JP2017187131A - insert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent loosening of a bolt screwed into an insert.SOLUTION: In a spring accommodating part 11b of a cap 11 forming an insert 3, a coil spring 12 is provided for preventing loosening of a hanging bolt 4 screwed into a female screw hole 10f2 of the insert 3. The coil spring 12 is comprised of, for example, a tension coil spring, and one end portion 12b thereof enters and is fixed to a groove 11b2 of the spring accommodating part 11b. The other end portion 12c of the coil spring 12 enters a groove 11b3 of the spring accommodating part 11b in a movable state. In the coil spring 12, when fastening the hanging bolt 4, a coil portion 12a spreads and permits rotation of the hanging bolt 4, but when detaching the hanging bolt 4, the coil portion 12a is reduced in diameter and prevents rotation of the hanging bolt 4. With this, it is possible to prevent the hanging bolt 4 from loosening even if vibration or the like is frequently applied to the hanging bolt 4 over a long period of time.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an insert. For example, in a structure in which various members are fixed by screwing a male screw portion of a bolt into a female screw hole of an insert embedded in a support body, the bolt screwed into the insert is subjected to vibration or impact ( The following relates to a technique for preventing loosening due to vibration or the like.

  In ceiling construction and equipment construction, ceiling materials and equipment are installed by embedding inserts in a support body such as a building, structure or equipment, and screwing a male thread part such as a suspension bolt into the female thread hole of the insert. Various members such as equipment or electrical wiring are supported and fixed in a suspended state. In addition, about an insert, patent document 1 has description, for example, and the technique which prevents the vibration, noise, etc. which arose by piping etc. from being transmitted to a building etc. through an insert is disclosed.

Japanese Patent Laying-Open No. 2005-180016

  However, when the insert is embedded in a support such as a tunnel, bridge, or road, or when a hanging bolt that is screwed into the insert supports a member such as an air conditioning indoor unit or a ventilation fan. As a result of frequent large vibrations being applied to the suspension bolts over a long period of time, the suspension bolts may be loosened.

  The present invention has been made from the above-described technical background, and an object thereof is to provide a technique capable of preventing loosening of a bolt screwed into an insert.

  In order to solve the above-described problem, the insert according to the first aspect of the present invention is provided with an insert main body having a hollow hole penetrating between both axial end surfaces, and attached to one end surface side in the axial direction of the insert main body. A closing member that closes one end surface in the axial direction of the hole and a male screw portion of a bolt that is provided in a state of being accommodated in the closing member and inserted from the other axial end side of the hollow hole are screwed together A coil spring disposed in the hollow hole, wherein the closing member is opposed to the one end surface in the axial direction in the protrusion, and a protruding portion that protrudes toward the one end surface in the axial direction of the insert body. A coil spring accommodating portion that is provided in a depressed state on the surface, and that accommodates the coil spring, wherein the hollow hole of the insert main body includes a female screw hole into which the male screw portion of the bolt is screwed, and the closing member. A protrusion receiving hole that is received in a state in which the protrusion is fitted, and the coil spring is formed so as to match the pitch of the groove of the male screw portion of the bolt, and rotates in the tightening direction of the bolt. And is provided so as to prevent rotation of the bolt in the disengagement direction.

  According to a second aspect of the present invention, in the first aspect of the present invention, the coil spring is a tension coil spring.

  According to a third aspect of the present invention, in the invention of the second aspect, the bolt is screwed onto the tension coil spring between the tension coil spring and the bottom surface of the protruding portion receiving hole on the opposite side. An interval is provided to allow the extension coil spring to extend in the axial direction when combined.

  The invention according to claim 4 is the invention according to claim 1, 2, or 3, wherein the insert body and the closing member are made of ceramics.

  Further, the present invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the wall surface of the coil spring accommodating portion is a first recess recessed outward from the wall surface. Is formed in a state extending from the upper surface of the projecting portion toward the bottom surface of the coil spring housing portion, and the wall surface of the coil spring housing portion facing the first groove A second groove recessed outward from the wall surface is formed in a state extending from the upper surface of the protruding portion toward the bottom surface of the coil spring accommodating portion, and along the circumferential direction of the coil spring accommodating portion. The coil spring is formed wider than the first groove, and one end portion of the coil spring is supported in the first groove, and the other end portion of the coil spring is inserted in the second groove. Can move within the range of the width of the second groove In such a state, characterized in that it is housed in the coil spring housing portion.

  According to a sixth aspect of the present invention, in the above-described fifth aspect of the present invention, the one end of the coil spring extends from the bottom surface of the first groove toward the upper surface of the protruding portion of the closing member. An extending portion is provided.

  The present invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the coil spring is accommodated on a bottom surface of the coil spring accommodating portion on a surface opposite to a front end surface of the bolt. It is provided in a state where it is further depressed from the bottom surface of the part, and a concave part for accommodating the tip part of the bolt is provided.

  According to the first aspect of the present invention, it is possible to prevent the bolt screwed into the insert from loosening due to vibration or the like.

  According to the second aspect of the present invention, since the holding force of the bolt screwed to the insert can be further improved, the bolt screwed to the insert can be prevented from loosening due to vibration or the like. Become.

  According to the third aspect of the present invention, when the bolt is screwed to the coil spring, the bolt can be screwed to the coil spring without hindering the coil spring from extending in the axial direction.

  According to invention of Claim 4, since the adhesiveness of an insert main body and a closing member can be improved, it becomes possible to improve the waterproofness of an insert.

  According to the fifth aspect of the present invention, by inserting the other end portion of the coil spring into the second groove of the insert body, the movement range of the other end portion can be set to the width of the second groove, and the bolt Since the degree of tightening of the bolt by the coil spring can be adjusted when rotating in the disengagement direction, the bolt screwed into the insert can be prevented from loosening and the bolt can be removed.

  According to the sixth aspect of the present invention, when the coil spring is accommodated in the spring accommodating portion, the extension portion of the one end portion of the coil spring is guided by the first groove, so that the coil spring is stably attached to the spring accommodating portion of the insert body. It can be easily accommodated.

  According to the seventh aspect of the present invention, the bolt loosening prevention effect can be further improved by accommodating the tip of the bolt in the recess.

It is a schematic block diagram of the ceiling structure which is an application example of the insert which concerns on one embodiment of this invention. (A) is a side view of the insert, (b) is a plan view of the upper surface of the insert of FIG. 2 (a), and (c) is a plan view of the lower surface of the insert of FIG. 2 (a). 2A is a cross-sectional view of an insert main body and a cap constituting an insert taken along line II in FIG. 2B, and FIG. 2B is an insert main body and a cap constituting an insert taken along line II-II in FIG. FIG. It is a principal part expanded sectional view of the insert of FIG.3 (b). It is a top view of the back surface of the cap which comprises the insert of FIG. (A) is a top view of the upper surface of the insert main body which comprises the insert of FIG. 2, (b) is sectional drawing of the III-III line of Fig.6 (a). (A) is a plan view of the back surface of the cap constituting the insert of FIG. 2, (b) is a sectional view taken along line IV-IV of FIG. 7 (a), and (c) is a VV line of FIG. 7 (a). FIG. (A) is a top view of the coil spring which comprises the insert of FIG. 2, (b) is a side view of the coil spring of FIG. 8 (a), (c) is a side view of the coil spring orthogonal to FIG.8 (b). (A)-(c) is principal part sectional drawing of the cross section along the axial direction of the insert at the time of suspension bolt mounting | wearing. It is a top view of the back surface of the cap at the time of FIG.9 (b). (A), (b) is explanatory drawing which showed the state of the force added to a suspension bolt from a coil spring. It is a top view of the back surface of a cap at the time of rotating a hanging bolt in the detachment | rotation direction. (A) is explanatory drawing in an insert assembly process, (b) is explanatory drawing in the insert assembly process following Fig.13 (a). It is a top view of the back surface of the cap which comprises the insert which is other embodiment of this invention. (A) is sectional drawing of the surface which cut | disconnected the cap and the insert main body along the axial direction of the insert of FIG. 14, (b) is a cap and insert along the axial direction of an insert in the position orthogonal to Fig.15 (a). It is sectional drawing of the surface which cut | disconnected the main body. It is a top view of the back surface of the cap which comprises the insert which is other embodiment of this invention. It is principal part sectional drawing of the insert which is further another embodiment of this invention.

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

  (First embodiment)

  First, an application example of the insert according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a ceiling structure as an application example of an insert according to an embodiment of the present invention.

  A plurality of inserts 3 are provided at the lower part of a reinforced concrete or the like building structure (support) 2 constituting the beam or slab of the ceiling structure 1 with each female screw hole exposed from the lower surface of the building structure 2. Buried. A male screw portion of a metal suspension bolt 4 formed in a cylindrical rod shape is screwed into the female screw hole of each insert 3, and the ceiling plate 5, the pipe 6, the equipment 7, and the like are provided by the plurality of suspension bolts 4. Such various members are installed in the state suspended below the building housing 2.

  Next, structural examples of the insert according to the present embodiment will be described with reference to FIGS. 2 (a) is a side view of the insert, FIG. 2 (b) is a plan view of the top surface of the insert of FIG. 2 (a), FIG. 2 (c) is a plan view of the bottom surface of the insert of FIG. 3 (a) is a cross-sectional view of the insert main body and the cap constituting the insert taken along line II in FIG. 2 (b), and FIG. 3 (b) is an insert constituting the insert taken along line II-II in FIG. 2 (b). 4 is a cross-sectional view of the main body and the cap, FIG. 4 is an enlarged cross-sectional view of the main part of the insert of FIG. 3B, FIG. 5 is a plan view of the back surface of the cap constituting the insert of FIG. 6B is a cross-sectional view taken along the line III-III in FIG. 6A, and FIG. 7A is a plan view of the back surface of the cap constituting the insert of FIG. 7B is a cross-sectional view taken along the line IV-IV in FIG. ) Is a cross-sectional view taken along line VV in FIG. 7A, FIG. 8A is a plan view of a coil spring constituting the insert in FIG. 2, and FIG. 8B is a side view of the coil spring in FIG. FIG.8 (c) is a side view of the coil spring orthogonal to FIG.8 (b). In FIG. 5, symbol R <b> 1 indicates a tightening rotation direction when the suspension bolt 4 is tightened, and symbol R <b> 2 indicates a separation rotation direction when the suspension bolt 4 is detached.

  The insert 3 is a member that fixes the suspension bolt 4 to the building housing 2 shown in FIG. 1. As shown in FIGS. 2 and 3, the insert main body 10 and a cap (closing member) 11 joined to the upper surface thereof. And a coil spring 12 accommodated in the insert 3 in a state surrounded by them.

  First, the insert main body 10 is a main body member that forms the appearance of the insert 3, and is formed of ceramics such as alumina. By forming the insert body 10 from ceramics, the corrosion resistance of the suspension bolt 4 and the coil spring 12 inside the insert 3 can be improved. The insert body 10 is formed by, for example, a ship (CIP: Cold Isostatic Pressing) molding method. The ship forming method is a forming method for forming a homogeneous and high-density formed body by applying water pressure or the like (isotropically pressed) in a state where a granular ceramic raw material is filled in a rubber mold or the like. By adopting this molding method, the processing dimensional accuracy of the insert body 10 (particularly the processing dimensional accuracy of the female thread) can be improved.

  As shown in FIGS. 2 to 4 and 6, on the outer peripheral side surface of the insert main body 10, there are a large-diameter portion 10 a, a larger-diameter flange portion 10 b formed on the upper side, and a large-diameter portion 10 a. The small-diameter portion 10c formed on the lower side is integrally formed. Since the large-diameter portion 10a and the flange portion 10b are formed in this manner, the insert 3 can be firmly fixed in the building housing 2, so that the fixing strength of the insert 3 with respect to the building housing 2 can be improved.

  Further, as shown in FIG. 2A, a mark M <b> 1 is marked on a part of the outer peripheral side surface of the insert body 10. The mark M1 is a mark for aligning the relative positions of the insert body 10 and the cap 11. The mark M1 will be described later.

  Further, as shown in FIGS. 3 and 6, the insert body 10 is formed with a hollow hole 10 f penetrating between the upper surface 10 d and the lower surface 10 e in the axial direction of the insert body 10. The hollow hole 10f includes, for example, a protruding portion accommodation hole 10f1, a female screw hole 10f2, and a hole 10f3 in order from the upper surface 10d to the lower surface 10e of the insert 3.

  The protruding portion accommodating hole 10f1 is a hole into which a protruding portion 11a of the cap 11 described later is fitted, and is formed on the large diameter portion 10a (upper surface 10d) side. The diameter of the protrusion receiving hole 10f1 is larger than the diameters of the female screw hole 10f2 and the hole 10f3. No groove is formed on the inner periphery of the protruding portion receiving hole 10f1. The female screw hole 10f2 is a hole in which a female screw portion into which the male screw portion of the suspension bolt 4 is screwed is formed, and is formed between the bottom surface of the protruding portion receiving hole 10f1 and a midway position in the axial direction of the small diameter portion 10c. Yes. The hole 10f3 is a hole in which the female screw portion is not formed, and is formed between the lower portion of the female screw hole 10f2 and the lower surface 10e of the insert 3. An internal thread portion may be formed in the hole 10f3 portion to form the internal thread hole 10f2.

  Although not particularly limited, the axial length of the insert body 10 is, for example, 38 mm, and the axial length of the large diameter portion 10a and the flange portion 10b is, for example, 12 mm, the large diameter portion. The diameter of 10a is, for example, 29 mm, the diameter of the flange portion 10b is, for example, 34 mm, the diameter of the small diameter portion 10c is, for example, 20 mm, and the depth of the protruding portion receiving hole 10f1 is, for example, 9.4 mm. The diameter of the hole 10f1 is, for example, 24 to 26 mm.

  Next, the cap 11 is a member that forms the appearance of the insert 3 and protects the coil spring 12 and the suspension bolt 4 in the insert 3 from the material, moisture, and the like of the building housing 2, as shown in FIGS. 2 to 4. Further, the insert body 10 is joined to the upper surface of the insert body 10 in a state in which the protruding portion accommodation hole 10f1 on the upper surface 10d side is closed.

  The cap 11 is made of, for example, ceramics. That is, by forming the cap 11 and the insert body 10 from ceramics, the adhesiveness between the cap 11 and the insert body 10 can be improved, so that the waterproofness of the insert 3 can be improved. The cap 11 is formed by, for example, an injection molding method. In the injection molding method, a powdered ceramic material kneaded with a thermoplastic resin is heated to a temperature equal to or higher than the melting point of the resin, injected into a mold, filled, and then cooled to form a molded body. It is a molding method. By adopting this molding method, the cap 11 having a complicated shape can be molded.

  On the upper surface of the cap 11, a mark M2 is marked as shown in FIG. The mark M2 is a mark for aligning the relative position between the cap 11 and the insert body 10. That is, as shown in FIG. 2, the cap 11 is attached to the insert body 10 with its mark M2 aligned with the mark M1 on the side surface of the insert body 10. Thereby, the relative positions of the female screw hole 10f2 in the insert body 10 and the coil spring 12 in the cap 11 are matched, and the relative positions of the suspension bolt 4 and the coil spring 12 can be matched. . For this reason, it is possible to improve the ease of screwing when the suspension bolt 4 is inserted into the insert 3 and screwed into the coil spring 12.

  Further, as shown in FIGS. 3 to 5 and 7, a protrusion 11 a that protrudes toward the upper surface 10 d of the insert body 10 is formed on the back surface of the cap 11 (the surface facing the upper surface 10 d of the insert body 10). Is formed. The cap 11 is fixed to the upper surface 10d side of the insert body 10 with an adhesive or the like in a state in which the protrusion 11a is fitted into the protrusion receiving hole 10f1 on the upper surface 10d side of the insert body 10.

  A coil spring housing portion (hereinafter simply referred to as a spring housing portion) 11 b is formed on the protruding portion 11 a of the cap 11. The spring accommodating portion 11b is a recess having a concave cross section for accommodating the coil spring 12, and includes a coil portion accommodating portion 11b1 at the center of the tip surface of the protruding portion 11a, and two grooves 11b2 and 11b3 extending radially from the outer periphery thereof. Is integrated.

  The coil spring 12 in the spring accommodating portion 11b is a loosening prevention member that prevents the suspension bolt 4 screwed into the insert 3 from loosening due to vibration or the like, and is constituted by, for example, a tension coil spring. The coil spring 12 is formed of, for example, a metal wire having a circular cross section such as stainless steel, and a central coil portion 12a and one end portion 12b and the other end portion 12c extending in the radial direction from the outer periphery thereof are integrated. It is equipped with.

  The coil portion 12a of the coil spring 12 is a portion that prevents the suspension bolt 4 from being loosened by the suspension bolt 4 being screwed together. For example, as shown in FIGS. 3 to 5 and FIG. It is configured by elastically deforming into a shape. Thus, since the shape of the coil portion 12a can be used with a simple circular spiral shape, compared to a structure in which the helical shape of the coil portion 12a is partially deformed to prevent the suspension bolt 4 from loosening, The manufacturing cost of the insert 3 can be reduced.

  Further, in a coil spring 12 (hereinafter referred to as an initial coil spring) 12 before the suspension bolt 4 is screwed together, the wire members of the coil portions 12a adjacent to each other in the axial direction are in tension with each other. In addition, the inner diameter of the coil portion 12 a of the coil spring 12 at the initial stage is set to be smaller than the diameter of the valley of the male screw portion of the suspension bolt 4. Thus, when the male thread portion of the suspension bolt 4 is screwed into the coil portion 12a, the suspension bolt 4 is firmly held by the coil portion 12a.

  Such a coil portion 12a of the coil spring 12 is accommodated in the coil portion accommodating portion 11b1 of the cap 11 described above. As shown in FIG. 4, the coil portion accommodating portion 11b1 has one axial end surface of the coil portion 12a of the initial coil spring 12 accommodated in the coil portion accommodating portion 11b1 and the protruding portion accommodating hole of the insert body 10 on the opposite side. A gap D1 is formed between the bottom surface of 10f1 (the axial end of the female screw hole 10f2). This distance D1 is an allowance for allowing the extension because the coil spring 12 extends along the axial direction when the suspension bolt 4 is screwed onto the coil spring 12.

  Moreover, as shown in FIG. 4, the coil part accommodating part 11b1 is formed so that the space | interval D2 is ensured between the inner wall surface and the outer periphery of the coil part 12a of the coil spring 12 at the time of initial stage. This interval D2 is an interval for allowing the coil portion 12a to spread radially outward when the suspension bolt 4 is screwed into the coil spring 12.

  As shown in FIGS. 3 to 5 and FIG. 7, a recess 11c that is further recessed from the bottom surface of the coil housing part 11b1 of the spring housing part 11b on the opposite surface of the suspension bolt 4 than the bottom surface of the spring housing part 11b. Is formed. The diameter of the recess 11 c is set to be larger than the diameter of the suspension bolt 4. When the suspension bolt 4 is screwed into the insert 3, the effect of preventing the suspension bolt 4 from loosening can be improved by allowing the tip of the suspension bolt 4 to pass through the coil spring 12 and reach the recess 11c.

  As shown in FIGS. 3 and 8B and 8C, the one end 12b of the coil spring 12 has an extending portion extending from one end side in the axial direction of the coil portion 12a toward the other end side. ing. As shown in FIG. 8C, the extending portion of the one end portion 12b is slightly bent in the circumferential direction of the coil portion 12a.

  As shown in FIGS. 3 to 5, the extending portion of the one end portion 12 b of the coil spring 12 enters and is fixed to one groove (first groove) 11 b 2 of the spring accommodating portion 11 b of the cap 11. As shown in FIGS. 3 and 4, the one groove 11b2 extends from the tip end surface of the projecting portion 11a to the bottom surface of the spring accommodating portion 11b (the surface with which the bottom portion of the coil spring 12 contacts) and terminates. Further, as shown in FIG. 5, the one groove 11b2 extends radially outward from the center of the coil portion accommodating portion 11b1, and terminates at a midway position in the radial direction of the distal end surface of the protruding portion 11a.

  The width of the one groove 11b2 (the length in the circumferential direction of the tip surface of the protruding portion 11a) is set to be slightly larger than the diameter of the wire rod of the coil spring 12. For this reason, when the coil spring 12 is accommodated in the spring accommodating portion 11b, the extending portion of the one end portion 12b is slightly bent as described above, so that the bent portion is pressed against the inner wall surface of the groove 11b2 and acts like a leaf spring. It is supposed to be. Accordingly, when the coil spring 12 is accommodated in the spring accommodating portion 11b of the cap 11, the coil spring 12 is fixed. Therefore, even if the opening of the spring accommodating portion 11b of the cap 11 faces downward, the coil spring 12 does not fall from the spring accommodating portion 11b. It has become.

  The position of the mark M2 on the upper surface of the cap 11 is formed at the position of the groove 11b2 of the spring accommodating portion 11b of the cap 11 (that is, one end portion 12b of the coil spring 12). Thereby, the relative positions of the mark M2 and the coil spring 12 are matched.

  Next, the other end portion 12c of the coil spring 12 is radially outward from the coil portion 12a to the coil portion 12a as shown in FIGS. 3 (b), 4, 5, and 8 (a) and 8 (b). It extends to. The one end 12b and the other end 12c of the coil spring 12 at the initial stage are positioned on a straight line, but the positional relationship between the one end 12b and the other end 12c of the coil spring 12 at the initial stage is limited to this. Various modifications can be made instead of the ones.

  The distal end side of the other end portion 12 c of the coil spring 12 enters the other groove (second groove) 11 b 3 of the spring accommodating portion 11 b of the cap 11. The other groove 11b3 is formed on the opposite side of the one groove 11b2, and extends radially outward from the center of the spring accommodating portion 11b, as shown in FIG. 5, and the radial direction of the distal end surface of the protruding portion 11a. Terminates at a midpoint. Further, as shown in FIGS. 3B and 4, the other groove 11 b 3 extends from the front end surface of the protruding portion 11 a toward the bottom surface of the spring accommodating portion 11 b and does not reach the bottom surface of the spring accommodating portion 11 b. It ends with.

  As shown in FIG. 5, the other groove 11b3 has a width of the groove 11b3 (the length in the circumferential direction of the distal end surface of the protruding portion 11a and the length from the wall surface WS1 to the wall surface WS2 of the groove 11b3). It is formed wider than the groove 11b2. The other end 12c of the coil spring 12 can move within the range of the groove 11b3 (between the wall surface WS1 and the wall surface WS2). That is, when the suspension bolt 4 is screwed into the coil spring 12, the other end 12c of the coil spring 12 moves toward the wall surface WS1 of the groove 11b3, while when the suspension bolt 4 is removed from the coil spring 12, the other end of the coil spring 12. 12c moves toward the wall surface WS2 of the groove 11b3.

  In the present embodiment, as shown in FIG. 5, the length from the position of the other end 12c of the coil spring 12 at the initial stage to one wall surface WS1 of the groove 11b3 (the length in the tightening rotation direction R1). However, when the suspension bolt 4 is screwed to the coil spring 12, the other end portion 12c is moved so that the diameter of the coil portion 12a is widened to such an extent that the suspension bolt 4 can be rotated without difficulty in the tightening rotation direction R1. It is set to a length that can be On the other hand, the length from the position of the other end portion 12c of the coil spring 12 to the other wall surface WS2 of the groove 11b3 is set so that the suspension bolt 4 screwed to the coil spring 12 does not loosen due to vibration or the like. At the same time, if the suspension bolt 4 screwed to the coil spring 12 is applied with a predetermined force and rotated in the separation rotation direction R2, the other end 12c can be moved so that the suspension bolt 4 can be removed. Is set. This will be explained later.

  Although not particularly limited, the diameter of the cap 11 is, for example, 34 mm, the axial length of the protruding portion 11a of the cap 11 is, for example, 9 mm, and the diameter of the protruding portion 11a is, for example, 23-25 mm. The diameter of the coil portion accommodating portion 11b1 of the spring accommodating portion 11b is, for example, about 13.3 mm.

  Next, the operation when the suspension lead is screwed into the insert according to the present embodiment will be described with reference to FIGS. FIGS. 9A to 9C are cross-sectional views of a main part of the cross section along the axial direction of the insert when the suspension bolt is mounted, and FIG. 10 is a plan view of the back surface of the cap at the time of FIG. 9B.

  First, as shown in FIG. 9 (a), the tip of the suspension bolt 4 on the male thread side is inserted from the bolt hole 10f3 (see FIG. 3) of the insert 3, and the suspension bolt 4 is tightened in the rotation direction R1. The male screw portion of the suspension bolt 4 is screwed into the female screw hole 10f2 of the hollow hole 10f of the insert 3 by turning the screw into the female screw. Thereby, the external thread part of the suspension bolt 4 and the internal thread hole 10f2 of the insert 3 can be screwed together without a gap. At this stage, the coil portions 12a adjacent to each other in the axial direction of the coil spring 12 are attracted to each other.

  Subsequently, as shown in FIGS. 9B and 10, when the suspension bolt 4 is further rotated in the tightening rotation direction R <b> 1, the distal end portion of the suspension bolt 4 on the male screw portion side is within the coil portion 12 a of the coil spring 12. Begin to enter. When the suspension bolt 4 is rotated in the tightening rotation direction R <b> 1 as it is, the individual coil portions 12 a adjacent in the axial direction naturally enter the male thread groove of the suspension bolt 4. Thereby, the individual coil portions 12a that are in contact with each other are aligned with each other along the axial direction of the coil spring 12 (below in FIG. 9B) so as to match the pitch of the valleys of the male screw portions of the suspension bolt 4. Arranged apart.

  At this time, when the gap D1 (see FIG. 4) is provided between the bottom surface of the coil spring 12 at the initial stage and the bottom surface of the projecting portion receiving hole 10f1, the coil spring is engaged when the suspension bolt 4 is screwed to the coil spring 12. The suspension bolt 4 can be easily screwed into the coil spring 12 without hindering the 12 from extending in the axial direction.

  At this time, since the coil spring 12 is constituted by a tension coil spring, as shown in FIG. 10, when the suspension bolt 4 is turned in the tightening rotation direction R 1, the other end 12 c of the coil spring 12 is grooved in the cap 11. It moves toward the wall surface WS1 of 11b3. That is, since the other end portion 12c of the coil spring 12 moves in the direction opposite to the winding direction of the coil portion 12a in a state where the one end portion 12b of the coil spring 12 is fixed, the diameter of the coil portion 12a of the coil spring 12 increases. For this reason, since the holding force of the suspension bolt 4 by the coil part 12a becomes weak, the suspension bolt 4 can be rotated without difficulty in the tightening rotation direction R1. Therefore, the suspension bolt 4 can be smoothly screwed into the coil portion 12a of the coil spring 12.

  In the present embodiment, as described above, the suspension bolt 4 is screwed into the coil portion 12a of the coil spring 12 by aligning the positions of the mark M1 with the insert body 10 and the mark M2 with the cap 11. In addition, since the coil spring 12 is formed of a tension coil spring, the individual coil portions 12a are naturally located in the valleys of the male screw portions of the suspension bolt 4 regardless of the position on the outer periphery of the coil spring 12 when the suspension bolt 4 is inserted into the coil portion 12a. Therefore, the suspension bolt 4 can be more easily screwed into the coil portion 12 a of the coil spring 12. In addition, since it is not necessary to adopt a special structure for facilitating screwing of the suspension bolt 4 into the coil portion 12a of the coil spring 12, the structure of the insert 3 can be simplified.

  Subsequently, as shown in FIG. 9 (c), the suspension bolt 4 is further rotated in the tightening rotation direction R <b> 1, and the distal end portion of the suspension bolt 4 on the male thread portion side penetrates the coil spring 12 and enters the recess 11 c of the cap 11. Try to get into. As shown in FIG. 9 (b), even if the tip of the suspension bolt 4 on the male screw portion side does not reach the recess 11c, the suspension bolt 4 can be prevented from loosening, but FIG. 9 (c). As shown in FIG. 5, the effect of preventing the suspension bolt 4 from loosening can be further improved by inserting the tip of the suspension bolt 4 on the male screw portion side into the recess 11c.

  Next, the operation after the suspension bolt 4 is screwed to the insert 3 will be described with reference to FIG. FIGS. 11A and 11B are explanatory views showing a state of force applied from the coil spring to the suspension bolt.

  In the present embodiment, as shown in FIG. 11, when the suspension bolt 4 is screwed to the coil spring 12 by making the diameter of the coil spring 12 smaller than the diameter of the valley of the male thread portion of the suspension bolt 4 as described above, A force Fe (see FIG. 11B) acts from the coil spring 12 toward the central axis of the suspension bolt 4. In the present embodiment, since the coil spring 12 is constituted by a tension coil spring, when the suspension bolt 4 is screwed to the coil spring 12, a force Fp that pulls the coil portion 12a adjacent to each other in the axial direction of the coil spring 12 acts. To do. For this reason, a force Fr obtained by combining the force Fe and the force Fp is applied from the coil spring 12 to the side surface of the mountain of the male thread portion of the suspension bolt 4. Accordingly, since the frictional force at the contact portion between the coil spring 12 and the suspension bolt 4 can be increased as compared with the case where the coil spring 12 is constituted by a compression spring, the holding force of the suspension bolt 4 by the coil spring 12 is further increased. Can be made.

  Next, the loosening prevention action of the suspension bolt 4 will be described with reference to FIG. FIG. 12 is a plan view of the back surface of the cap when the suspension bolt is rotated in the detachment rotation direction.

  In the present embodiment, as shown in FIG. 12, when the suspension bolt 4 rotates in the separation rotation direction R <b> 2, the other end 12 c of the coil spring 12 moves toward the wall surface WS <b> 2 of the groove 11 b <b> 3 of the cap 11. That is, since the other end portion 12c of the coil spring 12 moves toward the winding direction of the coil portion 12a while the one end portion 12b of the coil spring 12 is fixed, the diameter of the coil portion 12a of the coil spring 12 is reduced. For this reason, the retention strength of the suspension bolt 4 by the coil part 12a can be increased. Therefore, even if vibration or the like is frequently applied to the suspension bolt 4 over a long period of time, the suspension bolt 4 can be prevented from loosening. Moreover, since all the coil parts 12a of the coil spring 12 can be made to act as a fastening part of the suspension bolt 4, compared with the structure which cannot make some coil parts 12a of the coil spring 12 act as a fastening part of the suspension bolt 4. Thus, the tightening force of the suspension bolt 4 by the coil spring 12 can be improved, and the reliability of the suspension bolt 4 can be improved.

  Here, when the position of the wall surface WS2 of the groove 11b3 of the cap 11 is closer to the other end 12c of the coil spring 12 at the initial stage than the position shown in FIG. 12, the suspension bolt 4 is turned in the disengagement rotation direction R2. Since the other end portion 12c of the coil spring 12 hits the wall surface WS2 before the coil portion 12a of the coil spring 12 sufficiently tightens the suspension bolt 4, the suspension bolt 4 cannot be prevented from loosening due to vibration or the like. On the other hand, when the position of the wall surface WS2 of the groove 11b3 is farther from the other end 12c of the coil spring 12 at the initial stage than the position shown in FIG. 12, when the suspension bolt 4 is turned in the disengagement rotation direction R2, the coil spring 12 Since the diameter of the coil portion 12a becomes smaller in the direction in which the suspension bolt 4 is tightened, the suspension bolt 4 cannot be removed once the suspension bolt 4 is screwed into the insert 3. Therefore, in the present embodiment, the position of the wall surface WS2 of the groove 11b3 in the spring accommodating portion 11b of the cap 11 can prevent the suspension bolt 4 screwed into the insert 3 from being loosened. It is set to a position where the suspension bolt 4 can be removed even after screwing.

  Next, an example of the assembly process of the insert 3 according to the present embodiment will be described with reference to FIG. FIG. 13A is an explanatory view during the insert assembling step, and FIG. 13B is an explanatory view during the insert assembling step subsequent to FIG. 13A.

  First, as shown in FIG. 13A, with the back surface of the cap 11 facing upward, the coil spring 12 is disposed above the cap spring 12. Subsequently, after the relative positions of the spring accommodating portion 11b and the coil spring 12 on the back surface of the cap 11 are matched, the coil spring 12 is accommodated in the spring accommodating portion 11b. At this time, the coil spring 12 has a simple circular spiral shape, and the interval D2 is provided between the outer periphery of the coil spring 12 and the inner wall of the spring accommodating portion 11b, so that the coil spring 12 is easily accommodated in the spring accommodating portion 11b. be able to. Moreover, since the extension part of the one end part 12b of the coil spring 12 is guided by the groove | channel 11b2, the coil spring 12 can be accommodated in the spring accommodating part 11b stably and easily. Furthermore, the extension part of the one end part 12b of the coil spring 12 is pressed against the wall surface of the groove 11b2 of the cap 11, whereby the coil spring 12 can be fixed in the spring accommodating part 11b.

  Subsequently, after applying an adhesive or the like to the back surface side of the cap 11 housing the coil spring 12, as shown in FIG. 13B, the projecting portion 11a of the cap 11 housing the coil spring 12 is replaced with the projecting portion of the insert body 10. The cap 11 is formed by fitting the protruding portion 11a of the cap 11 into the protruding portion receiving hole 10f1 of the insert body 10 with the mark M2 of the cap 11 and the mark M1 of the insert body 10 aligned with the receiving hole 10f1. Is bonded to the insert body 10. At this time, although the coil spring 12 has elasticity, it is difficult to handle, but in this embodiment, the coil spring 12 can be handled together with the cap 11 in a state of being accommodated in the spring accommodating portion 11b of the cap 11. Therefore, the assembly of the insert 3 can be facilitated.

  (Second Embodiment)

  FIG. 14 is a plan view of the back surface of a cap constituting an insert according to another embodiment of the present invention, and FIG. 15A is a cross-sectional view of the surface of the cap and the insert body cut along the axial direction of the insert of FIG. FIG. 15B is a cross-sectional view of the surface of the cap and the insert body cut along the axial direction of the insert at a position orthogonal to FIG.

  In the present embodiment, the other end portion 12d of the coil spring 12 does not protrude outward from the coil spring 12 and terminates on the frame line of the coil portion 12a. Further, only the groove 11b2 in which the one end 12b of the coil spring 12 is accommodated is formed in the protrusion 11a on the outer periphery of the spring accommodating part 11b of the cap 11, and the groove shown in FIG. 5 or the like of the first embodiment. A groove corresponding to 11b3 is not formed.

  Also in the present embodiment, as in the first embodiment, when the suspension bolt 4 is turned in the separation rotation direction R2, the coil portion 12a of the coil spring 12 is rotated in the separation rotation direction R2 and the suspension bolt 4 is rotated accordingly. 4, but the other end 12 d of the coil spring 12 does not protrude outward from the coil spring 12, so there is nothing to stop the rotation in the separation rotation direction R <b> 2. For this reason, the coil portion 12a of the coil spring 12 is reduced in diameter as the suspension bolt 4 is rotated in the separating rotation direction R2, and the suspension bolt 4 is tightened more and more. Therefore, since the force holding the suspension bolt 4 can be further improved, the suspension bolt 4 can be prevented from loosening due to vibration or the like. In this case, once the suspension bolt 4 is fastened to the insert 3, the suspension bolt 4 cannot be removed. Other than this, the description is omitted because it is the same as that described in the first embodiment.

  (Third embodiment)

  FIG. 16 is a plan view of the back surface of a cap constituting an insert according to another embodiment of the present invention. In FIG. 16, the wall surface WS2 of the groove 11b3 in the case of the first embodiment is indicated by a two-dot chain line for comparison.

  In the present embodiment, the distance from the other end portion 12c of the coil spring 12 at the initial stage to the wall surface WS3 of the groove 11b3 of the cap 11 is set to be longer than that shown in FIG. 5 of the first embodiment. Has been. That is, in this embodiment, when the suspension bolt 4 is fully rotated in the disengagement rotation direction R2 (that is, when the other end portion 12c of the coil spring 12 hits the wall surface WS3 of the groove 11b3), the coil portion of the coil spring 12 As a result of the diameter 12a being reduced and tightening the suspension bolt 4 sufficiently, the suspension bolt 4 can be prevented from loosening, and once the suspension bolt 4 is attached to the insert 3, the suspension bolt 4 cannot be removed. The position of the wall surface WS3 of 11b3 is set. Other than this, the description is omitted because it is the same as that described in the first embodiment.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the embodiment disclosed in this specification is an example in all respects and is limited to the disclosed technology. It is not a thing. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above-described embodiment, but should be construed according to the description of the scope of claims. All modifications are included without departing from the technical scope equivalent to the described technique and the gist of the claims.

  In the above-described embodiment, the case where the concave portion 11c is provided on the bottom surface of the spring accommodating portion 11b in the cap 11 has been described. However, the present invention is not limited to this. For example, as shown in FIG. The concave portion may not be provided on the bottom surface of the accommodating portion 11b. In this case, although it is weaker than in the case of the first embodiment, the effect of preventing the suspension bolt 4 from loosening can be obtained.

  Moreover, in the said embodiment, although the case where the cross-sectional shape of a coil spring was circular shape was demonstrated, it is not limited to this, For example, the cross-sectional shape of a coil spring is good also as a polygon.

  Moreover, in the said embodiment, although the case where the tension coil spring was used as a coil spring was demonstrated, it is not limited to this, For example, a compression coil spring can also be used.

  As described above, in the above-described embodiment, the case where the insert according to the present invention is applied to the ceiling structure and the suspension bolt is fixed has been described. However, the present invention is not limited to this. The present invention can be applied to a fixing structure of another building, structure, or device such as a support structure that supports wiring, piping, and the like on the wall surface.

DESCRIPTION OF SYMBOLS 1 Ceiling structure 2 Building frame 3 Insert 4 Hanging bolt 5 Ceiling board 6 Piping 7 Equipment 10 Insert main body 10a Large diameter part 10b Flange part 10c Small diameter part 10d Upper surface 10e Lower surface 10f Hollow hole 10f1 Projection part accommodation hole 10f2 Female screw hole 10f3 Hole 11 Cap 11a Protruding portion 11b Coil spring accommodating portion 11b1 Coil portion accommodating portion 11b2 Groove 11b3 Groove 11c Recessed portion 12 Coil spring 12a Coil portion 12b One end portion 12c, 12d Other end portion M1, M2 Mark WS1, WS2, WS3 Wall surface

Claims (7)

An insert body having a hollow hole penetrating between both axial end faces;
A closing member attached to one end surface side of the insert body in the axial direction and closing one end surface side of the hollow hole in the axial direction;
A coil spring disposed in the hollow hole so that a male thread portion of a bolt inserted from the other axial end side of the hollow hole is screwed together, provided in a state accommodated in the closing member;
With
The closing member is
A projecting portion projecting toward the one axial end surface of the insert body;
A coil spring housing portion that is provided in a state of being depressed in a surface facing the one end surface in the axial direction in the projecting portion, and that houses the coil spring;
With
The hollow hole of the insert body is
A female screw hole into which the male screw part of the bolt is screwed,
A protrusion accommodating hole accommodated in a state in which the protrusion of the closing member is fitted, and
With
The coil spring is formed so as to match the pitch of the groove of the male screw portion of the bolt, and is provided to allow the bolt to rotate in the tightening direction and to prevent the bolt from rotating in the disengagement direction. An insert characterized by being.   The insert according to claim 1, wherein the coil spring is a tension coil spring.   An interval is provided between the tension coil spring and the bottom surface of the projecting portion receiving hole on the opposite side to allow the tension coil spring to extend in the axial direction when the bolt is screwed into the tension coil spring. The insert according to claim 2.   The insert according to claim 1, 2, or 3, wherein the insert body and the closing member are made of ceramics. The wall surface of the coil spring housing portion is formed with a first groove recessed outward from the wall surface in a state extending from the upper surface of the protruding portion toward the bottom surface of the coil spring housing portion,
On the wall surface of the coil spring housing portion facing the first groove, a second groove that is recessed outward from the wall surface extends from the upper surface of the protruding portion toward the bottom surface of the coil spring housing portion. And is formed wider than the first groove along the circumferential direction of the coil spring housing portion,
One end of the coil spring enters and is supported by the first groove, and the other end of the coil spring enters the second groove and is movable within the range of the width of the second groove. The insert according to any one of claims 1 to 4, wherein the insert is housed in the coil spring housing portion.   The insert according to claim 5, wherein an extension portion extending from a bottom surface of the first groove toward an upper surface of the projecting portion of the closing member is provided at one end portion of the coil spring.   The bottom surface of the coil spring housing portion is provided in a state further depressed than the bottom surface of the coil spring housing portion on the surface facing the front end surface of the bolt, and a recess for housing the front end portion of the bolt is provided. The insert according to any one of claims 1 to 6.

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