JP7573872B2 - Clamping device having a nut holder - Google Patents

Description

The present invention relates to a clamping device having a nut holder that holds a hexagonal nut in a nut insertion groove.

Bolts and nuts are used to connect and fasten two members. The hexagonal nut is inserted into a nut insertion groove formed in the fastening member so that it does not rotate when the bolt is screwed in. In this case, when inserting the hexagonal nut into the groove opening of the nut insertion groove of the grooved member, it is necessary to be able to insert the hexagonal nut into the groove in a specified position from the groove end opening while being held by a holder.

In order to solve this problem, in Patent Document 1, the nut is held in the holding part of the holder, and is inserted sideways into the groove opening of the groove, and is further pushed into the groove, so that the nut is held in a predetermined position. The holder has an elastic support part that extends from a base located on the side of the holder and has a deformable part that extends in an inclined direction, and a support part is provided at the tip of the deformable part (solution).

JP 2017-115956 A

In the above-mentioned conventional technology, the elastic support part elastically abuts against the groove wall, thereby holding the hexagonal nut in a fixed position relative to the nut insertion groove. However, the holding position in the longitudinal direction of the nut insertion groove (the required distance from the groove end opening of the nut insertion groove) is not specified, and this technology is difficult to apply when a bolt hole is formed in the member forming the nut insertion groove and it is necessary to place the hexagonal nut concentrically in the bolt hole.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a clamp device having a nut holder that can solve the problems of the prior art.
The present invention aims to provide a clamping device having a nut holder that can hold a hexagonal nut in a nut insertion groove formed in a clamping member by specifying its position in the longitudinal direction of the groove using the nut holder.

A specific means for solving the problem in a clamp device having a nut holder of the present invention is a clamp device comprising two clamp members A, B respectively assigned to the front and back of two members 12, 12 to be connected, a bolt 10 inserted into a bolt hole Aa formed in one of the clamp members A, and a hexagonal nut N inserted into a nut insertion groove 8 formed in the other clamp member B into which the bolt 10 is screwed. The other clamp member B has a bolt hole Ba formed therein at a position spaced from the end of the nut insertion groove 8 and perpendicular to the nut insertion groove 8, and a nut holder 1 for holding the hexagonal nut N is disposed between the nut insertion groove 8 and the hexagonal nut N. The nut holder 1 is characterized in that it has an engagement portion 4 that engages with a pair of corners on a diagonal line P of the hexagonal nut N, a connecting portion 5 that connects the pair of engagement portions 4, and a positioning arm portion 6 that protrudes outward from at least one of the engagement portions 4 and has an engagement protrusion 6a at its tip that engages with the end of the nut insertion groove 8.

According to the present invention , the clamp member B having the nut insertion groove 8 of the clamp device has a bolt hole Ba, and when the nut holder is inserted into the nut insertion groove 8 and the engaging protrusion 6a of the positioning arm 6 is engaged with the groove end opening of the nut insertion groove 8, it becomes possible to determine the longitudinal position of the hexagonal nut N within the nut insertion groove 8 to a position that approximately coincides with the bolt hole Ba.

FIG. 2 is a front perspective view showing an embodiment of a nut holder of the present invention. FIG. FIG. 4 is a perspective view of the rear side of the nut holder. FIG. FIG. FIG. 1A is a perspective view of the nut holder assembled in the clamp member, FIG. 1B is a perspective view of the horizontal section of the nut holder assembled in the clamp member, and FIG. 1C is a perspective view of the vertical section of the nut holder assembled in the clamp member. FIG. 2 is a cross-sectional plan view of the clamping device. FIG. 1 is a perspective view of a workbench utilizing a clamping device. FIG. 13 is a perspective view showing a first modified example of the nut holder. FIG. 11 is a perspective view showing a second modified example of the nut holder.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 6 show an embodiment of the nut holder 1 alone, and FIGS. 7 to 9 show an embodiment in which the nut holder 1 is incorporated into a clamping device 2. In FIG.
The clamp device 2 comprises two clamp members A, B which are respectively assigned to the front and back of two connecting members (pillars) 12, 12, a bolt 10 which is inserted into a bolt hole Aa formed in one of the clamp members (front clamp member) A, and a hexagonal nut N which is inserted into a nut insertion groove 8 formed in the other clamp member (back clamp member) B and into which the bolt 10 is screwed, and the nut holder 1 holds the hexagonal nut N within the nut insertion groove 8 and determines the longitudinal position of the groove of the hexagonal nut N.

The other clamp member B is formed with a bolt hole Ba through which the bolt 10 is inserted, and a nut insertion groove 8 is formed long in the vertical direction on the back side. This nut insertion groove 8 penetrates the clamp member B from the top to the bottom, and is provided with a retaining edge 8a to prevent the hexagonal nut N stored therein from slipping out to the open side of the groove (toward the center of the bolt hole Ba).
1 to 6, the nut holder 1 is integrally molded from an elastic synthetic resin and has an engaging portion 4 that engages with a pair of corners on a diagonal line P of a hexagonal nut N, a connecting portion 5 that faces the hexagonal nut N and connects the pair of engaging portions 4 and has a bolt through hole 5a that is concentric with the female threaded hole Na of the hexagonal nut N, and a positioning arm portion 6 that protrudes outwardly above and below from both side ends of the pair of engaging portions 4 and has an engaging protrusion 6a on its tip side a required distance away from the bolt through hole 5a.

The nut insertion groove 8 formed in the other clamp member B has a groove width slightly wider than the width of the two parallel faces of the hexagonal nut N, and when the hexagonal nut N attempts to rotate, the two parallel faces collide with the groove walls, preventing the rotation of the hexagonal nut N. The two parallel faces of the hexagonal nut N refer to a pair of parallel side faces that are away from the pair of corners into which the fitting portion 4 fits.
The upper and lower fitting portions 4 are V-shaped and inverted V-shaped, respectively, and their width dimensions are shorter than the groove width of the nut insertion groove 8 and the two-face width of the hexagonal nut N, so that they can be inserted into the nut insertion groove 8 while being fitted into the hexagonal nut N.

The connecting portion 5 is a slightly larger hexagon facing the front of the hexagonal nut N, with a bolt through hole 5a formed in the center and a connecting portion 5b formed on the top and bottom for connecting the upper and lower fitting portions 4. The connecting portion 5b fits between the opposing retaining edges 8a on the opening side of the nut insertion groove 8.
The pair of connecting portions 5b connect the upper and lower fitting portions 4 located within the nut insertion groove 8 to the connecting portion 5 located outside the nut insertion groove 8, so that the hexagonal nut N can be held between the upper and lower fitting portions 4 and the two opposing sides of the hexagonal nut N can be engaged with the anti-slip edge portions 8a.

The positioning arm 6 rises from the side end of the fitting portion 4 and becomes an arm parallel to the two parallel faces of the hexagonal nut N. At the tip of the arm, a hook-shaped engagement protrusion 6a protrudes in a direction perpendicular to the two parallel faces of the hexagonal nut N. This engagement protrusion 6a protrudes outward from the two parallel faces of the hexagonal nut N, and when the nut holder 1 is inserted into the nut insertion groove 8, it can engage with the groove end of the nut insertion groove 8 (the upper and lower surfaces of the clamp member B).

The upper and lower pairs of positioning arms 6 rising from both side ends of the upper and lower fitting parts 4 engage with the left and right groove ends at the upper and lower ends of the nut insertion groove 8, and determine the position in the groove longitudinal direction (the vertical direction in Figs. 2 and 4) of the hexagonal nut N held by the nut holder 1. The position of the hexagonal nut N to be determined is a position that is approximately concentric with the bolt hole Ba formed in the clamp member B.
That is, a bolt hole Ba into which a bolt 10 is inserted is formed in the clamp member B at a required distance L2 from the top surface of the clamp member B, and a nut insertion groove 8 is formed vertically through the back side of this bolt hole Ba. Therefore, when the nut holder 1 is inserted into the nut insertion groove 8 from the top surface of the clamp member B, the engaging protrusion 6a of the positioning arm 6 engages with the groove end opening of the nut insertion groove 8, and the female threaded hole Na of the hexagonal nut N becomes approximately concentric with the bolt hole Ba. Furthermore, to achieve this, the distance L1 from the bolt through hole 5a, which is concentric with the female threaded hole Na, to the engaging protrusion 6a is set to be approximately equal to the distance L2 from the bolt hole Ba of the other clamp member B to the groove end opening of the nut insertion groove 8.

In Figures 7-9, the clamping device 2 is used to connect two stepped work tables D2 to form a combined work table structure, and can also be used to connect two box-type work tables D1 to the rear of the two stepped work tables D2.
In Figure 9, one stepped workbench D2 has two pillars (members) 12, 12 and upper and lower pillar connecting members 13a connected with connecting plates 22a to form a square frame 22, the lower pillar connecting member 13a protruding forward to connect the lower part of a short pillar 12 which is approximately half the length of the pillar 12, and the upper part of this short pillar 12 and the upper and lower middle parts of the long pillar 12 are connected with the short pillar connecting member 13a via the connecting plate 22a to form a staircase frame 24 in which two square frames, one large and one small, are combined, and a pair of these staircase frames 24 are connected with frame connecting members 13b, and an upper stage base plate 14 is erected between the upper stages of the pair of staircase frames 24, and a lower stage base plate 16 is erected between the lower stages of the pair of staircase frames 24.

That is, a long pillar 12 is placed at each of the four corners, two short pillars 12 shorter than the long pillars 12 are placed outside the two long pillars 12 on one side, the six pillars 12 are connected with pillar connecting members 13a, an upper stage base plate 14 is provided on the top of the four long pillars 12, and a lower stage base plate 16 is provided between the top of the two short pillars 12 and the upper and lower middle parts of the two long pillars 12 to form a stepped workbench D2.

When two stepped workbenches D2 are placed next to each other, three of the six support columns 12, 12 of each are parallel and facing each other, and the two parallel support columns are connected by a clamp device 2 to form a combined workbench structure. The long and short support columns 12, 12 are made of channel members L with a U-shaped (gate-shaped) cross section, and are two members 12, 12 connected by a clamp device 2.

The box-shaped workbench D1 has approximately the same structure as the large rectangular frame portion of the staircase-shaped workbench D2, and the rear support column 12 of the staircase-shaped workbench D2 is adjacent to and parallel to the front support column 12 of the box-shaped workbench D1 and is connected by a clamp device 2. The side of the clamp device 2 that can be seen from the outside of the box-shaped workbench D1 is the front side, and the inner side is the back side.
As shown in FIG. 8, the channel material L used in the pillars 12, 12 is an aluminum extrusion material or a steel section material having a U-shaped cross section, and has a main portion La which forms the front surface side, and a pair of side portions Lb which protrude from both ends of the main portion La to the rear surface side.

The main portion La and the side portion Lb are formed with a large number of protruding ribs c along the longitudinal direction of the channel member L and grooves d between the ribs c in the width direction, giving the channel member L a shape with high bending strength.
When channel-shaped materials L are used as the supports 12, 12 of the box-shaped workbench D1 and the staircase-shaped workbench D2, the main part La is on the side that appears to have a frame shape such as a square frame 22 or a staircase frame 24, and the side part Lb is on the side that appears to have a pair of frames.

Therefore, the clamp device 2 that connects two parallel channel members L must take one of two forms: one in which the main parts La face each other and the side parts Lb are connected side by side, as in connecting box-shaped work tables D1 to each other or stair-shaped work tables D2 to each other (shown by phantom lines in Figure 8), and one in which the side parts Lb face each other and the main parts La are connected side by side, as in connecting a box-shaped work table D1 and a stair-shaped work table D2 (shown by solid lines in Figure 8).

The side of the clamping device 2 that can be seen from the outside of the box-shaped workbench D1 is the front side, and the inside side is the back side. The clamping device 2 is equipped with a back clamping member B whose opposing surface portion Bb is applied to one side (back side) of the two channel members L, a front clamping member A whose opposing surface portion Ab is applied to the other side (front side) opposite to the one side of the two channel members L, and a fastener C that fastens the back clamping member B and the front clamping member A.

The fastener C has a bolt 10 such as a hexagonal head bolt or a wing bolt, and a hexagonal nut N into which the bolt 10 is screwed.
The back clamp member B is a horizontally elongated material formed from an extruded metal material, one side of which forms the opposing surface portion Bb, and a protruding first spacing setting portion Bd is provided at the widthwise center of the connecting member opposing surface portion Bb, a bolt hole Ba is formed in the center of the first spacing setting portion Bd, and a nut insertion groove 8 that is long in a direction perpendicular to the bolt hole Ba is formed on the back side.

The connecting member facing surface Bb of the back clamp member B is provided with an engagement portion 27 that prevents the side portion Lb of the channel member L from shifting between the first spacing setting portion Bd when the side portion Lb of the channel member L comes into contact with the engaging portion 27. The engaging portion 27 is in the shape of a protrusion, and the dimension between the engaging portion 27 and the side surface of the first spacing setting portion Bd is approximately the same as the width dimension of the side portion Lb of the channel member L (it may be slightly longer than the same).

The connecting member facing surface Bb of the back clamp member B is provided with a locking portion 8 that prevents the ends of both side portions Lb of the channel member L from shifting between the first spacing setting portion Bd and the main portion La of the channel member L when the main portion La faces the channel member L and one side portion Lb abuts against the first spacing setting portion Bd. The locking portion 8 is in the shape of a narrow groove, and the distance between the two locking portions 8 is the distance between the both side portions Lb of the channel member L, and the side portion Lb is inserted into and engaged with the narrow groove of the locking portion 8.

When the back surface of the main portion La of the channel member L faces the first spacing setting portion Bd, the ends of both side portions Lb come into contact with the first spacing setting portion Bd, and the main portion La does not interfere with the engagement portion 27. Therefore, the engagement portion 8 is made in a narrow groove shape, but it may have a protrusion shape similar to the engagement portion 7, as long as the side surface of the first spacing setting portion Bd and the protrusion-shaped engagement portion 8 can determine the position of both side portions Lb of the channel member L so that they do not shift.

The rear clamp member B has an engagement portion 27 and a locking portion 8 on the connecting member facing surface Bb, so it can take a side contact form in which it contacts one side Lb of the channel member L, or a form in which it contacts the ends of both side portions Lb opposite the main portion La. However, it is also possible to provide only the engagement portion 27 on the connecting member facing surface Bb to make a dedicated clamp for the side contact form, or to omit the engagement portion 27 and provide only the locking portion 8 on the connecting member facing surface Bb to make a dedicated clamp for the both side contact form.

The front clamp member A is a horizontally elongated member formed from a metal extrusion, one side of which forms the connecting member facing surface portion Ab, and a protruding second spacing setting portion Ad is provided in the widthwise center of the connecting member facing surface portion Ab, with a bolt hole Aa formed in the center of the second spacing setting portion Ad. The second spacing setting portion Ad has inclined surfaces Ae on the left and right sides to make it easier to insert between the two channel members L.

The dimension of the front clamp member A from the second interval setting portion Ad of the connecting member facing surface portion Ab to the side end is shorter than the width dimension of the side portion Lb of the channel member L, and the side end is provided with a pointed edge 30 which protrudes and catches in the groove d between the ribs c on the surface of the channel member L. The tip of the pointed edge 30 has a semicircular arc surface.
Therefore, when one side portion Lb of the channel shape L comes into contact with the connecting member facing surface portion Bb of the back clamp member B, the connecting member facing surface portion Ab and pointed edge 30 of the front clamp member A abut against the other side portion Lb of the channel shape L and get caught in the groove d, clamping the main portion La of the channel shape L in its width direction, and when the main portion La of the channel shape L faces the connecting member facing surface portion Bb of the back clamp member B, the connecting member facing surface portion Ab and pointed edge 30 abut against and get caught on the surface side of the main portion La of the channel shape L, clamping one side portion Lb of the channel shape L in its width direction.

The clamp device 2 has a back clamp member B positioned on the inside side of the work table of two channel shapes L arranged in parallel, and a front clamp member A positioned on the surface side of the work table of the two channel shapes L. The bolt 10 of the fastener C is passed through from the surface side of the work table and screwed into a hexagonal nut N located on the back side of the back clamp member B, thereby clamping the two channel shapes L on both sides of the bolt 10.
The nut insertion groove 8 of the back clamp member B is long in the vertical direction of the horizontal material and penetrates from the top to the bottom, i.e., the groove ends are open on the top and bottom, a bolt hole Ba is formed in the center between the top and bottom, the groove width is approximately equal to the width of the two opposing faces of the hexagonal nut N, the hexagonal nut N can be inserted into the nut insertion groove 8, but the two opposing faces abut against the groove walls so that it cannot rotate. The nut insertion groove 8 has a pair of retaining edges 8a facing the opening side of the back surface, which prevents the hexagonal nut N from falling off to the back surface side.

The hexagonal nut N is held by the nut holder 1 shown in Figures 1 to 6 and inserted into the nut insertion groove 8. When the nut holder 1 holding the hexagonal nut N is inserted into the nut insertion groove 8, the engagement protrusion 6a of the positioning arm 6 engages with the end of the upper surface of the nut insertion groove 8, and the longitudinal positions of the female threaded hole Na of the hexagonal nut N and the bolt through hole 5a of the nut holder 1 in the nut insertion groove 8 approximately match. When the bolt 10 is inserted from the bolt hole Aa of the front clamp member A in this state, it is inserted into the bolt hole Ba of the back clamp member B and the bolt through hole 5a of the nut holder 1, and smoothly screws into the female threaded hole Na of the hexagonal nut N.

FIG. 10 shows a first modified example of the nut retainer 1 .
The nut holder 1-2 has an engagement portion 4 that engages with the upper and lower corners of the hexagonal nut N, a connecting portion 5 that connects the pair of engagement portions 4 and has a bolt through hole 5a formed therein, and a positioning arm portion 6 that protrudes upward and outward from both side ends of the upper engagement portion 4 and has an engagement protrusion 6a at its tip side a required distance away from the bolt through hole 5a.

The nut holder 1-2 is inserted from the upper end of the nut insertion groove 8, and the upper pair of engaging protrusions 6a engage with the upper end of the groove, thereby determining the position where the female threaded hole Na of the hexagonal nut N is concentric with the bolt hole Ba of the back clamp member B.
In FIG. 11, a second modified example of the nut retainer 1 is shown.
The nut holder 1-3 has an engagement portion 4 that engages with the upper and lower corners of the hexagonal nut N, a connecting portion 5 that connects the pair of engagement portions 4 and has a bolt through hole 5a formed therein, and a positioning arm portion 6 that protrudes outwardly above and below from the same side end of the upper and lower engagement portions 4 and has an engagement protrusion 6a at its tip side a required distance away from the bolt through hole 5a.

The nut holder 1-3 is inserted from the upper end of the nut insertion groove 8, and a pair of upper and lower engaging protrusions 6a engage with the upper and lower ends of the groove, thereby determining a position where the female threaded hole Na of the hexagonal nut N is concentric with the bolt hole Ba of the back clamp member B.
The nut holder 1 of the above-described embodiment has an engagement portion 4 that engages with a pair of corners on the diagonal line P of the hexagonal nut N, a connecting portion 5 that connects the pair of engagement portions 4, and a positioning arm portion 6 that protrudes outward from at least one of the engagement portions 4 and has an engagement protrusion 6a at its tip.

With this configuration, when the hexagonal nut N is held in the nut holder 1 and inserted into the nut insertion groove 8, the engagement protrusion 6a of the positioning arm 6 engages with the end of the nut insertion groove 8, making it possible to identify the longitudinal position of the hexagonal nut N within the nut insertion groove 8.
In addition, the nut holder 1 of the above embodiment has an engagement portion 4 that engages with a pair of corners on the diagonal line P of the hexagonal nut N, a connecting portion 5 that faces the hexagonal nut N and connects the pair of engagement portions 4 and forms a bolt through hole 5a concentric with the female threaded hole Na of the hexagonal nut N, and a positioning arm portion 6 that protrudes outward from at least one engagement portion 4 and has an engagement protrusion 6a on its tip side a required distance away from the bolt through hole 5a.

With this configuration, when the hexagonal nut N is held in the nut holder 1 and inserted into the nut insertion groove 8, the engagement protrusion 6a of the positioning arm 6 engages with the end of the nut insertion groove 8, making it possible to identify the longitudinal positions of the female threaded hole Na of the hexagonal nut N and the bolt through hole 5a of the nut holder 1 within the nut insertion groove 8.
The clamp device 2 of the above-mentioned embodiment is a clamp device comprising two clamp members A, B respectively assigned to the front and back of two connected members 12, 12, a bolt 10 inserted into a bolt hole Aa formed in one of the clamp members A, and a hexagonal nut N inserted into a nut insertion groove 8 formed in the other clamp member B into which the bolt 10 is screwed. The other clamp member B has a bolt hole Ba formed therein at a position spaced from the end of the nut insertion groove 8 and perpendicular to the nut insertion groove 8, and a nut holder 1 for holding the hexagonal nut N is disposed between the nut insertion groove 8 and the hexagonal nut N. The nut holder 1 is provided with an engagement portion 4 which engages with a pair of corners on a diagonal line P of the hexagonal nut N, a connecting portion 5 which connects the pair of engagement portions 4, and a positioning arm portion 6 which protrudes outward from at least one of the engagement portions 4 and has an engagement protrusion 6a at its tip which engages with the end of the nut insertion groove 8.

With this configuration, when the hexagonal nut N is held by the nut holder 1 and inserted into the nut insertion groove 8 formed in the other clamp member B, the engagement protrusion 6a of the positioning arm 6 engages with the end of the nut insertion groove 8, and the longitudinal position of the female threaded hole Na of the hexagonal nut N and the bolt through hole 5a of the nut holder 1 within the nut insertion groove 8 can be identified. When the bolt 10 is inserted through the bolt hole Aa of one clamp member A, it is inserted into the bolt hole Ba of the other clamp member B and the bolt through hole 5a of the nut holder 1, and can be smoothly screwed into the female threaded hole Na of the hexagonal nut N.

In addition, in the clamp device 2 of the above embodiment, the nut holder 1 has a bolt through hole 5a formed in the connecting portion 5 that is arranged concentrically with the female threaded hole Na of the hexagonal nut N, the positioning arm portion 6 protrudes from both side ends of one fitting portion 4 and/or protrudes from the same side ends of two fitting portions 4, and the distance L1 from the bolt through hole 5a to the engagement protrusion 6a is approximately equal to the distance L2 from the bolt hole Ba of the other clamp member B to the end of the nut insertion groove 8.

This configuration allows the female threaded hole Na of the hexagonal nut N, the bolt through hole 5a of the nut holder 1, and the bolt hole Ba of the other clamp member B to be more accurately positioned approximately concentrically within the nut insertion groove 8, and allows the bolt 10 inserted through the bolt hole Aa of one clamp member A to be inserted into the bolt hole Ba of the other clamp member B and the bolt through hole 5a of the nut holder 1, and can be smoothly screwed into the female threaded hole Na of the hexagonal nut N.

The present invention is not limited to the above-described embodiment, and the shape, configuration, and combination of the members can be changed.
For example, the positioning arm 6 may be a single one protruding from either the upper or lower fitting portion 4, and the engaging projection 6a may be semicircular, triangular, rectangular or the like in addition to the hook shape.
The bolt through hole 5a of the connecting portion 5 may be a square hole other than a circular hole, and if the tip of the bolt 10 does not protrude significantly from the hexagonal nut N, the bolt through hole 5a does not need to be provided.

REFERENCE SIGNS LIST 1 Nut holder 2 Clamp device 4 Fitting portion 5 Connection portion 5a Bolt through hole 5b Connecting portion 6 Arm portion 6a Engagement protrusion 7 Engagement portion 8 Nut insertion groove 8a Anti-slip edge portion 10 Bolt 12 Support (member)
24 staircase frame 27 engagement portion 8 locking portion 30 pointed edge A clamp member (front clamp member)
Aa Bolt hole B Clamp member (back clamp member)
Ba Bolt hole Bb Opposing surface Bd Spacing setting part C Fastener D1 Box-shaped workbench D2 Step-shaped workbench L Channel member L1, L2 Distance La Main part Lb One side part N Hexagonal nut Na Female screw hole P Diagonal line

Claims (2)

A clamp device comprising two clamp members (A, B) respectively assigned to the front and back of two members (12, 12) to be connected, a bolt (10) inserted into a bolt hole (Aa) formed in one of the clamp members (A), and a hexagonal nut (N) inserted into a nut insertion groove (8) formed in the other clamp member (B) and into which the bolt (10) is screwed,
The other clamp member (B) has a bolt hole (Ba) formed at a position spaced from the end of the nut insertion groove (8) and perpendicular to the nut insertion groove (8), and a nut holder (1) for holding the hexagonal nut (N) is disposed between the nut insertion groove (8) and the hexagonal nut (N),
The nut holder (1) is a clamping device having a nut holder, characterized in that it is provided with fitting portions (4) that fit into a pair of diagonal corners (P) of a hexagonal nut (N), a connecting portion (5) that connects the pair of fitting portions (4), and a positioning arm portion (6) that protrudes outward from at least one of the fitting portions (4) and has an engaging projection (6a) at its tip that engages with an end of a nut insertion groove ( 8) . The nut holder (1) has a bolt through hole (5a) formed in the connecting portion (5) that is concentric with the female threaded hole (Na) of the hexagonal nut (N), the positioning arm portion (6) protrudes from both side ends of one fitting portion (4) and/or protrudes from the same side ends of two fitting portions (4), and the distance (L1) from the bolt through hole (5a) to the engagement protrusion (6a) is approximately equal to the distance (L2) from the bolt hole (Ba) of the other clamp member (B) to the end of the nut insertion groove (8).

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