JP2005351433A - Nut for tightening - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nut for tightening having excellent strength and capable of obtaining stable tightening force in a short time always. <P>SOLUTION: This nut for tightening is composed of a cylindrical body 2 having a screw-fitting screw part 1 at the inner periphery, a reverse conical part 3 provided at a terminal on the opposite side for preceding screw-fitting so as to enlarge outside diameter sequentially from the halfway of an outer peripheral face of the cylindrical body, a collar part 4 provided by protruding in the peripheral direction from a peripheral fringe part having the maximum diameter of the reverse conical part, an engaging part in which a bit of an impact wrench provided on a terminal face of the reverse conical part is detachably fitted and engaged, a plurality of first cutting blades 6 provided toward a section having the maximum diameter from a section having the minimum diameter of a peripheral face of the reverse conical part and inclined forward from the direction of rotation, and a second cutting blade 7 continuous with the first cutting blade and provided by inclining backward in the direction of rotation toward a peripheral fringe of a rear face of the collar part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tightening nut that is screwed into, for example, an anchor bolt erected on foundation concrete to tighten a foundation on the foundation concrete.

  Insert the anchor bolt standing on the foundation concrete into the through hole of the foundation and place the foundation on the foundation concrete, and then screw the tightening nut into the anchor bolt and the end of the tightening nut (on the opposite side of the screwing direction) The engagement portion of the flange portion on the end) side or the inverted conical portion is engaged with the engagement portion of the electric impact wrench, and the tightening nut is screwed while forcibly rotating under this engagement relationship.

  At that time, the base is tightened and fixed to the foundation concrete while the base is cut with the cutting blade provided on the base and the inverted conical part, while the base and the conical part are embedded in the cutting recess on the top surface of the base. (For example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4).

JP 2002-168223 A JP 2003-106322 A Japanese Patent No. 3007297 Japanese Patent No. 2929576

  By the way, the thing of the structure which consists of a washer and a nut part cannot thicken the thickness of a washer (the actual thing is about 4.5 mm-about 5 mm) in order to dig a washer on a base.

  The reason is that if the thickness of the washer is increased in order to give strength, the digging becomes deeper and it takes time.

  On the other hand, if the time is shortened by shallowing the counter digging, the strength is not strong, and the engaging portion becomes shallow and the bit is likely to come off.

  Accordingly, the thickness of the connecting portion between the nut portion and the washer is thin, and in some cases, the collar portion may be broken with respect to the nut portion, which is a common cause of neck skipping.

  In addition, when the tip of the bolt is positioned 5 mm to 10 mm below (on the foundation concrete side) with respect to the upper surface of the base, the stress applied to the heel portion is large, and there is a problem in earthquake resistance.

  Furthermore, a triangular pyramid-shaped space is present in front of the circumferential blade in the rotational direction, and the presence of this allows the chips during the digging to be discharged.

  However, since the thickness of the peripheral space of the buttock is extremely thin, the cause of the shark due to the stress on the buttock (because the wall thickness of the connecting part between the nut and washer is thin, and the cause of the neck jump Also become).

  The engagement between the impact wrench and the heel part during construction is poor even if the impact wrench can be set on the vertical line of the bolt. Even more dangerous and time consuming.

  The cause is the engagement between the dowel and the dowel hole, that is, the catch.

  Moreover, the thing of the combined structure of the cylindrical part which has a screw hole, and the reverse cone-shaped collar part which has a cutting blade makes the cutting blade gradually low toward the outer peripheral direction (the degree of protrusion is made small sequentially). Therefore, the outer peripheral portion of the nut heel portion is completely opposite to the effect of performing the digging function. In other words, the collar functions as a stopper and the nut does not enter. Even if it enters, it takes 2-4 times.

  That is, the pitch of the bolt is normally P = 1.75, and the protruding height of the cutting blade around the cylindrical portion is about 1.5 mm. However, the impact wrench suddenly stops when the upper surface of the heel part is about 3 to 5 mm from the upper surface of the base (the outer periphery of the heel part serves as a stopper that prevents the function of boring wood).

  That is, the cutting blade is positioned behind the screwing direction (the cutting blade is slightly spiraled).

  Then, it is quite counterproductive to fulfilling the function as a bowling.

  The reason is that the backward and spiral shape from the rotation direction is intended to allow the wood chips to flow in the direction opposite to the direction of rotation of the nut. At the beginning of rotation, the wood chips move backward, but the cutting blade is spiral. Since the moving distance is long and the height of the cutting blade is low, the wood chips are compressed and the discharge is stopped.

  Then, this invention is providing the nut for fastening used mainly for fixing the concrete foundation and foundation of a wooden house which solved each said problem.

  In order to solve the above-described problems, the present invention has a cylindrical body having a threaded screw portion on the inner periphery, and the outer diameter is sequentially increased from the middle of the outer peripheral surface of the cylindrical body to the opposite end of the threading front. The reverse cone part provided in this way, the flange part protruding in the circumferential direction from the peripheral part of the maximum diameter of the reverse cone part, and the bit of the impact wrench provided on the end face of the reverse cone part are detachably fitted. From the engaging portion to be engaged, a plurality of first cutting blades inclined forward from the rotational direction provided from the peripheral surface minimum diameter portion to the maximum diameter portion of the inverted conical portion, and the first cutting blade The structure which consists of the 2nd cutting blade which inclined and provided in the back in the rotation direction toward the back surface periphery of the said collar part continuously is employ | adopted.

  Further, the engaging portion has a circular recessed hole formed inwardly from the end surface of the inverted conical portion, and a plurality of strips provided along the shaft core at circumferentially equal positions of the recessed hole. There are also cases where it is constituted by a vertical groove, or a planar polygon provided inward from the end face of the inverted conical portion, and a ring-shaped recessed groove.

  As described above, according to the tightening nut of the present invention, since the flange portion is provided so as to protrude in the circumferential direction from the peripheral portion of the maximum diameter of the inverted conical portion, the flange portion is formed on the thick portion of the inverted cone portion. Is connected, and the strength is greatly increased, so that the buttock is not torn off, and the tip position of the anchor bolt can be seen from the safety. The stress is relieved (accepted) to the inverted conical part, and there is no problem with earthquake resistance.

  Of course, the pressurization area of the foundation is also greatly increased at the heel and inverted cone, enabling stable fixation, and the inverted cone bites into the foundation in a wedge shape, so it can withstand expansion and contraction of the foundation. As a result, the nut is not loosened, and a stable tightening force can always be obtained.

  In addition, since the wood chips cut by the first cutting blade are transported down and discharged into the through-hole of the base, the cutting of the recessed portion into which the inverted conical portion is fitted without any clogging of the wood chips is smooth and short. In addition to being able to perform well in time, the second cutting blade cuts the indented portion of the buttock on the upper surface of the base and pushes and releases the wood chips accompanying the cutting in the discharge direction. There is no stopping.

  As a result, the tightening nut can be attached stably and in a short time.

  Further, the dowel and the dowel hole are formed by the recess hole and the vertical groove on the inner periphery of the recess hole, and the ring-shaped recess groove forms an engaging portion for engaging the rotational drive side bit. Unlike the engagement relationship such as (hole), a secure engagement relationship is achieved without detaching the bit.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In the first embodiment of the present invention, as shown in FIG. 1 to FIG. Are provided with an inverted conical portion 3 that gradually increases in outer diameter.

  Moreover, the collar part 4 which protrudes in the circumferential direction from the periphery of the largest diameter of the reverse cone part 3 is provided.

  Further, an engagement portion 5 for removably inserting and engaging a bit (not shown) of an impact wrench is provided on the end surface of the inverted conical portion 3.

  A plurality of first cutting blades 6 that are inclined forward from the rotational direction from the smallest peripheral surface portion of the inverted conical portion 3 toward the maximum diameter portion (the connecting portion of the flange portion 4) are provided. The 2nd cutting blade 7 which continued from 6 and was made to incline back in the rotation direction toward the back surface periphery of the collar part 4 is provided.

  The tightening nut A configured as described above is formed by forging.

Next, a method of use is described. First, as shown in FIG. 5, a base 12 (wooden) is placed on the foundation concrete 11.

  At that time, anchor bolts 13 erected from the foundation concrete 11 are inserted into the through holes 14 of the base 12.

  The diameter of the through hole 14 is set to be somewhat larger than the diameter of the anchor bolt 13, and there is a space for dropping wood (for escape) between the through hole 14 and the anchor bolt 13.

  Of course, the cylindrical body 2 of the tightening nut A can be inserted into the through hole 14.

  As shown in FIG. 5, when the lead portion 15 of the anchor bolt 13 is provided on the inner peripheral edge portion of the screwing leading end of the tubular body 2, the tubular body 2 can be easily fitted to the anchor bolt 13. At the same time, the biting at the start of screwing becomes smooth.

  In addition, although the above-mentioned engaging part 5 showed the hexagonal square hole which the hexagonal square axis of the commercially available bit (illustration omitted) of an impact wrench fits and engages in an engagement state in the case of illustration, it is limited. For example, a tab hole and a tab may be used.

  Thus, after engaging the bit of the impact wrench with the engaging portion 5, the tightening nut A is rotated in one direction while operating the impact wrench under the condition of the engagement.

  Then, while the cylindrical body 2 having the threaded portion 1 is screwed into the anchor bolt 13 and is moved downward in FIG. 5, first, the first cutting blade 6 of the inverted conical portion 3 is first placed on the upper edge of the through hole 14. The upper cone part of the through-hole 14 is abutted and cut, and the inverted conical part 3 is inserted into the inverted conical hole B accompanying the cutting.

  The cutting waste from the first cutting blade 6 is fed in the center direction, and the fed cutting waste falls (falls down) into the through hole 14.

  And when the 2nd cutting blade 7 of the collar part 4 contact | abuts on the upper surface of the base 12, while cutting the upper surface of the base 12 with the 2nd cutting blade 7, while forming the recessed step part C in the upper surface of the base 12, The flange 4 is fitted into the recessed step C.

  As a result, the base 12 pressed by the inverted conical portion 3 and the flange portion 4 on the foundation concrete 11 is fixed as shown in FIG.

  Cutting along with the fixing is smoothly performed by the first cutting blade 6 and the second cutting blade 7, and the cutting is fast due to the drill function by the first cutting blade 6 of the inverted conical portion 3.

  The cutting waste produced by the second cutting blade 7 is sent out in the circumferential direction of the flange 4 and discharged.

  In addition, although the 1st cutting blade 6 was radial and arrange | positioned in the case of illustration in the position of three equal parts, the number of minutes is not limited.

  As a result, the wood chips move backward at the beginning of rotation, as in the method intended to flow the wood chips in the direction opposite to the direction of rotation of the nut, but the moving distance is long because the cutting blade is spiral, and It is possible to eliminate the inconvenience that the generated wood chips are compressed and the discharge is stopped because the height of the cutting blade is successively lowered.

  The contact area of the tightening nut with the base also consists of the lower surface of the flange portion 4 and the peripheral surface of the reverse cone portion 3, and the reverse cone portion 3 bites in a wedge shape so that it can withstand expansion and contraction of the base (wood). The tightening nut will not loosen and the tightening force will not change. In other words, a stable foundation can be established.

  In addition, by making the engaging portion 5 into a polygonal hole, the fitting fit of the square shaft of the bit is ensured, and there is no detachment due to slight lifting such as the engagement between the tab hole and the tab. , Improve worker safety.

  Further, since the flange portion 4 is connected to the peripheral edge of the large diameter side of the inverted conical portion 3 and protrudes in the circumferential direction, the connecting portion of the flange portion 4 is caused by the large diameter side thick wall of the reverse cone portion 3 when screwed. The neck jump is not torn off, and the large stress applied to the buttocks 4 is withstood and contributes to earthquake resistance.

  In the second embodiment of the present invention, as shown in FIG. 6, the engaging portion 5 has a circular recessed hole 21 facing inward from the center of the end surface of the inverted conical portion 3, and the recessed hole 21. It is formed with a plurality of longitudinal grooves 22 provided along the axis at equal circumferential positions.

  Of course, the bit of the impact wrench also has a shape (not shown) that fits into the recessed hole 21 having the longitudinal groove 22.

  Then, the bit is a round shaft, and it is only necessary to have a protrusion that fits into the outer peripheral surface of the bit so as to transmit rotation to the vertical groove 22.

  In the third embodiment of the present invention, as shown in FIG. 7, the engaging portion 5 is a planar polygonal annular recess 31 provided inward from the center of the end surface of the inverted conical portion 3. Form.

  The recessed groove 31 is not limited to the illustrated hexagon, and may be a quadrangle, for example.

  Then, the bit can be manufactured by cutting the square pipe and the cost is reduced.

The perspective view which shows 1st Embodiment of this invention Longitudinal front view Bottom view Plan view Longitudinal enlarged front view showing mounting of foundation The top view which shows 2nd Embodiment The top view which shows 3rd Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw part 2 Cylindrical body 3 Reverse cone part 4 Gutter part 5 Engagement part 6 1st cutting blade 7 2nd cutting blade 21 Recessed hole 22 Vertical groove 31 Recessed groove

Claims (3)

A cylindrical body having a threaded screw portion on the inner periphery, an inverted conical portion provided so that the outer diameter is successively increased from the middle of the outer peripheral surface of the cylindrical body to the opposite end before the threading, and the inverted conical portion A flange portion projecting in the circumferential direction from the peripheral portion of the maximum diameter, an engagement portion for removably inserting and engaging a bit of an impact wrench provided on the end face of the reverse cone portion, A plurality of first cutting blades inclined forward from a rotation direction provided from the peripheral surface minimum diameter portion toward the maximum diameter portion, and the rotation direction toward the back surface periphery of the collar portion connected to the first cutting blade. A tightening nut comprising a second cutting blade provided to be inclined rearward. A circular recessed hole formed by the engaging portion inward from the end surface of the inverted conical portion, and a plurality of vertical grooves provided along the axial center at equal intervals around the circumferential surface of the recessed hole The tightening nut according to claim 1, wherein: 2. The tightening nut according to claim 1, wherein the engaging portion is a planar polygon that is provided inward from an end surface of the inverted conical portion, and is configured by a ring-shaped recessed groove.

Images