JP2013230354A - Angular adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angular adjustment device that can be downsized.SOLUTION: An angular adjustment device 71 includes a first arm 1 having a seaming member 5 and a second arm 10 having a rotational axis portion 13. One end portion 5a and the other end portion 5b of the seaming member 5 are provided on the first arm 1. The first arm 1 and the second arm 10 are connected in such a way that the second arm 10 can rotate around the rotational axis portion 13 while a seaming portion 6 of the seaming member 5 is wound around the outer periphery 13a of the rotational axis portion 13. The angular adjustment device 71 is structured such that rotation of the second arm 10 in a given rotational direction G is prevented by the action of a friction force GM, which occurs when the second arm 10 rotates in the given rotational direction G, on the seaming member 5.

Description

  The present invention relates to an angle adjuster used for furniture and the like and a reclining chair provided with the angle adjuster.

  In this specification, unless otherwise specified, “fixed position” is used to include “pivot attachment”, and “fixed position” is used to include “pivot attachment position”.

  As furniture, for example, an angle adjuster for adjusting a tilt angle of a back frame in a reclining chair is known in various configurations. For example, JP 2002-177082 (Patent Document 1), JP What was disclosed in 2006-230720 (patent document 2) and JP-A-2006-340798 (patent document 3) is known.

  These angle adjusters have a first arm and a second arm, and the first arm and the second arm are connected so that the second arm can rotate relative to the first arm. Has been. A seat frame is attached to the first arm, and a back frame is attached to the second arm. These angle adjusters are configured so that the deployment angle of the second arm with respect to the first arm can be adjusted stepwise by utilizing the engagement between the gear teeth and the ratchet pawl. Therefore, the deployment angle of the second arm could not be adjusted steplessly, and fine angle adjustment according to the user's preference and the degree of fatigue could not be performed. Also, when the second arm is rotated in the forward rotation direction (for example, the direction in which the second arm deployment angle is decreased) to adjust the deployment angle of the second arm, a “click” sound is generated, which is annoying to the surrounding people. There was a difficulty that it took.

  The angle adjuster disclosed in Japanese Patent Application Laid-Open No. 2009-45395 (Patent Document 4) can continuously adjust the deployment angle of the second arm with respect to the first arm.

  In this angle adjuster, the first arm (fixed metal fitting) is provided with a cylindrical fixed boss portion protruding in a fixed state, and the second arm (movable metal fitting) is provided with a rotating boss portion so as to be integrally rotatable. Yes. The base portion of the rotating boss portion is rotatably inserted into the fixed boss portion from the distal end side of the fixed boss portion, and the tip portion of the rotating boss portion is disposed so as to protrude from the distal end of the fixed boss portion. A torsion coil spring is extrapolated to the fixed boss portion. One end of the torsion coil spring is fixed to the tip of the rotating boss, and the other end of the torsion coil spring is fixed to the first arm. When the rotating boss portion of the second arm rotates in the reverse rotation direction, one end portion of the torsion coil spring rotates in the reverse rotation direction integrally with the rotation boss portion, thereby reducing the diameter of the torsion coil spring and fixing it. The outer peripheral surface of the boss part is tightened to prevent the second arm from rotating in the reverse rotation direction.

JP 2002-177082 A JP 2006-230720 A JP 2006-340798 A JP 2009-45395 A

  However, in this angle adjuster, the thickness dimension is determined by the total length of the protruding length of the fixed boss portion and the protruding length of the tip portion of the rotating boss portion. Therefore, the angle adjuster is downsized (thinned). It was difficult to plan.

  Further, at the time of assembling the angle adjuster, one end of the torsion coil spring is applied so that the winding force of the torsion coil spring is applied to the outer peripheral surface of the fixed boss portion over the entire adjustable range of the deployment angle of the second arm. Since it has to be fixed to the tip of the rotating boss part, the assembling work was difficult.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to provide an angle adjuster that can be reduced in size and can be easily assembled.

  The present invention provides the following means.

[1] A first arm provided with a winding member;
A second arm having a rotating shaft portion,
The rotating shaft portion is provided to be rotatable integrally with the second arm,
In the axial direction view of the rotating shaft portion, one end portion and the other end portion of the winding member are provided apart from each other on the first arm,
The first arm and the second arm are configured such that the second arm is centered on the rotation shaft portion in a state where the winding tightening portion of the tightening member is wound on the outer peripheral surface of the rotation shaft portion. Connected to be rotatable relative to
The frictional force in the positive rotation direction generated at the contact portion between the outer peripheral surface of the rotary shaft portion and the inner peripheral surface of the winding fastening portion of the winding fastening member by the rotational movement of the second arm in the positive rotational direction is the winding force. By acting on the tightening member in the loosening direction with respect to the outer peripheral surface of the rotating shaft portion, the tightening force of the tightening member on the outer peripheral surface of the rotating shaft portion decreases, and the second arm moves in the positive rotation direction. Rotation is allowed and
The friction force in the reverse rotation direction generated in the contact portion by the rotation operation of the second arm in the reverse rotation direction acts on the winding member in the winding direction with respect to the outer peripheral surface of the rotary shaft portion, thereby causing the rotation. An angle adjuster characterized in that the tightening force of the tightening member on the outer peripheral surface of the shaft portion is increased to prevent the second arm from rotating in the reverse rotation direction.

[2] The winding member has spring elasticity in the winding direction and the loosening direction,
The preceding item 1 in which the outer peripheral surface of the rotating shaft portion is always wound around by the spring elastic force of the winding member in a state where the tightening portion of the tightening member is wound around the outer peripheral surface of the rotating shaft portion. The described angle adjuster.

[3] The one end portion and the other end portion of the winding member are fixed to the first arm,
In the axial direction view of the rotating shaft part,
A fixing position of the one end of the winding member to the first arm is a first fixing position,
A fixing position of the other end of the winding member to the first arm is a second fixing position;
A linear distance between the first fixed position and the center position of the winding portion of the winding member is a first distance, and
When a linear distance between the second fixed position and the center position of the winding portion of the winding member is a second distance,
The second distance is set shorter than the first distance,
The positive rotation direction of the second arm is set to a rotation direction that unwinds the first fixed position side portion in the winding portion of the winding member from the outer peripheral surface of the rotation shaft portion, and
The reverse rotation direction of the second arm is set to a rotation direction in which the first fixed position side portion of the tightening portion of the tightening member is wound around an outer peripheral surface of the rotation shaft portion. Angle adjuster.

[4] In the axial direction view of the rotating shaft portion,
When a straight line connecting the first fixed position and the center position of the winding portion of the winding member is a reference line,
4. The angle adjuster according to claim 3, wherein the second fixed position is disposed within a range of ± 45 ° with respect to the reference line with the center position of the tightening portion as a center.

[5] In the axial direction view of the rotating shaft portion,
When a straight line connecting the first fixed position and the center position of the winding portion of the winding member is a reference line,
The second fixed position is within a range from 0 ° to 45 ° downstream of the rotation shaft portion of the second arm in the reverse rotation direction with respect to the reference line with the center position of the tightening portion as a center. 4. The angle adjuster according to item 3, which is arranged.

  [6] The angle adjuster according to any one of [1] to [5], wherein the winding member is formed separately from the first arm.

  [7] The angle adjuster according to [6], wherein the one end and the other end of the winding member are pivotally attached to the first arm.

  [8] The winding member is formed by punching from the metal base plate into the outer shape of the winding member in the thickness direction, and has spring elasticity in the winding direction and the loosening direction. 8. The angle adjuster according to any one of the preceding items 1 to 7.

  [9] The inner peripheral surface of the tightening portion of the winding member is in contact with the outer peripheral surface of the rotating shaft portion in a region of 180 ° or more centered on the axial center position of the rotating shaft portion. 9. The angle adjuster according to any one of the preceding items 1 to 8.

  [10] The angle adjustment according to any one of items 1 to 9, wherein the inner peripheral surface of the tightening portion of the tightening member is formed in a shape corresponding to the shape of the outer peripheral surface of the rotating shaft portion. vessel.

  [11] The preceding item 1 further includes a regulating unit that regulates the amount of deformation in the winding direction of the winding member that is generated when the frictional force in the reverse rotation direction acts on the winding member in the winding direction. The angle adjuster in any one of -10.

[12] The restricting means includes a restricting member, and a restricting hole provided in the rotating shaft portion so as to extend in the axial direction thereof.
The diameter of the restriction hole is set larger than the diameter of the restriction member,
The restriction member is disposed in the restriction hole,
When the amount of deformation of the tightening member in the tightening direction reaches a predetermined amount, the restricting means abuts the inner peripheral surface of the restricting hole against the restricting member, and thereby the winding of the tightening member. 12. The angle adjuster according to 11 above, wherein the amount of deformation in the fastening direction is restricted.

[13] The first arm is provided with a pair of outer plate portions that are arranged to be spaced apart from each other and face each other, and the winding member and the rotating shaft portion are arranged between the outer plate portions. And
The restriction hole is provided through the rotation shaft portion in the axial direction thereof,
The restricting member is composed of rivets,
Each outer plate portion is provided with the insertion hole for the restriction member,
13. The angle adjuster according to claim 12, wherein the both outer side plate portions are connected to each other via the restriction member that is inserted into and communicated with the insertion holes and the restriction hole.

  [14] Further, in the restricting means, the amount of deformation in the loosening direction of the winding member generated by the frictional force in the positive rotation direction acting on the winding member in the loosening direction has reached a predetermined amount. 14. The angle adjuster according to claim 12 or 13, wherein an inner peripheral surface of the restriction hole hits the restriction member, thereby restricting a deformation amount of the winding member in the loosening direction.

  [15] The first arm according to the above items 1 to 14, wherein the first arm is provided with a stopper portion that stops the rotation of the second arm in the forward rotation direction by abutment with the second arm that has been rotated to the maximum in the forward rotation direction. The angle adjuster in any one.

  [16] The angle adjuster according to any one of [1] to [15], further including release means for releasing blocking of the rotation of the second arm in the reverse rotation direction.

[17] The releasing means releases the blocking of the rotation of the second arm in the reverse rotation direction by pressing and deforming the winding member in the loosening direction so that the winding force of the winding member is reduced. A pressing member, and a rotating plate portion provided on the second arm so as to be integrally rotatable,
The pressing member is disposed so as to be movable between a pressing position that presses and deforms the winding fastening member in the loosening direction and a non-pressing position that does not press deform the winding fastening member.
The above-described item 16 is provided with a first pressing portion that presses the pressing member disposed at the non-pressing position to the pressing position when the second arm rotates to the maximum in the normal rotation direction. The described angle adjuster.

  [18] Further, the rotating plate portion is provided with a second pressing portion that presses the pressing member disposed at the pressing position to the non-pressing position when the second arm rotates in the reverse rotation direction to the maximum. 18. The angle adjuster according to item 17 above.

[19] The pressing member is disposed on the outer side of the outer peripheral surface of the other end side portion of the tightening portion of the tightening member,
On the outer peripheral surface of the other end side portion, a recess is formed to hold the pressing member at the non-pressing position.
The first arm is provided with a pressing portion that presses the pressing member arranged at the pressing position against the outer peripheral surface of the other end side portion,
The pressing portion is arranged such that a distance between the pressing portion and the outer peripheral surface of the other end side portion is smaller than a thickness dimension of the pressing member.
The pressing member is forcibly press-fitted between the pressing portion and the outer peripheral surface of the other end portion side so that the pressing member is disposed from the non-pressing position to the pressing position, whereby the pressing member is pressed. The angle adjuster according to the preceding item 17 or 18, wherein the angle adjuster is pressed against an outer peripheral surface of the other end portion side portion to cause the winding member to be pressed and deformed in the loosening direction.

[20] The first arm includes a pair of the fastening members.
The both tightening members are arranged opposite to each other with a spacer member for forming a gap between the both tightening members,
The spacer member is fixed to the first arm;
The rotating shaft portion is provided at a substantially central portion of the rotating plate portion so as to project integrally on both sides in the thickness direction of the rotating plate portion so as to be integrally rotatable.
The rotating plate portion is disposed in the gap between the both tightening members, and the rotation shaft portions are rotatably disposed inside the both tightening portions of the both tightening members,
The pressing member is disposed outside the outer peripheral surface of the other end portion side portion of the both tightening portions of the both tightening members and straddling both outer peripheral surfaces of the other end portion side portion. ,
The spacer member is provided with a pressing portion that presses the pressing member disposed at the pressing position against both outer peripheral surfaces of the other end portions.
The pressing portion is arranged such that a distance between the pressing portion and both outer peripheral surfaces of the other end side portions is smaller than a thickness dimension of the pressing member,
The pressing member is forcibly press-fitted between the pressing portion and both outer peripheral surfaces of the other end side portions so that the pressing member is disposed from the non-pressing position to the pressing position. 19. The angle adjuster according to claim 17 or 18, wherein the pressing member is pressed against both outer peripheral surfaces of the other end side portions to press and deform the winding member.

  [21] The angle adjuster according to any one of items 1 to 20, wherein a cover member that covers the winding member from at least one of the upper side and the lower side is detachably attached.

[22] The rotating shaft portion is formed separately from the second arm,
The rotation shaft portion is provided with a fitting hole having a non-circular cross section,
The second arm is provided with a fitting shaft portion having a non-circular cross section corresponding to the fitting hole so as to be integrally rotatable,
The angle according to any one of the preceding items 1 to 21, wherein the rotating shaft portion is connected to the second arm so as to be integrally rotatable by the fitting shaft portion being detachably fitted into the fitting hole. Regulator.

  [23] A reclining characterized in that a seat frame is attached to the first arm of the angle adjuster according to any one of the preceding items 1 to 22, and a back frame is attached to the second arm of the angle adjuster. Chair.

  The present invention has the following effects.

  In the angle adjuster of the above item [1], the tightening force of the tightening member acts on the outer peripheral surface of the rotating shaft portion, so the first arm is fixed in the angle adjuster disclosed in the above Japanese Patent Application Laid-Open No. 2009-45395. The boss portion is unnecessary, and thus the angle adjuster can be downsized (thinned).

  Furthermore, since the one end part and the other end part of the winding member are provided on the first arm, it is not necessary to fix the one end part of the winding member to the rotating shaft part. Therefore, the assembly work of the angle adjuster can be easily performed.

  Furthermore, since this angle adjuster allows or prevents the rotation of the second arm by increasing or decreasing the tightening force of the tightening member, it adjusts the deployment angle of the second arm with respect to the first arm steplessly. A configuration can also be adopted.

  In the preceding item [2], the winding member has spring elasticity in the winding direction and the loosening direction, so that the winding member deformed in the winding direction and the loosening direction can be reliably returned to the initial position.

  Furthermore, since the outer peripheral surface of the rotating shaft portion is always tightened by the spring elastic force of the tightening member, it is possible to prevent the second arm from being accidentally rotated in the positive rotation direction. Furthermore, when a load in the reverse rotation direction is applied to the second arm, a friction force in the reverse rotation direction can be reliably applied to the winding member, thereby reliably preventing the rotation of the second arm in the reverse rotation direction. can do.

  In the previous item [3], the frictional force in the forward rotation direction acts on the winding member in the loosening direction with certainty, so that the second arm can be reliably allowed to rotate in the forward rotation direction, and the reverse rotation direction. Thus, the frictional force reliably acts on the tightening member in the tightening direction, so that the rotation of the second arm in the reverse rotation direction can be reliably prevented.

  In the preceding item [4], the second fixed position is arranged within a range of ± 45 ° with respect to the reference line with the center position of the tightening portion as the center, so that the frictional force in the forward rotation direction is applied to the tightening member. It acts more reliably in the loosening direction, and thereby allows the rotation of the second arm in the positive rotation direction to be permitted more reliably. Furthermore, the frictional force in the reverse rotation direction acts on the winding member more reliably in the winding direction, and thereby the rotation of the second arm in the reverse rotation direction can be more reliably prevented.

  In the preceding item [5], the second fixed position is within a range from 0 ° to 45 ° to the downstream side in the reverse rotation direction of the rotation shaft portion of the second arm with respect to the reference line with the center position of the winding portion as the center. By being arranged, the frictional force in the reverse rotation direction acts on the winding member more reliably in the winding direction, thereby further reliably preventing the rotation of the second arm in the reverse rotation direction. Can do.

  In the preceding item [6], since the fastening member is formed separately from the first arm, the winding fastening member can be easily manufactured.

  In the preceding item [7], since the one end and the other end of the winding member are pivotally attached to the first arm, the winding member operates reliably in the winding direction and the loosening direction. The rotation of the arm in the predetermined rotation direction can be reliably prevented and allowed.

  In the preceding item [8], since the winding member is formed by punching the outer shape of the winding member in the thickness direction from the metal base plate, the winding member can be easily manufactured.

  Further, since the winding member has spring elasticity in the winding direction and the loosening direction, the winding member deformed in the winding direction and the loosening direction can be reliably returned to the initial position.

  In the previous item [9], the inner peripheral surface of the tightening portion of the tightening member is in contact with the outer peripheral surface of the rotating shaft portion in a region of 180 ° or more centering on the axial center position of the rotating shaft portion. Further, it is possible to reliably prevent the rotating shaft portion from falling off from the winding tightening portion.

  In the previous item [10], the inner peripheral surface of the tightening member is formed in a shape corresponding to the shape of the outer peripheral surface of the rotating shaft portion, whereby the inner peripheral surface of the tightening portion and the rotating shaft portion are formed. The contact area with the outer peripheral surface can be increased. Therefore, it is possible to obtain the friction force in the reverse rotation direction necessary for preventing the rotation of the second arm in the reverse rotation direction without increasing the diameter of the rotation shaft portion. As a result, the angle adjuster can be miniaturized. sell.

  In the previous item [11], the angle adjuster includes a restricting means for restricting the amount of deformation of the winding member in the winding direction, so that the winding member is deformed in the winding direction beyond its elastic deformation range. The plastic deformation of the winding member can be prevented, whereby the winding member can be reliably returned to the initial state.

  In the preceding item [12], plastic deformation of the winding member can be reliably prevented.

  In the previous item [13], the winding member and the rotary shaft portion are disposed between the outer side plate portions, so that the winding member and the rotary shaft portion are both operated so that the winding member and the rotary shaft portion operate normally. It can be protected by the outer plate part. Further, since the outer side plate portions are connected to each other via a regulating member made of rivets, the outer side plate portions can be prevented from being deformed in the opening direction by the regulating member, and accordingly, the tightening is performed. A member and a rotating shaft part can be reliably protected by both outer side board parts.

  In the preceding item [14], it is possible to prevent plastic deformation of the winding member due to the winding member deforming in the loosening direction beyond its elastic deformation range.

  In the previous item [15], the first arm is provided with a stopper portion that stops the rotation of the second arm in the positive rotation direction by abutting the second arm that has rotated maximum in the positive rotation direction. Can be reliably stopped at the maximum rotation position in the forward rotation direction.

  In the previous item [16], the prevention of the rotation of the second arm in the reverse rotation direction can be canceled by the releasing means.

  In the previous item [17], the rotating plate portion is provided with a first pressing portion that presses the pressing member disposed at the non-pressing position to the pressing position when the second arm rotates to the maximum in the normal rotation direction. Therefore, by rotating the second arm to the maximum in the forward rotation direction, the pressing member can be disposed at the pressing position, and therefore, the work for releasing the blocking of the rotation of the second arm in the reverse rotation direction can be easily performed. it can.

  In the previous item [18], the rotary plate portion is provided with the second pressing portion that presses the pressing member arranged at the pressing position to the non-pressing position when the second arm rotates to the maximum in the reverse rotation direction. By rotating the second arm to the maximum in the reverse rotation direction, the pressing member can be arranged at the non-pressing position, and therefore, the operation of returning the second arm to the original state can be easily performed.

  In the previous item [19], the prevention of the rotation of the second arm in the reverse rotation direction can be reliably released, and the second arm can be reliably returned to the original state.

  In the previous item [20], the same effect as in the previous item [19] is obtained. Furthermore, since the pressing member is disposed across both outer peripheral surfaces of the other end portions of the both tightening portions of the both tightening members, the pressing member is stable between the pressing position and the pressing position. It can move well. Therefore, the position of the pressing member can be switched smoothly between the pressing position and the non-pressing position, and the pressing member can be prevented from falling off.

  In the preceding item [21], the winding member can be covered with the cover member so that the winding member operates normally. Furthermore, since the cover member is detachably attached to the angle adjuster, the cover member can be easily attached.

  In the preceding item [22], the fitting shaft portion of the second arm is detachably fitted into the fitting hole of the rotating shaft portion. Therefore, the deployment angle of the second arm can be adjusted by detaching the fitting shaft portion from the fitting hole, and then rotating the fitting shaft portion with respect to the fitting hole and fitting again into the fitting hole. The deployment start angle and deployment end angle of the second arm can be changed while maintaining the range.

  In the reclining chair of the preceding item [23], the angle adjuster has the same effect as any one of the preceding items [1] to [22].

FIG. 1 is a perspective view showing a seat chair as a reclining chair to which the angle adjuster according to the first embodiment of the present invention is applied. FIG. 2 is a perspective view of the angle adjuster. FIG. 3 is a side view of the angle adjuster. FIG. 4 is a plan view of the angle adjuster. FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is an enlarged cross-sectional view of the angle adjuster. FIG. 7A is an enlarged cross-sectional view for explaining a force that is applied when the second arm of the same angle adjuster rotates in the positive rotation direction. FIG. 7B is an enlarged cross-sectional view for explaining the force acting during the rotation operation of the second arm of the same angle adjuster in the reverse rotation direction. FIG. 8 is an exploded perspective view of the angle adjuster. FIG. 9 is a perspective view of a state during the assembly of the angle adjuster. FIG. 10 is a perspective view of a state in the middle of the assembly of the angle adjuster. FIG. 11 is a partially cutaway perspective view of the angle adjuster. FIG. 12 is a perspective view of the winding member and the metal base plate of the angle adjuster. FIG. 13A is an enlarged cross-sectional view illustrating a state before one end of the winding member of the same angle adjuster is pivotally attached to the first arm. FIG. 13B is an enlarged cross-sectional view illustrating a state after one end of the winding member of the same angle adjuster is pivotally attached to the first arm. FIG. 14A is an enlarged cross-sectional view showing a case where the deployment angle of the second arm of the angle adjuster is about 180 ° and a load in the positive rotation direction is applied to the second arm. FIG. 14B is an enlarged cross-sectional view showing a case where the deployment angle of the second arm of the angle adjuster is about 135 ° and a load in the positive rotation direction is applied to the second arm. FIG. 14C is an enlarged cross-sectional view showing a case where the deployment angle of the second arm of the angle adjuster is about 135 ° and a load in the reverse rotation direction is applied to the second arm. FIG. 14D is an enlarged cross-sectional view showing a state in which the amount of deformation in the winding direction of the winding member is regulated by the regulating means. FIG. 14E is an enlarged cross-sectional view illustrating a state in the middle of pressing the pressing member from the non-pressing position to the pressing position with the first pressing portion of the rotating plate portion of the second arm. FIG. 14F is an enlarged cross-sectional view illustrating a state where the pressing member is pushed to the pressing position by the first pressing portion of the rotating plate portion of the second arm, thereby preventing the rotation of the second arm from rotating in the reverse rotation direction. FIG. 14G is an enlarged cross-sectional view showing a state where the second arm is rotated in the reverse rotation direction. FIG. 14H is an enlarged cross-sectional view illustrating a state in the middle of pressing the pressing member from the pressing position to the non-pressing position with the second pressing portion of the rotating plate portion of the second arm. FIG. 15A is a perspective view of an angle adjuster according to the second embodiment of the present invention. FIG. 15B is a side view of the angle adjuster. FIG. 15C is a cross-sectional view of the angle adjuster. FIG. 15D is an exploded perspective view of the angle adjuster. FIG. 16A is a perspective view of an angle adjuster according to a third embodiment of the present invention. FIG. 16B is a side view of the angle adjuster. FIG. 16C is an exploded perspective view of the angle adjuster. FIG. 17A is a perspective view of an angle adjuster according to a fourth embodiment of the present invention. FIG. 17B is an exploded perspective view of the angle adjuster. FIG. 17C is an enlarged cross-sectional view of the angle adjuster.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  1 to 14H are views for explaining an angle adjuster according to the first embodiment of the present invention.

  As shown in FIG. 1, the angle adjuster 71 of the first embodiment is used as a reclining chair, for example, for adjusting the tilt angle of the back frame 92 in a seating chair 90.

  The back frame 92 of the seat 90 is made of a metal round pipe material. Further, the seat frame 91 of the seat 90 is also made of a metal round pipe material. The left and right rear end portions 91a of the seat frame 91 and the left and right lower end portions 92a of the back frame 92 are a pair of left and right angles according to the first embodiment so that the tilt angle of the back frame 92 with respect to the seat frame 91 can be adjusted. The regulators 71 and 71 are connected to each other. These frames 91 and 92 are arranged inside the cushion body 93.

  The angle adjuster 71 is also called an angle adjustment fitting, and includes a first arm 1 and a second arm 10 as shown in FIGS. The first arm 1 and the second arm 10 are both made of metal, and more specifically, for example, steel. Then, the first arm 1 and the second arm 10 are configured so that the second arm 10 can rotate in both forward and reverse rotation directions within a range of a predetermined deployment angle θ relative to the first arm 1. Are connected to each other. In FIG. 5, θ is a deployment angle of the second arm 10 with respect to the first arm 1. In this angle adjuster 71, the adjustable range of the deployment angle θ of the second arm 10 is set to about 80 ° to about 180 °, for example.

  The 1st arm 1 is provided with the attaching part 2 attached to the rear-end part 91a of the seat frame 91. FIG. This attachment part 2 is pipe-shaped. And this attachment part 2 is inserted in the hollow part of the rear-end part 91a of the seat frame 91, and the rear-end part 91a of the seat frame 91 is attached to the attachment part 2 in this state by several rivets. Therefore, a plurality of rivet insertion holes 2 a are formed in the attachment portion 2.

  The base end portion of the attachment portion 2 is integrally formed with a pair of outer plate portions 3 and 3 that are arranged opposite to each other and a bottom plate portion 4 that connects the lower ends of the outer plate portions 3 and 3 together. Formed (see FIGS. 5 and 6). In the present embodiment, for convenience of explanation, the direction in which the outer side plate portions 3 and 3 are opposed to each other is defined as the “left-right direction” of the angle adjuster 71. This direction matches the thickness direction T of the angle adjuster 71 as shown in FIG. 2, and also matches the axial direction of the rotary shaft portion 13 to be described later.

  Further, the first arm 1 includes a pair of left and right winding members 5 and 5 and a spacer member 8 as shown in FIGS. The winding member 5 is formed separately from the first arm 1 and the spacer member 8. The spacer member 8 is formed separately from the first arm 1 and the winding member 5. And both the winding fastening members 5 and 5 and the spacer member 8 are arrange | positioned between both the outer side board parts 3 and 3, as shown in FIG. The configuration of these members will be described later.

  As shown in FIGS. 8 and 9, the second arm 10 is configured by integrally combining a pair of left and right second arm constituent pieces 10 a and 10 a with each other. In addition, as shown in FIG. 8, in the state before the combination of the two component pieces 10a and 10a, the combination surface of the component pieces 10a is for preventing the positional deviation between the two component pieces 10a and 10a combined with each other. A fitting convex portion 10b and a fitting concave portion 10c that can be fitted to each other are formed.

  The second arm 10 includes an attachment portion 11 that is attached to the lower end portion 92 a of the back frame 92. The attachment portion 11 has a pipe shape. And this attachment part 11 is inserted in the hollow part of the lower end part 92a of the back frame 92, and the lower end part 92a of the back frame is attached to the attachment part 11 in this state by a plurality of rivets. Therefore, a plurality of rivet insertion holes 11 a are formed in the attachment portion 11.

  A rotating plate portion 12 is integrally formed at the base end portion of the mounting portion 11, and the rotating plate portion 12 is thereby provided on the second arm 10 so as to be integrally rotatable. Further, a rotating shaft portion 13 protruding integrally on both sides in the thickness direction of the rotating plate portion 12 is integrally formed at a substantially central portion of the rotating plate portion 12, whereby the rotating shaft portion 13 is formed in the second arm 10. Are provided so as to be integrally rotatable. The rotating shaft portion 13 is composed of a boss portion having a circular cross section. The outer peripheral surface 13 a of the rotation shaft portion 13 is formed as an arc surface centered on the axis of the rotation shaft portion 13. The rotating shaft portion 13 is formed by locally pressing and bending the substantially central portion of the rotating plate portion 12.

  Here, in FIGS. 2 and 4, J indicates the axis of the rotating shaft portion 13. Furthermore, in the angle adjuster 71, the axial direction view of the rotary shaft portion 13 is a direction view along the axis J, that is, a direction view of the arrow Z.

  In the first arm 1, as shown in FIGS. 8 and 9, the pair of left and right winding members 5, 5 have the same shape and the same dimensions. Each winding member 5 is made of metal and has spring elasticity. The spacer member 8 is for forming a gap 9 corresponding to the thickness of the rotary plate portion 12 between the winding members 5 and 5 and has a plate shape. The material is a metal such as steel. And both the winding fastening members 5 and 5 are arrange | positioned on both sides of the spacer member 8 between both winding fastening members 5 and 5, as shown in FIG. 10 and 11, Therefore, both winding fastening members A gap 9 is formed between the spacers 8 and 5. A rotating plate portion 12 of the second arm 10 is disposed in the gap 9.

  As shown in FIG. 6, when viewed in the axial direction of the rotary shaft portion 13, the one end portion 5 a and the other end portion 5 b of each winding member 5 are spaced apart from each other on the outer side plate portions 3, 3 of the first arm 1. 1 rivet 25 and second rivet 26 are pivotally attached to each other so that one end portion and 5a and the other end portion 5b of each winding member 5, 5 are connected to both outer plate portions 3 of the first arm 1, The position is fixed to 3.

  That is, as shown in FIGS. 8 and 9, the first rivet 25 insertion holes 5 c, 8 a, 3 a are respectively formed in the one end 5 a of each winding member 5, the end of the spacer member 8, and each outer plate 3. Is provided. Hereinafter, these insertion holes are referred to as “first insertion holes”. The cross-sectional shape of each first insertion hole 5c, 8a, 3a is circular. As shown in FIGS. 9 and 10, the first rivet 25 having a circular cross section is inserted into the first insertion holes 5c, 8a, and 3a, and its tip is crushed into a large diameter. Thus, as shown in FIG. 6, one end portions 5a and 5a of both winding members 5 and 5 are pivotally attached to both outer plate portions 3 and 3 via first rivets 25, and both the spacer member 8 and both winding portions are wound. The fastening members 5, 5 and the outer side plate parts 3, 3 are connected via a first rivet 25. Further, as shown in FIGS. 8 and 9, the second rivet 26 insertion holes 5 d and 3 b are provided in the other end portion 5 b and each outer plate portion 3 of each winding member 5, respectively. Hereinafter, these insertion holes are referred to as “second insertion holes”. The cross-sectional shape of each of the second insertion holes 5d and 3b is circular. A second rivet insertion recess 8 b is formed on the outer peripheral edge of the spacer member 8 on the rotating shaft 13 side. Then, as shown in FIG. 10, the second rivet 26 having a circular cross section is inserted through the second insertion holes 5d and 3b and the insertion recess 8b, and its tip is crushed into a large diameter. Thus, as shown in FIG. 6, the other end portions 5b and 5b of the winding members 5 and 5 are pivotally attached to the outer side plate portions 3 and 3 via the second rivets 26, and the spacer member 8 and The winding members 5, 5 and the outer side plate portions 3, 3 are connected via a second rivet 26. Accordingly, the spacer member 8 is fixedly attached to the outer side plate portions 3 and 3 (that is, the first arm 1) by the first and second rivets 25 and 26.

  Furthermore, as shown in FIG. 9, a winding portion 6 (winding portion) that is bent in an arc shape is formed in a portion between one end portion 5 a and the other end portion 5 b of each winding member 5. Then, as shown in FIGS. 10 and 11, the rotary shaft portion 13 of the second arm 10 is disposed in a press-fitted state and rotatable inside the both tightening portions 6. Thus, the rotation shaft portion 13 is arranged inside the winding portion 6, so that the winding portion 6 of the winding member 5 is wound around the outer peripheral surface 13 a of the rotation shaft portion 13. As shown in FIG. 6, the first arm 1 and the second arm 10 are configured such that the second arm 10 has a predetermined deployment angle θ (relative to the first arm 1 around the rotation shaft portion 13. For example, they are connected so as to be rotatable in both forward and reverse rotation directions S and G within a range of θ = about 80 ° to about 180 °. In the first embodiment, for convenience of explanation, the rotation direction in which the deployment angle θ of the second arm 10 with respect to the first arm 1 is reduced is referred to as “forward rotation direction S”, and the reverse rotation direction is referred to as “reverse rotation”. It is referred to as “direction G”.

  Here, as shown in FIG. 7A, in the present embodiment, for convenience of explanation, the first arm 1 of the one end portion 5a of the winding member 5 (in detail, the first arm 1 in detail) when viewed from the axial direction of the rotary shaft portion 13. Is the first pivot position P1, and the first arm 1 of the other end 5b of the winding member 5 (specifically, the outer plate 3 of the first arm 1). ) As a fixed position to the second position P2, and the first distance L1 as the linear distance between the first position P1 and the center position P0 of the tightening portion 6 of the tightening member 5. And the linear distance between the 2nd pivot attachment position P2 and the center position P0 of the winding part 6 of the winding member 5 is made into the 2nd distance L2.

  In the figure, Q is the axial center position of the rotating shaft portion 13. In the present embodiment, Q coincides with the center position P0 of the tightening portion 6.

  As shown in the figure, the second distance L2 is set shorter than the first distance L1 (that is, L2 <L1).

  Further, the second pivot position P2 is on the center position P0 side of the tightening portion 6 with respect to the first pivot position P1 and on the first pivot position P1 side with respect to the center position P0 of the tightening portion 6. Are arranged. That is, the second pivot attachment position P2 is disposed between the first pivot attachment position P1 and the center position P0 of the tightening portion 6.

  Here, the portion between the tightening portion 6 and the one end portion 5a of the tightening member 5 is the “long side portion 6g” of the tightening member 5, and the tightening portion 6 and the other end portion 5b of the tightening member 5 are. The part between the two is referred to as the “short side portion 6 h” of the winding member 5. The long side part 6g and the short side part 6h are spaced apart from each other when the rotary shaft part 13 is viewed in the axial direction.

  Further, each of the winding members 5 is disposed in parallel with a plane perpendicular to the axis of the rotating shaft portion 13.

  In both of the angle adjusters 71 in the state shown in FIGS. 7A and 7B, the deployment angle θ (see FIG. 5) of the second arm 10 with respect to the first arm 1 is set to about 135 °. Therefore, the second arm 10 is disposed within a range in which the deployment angle θ can be adjusted.

  In the angle adjuster 71 in the state shown in FIG. 7A, when a load SK in the positive rotation direction S is applied to the second arm 10, the angle adjuster 71 is allowed to rotate in the positive rotation direction S of the second arm 10. It is configured as follows.

  That is, as shown in the figure, when a load SK in the forward rotation direction S is applied to the second arm 10, the second arm 10 tries to rotate in the forward rotation direction S around the rotation shaft portion 13. By such a rotation operation in the positive rotation direction S, the frictional force SM in the positive rotation direction S is applied to the contact portion 30 between the outer peripheral surface 13a of the rotation shaft portion 13 and the inner peripheral surface 6c of the winding portion 6 of the winding member 5. The frictional force SM is generated and acts on the tightening member 5 in the loosening direction U with respect to the outer peripheral surface 13a of the rotating shaft portion 13. Then, due to this frictional force SM, the winding member 5 is slightly deformed elastically in the loosening direction U with the first pivot position P1 and the second pivot position P2 as fixed ends (detailed rotation ends). Thereby, the winding force of the winding member 5 to the outer peripheral surface 13a of the rotating shaft part 13 decreases, and as a result, the rotation of the second arm 10 in the positive rotation direction S is allowed.

  On the other hand, in the angle adjuster 71 in the state shown in the figure, when the load GK in the reverse rotation direction G is applied to the second arm 10, the angle adjuster 71 prevents the rotation of the second arm 10 in the reverse rotation direction G. It is configured to be.

  That is, as shown in FIG. 7B, when a load GK in the reverse rotation direction G is applied to the second arm 10, the second arm 10 tries to rotate in the reverse rotation direction G around the rotation shaft portion 13. By such a rotation operation in the reverse rotation direction G, the frictional force GM in the reverse rotation direction G is applied to the contact portion 30 between the outer peripheral surface 13a of the rotation shaft portion 13 and the inner peripheral surface 6c of the tightening portion 6 of the tightening member 5. The frictional force GM is generated and acts on the tightening member 5 in the tightening direction V with respect to the outer peripheral surface 13a of the rotary shaft portion 13. Then, by this frictional force GM, the winding member 5 is elastically slightly deformed in the winding direction V with the first pivot position P1 and the second pivot position P2 as fixed ends (detailed rotation ends). Thereby, the winding force of the winding member 5 to the outer peripheral surface 13a of the rotating shaft part 13 increases, As a result, rotation of the 2nd arm 10 in the reverse rotation direction G is blocked | prevented.

  Further, as shown in FIG. 7A, the forward rotation direction S of the second arm 10 unwinds the first pivot attachment position side portion 6 a in the winding portion 6 of the winding member 5 from the outer peripheral surface 13 a of the rotating shaft portion 13. It is set in the direction of rotation. On the contrary, as shown in FIG. 7B, the reverse rotation direction G of the second arm 10 indicates that the first pivot attachment position side portion 6 a in the winding portion 6 of the winding member 5 is the outer peripheral surface of the rotary shaft portion 13. The rotation direction is set around 13a. By setting the rotation directions S and G of the second arm 10 in this manner, the frictional force SM in the positive rotation direction S is applied to the winding member 5 when the load SK in the positive rotation direction S is applied to the second arm 10. When the load GK in the reverse rotation direction G is applied to the second arm 10, the second arm 10 can be reliably allowed to rotate in the forward rotation direction S. In addition, the frictional force GM in the reverse rotation direction G acts reliably on the winding member 5 in the winding direction V, so that the rotation of the second arm 10 in the reverse rotation direction G can be reliably prevented. In addition, the 1st pivot attachment position side site | part 6a in the winding part 6 of the winding member 5 is the same meaning as the one end part site | part in the winding part 6 of the winding member 5. FIG.

  Here, the winding member 5 has spring elasticity in the winding direction V and the loosening direction U, so that even if the winding member 5 is deformed in the winding direction V or the loosening direction U, the winding member 5 attempts to return to the initial position by its own spring elastic force.

  Further, in the angle adjuster 71, the outer peripheral surface 13 a of the rotating shaft portion 13 is spring elastic force of the winding member 5 in a state where the tightening portion 6 of the tightening member 5 is wound around the outer peripheral surface 13 a of the rotating shaft portion 13. Is always tightened. A method for realizing such a state will be described below with reference to FIGS. 13A and 13B.

  In FIG. 13A, the other end portion 5 b of each winding member 5 is pivotally attached to both outer side plate portions 3, 3 of the first arm 1 via second rivets 26. On the other hand, one end portion 5a of each winding member 5 is not yet pivotally attached to both outer side plate portions 3, 3 of the first arm 1, and the first insertion hole 5c of one end portion 5a of each winding member 5 is a spacer member. The first insertion holes 8a and the first insertion holes 3a of the outer plate portions 3 are slightly shifted toward the second rivet 26 side. In this state, the rotating shaft portion 13 is closely fitted inside the winding portion 6 of each winding member 5, that is, the outer peripheral surface 13 a of the rotating shaft portion 13 is not tightened by each winding member 5. .

  Next, in order to pivot the one end portion 5 a of each winding member 5 to the outer side plate portions 3, 3 of the first arm 1, the first insertion hole 5 c of the one end portion 5 a of each winding member 5 is the first of the spacer member 8. While the winding members 5 are elastically deformed so as to coincide with the insertion holes 8a and the first insertion holes 3a of the outer side plate portions 3, 3, the second rivets 25 are inserted into the first insertion holes 3a, 5c, 8a. Forced communication and insertion. As a result, as shown in FIG. 13B, one end portion 5a of each winding member 5 is pivotally attached to both outer side plate portions 3 and 3 via the first rivets 25, and is generated along with elastic deformation of each winding member 5. The outer peripheral surface 13a of the rotating shaft portion 13 is always wound around each of the fastening members 5 by the spring elastic force of each of the fastening members 5 that has been performed. By entering such a state, it is possible to prevent the second arm 10 from inadvertently rotating in the forward rotation direction S, and when the load GK in the reverse rotation direction G is applied to the second arm 10. The frictional force GM in the reverse rotation direction G can be reliably applied to the winding member 5, and thus the rotation of the second arm 10 in the reverse rotation direction G can be reliably prevented.

  As shown in FIG. 12, the winding member 5 is punched into the outer shape (shown by a chain line) of the winding member 5 in the thickness direction T1 from a flat metal base plate 40 by a press punching apparatus (not shown). It is formed by pulling out. Therefore, the winding member 5 can be easily manufactured. Furthermore, the winding member 5 is subjected to a quenching process to increase its hardness. In the first embodiment, the metal base plate 40 is made of a steel plate such as a spring steel plate. Therefore, the winding member 5 has excellent spring elasticity in the winding direction V and the loosening direction U.

  Further, the one end portion 5 a and the other end portion 5 b of the winding member 5 are pivotally attached to the outer plate portion 3 so that the winding direction V and the loosening direction U of the winding member 5 are parallel to the surface of the metal base plate 40. Has been. Thereby, the winding member 5 has a strong spring elastic force (that is, a large spring constant). Therefore, a thin member can be used as the winding member 5, and the angle adjuster 71 can be downsized (thinned).

  Here, as shown in FIG. 7B, a straight line connecting the first pivot position P <b> 1 and the center position P <b> 0 of the tightening portion 6 of the tightening member 5 in the axial direction view of the rotating shaft portion 13 is a reference line. B. It is desirable that the second pivot position P2 is disposed within a range of ± 45 ° with respect to the reference line B with the center position P0 of the winding portion 6 as the center. By doing so, when the load SK in the forward rotation direction S is applied to the second arm 10, the frictional force SM in the forward rotation direction S acts on the winding member 5 more securely in the loosening direction U, thereby causing the second arm 10 to move. The rotation of the arm 10 in the positive rotation direction S can be permitted more reliably. Further, when a load GK in the reverse rotation direction G is applied to the second arm 10, the frictional force GM in the reverse rotation direction G acts on the winding member 5 more securely in the winding direction V, and thereby the second arm 10. The rotation in the reverse rotation direction G can be more reliably prevented. A particularly desirable range is ± 30 °. In the figure, the upstream side in the reverse rotation direction G of the rotation shaft portion 13 of the second arm 10 with respect to the reference line B is shown as “−”, and the downstream side in the reverse rotation direction G is shown as “+”.

  In particular, the second pivot attachment position P2 is + 45 ° from 0 ° with respect to the reference line B around the center position P0 of the tightening portion 6 to the downstream side in the reverse rotation direction G of the rotary shaft portion 13 of the second arm 10. It is desirable to arrange within the range. By arranging the second pivot position P2 on the downstream side in the reverse rotation direction G in this way, when the load GK in the reverse rotation direction G is applied to the second arm 10, the frictional force GM in the reverse rotation direction G is generated. It acts on the winding member 5 in the winding direction V even more reliably, thereby preventing the rotation of the second arm 10 in the reverse rotation direction G even more reliably. In the first embodiment, the second pivot position P2 is disposed within such a range, and specifically, + 0.5 ° to +5 to the downstream side in the reverse rotation direction G with respect to the reference line B. It is arranged within the range of °.

  7A, the inner peripheral surface 6c of the tightening portion 6 of the tightening member 5 is 180 ° or more centered on the outer peripheral surface 13a of the rotating shaft portion 13 and the axial center position Q of the rotating shaft portion 13. In the area of That is, when α is a contact region centered on the axial center position Q of the rotating shaft portion 13 in a state where the inner peripheral surface 6c of the tightening portion 6 is in contact with the outer peripheral surface 13a of the rotating shaft portion 13, α is 180. It is set to be greater than or equal to ° (ie α ≧ 180 °). By doing so, it is possible to reliably prevent the rotating shaft portion 13 from falling off from the tightening portion 6. The upper limit of α is not limited, but is preferably smaller than 360 ° (that is, α <360 °). A more desirable upper limit of α is 355 ° (that is, α ≦ 355 °). In the first embodiment, α is set in a range of 270 ° to 355 °. Therefore, the number of turns obtained by winding the winding portion 6 of the winding member 5 around the outer peripheral surface 13a of the rotating shaft portion 13 is one. Is smaller than

  Here, in this invention, it does not exclude that the winding part 6 of the winding member 5 is spirally wound around the outer peripheral surface 13a of the rotating shaft part 13 one or more times (for example, 1.5 to 20 turns). Absent. However, as in the first embodiment, it is particularly desirable that the number of turns around the rotating shaft portion outer peripheral surface 13a of the tightening portion 6 of the tightening member 5 is smaller than one turn. Compared to the case of one or more turns, the thickness dimension of the tightening portion 6 of the tightening member 5 can be reduced as much as possible, and thus the angle adjuster 71 can be downsized (thinned).

  Further, the inner peripheral surface 6 c of the tightening portion 6 of the tightening member 5 is formed in a shape corresponding to the outer peripheral surface 13 a of the rotating shaft portion 13, that is, an arc surface corresponding to the outer peripheral surface 13 a of the rotating shaft portion 13. It is formed with. Therefore, the inner peripheral surface 6 c of the tightening portion 6 is in surface contact with the outer peripheral surface 13 a of the rotating shaft portion 13 in the circumferential direction continuously. Thereby, the contact area of the inner peripheral surface 6c of the winding part 6 and the outer peripheral surface 13a of the rotating shaft part 13 is increased. Therefore, it is possible to obtain the frictional force GM in the reverse rotation direction G necessary for preventing the rotation of the second arm 10 in the reverse rotation direction G without increasing the diameter of the rotation shaft portion 13. Miniaturization can be achieved.

  Thus, in the angle adjuster 71 of the first embodiment, as described above, when the frictional force GM in the reverse rotation direction G acts on the winding member 5 in the winding direction V, the winding member 5 is Elastically deforms in the winding direction V. At this time, if the winding member 5 is deformed in the winding direction V beyond its elastic deformation region, the winding member 5 is plastically deformed, and as a result, the winding member 5 does not return to the initial state. Thus, the normal operation of the winding member 5 is impaired. Therefore, in order to prevent such a problem from occurring, the angle adjuster 71 includes a regulating means 18 that regulates the amount of deformation of the winding member 5 in the winding direction V. The configuration of the restricting means 18 will be described below.

  As shown in FIGS. 8 to 11, the restricting means 18 includes a rod-like restricting member 19 and a restricting hole 20 provided in the distal end portion of the rotating shaft portion 13 so as to extend in the axial direction thereof. The regulating member 19 is composed of a rivet having a circular cross section. The restriction hole 20 penetrates the central portion of the tip end portion of the rotary shaft portion 13 in the axial direction. The cross-sectional shape of the restriction hole 20 is circular. The diameter of the restriction hole 20 is set larger than the diameter of the restriction member 19.

  Each outer plate portion 3 of the first arm 1 is provided with an insertion hole 3c for a regulating member 19. And while the restriction member 19 is inserted in communication with the insertion holes 3c and 3c of the outer side plate portions 3 and 3 and the restriction hole 20, the tip end portion of the restriction member 19 is crushed into a large diameter. Both the outer side plate portions 3 and 3 are connected (fastened) to each other via a regulating member 19. As shown in FIG. 6, when the load SK in the forward rotation direction S and the load GK in the reverse rotation direction G are not applied to the second arm 10, the restriction member 19 is coaxial with the center of the restriction hole 20 in the restriction hole 20. Is arranged. Therefore, an annular gap is formed between the regulating member 19 and the inner peripheral surface of the regulating hole 20 over the entire circumference of the regulating member 19. The center position of the restriction hole 20 coincides with the axial center position Q of the rotary shaft portion 13.

  In the restricting means 18, the inner peripheral surface of the restricting hole 20 strikes the restricting member 19 when the amount of deformation in the tightening direction V of the tightening member 5 due to the frictional force GM in the reverse rotation direction G reaches a predetermined amount. (See FIG. 14D), thereby restricting the amount of deformation in the winding direction V of the winding member 5, and as a result, preventing the plastic deformation of the winding member 5 in the winding direction V.

  In the angle adjuster 71, as described above, the frictional force SM in the positive rotation direction S acts on the winding member 5 in the loosening direction U, so that the winding member 5 is elastically deformed in the loosening direction U. To do. If the winding member 5 is deformed in the loosening direction U beyond its elastic deformation region, the winding member 5 is plastically deformed. As a result, the winding member 5 does not return to the initial state, and the winding member 5 normal operation is impaired. Therefore, in order to prevent the occurrence of such a problem, the restricting means 18 further includes a restricting hole when the amount of deformation in the loosening direction U of the tightening member 5 due to the frictional force SM in the forward rotation direction S reaches a predetermined amount. The inner peripheral surface of 20 abuts against the restricting member 19, thereby restricting the amount of deformation of the winding member 5 in the loosening direction U. By restricting the amount of deformation in this way, plastic deformation in the loosening direction U of the winding member 5 is prevented.

  Further, in the angle adjuster 71, the upper arm portion of the first arm 1 on the side of the rotation shaft portion 13 of the spacer member 8 has the second arm 10 that has rotated the maximum in the forward rotation direction S as shown in FIG. 14F. A stopper portion 8d that stops the rotation of the second arm 10 in the positive rotation direction S is configured.

  Further, the angle adjuster 71 includes a release means 15 that releases the blocking of the rotation of the second arm 10 in the reverse rotation direction G. The configuration of the release means 15 will be described below.

  As shown in FIGS. 8 to 11, the release means 15 includes a pressing member 16 having rigidity and the rotating plate portion 12. The pressing member 16 is made of metal such as steel and has a pin shape extending in the thickness direction T of the angle adjuster 71. The cross-sectional shape of the pressing member 16 is circular.

  The pressing member 16 presses both the tightening members 5 and 5 in the loosening direction U so as to reduce the tightening force of the both tightening members 5 and 5, and elastically deforms them to reversely rotate the second arm 10. The prevention of the rotation of G is canceled (see FIGS. 14A and 14F). Further, as shown in FIGS. 6 and 7A, the pressing member 16 includes a pressing position X where the winding members 5 and 5 are pressed and deformed in the loosening direction U, and a non-pressing position Y where the winding members 5 and 5 are not pressed and deformed. It is arranged to be movable between. In the first embodiment, the pressing member 16 has a pressing position on the outer side of the outer peripheral surfaces 6d and 6d of the other end portions 6b and 6b in the both tightening portions 6 and 6 of the both tightening members 5 and 5. It arrange | positions ranging over both the outer peripheral surfaces 6d and 6d of both the other end part side parts 6b and 6b so that the movement between X and the non-pressing position Y is possible. In addition, the other end part side part 6b in the winding part 6 of the winding member 5 has the same meaning as the second pivot attachment position side part in the winding part 6 of the winding member 5.

  A recess 6i that holds the pressing member 16 in the non-pressing position Y is formed in a portion corresponding to the non-pressing position Y of both outer peripheral surfaces 6d and 6d of the other end portions 6b and 6b. The cross-sectional shape of the recess 6 i is a shape recessed in an arc shape corresponding to the cross-sectional shape of the pressing member 16. Further, the opening edge of the recess 6i is formed to extend to the pressing position X side, whereby the recess 6i serves as a guide portion when the pressing member 16 moves from the non-pressing position Y to the pressing position X. Is also supposed to work. In addition, a pressing member 16 that moves from the non-pressing position Y toward the pressing position X is positioned near the portion corresponding to the pressing position X on the outer peripheral surfaces 6d and 6d of the other end side portions 6b and 6b. A convex portion 6j that stops at X is formed.

  The lower edge portion of the spacer member 8 of the first arm 1 on the side of the rotary shaft 13 is formed so as to protrude toward the side of the rotary shaft 13, and further, the first arm 1 is not deformed downward. It is in contact with the bottom plate part 4. The distal end portion of the lower edge portion is formed by pressing the pressing member 16 disposed at the pressing position X with both outer peripheral surfaces 6d of the other end side portions 6b and 6b of the both tightening portions 6 and 6 of the both tightening members 5 and 5. , 6 is formed. As shown in FIG. 7A, in this pressing portion 8c, the interval W between the pressing portion 8c and the outer peripheral surface 6d of the other end side portion 6b is smaller than the thickness dimension (ie, diameter) D of the pressing member 16. (That is, W <D), it is arranged at a position corresponding to the pressing position X. As a result, the pressing member 16 is forcibly press-fitted between the pressing portion 8c and the outer peripheral surface 6d of the other end side portion 6b from the non-pressing position Y, whereby the pressing member 16 is pressed by the pressing portion 8c and the other end portion. It is pressed against the outer peripheral surface 6d of the side portion 6b to loosen the tightening member 5 and to press and deform it in the direction U.

  The first pressing portion 12a and the second pressing portion 12b protrude radially outward at predetermined positions spaced apart from each other on the outer peripheral edge portion on the second pivoting position P2 side of the rotary plate portion 12 of the second arm 10. Are integrally formed. The first pressing portion 12a is a part for pressing the pressing member 16 disposed at the non-pressing position Y to the pressing position X when the second arm 10 rotates maximum in the normal rotation direction S. The second pressing portion 12b is a portion for pressing the pressing member 16 disposed at the pressing position X to the non-pressing position Y when the second arm 10 rotates maximum in the reverse rotation direction G. Further, a portion between the first pressing portion 12 a and the second pressing portion 12 b in the outer peripheral edge portion of the rotating plate portion 12 is located on the outer peripheral surface 6 d of the other end portion side portion 6 b in the winding portion 6 of the winding member 5. It is formed in a circular arc shape along.

  As described above, the pressing member 16 is disposed across the outer peripheral surfaces 6d and 6d of the other end side portions 6b and 6b of the both tightening portions 6 and 6 of the both tightening members 5 and 5. Therefore, the pressing member 16 can move stably between the pressing position X and the non-pressing position Y. Therefore, the position of the pressing member 16 can be smoothly switched between the pressing position X and the non-pressing position Y, and the pressing member 16 can be prevented from falling off.

  Next, the operation of the angle adjuster 71 of the first embodiment will be described below with reference to FIGS.

  In the angle adjuster 71 shown in FIG. 14A, the second arm 10 is arranged at the maximum deployment angle θ with respect to the first arm 1, that is, θ = about 180 °. The pressing member 16 is held in the recess 6 i and is therefore disposed at the non-pressing position Y. Further, the outer peripheral surface 13 a of the rotation shaft portion 13 of the second arm 10 is always wound around the winding member 5 by the spring elastic force of the winding member 5. When a load SK in the forward rotation direction S is applied to the second arm 10 from this state, the second arm 10 tries to rotate in the forward rotation direction S about the rotation shaft portion 13. By such a rotation operation in the positive rotation direction S, the frictional force SM in the positive rotation direction S is applied to the contact portion 30 between the outer peripheral surface 13a of the rotation shaft portion 13 and the inner peripheral surface 6c of the winding portion 6 of the winding member 5. The frictional force SM is generated and acts on the tightening member 5 in the loosening direction U with respect to the outer peripheral surface 13a of the rotating shaft portion 13. Then, due to this frictional force SM, the winding member 5 is slightly deformed elastically in the loosening direction U with the first pivot position P1 and the second pivot position P2 as fixed ends (detailed rotation ends). Thereby, the winding force of the winding member 5 to the outer peripheral surface 13a of the rotating shaft part 13 reduces, As a result, rotation of the 2nd arm in the normal rotation direction S is permitted. Therefore, when the load SK in the forward rotation direction S is applied to the second arm 10, the second arm 10 rotates in the forward rotation direction S.

  In the angle adjuster 71 shown in FIG. 14B, the second arm 10 is arranged at a position where the deployment angle θ is about 135 ° with respect to the first arm 1. When a load SK in the forward rotation direction S is applied to the second arm 10 from this state, the second arm 10 rotates in the forward rotation direction S as in the case of FIG.

  On the other hand, when a load GK in the reverse rotation direction G is applied to the second arm 10 from the state shown in FIG. 14B, the second arm 10 tries to rotate in the reverse rotation direction G around the rotation shaft portion 13 as shown in FIG. 14C. And By such a rotation operation in the reverse rotation direction G, the frictional force GM in the reverse rotation direction G is applied to the contact portion 30 between the outer peripheral surface 13a of the rotation shaft portion 13 and the inner peripheral surface 6c of the tightening portion 6 of the tightening member 5. The frictional force GM is generated and acts on the tightening member 5 in the tightening direction V with respect to the outer peripheral surface 13a of the rotary shaft portion 13. Then, by this frictional force GM, the winding member 5 is elastically deformed in the winding direction V with the first pivot position P1 and the second pivot position P2 as fixed ends (detailed rotation ends). Thereby, the winding force of the winding member 5 to the outer peripheral surface 13a of the rotating shaft part 13 increases, As a result, rotation of the 2nd arm 10 in the reverse rotation direction G is blocked | prevented. Therefore, when the load GK in the reverse rotation direction G is applied to the second arm 10, the second arm 10 does not rotate in the reverse rotation direction G.

  Furthermore, when a large load GK in the reverse rotation direction G is applied to the second arm 10, the amount of deformation in the winding direction V of the winding member 5 increases as shown in FIG. 14D, and the inner peripheral surface of the restriction hole 20 Hits the restricting member 19. Thereby, the deformation amount of the winding member 5 in the winding direction V is regulated. If a very large load GK in the reverse rotation direction G is applied to the second arm 10 from this state, the outer peripheral surface 13 a of the rotating shaft portion 13 is applied to the inner peripheral surface 6 c of the winding portion 6 of the winding member 5. On the other hand, the slip rotation is performed in the reverse rotation direction G, so that an excessive load is not applied to the winding member 5. Thereby, the winding member 5 is not plastically deformed in the winding direction V, and damage to the winding member 5 due to an excessive load applied to the winding member 5 is also prevented. Further, even when the outer peripheral surface 13a of the rotating shaft 13 slips and rotates as described above, the winding member 5 is not plastically deformed, so that a very large load GK in the reverse rotation direction G is applied to the second arm 10. When the operation is stopped, the winding member 5 returns to the initial state by its own spring elastic force and operates normally.

  When the second arm 10 is largely rotated in the forward rotation direction S in the angle adjuster 71 shown in FIG. 14B, the second arm 10 is immediately before the maximum rotation in the forward rotation direction S, as shown in FIG. The first pressing portion 12 a of the rotating plate portion 12 of the arm 10 hits the pressing member 16. When the second arm 10 rotates maximum in the forward rotation direction S, as shown in FIG. 14F, the second arm 10 strikes against the stopper portion 8d of the spacer member 8 of the first arm 1, and the second arm 10 Further rotation of the forward rotation direction S of 10 is stopped, and the pressing member 16 is pressed to the pressing position X by the first pressing portion 12a. At this time, the pressing member 16 is forcibly press-fitted between the pressing portion 8 c and the outer peripheral surface 6 d of the other end side portion 6 b in the winding portion 6 of the winding member 5. Thereby, the pressing member 16 is pressed against the outer peripheral surface 6d of the other end side portion 6b by the pressing portion 8c, and the winding member 5 is pressed in the loosening direction U to be elastically deformed. As a result, the prevention of the rotation of the second arm 10 in the reverse rotation direction G is released. Further, the pressing member 16 is held at the pressing position X by being forcibly press-fitted between the pressing portion 8c and the outer peripheral surface 6d of the other end side portion 6b, and the second arm 10 is moved in the reverse rotation direction G. The state in which the rotation prevention is released is maintained. Therefore, when a load GK in the reverse rotation direction G is applied to the second arm 10 in this state, the second arm 10 rotates in the reverse rotation direction G as shown in FIG. 14F, when the winding member 5 is deformed in the loosening direction U by the pressing member 16, the inner peripheral surface of the restriction hole 20 strikes the restriction member 19, and the loosening direction of the winding member 5 is obtained. The deformation amount of U is regulated.

  When the second arm 10 is largely rotated in the reverse rotation direction G in the angle adjuster 71 shown in FIG. 14G, the second arm 10 is immediately before the maximum rotation in the reverse rotation direction G, as shown in FIG. The second pressing portion 12 b of the rotating plate portion 12 of the arm 10 hits the pressing member 16. When the second arm 10 rotates maximum in the reverse rotation direction G, the pressing member 16 is pressed from the pressing position X to the non-pressing position Y by the second pressing portion 12b as shown in FIG. 14A. Thereby, the 2nd arm 10 is returned to the original state.

  Thus, according to the angle adjuster 71 of the first embodiment, since the rotation of the second arm 10 is prevented and allowed by increasing or decreasing the winding force of the winding member 5, the second arm with respect to the first arm 1 is prevented. The ten deployment angles θ can be adjusted steplessly. In addition, no sound is generated when the second arm 10 rotates in the positive rotation direction S, and therefore the deployment angle θ of the second arm 10 can be adjusted gently.

  Further, since the tightening force of the tightening member 5 acts on the outer peripheral surface 13a of the rotary shaft portion 13, the fixing boss portion of the first arm in the angle adjuster disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2009-45395 is unnecessary. Thus, the angle adjuster 71 can be downsized (thinned).

  Furthermore, since the one end portion 5 a and the other end portion 5 b of the winding member 5 are provided on the first arm 1, it is not necessary to fix the one end portion 5 a of the winding member 5 to the rotating shaft portion 13. Therefore, the assembly work of the angle adjuster 71 can be easily performed.

  Further, since the winding member 5 has spring elasticity in the winding direction V and the loosening direction U, the winding member 5 deformed in the winding direction V and the loosening direction U can be reliably returned to the initial position. it can.

  Furthermore, since the outer peripheral surface 13a of the rotating shaft portion 13 is always tightened by the spring elastic force of the winding member 5, it is possible to prevent the second arm 10 from rotating in the positive rotation direction S. Further, when a load GK in the reverse rotation direction G is applied to the second arm 10, the frictional force GM in the reverse rotation direction G can be reliably applied to the winding member 5, whereby the second arm 10 is reversely rotated. The rotation in the direction G can be reliably prevented.

  Further, since the one end portion 5a and the other end portion 5b of the winding member 5 are pivotally attached to the first arm 1, the winding member 5 operates reliably in the winding direction V and the loosening direction U, respectively. The rotation of the second arm 10 can be reliably prevented and allowed.

  Further, since the angle adjuster 71 is provided with the regulating means 18 that regulates the deformation amount of the winding member 5 in the winding direction V, the winding member 5 is deformed in the winding direction V beyond its elastic deformation region. Accordingly, the plastic deformation of the winding member 5 can be prevented, so that the winding member 5 can be reliably returned to the initial state.

  Furthermore, since both the winding members 5 and 5 and the rotating shaft portion 13 are disposed between the outer side plate portions 3 and 3 of the first arm 1, both the winding members 5 and the rotating shaft portion 13 operate normally. Thus, both the winding fastening members 5 and 5 and the rotary shaft portion 13 can be protected by the both outer plate portions 3 and 3. Furthermore, since both the outer side plate parts 3 and 3 are mutually connected via the regulating member 19 comprised by the rivet, it is blocked | prevented by the regulating member 19 that both the outer side plate parts 3 and 3 mutually deform | transform into an opening direction. Therefore, both the winding members 5 and 5 and the rotary shaft portion 13 can be reliably protected by the outer side plate portions 3 and 3.

  Further, since the rotary plate portion 12 is provided with the first pressing portion 12a, the pressing member 16 can be arranged at the pressing position X by rotating the second arm 10 in the forward rotation direction S to the maximum. For this reason, it is possible to easily perform the release operation for preventing the rotation of the second arm 10 in the reverse rotation direction G. Further, since the rotary plate portion 12 is provided with the second pressing portion 12b, the pressing member 16 can be arranged at the non-pressing position Y by rotating the second arm 10 in the reverse rotation direction G to the maximum. Therefore, the operation of returning the second arm 10 to the original state can be easily performed.

  In the present invention, in the angle adjuster 71 of the first embodiment, at least one of the outer peripheral surface 13a of the rotating shaft portion 13 and the inner peripheral surface 6c of the winding portion 6 of the winding member 5 is in contact with both. Processing for increasing the frictional force generated in the part 30, processing for reducing the frictional force, processing for appropriately adjusting the magnitude of the frictional force, and the like may be performed.

  15A to 15C are views for explaining an angle adjuster 72 according to the second embodiment of the present invention. In these drawings, the same reference numerals are assigned to components equivalent to those of the angle adjuster 71 of the first embodiment.

  The angle adjuster 72 includes a plate-like upper cover member 42 that covers both the fastening members 5 from the upper side, and a plate-like lower cover member 43 that covers both the fastening members from the lower side. Both the upper cover member 42 and the lower cover member 43 are made of resin.

  As shown in FIG. 15D, an elastic engagement protrusion 42 a is integrally formed on the lower surface of the upper cover member 42. An engaging recess 8f corresponding to the elastic engaging protrusion 42a is provided on the upper edge of the spacer member 8. Then, after assembling the angle adjuster 72, the elastic engagement protrusion 42a is forcibly inserted downward into the engagement recess 8f from the upper side thereof, as shown in FIG. 15C. Is engaged with the engaging recess 8f so that the upper cover member 42 is attached to the angle adjuster 72 so as to cover the winding members 5 and 5 from above. By strongly pulling the upper cover member 42 upward from this state, the elastic engagement protrusion 42a is extracted from the engagement recess 8f, and the upper cover member 42 is removed from the angle adjuster 72. As described above, the upper cover member 42 is detachably attached to the angle adjuster 72.

  As shown in FIG. 15D, a plurality of elastic press-fit protrusions 43 a are integrally formed on the upper surface of the lower cover member 43. A plurality of press-fitting holes 4 a corresponding to the elastic press-fitting protrusions 43 a are formed in the bottom plate portion 4 of the first arm 1. Then, after the angle adjuster 72 is assembled, the elastic press-fitting protrusion 43a is forced into the press-fitting hole 4a upward from the lower side thereof, as shown in FIG. 4a, so that the lower cover member 43 is attached to the angle adjuster 72 so as to cover both the winding members 5, 5 (particularly, both winding portions 6, 6) from the lower side. Yes. By strongly pulling the lower cover member 43 downward from this state, the elastic press-fitting protrusion 43a is extracted from the press-fitting hole 4a, and the lower cover member 43 is removed from the angle adjuster 72. Thus, the lower cover member 43 is detachably attached to the angle adjuster 72.

  According to the angle adjuster 72, both the tightening members 5, 5 can be covered with the upper cover member 42 and the lower cover member 43 so that the both tightening members 5, 5 operate normally. Furthermore, since each cover member 42 and 43 is detachably attached to the angle adjuster 72, the attachment work of each cover member 42 and 43 can be performed easily.

  16A to 16C are views for explaining an angle adjuster according to a third embodiment of the present invention. In these drawings, constituent elements equivalent to the angle adjuster 71 of the first embodiment are given reference numerals obtained by adding 100 to the reference numerals.

  The angle adjuster 171 is mainly used for furniture (eg, sofa) having a plurality of wooden frames. In the angle adjuster 171, the mounting portion 102 of the first arm 101 has a plate shape, and is attached to one of the two wooden frames connected to each other with a fastener such as a wood screw or a bolt. The attachment portion 111 of the second arm 110 has a plate shape and is attached to the other frame with a fastener such as a wood screw or a bolt. Therefore, a plurality of insertion holes 102a and 111a through which fasteners are inserted are drilled in the attachment portions 102 and 111, respectively.

  In the angle adjuster 171, as shown in FIG. 16C, the number of the winding members 105 is one, and the number of the outer plate portions 103 of the first arm 101 is one. The spacer member 108 has a through hole 108z for weight reduction. And the rotating shaft part 113 of the 2nd arm 110 is arrange | positioned inside the winding part 106 of the winding member 105, and the winding part 106 of the winding member 105 was wound by this on the outer peripheral surface of the rotating shaft part 113 It is in a state.

  Further, the angle adjuster 171 includes a side cover plate 150 that covers the rotating plate portion 112 of the second arm 110 from the side. The side cover plate 150 and the tightening member 105 are disposed to face each other with the rotating plate portion 112 of the second arm 110 and the spacer member 108 interposed therebetween. Further, the side cover plate 150, the spacer member 108, the winding member 105, and the outer plate portion 103 of the first arm 101 are connected via a first rivet 125 and a second rivet 126. Further, the side cover plate 150 and the outer plate portion 103 of the first arm 101 are connected to each other via a regulating member 119 formed of rivets.

  The usage of the angle adjuster 171 is the same as that of the angle adjuster 71 of the first embodiment.

  17A to 17C are views for explaining an angle adjuster according to a fourth embodiment of the present invention. In these drawings, constituent elements equivalent to those of the angle adjuster 71 of the first embodiment are given reference numerals obtained by adding 200 to the reference numerals.

  Similar to the angle adjuster 171 of the third embodiment, the angle adjuster 271 is mainly used for furniture (for example, a sofa) having a plurality of wooden frames. The mounting portion 202 of the first arm 201 has a plate shape, and is attached to one of the two wooden frames connected to each other with a fastener such as a wood screw or a bolt. The attachment portion 211 of the second arm 210 is plate-like and is attached to the other frame with a fastener such as a wood screw or a bolt. Therefore, insertion holes 202a and 211a through which fasteners are inserted are formed in the mounting portions 202 and 211, respectively.

  Moreover, in this angle adjuster 271, as shown to FIG. 17B, the number of the fastening members 205 is one, and the number of the outer side plate parts 203 of the 1st arm 201 is one. The spacer member 208 has a through hole 208z for weight reduction.

  The rotating plate 212 having the rotating shaft portion 213 is formed separately from the second arm 210. As shown in FIG. 17C, the rotation shaft portion 213 is disposed inside the winding portion 206 of the winding member 205, whereby the winding portion 206 of the winding member 205 is wound around the outer peripheral surface of the rotation shaft portion 213. It is in a state. In the figure, reference numeral 230 denotes a contact portion between the outer peripheral surface of the rotating shaft portion 213 and the inner peripheral surface of the winding fastening portion 206.

  As shown in FIG. 17B, a fitting hole 260 having a non-circular cross section is provided in the central portion of the distal end portion of the rotating shaft portion 213 so as to penetrate in the axial direction of the rotating shaft portion 213. In this embodiment, the cross-sectional shape of the fitting hole 260 is a regular polygonal shape (more specifically, a regular hexagonal shape). A fitting shaft portion 262 having a non-circular cross section corresponding to the fitting hole 260 is provided at the proximal end portion of the mounting portion 211 of the second arm 210 so as to be integrally rotatable. In the present embodiment, the cross-sectional shape of the fitting shaft portion 262 is a regular polygonal shape (more specifically, a regular hexagonal shape).

  Further, as shown in FIG. 17B, the angle adjuster 271 includes an outer case 255, a cover plate 256 for the outer case 255, and an inner side cover plate 250 that covers the winding member 205 from the side. Yes. 17B and 17C, the inner side cover plate 250, the winding member 205, the spacer member 208, and the outer plate portion 203 of the first arm 201 are connected via the first rivet 225 and the second rivet 226. It is connected. Further, these are accommodated in the outer case 255, and a cover plate 256 is attached to the opening of the outer case 255.

  The outer case 255 is provided with a through hole 255a having a circular cross section, and the inner side cover plate 250 is also provided with a through hole 250a having a circular cross section. Then, the fitting shaft portion 262 of the second arm 210 is inserted into the through holes 255a and 250a from the outside of the outer case 255, and the fitting shaft portion 262 is fitted to the rotating shaft portion 213. The hole 260 is detachably fitted.

  The cover plate 256 is provided with a through hole 256 a having a circular cross section, and the outer plate portion 203 of the first arm 201 is also provided with a through hole 203 z having a circular cross section. Inside these through holes 256 a and 203 z, a retaining screw 265 is provided from the outside of the cover plate 256 to a screw hole 263 provided at the tip of the fitting shaft portion 262. And a flat washer) 266 so as to be detachable so that the fitting shaft portion 262 is not detached from the fitting hole 260.

  In this angle adjuster 271, when attaching the frame to the attachment portion of each arm, the screw 265 is removed from the screw hole 263, the fitting shaft portion 262 is detached from the fitting hole 260, and the first arm 201 and the second arm 271 are removed. The arm 210 is separated. Next, the frame is attached to the attachment portion of each arm with a fastener such as a wood screw or a bolt. At this time, since both the arms 201 and 210 are separated, the attaching operation can be easily performed. When the attaching operation is completed, the fitting shaft portion 262 is fitted again into the fitting hole 260 and the screw 265 is screwed into the screw hole 263. Thereby, the 1st arm 201 and the 2nd arm 210 are connected mutually.

  According to the angle adjuster 271, the fitting shaft portion 262 of the second arm 210 is detachably fitted into the fitting hole 260 of the rotating shaft portion 213, so that the fitting shaft portion 262 is fitted into the fitting hole 260. Then, the fitting shaft portion 262 is rotated with respect to the fitting hole 260 and is fitted again into the fitting hole 260, thereby maintaining the adjustable range of the deployment angle of the second arm 210. The deployment start angle and deployment end angle of the second arm 210 can be changed.

  Although several embodiments of the present invention have been described above, the present invention is not limited to those shown in these embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, in the above embodiment, the angle adjuster is used as a tilt angle adjuster of the back frame of the seat chair, but in the present invention, the angle adjuster is limited to that used for the seat chair. In addition to this, for example, it may be used as an angle adjuster for an armrest in a chair with an armrest, or may be used as an angle adjuster for a footrest in a chair with a footrest, It may be used as a tilt angle adjuster for the top plate. Furthermore, it may be used for a folding bed, or may be used for a support arm device for supporting a panel such as a liquid crystal display panel or an organic EL display panel.

  Further, in the present invention, it is particularly desirable that the winding member has spring elasticity, as described in the above embodiment, but this does not exclude the fact that the winding member does not have spring elasticity. It is not excluded that is composed of chains.

  Further, the present invention does not exclude that the angle adjuster is configured so that the deployment angle of the second arm with respect to the first arm is adjusted stepwise using the technical idea of the present invention.

  The present invention is applicable to an angle adjuster used for furniture (eg, a reclining chair, a foldable bed, a foldable sofa) and the like and a reclining chair provided with the angle adjuster.

1: First arm 3: Outer plate portion 5: Winding member 5a: One end portion 5b of the tightening member: Other end portion 6 of the tightening member: Winding portion 6c: Inner peripheral surface 8 of the tightening portion: Spacer member 8c: Pressing part (release means)
8d: Stopper portion 9: Clearance 10: Second arm 12: Rotating plate portion (release means)
12a: 1st pushing part (release means)
12b: 2nd pushing part (release means)
13: Rotating shaft portion 13a: Outer peripheral surface of rotating shaft portion 15: Release means 16: Pressing member (release means)
18: Restriction means 19: Restriction member (regulation means)
20: Restriction hole (regulation means)
25: 1st rivet 26: 2nd rivet 30: Contact part 40: Metal base plate 42: Upper cover member 43: Lower cover member 71, 72: Angle adjuster S: Forward rotation direction G: Reverse rotation direction SK: Forward rotation Direction load GK: reverse rotation direction load SM: forward rotation direction friction force GM: reverse rotation direction friction force P0: center position P1 of the tightening portion of the tightening member P1: first pivot position (first fixed position) )
P2: Second pivot position (second fixed position)
L1: First distance L2: Second distance Q: Axle center position U: Loosening direction V: Winding direction X: Pressing position Y: Non-pressing position

Claims (1)

A first arm having a winding member;
A second arm having a rotating shaft portion,
The rotating shaft portion is provided to be rotatable integrally with the second arm,
One end and the other end of the tightening member are provided on the first arm,
The first arm and the second arm are configured such that the second arm is centered on the rotation shaft portion in a state where the winding tightening portion of the tightening member is wound on the outer peripheral surface of the rotation shaft portion. Connected to be rotatable relative to
The frictional force in the predetermined rotation direction generated at the contact portion between the outer peripheral surface of the rotating shaft portion and the inner peripheral surface of the winding tightening portion of the winding tightening member by the rotating operation of the second arm in the predetermined rotating direction. The angle adjuster is characterized in that the second arm is prevented from rotating in the predetermined rotation direction by acting on the winding member.

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