JP2003175760A - Underfloor accommodation type lifter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lift/lower and incline a platform only by an elevating cylinder and simplify piping and control systems in accordance with installation of the cylinder. <P>SOLUTION: This lift comprises a body frame 10 slidable to a chassis, the foldable platform 60 and a link mechanism for driving the platform 60 by connecting the body frame 10 and the platform 60. The link mechanism has a small arm 20 pivoted of the body frame 10, a main arm 25 pivoted to the middle position, the elevation cylinder 27, a vertical link body 40 pivoted to tip of the main arm 25 at the upper end part, a sub arm 35 forming a parallel link together with the main arm 25, and a fixing bracket body 40 connected with tip of the main arm 25. The platform 60 is connected with the fixing bracket body 40 so as to keep horizontal in an expanding state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device which is mounted on a rear portion of a vehicle such as a lorry for facilitating loading and unloading of cargo by lifting and lowering a platform.
In particular, it relates to an underfloor retractable lifting device having a structure in which a platform is folded and stored under the vehicle floor.

[0002]

2. Description of the Related Art Conventionally, as a lifting device to be mounted on a freight car, it has been common to use a rear gate of a freight car as a platform and to raise and lower a platform also serving as a rear gate by a link mechanism.

By the way, in a structure in which the vehicle body of a freight car does not have a gate, for example, a structure having a double door, a sliding door, an accordion door, a fully open side roof, etc., it is rather inconvenient if the platform also serves as the gate of the vehicle body. is there.

Therefore, Japanese Patent Application Laid-Open No. 8-150 proposed by the present applicant.
In the lifting device of Japanese Patent No. 869, the platform has a folded structure, and the platform is stored under the floor of the vehicle body in a folded state.

[0005]

By the way, JP-A-8-
In the 150869 publication, a cylinder for expanding and contracting one of the links of the elevating parallel link mechanism is used for the tilting operation of lowering the tip of the platform after landing, in addition to the elevating cylinder for elevating the deployed platform. , The piping to multiple cylinders and the control system become complicated,
There was a problem that the cost was also high.

[0006]

SUMMARY OF THE INVENTION In view of the above points, a first object of the present invention is to enable the platform to be raised and lowered and tilted only by the lifting cylinder, thereby simplifying the piping and control system associated with the cylinder installation. It is an object of the present invention to provide an underfloor retractable lifting device that can be realized at a low cost.

A second object of the present invention is that the platform has a three-part structure, can be compactly folded, and can be stored, can be applied to various vehicle types, and the platform in a deployed state can have a sufficient area. An object is to provide an underfloor retractable lifting device.

A third object of the present invention is to provide an underfloor retractable lifting device capable of easily performing fine tilt adjustment for horizontally setting the platform by the adjusting mechanism.

A fourth object of the present invention is to provide an underfloor retractable lifting device capable of reliably holding a platform stored under the floor in a folded state.

Other objects and novel features of the present invention will be clarified in the embodiments described later.

[0011]

In order to achieve the above object, an underfloor retractable lifting device according to the invention of claim 1 of the present application is
A body frame that is slidable in the front-rear direction with respect to the chassis side of the vehicle, a slide drive mechanism that pulls the body frame under the floor of the vehicle, a main plate, and an intermediate portion that is rotatably connected to the tip side of the main plate. A platform, which is composed of a plate and a tip side plate rotatably coupled to the tip side of the intermediate plate, and has a flat top surface in a deployed state, and the body frame side and the base end side of the main plate. And a lifting and lowering drive link mechanism for lifting and lowering the platform. The lifting and lowering drive link mechanism includes a small arm whose one end is pivotally attached to the body frame, and a base end portion at an intermediate position of the small arm. A main arm to which is pivotally attached, an elevating cylinder connected between the other end of the small arm and the tip end side of the main arm, and A stopper fixed to the body frame for preventing the arm from rotating, a vertical link body having an upper end pivotally attached to the tip of the main arm, and the body frame and the vertical body so as to form a parallel link with the main arm. A sub-arm connected between the lower ends of the link bodies and a mounting bracket body connected to the tip of the main arm are connected to the mounting bracket body so that the main plate is maintained in a horizontal state in a deployed state. It is characterized by the configuration.

According to a second aspect of the present invention, there is provided an underfloor retractable lifting device according to the first aspect, in which the positional relationship between the mounting bracket lower side and the vertical link lower side is adjusted. It is characterized by having an adjusting mechanism for adjusting the inclination of the platform connected to the.

An underfloor retractable lifting device according to the invention of claim 3 is the small arm according to claim 1 or 2, wherein the lifting cylinder is further contracted after the vertical link body has landed. Separates from the stopper,
When the position of the base end of the main arm is moved, the vertical link body and the mounting bracket body are tilted, and the tip of the platform in the expanded state is lowered.

The underfloor retractable lifting apparatus according to the invention of claim 4 of the present application is the apparatus according to claim 1, 2 or 3, wherein the tip plate is turned upside down on the intermediate plate, and the tip plate is further overlapped. It is foldable by turning over the intermediate plate overlaid on the main plate and stacking the intermediate plate, and when the platform in the folded state is inverted to the upper side of the main arm, a receiving roller that supports the lower surface of the platform is on the main body frame side. It is characterized by being supported by.

According to a fifth aspect of the present invention, there is provided an underfloor retractable lifting device according to the first, second, third or fourth aspect, in which the body frame and the folded platform are stored under the vehicle floor by the slide drive mechanism. At this time, the piece provided on the platform side is fitted into the recess on the chassis side.

An underfloor retractable lifting device according to a sixth aspect of the present invention is, in the first, second, third, fourth or fifth aspect, in a direction in which the main plate is erected between the mounting bracket body and the main plate. The feature is that a biasing torsion bar is provided.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an underfloor retractable lifting device according to the present invention will be described below with reference to the drawings.

1 to 9, a box-shaped vehicle body 2 is placed and fixed on a chassis 1 of a freight vehicle,
A fixed frame 4 of the underfloor retractable lifting device is fixed to a rear portion of a chassis 1 of a lorry. A square pipe slide guide 5 with a slit is fixed to the fixed frame 4.

Body frame 10 of the underfloor retractable lifting device
As shown in FIGS. 3, 5 and 6, a square pipe 11 serving as a connecting member, brackets 12 and 13 fixed to both sides thereof, and a pair of runners 14 provided inside the brackets on both sides. The runner 14 is fixed to the outer periphery of the square pipe 11 by a tightening member 19 integrated in the lower portion.

A runner 14 which is integral with the body frame 10 is provided on the slide guide 5 so as to be slidable in the lateral direction (front and rear direction of the vehicle). That is, a square plate-shaped sliding member 14a, such as a nylon resin, which slidably contacts the upper and lower inner surfaces of the slide guide 5 and has a small friction coefficient is fixed to both upper ends of the runner 14.
The upper part of 4 slides smoothly in the slide guide 5 without rattling. The lower portion of the runner 14 extends downward through the slit of the slide guide 5 to extend the square pipe 1.
Connected to 1. As shown in FIG. 6, the interval between the fixed frames 4 is determined by the width of the chassis 1, and the width of the chassis 1 changes depending on the vehicle model. However, by changing the tightening / fixing position of the tightening member 19 with respect to the square pipe 11, The distance between the runners 14 can be adjusted in accordance with the distance between the slide guides 5 on the fixed frame 4 side, so that the vehicle can be adapted to various vehicle types.

A slide drive hydraulic cylinder 15 for moving the runner 14 in the lateral direction (front-rear direction) is mounted on the fixed frame 4 side, that is, between the extended end of the slide guide 5 and the runner 14. The cylinder 15 and the runner 14 that slides in the slide guide 5 constitute a slide drive mechanism that drives the main body frame 10 in the lateral direction (front-rear direction). That is, the cylinder 15
In the extended state of the piston rod of the body frame 10
The (runner 14) approaches the rear end side of the floor portion 3 of the vehicle body 2, and conversely, in the contracted state, the main body frame 10 is retracted in the depth direction under the floor of the vehicle body.

As shown in FIG. 7, the upper end of the small arm 20 is pivotally attached (rotatably attached) to the bracket 12 of the body frame 10 by a pin 21, and the lower contact portion 20a of the small arm 20 is a square pipe. It contacts the stopper 16 on the 11 side. The base end portion of the main arm 25 is pivotally attached by a pin 26 to an intermediate position of the small arm 20, and the tip end portion is pivotally attached by an pin 31 to the upper end portion of the vertical link body 30. The lower end of the small arm 20 and the main arm 25
An ascending / descending hydraulic cylinder 27 is pivotally attached by pins 28 and 29 between the positions near the tip of the. Further, a sub arm 35 is pivotally attached by pins 36 and 37 between the bracket 13 of the main body frame 10 and the lower end portion of the vertical link body 30.
The main arm 25 and the sub arm 35 form a lifting drive link mechanism, and when the lower contact portion 20a of the small arm 20 is kept in contact with the stopper 16 on the side of the square pipe 11, both ends of the main arm 25 are maintained. The pins 26 and 31 of the part and the pins 36 and 37 of both ends of the sub arm 35 are respectively located at the vertices of the parallelogram, and when the lifting hydraulic cylinder 27 is contracted, the tip of the main arm 25 is lowered and extended. Sometimes the tip of the main arm 25 is in the raised position. The rotation of the small arm 20 due to the reaction force when the cylinder 27 extends is prevented by the lower contact portion 20a contacting the square pipe side stopper 16.

As shown in FIG. 7, the bracket 12 has a sensor 39 for defining the upper limit position of the main arm 25.
2 attached to the main arm 25
The pipe member 25a for connecting and fixing the plate members is in contact with the detection end of the sensor 39 at the upper limit position of the main arm 25. When the detection end of the sensor 39 is pushed, the operation of the lifting hydraulic cylinder 27 is stopped.

The upper base end side of the mounting bracket body 40 shown in FIG. 8 is pivotally attached by the pin 31 in common with the upper end portion of the vertical link body 30, and the adjusting mechanism 50 is attached to the lower part of the mounting bracket body 40. ing. This adjusting mechanism 50
The fixing bolt 51 is attached to the vertical portion 41 of the mounting bracket body 40.
Adjustment bolt 52 screwed through
The tip of 2 is adapted to be screwed into the female thread portion of the thread cutting pin 53 provided (fitted) at the lower portion of the vertical link body 30. The reinforcing plate 54 is the mounting bracket body 4
It is fixed along the inside of the vertical portion 41 of 0. And
By adjusting the rotation amount of the adjusting bolt 52, the positional relationship between the lower side of the mounting bracket body 40 and the lower side of the vertical link body 30 can be adjusted to adjust the inclination of the mounting bracket body 40. Lifting platform 6
The inclination of 0 can be adjusted. ). When the amount of rotation of the adjusting bolt 52 is determined, the fixing bolt 51 fixes the adjusting bolt 52 at the rotation position.

The lifting platform 60 comprises the main plate 6
1, an intermediate plate 62 rotatably connected to the tip side of the main plate and a tip side plate 63 rotatably connected to the tip side of the intermediate plate, and a double hinge (rotation fulcrum) between the plates. Double hinge with 2 points) 64
Each is foldable and connected. Main plate 61, intermediate plate 62, and tip side plate 63
Is a flat sheet having a flat upper surface in which the reinforcing member 61a on the back side of the main plate 61 and the reinforcing member 62a on the back side of the intermediate plate 62, and the end surface of the intermediate plate 62 and the end surface of the tip side plate 63 are butted against each other in a flattened state It is designed to function as a flat-plate platform. Further, in the folded state, the tip side plate 63 is turned over and overlaid on the intermediate plate 62, and further, these are turned over and overlaid over the main plate 61.

The mounting bracket body 40 and the main plate 6
A link 65 is rotatably connected to the one base end portion.
That is, one end of the link 65 is pivotally attached to the mounting bracket body 40 by a pin 66 and the other end is pivotally attached to the main plate 61 by a pin 67 so that the link 65 and the pins 66 and 67 function as a double hinge. Has become. When the lifting platform 60 is deployed, the vertical portion 41 of the mounting bracket body 40 and the reinforcing member 61a on the back side of the main plate 61 contact each other, so that the main plate 61 is maintained in a horizontal state with respect to the mounting bracket body 40.

A platform support arm 70 is fixed to a position near the center of the square pipe 11. The platform support arm 70 extends horizontally to the rear side of the chassis 1 of the freight vehicle, and the tip of the support arm 70 is provided. The receiving roller 71 is pivotally attached to the (rear end). The receiving roller 71 functions to contact and support the back side of the intermediate plate 62 when the elevating platform 60 is folded and stored as shown in FIGS. 2 and 5.

As shown in FIGS. 8A, 8B, and 8C, the mounting bracket body 40 and the main plate 6 of the platform 60 are mounted.
A pair of torsion bars 75 for urging the main plate 61 vertically to the mounting bracket body 40 are provided between the pair of torsion bars 75. That is, one bent end portion 75a of the torsion bar 75 penetrates the pins 66 and 67 that stop the link 65 connecting the mounting bracket body 40 and the main plate 61 to prevent the pins 66 and 67 from coming off, and the other bent end portion 75a. The portion 75b is fixed to the back side of the main plate 61. Main plate 61 and intermediate plate 6
A torsion bar 76 for urging the intermediate plate 62 vertically to the main plate 61 is also provided between the two. Further, if necessary, the intermediate plate 6
A torsion bar having a similar function may be provided between the 2 and the tip side plate 63.

A wedge-shaped piece 80 fixed to a vertical mounting plate 81 is fixed to the back side of the main plate 61.
As shown in FIGS. 3 and 4, a holding member 85 having a concave portion 86 corresponding to the wedge-shaped piece 80 is fixed to the chassis 1 side.
Then, when the lifting platform 60 in the folded state from the state of FIG. 3 is pulled under the floor of the freight vehicle as shown in FIG. 4, the wedge-shaped pieces 80 are fitted into the recesses 86. This mechanism prevents the hoisting and lowering platform 60 in a folded state from being vibrated and damaged or generating noise when the truck is running.

Next, the operation of the embodiment of the underfloor retractable lifting device will be described.

When carrying out normal cargo handling work, as shown in FIG. 1, the slide driving hydraulic cylinder 15 is extended and the runner 14 and the main body frame 10 are slid to a state close to the floor end portion of the vehicle body 2. The main plate 61, the intermediate plate 62, and the tip-side plate 63, which constitute the lifting platform 60, are deployed in a flat plate shape (folding and unfolding operations of the lifting platform 60 are performed manually). And
By moving the lifting hydraulic cylinder 27 that drives the main arm 25 of the lifting drive link mechanism to extend or contract, the main arm 25 and the sub arm 35 in the parallel link state are rotated to move the platform 60 to the solid line in FIG. From the landing state of b) to the position of the solid line (b) of the height of the floor surface 3A of the vehicle body 2 (the upper surface of the floor portion 3) while maintaining the horizontal state, or from the height of the floor surface 3A to the landing state It is possible to perform the cargo handling work from the ground to the floor of the vehicle body or from the floor of the vehicle body to the ground by using the lifting operation of the platform 60. Further, when the lifting hydraulic cylinder 27 is further contracted in the landing state of the lifting platform 60, the lower contact portion 20a of the small arm 20 causes the stopper 1 on the square pipe 11 side.
6 away from the main arm 25 mounting fulcrum (pin 26)
Moves to the rear side of the vehicle body 2, the tilting operation of the lifting platform 60 is executed as shown by the phantom line (c) in FIG.
It is also possible to efficiently carry in or carry out luggage from the platform 60 in the landing state.

The normal platform storing operation after the end of cargo handling is performed as follows. In the landing state of the lifting platform 60 indicated by the solid line (a) or (c) in FIG. 1, the tip side plate 63 is first turned over and overlapped on the intermediate plate 62, and then both are inverted as shown in FIG. The plate 61 is overlapped and folded. This operation can be easily performed by a manual operation by the action of the torsion bar 76 of FIG. 8 that urges the intermediate plate 62 to stand upright with respect to the main plate 61.

Next, the main plate 61 is erected with respect to the mounting bracket body 40, and is leaned against the back side of the intermediate plate 62 against the receiving roller 71 at the tip of the supporting arm 70 as shown in FIG. By extending the lifting hydraulic cylinder 27, the main arm 25 and the sub arm 35 are made substantially horizontal as shown in FIG. 3, and the folded lifting platform 60 is placed on the receiving roller 71.

By contracting the slide driving hydraulic cylinder 15 from the state shown in FIG. 3, the lifting platform 60 folded as shown in FIG. 4 is drawn under the floor of the vehicle body 2, and the wedge-shaped piece 80 on the platform 60 side is moved to the chassis. 1
It fits into the concave portion 86 on the side.

The operation of unfolding the lifting platform 60 from the retracted state so that it can be loaded is the reverse of the retracting operation. First, the slide driving hydraulic cylinder 15 is extended to move the runner 14 and the main body frame 10 of the vehicle body 2. The floor 3 is moved to the rear end side, and then the lifting hydraulic cylinder 27 is contracted to lower the main arm 25 and the sub arm 35 until the landing state is reached, and the folding lifting platform 60 is unfolded. The platform shape will be flat.

According to this embodiment, the following effects can be obtained.

(1) The platform can be moved up and down and tilted only by the lifting hydraulic cylinder 27 and the lifting link mechanism, and the piping and control system associated with the installation of the hydraulic cylinder can be simplified, and the cost can be reduced. It is possible. That is, the base end portion of the main arm 25 is not directly pivotally attached to the main body frame 10, but the main body frame 10 is connected via the small arm 20.
When the vertical link body 30 is in the landing state, the vertical hydraulic cylinder 27 is further contracted to separate the small arm 20 from the stopper 16 on the main body frame 10 side, and the main arm 25 base end portion. By moving the position (to the rear of the vehicle body), the vertical link body 30 and the mounting bracket body 40 are tilted, and the tip end of the platform 60 in the deployed state can be tilted.

(2) During normal loading and unloading, the lifting platform 60 can be driven up and down by the lifting link mechanism while maintaining the horizontal state, and the lifting platform 60 can be used to smoothly carry out the loading and unloading work. Further, the elevating platform 60 is formed by connecting the three plates of the main plate 61, the intermediate plate 62 and the tip side plate 63, and can be folded compactly to store the elevating platform 60 under the floor of the vehicle body. For this reason, the applicable vehicle types are expanded. Further, it is possible to make the platform 60 in the deployed state have a sufficient area.

(3) Ascending / descending platform 6 as shown in FIG.
Since the adjusting mechanism 50 is provided between the mounting bracket body 40 in which 0 is connected and the vertical link body 30 forming the vertical portion of the lifting parallel link mechanism, the inclination of the mounting bracket body 40 with respect to the vertical link body 30, and thus the lifting platform. 6
The inclination of 0 can be finely adjusted. That is, it becomes possible to finely adjust the horizontal degree of the elevating platform 60 during deployment.

(4) Mounting bracket body 40 as shown in FIG.
A torsion bar 75 for urging the main plate 61 to stand up between the main plate of the lifting platform 60 and the lifting bar 60.
Is provided between the main plate 61 and the intermediate plate 62.
Torsion bar 76 for urging the vertical upright position
Is provided, it is possible to easily perform folding and unfolding operations of the lifting platform 60 by manual operation.

(5) When the main body frame 10 and the folded platform 60 are stored under the vehicle floor by the slide drive mechanism (slide guide 5, runner 14 and hydraulic cylinder 15 for slide drive), they are provided on the platform 60 side. The wedge-shaped piece 80 is a concave portion 86 on the main body frame 10 side.
It is possible to prevent the folding platform 60 in a folded state from vibrating to generate noise or damage during traveling of the vehicle.

Although the embodiment of the present invention has been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Ah

[0043]

As described above, according to the underfloor retractable lifting apparatus according to the present invention, the platform can be lifted and tilted only by the lifting cylinder, and the piping and control system associated with the cylinder installation can be simplified. It is possible to reduce the cost.

Further, since the platform has a three-part structure, it can be folded and stored compactly, can be applied to various vehicle types, and the platform in a deployed state can have a sufficient area.

[Brief description of drawings]

FIG. 1 is a side view illustrating an up-and-down operation of an up-and-down platform which is an embodiment of an underfloor retractable up-and-down apparatus according to the present invention.

FIG. 2 is a side view showing a folding operation of the lifting platform according to the embodiment.

FIG. 3 is a side view showing a state in which the lifting platform according to the embodiment is completely folded and before being stored.

FIG. 4 is a side view showing a state where the lifting platform according to the embodiment is completely stored.

FIG. 5 is a plan view in which a part of the lifting platform is cut away when the lifting platform is completely stored in the embodiment.

FIG. 6 is a front view of the same.

FIG. 7 is a side view mainly showing a lifting link mechanism portion in the embodiment.

FIGS. 8A and 8B are a side view, FIG. 8B is a plan view, and FIG. 8C is a front view in a folding completed state of the lifting platform according to the embodiment.

FIG. 9 is a side view showing a vertical link body, a mounting bracket body, and an adjusting mechanism in the embodiment.

[Explanation of symbols]

1 chassis 2 car body 3 floor 4 fixed frame 5 Slide guide 10 body frame 11 square pipe 12,13 bracket 14 Lanna 15 Square plate sliding member 16 stopper 19 Tightening member 20 small arms 25 main arm 27 Lifting hydraulic cylinder 30 Vertical link body 35 sub arm 40 mounting bracket body 50 adjustment mechanism 51 fixing bolt 52 Adjustment bolt 53 threaded pin 60 lifting platform 61 Main plate 62 Intermediate plate 63 Tip plate 70 platform support arm 71 Receiver roller 75,76 torsion bar 80 wedge-shaped pieces 85 holding member 86 recess

Claims (6)

[Claims] 1. A body frame that is slidable in the front-rear direction with respect to a chassis side of a vehicle, a slide drive mechanism that pulls the body frame under the floor of the vehicle, a main plate, and a pivotable end side of the main plate. A platform having a flat plate upper surface in an unfolded state, the platform including an intermediate plate connected to the intermediate plate and a distal end side plate rotatably connected to the distal end side of the intermediate plate; An elevating and lowering drive link mechanism for connecting the end side and elevating and lowering the platform. The elevating and lowering drive link mechanism includes a small arm whose one end is pivotally attached to the body frame, and an intermediate portion of the small arm. A main arm whose base end is pivotally attached to a position, an elevating cylinder connected between the other end of the small arm and the tip side of the main arm, and the elevating cylinder extension A stopper fixed to the main body frame for preventing rotation of the small arm due to a reaction force, a vertical link body having an upper end portion pivotally attached to the tip end portion of the main arm, and a parallel link together with the main arm. It has a sub-arm connected between the main body frame and the lower end of the vertical link body, and a mounting bracket body connected to the tip end of the main arm, and the main plate of the mounting bracket body keeps horizontal in a deployed state. An underfloor retractable lifting device characterized in that it is connected as described above. 2. An adjusting mechanism for adjusting the positional relationship between the lower side of the mounting bracket body and the lower side of the vertical link body to adjust the inclination of the mounting bracket body and the platform connected thereto. The underfloor retractable lifting device according to claim 1. 3. The small arm is separated from the stopper by further retracting the lifting cylinder after the vertical link body is in a landing state, and the position of the base end portion of the main arm is moved. The underfloor retractable lifting device according to claim 1 or 2, wherein the vertical link body and the mounting bracket body are tilted, and the tip of the platform in the deployed state is lowered. 4. The platform is foldable such that the tip side plate is turned over and overlapped on the intermediate plate, and the intermediate plate on which the tip side plate is overlapped is turned over and overlapped on the main plate.
The underfloor retractable lifting device according to claim 1, 2 or 3, wherein a receiving roller that supports a lower surface of the platform when the platform in the folded state is turned over to the upper side of the main arm is supported by the main body frame side. 5. The piece provided on the platform side fits into the recess on the chassis side when the main body frame and the folded platform are stored under the vehicle floor by the slide drive mechanism. The underfloor retractable lifting device according to 2, 3, or 4. 6. The underfloor retractable type according to claim 1, wherein a torsion bar is provided between the mounting bracket body and the main plate to urge the main plate to stand up. lift device.