JP2001233114A - Unloading device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unloading device for a vehicle capable of automatically tilting at a gate grounding position without damaging a lower surface of the gate and the ground. SOLUTION: This device comprises a supporting member 10 secured to a rear end of a main frame, a tilting link 2 connected to the supporting member at an upper end so as to be swingable in the front and rear direction of the vehicular body, a lifting arm 3 turnably connected to the upper end of the tilting link at a front end through a pin 31, a gate 6 turnably connected to a rear end of the lifting arm through a pin 32, a tilting cylinder 4 placed below the lifting arm and turnably connected to the supporting member and the gate through respective pins 41, 42, and a lifting cylinder 5 turnably connected to a lower end of the tilting link and an approximately center part rear end side of the lifting arm through respective pins 51, 52. The gate is made to tilt downward around the pin in the rear end of the lifting arm by automatic swing of the tilting link to the backward of the vehicular body at the gate grounding position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unloading apparatus having a gate provided on a side or rear portion of a carrier of a vehicle such as a van type truck, and more particularly, to a countermeasure for enabling the gate to rotate smoothly. Related to

[0002]

2. Description of the Related Art Conventionally, as an unloading device for a vehicle,
For example, as disclosed in Utility Model Registration No. 2070303, a lift arm having a base end rotatably connected to a vehicle body frame via a pin, and a lift arm rotatably connected to a distal end of the lift arm via a pin. A connected gate, a lift cylinder rotatably connected via pins to the vehicle body frame and the tip end of the lift arm, and a lift cylinder disposed below the lift cylinder and connected to the vehicle body frame and the gate, respectively. 2. Description of the Related Art A device having a tilt cylinder rotatably connected via a pin is known. The gate tilts so that it can be converted between a horizontal state and an upright state by the expansion and contraction movement of the tilt cylinder at an arbitrary midway position, and the expansion and contraction movement of the lift cylinder causes the lift arm to rotate around its base end pin axis. It is configured to be turned up and down between the loading platform and the ground.

[0003]

However, in the above-described conventional unloading device, the tilt cylinder is provided to convert the gate between a horizontal state and an upright state. At the grounding position where the ground touches the ground, the tip of the gate cannot be turned downward so as to automatically touch the ground.

In this case, the tip end of the tilt cylinder can be rotated downward by manually contracting and moving the tilt cylinder so that the tip of the gate is in contact with the ground at the contact position. Since the gate pivots around the pin axis at the tip of the lift arm above the pin, when the tip of the gate is pivoted downward at the ground contact position, the lower surface of the gate rubs the ground,
Both the underside of the gate and the ground will be scratched.

The present invention has been made in view of the foregoing, and an object of the present invention is to enable an automatic rotation operation at a gate contact position without damaging both the lower surface of the gate and the ground. An object of the present invention is to provide an unloading device for a vehicle.

[0006]

Means for Solving the Problems In order to achieve the above object, a solution taken by the invention according to claim 1 is as an unloading device for a vehicle, comprising: a support member fixed to a vehicle body frame; A tilt link that is swingably connected to the support member in a contacting / separating direction, a lift arm having a base end rotatably connected to a base end of the tilt link via a pin, and a distal end of the lift arm A tilt cylinder, which is rotatably connected to the support member via a pin, a tilt cylinder disposed below the lift arm, and rotatably connected to the support member and the gate via a pin, respectively, and the tilt link; And a lift cylinder rotatably connected via pins to a tip end of the lift arm and a substantially central portion of the lift arm. The gate is configured to be pivoted downward around the pin axis at the tip of the lift arm by automatically swinging the tilt link in a direction away from the support member when the gate is in contact with the ground. Things.

According to the first aspect, when the gate descends to a contact position where the gate contacts the ground, the tilt link automatically swings in a direction away from the support member due to the weight of the gate and the like. The lift arm similarly moves in the separating direction, and the gate rotates about the pin axis at the tip of the tilt cylinder below the pin at the tip of the lift arm. This makes it possible to automatically turn the tip of the gate downward at the touchdown position, and to smoothly load and unload the load at the touchdown position.

In addition, the gate pivots around the pin axis at the tip of the tilt cylinder, which is below the pin at the tip of the lift arm, so that the lower surface of the gate does not rub against the ground due to the pivot at the gate contact position. The lower surface of the gate and the ground can be reliably prevented from being damaged.

Here, the gate is rotated up and down around the pin axis at the tip of the lift arm by extending and retracting the tilt cylinder at the highest position and in the middle of the up and down movement. In this case, when loading / unloading cargo between the deck surface of the loading platform on the vehicle body frame and a railway platform of a different height, for example, the gate should be placed on the platform corresponding to the highest position or the halfway position. When the tilt cylinder is contracted and moved in the positioned state, the tip of the gate rotates downward. As a result, it is possible to smoothly load and unload the luggage at a position different in height from the deck surface of the luggage carrier.

Further, in the case where the gate is rotated upward about the pin axis at the tip of the lift arm by raising the tilt cylinder at the highest position, the gate is raised. In addition, it is possible to easily raise and lower the gate at the highest position by extending the tilt cylinder, and to move the gate to the storage position during traveling by raising the gate.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show a schematic configuration of an unloading device used for a van type truck as a vehicle.

In FIG. 1, an unloading device X includes a pair of left and right main frames 1 as a body frame of a van type truck 1.
They are attached to the rear portions of a pair of left and right subframes (not shown) provided on the upper surfaces of the subframes 2 and 12 via a support member 10. The unloading apparatus X includes a pair of left and right tilt links 2 and 2, lift arms 3 and 3, tilt cylinders 4 and 4, lift cylinders 5 and 5, and a gate 6.

As shown in FIGS. 2 to 4, the support member 10 includes a frame member 11 having a closed cross section extending below the rear end of each main frame 12 in the vehicle width direction.
A pair of left and right fixed brackets 13, 13 for fixing 1 to the rear end of each main frame 12 and sub-frame
(Two appearing in FIG. 1) and supporting brackets 14 and 14 (2 in FIG.
Appear). Each of the support brackets 14
Are opposed pieces 14a, 14a facing each other in the vehicle width direction.
(Two appear in FIG. 1). As shown in FIG. 4 and FIG.
5 is mounted.

As shown in FIGS. 2 and 3, each of the tilt links 2 is formed in a substantially U-shaped cross section that opens to the rear of the vehicle body and extends in the vertical direction. Are rotatably connected to the upper portion between the opposing pieces 14a, 14a via pins 21 so that the lower end side (tip side) swings in the direction of contacting and separating with the support member 12, that is, in the longitudinal direction of the vehicle body. In this case, the lower end of each tilt link 2 has the opposite piece 14 of the support bracket 14.
a, 14a are stored in a contact state (FIGS.
The position shown in FIG. 5) and the disengagement position (the position shown in FIG. 2) that disengages from the inside of the opposing pieces 14a, 14a toward the rear of the vehicle body.

Each of the lift arms 3 extends in the front-rear direction of the vehicle body, and its front end (base end) is rotatably connected to the upper end of the tilt link 2 via a pin 31. The rear end (tip) of each of the lift arms 3 is rotatably connected to the upper end of the gate 6 at both left and right positions via pins 32, respectively.

Each of the tilt cylinders 4 is composed of a hydraulic cylinder, and extends below the lift arm 3 in the longitudinal direction of the vehicle. The front end of each of the tilt cylinders 4 is opposed to an opposing piece 14a outside the support bracket 14.
And a bracket piece 16 which is opposed to the facing piece 14a from the outside, and is rotatably connected via a pin 41. On the other hand, the rear end of each tilt cylinder 4 is rotatably connected via a pin 42 to the left and right ends of the lower end of the gate 6. In this case, each tilt cylinder 4
It is laid out below the lift arm 3 diagonally outward.

Each of the lift cylinders 5 is composed of a hydraulic cylinder and extends below the lift arm 3 in the longitudinal direction of the vehicle. The front end of each of the lift cylinders 5 is rotatably connected to the lower end of the tilt link 2 via a pin 51. The rear end of each of the lift cylinders 5 is rotatably connected to a distal end side of a substantially intermediate portion of the lift arm 3 via a pin 52. The gate 6 is positioned at the highest position (the position shown in FIG. 4) by moving each lift cylinder 5 upward to be substantially flush with the loading platform 15 by extending each lift cylinder 5, while moving each lift cylinder 5 by contraction movement. By doing so, it is positioned at the ground contact position (the position shown in FIG. 3) where it descends and touches the ground G.

The gate 6 has a substantially triangular cross-section when viewed from the side of the vehicle body, and the ascending and descending operation state (the state shown in FIGS. 3 and 4) in which the mounting surface 61 (upper surface) is horizontal. The rear end (tip) is mutually converted into a downward tilt state (the state shown in FIG. 2) in which the rear end (front end) contacts the ground G. The gate 6 is raised by the continuous ON operation of a raising switch (not shown) so as to cover the rear surface of the bed 15 from the rear from the lying state where the mounting surface 61 is horizontal at the highest position. Upright state (Fig. 5
(The state shown in the figure). On the other hand, the gate 6 can be changed from a standing state to a falling state at the highest position by a continuous ON operation of a falling switch (not shown).

Next, the tilting operation and the undulating operation accompanying the lifting / lowering operation of the gate 6 by the unloading device X will be described with reference to FIGS. In this case, it is assumed that the gate 6 is located at the highest position (the position shown in FIG. 4).

First, when the lowering switch (not shown) is turned on to lower the gate 6, the pressure oil in the opposite rod side chamber (not shown) of each lift cylinder 5 is acted upon by the action of a load such as the own weight of the gate 6. The lift cylinders 5 are gradually discharged and each of the lift cylinders 5 starts to contract and move, and the lift cylinders 5 and the lifts around the pins 51 at the front ends of the lift cylinders 5, the pins 31 at the front ends of the lift arms 3 and the pins 41 at the front ends of the tilt cylinders 4. The arm 3 and each tilt cylinder 4 are respectively turned downward. Thus, the gate 6 is lowered by rotating around the pins 52 at the rear ends of the lift cylinders 5 and the pins 32 at the rear ends of the lift arms 3 while being held in a horizontal state. At this time, since the gate load is applied to each of the lift cylinders 5 while the gate 6 is being lifted and lowered, the tilt link 2 exerts a force toward the disengagement position (the position shown in FIG. 2) behind the vehicle body. It is not acting and is held in the storage position (the position shown in FIG. 3).

Thereafter, when the gate 6 is positioned at a ground contact position (the position shown in FIG. 3) where the gate 6 contacts the ground G, each of the tilt links 2 swings backward to the disengagement position (the position shown in FIG. 2), With the pin 42 at the rear end of each tilt cylinder 4 as a fulcrum, the rear end of the gate 6 (mounting surface 61) is tilted downward and automatically converted to a tilt state (the state shown in FIG. 2). In this case, the conversion of the gate 6 into the tilted state is performed by applying a downward load to the rear end of the gate 6 when the front end of the lower surface of the gate 6 descending while maintaining the horizontal state first contacts the ground G. Done. That is, each lift cylinder 5 is moved to the gate
The pin 32 at the rear end of each lift arm 3 is moved to the rear of the vehicle body while being further contracted from
Is converted into a tilt state, whereby the rear end of the gate 6 tilts downward with the pin 42 at the rear end of the tilt cylinder 4 as a fulcrum.

As described above, when the gate 6 descends to the contact position where the gate 6 contacts the ground G, each tilt link 2 automatically swings rearward of the vehicle body to the disengagement position due to the rotational moment of the pin 42 of the gate 6 or the like. The pin 32 at the rear end of the lift arm 3 also moves to the rear of the vehicle body with the swing of each tilt link 2, and the pin 4 at the rear end of the tilt cylinder 4 is moved.
The rear end of the gate 6 can be automatically tilted downward with the fulcrum 2 as a fulcrum, so that loading and unloading of cargo can be performed smoothly.

In addition, when the gate 6 rotates around the pin 42 at the rear end of each tilt cylinder 4 below the pin 32 at the rear end of each lift arm 3 at the ground position of the gate 6, the gate 6 rotates. Due to the tilt, the lower surface of the gate 6 does not rub the ground G, and the lower surface of the gate 6 and the ground G can be reliably prevented from being damaged.

On the other hand, when raising the gate 6 in the tilted state from the ground position, a lift switch (not shown) is turned on.
When operated, pressurized oil is supplied to the opposite rod side chamber of each lift cylinder 5 and each lift cylinder 5 starts extending and the rear end of the gate 6 tilts upward with the pin 42 at the rear end of the tilt cylinder 4 as a fulcrum. Then, by being converted to the horizontal state, the gate 6 is positioned at the grounding position (a state where only the lower front end of the gate 6 is in contact with the ground G).

Each of the lift cylinders 5 is continuously extended to move the lift cylinder 5 around the pin 51 at the front end, the pin 31 at the front end of each lift arm 3 and the pin 41 at the front end of each tilt cylinder 4 so that each lift cylinder 5 is lifted. The cylinder 5, the lift arms 3 and the tilt cylinders 4 are respectively rotated upward. Thus, the gate 6
While being held in a horizontal state, the lift cylinder 5 is raised by the rotation of the pins 52 at the rear end of the lift cylinders 5 and the pins 32 at the rear end of the lift arms 3, and is positioned at the highest position where it is substantially flush with the carrier 15.

When the gate 6 is erected at the highest position, if the erection switch is continuously turned ON, pressure oil is supplied to the opposite rod side chamber (not shown) of each tilt cylinder 4 to cause the oil to be supplied. The tilt cylinder 4 starts to extend and the rear end of the gate 6 rotates upward with the pin 32 at the rear end of the lift arm 3 as a fulcrum, and moves the gate 6 from the elevating operation state to the upright state (the state shown in FIG. 5). Convert. in this way,
The gate 6 is raised and raised around the pin 32 at the rear end of the lift arm 3 by extending each tilt cylinder 4 at the highest position, thereby raising and lowering the gate 6 at the highest position. It can be easily performed by the extension movement of each tilt cylinder 4 and can be used as a door that covers the rear surface of the loading platform 15 of the van type truck 1 from the rear by raising the gate 6.

At this time, when the upright switch is intermittently turned ON at the highest position, the gate 6 can be intermittently tilted upward to a desired angle up to the upright state. Can be poured into the loading platform 15 and loaded.

Further, when loading and unloading cargo between the deck surface of the loading platform 15 and a railway platform or the like having a different height, the height at which the front end of the lower surface of the gate 6 touches the platform, for example, the highest elevation The distal end of the gate 6 is tilted downward by contracting and moving each tilt cylinder 4 in the position or the position in the middle of ascending and descending. Thereby, the tip of the gate 6 can be tilted at the highest position or at the middle position, and the loading and unloading of the cargo at a position different from the deck surface of the loading platform 15 (the highest position or the middle position) can be performed smoothly. Can be done.

In this embodiment, the case where the unloading device X is provided at the rear end of the main frame 12 of the van type truck 1 has been described. However, the unloading device X is provided on the body frame of a vehicle such as a van type truck. It is needless to say that the present invention can be applied to a case where it is provided on at least one of the left side and the right side. In this case, the gate can be used as a side door of the cargo bed.

[0031]

As described above, according to the first aspect of the present invention, the tilt link is automatically swung in the direction away from the support member when it comes into contact with the ground. By rotating the gate downward around the pin axis at the tip of the lift arm, the tip of the gate can be automatically rotated downward at the touchdown position, and the loading and unloading of the load can be smoothly performed at the touchdown position. It can be carried out. Moreover, by rotating the gate about the pin axis at the tip of the tilt cylinder below the pin at the tip of the lift arm, it is possible to reliably prevent the lower surface of the gate and the ground from being damaged.

According to the vehicle unloading device of the second aspect of the present invention, the tilt cylinder is extended and retracted at the highest position and the position in the middle of ascending and descending to rotate the gate up and down, so that the deck surface of the loading platform is When loading and unloading cargo between railway platforms with different heights, the tilt cylinder can be contracted and the tip of the gate can be rotated downward while the gate is positioned on the platform. The loading and unloading of luggage can be performed smoothly at different heights from the deck surface.

Further, according to the third aspect of the present invention, the tilt cylinder is extended at the highest position to raise the gate to raise and lower the gate at the highest position. It can be easily carried out by extension movement of the cylinder, and can be used as a door of a van type truck bed by raising the gate.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic configuration of an unloading device according to an embodiment of the present invention.

FIG. 2 is a side view showing a schematic configuration of an unloading device in which a gate is tilted at a ground position.

FIG. 3 is a side view showing a schematic configuration of an unloading device in which a gate is set in an elevating operation state at a ground position.

FIG. 4 is a side view showing a schematic configuration of an unloading device in which a gate is in a laid state at a highest position.

FIG. 5 is a side view showing a schematic configuration of an unloading device in which a gate is in an upright state at a highest position.

[Explanation of symbols]

 Reference Signs List 1 van type truck (vehicle) 10 support member 12 main frame (body frame) 2 tilt link 3 lift arm 31 pin at front end of lift arm 32 pin at rear end of lift arm 4 tilt cylinder 41 pin at front end of tilt cylinder 42 rear end of tilt cylinder Pin 5 Lift cylinder 51 Pin at front end of lift cylinder 52 Pin at rear end of lift cylinder 6 Gate G Ground X Unloader

Claims (3)

[Claims] A support member fixed to a vehicle body frame; a tilt link having a base end swingably connected to and away from the support member; and a base end having a pin connected to a base end of the tilt link. A lift arm rotatably connected via a pin, a gate rotatably connected to a tip of the lift arm via a pin, and a gate disposed below the lift arm, the support member and the gate respectively. A tilt cylinder rotatably connected via a pin; and a lift cylinder rotatably connected via a pin to a tip of the tilt link and a substantially central portion of the lift arm, respectively. The tilt link automatically swings in the direction away from the support member when it comes into contact with the ground, so that the tilt link pivots downward around the pin axis at the tip of the lift arm. Unloading device in the vehicle to be marked. 2. The apparatus according to claim 1, wherein the gate is vertically rotated about a pin axis at a tip end of the lift arm by extending and retracting a tilt cylinder at a highest position and a halfway position. An unloading device for a vehicle according to claim 1. 3. The gate according to claim 1, wherein the gate is extended upward around a pin axis at a tip end of the lift arm by extending a tilt cylinder at a highest position. An unloading device for a vehicle according to claim 1 or 2.