JP2005061602A - Directive bolt and nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem on bolt and nut threads which are vertically symmetrical to a perpendicular in the axial direction and which have no directivity to axial force because of the angles of the threads being the same to the perpendicular in the axial direction, that fixation with a bolt and a nut gets loose with outer force due to vibration or expansion. <P>SOLUTION: The angles of the threads of the bolt and the nut are changed into asymmetrical forms to give directivity to externally received force. Thus, the bolt and the nut are hardly loosened. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a shape that suppresses the occurrence of a loosening phenomenon caused by a force applied by vibration or expansion and contraction of a bolt and a nut.

  For fixing with conventional bolts and nuts, double fixing of nuts, anti-loosening washers, e-rings, nuts with anti-loosening rings and application of anti-loosening inhibitors are used.

Problems to be solved by the invention

  In the conventional technology, since the shape of the screw thread itself is vertically symmetric, there is no directionality of the force against the external force. For this reason, a phenomenon of loosening occurs in fixing with bolts and nuts due to external forces such as vibration and expansion and contraction. In order to suppress this phenomenon, double fixing of nuts, anti-loosening washers, e-rings, nuts with anti-loosening rings and application of anti-loosening inhibitors are used.

Means for solving the problem

  The present invention suppresses loosening by changing the shape of the screw thread itself from vertically symmetric to vertically asymmetric to give directivity to external forces such as vibration and expansion / contraction.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings.
FIG. 1 shows the shapes of bolts and nuts conventionally used, and one screw thread has a vertically symmetrical shape at the same angle with respect to an axial perpendicular line.

  The present invention has the shape shown in FIGS. 2 and 3, and has an asymmetrical shape with a difference in the angle to the perpendicular to the axial direction, such as 2 thread, 3 thread, 4 thread and 5 thread, and vibration, expansion and contraction, etc. Suppresses loosening by giving directivity to external force.

The invention's effect

  In the present invention, when connecting and fixing an object, two threads and three threads are used, and the drag force is increased with respect to the direction of the tightening force. When holding and fixing at regular intervals, 4 threads and 5 screws are used, and loosening is suppressed by increasing the drag against the direction of the force compressing the regular intervals.

Drawing 1

  Sectional drawing of the volt | bolt and nut which are carrying out the symmetrical shape at the same angle with respect to the perpendicular of the conventional axial direction.

Drawing 2

  Sectional drawing of the volt | bolt and nut from which an angle differs with respect to the perpendicular of the axial direction of this invention, and has an up-down asymmetrical shape.

Drawing 3

  Sectional drawing of the volt | bolt and nut from which an angle differs with respect to the perpendicular of the axial direction of this invention, and has an up-down asymmetrical shape.

Explanation of symbols

1 symmetric thread
2 Asymmetric screw threads
3 Asymmetric screw threads
4 Asymmetric screw threads
5 Asymmetric screw threads

Claims (1)

Bolts and nuts that have an asymmetric shape with respect to the axial perpendicular to change the angle of the screw threads of the bolts and nuts to give direction to the force received from the outside, and to make bolts and nuts difficult to loosen.

Images