Land vehicles: bodies and tops – Bodies – End gates
Patent
1997-09-11
2000-09-19
Dayoan, D. Glenn
Land vehicles: bodies and tops
Bodies
End gates
29614612, 49345, 49386, B60J 510, B62D 3304
Patent
active
061200808
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a springing up (suspension) apparatus for the door (especially the rear door of a cargo box) of a van-type truck. More particularly, the invention relates to a suspension apparatus for the rear door of a van-type truck for the purpose of facilitating the opening and closing of a so-called suspended-type rear door, the door being the rear door of the cargo box of a van-type truck of the type in which a cargo box (in the shape of a rectangular parallelepiped, for example) is formed on a truck bed, wherein the door is opened and closed by rotating the door using the upper side (a horizontal axis) of the rear of the container as the axis of rotation,
BACKGROUND ART
Trucks include so-called van-type trucks which, as shown in FIG. 15, have a cargo box 1 of the sealed kind for the purpose of protecting cargo from rain, wind and dust and to prevent loss and theft of the cargo. However, in order to load and unload cargo, it goes without saying that a large opening is required.
Conventionally, a rear door of the kind shown in FIGS. 16, 17 [in both of which (A) is a side view and (B) a front view] is used for this purpose. More specifically, in FIG. 16, a rear door 2 of the cargo box 1 is composed of an upper door 2a and a lower 2b that are separate of each other. The upper door 2a is opened and closed by being rotated about an upper shaft 3a, and the lower door 3b is opened and closed by being rotated about a lower shaft 3b.
In FIG. 17, a rear door 2 constitutes a single body and is opened and closed by being rotated about a shaft 3.
In the view of the inventor, however, a rear door of this conventional type is disadvantageous in that a large moment is produced about the shaft, owing to the door's own weight, during the operation for opening and closing the rear door, thus making it difficult for a large-size door to be opened and closed by human power.
A rear door suspension apparatus of the kind shown in FIG. 18 [in which (A) is a front view and (B) a side view] has been proposed heretofore. In this case an air damper 4 is fitted between the rear door 2 and a cargo box body 1a in the manner illustrated. A gas such as compressed air is sealed within a cylinder 4a of the air damper 4. The moment produced by the door's own weight during the opening-and-closing operation is supported by the pressure of the gas, thus making it easy to open and close the door by human power.
In the view of the inventor, however, a drawback in the case of this proposed apparatus is that a sealing portion 4b of the cylinder sustains wear and allows the interior gas to leak out when the door is opened and closed frequently. Further, if cargo 5 is large in size, the air damper 4 can be damaged by the cargo, as indicated at arrow P, when the cargo is handled, and this can lead to leakage of the gas.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to solve the aforementioned drawbacks of the rear door of a van-type truck and provide a springing up (suspension) apparatus for the door (especially the rear door of the cargo box) of a van-type truck which makes it possible to open and close even a large door easily by human power, wherein the apparatus will not readily be damaged even by cargo of large size.
Another object is to provide a suspension apparatus for the door (especially the rear door of the cargo box) of a van-type truck, in which the door can be opened and brought to rest at a desired position.
Other objects will become apparent from the overall description of this application.
The present invention is based on the fact that when a second end of a first arm having a first end pivotally attached to a cargo box body and a second end of a second arm having a first end pivotally attached to a door (especially a rear door of the cargo box) are pivotally attached to each other, any point on the second arm will move relative to both the cargo box body and the door as the door is opened and closed, and the invention is characterized in that a spring is loaded b
REFERENCES:
patent: 2162381 (1939-06-01), Guth
patent: 2220766 (1940-11-01), Hubbs
patent: 2711343 (1955-06-01), Falk et al.
patent: 3770314 (1973-11-01), Borskey
patent: 3837701 (1974-09-01), Curtis et al.
patent: 3922816 (1975-12-01), Hormann
Hori Masaki
Sugimoto Katsumi
Dayoan D. Glenn
Seiko Giken Kabushiki Kaisha
Wells Chad D.
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