JP6715657B2 - insert - Google Patents

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, a bolt screwed into the insert vibrates or impacts ( The present invention relates to a technique for preventing loosening due to vibration or the like.

In the case of ceiling construction or equipment construction, inserts are embedded in a support such as a building, structure, or device, and male threads such as hanging bolts are screwed into the female screw holes of the inserts to make ceiling materials or equipment. Various members such as equipment or electric wiring are supported and fixed in a suspended state. The insert is described in, for example, Patent Document 1, and a technique is disclosed in which vibration, noise, or the like generated in piping or the like is prevented from being transmitted to a building or the like through the insert.

JP 2005-180016 A

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

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

In order to solve the above-mentioned problems, the insert of the present invention according to claim 1 is mounted on an insert main body having a hollow hole penetrating between both axial end faces, and is attached to one axial end face side of the insert main body, A closing member that closes the axial one end surface side of the hole, and a male screw portion of a bolt that is provided in a state housed in the closing member and that is inserted from the other axial end of the hollow hole are screwed together. And a tension coil spring arranged in the hollow hole, wherein the closing member faces the axially one end surface of the insert body, and the protruding portion projects toward the axially one end surface of the insert body. And a coil spring accommodating portion for accommodating the tension coil spring , wherein the hollow hole of the insert body is a female screw hole into which a male screw portion of the bolt is screwed, and the closing member. And a protruding portion accommodation hole for accommodating the protruding portion in a fitted state, wherein the tension coil spring is formed so as to match the pitch of the groove of the male screw portion of the bolt, and in the tightening direction of the bolt. Is provided so as to prevent the rotation of the bolt in the detaching direction, and the bolt is attached to the tension coil spring between the tension coil spring and the bottom surface of the protruding portion accommodation hole on the opposite side thereof. It is characterized in that a space is provided to allow the extension coil spring to extend in the axial direction when screwed .

Further, the present invention according to claim 2 is characterized in that, in the above-mentioned invention according to claim 1 , the insert body and the closing member are made of ceramics.

Further, the present invention according to claim 3 is the above-described invention according to claim 1 or 2 , wherein the wall surface of the coil spring accommodating portion has a first groove that is recessed outward from the wall surface. It is formed in a state of extending from the upper surface of the portion toward the bottom surface of the coil spring accommodating portion, and the wall surface of the coil spring accommodating portion facing the first groove is located outside the wall surface. A second groove that is recessed inward is formed so as to extend from the upper surface of the protruding portion toward the bottom surface of the coil spring accommodating portion, and the first groove is formed along the circumferential direction of the coil spring accommodating portion. The coil spring is formed wider than the first groove, and one end of the coil spring is inserted into and supported by the first groove, and the other end of the coil spring is inserted into the second groove. The coil spring is accommodated in the coil spring accommodating portion in a movable state within the range of the width.

Further, the present invention according to claim 4 is the invention according to claim 3 described above, wherein one end portion of the coil spring extends from a bottom surface of the first groove toward an upper surface of the protruding portion of the closing member. It is characterized in that an extended portion is provided.

The invention according to claim 5 is the invention according to any one of claims 1 to 4 described above, in which, on the bottom surface of the coil spring accommodating portion, the coil spring accommodating member is provided on a surface facing the tip end surface of the bolt. It is characterized in that a concave portion is provided which is recessed from the bottom surface of the portion and accommodates the tip portion of the bolt.

According to the invention described in claim 1, it becomes possible to prevent the bolt screwed to the insert from loosening due to vibration or the like.

Further , according to the invention of claim 1, since the holding force of the bolt screwed into the insert can be further improved, it is possible to prevent the bolt screwed into the insert from loosening due to vibration or the like. It will be possible.

Further, according to the invention described in claim 1 , when the bolt is screwed into the coil spring, the bolt can be screwed into the coil spring without inhibiting the coil spring from extending in the axial direction.

According to the second aspect of the invention, the adhesiveness between the insert body and the closing member can be improved, so that the waterproof property of the insert can be improved.

According to the invention described in claim 3 , by inserting the other end of the coil spring into the second groove of the insert body, the moving range of the other end can be set to the width of the second groove. Since the tightening degree of the bolt by the coil spring can be adjusted when rotating in the detaching direction, the bolt screwed into the insert can be prevented from loosening, and the bolt can be removed.

According to the invention of claim 4 , when the coil spring is accommodated in the spring accommodating portion, the extending portion of the one end portion of the coil spring is guided by the first groove, so that the coil spring is stably accommodated in the spring accommodating portion of the insert body. It can be easily accommodated.

According to the invention described in claim 5, the effect of preventing the loosening of the bolt can be further improved by accommodating the tip portion 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. 2A is a side view of the insert, FIG. 2B is a plan view of an upper surface of the insert shown in FIG. 2A, and FIG. 2C is a plan view of a lower surface of the insert shown in FIG. 2A is a cross-sectional view of an insert body and a cap that form the insert along line II of FIG. 2B, and FIG. 2B is an insert body and a cap that form the insert along line II-II of FIG. 2B. 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. FIG. 6A is a plan view of an upper surface of an insert body that constitutes the insert of FIG. 2, and FIG. 6B is a cross-sectional view taken along line III-III of FIG. (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 taken along line VV of FIG. 7(a). FIG. 8A is a plan view of a coil spring that constitutes the insert of FIG. 2, FIG. 8B is a side view of the coil spring of FIG. 8A, and FIG. 8C is a side view of the coil spring orthogonal to FIG. (A)-(c) is a principal part sectional drawing of the cross section along the axial direction of an insert at the time of mounting a hanging bolt. 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 applied to a suspension bolt from a coil spring. It is a top view of the back surface of a cap when a hanging bolt is rotated in a detachment rotation direction. FIG. 13A is an explanatory diagram during the insert assembling process, and FIG. 13B is an explanatory diagram during the insert assembling process following FIG. 13A. It is a top view of the back of a cap which constitutes an insert which is other embodiments of the present 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) shows the cap and insert along the axial direction of the insert in the position orthogonal to FIG. 15(a). It is sectional drawing of the surface which cut the main body. It is a top view of the back of a cap which constitutes an insert which is other embodiments of the present invention. It is a principal part sectional view of the insert which is other embodiment of this invention.

Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. In addition, in the drawings for describing the embodiments, the same components are denoted by the same reference symbols in principle, and repeated 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 which is an application example of an insert according to an embodiment of the present invention.

In the lower part of the building frame (support) 2 made of reinforced concrete or the like that composes the beams or slabs of the ceiling structure 1, a plurality of inserts 3 are provided, with each female screw hole being exposed from the lower surface of the building frame 2. It is buried. A male thread portion of a metal hanging bolt 4 formed in a cylindrical rod shape is screwed into the female screw hole of each insert 3, and the ceiling board 5, the pipe 6 and the facility equipment 7 and the like are made by the plurality of hanging bolts 4. Various members such as the above are installed in a state of being hung below the building body 2.

Next, a structural example of the insert of 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 upper surface of the insert of FIG. 2(a), and FIG. 2(c) is a plan view of the lower surface of the insert of FIG. 2(a). 3(a) is a cross-sectional view of an insert body and a cap constituting the insert taken along the line I-I of FIG. 2(b), and FIG. 3(b) is an insert constituting the insert taken along the line II-II of FIG. 2(b). 4 is a sectional view of the main body and the cap, FIG. 4 is an enlarged sectional view of an essential part of the insert of FIG. 3(b), FIG. 5 is a plan view of the back surface of the cap constituting the insert of FIG. 2, and FIG. 6B is a plan view of the upper surface of the insert body that constitutes the insert, FIG. 6B is a cross-sectional view taken along the line III-III of FIG. 6A, and FIG. 7A is a plan view of the back surface of the cap that constitutes the insert of FIG. FIG. 7(b) is a sectional view taken along line IV-IV of FIG. 7(a), FIG. 7(c) is a sectional view taken along line VV of FIG. 7(a), and FIG. 8(b) is a side view of the coil spring of FIG. 8(a), and FIG. 8(c) is a side view of the coil spring orthogonal to FIG. 8(b). It should be noted that reference symbol R1 in FIG. 5 indicates a tightening rotation direction when the suspension bolt 4 is tightened, and reference symbol R2 indicates a removal rotation direction when the suspension bolt 4 is removed.

The insert 3 is a member for fixing the suspension bolt 4 to the building body 2 shown in FIG. 1, and as shown in FIGS. 2 and 3, the insert body 10 and a cap (closing member) 11 joined to the upper surface thereof. And a coil spring 12 housed inside the insert 3 while being surrounded by them.

First, the insert body 10 is a body member that forms the appearance of the insert 3, and is made of, for example, ceramics such as alumina. Since the insert body 10 is made of ceramics, the corrosion resistance of the hanging 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 molding method is a molding method of forming a homogeneous and high-density molded body by applying water pressure or the like (isotropically pressing) 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 (in particular, the processing dimensional accuracy of the female screw) can be improved.

As shown in FIGS. 2 to 4 and 6, the outer peripheral side surface of the insert body 10 includes a large diameter portion 10a, a larger diameter flange portion 10b formed on the upper side thereof, and a large diameter portion 10a. The small diameter portion 10c formed on the lower side is integrally formed. By forming the large-diameter portion 10a and the flange portion 10b in this manner, the insert 3 can be firmly fixed in the building body 2, and thus the fixing strength of the insert 3 to the building body 2 can be improved.

Further, as shown in FIG. 2A, a mark M1 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.

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

The protruding portion accommodation 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 protruding portion accommodation hole 10f1 is larger than the diameters of the female screw hole 10f2 and the hole 10f3. No groove is formed on the inner circumference of the protrusion housing hole 10f1. The female screw hole 10f2 is a hole in which a female screw portion with 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 accommodation hole 10f1 and an intermediate position in the axial direction of the small diameter portion 10c. There is. 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. A female screw portion may be formed in the hole 10f3 to form the female screw 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 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 accommodation hole 10f1 is, for example, 9.4 mm, and the protruding portion is accommodated. 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 hanging bolt 4 in the insert 3 from the material of the building body 2, moisture, etc., and as shown in FIGS. 2 to 4. Further, it 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 of the insert body 10 is closed.

The cap 11 is made of, for example, ceramics. That is, since the cap 11 and the insert body 10 are made of ceramics, the adhesion between the cap 11 and the insert body 10 can be improved, so that the waterproof property 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 raw material into which a thermoplastic resin is kneaded is heated to a temperature not lower than the melting point of the resin, injected into a mold to be 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.

As shown in FIG. 2B, a mark M2 is printed on the upper surface of the cap 11. The mark M2 is a mark for aligning the relative positions of 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. As a result, the relative position 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. .. Therefore, it is possible to improve the ease of screwing when the hanging bolt 4 is inserted into the insert 3 and screwed into the coil spring 12.

Further, on the back surface of the cap 11 (the surface facing the upper surface 10d of the insert body 10), as shown in FIGS. 3 to 5 and 7, a protruding portion 11a protruding toward the upper surface 10d of the insert body 10 is provided. Has been 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 protruding portion 11a is fitted into the protruding part accommodation hole 10f1 on the upper surface 10d side of the insert body 10.

A coil spring accommodating portion (hereinafter simply referred to as a spring accommodating portion) 11b is formed on the protruding portion 11a 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 end surface of the protruding portion 11a and two grooves 11b2 and 11b3 extending radially from the outer periphery thereof. Have in one.

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 configured by, for example, a tension coil spring. The coil spring 12 is formed of, for example, a metal wire rod having a circular cross section such as stainless steel, and integrally includes a central coil portion 12a and one end portion 12b and the other end portion 12c extending radially from the outer circumference thereof. Prepared for.

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

Further, in the coil spring 12 (hereinafter referred to as the initial coil spring) before the suspension bolt 4 is screwed, the wire rods of the coil portions 12a adjacent to each other in the axial direction are in tension with each other and are in contact with each other. The inner diameter of the coil portion 12a 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 hanging bolt 4. Thereby, when the male screw 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.

The coil portion 12a of the coil spring 12 is housed in the coil portion housing portion 11b1 of the cap 11 described above. As shown in FIG. 4, the coil portion accommodating portion 11b1 includes an axial end surface of the coil portion 12a of the coil spring 12 initially stored in the coil portion accommodating portion 11b1 and a projecting portion accommodating hole of the insert body 10 on the opposite side. A space D1 is formed between the bottom surface of 10f1 (the axial end of the female screw hole 10f2). The interval D1 is an extension allowance for allowing the extension because the coil spring 12 extends along the axial direction as the suspension bolt 4 is screwed into the coil spring 12.

Further, as shown in FIG. 4, the coil portion accommodating portion 11b1 is formed such that a space D2 is secured between the inner wall surface thereof and the outer periphery of the coil portion 12a of the coil spring 12 at the initial stage. The space D2 is a space for allowing the coil portion 12a to spread radially outward when the suspension bolt 4 is screwed into the coil spring 12.

Further, as shown in FIG. 3 to FIG. 5 and FIG. 7, in the bottom surface of the coil housing portion 11b1 of the spring housing portion 11b, on the surface facing the hanging bolt 4, a recessed portion 11c that is further recessed than the bottom surface of the spring housing portion 11b. Are formed. The diameter of the recess 11c is set to be larger than the diameter of the suspension bolt 4. When the hanging bolt 4 is screwed into the insert 3, the loosening prevention effect of the hanging bolt 4 can be improved by allowing the tip of the hanging bolt 4 to penetrate the coil spring 12 and reach the inside of the recess 11c.

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

The extending portion of the one end portion 12b of the coil spring 12 enters and is fixed to one groove (first groove) 11b2 of the spring accommodating portion 11b of the cap 11, as shown in FIGS. As shown in FIGS. 3 and 4, the one groove 11b2 extends from the tip end surface of the protruding portion 11a to the bottom surface of the spring housing 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 housing portion 11b1 and terminates at a midway position in the radial direction of the tip end surface of the protrusion 11a.

The width of the one groove 11b2 (the circumferential length of the tip end surface of the protruding portion 11a) is set to be slightly larger than the diameter of the wire material of the coil spring 12. Therefore, when the coil spring 12 is housed in the spring housing portion 11b, the extending portion of the one end portion 12b is slightly bent as described above, and the bent portion is pressed against the inner wall surface of the groove 11b2 to act like a leaf spring. It is supposed to do. As a result, when the coil spring 12 is housed in the spring housing portion 11b of the cap 11, the coil spring 12 is fixed, so that the coil spring 12 does not fall from the spring housing portion 11b even if the opening of the spring housing portion 11b of the cap 11 faces downward. 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 (that is, the one end 12b of the coil spring 12) of the spring housing portion 11b of the cap 11. As a result, the relative positions of the mark M2 and the coil spring 12 are aligned.

Next, as shown in FIGS. 3(b), 4, 5, and 8(a), (b), the other end 12c of the coil spring 12 is positioned radially outward from the coil portion 12a to the coil portion 12a. Has been extended to. The one end 12b and the other end 12c of the coil spring 12 at the initial stage are located 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. It is not a thing but various changes can be made.

The tip side of the other end 12c of the coil spring 12 is inserted into the other groove (second groove) 11b3 of the spring accommodating portion 11b of the cap 11. The other groove 11b3 is formed on the opposite side of the one groove 11b2, extends radially outward from the center of the spring accommodating portion 11b, and extends in the radial direction of the tip surface of the protrusion 11a, as shown in FIG. Ends in the middle position. As shown in FIGS. 3B and 4, the other groove 11b3 extends from the tip end surface of the protruding portion 11a toward the bottom surface of the spring housing portion 11b and does not reach the bottom surface of the spring housing portion 11b. Ends with.

As shown in FIG. 5, the other groove 11b3 has one of the widths (the circumferential length of the tip surface of the protruding portion 11a and the length from the wall surface WS1 to the wall surface WS2 of the groove 11b3) of the groove 11b3. It is formed wider than the groove 11b2. The other end 12c of the coil spring 12 is movable 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 is removed. 12c moves toward the wall surface WS2 of the groove 11b3.

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

In addition, although not particularly limited, the diameter of the cap 11 is, for example, 34 mm, the axial length of the protrusion 11 a of the cap 11 is, for example, 9 mm, and the diameter of the protrusion 11 a is, for example, 23 to 25 mm. The diameter of the coil housing portion 11b1 of the spring housing portion 11b is, for example, about 13.3 mm.

Next, the operation of screwing the suspension lead into the insert of the present embodiment will be described with reference to FIGS. 9 and 10. 9A to 9C are cross-sectional views of a main part of a cross section along the axial direction of the insert when the hanging bolt is attached, 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. 9A, the tip of the hanging bolt 4 on the male screw side is inserted from the bolt hole 10f3 (see FIG. 3) of the insert 3 and the hanging bolt 4 is tightened in the rotation direction R1. The male screw portion of the hanging bolt 4 is screwed into the female screw hole 10f2 of the hollow hole 10f of the insert 3 by turning the screw bolt 4 into the. As a result, the male screw portion of the hanging bolt 4 and the female screw 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 and are in contact with each other.

Then, as shown in FIG. 9B and FIG. 10, when the suspension bolt 4 is further rotated in the tightening rotation direction R1, the tip of the suspension bolt 4 on the male screw side is inside the coil portion 12a of the coil spring 12. Start entering. When the suspension bolt 4 is rotated in the tightening rotation direction R1 as it is, the individual coil portions 12a adjacent in the axial direction naturally enter the male screw groove of the suspension bolt 4. As a result, the individual coil portions 12a that have been in contact with each other are aligned along the axial direction (downward in FIG. 9B) of the coil spring 12 so as to match the pitch of the valleys of the male screw portions of the suspension bolt 4. They are placed apart.

At this time, 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 accommodation hole 10f1, so that when the suspension bolt 4 is screwed into the coil spring 12, The suspension bolt 4 can be easily screwed onto the coil spring 12 without hindering the axial extension of the suspension bolt 12.

Further, at this time, since the coil spring 12 is constituted by the tension coil spring, as shown in FIG. 10, when the suspension bolt 4 is rotated in the tightening rotation direction R1, the other end 12c of the coil spring 12 is moved along with it and the groove 12 of the cap 11 is rotated. It moves toward the wall surface WS1 of 11b3. That is, with the one end 12b of the coil spring 12 fixed, the other end 12c of the coil spring 12 moves in the direction opposite to the winding direction of the coil 12a, so that the diameter of the coil 12a of the coil spring 12 increases. Therefore, the holding force of the suspension bolt 4 by the coil portion 12a is weakened, so that the suspension bolt 4 can be smoothly rotated 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.

Further, in the present embodiment, as described above, the hanging bolt 4 is screwed into the coil portion 12a of the coil spring 12 by aligning the position of the mark M1 with the insert body 10 and the position of the mark M2 of the cap 11. In addition, since the coil spring 12 is formed of a tension coil spring, each coil portion 12a naturally comes into the trough of the male screw portion of the hanging bolt 4 regardless of the position of the outer circumference of the coil spring 12 into the coil portion 12a. Since it is adapted to enter, the suspension bolt 4 can be further easily screwed into the coil portion 12a of the coil spring 12. Further, since it is not necessary to employ a special structure for facilitating the hanging bolt 4 to be screwed into the coil portion 12a of the coil spring 12, the structure of the insert 3 can be simplified.

Subsequently, as shown in FIG. 9C, the suspension bolt 4 is further rotated in the tightening rotation direction R1, and the tip of the suspension bolt 4 on the male screw portion side penetrates the coil spring 12 and enters the recess 11c of the cap 11. Try to get in. As shown in FIG. 9B, even if the tip of the hanging bolt 4 on the male screw side does not reach the concave portion 11c, the function of preventing the hanging bolt 4 from loosening can be obtained. As shown in, by inserting the tip of the hanging bolt 4 on the male screw side into the recess 11c, the effect of preventing the hanging bolt 4 from loosening can be further improved.

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

In the present embodiment, as shown in FIG. 11, when the diameter of the coil spring 12 is made smaller than the diameter of the valley of the male screw portion of the suspension bolt 4 as described above, when the suspension bolt 4 is screwed into the coil spring 12, A force Fe (see FIG. 11B) acts from the coil spring 12 toward the central axis of the hanging bolt 4. Further, in the present embodiment, since the coil spring 12 is configured by the extension coil spring, when the suspension bolt 4 is screwed into the coil spring 12, a force Fp pulling the coil portions 12a adjacent to each other in the axial direction of the coil spring 12 acts. To do. Therefore, a force Fr, which is a combination of the force Fe and the force Fp, is applied from the coil spring 12 to the side surface of the crest of the male screw portion of the suspension bolt 4. Therefore, 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 formed of a compression spring, and thus 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 hanging bolt 4 will be described with reference to FIG. FIG. 12 is a plan view of the back surface of the cap when the hanging bolt is rotated in the detaching rotation direction.

In the present embodiment, as shown in FIG. 12, when the suspension bolt 4 rotates in the detaching rotation direction R2, the other end 12c of the coil spring 12 moves toward the wall surface WS2 of the groove 11b3 of the cap 11 accordingly. That is, since the other end 12c of the coil spring 12 moves in the winding direction of the coil 12a while the one end 12b of the coil spring 12 is fixed, the diameter of the coil 12a of the coil spring 12 becomes smaller. Therefore, the holding force of the suspension bolt 4 by the coil portion 12a can be increased. Therefore, even if vibration or the like is frequently applied to the suspension bolt 4 for a long period of time, the suspension bolt 4 can be prevented from loosening. Further, since all the coil portions 12a of the coil spring 12 can be made to act as the tightening portions of the hanging bolts 4, compared to the structure in which some of the coil portions 12a of the coil springs 12 cannot be made to act as the tightening portions of the hanging bolts 4. Therefore, the tightening force of the suspension bolt 4 by the coil spring 12 can be improved, and the reliability of the loosening prevention 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 time than the position shown in FIG. 12, the suspension bolt 4 is rotated in the detachment rotation direction R2. Since the other end 12c of the coil spring 12 hits the wall surface WS2 while the coil portion 12a of the coil spring 12 does not tighten the suspension bolt 4 sufficiently, 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 located 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 rotated in the disengagement rotation direction R2, the coil spring 12 moves. Since the diameter of the coil portion 12a becomes smaller in the direction in which the suspension bolt 4 is tightened, once the suspension bolt 4 is screwed into the insert 3, the suspension bolt 4 cannot be removed. 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 hanging bolt 4 screwed into the insert 3 from loosening, and moreover, the hanging bolt 4 is attached to the insert 3. It is set at a position where the hanging bolt 4 can be removed even after screwing.

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

First, as shown in FIG. 13A, with the back surface of the cap 11 facing upward, the coil spring 12 is arranged above it. Subsequently, after the relative positions of the spring housing portion 11b on the back surface of the cap 11 and the coil spring 12 are aligned, the coil spring 12 is housed in the spring housing portion 11b. At this time, since the coil spring 12 has a simple circular spiral shape, and the gap D2 is provided between the outer circumference of the coil spring 12 and the inner wall of the spring housing portion 11b, the coil spring 12 is easily housed in the spring housing portion 11b. be able to. Further, since the extending portion of the one end portion 12b of the coil spring 12 is guided by the groove 11b2, the coil spring 12 can be stably and easily housed in the spring housing portion 11b. Further, the coil spring 12 can be fixed in the spring accommodating portion 11b by pressing the extending portion of the one end 12b of the coil spring 12 against the wall surface of the groove 11b2 of the cap 11.

Subsequently, after applying an adhesive or the like to the back surface side of the cap 11 accommodating the coil spring 12, as shown in FIG. 13B, the protrusion 11 a of the cap 11 accommodating the coil spring 12 is replaced with the protrusion of the insert body 10. The projection 11a of the cap 11 is fitted into the projection housing 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 toward the housing hole 10f1. Is adhered to the insert body 10. At this time, the coil spring 12 is difficult to handle because it has elasticity, but in the present embodiment, the coil spring 12 can be handled together with the cap 11 while being housed in the spring housing 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 which is another embodiment of the present invention, and FIG. 15(a) is a cross-sectional view of the surface obtained by cutting the cap and the insert body along the axial direction of the insert of FIG. FIG. 15(b) is a cross-sectional view of a surface obtained by cutting the cap and the insert body along the axial direction of the insert at a position orthogonal to FIG. 15(a).

In the present embodiment, the other end portion 12d of the coil spring 12 does not project to the outside of the coil spring 12 and terminates on the frame line of the coil portion 12a. Further, only the groove 11b2 for accommodating the one end 12b of the coil spring 12 is formed in the protruding portion 11a on the outer periphery of the spring accommodating portion 11b of the cap 11, and the groove shown in FIG. 5 or the like of the first embodiment is formed. The groove corresponding to 11b3 is not formed.

Also in this embodiment, as in the case of the first embodiment, when the suspension bolt 4 is rotated in the disengagement rotation direction R2, the coil portion 12a of the coil spring 12 also rotates in the disengagement rotation direction R2 and accordingly the suspension bolt 4 is rotated. 4 is tightened, but since the other end 12d of the coil spring 12 does not project to the outside of the coil spring 12, there is nothing to stop the rotation in the detachment rotation direction R2. Therefore, as the hanging bolt 4 is rotated in the detaching rotation direction R2, the diameter of the coil portion 12a of the coil spring 12 is reduced and the hanging bolt 4 is tightened more and more. Therefore, the force for holding the suspension bolt 4 can be further improved, so that 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. Except for 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 that constitutes an insert according to another embodiment of the present invention. Note that, in FIG. 16, the wall surface WS2 of the groove 11b3 in the case of the first embodiment is shown by a chain double-dashed line for comparison.

In the present embodiment, the distance from the other end 12c of the coil spring 12 to the wall surface WS3 of the groove 11b3 of the cap 11 at the initial time is set longer than that shown in FIG. 5 and the like of the first embodiment. Has been done. That is, in the present embodiment, when the suspension bolt 4 is fully rotated in the detaching 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 is formed. As a result of reducing the diameter of 12a and sufficiently tightening the hanging bolt 4, the hanging bolt 4 is prevented from loosening, and once the hanging bolt 4 is attached to the insert 3, the hanging bolt 4 cannot be removed. The position of the wall surface WS3 of 11b3 is set. Except for this, the description is omitted because it is the same as that described in the first embodiment.

Although the invention made by the present inventor has been specifically described based on the embodiments, the embodiments disclosed in the present specification are exemplifications in all respects, and are limited to the disclosed technology. Not a thing. That is, the technical scope of the present invention should not be limitedly interpreted based on the description of the above-described embodiments, but should be interpreted according to the description of the claims to the last. All modifications are included without departing from the spirit of the claims and the technology equivalent to the described technology.

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

Further, in the above embodiment, the case where the cross-sectional shape of the coil spring is circular has been described, but the present invention is not limited to this, and the cross-sectional shape of the coil spring may be polygonal, for example.

Further, in the above embodiment, the case where the tension coil spring is used as the coil spring has been described, but the present invention is not limited to this, and for example, a compression coil spring may 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 to fix the hanging bolt has been described, but the present invention is not limited to this, and for example, in a tunnel. It can be applied to a fixed structure for other buildings, structures or devices such as a support structure for supporting wiring or piping on the wall surface.

1 Ceiling Structure 2 Building Frame 3 Insert 4 Hanging Bolt 5 Ceiling Board 6 Piping 7 Equipment 10 Equipment Main Body 10a Large Diameter Part 10b Flange Part 10c Small Diameter Part 10d Upper Surface 10e Lower Surface 10f Hollow Hole 10f1 Projection Housing Hole 10f2 Female Screw Hole 10f3 Hole 11 Cap 11a Projection 11b Coil spring housing 11b1 Coil housing 11b2 Groove 11b3 Groove 11c Recess 12 Coil spring 12a Coil 12b One end 12c, 12d Other end M1, M2 Mark WS1, WS2, WS3 Wall surface

Claims (5)

An insert body having a hollow hole penetrating between both axial end surfaces,
A closing member that is mounted on the axial direction one end face side of the insert body and closes the axial one end face side of the hollow hole,
A tension coil spring arranged in the hollow hole, provided in a state of being housed in the closing member, so that a male screw portion of a bolt inserted from the other end side in the axial direction of the hollow hole is screwed.
Equipped with
The closing member is
A protrusion that protrudes toward the one end face in the axial direction of the insert body,
A coil spring accommodating portion that accommodates the tension coil spring , the coil spring accommodating portion being provided in a state of being recessed in a surface facing the one end surface in the axial direction in the projecting portion,
Equipped with
The hollow hole of the insert body,
A female screw hole into which the male screw portion of the bolt is screwed,
A protrusion housing hole that is accommodated in a state in which the protrusion of the closing member is fitted;
Equipped with
The tension 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 rotation of the bolt in the tightening direction and prevent rotation of the bolt in the disengagement direction. ,
An interval is provided between the tension coil spring and the bottom surface of the projecting portion accommodation hole opposite to the tension coil spring, which allows the tension coil spring to extend in the axial direction when the bolt is screwed into the tension coil spring. ,
An insert characterized by that. The insert according to claim 1, wherein the insert body and the closing member are made of ceramics . On the wall surface of the coil spring accommodating portion, a first groove recessed outward from the wall surface is formed in a state of extending from the upper surface of the protruding portion toward the bottom surface of the coil spring accommodating portion,
On the wall surface of the wall surface of the coil spring accommodating portion facing the first groove, a second groove recessed outward from the wall surface extends from the upper surface of the protrusion toward the bottom surface of the coil spring accommodating portion. And is formed to be wider than the first groove along the circumferential direction of the coil spring accommodating portion,
One end of the tension coil spring is inserted into and supported by the first groove, and the other end of the tension coil spring is inserted into the second groove and is movable within the width of the second groove. In this state, the coil spring is accommodated in the coil spring accommodating portion,
The insert according to claim 1 or 2 , characterized in that: The insert according to claim 3 , wherein an extension portion extending from a bottom surface of the first groove toward an upper surface of the protrusion of the closing member is provided at one end of the tension coil spring . On the bottom surface of the coil spring accommodating portion, a concave portion is provided on a surface facing the tip end surface of the bolt so as to be recessed further than the bottom surface of the coil spring accommodating portion, and to accommodate the tip end portion of the bolt. The insert according to any one of claims 1 to 4.

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