JP2015163804A - male screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an epoch-making male screw having an extremely high commercial value.SOLUTION: In a male screw 1 for being screwed into a female screw 20, a bottomed small female screw 2 is provided in the lengthwise direction of the shaft center of the male screw 1, and a slave male screw 10 is screwed into the small female screw 2. The male screw 1 is provided with a slit 3 which is orthogonal to the shaft center direction, which is set deep enough to reach the small female screw 2 and which has a predetermined peripheral length. In the small female screw 2 and the slave male screw 10, a part from the bottom of the small female screw 2 to the slit 3 is configured as a non-screwing part.

Description

  The present invention relates to a male screw such as a bolt or a screw.

  Conventionally, various male screws (hereinafter referred to as conventional examples) disclosed in, for example, Japanese Patent Application Laid-Open No. 6-42522 have been proposed as male screws having a locking function to be screwed into a female screw.

  In this conventional example, a slit having a predetermined length is formed in the axial direction from the tip, and the diameter thereof is set to be slightly larger than the diameter of the female screw. After the screwing is completed, a diameter expanding action is generated by the restoring force, and the loosening prevention function is exhibited by pressing the female screw. Further, in the conventional example, an elastic member is fitted into the slit, and the diameter-enlarging action is caused by the elastic biasing of the elastic member.

JP-A-6-42522

  As a result of further research and development on the male screw having the above-described locking function, the present inventor has developed an innovative male screw with extremely high commercial value.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A male screw 1 is screwed into a female screw 20, and a small female screw 2 having a bottom is provided in the axial direction of the male screw 1. A small male screw 10 is provided in the small female screw 2. The male screw 1 is provided with a slit 3 having a predetermined circumferential length at a depth perpendicular to the axial direction and reaching the small female screw 2. The small female screw 2, the male male screw 10, Is a male screw characterized in that a portion from the bottom of the small female screw 2 to the slit 3 is formed as a non-threaded portion.

  The male screw according to claim 1, wherein a plurality of the slits 3 are arranged in parallel, and the slit 3 located farthest from the bottom of the small female screw 2 is configured as the non-threaded portion. The present invention relates to a male screw characterized by that.

  3. The male screw according to claim 2, wherein each of the slits 3 is provided with a different phase.

  The male screw according to any one of claims 1 to 3, wherein the axis of the male screw 1 and the axis of the child male screw 10 coincide with each other. It is.

  Since the present invention is configured as described above, the present invention provides an epoch-making male screw with extremely high commercial value, such as exhibiting an excellent anti-loosening function that has not been achieved in the past.

It is a disassembled perspective view which shows a present Example. It is explanatory sectional drawing which shows a present Example. It is operation | movement explanatory sectional drawing of the principal part of a present Example. It is use condition explanatory drawing of a present Example. It is use condition explanatory drawing of a present Example.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  When the child male screw 10 is screwed into the small female screw 2 of the male screw 1 according to the present invention, the base end side portion (the screwed portion between the small female screw 2 and the child male screw 10) is located at the distal end side portion. Separates from (non-threaded portion between the small female screw 2 and the male screw 10).

  Therefore, when the male screw 1 is screwed onto the small female screw 2 in a state where the male screw 1 is screwed onto the female screw 20, the base end side portion of the small female screw 2 (the small female screw 2 and the male male screw 10 is connected). Since the threaded portion is moved in the direction of separation and the portion is pressed against the female screw 20, the function of preventing the loosening of the male screw 1 with respect to the female screw 20 is exhibited. The threaded portion of the female screw 2 and the male male screw 10) also exerts a return bias due to the spring property and presses against the male male screw 10, so that the function of preventing the male male screw 10 from loosening against the male screw 1 is also exhibited. The

  As described above, the present invention exhibits the function of preventing the loosening of the male screw 1 with respect to the female screw 20 and the function of preventing the loosening of the child male screw 10 with respect to the male screw 1. No. 1 slack prevention function is exhibited.

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

  The present embodiment is a male screw 1 screwed into a female screw 20 (screw hole) formed on an appropriate member 21, and a small female screw having a bottom in the axial direction of the male screw 1. 2 (screw hole) is provided, and a small male screw 10 is screwed into the small female screw 2. Reference numeral 20a denotes a thread groove.

  In addition, although a present Example is a screw (what is called a set screw) used for the connection structure of an artificial leg, of course, it is not restricted to this.

  Hereinafter, each component according to the present embodiment will be described.

  The male screw 1 is a rod-like body formed of an appropriate metal member (spring steel: SUP material) as shown in FIGS. 1 and 2 and set to a diameter that is screwed into the screw hole 21 of the female screw 20. An outer thread groove 1a is formed on the outer surface. The male screw 1 and the child male screw 10 described later may be made of synthetic resin.

  Further, the axis of the male screw 1 and the axis of a child male screw 10 described later are configured to coincide with each other.

  Further, the male screw 1 is provided with a bottomed hole in the axial length direction of the male screw 1, and an inner screw groove 2 a is formed on the inner surface of the bottomed hole to constitute a small female screw 2. Yes.

  Specifically, the small female screw 2 includes a large-diameter hole portion 2A that opens to one end of the male screw 1, and a small-diameter hole portion 2B that is continuous with the distal end side of the large-diameter hole portion 2A. The inner screw groove 2a is formed only in the large-diameter hole portion 2A, and the inner screw groove 2a is not formed in the small-diameter hole portion 2B. The small female screw 2 and a child male screw 10 described later are: A portion from the bottom of the small female screw 2 to a slit 3 described later is formed as a non-threaded portion.

  Further, the bottom of the small female screw 2 serves as a contact surface 2b with which the tip 10b of the screwed male screw 10 contacts.

  A slit 3 is provided at a predetermined position of the male screw 1.

  As shown in FIGS. 1 and 2, the slit 3 is a slit 3 having a predetermined circumferential length that is perpendicular to the axial direction of the male screw 1 and reaches the small female screw 2. In this embodiment, the slit 3 Are arranged in parallel in the length direction of the male screw 1, and each slit 3 is provided with a different phase (phase shifted by 180 degrees).

  The number of slits 3 may be one or three or more. In the case of a plurality of slits 3, the phase difference of each slit 3 is not limited to 180 degrees, and may be 90 degrees, for example, in the axial direction of the male screw 1. The slits 3 arranged side by side may have a configuration in which phases are spirally different from each other by a predetermined angle.

  Further, in this embodiment, the non-threaded portion is formed up to the slit 3 which is the farthest from the bottom of the small female screw 2.

  Reference numeral 1b is a recess for fitting and connecting a rotating tool for rotating the screw member 1.

  The male male screw 10 is a rod-shaped body formed of an appropriate metal member as shown in FIGS. 1 and 2, and is composed of a large-diameter portion and a small-diameter portion connected to the tip side of the large-diameter portion. Has been.

  Specifically, a screw groove 10a is formed on the outer surface of the large-diameter portion, and no screw groove 10a is formed in the small-diameter portion, and the small female screw 2 (large-diameter hole portion 2A) of the male screw 1 is formed. It is configured so that it can be screwed together.

  Further, a square hole 10c into which a square wrench is fitted is formed at the end of the large diameter portion, and the child male screw 10 can be screwed with respect to the male screw 1 using the square wrench.

  Since the present embodiment is configured as described above, when the child male screw 10 is screwed into the small female screw 2 of the male screw 1, the base end side portion (the small female screw 2 and the male male screw 10 is connected to the slit 3). 3 is separated in the direction of arrow a in FIG. 3 with respect to the distal end side portion (the non-screwed portion between the small female screw 2 and the male screw 10).

  Therefore, when the male screw 1 is screwed onto the small female screw 2 in a state where the male screw 1 is screwed onto the female screw 20, the base end side portion of the small female screw 2 (the small female screw 2 and the male male screw 10 is connected). Since the threaded portion is moved in the direction of separation and the portion is pressed against the female screw 20, the function of preventing the loosening of the male screw 1 with respect to the female screw 20 is exhibited. The threaded portion of the female screw 2 and the male male screw 10) also exerts a return bias in the direction of arrow b in FIG. Ten anti-loosening functions are also demonstrated.

  As described above, the present invention exhibits the function of preventing the loosening of the male screw 1 with respect to the female screw 20 and the function of preventing the loosening of the child male screw 10 with respect to the male screw 1. No. 1 slack prevention function is exhibited.

  Therefore, according to the present embodiment, the present embodiment exhibits the function of preventing the loosening of the male screw 1 with respect to the female screw 20 by screwing the child male screw 10 with the male screw 1 screwed with the female screw 20. In addition, the function of preventing the loosening of the male screw 10 with respect to the male screw 1 is also exhibited, so that the function of preventing the loosening of the male screw 1 screwed into the female screw 20 is more reliably exhibited.

  Further, in this embodiment, a plurality of slits 3 are arranged in parallel in the axial length direction of the male screw 1, and each slit 3 is provided in a different phase. The side portion (the screwed portion between the small female screw 2 and the child male screw 10) surely moves in the separating direction (the direction of arrow a in FIG. 3).

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

1 Male screw 2 Small female screw 3 Slit
10 Child male screw
20 Female thread

Claims (4)

  A male screw to be screwed into the female screw, and a small female screw with a bottom is provided in the axial length direction of the male screw, and a child male screw is screwed into the small female screw. The screw is provided with a slit having a predetermined circumferential length that is perpendicular to the axial direction and reaches the small female screw, and the small female screw and the child male screw are formed from the bottom of the small female screw to the slit. A male screw characterized in that the non-threaded portion is configured up to.   2. The male screw according to claim 1, wherein a plurality of the slits are arranged side by side, and the slit farthest from the bottom of the small female screw is formed in the non-threaded portion. Male thread.   3. The male screw according to claim 2, wherein the slits are provided in different phases.   The male screw according to any one of claims 1 to 3, wherein an axis of the male screw is coincident with an axis of the child male screw.

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