Fixture

Abstract

To provide a fastening device that is easy to operate. [Solution] The fixing device 2 has a main body 3 attached to the member to be fixed 1, a locking member 18 connected to the main body 3 via a shaft member 17, and a locking elastic member 24 and an insertion assist elastic member 25 positioned between the locking member 18 and the main body 3. When the member to be fixed 1 is inserted into the gripping hole 10 from the rear in the insertion direction D1, the locking surface 19 is pushed from the tip of the member to be fixed 1, and the locking member 18 rotates in the non-locking rotation direction RD2, against the restoring force of the locking elastic member 24, according to the restoring force of the insertion assist elastic member 25. In other words, the user can insert the member to be fixed 2 into the gripping hole 10, and the locking member 18 will rotate, allowing the member to be fixed 1 to pass through the gripping hole 10.

Description

Technical Field

[0001] The present invention relates to a fixture that is attached to and fixed to a fixed member.

Background Art

[0002] Conventionally, for example, thin metal plates, thin papers, etc. are wound around drums or core materials (hereinafter referred to as "drums, etc."). These drums, etc. are passed through a cylindrical bar and can rotate freely. When pulling out thin papers or thin metal plates, etc., it is necessary to prevent the drums, etc. from coming off the bar. Therefore, as a member that is attached to the bar to prevent the drums, etc. from coming off the bar, there is, for example, a fixing jig described in Patent Document 1 below (hereinafter referred to as "Literature-known Invention 1").

[0003] Literature-known Invention 1 has a central hole through which a bar is passed formed in a cylindrical main body, and the tip of a locking lever projects inside the central hole to lock to the bar. The locking lever is connected to the cylindrical main body via a pin and rotates about the pin. When the locking lever is operated by the user's hand and the tip of the locking lever comes to a position where it does not project inside the central hole, the bar can be inserted into the central hole. When the user releases the hand, the locking lever rotates by the restoring force of the coil spring, and the tip of the locking lever is pressed against the bar.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the publicly known invention (1), the user has to operate the operating lever against the elastic force of the coil spring in order to move the tip of the operating lever to a position where it does not protrude inside the central hole before the rod is passed through it. This is time-consuming, and the larger the spring constant of the coil spring, the more difficult it becomes to operate.

[0006] This invention was proposed in view of the above circumstances, and aims to provide a fastening device that is easy to operate. [Means for solving the problem]

[0007] To achieve the above objective, the fixing device according to the present invention comprises: a main body having a gripping hole into which a rod-shaped member to be fixed is inserted; a locking surface having an exposed locking surface on the inner circumferential surface of the gripping hole, which rotates around a rotation axis perpendicular to the gripping hole, changing from a protruding state where the locking surface protrudes from the inner circumferential surface when the member to be fixed is not inserted into the gripping hole, to a pressing state where the locking surface is pressed against the member to be fixed when the member to be fixed is inserted into the gripping hole; and a rotation direction on the opposite side of the locking surface with respect to the rotation axis where the protruding state occurs. The device comprises a locking elastic member that is compressed while pressing the locking member toward the rotation axis, and an insertion assisting elastic member that is compressed on the locking surface side with respect to the rotation axis while pressing the locking member toward a rotation direction opposite to the rotation direction in which it protrudes, wherein when the member to be fixed is inserted into the gripping hole, the locking surface is pressed away from the member to be fixed, and the locking member rotates against the restoring force of the locking elastic member in accordance with the restoring force of the insertion assisting elastic member, and at the same time that the member to be fixed is inserted into the gripping hole, the locking member enters the pressing state.

[0008] The fixing device according to the present invention is characterized in that, in the protruding state, the degree to which the locking surface portion protrudes from the gripping hole is less compared to the case in which the insertion assisting elastic member is absent.

[0009] The fixing device according to the present invention is characterized in that, in the protruding state, the fixing member is prevented from being inserted into the gripping hole in the opposite direction to the direction in which it is inserted into the gripping hole by contacting the locking surface.

[0010] The fixing device according to the present invention is characterized in that, in the pressing state, the member to be fixed can move in the direction in which it is inserted into the gripping hole.

[0011] The fixing device according to the present invention is characterized in that, in the pressing state, as the fixed member is pushed in the opposite direction to the direction in which it was inserted into the gripping hole, the frictional force between the fixed member and the locking surface causes the locking member to rotate in the rotational direction that results in the protruding state, thereby restricting the fixed member from moving in the opposite direction to the direction in which it was inserted into the gripping hole.

[0012] In the fixing device according to the present invention, as the locking member extends outward from the main body, an operating portion is formed on the locking member on the side opposite to the locking surface with respect to the rotation axis, and when the operating portion is operated, the locking member changes from the protruding state or the pressing state to a housed state in which the locking surface is contained within the inner circumferential surface.

[0013] The fixing device according to the present invention is characterized in that, of the locking surface portion, the upper side in the rotational direction that protrudes from the contact portion between the locking surface portion and the fixed member extends beyond the circumference passing through the contact portion with respect to the rotation axis.

[0014] The fixing device according to the present invention is characterized in that the rotation axis is located at a position offset from the center in a direction perpendicular to the direction in which the locking member extends from the rotation axis toward the locking surface, in the opposite direction to the direction in which the member to be fixed is inserted into the gripping hole. [Effects of the Invention]

[0015] The fixing device according to the present invention comprises a main body having a gripping hole into which a rod-shaped member to be fixed is inserted, and a locking surface having an exposed locking surface on the inner circumferential surface of the gripping hole, which rotates around a rotation axis perpendicular to the gripping hole, changing from a protruding state where the locking surface protrudes from the inner circumferential surface when the member to be fixed is not inserted into the gripping hole, to a pressing state where the locking surface is pressed against the member to be fixed when the member to be fixed is inserted into the gripping hole, and a rotation on the opposite side of the locking surface with respect to the rotation axis where it protrudes The device has a locking elastic member that is compressed while the locking member is pressed in the direction of rotation, and an insertion assist elastic member that is compressed while the locking member is pressed in the direction of rotation opposite to the direction of rotation where it protrudes relative to the axis of rotation. When the member to be fixed is inserted into the gripping hole, the locking surface is pressed by the member to be fixed, and the locking member rotates against the restoring force of the locking elastic member according to the restoring force of the insertion assist elastic member, so that the locking member is pressed against the gripping hole at the same time as the member to be fixed is inserted into the gripping hole. In other words, the restoring force of the insertion assist elastic member is added to the force with which the member to be fixed presses against the locking surface, making it easier for the locking member to rotate. Therefore, the user only needs to insert the member to be fixed into the gripping hole, and the locking member will rotate and the member to be fixed will pass through the gripping hole. In other words, the user does not need to operate the locking member. Thus, it is easy to operate.

[0016] In the present invention, the degree to which the locking surface protrudes from the gripping hole is reduced when the elastic insertion assist member is not present. That is, when the locking member is pushed by the elastic insertion assist member when it is in the protruding state, the degree to which the locking surface protrudes from the gripping hole is reduced. Therefore, when the locking surface is pressed against the member to be fixed, the locking member rotates easily. Thus, it is easy to operate.

[0017] In the fixing device according to the present invention, when the fixing member is in a protruding state, insertion of the fixing member into the gripping hole in the opposite direction to the direction in which it was inserted into the gripping hole is prevented by the fixing member contacting the locking surface. Therefore, insertion of the fixing member into the gripping hole in the wrong direction is prevented.

[0018] The fixing device according to the present invention allows the member to be fixed to move in the direction in which it would be inserted into the gripping hole when pressed against it. That is, even when pressed against it, the locking member is pressed by the insertion assisting elastic member, making the locking member easier to rotate. Therefore, the user can simply press the member to be fixed, causing the locking member to rotate and the member to be fixed to move within the gripping hole. In other words, the user does not need to operate the locking member. Thus, it is easy to operate.

[0019] In the fixing device according to the present invention, when the fixing member is pressed against the surface, the locking member rotates in a rotational direction in which it protrudes due to the frictional force between the fixing member and the locking surface, following the direction in which the fixing member is pressed against the surface in which it is inserted into the gripping hole. This restricts the fixing member from moving in the direction in which it is inserted into the gripping hole. In other words, the locking member bites into the gap between the fixing member and the gripping hole like a wedge. Therefore, the pressing state becomes robust.

[0020] In the fixing device according to the present invention, the locking member extends outward from the main body, and an operating part is formed on the side of the locking member opposite to the locking surface with respect to the rotation axis. When the operating part is operated, the locking member changes from a protruding or pressed state to a retracted state in which the locking surface is contained within the inner circumferential surface. In other words, the restoring force of the insertion assist elastic member is added to the force applied by the user to the operating part, making it easier to rotate the locking member. Therefore, it is easy to operate.

[0021] In the fixing device according to the present invention, the upper side of the locking surface that protrudes from the contact portion between the locking surface and the fixed member in the direction of rotation extends beyond the circumference passing through the contact portion with respect to the axis of rotation. When the locking surface repeatedly contacts the fixed member and wears down, the position of the locking member in the pressing state gradually tilts toward the direction of rotation in which it protrudes. However, because the locking surface is wider by the amount of the protruding portion of the locking surface, the service life of the locking member is extended.

[0022] In the fixture according to the present invention, the rotation axis is offset from the center in the direction orthogonal to the direction in which the locking member extends from the axis toward the locking surface portion, in the direction opposite to the direction when the fixed member is inserted into the gripping hole. That is, since the locking surface portion is wide by the amount of deviation of the rotation axis from the stop of the locking member, the service life of the locking member is long.

Brief Description of the Drawings

[0023] [Figure 1] FIG. 1 is an external perspective view of the state of use of the fixture according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the state of use of the fixture according to an embodiment of the present invention. [[ID=??]] [Figure 3] FIG. 3 is a cross-sectional side view of the fixture according to an embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional side view of the state of use of the fixture according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0024] Hereinafter, the fixture according to an embodiment of the present invention will be described based on the drawings. FIGS. 1 and 2 show the fixture 2 according to an embodiment of the present invention. In the following description, as shown in FIG. 1, the longitudinal direction of the fixed member 1 to which the fixture 2 is fixed is taken as the front or rear, and the directions orthogonal to the fixed member 1 are taken as the upper, lower, right, and left directions.

[0025] As shown in FIGS. 1 and 2, the fixture 2 is attached to and fixed to the fixed member 1 having a cylindrical rod shape, and prevents a drum or the like (not shown) passed through the fixed member 1 from coming out of the fixed member 1. The fixture 2 has a main body portion 3 attached to the fixed member 1, a locking member 18 connected to the main body portion 3 via a shaft member 17, and locking elastic members 24 and insertion assisting elastic members 25 disposed between the locking member 18 and the main body portion 3.

[0026] Note: There seems to be a typo in the original text where "Item ID = 12" has a wrong tag "<0??0092>", which is corrected in the translation as " ". Also, the "??" in the translation of "Item ID = 12" is just to show the position of the corrected part in the original text.The locking member 18, the locking elastic member 24, and the insertion assisting elastic member 25 determine the orientation in which the fixing device 2 is attached to the member to be fixed 1 (hereinafter, for convenience, it will be explained as if the member to be fixed 1 is passed through the fixing device 2). That is, the member to be fixed 1 is passed through the fixing device 2 from the rear and is movable toward the front (hereinafter, the direction in which the member to be fixed 1 is passed through the fixing device 2 from the rear toward the front will be referred to as the "insertion direction." See the arrow labeled D1.). On the other hand, the member to be fixed 1 is generally restricted from being passed through the fixing device 2 from the front (hereinafter, the direction opposite to the insertion direction will be referred to as the "removal direction." See the arrow labeled D2.).

[0027] The main body 3 has six surfaces: a front surface 4, a rear surface 5, a left side surface 6, a right side surface 7, an upper surface 8, and a lower surface 9. The front surface 4, rear surface 5, left side surface 6, and right side surface 7 are flat, while the upper surface 8 and lower surface 9 are curved so as to protrude outward. The outer shape of the main body 3 is arbitrary. The main body 3 has a gripping hole 10 through which the fixed member 1 passes, a groove 11 to which the locking member 18 is attached, and an axial hole 16 through which the shaft member 17 passes. The gripping hole 10 is cylindrical in shape and penetrates the center of the front surface 4 and rear surface 5 of the main body 3 in the front-to-back direction. The groove 11 is formed on the front surface 4 and extends from the gripping hole 10 to the upper surface 8. Specifically, the groove 11 has a rear inner surface 12, a left inner surface 13, and a right inner surface 14, and a groove space 15 is formed inside each of the inner surfaces 12, 13, and 14. The groove space 15 is connected to the gripping hole 10 and is open on the front surface 4 and the top surface 8. The shaft hole 16 is cylindrical and penetrates the left and right sides 6 and 7 of the main body 3 in the left-right direction. The position of the shaft hole 16 is above the gripping hole 10, and the shaft hole 16 penetrates the groove 11. The position of the shaft hole 16 and the position of the gripping hole 10 are perpendicular to each other with a gap between them vertically. The shaft member 17 passes through the shaft hole 16.

[0028] The locking member 18 is prism-shaped and has a locking surface portion 19 at its lower end. The locking member 18 is housed in the groove space 15 of the main body portion 3, and the shaft member 17 passes through it. Therefore, the locking member 18 rotates with the shaft member 17 as its axis of rotation, with the axis of rotation being perpendicular to the gripping hole 10 (fixed member 1). The locking surface portion 19 is exposed on the inner circumferential surface 26 of the gripping hole 10. The upper end of the locking member 18 extends upward relative to the shaft member 17, on the opposite side of the locking surface portion 19, and protrudes to the outside of the main body portion 3. Therefore, the upper end of the locking member 18 becomes an operating portion 23 that can be hooked with the user's fingers, etc. An elastic locking member 24 and an elastic insertion assisting member 25 are attached between the back surface of the locking member 18 and the rear inner surface portion 12 of the groove portion 11 of the main body portion 3. The locking elastic member 24 and the insertion assist elastic member 25 are coil springs.

[0029] Here, the locking member 18, the locking elastic member 24, and the insertion assisting elastic member 25 will be described in detail based on the drawings. Figures 3 and 4 show cross-sections of the fixing device 2. Figure 3 shows a cross-section of the fixing device 2 when the member to be fixed 1 is not passed through the gripping hole 10, and Figure 4 shows a cross-section of the fixing device 2 when the member to be fixed 1 is passed through the gripping hole 10.

[0030] As shown in Figures 3 and 4, the locking member 18 changes between a protruding state (see Figure 3), a pressed state (see Figure 4), or a retracted state (not shown) by rotating around the shaft member 17 as the axis of rotation. As shown in Figure 3, in the protruding state, the locking surface portion 19 protrudes from the inner circumferential surface 26 of the gripping hole 10 when the material to be fixed 1 is not inserted into the gripping hole 10. As shown in Figure 4, in the pressed state, the locking surface portion 19 is pressed against the material to be fixed 1 when the material to be fixed 1 is inserted into the gripping hole 10. In the retracted state, the locking surface portion 19 is housed within the inner circumferential surface 26 of the gripping hole 10 and does not protrude from the inner circumferential surface 26.

[0031] The position of the shaft member 17 relative to the locking member 18 (in other words, the rotation axis A of the locking member 18) is shifted backward from the center. Specifically, the rotation axis A of the locking member 18 is located at a position shifted in the withdrawal direction D2 from the center of the shaft member 17 in the direction perpendicular to the direction extending from the center toward the locking surface portion 19 (hereinafter referred to as "front-to-back width W").

[0032] The locking surface 19 of the locking member 18 is curved so as to protrude downward, but the curved surface of the locking surface 19 is not symmetrical in the front-to-back direction. Because the locking surface 19 is curved, the contact portion 20, which is the part that contacts the fixed member 1, is not the entire surface of the locking surface 19 but only a part of it. The front portion 21, which is the part in front of the contact portion 20, protrudes outward to a greater extent than the rear portion 22, which is the part behind the contact portion 20. That is, the front portion 21 protrudes beyond the circumference C that passes through the contact portion 20 with the rotation axis A as the center. Therefore, the length L1 from the rotation axis A to the rear portion 22 is different from the length L2 from the rotation axis A to the front portion 21, with length L2 being longer than length L1.

[0033] The locking elastic member 24 is positioned above the shaft member 17, on the opposite side from the locking surface 19, while the insertion assist elastic member 25 is positioned below the shaft member 17, on the side of the locking surface 19. Both the locking elastic member 24 and the insertion assist elastic member 25 are compressed and sandwiched between the back surface of the locking member 18 and the rear inner surface 12 of the groove 11 of the main body 3. Therefore, the locking elastic member 24 compresses the locking member 18 in a direction that tilts it forward (left rotation direction in the figure, see the arrow labeled RD1). When the locking member 18 rotates in this direction, the locking surface portion 19 of the locking member 18 protrudes from the inner circumferential surface 26 of the gripping hole 10, resulting in a protruding state (hereinafter, the rotation direction in which the protruding state occurs will be referred to as the "locking rotation direction RD1"). Therefore, the locking elastic member 24 compresses the locking member 18 while pushing it in the locking rotation direction RD1, thereby pushing the locking member 18 into a protruding state.

[0034] On the other hand, the insertion assist elastic member 25 compresses the locking member 18 in a direction that tilts it backward (right rotation direction in the figure, see the arrow labeled RD2). When the locking member 18 rotates in this direction, the locking surface portion 19 of the locking member 18 fits into the inner circumferential surface 26 of the gripping hole 10, thus entering a pressed or retracted state (hereinafter, the rotation direction in which the pressed or retracted state is entered will be referred to as the "non-locking rotation direction RD2"). Therefore, the insertion assist elastic member 25 compresses the locking member 18 in a direction that pushes it toward the non-locking rotation direction RD2, pressing the locking member 18 so that it enters a pressed or retracted state.

[0035] The locking elastic member 24 and the insertion assist elastic member 25 have different spring constants. Specifically, the spring constant of the locking elastic member 24 is greater than that of the insertion assist elastic member 25. Therefore, when the locking member 18 is in its protruding state, the elastic forces of each elastic member 24 and 25 are balanced. The magnitude of the spring constant is determined by the material, size, length, etc., of each elastic member 24 and 25.

[0036] If the insertion assist elastic member 25 were absent, the restoring force of the locking elastic member 24 would cause the locking member 18 to rotate in the locking rotation direction RD1, maintaining its protruding state, and the degree to which the locking surface portion 19 protrudes from the inner circumferential surface 26 of the gripping hole 10 would increase. However, with the presence of the insertion assist elastic member 25, the restoring force of the insertion assist elastic member 25 is subtracted from the restoring force of the locking elastic member 24, thus reducing the degree to which the locking surface portion 19 protrudes from the inner circumferential surface 26 of the gripping hole 10.

[0037] The fixing device 2 is configured as described above. Next, the procedure for using the fixing device 2 will be explained along with its function and effects.

[0038] As shown in Figure 3, in the protruding state, the locking surface portion 19 of the locking member 18 protrudes from the inner circumferential surface 26 of the gripping hole 10. When the member to be fixed 1 is inserted into the gripping hole 10 in the insertion direction D1 from the rear surface 5 to the front surface 4 of the main body portion 3, the locking surface portion 19 is pushed from the tip portion of the member to be fixed 1, and the locking member 18 rotates in the non-locking rotation direction RD2 against the restoring force of the locking elastic member 24, according to the restoring force of the insertion assisting elastic member 25, and the member to be fixed 1 is inserted into the gripping hole 10. At the same time, as shown in Figure 4, the locking member 18 is in a pressing state. In other words, in the protruding state, the locking member 18 is pressed by the insertion assisting elastic member 25, so the degree to which the locking surface portion 19 protrudes from the gripping hole 10 is small. Furthermore, the restoring force of the insertion assisting elastic member 25 is added to the force with which the fixed member 1 pushes the locking surface portion 19, making it easier for the locking member 18 to rotate in the non-locking rotation direction RD2. Therefore, the user can simply insert the fixed member 1 into the gripping hole 10, and the locking member 18 will rotate, allowing the fixed member 1 to pass through the gripping hole 10. In other words, the user does not need to operate the locking member 18. Thus, it is easy to operate.

[0039] On the other hand, insertion of the fixed member 1 into the gripping hole 10 in the insertion / removal direction D2 from the front surface 4 to the rear surface 5 of the main body 3 is restricted because the fixed member 1 comes into contact with the locking surface 19. In particular, because the front portion 21 of the locking surface 19 protrudes outward to a greater extent than the rear portion 22, the tip portion of the fixed member 1 comes into contact with the front portion 21 and gets caught. Therefore, insertion of the fixed member 1 into the gripping hole 10 in the wrong direction (removal direction D2) is prevented.

[0040] As shown in Figure 4, in the pressed state, the fixed member 1 can move in the insertion direction D1. Even in the pressed state, the locking member 18 is pressed by the insertion assisting elastic member 25, making it easier for the locking member 18 to rotate in the non-locking rotation direction RD2. Therefore, simply by the user pressing the fixed member 1, the locking member 18 rotates in the non-locking rotation direction RD2, and the fixed member 1 moves within the gripping hole 10 while its outer surface slides against the locking surface portion 19. In other words, the user does not need to operate the locking member 18. Thus, it is easy to operate.

[0041] On the other hand, when the fixed member 1 is pushed in the removal direction D2 while pressed, the locking member 18 rotates in the locking rotation direction RD1 due to the frictional force between the fixed member 1 and the locking surface portion 19 in response to the push. In the gap between the fixed member 1 and the gripping hole 10, the locking surface portion 19 of the locking member 18 bites in like a wedge, thus restricting the fixed member 1 from moving in the removal direction D2. Therefore, the pressed state becomes robust. In particular, since the front portion 21 of the locking surface portion 19 protrudes outward to a greater extent than the rear portion 22, the front portion 21 of the locking surface portion 19 bites into the outer surface of the fixed member 1, making the pressed state even more robust.

[0042] When the locking member 18 is rotated in the non-locking rotation direction RD2 by operating the operating part 23 while it is pressed against the surface, the locking member 18 rotates in the non-locking rotation direction RD2, and the locking surface portion 19 fits into the inner circumferential surface 26 of the gripping hole 10, changing from the pressed-against-the-surface state to the retracted state. The restoring force of the insertion assist elastic member 25 is added to the force applied by the user when they press the operating part 23, making it easier for the locking member 18 to rotate. Therefore, it is easy to operate. Similarly, even if the operating part 23 is operated while the locking member 18 is in the protruding state, the locking member 18 changes from the protruding state to the retracted state.

[0043] In this embodiment, when the member to be fixed 1 is inserted into the gripping hole 10 in the protruding state, the outer surface of the member to be fixed 1 slides against the locking surface portion 19 as the member to be fixed 1 moves within the gripping hole 10, causing the locking surface portion 19 to repeatedly contact and wear down the member to be fixed 1. As the locking surface portion 19 wears down, the position of the contact portion 20 gradually shifts towards the forward portion 21, and the posture of the locking member 18 in the pressing state gradually tilts toward the locking rotation direction RD1. The forward portion 21, which is on the upper side of the locking rotation direction RD1, has a wider locking surface portion 19 because it protrudes beyond the circumference C, thus extending the service life of the locking member 18. Furthermore, since the rotation axis A of the locking member 18 is shifted backward from the center of the front-to-back width W, in other words, the area occupied by the forward portion 21 is even wider. Therefore, the service life of the locking member 18 is even longer.

[0044] In another embodiment of the present invention, the curved surface of the locking surface is symmetrical in the front-rear direction. In this case, the front portion and the rear portion are equidistant from the circumference of the rotation axis of the locking member. In other embodiments, the axis of rotation of the locking member is located in the center of the locking member.

[0045] Although embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Furthermore, various design modifications can be made to the present invention without departing from the matters described in the claims. [Explanation of symbols]

[0046] 1 Fixed member 2 Fixtures 3. Main body 4 Front 5 Rear 6. Left side 7 Right side 8 Top side 9 Bottom side 10 Gripping hole 11 Groove 12 Back inner surface 13 Left inner surface 14 Right inner surface 15 Groove space 16 shaft holes 17 Shaft member 18 Locking member 19 Locking surface part 20 Contact area (contact part) 21 Anterior part 22 Posterior part 23 Control section 24. Locking elastic member 25 Elastic member for insertion assistance 26 Inner surface A rotation axis C circumference D1 insertion direction D2 removal direction L1, L2 length RD1 locking rotation direction RD2 Unlocked Rotation Direction W Front and rear width

Claims

1. A main body portion having a gripping hole into which a rod-shaped fixed member is inserted, A locking member having a locking surface exposed on the inner circumferential surface of the gripping hole, wherein when the material to be fixed is not inserted into the gripping hole, the locking surface is in a protruding state where it protrudes from the inner circumferential surface, and when the material to be fixed is inserted into the gripping hole, the locking member changes from a protruding state where it protrudes from the inner circumferential surface to a pressing state where it is pressed against the material to be fixed, A locking elastic member is compressed on the side opposite to the locking surface portion with respect to the rotation axis, while the locking member is pressed in the direction of rotation in which it protrudes. The locking surface portion side of the rotating shaft is compressed while the locking member is pressed in the direction of rotation opposite to the direction of rotation in which it protrudes, and the insertion assist elastic member is provided. When the member to be fixed is inserted into the gripping hole, the locking surface is pushed away from the member to be fixed, and the locking member rotates against the restoring force of the locking elastic member in accordance with the restoring force of the insertion assisting elastic member, so that the locking member is in the pressed position at the same time that the member to be fixed is inserted into the gripping hole. A fastening device characterized by the following features.

2. In the aforementioned protruding state, the degree to which the locking surface protrudes from the gripping hole is less compared to the case where the insertion assisting elastic member is absent. The fastener according to feature 1.

3. In the aforementioned protruding state, the insertion of the fixed member into the gripping hole in the opposite direction to the direction in which it is inserted is restricted by the fixed member contacting the locking surface. A fixing device as described in claim 1 or 2.

4. In the aforementioned pressing state, the member to be fixed can move in the direction in which it is inserted into the gripping hole. A fixing device as described in claim 1 or 2.

5. In the pressing state, as the fixed member is pushed in the opposite direction to the direction in which it was inserted into the gripping hole, the frictional force between the fixed member and the locking surface causes the locking member to rotate in the rotational direction that results in the protruding state, and the movement of the fixed member in the opposite direction to the direction in which it was inserted into the gripping hole is restricted. A fixing device as described in claim 1 or 2.

6. As the locking member extends outward from the main body, an operating portion is formed on the side of the locking member opposite to the locking surface with respect to the rotation axis. When the operating part is operated, the locking member changes from the protruding state or the pressing state to a housed state in which the locking surface is housed in the inner circumferential surface. A fixing device as described in claim 1 or 2.

7. Of the locking surface portion, the upper side in the rotational direction that protrudes from the contact portion between the locking surface portion and the fixed member extends beyond the circumference passing through the contact portion with respect to the rotation axis. The fastener according to feature 5.

8. The rotation axis is located at a position offset from the center in a direction perpendicular to the direction in which the locking member extends from the rotation axis toward the locking surface, in the opposite direction to the orientation in which the fixed member is inserted into the gripping hole. The fastener according to feature 5.

Images