JPS646057B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a safety device for a vehicle cargo platform elevating device, and more specifically, to a cargo platform for loading and unloading cargo into a cargo storage having double doors. It relates to a device for lifting and lowering. This is used in the field of elevating cargo handling equipment for van-type vehicles and the like.

[Prior art]

Van-type vehicles are equipped with a luggage storage, and the rear side is equipped with double doors that can be opened and closed manually. At the rear of such a luggage storage, a loading platform for loading and unloading luggage is provided, and the loading platform is raised and lowered using hydraulic or electric power. To do this, first open the hinged door sufficiently so that the rising loading platform does not touch the lower edge of the hinged door. Loading can be done by placing the luggage or wagon loaded with luggage on the loading platform, raising the loading platform to the same height as the floor of the luggage storage area, and pushing the luggage toward the front. .

Various types of loading platform elevating devices have been used in the past; for example, the
There are those described in Japanese Patent Publication No.-21286 and Japanese Patent Publication No. 54-42128. The former has a fluid pressure cylinder built into the upper edge beam at the rear of the cargo storage compartment, and uses a moving wire to raise and lower the cargo receiving platform, while the latter uses a parallelogram link mechanism attached to the cargo receiving platform. It is raised and lowered by a fluid pressure cylinder. In either case, it is possible to significantly reduce the labor of workers during cargo handling work, prevent the loading platform from falling in the horizontal direction, and reduce bulk while driving by leaning the loading platform against a closed hinged door. Various improvements have been made to each of them.

By the way, cargo handling work in a vehicle equipped with the above-mentioned loading platform elevating device cannot be carried out unless the hinged door is opened to a predetermined degree or more, since the floor of the luggage storage is located above the lower edge of the hinged door. I can't. For example, when the vehicle is on a slope and cargo handling work is being carried out, if the swing door moves in the closing direction and reaches a predetermined opening degree or more, the loading platform carrying the cargo will rise and collide with the lower edge of the swing door. As a result, there are problems such as packages falling from the loading platform and damage to the loading platform and the hinged door, and a solution to these problems is desired.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and its purpose is to automatically raise the loading platform when the opening of the door is less than a predetermined opening degree in a vehicle equipped with a luggage storage having a double door. To provide a safety device for a vehicular loading platform elevating device capable of preventing a loading platform from colliding with a hinged door and ensuring safety and smoothness of cargo handling work.

[Structure of the invention]

The features of the safety device of the loading platform lifting device of the present invention are as follows:
To explain with reference to FIG. 1, this is a loading platform elevating device that raises and lowers a loading platform in the vicinity of a double-door type hinged door provided at the rear of a luggage storage. A door opening detection means 31 is provided, and switches 12A and 12B which are turned on and off by the door opening detection means are interposed in the drive circuit 13 of the loading platform lifting/lowering device.

[Effect]

When the opening degree of the hinged door 3 is opened beyond a predetermined value, the drive circuit 1 of the cargo platform lifting device 30 is activated by the door opening detection means 31.
The switches 12A and 12B provided at the switch 3 are connected. When the lift switch 32 is turned on, its circuit becomes conductive, and the drive source 34 of the loading platform lifting device is activated. Correspondingly, the cargo receiving platform 7 rises, and when the cargo receiving platform reaches the same height as the floor surface 2a of the cargo receiving storage 2, the cargo and the like placed on the receiving platform can be pushed into the storage. On the other hand, when the hinged door 3 is not fully opened or when the open door starts to close, the open door detection means 31 does not detect the opening of the door, and the switches 12A and 12B of the drive circuit 13 maintain the cut-off state. , if it is in the connected state, it will be in the cut-off state. Therefore, even if the lift switch 32 is turned on to raise the loading platform 7, the drive circuit 1 is not electrically connected, and the drive source 34 does not operate, or if it was operating, it stops, and the lifting of the loading platform is inhibited. be done. As a result, the cargo receiving platform 7 is prevented from colliding with the hinged door 3, and safety of work and cargo is ensured.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples thereof.

As shown in FIG. 2, a double door 3 is attached to the rear of the luggage storage 2 of the van-type vehicle 1 so as to be rotatable around a hinge 4, and the lower edge 3a of the door 3 is attached to the rear of the luggage storage 2. It is located below the floor surface 2a of the warehouse 2, and when the hinged door 3 is closed, it is possible to prevent the cargo from falling or jumping out, and to maintain a completely closed state. This hinged door 3
Guides 5 for guiding the movement of lifting runners 8 of a loading platform lifting device 30 (to be described later) are erected at positions close to the hinges 4 of the vehicle. There is. As shown in FIG. 3, the guide 5 is formed into a hollow shape with a rectangular cross section, for example, and a long groove 6 extending in the vertical direction is formed on one side of the hinged door. The loading platform 7 of the loading platform lifting device 30 has a runner bracket 8a.
It is rotatably attached to the runner 8 via a hinge 9 provided in the runner 8, and can be manually laid down horizontally for cargo handling work, and can be propped up vertically after work.

Although not shown in detail, the runner 8 for raising and lowering the loading platform 7 is connected at its lower end to the piston rod of the hydraulic cylinder 15 shown in FIG. 1, and the main body has two pairs of wheels 26 (see FIG. 2). is installed. These wheels come into contact with both inner walls 5a of the guide 5 described above, and a part of the main body of the runner 8 is fitted into the long groove 6 described above, so that the runner 8 smoothly moves up and down inside the guide 5 when the loading platform 7 goes up and down. I'm starting to be able to do it.

On the other hand, each hinge 4 of the above-mentioned swing door 3 has one
The book pin body 10 is inserted, and the left and right pin bodies 1
0 is attached with door opening detection means 31 shown in FIG. This door opening detection means includes, for example, cam bodies 11A and 11B fixed to a pin body 10 that rotates together with the hinged door 3, and cam followers 27A and 27B that abut and interlock with the cam bodies 11A and 11B. The cam body 11 rotates as the hinged door 3 is opened and closed, and the left and right limit switches 12A and 12B are activated by the expansion and contraction of the cam followers 27A and 27B that contact the lower part 11a and the higher part 11b. ing. These switches are interposed in the drive circuit 13 of the electric motor 34 in the loading platform lifting device 30, and are connected in series with the lifting switch 32 which commands the operation of the loading platform lifting device. Therefore, the above-mentioned hydraulic cylinder 1 is rotated by the rotation of the electric motor 34 which is driven by receiving electric power from the power source 33.
A hydraulic pump 14 that supplies hydraulic oil to the pump 5 is rotated. The hydraulic circuit 29 includes a relief valve 16 that regulates the discharge pressure from the hydraulic pump 14, and a cargo receiving platform 3.
An operating valve 19 is interposed to distinguish between raising and lowering. The operating valves include a rising port 17 having a check valve 17a and a descending port 18 having a throttle 18a, and one can be selected by pushing or pulling the operating lever 28. Note that, in place of such a hydraulic drive circuit, an electric circuit for operating a reversible electric motor may be used to achieve the same function. Further, the door opening detection means 31 is not limited to the cam body 11 or the cam follower 27, and may be a known detection device using a proximity switch or other types of switches. In short, it is sufficient if the drive circuit can be interrupted or connected depending on whether the opening degree of the hinged door 3 is greater than or equal to a predetermined degree. Incidentally, if the lift switch 32 is configured so that it can be turned on and off in conjunction with the switching operation of the operating lever 28 of the operating valve 19, as shown by the two-dot chain line in FIG.
There is an advantage that the operator can issue a predetermined raising/lowering command by simply operating the operating lever 28 in one operation.

According to the safety device of this example, safe cargo handling work in the loading platform lifting/lowering device can be ensured in the following manner. Referring to FIGS. 2 and 3, when loading and unloading luggage into the luggage storage 2, first, as shown by the two-dot chain line, the loading platform 7 leaning against the back of the hinged door 3 is Remove it and manually rotate it around the hinge 9 to bring it into a horizontal position as shown by the solid line. Operator operates valve 19
[See FIG. 1] is put into the lowering port 18, the hydraulic oil in the hydraulic cylinder 15, which shrinks due to the weight of the loading platform 7, is discharged into the oil tank 20 via the throttle 18a, and the loading platform 7 is lowered. During this time, there is no need to drive the hydraulic pump 14, so the loading platform 7 can be lowered regardless of whether the hinged door 3 is opened or closed. When the loading platform 7 is lowered toward the position shown by the dashed line, the hinge 4 of the luggage storage 2 is opened.
It can be opened in the directions of arrows 21 and 22, respectively, with . The cam body 11 shown in FIG. 1 fixed to the pin body 10 of the left and right hinges 4 is similarly rotated in the direction of the arrow 23, and when its opening becomes sufficiently large,
The cam followers 27A, 27B which were in contact with the bottom part 11a of the cam body 11 come into contact with the high part 11b. Thereby two limit switches 12A, 12
B is turned on, and the drive circuit 13 becomes conductive. Place the luggage on the loading platform 7 and turn the lift switch 3
2, the electric motor 34 receives electric power and is driven, and when the operating valve 19 is switched to the rising port 17,
Hydraulic oil from the hydraulic pump 14 is supplied to the hydraulic cylinder 15
is supplied to Since the piston rod is extended, the runner 8 is lifted and the cargo receiving platform 7 is raised. If the cargo receiving platform 7 is stopped when the cargo reaches the floor 2a of the cargo storage 2 and the cargo is moved into the cargo storage 2, it can be easily loaded. When unloading the cargo, switch the operation valve 19 as described above,
If the hydraulic oil in the hydraulic cylinder 15 is discharged through the throttle 18a, the loading platform 7 can be gradually lowered.

If the hinged door 3 is not opened sufficiently during such cargo handling work, the cam body 11 of the open door detection means 31
The amount of rotation is insufficient. The limit switches 12A, 12B are no longer electrically connected by the cam follower 27, etc., and the drive circuit 13 is not electrically connected even if the lift switch 32 is turned on. Therefore, hydraulic pump 1
4 does not rotate, and the loading platform 7 also does not rise.

Note that the same function can be obtained when a reversible electric motor is used in place of the hydraulic cylinder and the loading platform is raised and lowered via wires or gears. Also,
The present invention can be applied to the loading platform elevating device not only when the loading platform is directly raised and lowered by a hydraulic cylinder, but also when using a wire hung on a pulley or using a parallelogram link mechanism.

〔Effect of the invention〕

As can be seen from the description of the embodiments above, the present invention has the following features:
The drive circuit includes an open door detection means that detects when the double door is opened more than a predetermined value, and a switch that is turned on and off by the door opening detection means, so when the door is not opened enough, the switch is cut off. Even if you accidentally turn on the lift switch, the loading platform will not rise. As a result, a situation where the loading platform collides with the hinged door does not occur, and damage to various devices, metal fittings, and loading loading platforms is prevented, making cargo handling operations safer and smoother.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a loading platform lifting device including the safety device of the present invention, Figure 2 is a diagram showing how the luggage storage and loading platform lifting device are installed in the rear of the vehicle body, and Figure 3 is the - line in Figure 2. It is an arrow sectional view. 2...Luggage storage, 3...Holding door, 12A, 1
2B...Switch, 13...Drive circuit, 30...
Loading platform elevating device, 31... Door opening detection means.

Claims (1)

[Scope of Claims] 1. In a loading platform elevating device that raises and lowers a loading platform in the vicinity of a double-sided hinged door provided at the rear of a luggage storage, the opening door detects that the hinged door is opened beyond a predetermined opening degree. 1. A safety device for a loading platform lifting device for a vehicle, characterized in that a detection means is provided, and a switch that is turned on and off by the door opening detection device is interposed in a drive circuit of the loading platform lifting device.