a sound is generated when carrying the baggage, and the misrecognition may be noticed. it can. Further, if it is recognized that the stopper member 21 is not standing, the operator may perform the same erroneous recognition when the posture is changed so that the tip of the load receiving platform 2 contacts the ground (arrow A3 in FIG. 1A). Compared to the case of holding, care can be taken not to collapse the load, which is preferable in terms of safety.

In this way, information related to the standing of the stopper member 21 is transmitted from the cargo cradle 2 toward the front of the vehicle, and such information is transmitted to an operator who is working on the floor surface 1a of the cargo box. Therefore, it is possible to prevent a decrease in safety caused by getting used to loading and unloading work and seeking quick work. In particular, by using the notification unit according to the present embodiment, an operation related to the operation of the notification unit is unnecessary, and the work process does not increase.
(Second Embodiment)

  In the present embodiment, the point that the information regarding whether or not the stopper member 210 is standing from the cargo cradle 2 toward the front of the vehicle is output in the same manner, and a different configuration of the notification means for performing the output is described with reference to FIG. The description will focus on the different parts.

FIG. 4 is a perspective view showing a state in which the cargo is carried out from the cargo box to the cargo cradle 2. For convenience of explanation, illustration of a side wall of the cargo box and the like is omitted. The plurality of loads 91, 92, 93 are carried to the load receiving platform 2 while being loaded on the carriage 9, and the caster 9 a on the vehicle rear side is supported by the standing stopper member 210 so as not to fall from the vehicle rear. The stopper member 210 is configured such that the tip end portion 211 of the stopper member 210 that is turned upright is refracted, and the caster 9a is supported by the refracted portion. A reflective tape 210a made of, for example, vinyl chloride is affixed to a surface (hereinafter simply referred to as “front surface”) on the front side of the tip 211. The stopper member 210 is provided in almost the full width of the load receiving platform 2 along the vehicle width direction, and the reflective tape 210 a is stuck on the full width region of the tip end portion 211 of the stopper member 210.

By attaching the reflective tape 210a, when the load receiving platform 2 is in a horizontal state at almost the same height position as the floor surface 1a of the packing box as shown in the drawing, the lighting and the packing box installed in the packing box Light from the external environment, for example, sunlight, indoor light in the packing box, or street light, is reflected in the direction of the worker who is working in the packing box (front side of the vehicle). The worker who is working in the cargo box can recognize that the stopper member 210 is in the standing state by the reflected light. In other words, the reflective tape 210a in a state where the stopper member 210 is erected notifies the worker who is working. In particular, when the stopper member 210 is in a standing state, the tip end portion 211 is inclined with respect to the vertical direction, so that sunlight, room light, and the like are easily reflected upward from the load receiving platform 2 to the front side of the vehicle by the reflective tape 210a. The reflected light enters the worker's field of view. On the other hand, since the tip end portion 211 of the stopper member 210 is accommodated in the hollow portion 201a of the cargo receiving table main body 201 when the stopper member 210 is laid down, the light is not reflected to the front side of the vehicle. Therefore, the operator can easily determine whether the stopper member 210 is in the standing state or the lying state depending on the presence or absence of the reflected light, and there is no reflected light even if the forgetting to raise the stopper member 210 is forgotten. Thus, it can be recognized that the stopper member 210 is not raised during the operation. In this embodiment, an operation for recognizing the state of the stopper member 210 is not necessary, and the number of work steps is not increased.

In addition, since the reflective tape 210a is affixed over almost the entire width of the load receiving platform 2, even when the load 91, 92, 93 loaded as shown in the figure is supported by the stopper member 210, the reflective tape 210a extends further to the side. The reflected tape 210a reflects the light toward the front side of the vehicle. Therefore, not only when carrying a load while using a cart to carry it to the load receiving platform 2, but also when an empty cart is placed on the load receiving platform or when loading a load onto the cart, The standing state or the lying state of the member 210 can be recognized. In addition, the reflective tape 210a may not be applied to the entire width, or may be applied at regular intervals, and is partially applied to a position where it is easily reflected in consideration of the installation position such as lighting in the packing box. It is also possible to have a configuration. Furthermore, although the reflective tape 210a is affixed only to the front end portion 211 that is in contact with and supported by the caster 9a, the stopper member 210 is raised even at the portion forming the hollow portion 201a of the cargo receiving table main body portion 201. If it is in a state that can be visually recognized by the operator, a configuration may be adopted in which the hollow portion 201a is formed, for example, the back surface portion 210b of the stopper member 210 or the bottom surface portion 210c of the hollow portion 201a. In this case, there is no possible since the rear surface portion 210b and the bottom portion 210c is not in contact with casters 9a of the portion fraction 2 10b, reflective tape 210a affixed to 210c are peeled off or worn. Moreover, as long as it reflects external light, it may not be the reflective tape 210a but may be a fluorescent paint.

Moreover, in this embodiment, although it was set as the structure by which the reflective tape 210a was stuck to the front-end | tip part 211, the structure which arranged what has a light source and self-light-emission, for example, the structure by which the LED lamp etc. were arranged, and luminous material It is possible to adopt a configuration in which a member having paint or a paint is provided. In this case, if the stopper member 210 is in the standing state even at night, light is sent to the worker who is working on the loading platform or the receiving platform, so that the worker can recognize whether or not the stopper member 210 is in the standing state. . Furthermore, the configuration is such that the color of the tip portion 211, the back surface portion 210b and the bottom surface portion 210c to which the above-described reflective tape 210a is applied is different from the color of the cargo cradle 2 so that the worker who is working can easily see. It doesn't matter.

  The present invention is useful not only for a rotary type load receiving table lifting device but also for other forms as long as it is a load receiving table lifting device used for carrying out a load.

DESCRIPTION OF SYMBOLS 1 Cargo box 2 Cargo cradle 3 Parallel link arm 4 Control apparatus 5 Photoelectric sensor 6 Stopper detection sensor 7 Sounding device 8 Cargo cradle sensor 9 Carriage 1a Floor surface (cargo box)
21 Stopper member 201 Receiving base body 210a Reflective tape

Claims (3)

A load receiving platform that is provided at the rear of the vehicle and moves up and down between the ground and the loading platform, and is switched to a lying state that is provided at the front end side of the cargo receiving platform and falls down on the loading platform or stands up with respect to the loading platform. A stopper member which is flexible and functions when carrying a load from the loading platform of the vehicle to the loading platform; and a reporting means for notifying the front side of the vehicle at least one of the lying down state and the standing state of the stopper member And a receiving platform lifting device. The notification means includes a stopper member detection device that detects either a lying state or an upright state of the stopper member, a baggage detection device that detects carry-out of the baggage from the cargo bed to the cargo tray, and the stopper member detection device. And a sounding device that makes a sound in response to a detection signal of the load detection device. The cargo receiving platform lifting / lowering device according to claim 1, wherein the notifying unit is configured such that a reflecting member that reflects external light or a fluorescent paint is disposed on a portion exposed by the standing of the stopper member. .

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