Expanded – threaded – driven – headed – tool-deformed – or locked-thr – With means to indicate application of predetermined... – Axially deformable member or portion
Reexamination Certificate
1999-02-02
2001-04-24
Wilson, Niell (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
With means to indicate application of predetermined...
Axially deformable member or portion
C411S278000, C411S432000, C411S533000
Reexamination Certificate
active
06220801
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is related to a free-running-on, locking-off and tension directly indicated locking nut, which engages with a bolt with zero loading resistance, automatically produces loose resistant torque when fastened on a workpiece, and indicates whether the locking nut is fastened with the required axial tension by showing the change in the clearance between the body portion and the cap.
2. Description of the Prior Art
It has been found that the fastener composed of nut and bolt is an important element for the assembly of an object. The fastener is applicable in many fields, such as the steel structure of a building and even an household apparatus, and is an inevitable element for the engagement between workpieces or assembly of machine platforms. However, the engagement of the conventional nut and bolt will become loose or even disengaged when subjected to external force or other factors. Hence, it has been proposed to mount a packing between the nut and the workpiece in order to prevent this drawback. This is the best method for a static workpiece which might be dismantled in the future or which is a lightweight static member. Nevertheless, this method is not applicable to dynamic machines as the engagement between the nut and bolt will become loose when subjected to longtermed vibration. Similarly, this method is not applicable to the workpiece which will not be dismantled once secured. Thus, it has been proposed to insert fit a nylon member on the internal threads of the nut so as to strenghen the engagement between the nut and bolt. Nevertheless, this expedient is not applicable to a workpiece which is subjected to high temperature, acid or alkaline circumstance, as nylon will be melted at high temperature and dissolved in acid or alkaline circumstance, thereby rendering this expedient useless to strengthen the engagement between nuts and bolts. Furthermore, an expensive tension measuring device must be used in order to measure the tension required for locking the nut.
Therefore, it is an object of the present invention to provide a free-running-on, locking-off and tension directly indicated locking nut which can obviate and mitigate the above-mentioned drawbacks.
SUMMARY OF THE INVENTION
This invention is related to a free-running-on, locking-off and tension directly indicated locking nut.
According to a preferred embodiment of the present invention, a free-running-on, locking off and tension directly indicated locking nut, includes a body portion formed with a base and a conical seat portion extending upwardly from a central portion of a top of the base, the seat portion having an upper end formed with a vertical outer wall surface, the body portion having an axial hole extending through the body portion and provided with internal threads, and a cap having an axial through taper hole which is smaller than the conical seat portion in height, the axial through taper hole being formed with a conical surface with a large diameter at a bottom thereof, a neck with a vertical surface extending upwardly from a top of the conical surface, and a chamfer extending upwardly outwardly from a top of the neck to form a countersink, the conical surface being configured to fit over the conical seat portion.
It is the primary object of the present invention to provide a free-running-on, locking-off and tension directly indicated locking nut, which can engage with a bolt at zero loading resistance, automatically produce loose resistant torque when fastened on a workpiece, and indicate whether the locking nut is fastened with the required axial tension by showing the change in the clearance between the body portion and the cap.
It is another object of the present invention to provide a free-running-on, locking-off and tension directly indicated locking nut, which is smooth, convenient and safe in operation and can be produced at low cost.
REFERENCES:
patent: 1969223 (1934-08-01), Kotvis et al.
patent: 4717299 (1988-01-01), Underwood
patent: 4971498 (1990-11-01), Goforthe
patent: 2051285 (1981-01-01), None
Dougherty & Troxell
Wilson Niell
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