Patent Application
20100310337
(a) Field of the Invention
The present invention relates to a bolt, and particularly relates to loose resistant bolt structure.
(b) Description of the Prior Art
A prior art bolt, such as a spoke of a bicycle, is generally combined with a nut of a wheel rim by loose resistant glue or anti-disengagement plastic lacquer with coating for preventing from disengagement. However, this structure can not be detached or loosened to be readjusted after it is assembled.
In order to solve the problem, a loose resistant spoke is addressed. As seen from
Because of restraint of the high stress while being assembled, the threaded portion 43, which has been bent, is pulled straight by external force. In this event, the threaded portion 43 can not resist loose. Moreover, the threaded portion 43 tends to damage inner threads of the nut. The bent structure of the threaded portion 43, in practice, can not take into effect for resisting loose.
In view of the above, a main object of the present invention is to provide a loose resistant bolt structure which has a buffer portion forming a distinct pitch different from a pitch of the threaded portion, wherein when the threaded portion engages with a nut, the buffer portion is drawn, shrunk or twisted, producing elastic stress and torsion force, thereby securing the threaded portion to the nut, and avoiding an inner thread of the nut caused damage, and preventing from disengagement therebetween.
A loose resistant bolt structure in accordance with the present invention comprises a bolt unit and a buffer portion. The bolt unit includes an intermediate portion, a head portion at an end of the intermediate portion, and a threaded portion at an opposite end of the intermediate portion. The buffer portion surrounds the threaded portion and is located adjacent to an end of the bolt unit.
To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments.
The bolt unit 1 comprises an intermediate portion 11, a head portion 12 at an end of the intermediate portion 11, and a threaded portion 13 at an opposite end of the intermediate portion 11.
The buffer portion 2 surrounds the threaded portion 13 and is located adjacent to an end of the bolt unit 1. The buffer portion 2 has an outer diameter smaller than that of the threaded portion 13, and in this embodiment, is shaped of consecutive curves. The buffer portion 2 is made by forging, stamping and bending at an appropriate portion of the threaded portion 13 in sequence.
In practical use, the bolt unit 1 is made to a spoke of a wheel of a bicycle, a screw or other bolt device. As an example, the bolt unit 1 is made to a spoke of a bicycle (not shown). The head portion 12 of the bolt unit 1 engages with a hub (not shown). The threaded portion 13 engages with a nut 3 of a wheel rim of the bicycle. The intermediate portion 11 of the bolt unit 1 supports to engage the bolt unit 1 and the hub. When the threaded portion 13 engages with the nut 3, the threaded portion 13 is threadedly inserted into an inner thread 31. The buffer portion 2 forms a distinct pitch different from a pitch of the threaded portion 13. When the threaded portion 13 engages with the nut 3, the buffer portion 2 is drawn, shrunk or twisted, producing elastic stress and torsion force, thereby securing the threaded portion 13 to the nut 3, and avoiding the inner thread 31 of the nut 3 caused damage, and preventing from disengagement therebetween.
As seen from
It is of course to be understood that the invention may be embodied in other forms without departing from the spirit thereof. Thus, the present examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.
