JP2009299704A - Nut looseness preventive clip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clip capable of easily, quickly and surely preventing looseness of a nut, by being installed on a bolt above the nut. <P>SOLUTION: A locking part 3 projected inward in the radial direction more than an inner peripheral surface of a clamp part 2, is arranged in the ring-shaped clamp part 2 crossing with both end parts, and the locking part 3 is engaged with a screw groove of the bolt 6 when installing the clamp part 2 on the bolt 6. Knob parts 4 and 5 are arranged on both ends of the clamp part 2. The clamp part 2 is expanded and installed on the bolt by bringing these knob parts 4 and 5 close to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a nut locking clip that is attached to a bolt for locking a nut.

  The inventor of the present application is also an inventor of typical locking nuts such as a U nut and a hard lock nut (registered trademark). Since the U nut is a single nut, it is highly convenient, but it cannot exert a sufficient locking action. On the other hand, the hard lock nut can perform extremely strong loosening prevention by the wedge effect of the upper and lower nuts that are fitted with eccentric unevenness, but has the disadvantage that the construction is complicated and the weight is increased.

While there is a demand for a single nut that can exert a large locking function and can withstand repeated use, the present inventor has developed, manufactured and sold the locking nut described in Patent Document 1. is doing.
JP-A-10-286649

  Although the locking nut described in Patent Document 1 is also highly practical, the nut overall height is relatively high due to the presence of the frustoconical caulking portion at the top of the hexagonal nut, so that it can be mounted in a narrow place. In addition to being unsatisfactory, it is a kind of pre-leveling torque nut in which torque is generated from the initial stage of screwing to the bolt, and therefore, it takes time to fasten the nut.

  Therefore, an object of the present invention is to provide a nut loosening prevention clip that can easily and quickly prevent a nut from loosening by being attached to a bolt above the nut.

  In order to achieve the above object, the present invention takes the following technical means.

  That is, the present invention is a nut loosening clip that is attached to a bolt above the nut in order to prevent the nut attached to the bolt from being loosened. A first operation portion provided at one end of the clamp portion and a second operation portion provided at the other end of the clamp portion, wherein the inner diameter of the clamp portion is smaller than the outer diameter of the bolt, and the first and second operations The clamp portion is made of an elastic material so that the inner diameter of the clamp portion can be made larger than the outer diameter of the bolt by bringing the portions closer to each other.

  According to the present invention, after the nut is fastened to the bolt, the clip portion is externally fitted to the bolt shaft portion above the nut, and the bolt shaft portion is tightened by the clamp portion, so that the clip is clipped at a predetermined position in the axial direction of the bolt shaft. Is fixed, and the lower end of the clip abuts on the top surface of the nut, thereby preventing the nut from loosening. Further, the clip can be easily attached to and detached from the bolt shaft by operating the first and second operation portions.

  The clip of the present invention may further include a locking portion that protrudes radially inward from the inner peripheral surface of the clamp portion. The engaging portion engages with the screw groove of the bolt to prevent the clip from moving upward in the axial direction (that is, the nut loosening direction) with respect to the bolt shaft, and more reliably prevent the nut from loosening. it can.

  Moreover, the said latching | locking part may protrude toward the nut loosening direction from a clamp part so that a clamp part may rotate with respect to a volt | bolt in the direction which a nut loosens. According to this, when the clamp portion tries to rotate together with the nut in the loosening direction, the locking portion acts so as to bite into the thread groove, and such rotation is prevented, so that the nut can be more reliably prevented from loosening.

  In addition, the locking portion may be provided in the clamp portion at a position closer to the nut loosening direction than the center portion in the circumferential direction of the clamp portion, or on the opposite side of the nut loosening direction from the circumferential center portion of the clamp portion. You may provide in a clamp part in a position. Moreover, the latching | locking part may be provided in the circumferential direction multiple places, and may be provided only in the circumferential direction one place.

  Moreover, the said latching | locking part can be provided in the lower end part of a clamp part. According to this, since the engaging portion is sandwiched between the nut upper end portion and the screw thread of the bolt, the engaging portion is firmly locked at that position, and the loosening of the nut can be prevented more reliably.

  The clamp part may be formed by deforming a strip made of spring steel into a ring shape. According to this, it can manufacture cheaply and easily. Further, the first and second operation parts can be constituted by knob parts protruding radially outward from both circumferential ends of the clamp part. According to this, it is possible to easily and quickly pinch with fingers. The diameter expansion operation of a clamp part can be performed.

  According to the present invention, it is possible to easily and quickly prevent the nut from being loosened by attaching the clip to the bolt above the nut.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show a nut locking clip 1 according to an embodiment of the present invention, and the clip 1 is a clamp part 2 formed by deforming a strip made of spring steel into a ring shape intersecting at both ends. The locking portion 3 protruding from the clamp portion 2 so as to protrude radially inward from the inner peripheral surface of the clamp portion 2, and the first knob portion 4 provided at one end in the circumferential direction of the clamp portion 2 (First operation portion) and a second knob portion 5 (second operation portion) provided at the other circumferential end of the clamp portion 2.

  When the external force is not applied to the clamp part 2, the inner diameter of the clamp part 2 is smaller than the outer diameter of the bolt 6, and the inner diameter of the clamp part 2 is increased by bringing the first and second knob parts 4 and 5 closer to each other. The outer diameter of the bolt can be made larger.

  The locking portion 3 engages with the thread groove of the bolt 6 when the clamp portion 2 is attached to the bolt 6. The locking portion 3 is provided at the lower end portion of the clamp portion 2 and is sandwiched between the upper end surface of the nut 7 and the thread of the bolt 6. The locking portion 3 is provided in the clamp portion 2 at a position closer to the nut loosening direction A than the center portion C in the circumferential direction of the clamp portion 2.

  The 1st and 2nd knob parts 4 and 5 consist of a resin molded product, and are respectively attached and fixed to the attachment piece 8 formed by bending the circumferential direction edge part of the clamp part 2 to radial direction outward. The knobs 4 and 5 can also be provided with fluorescence or phosphorescence, thereby making it possible to easily and quickly confirm whether or not the clip 1 is attached to each bolt. This is particularly useful, for example, when the clip 1 of the present invention is applied to a large number of nuts used for fixing a railway track.

  The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, the locking portion may be a hemispherical protrusion provided on the inner peripheral surface of the clamp portion. Further, the clamp part is not limited to a belt-like one, and may be a wire-like one formed by bending. Further, the first and second operation parts can be constituted by tool engagement holes provided at the circumferential end of the clamp part. In this case, the tip of a tool such as pliers is made of the tool engagement hole. The diameter of the clamp can be increased by engaging with the operation portion and the tool can be prevented from being removed due to mischief or the like.

It is a perspective view at the time of use of the nut locking clip which concerns on one Embodiment of this invention. It is an expansion perspective view of the clip. It is a bottom view of the clip.

Claims (6)

  A nut locking clip that is attached to the bolt above the nut to prevent loosening of the nut attached to the bolt, and includes a ring-shaped clamp portion that intersects both ends, and an inner peripheral surface of the clamp portion A locking portion protruding radially inward, a first operation portion provided at one end of the clamp portion, and a second operation portion provided at the other end of the clamp portion. Is smaller than the outer diameter of the bolt, and the clamp portion is made of an elastic material so that the inner diameter of the clamp portion can be made larger than the outer diameter of the bolt by bringing the first and second operating portions closer to each other. A nut locking clip that engages with a screw groove of a bolt.   2. The nut loosening prevention clip according to claim 1, wherein the locking portion protrudes from the clamp portion in the nut loosening direction so as to prevent the clamp portion from rotating with respect to the bolt in the direction in which the nut loosens. A clip for preventing loosening of nuts.   3. The nut loosening prevention clip according to claim 1, wherein the locking portion is provided in the clamp portion at a position closer to the nut loosening direction than the circumferential central portion of the clamp portion. Stop clip.   The nut locking clip according to claim 1, 2, or 3, wherein the locking portion is provided at a lower end portion of the clamp portion.   The nut loosening prevention clip of any one of Claims 1-4 WHEREIN: The said clamp part deform | transforms the strip which consists of spring steel in a ring shape, The nut loosening prevention clip characterized by the above-mentioned.   The nut loosening prevention clip according to any one of claims 1 to 5, wherein the first and second operation parts are formed of a knob part protruding radially outward from both circumferential ends of the clamp part. Nut locking clip.

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