JPH066271Y2 - Loosening prevention nut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a nut that, once screwed into a bolt, does not loosen due to vibration or the like and can be removed at any time.

[Conventional technology]

In order to prevent loosening of the nuts, conventionally, two nuts are stacked and screwed, a spring washer is used, or the screwed nuts are non-rotatably fixed to bolts. Etc. are known.

[Problems to be solved by the device]

Although each of the above-mentioned means is simple, there is a problem that it is slightly unreliable.

An object of the present invention is to provide a nut that can prevent looseness more reliably than the conventional one.

[Means for Solving the Problem] The present invention provides an upper portion in which a proper number of through holes and bottomed holes are formed in the peripheral edge portion, and engaging pieces protruding in parallel with the axis line are provided on both side portions of the lower surface. Screw holes are drilled in the nuts and in the locations corresponding to the insertion holes of the upper nut, and a suitable number of bottomed holes facing the centripetal direction are drilled in appropriate places on the side surface and parallel to the axis at the peripheral edge of the top surface. A protruding ring that protrudes and can come into contact with the lower surface of the upper nut, and a notch that can be engaged with the engaging piece of the upper nut are provided, and an annular groove is cut near the upper surface. The above-mentioned problem is solved by a nut having a lower nut having a thin flexible portion formed on the lower nut, and a fixing screw that can be inserted into the insertion hole of the upper nut and screwed into the screw hole of the lower nut. Is.

[Action]

In the nut of the present invention, the upper and lower nuts can be individually tightened by the bottomed holes provided in the upper and lower nuts. Further, by engaging the engaging pieces of the upper and lower nuts with the notches, it is possible to tighten both the upper and lower nuts in the axial direction and the radial direction at the same time. Furthermore, when both nuts are screwed into the bolt, the projecting ring of the lower nut creates a slight gap between the upper nut and the flexible portion.Tightening and tightening the fixing screw causes the flexible portion to flex. By bending, the upper and lower nuts are elastically attracted toward each other, and the nuts are strongly pressed against the bolts to prevent loosening.

〔Example〕

The drawings show an embodiment of the present invention. The nut of the present invention is composed of a circular upper nut (1), a lower nut (2), and a fixing screw (3).

As shown in FIG. 1 to FIG. 3, the upper nut (1) has three insertion holes (4) (4) (4) and three bottomed holes (5) (5) (5) at the peripheral portion thereof. )
Are drilled on the same circumference. A pair of left and right engaging pieces (6) (6) are provided on both ends of the lower surface of the upper nut (1) so as to hang down in parallel with the axis and parallel to each other.

As shown in FIGS. 4 to 6, in the lower nut (2) having the same diameter as the upper nut (1), a screw hole (7) is formed at a position corresponding to each of the insertion holes (4). Similarly, a pair of left and right bottomed holes (8) (8) facing the centripetal direction are also formed on the side surface.

A projecting ring (9), which is parallel to the axis and projects slightly upward, is provided on the peripheral portion of the upper surface of the lower nut (2).

On both sides of the lower nut (2), a pair of left and right notches (10) (10) which are parallel to each other and into which the upper protrusions (6) (6) can be fitted are cut out.

An annular groove (11) coaxial with the axis is cut from the outer peripheral surface near the upper surface of the lower nut (2), and a thin flexible portion (12) is formed between the annular groove (11) and the upper surface.

As shown in Fig. 7 and Fig. 8, engage both engaging pieces (6) (6) of the upper nut (1) with both notches (10) (10) of the lower nut (2) and insert each The fixing screw (3) inserted into the hole (4) is slightly screwed into the screw hole (7), and the upper and lower nuts (1) and (2) that are overlapped
Is screwed into the bolt (13), and the lower nut (2) is tightened to the contacted surface (14) using the bottomed hole (5) or (8).

Then, by tightening the fixing screw (3), a gap (15) is formed between the flexible part (12) and the upper nut (1), so that the protruding ring (9) of the lower nut (2) , The flexible part (12) elastically bends, the upper and lower nuts (1) and (2) are pulled together, and the bolt (13)
Strongly crimps to prevent loosening.

The fixed nut of the present invention, by the operation reverse to the above,
It can be easily removed from the bolt (3).

[Effect of device]

In the nut of the present invention, when the fixing screw is tightened, the flexible portion of the lower nut elastically bends, and the upper and lower nuts are elastically attracted and pressed against the bolt, so there is no risk of loosening due to external force such as vibration.

Further, if necessary, it can be fixed to the middle of the bolt so as not to be rotatable.

[Brief description of drawings]

1 is a plan view of an upper nut, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG. 1, and FIG. 4 is a lower nut. FIG. 5, FIG. 5 is a sectional view taken along the line CC of FIG. 4, FIG. 6 is a sectional view taken along the line DD of FIG. 4, and FIG. 7 is a nut of the present invention screwed into a bolt. 2 is a sectional view similar to FIG. 2 and FIG. 5 above, and FIG. 8 is a sectional view similar to FIG. 3 and FIG. (1) Upper nut, (2) Lower nut (3) Fixing screw, (4) Insertion hole (5) Bottom hole, (6) Engaging piece (7) Screw hole, (8) Bottom hole (9) Projection ring, (10) Notch (11) Annular groove, (12) Flexible part (13) Bolt, (14) Abutted surface (15) Gap

Claims (1)

[Scope of utility model registration request] 1. An appropriate number of insertion holes and bottomed holes are formed in the peripheral portion,
In addition, on both sides of the lower surface, upper nuts with protruding engaging pieces that project parallel to the axis are provided, and screw holes are drilled at the locations corresponding to the insertion holes of the upper nuts. A number of bottomed holes are provided, and a protrusion ring that protrudes parallel to the axis and can abut against the lower surface of the upper nut, and a notch with which the engaging piece of the upper nut can engage are provided in the peripheral portion of the upper surface. Further, an annular groove is cut near the upper surface, and this annular groove is inserted into the lower nut that forms a thin flexible portion between the upper surface and the upper nut, and the insertion hole in the upper nut. A loosening prevention nut consisting of a fixing screw that can be fitted.