JP3137666U - Tightening nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tightening nut which has excellent strength and can always obtain a stable tightening force in a short time.
SOLUTION: A cylindrical body 2 having a threaded screw portion 1 on the inner periphery, and 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. 3, an engagement part that detachably fits and engages a flange part 4 provided so as to protrude in the circumferential direction from the peripheral part of the maximum diameter of the reverse cone part and a bit of an impact wrench provided on the end face of the reverse cone part And a plurality of first cutting blades 6 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 7 inclined and provided in the back in the rotation direction toward the back surface periphery of a part is employ | adopted.
[Selection] Figure 1

Description

  The present invention relates to a tightening nut that is screwed into, for example, an anchor bolt erected on foundation concrete and fastens a foundation to 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 by the cutting blade provided on the base and the inverted conical part, and 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).

  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.

  In view of this, the present invention is to provide a tightening nut mainly used for fixing a concrete foundation and a foundation of a wooden house, which solves each of the above problems.

  In order to solve the above-mentioned problems, the present invention has a cylindrical body having a threaded screw portion on the inner periphery, and the outer diameter is successively 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.

  As described above, according to the tightening nut of the present invention, the flange portion is provided so as to protrude in the circumferential direction from the peripheral portion of the maximum diameter of the inverted cone portion, so that 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, and it is applied to the buttock even if it is below the upper surface of the base due to installation work efficiency. 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.

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

In the embodiment of the present invention, as shown in FIGS. 1 to 4, the cylindrical body 2 having the threaded screw portion 1 on the inner surface is continuously removed in the distal direction from the middle of the outer peripheral surface of the cylindrical body 2 to the opposite end of the preceding threading. An inverted conical portion 3 having a large diameter is provided.
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.

  Furthermore, 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, the usage method will be 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 cut by contact, 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.

It is a perspective view which shows embodiment of this invention. It is a longitudinal front view same as the above. It is the same bottom view. It is the same top view. It is a vertical expansion front view which shows attachment of a foundation.

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

Claims (1)

  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.

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