Displacement regulation member and engagement member

Abstract

The present invention provides a means for regulating, with a simple structure, the displacement of a target member in a prescribed direction.　A displacement regulation member according to the present invention comprises: a base section secured to a first member; an opening, provided in the base section, through which a second member can be inserted; and a protruding section with an engaging piece protruding toward the shaft center from the edge of the opening, wherein the protruding section includes a first protruding section in which the engaging piece is made to protrude at a first position where the engaging piece is in proximity to the base section and a second protruding section in which the engaging piece is made to protrude at a second position farther away from the base section than the first position, and the engagement of the engaging piece with the second member regulates potential relative displacement of the first member and the second member in the prescribed direction.

Description

Displacement restriction member and engagement member

[0001] The present invention relates to a displacement restricting member and an engaging member.

[0002] Conventionally, there are applications for screws consisting of a combination of a bolt and a nut that require the nut threaded onto the bolt to not loosen. A type of screw designed to meet such applications is called a locking nut. This is a nut that is designed to make it difficult for the nut threaded onto the bolt to loosen. Conventional locking nuts are classified into so-called single-nut types, which are designed to provide the locking effect with one nut, and so-called double-nut types, which provide the locking effect with a combination of two nuts.

[0003] A common single-nut locking nut is known to have a mechanism built into the nut that functions like a washer (see, for example, Patent Document 1). This type of locking nut prevents loosening by applying a frictional force to the surface of the bolt threads, which is achieved by an elastic member provided in the nut body biasing the bolt that is threaded onto the nut body.

[0004] Furthermore, a typical double-nut type anti-loosening nut is known that is composed of a first nut with a reduced diameter end configured to be expandable and contractible, and a second nut that screws onto the outer periphery of the reduced diameter end of the first nut to reduce the diameter of the reduced diameter end, with the second nut screwed onto the first nut with its reduced diameter end facing backward in the direction of travel of the bolt, and the reduced diameter end of the first nut is reduced in diameter so that its inner surface is firmly pressed against the spiral groove of the bolt, thereby preventing the nut from loosening (see, for example, Patent Document 2).

[0005] Patent No. 3946752 Registered Utility Model No. 3018706

[0006] The locking nut described in Patent Document 1 mentioned above is somewhat effective in preventing loosening, but it simply tightens the engagement between the bolt and the nut by having an elastic member abut against the leading flank that forms the valley between the threads of the bolt in one of the spiral grooves on the outer surface of the bolt. This does not essentially prevent the nut from loosening, and there is a problem that it can gradually loosen due to vibration, etc.

[0007] Furthermore, the double-nut type anti-loosening nut described in Patent Document 2 reduces the diameter of the reduced diameter end of a first nut with a second nut, and as a result is similar to the single-nut type, in that the inner peripheral surface with irregularities at the reduced diameter end is pressed against one of the spiral grooves on the outer peripheral surface of the bolt, tightening the engagement between the bolt and nut and preventing loosening by the frictional force between the outer peripheral surface of the bolt and the inner peripheral surface of the nut, and there is the problem that the nut will gradually loosen due to vibration, etc.

[0008] The present invention was made through intensive research by the inventor in consideration of the above problems, and aims to provide a means for restricting displacement of a target member in a predetermined direction with a simple structure.

[0009] The displacement-regulating member of the present invention comprises a base fixed to a first member, an opening provided in the base through which a second member can be inserted, and a protrusion having an engaging piece that protrudes toward the axis beyond the edge of the opening, wherein the protrusion includes a first protrusion that causes the engaging piece to protrude at a first position where the engaging piece is close to the base, and a second protrusion that causes the engaging piece to protrude at a second position that is farther away from the base than the first position, and is characterized in that the engaging piece engages the second member, thereby restricting relative displacement between the first member and the second member in a predetermined direction.

[0010] In addition, the displacement restricting member of the present invention is characterized in that the first protruding portion and the second protruding portion face each other across the axis of the opening.

[0011] In addition, the displacement restricting member of the present invention is characterized in that the protrusion includes a plurality of either or both of the first protrusion and the second protrusion.

[0012] The displacement restricting member of the present invention is characterized in that the first protruding portions and the second protruding portions are alternately arranged at substantially equal intervals along the circumferential direction.

[0013] Furthermore, the displacement control member of the present invention is characterized in that the protrusion includes one or more pairs of the first protrusion and the second protrusion, and the tips of the engaging pieces of the first protrusion and the second protrusion that make up the pair can overlap on the trajectory of a virtual spiral structure.

[0014] In addition, the displacement restricting member of the present invention is characterized in that the base portion is detachable from the first member.

[0015] Furthermore, the displacement control member of the present invention is characterized in that the first member is a female-threaded body having a female-thread spiral structure in which an appropriate lead angle and / or lead direction is set, and the shape formed by the tip of the engaging piece forms part of an approximately spiral structure having a lead angle and / or lead direction different from the female-thread spiral structure.

[0016] Furthermore, the engaging member of the present invention is an engaging member having a hole through which a separate inserting member can be inserted, and a displacement control member is arranged so that it cannot be displaced relatively in the circumferential direction, and the displacement control member is characterized in having a first protruding portion that protrudes an engaging piece toward the axis at a first position close to the edge of the opening, and a second protruding portion that protrudes the engaging piece at a second position that is farther away from the edge than the first position.

[0017] According to the present invention, it is possible to restrict the displacement of a target member in a predetermined direction with a simple structure.

[0018] 1 is a perspective view showing a displacement restricting member according to the present embodiment. (a) shows a displacement restricting member, (b) is a side view. (a) shows a displacement restricting member, (b) is an A-A cross-sectional view, and (c) is a B-B cross-sectional view. (b) shows a female-threaded body having a displacement restricting member. (b) shows a male-threaded body, (a) is a front view, and (b) is a plan view. (c) shows a displacement restricting member engaged with a male-threaded body displaced in the tightening direction and elastically deforming. (c) shows a displacement restricting member engaged with a male-threaded body. (d) shows another example of a displacement restricting member. (e) shows a female-threaded body into which a displacement restricting member is fitted. (f) shows a displacement restricting member, a female-threaded body, and a pressing member. (f) shows a female-threaded body to which a pressing member is fixed. (e) shows another example of a displacement restricting member, (a) is a perspective view, and (b) is a side view. (e) shows another example of a displacement restricting member, (a) is a plan view, (b) is an A-A cross-sectional view, and (c) is a partially enlarged view of the A-A cross-section. (f) shows another example of a slit portion end of a displacement restricting member. 10A and 10B are diagrams illustrating other examples of the range of the slit portion of the displacement restricting member.

[0019] An embodiment of a displacement restricting member of the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view showing an internally threaded body 20 including a displacement restricting member 1 of this embodiment. The displacement restricting member 1 of the present invention is integrally attached to the internally threaded body 20 (first member) and prevents the externally threaded body 100 (second member) that is threadedly engaged with the internally threaded body 20 from rotating relative to the internally threaded body 20 in the loosening direction. The displacement restricting member 1 can be fixed to the internally threaded body 20 by any suitable method, and can be disposed using various methods such as adhesive bonding, welding, crimping, insertion, or fitting.

[0020] The dimensions, materials, shapes, and relative arrangements of components described as embodiments or shown in the drawings are merely illustrative and are not intended to limit the scope of the present invention. For example, expressions expressing relative or unambiguous arrangements, such as "in a certain direction," "along a certain direction," "toward a certain direction," "parallel," "orthogonal," "vertical," "center," "concentric," or "coaxial," not only strictly express such arrangements, but also express relative displacements with a tolerance or angle or distance to the extent that the same function is achieved. For example, expressions expressing the equality of things, such as "same," "equal," "uniform," and "equal density," not only express strict equality, but also express tolerances or differences or ratios to the extent that the same function is achieved. For example, expressions expressing shapes such as a triangular pyramid, cone, triangular prism, and cylinder not only express shapes such as a triangular pyramid, cone, triangular prism, and cylinder in the strict geometric sense, but also express shapes including concave and convex portions, chamfered portions, curved portions, rounded portions, etc., to the extent that the same effect is achieved. On the other hand, the expressions "comprise," "formed," "include," "have," "includes," or "have" of one element are not exclusive expressions that exclude the presence of other elements.

[0021] 2A and 2B show the displacement restriction member 1, with (a) being a perspective view and (b) being a side view. The displacement restriction member 1 includes a flange portion (base) 2, an engagement portion 10, etc. The flange portion 2 is generally annular (ring-shaped) and includes a seating surface that can come into surface contact with the end face of the female-threaded body 20, an insertion hole 4 through which the male-threaded body 100 can be inserted, etc., and is wider radially outward than the engagement portion 10.

[0022] The insertion hole 4 is a hole surrounded by the flange portion 2, communicates with the female threaded hole of the female threaded body 20, and is set to a size that does not interfere with the male threaded body 100, i.e., the inner diameter is set to a size equal to or larger than the outer diameter of the male threaded body 100.

[0023] The engaging portion 10 is fixed to the flange portion 2 and has an annular edge portion 10a surrounding the insertion hole 4, and a first protruding portion 12 and a second protruding portion 14 provided on the edge portion 10a and spaced apart in the circumferential direction by slit portions 10b. The first protruding portion 12 and the second protruding portion 14 each have erected portions 12a, 14a rising from the edge portion 10a in the axial direction, and an engaging piece 16 protruding toward the axial center beyond the edge portion 10a.

[0024] The standing portions 12a, 14a have different axial lengths, with the standing portion 14a being set to have a longer axial length than the standing portion 12a. That is, the length of the standing portion 12a of the first protruding portion 12 is set so that the engagement piece 16 protrudes at a first position close to the flange portion 2. The length of the standing portion 14a of the second protruding portion 14 is set so that the engagement piece 16 protrudes at a second position that is farther away from the flange portion 2 in the axial direction than the first position.

[0025] Furthermore, the lengths of the erected portions 12a are the same, and similarly, the lengths of the erected portions 14a are the same.

[0026] The upright portions 12 a, 14 a are designed so that their overall lengths can vary along the circumferential direction. Therefore, the ends of the upright portions 12 a, 14 a are designed so that they can incline in a predetermined direction to form part of a spiral shape with a predetermined lead angle and / or lead direction. Specifically, the ends of the upright portions 12 a, 14 a have an inclined shape that follows the spiral structure of the left-handed thread of the male-threaded body 100, which will be described later.

[0027] 3 shows the displacement restricting member 1, where (a) is a plan view, (b) is an A-A cross-sectional view, and (c) is a B-B cross-sectional view. The engagement piece 16 is connected to the end of each of the upright portions 12a, 14a and protrudes radially inward relative to the upright portions 12a, 14a. Therefore, the engagement piece 16, like the upright portions 12a, 14a, has an inclined shape that slopes along the helical structure of a left-handed screw. That is, the tip of the engagement piece 16 slopes clockwise, gradually moving away from the flange portion 2. The tip of the engagement piece 16 has an abutment portion 16a that abuts on the valleys between the threads 102a of the male-threaded body 100, which will be described later.

[0028] The displacement restricting member 1 is formed, for example, from a thin metal plate, and the engaging pieces 16 and the erected portions 12a, 14a have elasticity, which causes the engaging pieces 16 and / or the erected portions 12a, 14a (including the vicinity of the connection between the erected portions and the edge portions) to bend, and the abutting portions 16a of the engaging pieces 16, which face radially inward, to expand radially outward against the elasticity or to contract due to the restoring force of the elasticity.

[0029] Furthermore, a plurality of first protrusions 12 and second protrusions 14 are provided so as to surround the opening of the insertion hole 4. The number and spacing of the first protrusions 12 and second protrusions 14 can be set as appropriate, and here the first protrusions 12 and second protrusions 14 are alternately arranged at approximately equal intervals with a phase shift of approximately 36° (alternate rows). Therefore, the first protrusions 12 and second protrusions 14 are alternately arranged at 10 locations so as to surround the insertion hole 4.

[0030] Of course, the first protrusions 12 and the second protrusions 14 do not necessarily have to be arranged alternately at a phase pitch of 36°, but can be arranged at any suitable pitch.

[0031] The first protrusions 12 and the second protrusions 14 are alternately arranged at a phase pitch of 36°, so that the first protrusions 12 and the second protrusions 14 are arranged to face each other at positions that are 180° out of phase with each other. That is, the first protrusions 12 and the second protrusions 14 face each other across the axis of the insertion hole 4, and there are five pairs of these in this example.

[0032] The opposing arrangement of the first protrusion 12 and the second protrusion 14 does not necessarily have to be 180° out of phase, but if this is applied to a male-threaded body 100 having two types of male-thread spiral structures formed thereon, which will be described in detail later, it is preferable to configure them to be opposing each other at a 180° phase.

[0033] The first protrusion 12 and the second protrusion 14, which face each other across the axis, are set to form a pair. The shapes, heights, etc. of the paired first protrusion 12 and second protrusion 14 are set so that the engagement pieces 16 of each other overlap on a predetermined spiral trajectory, that is, so that one engagement piece 16 is positioned half a pitch apart from the other engagement piece 16 along the predetermined spiral trajectory.

[0034] Specifically, the engaging pieces 16 of the paired first protrusion 12 and second protrusion 14 are set to overlap on a common imaginary left-handed spiral. That is, if it is assumed that each engaging piece 16 of the first protrusion 12 and the second protrusion 14 extends in the width direction (circumferential direction of the displacement restricting member 1), the shape of the engaging pieces 16 is set to form a left-handed spiral. That is, the tips of the engaging pieces 16 of the paired first protrusion 12 and second protrusion 14 can overlap at positions shifted by half a pitch on the locus of the imaginary spiral structure (left-handed spiral structure).

[0035] 4 is a cross-sectional view showing an internally threaded body 20 equipped with the displacement restricting member 1. The internally threaded body 20 is shaped like a hexagonal nut and has an internally threaded hole 22 at its center. Of course, the external shape of the internally threaded body 20 is not limited to a hexagonal shape, and may be any suitable shape, such as a circle, an ellipse, an oval, a polygonal shape such as a rectangle, a pentagon, or a star, or a shape with a two-face width. The internally threaded hole 22 has a first internally threaded helical structure 24 on its inner circumferential surface, which has a right-hand helical thread that can be threaded onto the externally threaded body 100.

[0036] Furthermore, an engaging portion 26 for installing the displacement restricting member 1 is provided on the end face of the female-threaded body 20. The engaging portion 26 may have a claw shape or the like that surrounds the flange portion 2 of the displacement restricting member 1 radially outward of the flange portion 2 and extends substantially perpendicularly from the end face. In this case, for example, with the displacement restricting member 1 placed on the end face of the female-threaded body 20, the engaging portion 26 is bent radially inward to install the displacement restricting member 1 on the female-threaded body 20. That is, the engaging portion 26 bent radially inward overlaps the flange portion 2 and engages with it in the axial direction. As a result, the flange portion 2 is crimped between the engaging portion 26 and the end face of the female-threaded body 20, and the displacement restricting member 1 is fixedly installed on the female-threaded body 20 so that radial and axial displacements are restricted.

[0037] Next, the male-threaded body 100 will be described. Figure 5 shows the male-threaded body 100, with (a) being a front view and (b) being a plan view. The male-threaded body 100 according to this embodiment is provided with a male-threaded portion 102 in which a male-threaded spiral structure is formed from the base side toward the axial end. The male-threaded body 100 has two types of male-threaded spiral structures formed overlapping each other in the same region: a first male-threaded spiral structure 104 formed as a right-handed thread, and a second male-threaded spiral structure 106 formed as a left-handed thread.

[0038] The male thread portion 102 has approximately crescent-shaped threads 102a extending circumferentially in a surface direction perpendicular to the axis (screw axis) C, which are alternately provided on one side and the other side of the male thread portion 102. By configuring the threads 102a in this manner, two types of helical grooves, a clockwise spiral structure and a counterclockwise spiral structure, can be formed between the threads 102a. Furthermore, the male threaded body 102 can be threadedly engaged with either a right-handed or left-handed female threaded body. For details of the male thread portion 102 having two types of male thread helical structures formed therein, please refer to Japanese Patent No. 4663813, owned by the inventor of the present application.

[0039] The displacement control member 1 has the function of allowing the female threaded body 20 to rotate relative to the male threaded body 100 in the tightening direction, while controlling the female threaded body 20 from rotating relative to the male threaded body 100 in the loosening direction, thereby controlling loosening of the female threaded body 20.

[0040] Specifically, the female-threaded body 20 to which the displacement restricting member 1 is fixed can rotate relative to the male-threaded body 100 in the tightening direction. That is, when torque is applied to the male-threaded body 100 in the tightening direction (clockwise rotation direction) so that the male-threaded body 100 is inserted into the female-threaded hole 22 of the female-threaded body 20, the first male-threaded spiral structure 104 screws into the first female-threaded spiral structure 24. When torque is further applied to the male-threaded body 100 in the tightening direction, the male-threaded body 100 enters the insertion hole 4 of the displacement restricting member 1.

[0041] As the male-threaded body 100 is tightened, the engaging pieces 16 engage with the threads of the male-threaded body 100 and elastically deform to allow the male-threaded body 100 to screw in. Specifically, as shown in Figure 6, when the male-threaded body 100 screws in the direction of arrow a, each engaging piece 16 receives an external force via the threads 102a in a direction rising from the erected portions 12a, 14a and radially outward, causing the engaging pieces 16 and / or the erected portions 12a, 14a to elastically deform.

[0042] At this time, the engaging piece 16 and / or the erected portions 12a, 14a bend, and the abutment portion 16a of the engaging piece 16 facing toward the radial center expands radially outward against elasticity or contracts due to elastic restoring force.

[0043] On the other hand, the displacement restricting member 1 restricts the female-threaded body 20 from rotating in the loosening direction relative to the male-threaded body 100. Specifically, when the male-threaded body 100 is inserted into the insertion hole 4, each engaging piece 16 engages with the male-threaded body 100.

[0044] 7, of the five pairs of engaging pieces 16, the first protruding portion 12 and the second protruding portion 14 of any pair fit into the valley between the threads 102a of the male-threaded body 100. The engaging pieces 16 of the other first protruding portions 12 and second protruding portions 14 come into contact with the slopes of the threads 102a and engage with them.

[0045] In this state, when the male-threaded body 100 attempts to displace relative to the flange 2 in the loosening direction, an external force acts on the engaging pieces 16 via the threads 102a, pressing them toward the flange 2. This external force can deform the engaging pieces 16 radially inward, but cannot deform them radially outward. In other words, it attempts to displace the engaging pieces 16 in a direction that makes it extremely difficult for them to bend.

[0046] Furthermore, because the tip of the engaging piece 16 extends toward the center in the radial direction, when an external force is applied from the male-threaded body 100 displacing in the loosening direction, the engaging piece 16 cannot deform radially outward but tends to deform radially inward. As a result, the engaging piece 16 further clamps the male-threaded body 100, locking it and restricting displacement of the male-threaded body 100 in the loosening direction.

[0047] As the male-threaded body 100 is tightened, the engaging pieces 16 fit into the valleys between the threads 102a, thereby creating a state in which the displacement of the male-threaded body 100 is restricted for each of the five pairs of engaging pieces 16 in sequence.

[0048] As described above, according to the displacement restricting member 1 of this embodiment, a plurality of pairs of engaging pieces 16 are arranged around the male-threaded body 100 with their phases shifted, which makes it possible to create a state in which the engaging pieces are fitted into the valley portions of the male-threaded body 100 regardless of the relative positions of the male-threaded body 100 and the displacement restricting member 1. This allows the displacement restricting member 1 to firmly lock the male-threaded body 100 and restrict relative rotation in the loosening direction with respect to the female-threaded body 20.

[0049] Furthermore, of the engaging pieces 16 of the displacement control member 1, those that are not fitted into the valley portion of the male-threaded body 100 press against the thread 102a of the male-threaded body 100, and the engaging pieces 16 that are pressed by the slope of the thread 102a press against the male-threaded body 100 more firmly, which can also contribute to restricting relative rotation in the loosening direction of the male-threaded body 100.

[0050] Although the description has been given assuming that there are five first protrusions 12 and five second protrusions 14, this is not limited to this, and the number of first protrusions 12 and second protrusions 14 can be set as appropriate. For example, it may be configured with a single first protrusion 12 and multiple second protrusions 14, or multiple first protrusions 12 and a single second protrusion 14, or it may be configured with multiple first protrusions 12 and multiple second protrusions 14, or it may be configured with multiple first protrusions 12 and multiple second protrusions 14.

[0051] Furthermore, in the above embodiment, five pairs of first protrusions 12 and second protrusions 14 are arranged, but the number of pairs of first protrusions 12 and second protrusions 14 is not limited to five pairs, and may be less than five pairs or more than five pairs.

[0052] Furthermore, although the pair of first protrusions 12 and second protrusions 14 has been described as being located opposite each other across the axis of the female screw hole, this is of course not limited to this. For example, it is also possible to set a pair of first protrusions 12 and second protrusions 14 that are adjacent in the circumferential direction.

[0053] Furthermore, although the displacement control member 1 described above is fixed to the female threaded body 20, it does not necessarily have to be fixed and can be provided detachably as long as it is engaged with the female threaded body 20 so that it cannot rotate relative to the female threaded body 20.

[0054] 8, an internally threaded body 120 may be provided that has an insertion groove 122 on one end surface, the insertion groove 122 having an inner diameter larger than the inner diameter of the internally threaded hole 22, and the displacement restriction member 150 may be attached to the internally threaded body 120 by inserting the displacement restriction member 150 into the insertion groove 122. In this case, the displacement restriction member 150 is displaced axially relative to the internally threaded body 120 to remove the displacement restriction member 150 from the internally threaded body 120.

[0055] Specifically, the displacement restricting member 150 may be substantially annular in shape, include the first protruding portion 12 and the second protruding portion 14 described above, and have an outer shape that can fit into the fitting groove portion 122. The displacement restricting member 150 also has one or more recesses 152 formed on its outer circumferential surface.

[0056] On the other hand, the fitting groove portion 122 of the female-threaded body 120 has a bottom portion capable of supporting the displacement restricting member 150, and an inner peripheral convex portion 124 on its inner peripheral surface. The inner peripheral convex portion 124 has a shape capable of fitting into the concave portion 152, and is disposed at a position corresponding to the concave portion 152.

[0057] With such an internally threaded body 120 and displacement restriction member 150, when the displacement restriction member 150 is fitted into the internally threaded body 120, as shown in FIG. 9 , the inner peripheral convex portion 124 of the displacement restriction member 150 is fitted into the concave portion 152, and the displacement restriction member 150 is positioned within the fitting groove portion 122, thereby restricting relative rotation with respect to the internally threaded body 120.

[0058] Furthermore, in order to allow relative displacement in the axial direction, the above-mentioned female-threaded body 120 and the displacement restricting member 150 may have a structure for restricting axial displacement of the displacement restricting member 150 relative to the female-threaded body 120. For example, as shown in Fig. 10 , a retaining member 160 may be fixed to the female-threaded body 120 to sandwich the displacement restricting member 150 between the female-threaded body 120 and the female-threaded body 120. Specifically, a threaded portion 126 is provided on the outer peripheral surface of the female-threaded body 120, and a retaining member 160 that can be threaded onto the threaded portion 126 is provided.

[0059] For example, the retaining member 160 may have a regulating surface 162 that can regulate the axial displacement of the displacement regulating member 150, a through hole 164 through which the male threaded body 100 can be inserted, a screw portion 166 that is provided along the inner surface and can be screwed into the threaded portion 126, and the like.

[0060] By screwing and fixing such a retaining member 160 to the female-threaded body 120, the displacement-regulating member 150 located inside the female-threaded body 120 can be supported by the retaining member 160 so that it cannot be displaced in the axial direction, as shown in FIG. 11 .

[0061] Furthermore, the displacement control member 1 can be formed so that the corners of the engagement piece 16, which is a tongue portion having an approximately trapezoidal shape, are chamfered to make them rounded, or the corners of the abutment portion 16a are chamfered to make them rounded.

[0062] Specific examples are shown in Figures 12 and 13. In the displacement restriction member 201, similar to the displacement restriction member 1, a first protrusion 212 and a second protrusion 214 are arranged at a distance in the circumferential direction by slits 210b on an annular edge 210a erected on the inner peripheral edge of the flange 202 surrounding the insertion hole 204. The first protrusion 212 and the second protrusion 214 each have erected portions 212a, 214a that rise axially from the edge 210a, and an engagement piece 216 that protrudes toward the axis more than the edge 210a.

[0063] The difference between the displacement control member 1 and the displacement control member 201 is that the abutment portion 216a formed at the tip of the engagement piece 216 has both corners in the circumferential direction chamfered and rounded to form an R portion 216b, as shown in Figures 12(a) and 13(a), and the portion that abuts against the thread 102a of the male threaded body 100 and the valley portion between the threads 102a is rounded, as shown in Figure 13(b).

[0064] This makes it possible to prevent the threads from being damaged more than necessary when the engaging piece 216 abuts against the male-threaded body 100 .

[0065] Furthermore, the displacement restriction member 201 differs from the displacement restriction member 1 in that the end of the slit portion 210b on the flange 202 side is rounded, thereby preventing the end of the slit portion 210b from being damaged.

[0066] As a method for processing the ends of the slits, for example, as shown in FIG. 14, the ends of the slits 310B may be processed into an eyelet shape.

[0067] Furthermore, in the displacement restriction members 1, 201, the slits are configured to be formed at the tip of the annular edge portions 10a, 210a erected on the flanges 2, 202, but as shown in Fig. 15(a), they may be formed up to the flange portion 402, or as shown in Fig. 15(b), they may be formed partway up the flange portion 502. In this case, there will be no part of the displacement restriction members 1, 201 corresponding to the edge portions 10a, 210a.

[0068] The engaging piece may also be coated with a resin. This prevents damage to the thread of the mating member with which it abuts, and when the male-threaded body is forcibly rotated in the loosening direction, bending accompanied by plastic deformation occurs in the engaging piece, causing the coating to peel off or crack, leaving evidence that the male-threaded body has been loosened. The coating may be formed on the upright portion, and is not limited to a resin coating, but may also be a glass coating or ceramic coating.

[0069] Furthermore, the direction in which the displacement restricting member is fitted into the female-threaded body is not limited to the axial direction. For example, the female-threaded body may be provided with an insertion portion that can be inserted into the female-threaded body in a direction perpendicular to the axis. That is, the displacement restricting member may be inserted (fitted) into the insertion portion in a direction perpendicular to the axis so as to combine the displacement restricting member with the female-threaded body.

[0070] The insertion portion may be, for example, one that is capable of accommodating the displacement restricting member and has a guide portion or the like provided on the end face of the female-threaded body that guides the flange portion. The insertion portion has an insertion depth that is set so that, when the displacement restricting member is inserted all the way in, the axis of the female-threaded hole coincides with the axis of the insertion hole of the displacement restricting member. It is desirable that the outer shape of the flange of a displacement restricting member that can be inserted into the insertion portion be polygonal, elliptical, oval, or the like, and that it cannot rotate around its axis within the insertion portion.

[0071] An internally threaded body provided with an insertion portion restricts the axial displacement of a displacement-regulating member fitted into the insertion portion, and further allows the displacement-regulating member to be inserted in a direction perpendicular to the axis via the insertion portion and installed so that it can be pulled out. In other words, the displacement-regulating member can be provided in a detachable manner.

[0072] In the above-described embodiment, the displacement-regulating member is disposed so as to be unable to displace relative to the female-threaded body in the circumferential direction, but it goes without saying that the object on which the displacement-regulating member is disposed is not limited to the female-threaded body. For example, the displacement-regulating member may be disposed on an engaging member that engages with an inserting member, such as a male-threaded body or a female-threaded body having a hole through which an inserting member such as a rebar is inserted, or a joint, etc., so as to regulate displacement of the inserting member in a predetermined direction.

[0073] 1,150,201...displacement control member, 2,202,302,402,502...flange portion, 4...insertion hole, 10...engaging portion, 10a...edge portion, 10b,210b,310b,410b,510b...slit portion, 12,212,412,512...first protrusion portion, 14,214,414,514...second protrusion portion, 12a,14a,212a,214a...standing portion, 16,216...engaging piece, 16a...abutment portion, 20,120...female-threaded body, 22...female-threaded hole, 24...first female-threaded spiral structure, 100...male-threaded body, 102...male-threaded portion, 104...first male-threaded spiral structure, 106...second male-threaded spiral structure, 160...retaining member.

Claims

1. A displacement restricting member comprising a base fixed to a first member, an opening provided in the base through which a second member can be inserted, and a protrusion having an engaging piece protruding axially beyond the edge of the opening, wherein the protrusion includes a first protrusion which causes the engaging piece to protrude at a first position where the engaging piece is close to the base, and a second protrusion which causes the engaging piece to protrude at a second position which is farther away from the base than the first position, wherein the engaging piece engages the second member, thereby restricting relative displacement between the first member and the second member in a predetermined direction.

2. The displacement restriction member according to claim 1, wherein the first protrusion and the second protrusion face each other across the axis of the opening.

3. A displacement restriction member according to claim 1, characterized in that the protrusion includes a plurality of either or both of the first protrusions and the second protrusions.

4. A displacement restricting member according to claim 1, characterized in that said first protrusions and said second protrusions are arranged in alternating rows at substantially equal intervals along the circumferential direction.

5. The displacement control member described in claim 1, characterized in that the protrusion includes one or more pairs of the first protrusion and the second protrusion that form a pair, and the tips of the engaging pieces of the first protrusion and the second protrusion that form a pair can overlap on a trajectory of a virtual spiral structure.

6. The displacement restricting member according to claim 1, wherein said base portion is detachable from said first member.

7. A displacement control member as described in any one of claims 1 to 6, characterized in that the first member is a female-threaded body having a female-thread spiral structure set at an appropriate lead angle and / or lead direction, and the shape formed by the tip of the engaging piece forms part of a generally spiral structure having a lead angle and / or lead direction different from the female-thread spiral structure.

8. An engaging member having a hole through which a separate insertion member can be inserted, wherein a displacement restriction member is arranged so as to prevent relative displacement in the circumferential direction, the displacement restriction member having a first protruding portion which protrudes an engaging piece toward the axis at a first position close to the edge of the opening, and a second protruding portion which protrudes the engaging piece at a second position which is farther away from the edge than the first position.

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