This application claims the priority of Taiwanese Invention Patent Application No. 094119036 filed Jun. 9, 2005.
1. Field of the Invention
The present invention relates to a fastener, more particularly to a fastener for securing and positioning a container on the deck of a cargo vessel or ship.
2. Description of the Related Art
Generally, when containers are being transported in a cargo vessel or ship, the containers are stacked on the deck of the ship and secured by fasteners in order to prevent undesired movement or toppling down of the stacked containers.
The hollow tubular connector 11 is formed by a cylindrical wall 112 enclosing an internal cavity 111 and having two opposed ends, a first bore 113 being formed at one of said opposed ends and a threaded second bore 114 being formed at the other one of said opposed ends. A filling hole 115 is formed on the cylindrical wall 112 in communication with the internal cavity 111 for introducing lubricant therein.
As shown in
The elastic element 12 is received in the cavity 111 of the connector 11 and is disposed around the stem 132 of the first pull rod 13 to exert a biasing force against the retaining head 131.
When the ship pitches and rolls in a stormy sea thus swaying the stacked containers 71, the elastic element 12 utilizes its own elastic restoring force to push against the retaining head 131 of the first pull rod 13 in a direction opposite the pulling direction of the first pull rod 13, thereby providing a tightening tension between the first and the second pull rods 13,14. Thus, no loosening or disengagement of the pull rods 13,14 from the connector 11 occurs in the course of the swaying motion of the ship.
However, while lubricant may be injected into the filling hole 115 to promote smoothness of compression and expansion of the elastic element 12, only liquid lubricants can be used due to the limited size of the filling hole 115. Such limitation in use is certainly a disadvantage.
Furthermore, in order to avoid interference with the smoothness of the sliding movement of the retaining head 131 of the first pull rod 13, the diameter of the internal cavity 111 of the connector 11 must be made slightly larger than the size of the retaining head 131. This will cause a larger gap (space) to be formed between the elastic element 12 and the cylindrical wall 112, which in turn could easily cause distortion and dislocation of the elastic element 12 to occur when the elastic element 12 is being compressed by the retaining head 131. When the fastener 1 is under a considerably large pulling tension, the elastic element 12 can easily deform and fracture, thus leading to ineffective fastening. Since the elastic element 12 is hidden within the connector 11, the condition of compression of the elastic element 12 cannot be viewed. In view of this, failure of the elastic element 12 cannot be observed from the outside, and this could be dangerous.
Therefore, a main object of the present invention is to provide an improvement over a fastener of the type described above in which the elastic element therein is exposed for immediate viewing and is well constraint to prevent distortion or dislocation thereof during use.
Accordingly, the present invention provides a fastener for fastening a cargo container which comprises a hollow connector including opposed first and second end members, a receiving cavity between the first and second end members, the first end member having a first bore and the second end member having a second bore; a first pull rod having an end extending threadedly through the first bore into the receiving cavity; a second pull rod extending threadedly through the second bore into the receiving cavity, a retaining head being attached to the second pull rod; and an elastic element 3 disposed around the second pull rod between the second end member and the retaining head for biasing the retaining head to move away from the second end member, wherein the receiving cavity is open to expose the elastic element and the retaining head.
Preferably, the fastener according to the present invention further include a limiting unit disposed between the retaining head and the second end member outwardly of the elastic element for preventing the elastic element from moving distortedly.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, in which:
With reference to
The hollow connector 2 includes opposed first end member 26 and second end member 25, a pair of spaced-apart frame rods 21 each having opposite ends connected to the first and second end members 26,25, and a receiving cavity 22 formed between the first and second end members 26,25 and defined by the frame rods 21. The first end member 26 has a threaded first bore 24 while the second end member 25 has a second bore 23. The frame rods 21 each have an inner face 20 confronting the receiving cavity 22 and two outer end faces 210 on the two opposite sides of the inner face 20, and the receiving cavity 22 has two opposite openings 22a,22b immediately adjacent the outer end faces 210. Thus, the receiving cavity 22 is open to expose the elements received therein, as will be described in more detail below.
The first pull rod 41 has a threaded first end 411 extending threadedly through the first bore 24 into the cavity 22 and a second end 412 for fastening to deck fittings on a ship. The second pull rod 42 extends slidably through the second bore 23 into the cavity 22, and has a threaded first end 420 to which a retaining head 421 is attached, and a second end 422 for fastening a cargo container (see
The elastic element 3, in the present embodiment, is a compression spring having two opposed ends 31,32 and being disposed around the second pull rod 42 within the cavity 22 between the second end member 25 and the retaining head 421 for biasing the retaining head 421 to move away from the second end member 25. The elastic element 3 and the retaining head 421 are exposed through either of the openings 22a,22b of the receiving cavity 22.
The limiting unit 5 is confined in the receiving cavity 22 of the hollow connector 2 and is disposed between the retaining head 421 and the second end member 25 outwardly of the elastic element 3 to prevent the elastic element 3 from moving distortedly. The limiting unit 5 is displaceable only along an extension direction of the frame rods 21, designated X in the drawings (see
With reference to
It is worth mentioning that, because the cavity 22 of the hollow connector 2 is open to expose the elastic element 3, various types of lubricants, e.g., a liquid lubricant or a viscous form of lubricant, may be applied thereto. Further, because the protective walls 52 of the limiting unit 5 are positioned over the openings 22a,22b of the cavity 22 such that the elastic element 3 is confined between the protective walls 52 and between the respective inner faces 20 of the frame rods 21, the elastic element 3 thus can extend or contract only within the confined space and will not be displaced or dislocated in the process of extension or contraction (compression) thereof. Certainly, the compression condition of the elastic element 3 may be directly viewed or observed through either of the openings 22a,22b of the cavity 22 of the hollow connector 2.
With reference to
While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Number | Date | Country | Kind |
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94119036 A | Jun 2005 | TW | national |
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Number | Date | Country | |
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20060280549 A1 | Dec 2006 | US |