JP2012236479A - Rear car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear car which has at least a pair of rear wheels and one front wheel, and can flatly place a rear body in order to facilitate the loading and unloading of a cargo.SOLUTION: The rear car comprises a constitution of a parallel four-joint link composed of: an upper side link part 10 attached with at least a pair of the rear wheels 11, 11 and one front wheel 13; a lower side link part 20 which is arranged at the lower side of the upper side link part 10 and arranged integrally with the rear body; and turning link parts 31, 33 at the front side and the rear side which are linked to the upper side link part 10 so as to be turnable in the vertical direction at a position in which the lower link part 20 is displaced to the rear side of the rear car. A pulling handle 30 is arranged in a form that the handle is extended to the upper part of the rear-side turning link part 33, and the pulling handle 30 is turned frontward and fixed to the upper link part 10 when traveling and turned rearward when the lower side link part 20 is brought into a flat-placed state.

Description

  The present invention relates to a rear car including a loading platform portion on which a load is placed, a pull handle, at least a pair of rear wheels and one front wheel.

2. Description of the Related Art Conventionally, for the purpose of improving the storage performance of a rear car, it has been proposed that the pull handle can be assembled and can be folded in the width direction (left-right direction).
For example, a rear car type transporting vehicle is disclosed in which a handle is detachably fitted and fixed from a carriage and folded when not in use to reduce the length and the length in the width direction (see Patent Document 1).

  On the other hand, in the rear car, because there is a pair of tires, the loading surface of the load on the loading platform is at a certain height from the ground. Further, the rear car is held in a form in which the front part of the loading platform is low and the rear part is slightly raised. This is because a portion protruding downward from the bottom surface of the loading platform is basically not formed so that portions other than the tire do not come into contact with the vehicle while traveling, and the center of gravity is in front of the pull handle.

  In this way, since the rear part of the cargo bed including the rear end is stopped in a lifted state, it is difficult to load the cargo so as to be slid while being placed on the carriage, and it is necessary to lift it to the height of the cargo bed. . If there is an assistant, it is possible to lift the pull handle, rotate the loading platform around the tire, and load the luggage with the rear end of the loading platform in contact with the ground. Work is not efficient.

  Further, in the rear car, there is a problem that the loading platform is easy to rotate like a seesaw around the rotation axis of the tire, and it is difficult to load the cargo. For this, there is a person who has a pull handle and it is only necessary to hold the loading platform so as not to rotate, but it is not efficient because it is a work for two people. In addition, it is sufficient that an operator puts the load on the load bed appropriately considering the center of gravity of the load so that the load bed does not rotate like a seesaw. This is inconvenient.

For this, the present inventor has previously proposed a rear car having the following configuration.
In a rear car used to carry a load having a load carrier body, a pair of tires and a pull handle, a rotating shaft provided on the load carrier body so as to extend in the horizontal direction; A pair of tires is provided corresponding to the pair of tires, the tires are rotatably mounted, and the shaft is pivoted on the rotating shaft at a part spaced in the front-rear direction with respect to the rotational axis of the tire. When the tire is loaded and unloaded, the tire is positioned upward so that the loading platform body is in a solid state on the ground. A tire holding portion that is displaceably held, and extends forward from at least one of the tire holding portions. Change the tire vertically A forward extending portion provided to allow the tire holding portion to rotate around the rotation axis, and the front extending portion when the tire is positioned downward to travel. The loading platform body or the pull handle is provided so as to be connected and fixed, and when loading / unloading a load, the tire is positioned upward so that the loading platform body is placed on the ground. A connecting mechanism provided so as to be able to release the connection between the forward extending portion and the cargo bed body or the pull handle (see Patent Document 2);

  According to the present invention, when the rear car is stopped, the rear part of the cargo bed is in a floating state, and the cargo bed is easy to rotate like a seesaw so that it is difficult to load and unload luggage. Can solve the problem. That is, according to this, there is an advantageous effect that when the rear car is stopped, the loading platform is in a flat position, and the work of loading and unloading luggage can be easily performed.

JP 09-66834 A (first page) Japanese Patent No. 4542199 (first page)

The problem to be solved with respect to the rear car has been solved by the inventor's invention about the work of loading and unloading loads on an ordinary rear car having a pair of rear wheels. The rear car with the front wheels cannot be handled.
SUMMARY OF THE INVENTION An object of the present invention is to provide a rear car having at least a pair of rear wheels and a front wheel and capable of placing a cargo bed in a solid manner so that loading and unloading operations can be facilitated when the vehicle is stopped. It is in.

The present invention has the following configuration in order to achieve the above object.
According to one aspect of the rear car according to the present invention, in a rear car including a pull handle, at least a pair of rear wheels, and one front wheel, at least a pair of rear wheels and one front wheel are mounted as a link configuration of parallel four-bar links. An upper link portion, a lower link portion disposed under the upper link portion and integrated with the loading platform, and the lower link portion on the rear side of the rear car with respect to the upper link portion The front and rear rotating link portions are linked so as to be able to rotate in the vertical direction at a position shifted to the position, and the pull handle is extended above the rear rotating link portion. When the vehicle is traveling, the pulling handle is pivoted so as to tilt forward and is fixed to the upper link portion, and when the lower link portion as a loading platform portion is placed in a solid state, the pull handle is pulled backward. Like It is characterized in that it is rotated in the direction.

Further, according to one aspect of the rear car according to the present invention, in a rear car including a pull handle, at least a pair of rear wheels, and one front wheel, at least a pair of rear wheels and a front wheel as a link configuration of parallel four-bar links. Is attached to the upper link portion, the lower link portion is provided below the upper link portion and integrated with the loading platform portion, and the lower link portion of the rear car is connected to the upper link portion. A front side link and a rear side rotary link portion linked so as to be able to rotate in a vertical direction at a position shifted to the rear side; an extension portion extending upward from the front side rotary link portion; and an upper link A hydraulic cylinder device is provided between the lower link portion and the lower link portion serving as a cargo bed portion. When placing It is characterized by extending such that the extension portion is rotated rearward.
Further, according to one aspect of the rear car according to the present invention, it is possible to rotate between the extension portion extended upward from the rear rotation link portion, the extension portion and the extension portion of the front rotation link portion. And an upper link on the drive side that is movably connected.

  According to the rear car of the present invention, at least a pair of rear wheels and one front wheel are provided, and when the vehicle is stopped, a special advantageous effect is achieved in that the loading platform is placed in a flat position so that loading and unloading operations can be easily performed. Play.

It is a side view which shows the example of a form of the rear car concerning this invention. It is a side view which shows the state in which the loading platform part of the example of FIG. It is a side view which shows the other example of a rear car concerning this invention. It is a side view which shows the state in which the loading platform part of the example of FIG. FIG. 4 is a side view showing an example in which a link mechanism is applied to the drive side of the embodiment of FIG. 3. It is a side view which shows the state in which the loading platform part of the example of FIG.

Embodiments of the rear car according to the present invention will be described below with reference to the accompanying drawings (FIGS. 1 and 2).
This rear car includes a loading platform (a lower link section 20 to be described later) on which luggage is placed, a pull handle 30, at least a pair of rear wheels 11, 11 and one front wheel 13, and carries the luggage. Used for.

  The rear car has a parallel four-bar link structure, and is arranged on the upper link portion 10 on which at least a pair of rear wheels 11 and 11 and one front wheel 13 are mounted, and on the lower side of the upper link portion 10. A lower link portion 20 that is provided integrally with the loading platform portion, a front side that links the upper link portion 10 so that the lower link portion 20 can rotate in a vertical direction at a position shifted to the rear side of the rear car, and Rear rotation link portions 31 and 33 are provided.

  In this rear car, the pull handle 30 is provided so as to extend above the rear rotation link portion 33, and the pull handle 30 is tilted forward when traveling (see FIG. 1). It is rotated and fixed to the upper link part 10, and when the lower link part 20 as a loading platform part is set in a solid state (see FIG. 2), it is rotated so as to be lifted rearward.

According to this rear car, when the vehicle is stopped, the lower link portion 20 (loading portion) is placed on a flat surface so that loading and unloading operations can be easily performed. With a relatively simple configuration, it is possible to achieve a solid placement of the loading platform, and it can be easily manufactured at low cost.
The front wheel 13 is attached to the front extension portion of the upper link portion 10 via a front wheel holder so as to be rotatable about a vertical axis so that the direction can be changed.

Hereinafter, another embodiment of the rear car according to the present invention will be described with reference to the accompanying drawings (FIGS. 3 and 4).
In this rear car, the hydraulic cylinder device 40 is provided between the extension portion 31a extended upward from the front rotation link portion 31 and the upper link portion 10, and when the hydraulic cylinder device 40 travels ( 3), the extension 31a is shortened so as to be rotated forward, and the extension 31a is rearward when the lower link portion 20 as a loading platform is set in a solid state (see FIG. 4). Elongate to rotate. Other configurations are the same as those of the embodiment shown in FIGS. 1 and 2, and a description thereof will be omitted.

Even with this rear car, when the vehicle is stopped, the loading platform can be placed on a flat surface so that loading and unloading operations can be facilitated. The configuration is also simple and can be easily manufactured.
Reference numeral 35 denotes a brake pad, which is attached to the pull handle 30 and is provided by rubber or the like so as to contact the front wheel 13 and function as a brake.

Next, in addition to the embodiments shown in FIGS. 3 and 4, an embodiment in which a parallel four-bar link is applied to the drive side will be described with reference to FIGS.
An extension portion 33a extending upward from the rear rotation link portion 33, and an upper link on the drive side rotatably connected to the extension portion 33a and the extension portion 31a of the front rotation link portion 31 41. Other configurations are the same as those of the embodiment shown in FIGS. 3 and 4, and the description thereof is omitted.
According to this, a driving force can be disperse | distributed suitably and the raising / lowering operation | movement of the lower side link part 20 can be performed smoothly.

  About the raising / lowering mechanism which applied the parallel four-bar link of the loading platform part (lower side link part 20) of the structure shown to the above FIGS. 3-6, it can apply to the conveying apparatus which does not have the pulling handle 30. FIG. That is, as a transport device, as a link structure of a parallel four-bar link, an upper link portion on which at least a pair of rear wheels and one front wheel are mounted, and a lower base portion of the upper link portion are integrated with the loading platform portion. The lower link portion provided and the front and rear turn link portions that link so that the lower link portion can turn in the vertical direction at a position shifted to the rear side of the rear car with respect to the upper link portion. And a hydraulic cylinder device is provided between the extension portion extending upward from the front rotation link portion and the upper link portion, and when the hydraulic cylinder device travels, the extension portion Is extended so that the extension portion is rotated rearward when the lower link portion serving as a loading platform portion is placed in a solid state. . An extension portion extending upward from the rear rotation link portion; and a drive side upper link rotatably connected to the extension portion and an extension portion of the front rotation link portion. It can be characterized by comprising. In this case, the drive device is not limited to the hydraulic cylinder device, and other known devices can of course be applied.

  As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

DESCRIPTION OF SYMBOLS 10 Upper link part 11 Rear wheel 13 Front wheel 20 Lower link part 30 Pull handle 31 Front side rotation link part 31a Extension part 33 Rear side rotation link part 33a Extension part 40 Hydraulic cylinder apparatus 41 Upper link

Claims (3)

In a rear car comprising a pull handle, at least a pair of rear wheels and one front wheel,
As a link structure of the parallel four-bar link, an upper link portion on which at least a pair of rear wheels and one front wheel are mounted, and a lower link provided under the upper link portion and integrated with the loading platform portion. And a rotation link portion on the front side and the rear side that links so that the lower link portion can be rotated in the vertical direction at a position shifted to the rear side of the rear car with respect to the upper link portion,
The pull handle is provided so as to extend upward from the rear rotation link portion, and when traveling, the pull handle is rotated so as to be tilted forward and fixed to the upper link portion. A rear car that is rotated so as to be lifted rearward when the lower link portion serving as a loading platform portion is set in a solid state. In a rear car comprising a pull handle, at least a pair of rear wheels and one front wheel,
As a link structure of the parallel four-bar link, an upper link portion on which at least a pair of rear wheels and one front wheel are mounted, and a lower link provided under the upper link portion and integrated with the loading platform portion. And a rotation link portion on the front side and the rear side that links so that the lower link portion can be rotated in the vertical direction at a position shifted to the rear side of the rear car with respect to the upper link portion,
A hydraulic cylinder device is provided between an extension portion extending upward from the front rotation link portion and the upper link portion, and when the hydraulic cylinder device travels, the extension portion rotates forward. A rear car characterized by being contracted so as to be moved and extending so that the extension part is rotated rearward when the lower link part as a cargo bed part is set in a solid state.   An extension portion extending upward from the rear rotation link portion; and a drive-side upper link rotatably connected to the extension portion and the extension portion of the front rotation link portion. The rear car according to claim 2.

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