JP2006242206A - Fastening member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening member comprising a bolt, a nut, and a washer which are free of looseness with unexpected force such as vibration. <P>SOLUTION: The fastening member comprises the bolt 10, the nut 20, and the washer 30. One or more flat rotation preventive face 12 is formed on the outer peripheral face of a screw portion 11 of the bolt 10. A flat receiving face 31 corresponding to the rotation preventive face 12 is formed on the inner peripheral face of the washer 30, and a plurality of bosses 32 are radially formed on the face thereof in contact with the nut 20. A plurality of protruded portions 21 are radially formed on the face of the nut 20 in contact with the washer 30 so that at least one protruded portion 21 engages with at least boss 32 of the washer 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fastening member that is composed of bolts, nuts, and washers and has an excellent locking effect.

For example, so-called fastening members made up of bolts, nuts, and washers are used as means for assembling a material to be fastened such as two plates.
This fastening member has the advantage that the material to be fastened can be easily assembled firmly by tightening the bolt and nut strongly, but loosening occurs in both due to an unexpected force such as vibration. It also has the problem of end up.

  Conventionally, in order to solve such a problem, there is one in which a plurality of protrusions are formed radially on the surface of the nut that contacts the washer and the looseness is prevented by the frictional resistance of the protrusions.

  However, even in the prior art in which a plurality of protrusions are formed on the nut, there is still a problem that looseness occurs due to an unexpected force such as vibration.

  Then, the place made into the objective of this invention makes it a subject to provide the fastening member comprised from a volt | bolt, a nut, and a washer which does not loosen even if unexpected force, such as a vibration, acts.

  In order to achieve the above object, a fastening member (1) according to claim 1 of the present invention comprises a bolt (10), a nut (20) and a washer (30), wherein the bolt One or a plurality of flat anti-rotation surfaces (12) are formed on the outer peripheral surface of the screw portion (11) of (10), and the anti-rotation surface (12) is formed on the inner peripheral surface of the washer (30). A flat receiving surface (31) having a corresponding shape is formed, and a plurality of protrusions (32) are formed radially on the surface in contact with the nut (20) to contact the washer (30) of the nut (20). A plurality of protrusions (21) are formed radially on the surface, and at least one protrusion (21) is engaged with at least one protrusion (32) of the washer (30).

  The fastening member (1) according to claim 2, wherein the projection (32) of the washer (30) has a vertical surface (P) and an inclined surface (S), and the nut (20). The convex portion (21) also has a vertical surface (P) and an inclined surface (S), and the vertical surface (P) of the projection (32) and the vertical surface (P) of the convex portion (21) are formed. It is characterized by being engaged.

  Furthermore, the fastening member (1) according to claim 3 has a notch (33) in which the protrusion (32) of the washer (30) is formed by notching the outer peripheral end of the washer (30) into an L shape. ) Is formed and formed.

  Furthermore, the fastening member (1) according to claim 4 has a convex portion (21) of the nut (20) and a surface in contact with the washer (30) of the nut (20) in a saw blade shape. It is characterized by being formed.

  Symbols in parentheses indicate corresponding elements or corresponding matters described in the drawings and embodiments of the invention described later.

  According to the fastening member of the first aspect of the present invention, one or a plurality of flat non-rotating surfaces are formed on the outer peripheral surface of the screw portion of the bolt, and the non-rotating surface is formed on the inner peripheral surface of the washer. Since the flat receiving surface of the corresponding shape is formed, the washer is prevented from idling with respect to the bolt by fitting the washer to the bolt so that the receiving surface is matched with the detent surface. Can do.

  In addition, a plurality of protrusions are radially formed on the surface of the washer that contacts the nut, and a plurality of protrusions that engage with the protrusion of the washer are radially formed on the surface of the nut that is in contact with the washer. In the tightened state, the convex portion engages with the protrusion of the washer. In this state, since the washer is fitted to the bolt so as not to idle, the nut assembled by engaging with the washer does not loosen even if an unexpected force such as vibration is applied.

  According to the second aspect of the present invention, in addition to the function and effect of the first aspect of the invention, the projection of the washer has a vertical surface and an inclined surface, and the projection of the nut also has the vertical surface and the inclined surface. Since the vertical surface of the protrusion is engaged with the vertical surface of the convex portion, the engagement between the two is firmly maintained without disengagement. Therefore, the loosening of the nut can be prevented more reliably.

  Since both the washer protrusion and the nut protrusion have an inclined surface, when the nut is tightened and the protrusion comes into contact with the protrusion, the inclined surface of the protrusion gets over while contacting the inclined surface of the protrusion. The nut can be tightened smoothly.

  Further, according to the invention described in claim 3, in addition to the function and effect of the invention described in claims 1 and 2, the washer protrusion is formed by cutting the outer peripheral end of the washer into an L shape. Since the notch is raised and formed, there is no need to provide another member for forming the protrusion. Therefore, it is easy to mold the washer and the manufacturing cost is low.

  Further, when the nut is tightened and the convex portion comes into contact with the projection of the washer, the projection is elastically deformed so that the projection is pushed in, so that the nut is smoothly tightened. When the tightening of the nut is completed, the protrusion is elastically restored and engaged with the convex portion, so that the nut is reliably prevented from loosening.

  Furthermore, according to the invention described in claim 4, in addition to the operational effects of the invention described in claims 1 to 3, the protruding portion of the nut is engraved in a saw blade shape on the surface contacting the washer of the nut. Therefore, it is not necessary to form the convex portion by another member. Therefore, the nut can be easily formed and can be manufactured at a low cost.

  With reference to FIG. 1 thru | or FIG. 8, the fastening member 1 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a side sectional view showing the fastening member 1. FIG. 2 is a perspective view showing the bolt 10 of the fastening member 1. 3 is a side view showing the nut 20 of the fastening member 1, FIG. 4 is a front view, and FIG. 5 is a cross-sectional view taken along line AA in FIG. 6 is a front view showing the washer 30 of the fastening member 1, FIG. 7 is a view taken in the direction of the arrow B in FIG. 6, and FIG. 8 is a side view of the washer 30.

  The fastening member 1 according to the embodiment of the present invention includes a bolt 10, a nut 20, and a washer 30. A spring washer 40 is fitted between the bolt 10 and the material to be fastened 50.

  In the present embodiment, two flat non-rotating surfaces 12 are formed on the outer peripheral surface of the screw portion 11 of the bolt 10 so as to face each other as shown in FIG. Further, as shown in FIG. 6, two flat receiving surfaces 31 each having a shape corresponding to each of the two detent surfaces 12 of the bolt 10 are formed on the inner peripheral surface of the washer 30.

  Further, a plurality of protrusions 32 are formed radially on the surface of the washer 30 that contacts the nut 20. The protrusion 32 is formed by raising a notch 33 formed by cutting the outer peripheral end of the washer 30 into an L shape toward the nut 20, and has a vertical surface P and an inclined surface S.

  Further, as shown in FIGS. 3 to 5, a plurality of convex portions 21 that engage with the protrusions 32 of the washer 30 are formed radially on the surface of the nut 20 that contacts the washer 30. The convex portion 21 is formed by cutting a surface of the nut 20 in contact with the washer 30 in a saw blade shape, and has a vertical surface P and an inclined surface S. The vertical surface P of the convex portion 21 is engaged with the vertical surface P of the protrusion 32 of the washer 30 with the nut 20 tightened.

  For example, when two plate-like materials to be fastened 50 are fixed by the fastening member 1, as shown in FIG. 1, the washer 30 is fitted into the screw portion 11 of the bolt 10 inserted through the insertion hole of the material to be fastened 50. At that time, as shown in FIG. 9, the receiving surface 31 of the washer 30 is aligned with the rotation stop of the screw portion 11. As a result, the washer 30 is prevented from idling with respect to the bolt 10.

  Next, when the nut 20 is screwed into the screw portion 11 and tightened, the convex portion 21 of the nut 20 is engaged with the protrusion 32 of the washer 30 and assembled. In this state, since the washer 30 is assembled to the bolt 10 so as not to idle, the nut 20 is firmly assembled to the screw portion 11 of the bolt 10 without being loosened.

  In the present embodiment, as shown in FIG. 10, the vertical surface P formed on the convex portion 21 of the nut 20 is engaged with the vertical surface P formed on the protrusion 32 of the washer 30. The combined state is maintained firmly, and the loosening of the nut 20 is further reliably prevented.

  Further, when the nut 20 is tightened, in a state where the convex portion 21 of the nut 20 starts to contact the projection 32 of the washer 30, the inclined surface S of the convex portion 21 is inclined to the inclined surface S of the projection 32 as shown in FIG. Therefore, the convex portion 21 can easily get over the projection 32. Therefore, the nut 20 can be smoothly tightened.

  Furthermore, in the present embodiment, the protrusion 32 of the washer 30 is formed by raising the notch 33 formed by notching the outer peripheral end portion thereof. When it comes into contact, it is elastically deformed so as to be pushed in, and when the tightening of the nut 20 is completed, it returns to its original state. Therefore, the nut 20 can be tightened smoothly and firmly.

In the fastening member 1 according to the present embodiment, five protrusions 32 of the washer 30 are provided by dividing the circumference of the washer 30 into five equal parts, and the convex portion 21 of the nut 20 is provided with 24 inner diameters of the nut 20. However, the present invention is not limited to this, and it may be provided in a configuration in which at least one protrusion 32 and at least one convex portion 21 are smoothly engaged.
In addition, although the anti-rotation surface 12 and the two receiving surfaces 31 corresponding to the anti-rotation surface 12 are formed, the present invention is not limited to this, and one or more may be formed.

It is a sectional side view which shows the fastening member which concerns on embodiment of this invention. It is a perspective view which shows the volt | bolt of the fastening member of FIG. It is a side view which shows the nut of the fastening member of FIG. It is a front view which shows the nut of the fastening member of FIG. It is the sectional view on the AA line of FIG. It is a front view which shows the washer of the fastening member of FIG. It is a B line arrow directional view of FIG. It is a side view of the washer shown in FIG. In embodiment of this invention, it is a front view which shows the state which fitted the washer in the thread part of the volt | bolt. In embodiment of this invention, it is a partially expanded side view which shows the engagement state of the convex part of a nut, and protrusion of a washer. In embodiment of this invention, it is a partially expanded side view which shows the state in which the convex part of a nut gets over the processus | protrusion of a washer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fastening member 10 Bolt 11 Screw part 12 Anti-rotation surface 20 Nut 21 Protruding part 30 Washer 31 Receiving surface 32 Protrusion 33 Notch part 40 Spring washer 50 Fastening material P Vertical surface S Inclined surface

Claims (4)

A fastening member composed of a bolt, a nut and a washer,
On the outer peripheral surface of the screw portion of the bolt, one or a plurality of flat detent surfaces are formed,
On the inner peripheral surface of the washer, a flat receiving surface having a shape corresponding to the anti-rotation surface is formed, and a plurality of protrusions are radially formed on the surface in contact with the nut,
A fastening member, wherein a plurality of convex portions are formed radially on a surface of the nut in contact with the washer, and at least one convex portion is engaged with at least one projection of the washer. The projection of the washer has a vertical surface and an inclined surface, and the convex portion of the nut also has a vertical surface and an inclined surface.
The fastening member according to claim 1, wherein the vertical surface of the protrusion is engaged with the vertical surface of the convex portion.   The fastening member according to claim 1 or 2, wherein the protrusion of the washer is formed by raising a notch formed by cutting an outer peripheral end of the washer into an L shape.   The fastening member according to claim 1, 2 or 3, wherein the convex portion of the nut is formed by cutting a surface of the nut in contact with the washer in a saw blade shape.

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