JP2006167894A - Double nut fastening tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double nut fastening tool capable of fastening two nuts different in pitches on a double screw structured bolt and remarkably improving efficiency of fastening work. <P>SOLUTION: This double nut fastening tool 10 is furnished with a roughly cylindrical clutch part 11 to hold the nut N1 for fastening, a roughly cylindrical socket part 12 arranged on the clutch part 11 by commonly having a shaft center and to hold the nut N2 for locking and a housing 13 in which the clutch part 11 and the socket part 12 are stored free to relatively rotate and is constituted free to independently rotate the socket part 12 from the clutch part 11. Consequently, nonconformity to fasten the nut for locking is solved after fastening the fastening nut on a looseness preventive bolt in fastening these nuts on the looseness preventive bolt. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a double nut tightening tool, and more particularly to a double nut type tightening tool for tightening two types of nuts having different pitches on a locking screw having a double screw structure.

  Conventionally, bolts and nuts are widely used when two workpieces are fastened as materials to be fastened. In particular, bolts and nuts used in vibrated parts are inevitable to loosen due to vibration. Therefore, conventionally, a double nut structure has been adopted in which two nuts are fastened to a single bolt as a fastening nut and a locking nut, and the locking nut has been prevented from loosening. However, even in the double nut structure, the two nuts have the same pitch, so once the nuts are loosened due to vibration or impact, the two nuts can rotate freely in the bolts, so it is not always perfect as a prevention of loosening. It wasn't.

  Therefore, Patent Document 1 proposes a loosening prevention bolt that solves the above-described problems. The loosening prevention bolt has a double screw structure in which two types of male screws having different pitches are formed on one bolt. Then, a tightening nut corresponding to two types of male screws and a locking nut are sequentially tightened on a double screw structure bolt to reliably prevent the nut from rotating together due to vibration, impact, or the like.

JP 2003-184848 A

However, although Patent Document 1 proposes a loosening prevention bolt, there is no description about a tool for fastening a tightening nut and a locking nut to the loosening prevention bolt. Therefore, when tightening these nuts to the loosening prevention bolts, as with the conventional double nut structure, after tightening the tightening nuts to the loosening prevention bolts, the loosening prevention nuts must be tightened to prevent loosening. However, there is a problem that the tightening process of the nut twice is necessary, the tightening process is complicated, and the work efficiency is poor.

  The present invention has been made in order to solve the above-described problem, and can tighten two types of nuts having different pitches on a bolt having a double screw structure in a single operation, thereby greatly improving the efficiency of the tightening operation. An object of the present invention is to provide a double nut tightening tool that can be used.

The double nut tightening tool according to claim 1 of the present invention is a double nut tightening tool for tightening each of a first nut having a coarse pitch and a second nut having a fine pitch to a bolt having a double screw structure, A substantially cylindrical clutch portion that holds the first nut, a substantially cylindrical socket portion that shares the shaft core and holds the second nut on the clutch portion, the clutch portion, and the socket The housing includes a housing that is housed so as to be relatively rotatable.

The double nut tightening tool according to claim 2 of the present invention is the invention according to claim 1, wherein a clutch mechanism is provided between the clutch part and the socket part to connect and release both of them. In addition, the clutch machine mechanism is configured such that the connection with the clutch portion is released, and the socket portion is configured to be rotatable independently of the clutch portion.

According to a third aspect of the present invention, in the double nut tightening tool according to the first or second aspect of the present invention, the clutch mechanism is provided in any one of the clutch portion and the socket portion in the circumferential direction. A plurality of recesses formed at predetermined intervals, balls elastically stored in these recesses, and either the clutch portion or the socket portion are formed at predetermined intervals in the circumferential direction. In addition, each of the balls has a plurality of groove portions into which the balls are elastically fitted.

  The double nut tightening tool according to claim 4 of the present invention is the invention according to any one of claims 1 to 3, wherein the holding portion for holding the first nut is the clutch portion. A holding portion for holding the second nut has a plurality of balls arranged so as to protrude from the inner peripheral surface at equal intervals in the circumferential direction of the inner peripheral surface, and a holding portion for holding the second nut is provided on the inner peripheral surface of the socket portion. It has a plurality of balls arranged to protrude from the inner peripheral surface at equal intervals in the circumferential direction.

According to the first to fourth aspects of the present invention, two types of nuts having different pitches can be fastened to a bolt having a double screw structure by a single operation, and the efficiency of the tightening work is greatly improved. A double nut tightening tool that can be provided can be provided.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS. 1 is a sectional view showing the relationship between a double nut tightening tool and a double screw structure bolt according to an embodiment of the present invention, and FIG. 2 is a double screw using the double nut tightening tool shown in FIG. FIG. 3 is a cross-sectional view showing a state in which a double nut is tightened on a bolt having a structure, FIG. 3 is a cross-sectional view showing a clutch portion of the double nut tightening tool shown in FIG. 1, (a) is a plan view seen from above, and (b). 4 is a sectional view, FIG. 4 is a sectional view showing a socket portion of the double nut fastening tool shown in FIG. 1, (a) is a plan view seen from above, (b) is a sectional view, and (c) is a through hole. FIG.

  As shown in FIG. 1, for example, the double nut tightening tool 10 of the present embodiment includes a first nut (hereinafter referred to as “fastening”) with a loose pitch preventing bolt B having a double screw structure inserted into the workpieces W1 and W2. N1 and a second nut with a fine pitch (hereinafter referred to as a “loosening prevention nut”) N2 and a tool for tightening both N1 and N2 in one operation. It is.

  That is, as shown in FIG. 1, the double nut tightening tool 10 of the present embodiment is arranged with a substantially cylindrical clutch portion 11 that holds a fastening nut N1 and a shaft center shared on the clutch portion 11. And a substantially cylindrical socket portion 12 that holds the nut N2 for preventing loosening, and a housing 13 in which the clutch portion 11 and the socket portion 12 are housed so as to be relatively rotatable. A clutch mechanism 14 is provided between the clutch part 11 and the socket part 12 to connect both the parts 11 and 12 and release the connection. The clutch mechanism 14 is connected to the socket part 12 and the clutch part 12 as described later. When the part 11 is connected, the rotational force of the socket part 12 is transmitted, and when the connection between the both parts 11 and 12 is released, only the socket part 12 rotates.

As shown in FIGS. 1 and 3 (a) and 3 (b), the clutch portion 11 has a cylindrical small-diameter portion 11A and a cylindrical shape continuously connected to the cylindrical small-diameter portion 11A so as to share an axis. It has a large diameter portion 11B and a horizontal step portion 11C formed along the inner peripheral surface as a boundary between these both 11A and 11B. The cylindrical small diameter portion 11A holds the fastening nut N1, and the cylindrical large diameter portion The socket portion 12 is held in 11B. That is, the cylindrical small-diameter portion 11A is formed as a holding portion for the fastening nut N1, and the inner diameter thereof is formed slightly larger than the maximum dimension of the plane of the fastening nut N1, and the inner diameter of the cylindrical large-diameter portion 11B is the socket portion 12. It is formed in a size that can accommodate the lower part of the. Therefore, hereinafter, the cylindrical small-diameter portion 11A of the clutch portion 11 is referred to as a holding portion 11A as necessary.

  The cylindrical small-diameter portion 11A has through holes 11D formed at, for example, three positions spaced by 120 ° in the circumferential direction, and balls 11E for gripping the fastening nuts N1 are accommodated in these through holes 11D, respectively. ing. These through holes 11D are formed at the same height from the lower end of the cylindrical small-diameter portion 11A, and the ball 11E jumps out of the through-hole 11D to the inside of the cylindrical small-diameter portion 11A by the reduced diameter portion formed at each inner end. It is supposed not to. A part of these balls 11E protrudes from the inner peripheral surface of the cylindrical small-diameter portion 11A, and contacts the three end portions of the fastening nut N1 in the cylindrical small-diameter portion 11A when the clutch portion 11A rotates. Thus, the fastening nut N1 is grasped and rotated, and is further restrained in the through hole 11D by the housing 13. The fastening nuts N1 clamped by the three balls 11E are configured such that the end portions of the three side surfaces come into contact with the three balls 11E in the cylindrical small-diameter portion 11A and can rotate only a slight angle. .

Further, the lower portion of the socket portion 12 is accommodated in the cylindrical large diameter portion 11B, the lower end of the socket portion 12 is supported by the horizontal step portion 11C, and the socket portion 12 is rotatably held by the cylindrical large diameter portion 11B. ing.

  As shown in FIGS. 1 and 4 (a) to 4 (c), the socket portion 12 has a cylindrical large-diameter portion 12A and a cylinder that is continuously connected to the cylindrical large-diameter portion 12A so as to share an axis. A small diameter portion 12B and a flange portion 12C which is formed on the upper portion of the cylindrical large diameter portion 12A so as to have a larger diameter and incorporates the operating portion of the clutch mechanism 14. The cylindrical large diameter portion 12A is used to prevent loosening. The nut N2 is grasped and connected to the clutch portion 11 via the clutch mechanism 14 or the connection to the clutch portion 11 is released. A holding part 12D of a locking nut N2 is configured at the lower part of the cylindrical large diameter part 12A in the same manner as the cylindrical small diameter part 11A of the clutch part 11, and the inner diameter of the holding part 12D is the maximum dimension of the locking nut N2. It is formed slightly larger. The outer diameter of the cylindrical large-diameter portion 12A is slightly smaller than the inner diameter of the cylindrical large-diameter portion 11B of the clutch portion 11, and the cylindrical large-diameter portion 11A is fitted into the cylindrical large-diameter portion 12A. It is like that. Further, the upper end of the holding portion 12D of the cylindrical large-diameter portion 12B is formed with a reduced horizontal step portion over the entire circumference, and this horizontal step portion is formed as a locking portion 12E of the locking nut N2. .

  Further, as shown in FIG. 1, the holding portion 12D of the cylindrical large-diameter portion 12A and the holding portion 11A of the clutch portion 11 are formed to have substantially the same inner diameter, and the locking nut N2 is held from the holding portion 12D. It is formed so as to come out via the part 11A. And these holding | maintenance part 11A, 12D advances the fastening nut N1 fast along the loosening prevention bolt B, when fastening the fastening nut N1 and the locking nut N2 with respect to the loosening prevention bolt B together. When the fastening nut N1 is released from the ball 11E of the holding portion 11A and released from the holding portion 11A when it is separated from the locking nut N2 by a predetermined distance, the clutch portion 11 is fastened by the action of the clutch mechanism 14 as will be described later. Rotate together with the socket portion 12 without tightening the nut N1 and tighten only the locking nut N2, and when the socket portion 11 moves along the loosening prevention bolt B, the ball 11E of the clutch portion 11 is again fastened. The nut N1 is grasped and both nuts N1 and N2 are temporarily tightened at the same time, and this operation is repeated thereafter.

  As shown in FIGS. 1 and 4 (a) to 4 (c), the holding portion 12D of the cylindrical large-diameter portion 12A is spaced apart by 120 ° in the circumferential direction like the holding portion 11A of the clutch portion 11. Through holes 12F are formed in the respective through holes 12F, and balls 12G for gripping the locking nuts N2 are housed in the respective through holes 12F. These balls 12G are sealed in the through hole 12F by the reduced diameter part of the inner end of the through hole 12F and the cylindrical large diameter part 11B of the clutch part 11. When the socket portion 12 is rotated, the nuts N2 for preventing loosening held by the three balls 12G are rotated by a slight angle when the end portions of the three side surfaces contact the three balls 12G in the holding portion 12D. I can't do it. These balls 12G are arranged so as to be shifted from the balls 12E of the clutch portion 11 by 60 ° in the circumferential direction.

  The outer diameter of the flange portion 12 </ b> C is formed to be substantially the same as the outer diameter of the cylindrical large diameter portion 11 </ b> B of the clutch portion 11, and both of them form an outer peripheral surface slightly smaller than the inner diameter of the housing 13. As shown in FIG. 1, the housing 13 includes a housing main body 13A and a reduced diameter portion 13B connected to the lower end of the housing main body 13A. The clutch portion 11 and the socket portion 12 are accommodated in the housing main body 13A. The lower surface outside the cylindrical large diameter portion 11B of the clutch portion 11 is supported by a horizontal step portion 13C formed at the boundary between the housing main body 13A and the reduced diameter portion 13B, and the cylindrical small diameter portion 11A of the clutch portion 11 is supported. Protrudes in contact with the reduced diameter portion 13B. Therefore, the clutch part 11 and the socket part 12 are accommodated in the housing 13 without rattling.

  Moreover, as shown to (a)-(c) of FIG. 1, FIG. 4, the screw part 12H penetrated in the up-down direction is formed in the flange part 12C, for example in three places opened at 120 degree | times to the circumferential direction, A clutch mechanism 14 is built in the screw hole 12H.

  That is, the clutch mechanism 14 includes three screw holes 12H and adjustment screws 14A that are screwed at the top thereof, coil springs 14B that are respectively housed in recesses formed below by these adjustment screws 14A, Clutch balls 14C urged downward by the coil springs 14B, and the cylindrical large-diameter portion of the clutch portion 11 so that these balls 14C are elastically fitted to connect the socket portion 12 and the clutch portion 11, respectively. 11B, and 12 clutch grooves 14D formed on the upper end surface of the coil 11B. The elasticity of the coil spring 14B is adjusted by the adjusting screw 14A in accordance with the type of the fastening nut N1 and the locking nut N2. The urging force of the service ball 14C can be adjusted. These clutch grooves 14D are formed more than the number of clutch balls 14C.

  When the fastening nut N1 and the locking nut N2 are tightened together with the loosening prevention bolt B, the clutch ball 14C of the clutch mechanism 14 is fitted into the clutch groove 14D from the socket portion 12 side, and the socket portion 12 and the clutch In this state, the torque of the socket portion 12 is transmitted to the clutch portion 11. Further, when the fastening of the fastening nut N1 by the clutch part 11 is finished and the fastening of the locking nut N2 by the socket part 12 is not finished, the clutch part 11 repeats the clutch on and the clutch off while the clutch part 11 repeats the clutch on and the clutch off. Only the locking nut N2 is fastened.

  That is, when the tightening of the fastening nut N1 is finished in a state of being separated from the locking nut N2, the clutch portion 11 grips the fastening nut N1 and does not rotate any more. Overcoming the urging force of the coil spring 14B, the clutch ball 14C rides up from the clutch groove 14D to the upper end surface of the cylindrical large-diameter portion 11B of the clutch portion 11, enters the clutch-off state, and only the socket portion 12 rotates. Tighten only the locking nut N2. Even when the clutch ball 14C is reinserted into the clutch groove 14D and the clutch is turned on, the rotational force of the socket portion 12 exceeds the urging force of the coil spring 14B. Tighten. The clutch mechanism 14 is repeatedly turned on and off until the tightening of the locking nut N2 is completed. When the locking nut N2 comes into contact with the fastening nut N1 and the tightening of the locking nut N2 is finished, the socket part 12 does not rotate any more, and the fastening of both the fastening nut N1 and the locking nut N2 is finished. It will be done.

  A collar member 15 is mounted on the top surface of the flange portion 12C, and the collar member 15 covers the top surface of the flange portion 12C. The inner diameter of the collar member 15 is slightly larger than the outer diameter of the cylindrical small diameter portion 12 </ b> B, and the outer diameter is slightly smaller than the inner diameter of the housing 13. Further, a groove is formed on the inner peripheral surface of the upper end portion of the housing 13 over the entire circumference with a slight gap between the collar member 15 and a stop ring 16 is mounted in the groove. The stop ring 16 prevents the clutch part 11 and the socket part 12 mounted in the housing 13 from coming out of the housing 13.

  Furthermore, a connecting hole 12I for connecting an operating tool (not shown) for operating the double nut tightening tool 10 is formed in the upper portion of the socket portion 12. The connecting hole 12I is formed in a substantially square shape in plan view so that the double nut fastener 10 can be rotated by connecting the operating tool. The operation tool may be a manual method or an electric method. Therefore, when operating the double nut tightening tool 10, the connecting portion of the operating tool is inserted into the connecting hole 12I of the socket portion 12, and the operating tool and the double nut tightening tool 10 are connected to each other via the operating tool. The double nut fastener 10 is rotated, and the fastening nut N1 and the locking nut N2 are respectively fastened to the locking bolt B by a single operation.

  Next, one usage mode of the double nut tightening tool 10 of the present embodiment will be described. First, for example, after the fastening nut N1 is attached to the loosening prevention bolt B attached to the workpieces W1 and W2 shown in FIG. 1, the locking nut N2 is attached. Next, the holding portions 11A and 12D of the double nut tightening tool 10 are fitted to the upper and lower nuts N2 and N1.

  Thereafter, after the operating tool is connected via the connecting hole 12I of the double nut tightening tool 10, and the double nut tightening tool 10 is rotated using the operating tool, the fastening nut N1 and the loosening prevention bolt B are obtained. Screw along the loosening prevention bolt B at the same time. At this time, since the fastening nut N1 has a coarser pitch than the locking nut N2, the fastening nut N1 advances faster than the locking nut N2 and gradually moves away from the locking nut N2, and the fastening nut N1 holds the clutch portion 11. Depart from part 11A. Then, the clutch part 11 rotates together with the socket part 12, and tightens only the locking nut N2.

  When the fastening of the locking nut N2 is advanced by the socket 12, the clutch portion 11 again engages with the fastening nut N1, grasps the fastening nut N1, and fastens the fastening nut N1 and the locking nut N2 together. When tightening of the fastening nut N1 and the locking nut N2 proceeds while intermittently stopping tightening of only the fastening nut N1 while the locking nut N2 is continuously tightened in this way, the fastening nut is finally reached. The tightening of N1 ends as shown in FIG. When the tightening of the fastening nut N1 is completed, the clutch portion 11 does not rotate any further, and the loosening prevention nut N2 is tightened only by the socket portion 12 while the clutch mechanism 14 is repeatedly turned on and off. When the tightening of the locking nut N2 is finished, the tightening of both nuts N1 and N2 is completed. When the fastening nut N1 and the locking nut N2 have been tightened, the double nut fastening tool 10 can be easily removed from the nuts N1 and N2 even if the end faces between the nuts N1 and N2 are not aligned. Can do.

  As described above, according to the present embodiment, the substantially cylindrical clutch portion 11 that holds the fastening nut N1 with a coarse pitch, and the shaft core is shared on the clutch portion 11 and the pitch is loose. Since it has a substantially cylindrical socket portion 12 for holding the locking nut N2, and a housing 13 in which the clutch portion 11 and the socket portion 12 are housed so as to be relatively rotatable, a fastening nut N1 and a locking nut N2 are provided. Can be tightened together in a single operation against the anti-loosening bolt B, and there is no need for the complicated tightening operation of tightening the fastening nut and the locking nut in two steps as in the past. The tightening work efficiency can be greatly increased.

  Further, according to the present embodiment, the clutch mechanism 14 is provided between the clutch portion 11 and the socket portion 12 to connect and release the both 11 and 12, and the clutch machine mechanism 14 is connected to the clutch portion 11. Since the socket portion 12 is configured to be rotatable independently of the clutch portion 11, after the fastening nut N1 is tightened, the clutch mechanism 14 is repeatedly turned on and off to repeatedly turn the nut N2 for preventing loosening. These nuts N1 and N2 can be securely tightened against the loosening prevention bolt B.

  Further, according to the present embodiment, the clutch mechanism 14 includes three concave portions formed at predetermined intervals in the circumferential direction on the flange portion 12C of the socket portion 12, and coil springs housed in these concave portions. 14B, a clutch ball 14C elastically biased by these coil springs 14B, and a clutch ball formed on the upper end surface of the cylindrical large-diameter portion 11B of the clutch portion 11 at a predetermined interval in the circumferential direction. 14C has twelve clutch groove portions 14D into which each of them is elastically fitted. Therefore, even after tightening the fastening nut N1 to the loosening prevention bolt B, only the loosening prevention nut N2 is fastened to the loosening prevention bolt B. The nuts N1 and N2 can be securely tightened to the loosening prevention bolt B.

  In addition, according to the present embodiment, the holding portion that holds the fastening nut N1 is disposed so as to protrude from the inner peripheral surface at equal intervals in the circumferential direction of the inner peripheral surface of the holding portion 11A of the clutch portion 11. The holding part which has the ball | bowl 11E and hold | maintains the nut N2 for locking | loosening is arrange | positioned by protruding from the internal peripheral surface at equal intervals in the circumferential direction of the holding | maintenance part 12D of the socket part 12 3 Since the ball 12G is provided, the fastening bolt N1 and the locking nut N2 can be respectively held by the clutch portion 11 and the socket portion 12 and securely tightened.

  The present invention is not limited to the above-described embodiment. For example, the clutch mechanism 14 may be provided on the clutch part 11 side, and the coil spring 14B that elastically biases the clutch ball 14C may be used. Instead, other elastic members such as rubber may be used. Further, the space formed by the holding portion 11A of the clutch portion 11 and the holding portion 12D of the socket portion 12 may be substantially the same as the height at which the fastening nut N1 and the locking nut N2 are overlapped. In short, as long as it does not contradict the gist of the present invention, all the components of the present invention are appropriately changed in design are included in the present invention. Moreover, the usage aspect of the double nut fastening tool 10 is not restrict | limited to the said embodiment at all.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used as a double nut tightening tool used when tightening a fastening nut having a coarse pitch and a fastening nut having a fine pitch together with a locking bolt having a double screw structure.

It is sectional drawing which shows the relationship between the double nut fastening tool of one Embodiment of this invention, and the bolt of a double screw structure. It is sectional drawing which shows the state which tightened the double nut to the bolt of the double screw structure using the double nut fastening tool shown in FIG. It is sectional drawing which shows the clutch part of the double nut fastening tool shown in FIG. 1, (a) is the top view seen from the upper part, (b) is sectional drawing. 1 is a cross-sectional view showing a socket portion of the double nut tightening tool shown in FIG. 1, wherein (a) is a plan view seen from above, (b) is a cross-sectional view, and (c) is a cross-sectional view passing through the center of the through hole. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Double nut fastening tool 11 Clutch part 11A Cylindrical large diameter part, holding part 12 Socket part 12D Holding part 13 Housing 13A Stop ring 13B Collar 14 Clutch mechanism 14B Coil spring (elastic member)
14C Ball for clutch (ball)
14D Clutch groove (groove)
B Loosening prevention bolt (bolt with double screw structure)
N1 fastening bolt (first nut)
N2 Locking nut (second nut)

Claims (4)

  A double nut tightening tool for tightening a first nut with a coarse pitch and a second nut with a fine pitch to a bolt with a double screw structure, and a substantially cylindrical clutch portion for holding the first nut, A substantially cylindrical socket portion that is arranged on the clutch portion with a common axis and holds the second nut, and a housing in which the clutch portion and the socket portion are housed so as to be relatively rotatable. Features a double nut tightening tool.   A clutch mechanism is provided between the clutch part and the socket part for connecting and releasing the clutch part, and the clutch machine mechanism releases the connection with the clutch part, and the socket part is connected to the clutch part. The double nut tightening tool according to claim 1, wherein the double nut tightening tool is configured to be independently rotatable.   The clutch mechanism includes a plurality of recesses formed at predetermined intervals in the circumferential direction in one of the clutch part and the socket part, balls elastically stored in these recesses, 3. The invention according to claim 1, further comprising a plurality of groove portions formed at predetermined intervals in the circumferential direction on either one of the clutch portion and the socket portion and into which the balls are respectively elastically fitted. Double nut tightening tool as described.   The holding portion that holds the first nut has a plurality of balls that are arranged to protrude from the inner peripheral surface at equal intervals in the circumferential direction of the inner peripheral surface of the clutch portion, and the second nut The holding portion for holding the nut has a plurality of balls disposed so as to protrude from the inner peripheral surface at equal intervals in the circumferential direction of the inner peripheral surface of the socket portion. Item 4. The double nut tightening tool according to any one of items 3 to 3.

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