WO2006057039A1 - ブラインドボルト - Google Patents
ブラインドボルト Download PDFInfo
- Publication number
- WO2006057039A1 WO2006057039A1 PCT/JP2004/017504 JP2004017504W WO2006057039A1 WO 2006057039 A1 WO2006057039 A1 WO 2006057039A1 JP 2004017504 W JP2004017504 W JP 2004017504W WO 2006057039 A1 WO2006057039 A1 WO 2006057039A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bolt
- hole
- outer diameter
- insertion pin
- expanded
- Prior art date
Links
- 238000003780 insertion Methods 0.000 claims abstract description 90
- 230000037431 insertion Effects 0.000 claims abstract description 90
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like
- F16B13/126—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like fastened by inserting an unthreaded element, e.g. pin or nail
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/02—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws divided longitudinally
Definitions
- the present invention relates to a blind bolt that can be fastened by an operation from one side when another member is fastened to a member that cannot reach the inside or the back side.
- Japanese Patent Application Laid-Open No. 2000-154810 describes a bolt with a retaining function for the purpose of driving in and fixing a single side force pin and enabling tightening after fixing (Patent Document 1). ).
- This bolt with a retaining function has a center hole drilled in the axis of the male screw rod into which the nut is screwed, and a slit-shaped “split” that reaches the center hole at the end of this screw rod.
- the split portion can be expanded by a pin that is forcibly inserted into the central hole. Then, the member is fastened between the expanded portion expanded by the insertion of the pin and the nut.
- Patent Document 1 JP 2000-154810 A
- the end portion of the split portion is expanded and deformed in a tapered shape on the back side of the fastener, and the outer peripheral surface of the expanded deformed portion becomes a pilot hole of the fastener.
- the sliding contact prevents the rod from coming off by this frictional force.
- the portion that is caught on the fastening object by the expanding deformation portion is very limited and small. For this reason, tensile force is applied in the axial direction. If used, the rod may move easily in the axial direction and the tightening may be loosened. In order to prevent such loosening, it is conceivable to expand the expanding deformation part more greatly.
- the male thread rod and the pin are loosely configured in an integrated configuration. For this reason, storage and carrying are inconvenient. Especially for blind bolts with a wide range of outer diameters of several mm— “several mm”, it is extremely troublesome to find a suitable pin each time.
- the present invention has been made to solve such problems, and can reduce the driving resistance of the insertion pin into the bolt body, and can reduce the size of the expanded portion and the thickness of the bolt. Stable and high fastening force can be obtained by setting the balance appropriately, the timing of expansion by driving the insertion pin and the position of nut tightening can be easily recognized, and co-rotation can be prevented, etc.
- the purpose is to provide an excellent blind bolt.
- the blind bolt according to the present invention is characterized in that it has a tapered slit that divides the front end portion into a plurality of portions along the axial direction, and has a radially expanded portion, and a nut at the rear end portion.
- a bolt main body having a through hole extending in the axial direction and an insertion pin inserted into the through hole of the bolt main body.
- the contour shape of the front end surface of the bolt body is a pseudopolygon made up of a plurality of arcs, and when the insertion pin passes through the through hole and enters the slit, the front end portion expands.
- the outer diameter of the expanded portion is projected in the radial direction. At this time, it is preferable that the outer diameter of the expanded portion protrudes by about 30% in the radial direction than the outer diameter of the external thread portion.
- the outer diameter of the expanded portion is formed to be about 1.3 times the outer diameter of the external thread portion, and the slit width is determined based on the difference between the outer diameter size of the expanded portion and the pilot hole diameter size of the fastener. It is formed to be in the range of 0.21 to 0.27 times the outer diameter of the threaded portion, and has an outer diameter that allows the expanded portion to slide in contact with the inner peripheral surface of the lower hole when inserted into the lower hole of the fastener. Thus, it is preferable to reduce the diameter of the tip of the bolt body in advance.
- the insertion pin is inserted into the outer diameter of the rear portion of the tip portion from the expanded portion.
- it is formed in a size that protrudes in the radial direction from the male thread portion and comes into contact with the prepared hole of the fastener, and at the same time, a longitudinal groove for preventing co-rotation is formed along the axial direction.
- it is preferable.
- the insertion pin is integrally attached to the bolt body, and the insertion bolt is struck when the insertion bolt is inserted into the pilot hole, the insertion pin is inserted into the through hole.
- the pin insertion resistance force when inserting the insertion pin into the through hole is the same as when the expansion part is inserted into the pilot hole of the fastener. It is preferable that an insertion resistor for increasing the bolt penetration resistance is provided on the outer peripheral surface of the insertion pin.
- the insertion resistor is provided with an expansion resistance portion that is expanded in the radial direction in the vicinity of the middle in the longitudinal direction of the insertion pin or at a position behind the insertion pin.
- You may comprise so that a resistance groove
- the expansion resistance portion is formed in a tapered shape whose diameter decreases in the insertion direction, and the dimension on the front side in the insertion direction is fitted into the through hole to prevent the insertion pin from coming off. It may be formed on the outer diameter, and the dimension on the rear side in the insertion direction may be formed so that the pin insertion resistance due to friction with the through hole is larger than the bolt penetration resistance.
- the tip of the bolt main body is received by the expanding portion when the lower hole is inserted through the prepared hole in order to easily detect the timing when the expanding portion has completely passed through the prepared hole. It is preferable that the diameter is reduced with respect to the compressive force, and the material is formed of a material having an elastic force for restoring the radial direction after passing through the pilot hole.
- the driving resistance of the insertion pin can be reduced, and a stable high fastening force can be obtained by appropriately setting the balance between the size of the expanded portion and the wall thickness of the bolt.
- FIG. 1 is a front view showing an embodiment of a blind bolt 1 according to the present invention
- FIG. 2 is a side view seen from an arrow A in FIG. 1
- FIG. 3 is a sectional view taken along line 3B-3B in FIG. It is.
- the blind bolt 1 of the present embodiment includes a bolt body 2 having a through hole 21 formed on an axis, and an insertion pin 3 inserted into the through hole 21. It is composed of A slit 24 and an expanded portion 22 are formed at the front end portion 2a of the bolt body 2, and a male screw portion 23 is formed at the rear end portion 2b. A nut 5 is screwed onto the male screw portion 23 via a washer 4, and the fastened object Y is fastened to the fastener X by the nut 5 and the expanded portion 22.
- an expanded portion 22 that is expanded in the radial direction is formed.
- a slit 24 is formed along the axial direction in the front end 2 a including the expanded portion 22, and the slit 24 communicates with the through hole 21. As shown in FIG. 2, the slit 24 divides the front end 2a of the bolt body 2 into four substantially cross-shaped.
- the tip 2a of the bolt body 2 is reduced in diameter so as to be tapered, and the outer peripheral surface thereof is inclined in a tapered shape toward the tip. As a result, the width of the slit 24 gradually narrows toward the tip.
- the expanded portion 22 is formed in a pseudo quadrangle composed of four arc-shaped divided pieces 22a, 22a,. [0020] The diameter of the expanded portion 22 is reduced to such an extent that when inserted into the pilot hole h of the fastening object X and the fastened object Y, it can slide through the inner peripheral surface and be inserted with light resistance. ing.
- the expanded portion 22 is formed to have an outer diameter that is approximately 30% larger than the outer diameter (reference dimension) of the external thread portion 23, and then the diameter is reduced to the extent that it penetrates the pilot hole h with a light resistance.
- the width of the slit 24 is formed to be about 0.21-0.27 times the outer diameter of the external thread 23.
- the width of the slit 24 is determined within the range of about 0.21 to 0.27 times the outer diameter of the external thread 23 and based on the difference in diameter between the expanded portion 22 and the pilot hole h.
- the Normally, the pilot hole h is drilled 0.5 mm— 1. Omm larger than the bolt diameter (outer diameter of the male thread 23). It is determined.
- the reason for setting such a size is that the balance between the size of the expanded and expanded portion 22 and the width of the slit 24 for reducing the diameter is taken into consideration.
- the larger the expanded portion 22 is, the larger the area that is locked to the fastener X when it is expanded, but it is preferable to conversely to reduce the diameter reduction in order to pass through the pilot hole h.
- the slit 24 must be wide and cut.
- a large-diameter insertion pin 3 must be inserted, and the through hole 21 for this purpose must also be drilled.
- the wall thickness becomes thin.
- the rear portion of the distal end portion 2a from the expanded portion 22 is a co-rotation preventing portion 25.
- the co-rotation preventing portion 25 is formed to be approximately 0.7 mm larger than the outer diameter of the external thread portion 23.
- the state-rotating force insertion pin 3 is expanded, as shown in FIG.
- the swelled in the radial direction comes into contact with the pilot hole h of the fastener X.
- a longitudinal groove 25a is formed in the axial direction by a knurling on the outer peripheral surface of the co-rotation preventing portion 25 so that the frictional force with the pilot hole h can be increased.
- the vertical groove 25a prevents the blind bolt 1 from turning around when the nut 5 is tightened.
- the tip portion 2a composed of the expanded portion 22 and the co-rotation preventing portion 25 is reduced in diameter relative to the compressive force received by the expanded portion 22 when the pilot hole h of the fastener X is inserted. Together with pilot hole h It is formed of a material having an elastic force that is restored in the radial direction after being inserted. Examples include annealed iron and plastic materials.
- the insertion pin 3 is inserted into the through hole 21 of the bolt body 2 to expand the divided pieces 22a, 22a,. For this reason, the insertion pin 3 as a whole is smaller in diameter than the through hole 21 and slightly longer than the bolt body 2. Further, the tip of the insertion pin 3 is formed in a tapered shape so as to reduce driving resistance when entering the slit 24.
- a driving portion 31 having a large diameter is formed at the rear end of the insertion pin 3.
- the insertion pin 3 is held while being inserted into the bolt body 2.
- the insertion resistor 32 that can be fitted into the through hole 21 at the rear end of the bolt body 2 is the outer peripheral surface of the insertion pin 3. Is formed.
- the insertion resistor 32 is formed as a tapered expansion resistor 32a that gradually expands toward the rear end, and a resistance groove 33 is formed along the longitudinal direction. Yes.
- the resistance groove 33 may be formed obliquely with respect to the longitudinal direction of the insertion pin 3 so as to generate a higher V resistance.
- the outside dimension of the expansion resistance portion 32a is formed such that the portion on the front side in the insertion direction has an outer diameter that can be fitted into the through hole 21 to prevent the insertion pin 3 from coming off.
- the side portion is formed to have an outer diameter such that the pin insertion resistance force inserted into the through hole 21 is greater than the bolt insertion resistance force.
- the front side of the expansion resistance portion 32a in the insertion direction functions to prevent pin removal
- the rear side in the insertion direction functions to prevent pin insertion.
- the expansion resistance portion 32a may be formed in a radiating manner at an appropriate interval without being formed on the entire circumference of the insertion pin 3. Further, the insertion resistor 32 may be formed with a protrusion having an appropriate height on the insertion pin 3 to increase the resistance.
- a pilot hole h is drilled in the fastening object X and the fastening object Y.
- the bolt body 2 has an insertion pin 3 in the through hole 21. Inserted and held by the expansion resistance portion 32a so as not to fall out of the through hole 21.
- the tip 2a of the blind bolt 1 is inserted into the pilot hole h, and the driving portion 31 of the insertion pin 3 is tapped with a hammer.
- the insertion resistance force of the insertion pin 3 is larger than the bolt insertion resistance force, so the insertion bolt 3 is inserted into the pilot hole h without the insertion pin 3 being inserted.
- the tip 2a of the bolt body 2 is compressed in the axial direction by the pilot hole h, but is elastically deformed by the inertial force of the tip 2a (see FIG. 6). ), Proceed while sliding in contact with the pilot hole h (see Fig. 7)
- the expanded portion 22 passes completely through the pilot hole h, and the contact state with the pilot hole h is released. At this time, since the frictional force generated on the contact surface between the expanded portion 22 and the pilot hole h is eliminated, the operator senses that the expanded portion 22 has completely passed through the prepared hole h. Further, since the bolt body 2 is formed of a material having elasticity, the expanded portion 22 expands in the radial direction and is restored (see FIG. 8). As a result, the fastening position of the blind bolt 1 is determined, so that the operator can know the trigger for starting the insertion of the insertion pin 3.
- the washer 4 is brought into contact with the article Y to be fastened, and the nut 5 is temporarily tightened. This prevents the bolt body 2 from being inserted deeper into the pilot hole h than its position. If the insertion pin 3 is driven strongly in this state, the bolt body 2 is fixed by the nut 5, and therefore the expansion resistance portion 32a enters the through hole 21 while being crushed. Furthermore, as shown in FIG. 9, the insertion pin 3 enters the gap of the slit 24 and widens the tip 2a (see FIG. 9). At this time, since the slit 24 is formed so that the communication partial force with the through-hole 21 is tapered with a gentle slope, the insertion pin 3 easily expands the distal end portion 2a. As shown in FIG. 4, the expanded portion 22 of the tip 2a is expanded outwardly from the pilot hole h, and the co-rotation preventing portion 25 of the tip 2a contacts the inner peripheral surface of the pilot hole h. Touch.
- the insertion pin 3 when the insertion pin 3 is inserted into the through hole 21, the insertion pin 3 expands while being in contact with the tapered surface of the slit 24 formed to be tapered. Driving resistance can be reduced.
- the expanded portion 22 that does not prevent the insertion pin 3 from being pulled out by the frictional force between the outer peripheral surface of the tip portion 2a and the pilot hole h protrudes about 30% in the radial direction from the outer diameter of the screw portion 23. Since it abuts against the inner wall of the fastener X, a high fastening force can be obtained.
- the outer diameter of the expanded portion 22 is formed to be about 1.3 times the outer diameter of the male screw portion 23, and the width of the slit 24 is 0.21 to 0.27 of the outer diameter of the male screw portion 23. Since it is formed twice, the fastening force and the bolt strength suitable for the blind bolt 1 can be obtained in a well-balanced manner when the tip 2a is expanded.
- the expansion resistance portion 32a formed on the insertion pin 3 allows the insertion pin 3 to be held in the through hole 21 of the bolt body 2 so that it does not fall out. In order to prevent the inside of the through hole 21 from entering, the front end portion 2a of the bolt body 2 does not expand accidentally.
- blind bolt 1 of the present embodiment the optimum expansion diameter, slit width, insertion pin diameter, and pilot hole diameter values were obtained for each of the M6, M8, M10, M12, M16, M20, and M24 blind bolts 1 with different bolt diameters. It was. Figure 11 shows the numerical values.
- the diameter of the pilot hole h is only 0.5mm from the diameter of the external thread 23. The case where it forms large is assumed. According to the blind bolt 1 as described above, driving resistance is reduced and high fastening performance is exhibited.
- blind bolt 1 is not limited to the embodiment described above, but can be modified as appropriate.
- the slit 24 is formed in a substantially cross-shaped cross section, and the tip 2a of the bolt body 2 is divided into four equal parts.
- FIG. 1 is a front view showing an embodiment of a blind bolt according to the present invention.
- FIG. 2 is a side view as seen from arrow A in FIG.
- FIG. 3 is a cross-sectional view taken along line 3B-3B in FIG.
- FIG. 4A is a front view and FIG. 4B is a left side view showing a state in which an insertion pin is inserted into a through hole of a bolt body in the present embodiment and a tip portion is expanded.
- FIG. 5 is a view showing a state before the blind bolt of this embodiment is inserted into the prepared hole.
- FIG. 6 is a view showing a state where the tip of the blind bolt of this embodiment is elastically deformed.
- FIG. 7 is a view showing a state in which the blind bolt of the present embodiment is inserted into the prepared hole.
- FIG. 8 is a view showing a state in which the expanded portion of the blind bolt of the present embodiment has passed through the pilot hole.
- FIG. 9 is a view showing a state in which an insertion pin is driven in the blind bolt of the present embodiment.
- FIG. 10 is a view showing a state in which a nut in the blind bolt of the present embodiment is tightened.
- FIG. 11 is a table showing optimum values of examples in the present embodiment.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/017504 WO2006057039A1 (ja) | 2004-11-25 | 2004-11-25 | ブラインドボルト |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/017504 WO2006057039A1 (ja) | 2004-11-25 | 2004-11-25 | ブラインドボルト |
Publications (1)
Publication Number | Publication Date |
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WO2006057039A1 true WO2006057039A1 (ja) | 2006-06-01 |
Family
ID=36497788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/017504 WO2006057039A1 (ja) | 2004-11-25 | 2004-11-25 | ブラインドボルト |
Country Status (1)
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WO (1) | WO2006057039A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56160306U (ja) * | 1980-04-30 | 1981-11-30 | ||
JPH01154314U (ja) * | 1988-04-18 | 1989-10-24 | ||
JP2000283133A (ja) * | 1999-03-31 | 2000-10-13 | Misawa Homes Co Ltd | ファスナおよびファスナ用接合工具 |
JP2003130021A (ja) * | 2001-10-30 | 2003-05-08 | Koyo Kizai Kk | 拡開アンカーおよびその製造方法 |
JP2004147897A (ja) * | 2002-10-31 | 2004-05-27 | Iris Chitose Kk | 椅子の板材取付構造 |
JP2004332848A (ja) * | 2003-05-08 | 2004-11-25 | Koyo Kizai Kk | ブラインドボルト |
-
2004
- 2004-11-25 WO PCT/JP2004/017504 patent/WO2006057039A1/ja not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56160306U (ja) * | 1980-04-30 | 1981-11-30 | ||
JPH01154314U (ja) * | 1988-04-18 | 1989-10-24 | ||
JP2000283133A (ja) * | 1999-03-31 | 2000-10-13 | Misawa Homes Co Ltd | ファスナおよびファスナ用接合工具 |
JP2003130021A (ja) * | 2001-10-30 | 2003-05-08 | Koyo Kizai Kk | 拡開アンカーおよびその製造方法 |
JP2004147897A (ja) * | 2002-10-31 | 2004-05-27 | Iris Chitose Kk | 椅子の板材取付構造 |
JP2004332848A (ja) * | 2003-05-08 | 2004-11-25 | Koyo Kizai Kk | ブラインドボルト |
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