JP2016169807A - Fastening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening tool which allows a user to easily grasp an axial force.SOLUTION: A fastening tool 10 includes: a substantially cylindrical shaped box 14; a spring mechanism 20 formed by overlapping seven (several) disc springs 18, each of which has a center hole 16, the spring mechanism 20 housed in the box 14; and a slide member 28 which has a center through hole 22 and sandwiches the spring mechanism 20 with a bottom plate 12 of the box 14. A visual observation window 30 which allows a user to view and grasp a contraction distance of the spring mechanism 20 is provided in the box 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fastening device for fixing one member to another member.

  Conventionally, fastening devices such as bolts and wood screws have been used to fix one member to another member.

  As an example of the fastening device, a bolt 104 having a leg 100 and a head 102 is shown in FIG.

  In order to fix the one member 106 to the other member 108 with the bolt 104, first, the hole 110 is provided in the one member 106 and the hole 112 is provided in the other member 108. Next, the hole 110 is aligned with the hole 112, and one member 106 is overlaid on the other member 108. The leg portion 100 of the bolt 104 is passed through the holes 110 and 112, the nut 114 is disposed on the back side of the other member 108, the head portion 102 of the bolt 104 is rotated by a tool, and the tip portion of the leg portion 100 is moved to the other member. It is screwed into a nut 114 arranged on the back side of 108. A washer 116 is interposed between the head 102 of the bolt 104 and the one member 106 and between the nut 114 and the other member 108 to prevent loosening.

  The operator recognizes the resistance force from the bolt 104 against the rotation of the bolt 104 by tactile sense, and determines that the recognized resistance force is sufficient to properly fix the one member 106 to the other member 108. When this occurs, the rotation of the bolt 104 by the tool is stopped. In this way, the one member 106 is fixed to the other member 108 by the bolt 104 and the nut 114. When one member 106 is fixed to the other member 108 by the bolt 104 and the nut 114, the axial force (reverse force) is applied from the head 102 of the bolt 104 to the one member 106 and from the nut 114 to the other member 108. Force, fastening force) P is added.

  However, if it is determined by the operator's sense of touch whether the resistance force from the bolt 104 is sufficient to properly fix one member 106 to the other member 108, the axial force P is too small. Therefore, the bolt 104 and the nut 114 may be loosened, or the axial force P may be too large, and the one member 106 may be damaged. In addition, after fixing one member 106 to another member 108 with a bolt 104 and a nut 114, grasp the axial force P when the axial force P decreases due to the deterioration of the one member 106 and the like over time. I could not.

  Here, an axial force meter capable of quantitatively measuring the axial force is commercially available. Moreover, the invention of the axial force meter is also performed (for example, refer patent document 1).

  However, when an axial force meter is used, it is necessary to attach the axial force meter to a bolt or the like every time the axial force is measured, and it is difficult to grasp the axial force. In addition, when an axial force meter is used, the axial force meter is expensive, so the cost increases for grasping the axial force.

Japanese Patent Laid-Open No. 10-30283

  An object of this invention is to provide the fastening device which can grasp | ascertain easily the axial force which arises in a volt | bolt.

The fastening device according to the present invention comprises a substantially cylindrical box having a bottom plate and a central axis, and a plurality of disc springs having a central hole, or a coil spring, or a coil spring. A spring mechanism housed above, a central through-hole, sandwiching the spring mechanism together with the bottom plate of the box, and having a pressed portion that is pressed in the direction of the central axis of the box by a screw component; A slide member that is slidable against the biasing force of the spring mechanism in the central axis direction of the box when the pressing portion is pressed,
The box has a viewing window through which the contraction distance of the spring mechanism can be grasped.
The fastening device according to the present invention is characterized in that the box includes a scale capable of quantitatively grasping the contraction distance of the spring mechanism.

  According to the fastening device of the present invention, for example, the leg of the bolt is passed through the center through hole of the slide member and the center hole of the disc spring, and the leg is passed through the hole provided in one member and the other member. By screwing into the nut, the one member and the other member can be pressed and clamped by the bottom plate and the nut of the box, and the one member can be fixed to the other member.

  At this time, the axial force applied from the bottom plate of the box to one member and from the nut to the other member increases as the disc spring contracts. Therefore, the axial force applied from one member to the bolt and from the other member to the nut can be estimated by grasping the contraction distance of the spring mechanism by viewing the spring mechanism from the viewing window. For this reason, the axial force generated in the bolt can be easily grasped by visual observation, and one member can be fixed to another member by an appropriate axial force. Thereby, the axial force is not so small that the fixing is loosened, or the axial force is not too great to damage one member or the like.

  In addition, when a certain period of time has passed after fixing one member to another member, and when it is desired to confirm the reduced axial force due to the deterioration of one member or the like, the spring mechanism is visually observed from the viewing window. The axial force can be confirmed by grasping the contraction distance.

It is a figure which shows the fastening instrument which concerns on this invention, the figure (a) is a top view, The figure (b) is front sectional drawing. It is a front view which shows the fastening instrument of FIG. It is a figure which shows the use condition of the fastening instrument of FIG. 1, the figure (a) is a top view, The figure (b) is front sectional drawing. It is a front view which shows the use condition of the fastening instrument shown in FIG. It is front sectional drawing which shows the use condition of the fastening instrument shown in FIG. It is front sectional drawing which shows the other usage method of the fastening device which concerns on this invention. It is front sectional drawing which shows the further another usage method of the fastening device which concerns on this invention. It is front sectional drawing which shows the conventional volt | bolt and nut mechanism.

  Next, embodiments of the present invention will be described in detail based on the drawings. 1 and 2, reference numeral 10 indicates a fastening device of the present invention.

  As shown in FIG. 1, the fastening device 10 includes a substantially cylindrical (substantially cylindrical) box 14 having a bottom plate 12 and a central axis C, and seven (a plurality of) disc springs 18 having a central hole 16. And a spring mechanism 20 which is configured to be overlapped and accommodated on the bottom plate 12 of the box 14. Moreover, it has the central through-hole 22 which penetrates the leg part of a volt | bolt, clamps the spring mechanism 20 with the baseplate 12 of the box 14, and is pressed to the center axis C direction of the box 14 by the head etc. of a volt | bolt (screw component). And a slide member 28 that is slidable in the direction of the central axis C of the box 14 when the pressed portion 26 is pressed.

  As shown in FIG. 2, the box 14 has a viewing window 30 through which the spring mechanism 20 can be seen to grasp the contraction distance of the spring mechanism 20. A scale 32 is provided along the viewing window 30 so that the contraction distance of the spring mechanism 20 can be grasped quantitatively.

  As shown in FIGS. 1 and 2, the spring mechanism 20 is configured by alternately stacking a disc spring 18 with a convex portion on the front surface side and a disc spring 18 with a concave portion on the back surface side down. Yes. In FIG. 2, the outer peripheral surface is hatched and the tapered portion is not hatched so that the overlapping state of the seven disc springs 18 becomes clear. As shown in FIG. 2, a thick line 34 in the outer circumferential direction is drawn at the upper end of the uppermost disc spring 18 so that the amount of movement of the uppermost disc spring 18 in the direction of the central axis C can be easily visually checked. It is configured so that the amount of contraction of the spring mechanism 20 can be easily recognized.

  As shown in FIG. 1, the slide member 28 includes a sliding surface 38 that can slide in the direction of the central axis C of the box 14 along the inner peripheral wall 35 of the box 14. The slide member 28 slides in the direction of the central axis C so as to contract the spring mechanism 20 when the pressed portion 26 is pressed by the head 24 of the bolt or the like. Note that sliding of the slide member 28 in the direction in which the spring mechanism 20 extends is regulated by a stopper 36 provided in the box 14.

  The effects of the fastening device 10 according to the present invention having the above-described configuration will be described below.

  First, as shown in FIG. 3, the leg portion 44 of the bolt 42 having the hexagonal hole 40 is inserted into the central through hole 22 of the slide member 28 and the central hole 16 of the seven disc springs 18, and the head portion 46 of the bolt 42. Is brought into contact with the pressed portion 26 of the slide member 28.

  At this time, the spring mechanism 20 has an uncompressed natural length, and as shown in FIG. 4, the thick line 34 drawn on the uppermost disc spring 18 is located at the uppermost end.

  Next, as shown in FIG. 5, the leg portion 44 of the bolt 42 is passed through the hole 50 provided in one member 48 and the hole 54 provided in the other member 52, and using a hexagon wrench 56, The leg portion 44 of the bolt 42 is screwed into the nut 58. As the hexagon wrench 56 is rotated, the leg portion 44 is further screwed into the nut 58, and the box 14 and the nut 58 of the fastening device 10 eventually sandwich the one member 48 and the other member 52. A washer 60 is interposed between the fastening device 10 and the one member 48 and between the nut 58 and the other member 52 to prevent loosening.

  Here, as the hexagon wrench 56 is further rotated from the state where the fastening device 10 and the nut 58 sandwich the one member 48 and the other member 52, the leg portion 44 of the bolt 42 is further screwed into the nut 58. It will be done. When the leg portion 44 of the bolt 42 is further screwed into the nut 58, the slide member 28 is pressed against the pressed portion 26 by the head portion 46 of the bolt 42 and slides toward the nut 58 in the direction of the central axis C. . As the slide member 28 slides, the spring mechanism 20 contracts.

  When the spring mechanism 20 contracts, the repulsive force of the spring mechanism 20 causes the spring mechanism 20 to press the bottom plate 12 of the box 14, the bottom plate 12 presses one member 48, and the axial force P is applied from the bottom plate 12 to the one member 48. Added. An axial force O is applied from the nut 58 to the other member 52 as a resistance against the axial force P being applied to the one member 48 from the bottom plate 12.

  At this time, the operator visually recognizes the spring mechanism 20 from the viewing window 30 and recognizes the contraction distance of the spring mechanism 20. Since the scale 32 is provided along the viewing window 30, if the operator records the axial force per scale of the scale 32 in advance, the operator can read the scale of the contraction distance to read the scale. The force P can be grasped quantitatively. For example, when it is recorded that the axial force per division is 2 kN (kilonewtons), it can be recognized that the axial force P is 6 (2 * 3) kN if the contraction distance is 3 divisions. Note that the axial force per scale may be displayed around the scale 32.

  According to the present invention, since the operator can grasp the axial force P applied from the bottom plate 12 to the one member 48 and from the nut 58 to the other member 52 in this way, an appropriate axial force is applied in advance. If recorded, the one member 48 can be fixed to the other member 52 with an appropriate axial force by adjusting the number of rotations of the hexagon wrench 56 so as to obtain an appropriate axial force. Thus, the axial force is not so small that the fixing is loosened, or the axial force is not so great that the one member 48 or the like is damaged.

  Here, the usage method of the fastening device 10 of this invention is not limited to the usage method shown to FIGS. That is, as shown in FIG. 6, the bolts 42 and the nuts 58 may be arranged opposite to those shown in FIGS.

  In FIG. 6, the leg portion 44 of the bolt 42 is inserted into the hole 54 of the other member 52 and the hole 50 of the one member 48, and then the central hole 16 of the disc spring 18 and the central through hole 22 of the slide member 28. And the vicinity of the tip of the leg portion 44 is screwed into the nut 58. At this time, the pressed portion 26 of the slide member 28 is pressed by the nut 58.

  According to the method of using the fastening device 10 of the present invention shown in FIG. 6, the operator visually recognizes the spring mechanism 20 from the viewing window 30 and recognizes the contraction distance of the spring mechanism 20, whereby the bottom plate 12 of the box 14. Thus, the axial force P applied to the one member 48 and the other member 52 from the head 46 of the bolt 42 can be grasped.

  Moreover, the usage method shown in FIG. 7 may be sufficient as the usage method of the fastener 10 of this invention. In FIG. 7, the head 62 does not have a hexagonal hole, and a bolt 64 whose outer periphery is rotated by a spanner (not shown) is used. In order to rotate the bolt 64 with a spanner, the fastening device 10 is used with the head 62 of the bolt 64 placed outside the box 14. In this case, the pressed portion 26 where the slide member 28 is pressed by the head portion 62 of the bolt 64 is constituted by the upper end of the slide member 28. In this case, since the bolt 64 is rotated by a wrench, the height of the upper end of the slide member 28 is kept in the box 14 even if the bolt 64 is rotated in the direction approaching the nut 58 until the axial force becomes appropriate. It is preferable that the length does not enter.

  As mentioned above, although embodiment of this invention was described based on drawing, this invention is not limited to illustrated embodiment. For example, the shape of the box is not limited to a substantially cylindrical shape, and may be a substantially cylindrical shape having a polygonal cross section. Further, the number of disc springs stored in the box is not limited to seven, and may be six or less or eight or more. Further, the spring mechanism may be one coil spring or a plurality of coil springs stacked in the central axis direction. Moreover, the direction of each disc spring to be overlaid can be appropriately selected.

DESCRIPTION OF SYMBOLS 10 Fastener 12 Bottom plate 14 Box 16 Central hole 18 Belleville spring 20 Spring mechanism 22 Central through-hole 24 Head 26 Pressed part 28 Slide member 30 Visual window 32 Scale 34 Thick line 36 Inner peripheral wall 36 Stopper 38 Sliding surface 40 Hexagonal hole 42 Bolt 44 Leg 46 Head 48 One member 50 Hole 52 Other member 54 Hole 56 Hexagon wrench 58 Nut 60 Washer C Center axis P Axial force

Claims (2)

A substantially cylindrical box having a bottom plate and a central axis;
A plurality of disc springs having a central hole, or a coil spring, and a spring mechanism housed on the bottom plate of the box;
A central through hole, sandwiching the spring mechanism together with the bottom plate of the box, and having a pressed portion that is pressed in the direction of the central axis of the box by a screw component, and when the pressed portion is pressed, A slide member slidable against the urging force of the spring mechanism in the central axis direction of the box,
The box is a fastening device having a viewing window capable of grasping a contraction distance of the spring mechanism.   The fastening device according to claim 1, wherein the box includes a scale capable of quantitatively grasping a contraction distance of the spring mechanism.

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