Angle adjuster and furniture using the same

Abstract

The present invention provides an angle adjuster that can avoid damage or breakage of structural parts when overloaded and can be reused after the overload is removed, and furniture using the angle adjuster. The present invention is configured as follows: it includes a support body 20, a rotating shaft 40 supported in a non-rotatable manner at one end of the support body 20, a take-up member 50 pressed against the outer peripheral surface 46 of the rotating shaft 40, and a swing body 30 in which a mounting portion 32 provided at one end is connected to the rotating shaft 40 via the take-up member 50. When the swing body 30 is overloaded, the take-up member 50 is limited in increase in frictional force with respect to the outer peripheral surface 46 of the rotating shaft 40, so that the take-up member 50 slides and rotates on the outer peripheral surface 46 of the rotating shaft 40 due to the overload.

Description

Technical Field

[0001] The present invention relates to an angle adjuster for furniture and the like, and in particular to an angle adjuster capable of preventing structural components from being damaged or broken when the furniture is overloaded. Background Art

[0002] Conventionally, as an angle adjuster for furniture, there is known a joint device having a structure that can adjust the tilt angle of a headrest or armrest of a sofa to an angle preferred by the user (see Patent Document 1).

[0003] That is, as described in Patent Document 1 Figure 2 As shown, the claw piece 4 enters the bite allowing portion 3a of the cam plate 3. Furthermore, when a predetermined load is applied to the first metal fitting 1, the claw piece 4 receives the load at the boundary step 32 between the bite preventing portions 3b and the bite preventing portions 3b.

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 4519555 Summary of the invention

[0006] However, in the above-mentioned joint device, when the first metal fitting 1 is subjected to a great overload, the cam plate 3, claw piece 4, etc., which are structural components, will also be subjected to the overload. As a result, the cam plate 3, etc. may be broken and damaged, or the cam plate 3, etc. may be plastically deformed and broken. If such damage or breakage occurs at the joint device assembled in the sofa, for example, the sofa must be disassembled for repair. In particular, when the repair is labor-intensive and the repair cost is high, there is a problem that the entire sofa has to be discarded.

[0007] In view of the above problems, the present invention provides an angle adjuster and furniture using the angle adjuster, which can avoid damage or breakage of structural components of the angle adjuster when overloaded and can be reused after the overload is removed.

[0008] In order to solve the above problems, the angle adjuster involved in the present invention is set as follows:

[0009] It includes a supporting body, a rotating shaft, a winding component, and a swinging body.

[0010] The rotating shaft is non-rotatably supported at one end of the supporting body.

[0011] The winding member is pressed against the outer peripheral surface of the rotating shaft.

[0012] The mounting portion provided at one end side of the swing body is connected to the rotating shaft via the winding member.

[0013] The winding component has:

[0014] A winding component body, the winding component body is pressed against the rotating shaft;

[0015] a substantially J-shaped take-up portion extending from the take-up member body and pressed against an outer peripheral surface of the rotating shaft; and

[0016] a supporting portion extending from the free end of the winding portion and connected to the mounting portion of the swinging body,

[0017] By the rotation of the oscillating body in the positive rotation direction, the tightening force of the take-up member relative to the outer peripheral surface of the rotating shaft is reduced, and the friction force generated by the contact between the outer peripheral surface of the rotating shaft and the inner side surface of the take-up portion of the take-up member is reduced, thereby allowing the oscillating body to rotate in the positive rotation direction, and,

[0018] By the rotation of the above-mentioned oscillating body in the reverse rotation direction, the tightening force of the take-up member relative to the outer peripheral surface of the above-mentioned rotating shaft is increased, and the friction force generated by the contact between the outer peripheral surface of the rotating shaft and the inner side surface of the take-up portion of the take-up member is increased, thereby preventing the above-mentioned oscillating body from rotating in the reverse rotation direction, and,

[0019] When the swing body is overloaded in the reverse rotation direction, the take-up member slides and rotates on the outer peripheral surface of the rotating shaft due to the overload by limiting the increase in the friction force of the take-up member with respect to the outer peripheral surface of the rotating shaft.

[0020] According to the present invention, by rotating the take-up member before the structural member undergoes plastic deformation, it is possible to obtain an angle adjuster that can avoid damage or breakage of the structural member and can be used again after the overload is removed.

[0021] As an embodiment of the present invention, the mounting portion of the swing body may be clamped by a pair of the wind-up members.

[0022] According to this embodiment, since the swinging body is clamped by the pair of wind-up members, the holding strength is increased.

[0023] As another embodiment of the present invention, an annular flange portion protruding from the outer peripheral surface of the rotating shaft may be clamped by the pair of the winding members.

[0024] According to this embodiment, since the annular flange portion of the rotating shaft is clamped by the pair of winding members, the holding strength is increased.

[0025] As another embodiment of the present invention, the following structure can also be set: the rotation of the swing body is limited by making the winding limiting shaft provided on the mounting portion of the above-mentioned swing body abut against the position limiting protrusion provided on the above-mentioned winding component body, and the increase in the friction force of the winding component relative to the outer peripheral surface of the above-mentioned rotating shaft is limited. The winding component will slide and rotate on the outer peripheral surface of the rotating shaft due to overload.

[0026] According to this embodiment, before the structural component is damaged or broken due to overload, the take-up component slides and rotates on the outer peripheral surface of the rotating shaft. Thus, it is possible to obtain an angle adjuster that can avoid damage or breakage of the structural component and can be used again after the overload is removed.

[0027] As a different embodiment of the present invention, the following structure can also be used: the rotation of the swinging body is limited by making the above-mentioned winding part abut against a position limiting protrusion provided on the above-mentioned winding part body, and the increase in the friction force of the winding part relative to the outer peripheral surface of the above-mentioned rotating shaft is limited. The winding part will slide and rotate on the outer peripheral surface of the rotating shaft due to overload.

[0028] According to this embodiment, the winding portion is brought into contact with the position limiting protrusion provided on the winding member body to limit the rotation of the swinging body. Thus, an angle adjuster with a small number of parts and assembly steps can be obtained.

[0029] As another embodiment of the present invention, the following structure can also be used: the rotation of the swing body is limited by pressing the winding limiting shaft provided on the mounting portion of the swing body against one end of the winding limiting long hole provided on the supporting portion of the winding component, and the increase in the friction force of the winding component relative to the outer peripheral surface of the rotating shaft is limited. The winding component will slide and rotate on the outer peripheral surface of the rotating shaft due to overload.

[0030] According to the present embodiment, the friction force against overload can be adjusted by appropriately selecting the position, shape, size, and number of the winding-limiting elongated holes, and thus, an angle adjuster that is easy to design and manufacture can be obtained.

[0031] The furniture according to the present invention is configured to include the angle adjuster described above.

[0032] According to the present invention, it is possible to obtain furniture that can avoid damage or breakage of structural parts of the angle adjuster and can be used again after the overload is removed. Therefore, it is no longer necessary to repair the damage or breakage of structural parts caused by overload, and it is also unnecessary to discard the entire furniture. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a perspective view for explaining an example in which the angle adjuster according to the present invention is applied to a sofa, for example.

[0034] Figure 2 for Figure 1 An enlarged perspective view of the main parts of the sofa shown.

[0035] Figure 3 It is an overall perspective view showing an initial position according to the first embodiment of the angle adjuster according to the present invention.

[0036] Figure 4 for Figure 3 An exploded perspective view of the angle adjuster shown.

[0037] Figure 5 To observe from different angles Figure 4 The exploded perspective view shown is an exploded perspective view.

[0038] Figure 6 To indicate from Figure 3 A partial front view of the angle adjuster shown in FIG. 1 with the cover and the reinforcing plate removed.

[0039] Figure 7 for Figure 6 The VII-VII line cross-sectional view is shown.

[0040] Figure 8 for Figure 6 An enlarged exploded perspective view of the main parts of the angle adjuster is shown.

[0041] Fig. 9 It is a front view showing the positional relationship of the angle adjuster according to the present invention in the initial state (first state).

[0042] Fig.10 for Fig. 9 An enlarged view of the main parts of the angle adjuster is shown.

[0043] Fig.11 To indicate from Fig. 9 The front view of the positional relationship of the second state after the initial state (first state) begins to shift.

[0044] Fig.12 for Fig.11 An enlarged view of the main parts of the angle adjuster is shown.

[0045] Fig.13 To indicate from Fig.11 The front view of the positional relationship of the 3rd state after the displacement occurs due to the overload.

[0046] Fig.14 for Fig.13 An enlarged view of the main parts of the angle adjuster is shown.

[0047] Fig.15 To indicate from Fig.11 The front view of the positional relationship in the 4th state after the state begins to change.

[0048] Fig.16 for Fig.15 An enlarged view of the main parts of the angle adjuster is shown.

[0049] Fig.17 To indicate from Fig.15 The front view of the positional relationship in the 5th state after the state begins to change.

[0050] Fig.18 for Fig.17 An enlarged view of the main parts of the angle adjuster is shown.

[0051] Fig.19 To indicate from Fig.17 The front view of the positional relationship in the 6th state after the state begins to change.

[0052] Fig. 20 for Fig.19 An enlarged view of the main parts of the angle adjuster is shown.

[0053] Fig.21 It is a front view showing the positional relationship of the angle adjuster in the initial state (first state) of the second embodiment of the present invention.

[0054] Fig. 22 for Fig.21 An enlarged view of the main parts of the angle adjuster is shown.

[0055] Fig.23 To express Fig.21 The angle adjuster is shown in a front view in the overloaded state.

[0056] Fig.24 for Fig.23 An enlarged view of the main parts of the angle adjuster is shown.

[0057] Fig.25 It is a front view showing the positional relationship of the angle adjuster in the initial state (first state) of the third embodiment of the present invention.

[0058] Fig.26 for Fig.25 An enlarged view of the main parts of the angle adjuster is shown.

[0059] Fig. 27 To express Fig.25 The angle adjuster is shown in a front view in the overloaded state.

[0060] Fig.28 for Fig. 27 An enlarged view of the main parts of the angle adjuster is shown. DETAILED DESCRIPTION

[0061] according to Figures 1 to 28 The embodiments of the angle adjuster according to the present invention are described with reference to the accompanying drawings.

[0062] like Figure 1 as well as Figure 2 As shown, the angle adjuster 10 involved in the first embodiment is applied to the armrest 2 and the headrest 3 of the sofa 1. For example, the headrest 3 is formed by installing a cushion material (not shown) on a core material 4 spanned between a pair of angle adjusters 10, 10 arranged side by side, and covering it with a cover 5 made of leather, cloth, etc.

[0063] like Figures 3 to 5 As shown, the angle adjuster 10 is roughly composed of a supporting body 20 and a swinging body 30 .

[0064] like Figure 4 As shown, the support body 20 has a shape obtained by bending a round rod material into a substantially L-shaped shape. In addition, in the support body 20, an anti-dropping washer 22 and a washer 23 are inserted into the external threaded portion 21 provided at the lower end thereof, and a base material (not shown) disposed therebetween can be fixed by a hexagonal nut 24.

[0065] Furthermore, the support body 20 can be connected to the swing body 30 ( Figure 7 ).

[0066] In the swing body 30, a rib 31 for screwing the core material 4 is bent at one end thereof, and a mounting portion 32 is provided at the other end thereof. Figure 8 As shown, the mounting portion 32 is provided with a bearing recess 33 at the center of its front end. In addition, the mounting portion 32 is provided with a lower receiving portion 34 at the lower edge of its front end, and an upper protrusion 35 at the upper edge of its front end. Furthermore, the mounting portion 32 is provided with a rivet hole 36 and an axis hole 37.

[0067] Moreover, if Figure 4 As shown, the take-up members 50, 50 arranged to sandwich the annular flange portion 42 of the rotating shaft 40 are attached to the attachment portion 32 of the swing body 30 via a pair of reinforcing plates 62, 62. Therefore, the rotating shaft 40 is located on the extension line of the swing body 30.

[0068] like Figure 8As shown, the rotating shaft 40 has a hexagonal hole 41 , and first, second, and third claws 43 , 44 , 45 are protrudingly provided at predetermined intervals on an annular flange portion 42 protrudingly provided on an outer peripheral surface 46 thereof.

[0069] The take-up member 50 is composed of a take-up member body 51, a take-up portion 52 extending from the take-up member body 51 and having a substantially L-shaped shape that can be engaged with the outer peripheral surface 46 of the rotating shaft 40, and a support portion 53 extending from the free end of the take-up portion 52. Therefore, the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 can be in surface contact ( Figure 7 ). In addition, the winding member body 51 is provided with a rivet hole 55 and a long hole 56, and a position restricting protrusion 57 is protrudingly provided. In addition, the support portion 53 is provided with a rivet hole 58.

[0070] Next, a method of assembling the angle adjuster 10 according to the first embodiment will be described.

[0071] After the take-up members 50 , 50 are assembled from both sides of the rotating shaft 40 , the mounting portion 32 of the swing body 30 is inserted between the support portions 53 , 53 of the take-up members 50 , 50 and positioned.

[0072] Then, the wind-up limiting shaft 60 is fitted into the shaft hole 37 of the mounting portion 32 , and the release shaft 61 is fitted into the long hole 56 of the wind-up member 50 .

[0073] Furthermore, reinforcing plates 62, 62 are respectively assembled on the outward surfaces of the take-up members 50, 50, and the fitting hole 62a of the reinforcing plate 62 is fitted into the take-up limiting shaft 60. Next, the first rivet 63 is inserted into the rivet hole 62b of the reinforcing plate 62, the rivet hole 58 of the take-up member 50, and the rivet hole 36 of the swinging body 30, and riveted and fixed.

[0074] Similarly, the second rivet 64 is inserted into the rivet hole 62 c of the reinforcing plate 62 and the rivet hole 55 of the take-up member 50 , and is fitted into the bearing recess 33 of the swing body 30 , and is fixed by rivet, thereby completing the assembly of the swing body 30 .

[0075] Therefore, the distance between the fulcrums of the first and second rivets 63 and 64 and the winding restriction shaft 60 remains unchanged. In addition, the release shaft 61 is held and does not fall off.

[0076] Then, the covers 70 and 72 having a front shape that can cover the entire take-up member 50 are assembled from the front and back, and they are detachably engaged with each other to form an integrated body. Next, the flanged hexagonal nut 28 is inserted from the fitting hole 71 of the cover 70, passed through the hexagonal hole 41 of the rotating shaft 40, and then protruded from the fitting hole 73 of the cover 72. Furthermore, the front end of the flanged hexagonal nut 28 protruding from the fitting hole 73 is inserted into the hexagonal hole 25 of the support body 20, and is screwed with the bolt 27 via the washer 26. As a result, the support body 20 and the swing body 30 are connected and integrated, and the rotating shaft 40 is supported relative to the support body 20 so as not to rotate.

[0077] Next, based on Figures 9 to 20 , the operation process of the angle adjuster involved in the first embodiment is described.

[0078] In the first state as the initial position, if Fig. 9 as well as Fig.10 As shown in FIG. 1 , a take-up member 50 having spring elasticity is fitted on the outer peripheral surface 46 of the rotating shaft 40. Therefore, the take-up member body 51 and the substantially J-shaped take-up portion 52 are in surface contact with the outer peripheral surface 46 of the rotating shaft 40 at a predetermined pressure, and a friction force is generated, so that the swing body 30 does not loosen. At this time, the distance between the take-up member body 51 and the take-up portion 52 is l0.

[0079] Regarding the second state, Fig.11 as well as Fig.12 As shown in FIG. 1 , if the swinging body 30 in the first state is pulled up in the direction of arrow P (positive rotation direction) and rotated, the swinging body 30 rotates with the second rivet 64 as a fulcrum. At this time, the take-up member body 51 is pressed against the outer peripheral surface 46 of the rotating shaft 40 via the second rivet 64 without displacement, but the take-up portion 52 is pulled up via the first rivet 63. Therefore, the distance between the take-up member body 51 and the take-up portion 52 is expanded to a distance l1 (> l0), and the take-up force of the take-up member 50 on the rotating shaft 40 is reduced. Therefore, the friction between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 is reduced, and the swinging body 30 can be pulled up to the tilt angle preferred by the user.

[0080] Then, for example, if the user rests his head on the headrest 3 in the second state, so that the swing body 30 bears a specified load in the arrow Q direction (reverse rotation direction), the swing body 30 will rotate with the second rivet 64 as a fulcrum. At this time, the take-up member body 51 is pressed against the outer peripheral surface 46 of the rotating shaft 40 via the second rivet 64 without displacement, but the take-up portion 52 is pulled downward via the first rivet 63. Therefore, the take-up portion 52 approaches the take-up member body 51, and the distance between the two is reduced to l2 (<l0), and the tightening force of the take-up member 50 on the rotating shaft 40 increases. Therefore, the friction force between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 increases, and the swing body 30 will not be able to rotate, so that the headrest 3 maintains the tilt angle preferred by the user. The same is true when applied to the armrest 2.

[0081] It should be noted that in the second state, when a large overload is applied in the Q direction (reverse rotation direction), the Fig.13 as well as Fig.14 The third state is shown.

[0082] That is, the swing body 30 rotates with the second rivet 64 as a fulcrum, and the take-up portion 52 is pulled further downward compared to the second state. Therefore, the distance between the take-up member body 51 and the take-up portion 52 is reduced to a distance l3 (< l2), and the take-up limiting shaft 60 abuts against the position limiting protrusion 57 of the take-up member body 51, thereby preventing the swing body 30 from rotating. As a result, the friction force between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 becomes the maximum friction force, and the friction force does not increase further.

[0083] Therefore, when the overload in the arrow Q direction (reverse rotation direction) borne by the swing body 30 exceeds the above-mentioned maximum friction force, the take-up member 50 will slide and rotate on the outer peripheral surface 46 of the rotating shaft 40. Therefore, not only the take-up member 50, but also the rotating shaft 40, the swing body 30 and other structural components will not be damaged or broken, and thus the angle adjuster 10 will not be damaged or broken.

[0084] In summary, the angle adjuster according to the present invention has the following advantages: when an overload occurs, structural components such as the take-up member 50 will not be damaged or broken, thereby avoiding damage or breakage of the angle adjuster 10 .

[0085] then, Fig.15 as well as Fig.16The fourth state shown shows that the swing body 30 is further rotated in the direction of arrow P (positive rotation direction) from the second state to a state where the swing body 30 is displaced to the maximum range of the adjustable tilt angle. At this time, the release shaft 61 is locked to the second claw portion 44 of the rotating shaft 40 and pressed against the lower receiving portion 34. In addition, the distance between the winding member body 51 and the winding portion 52 is l1.

[0086] Then, when the swinging body 30 is subjected to a load in the direction of arrow Q (reverse rotation direction), the swinging body 30 rotates with the second rivet 64 as a fulcrum. At this time, the take-up member body 51 is pressed against the outer peripheral surface 46 of the rotating shaft 40 via the second rivet 64 without displacement, but the take-up portion 52 is stretched via the first rivet 63. Therefore, the take-up portion 52 approaches the take-up member body 51 and is reduced to a distance l2 (<l0), and the tightening force of the take-up member 50 on the rotating shaft 40 increases. As a result, the friction force between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 increases, and the swinging body 30 cannot rotate. Therefore, the headrest 3 maintains the tilt angle preferred by the user.

[0087] like Fig.17 as well as Fig.18 As shown, the fifth state is a case where the swing body 30 is further rotated in the P direction (positive rotation direction) from the fourth state.

[0088] That is, if the swing body 30 is rotated, the lower receiving portion 34 moves to the upper side of the release shaft 61 locked in the second claw portion 44, and becomes locked. Therefore, the release shaft 61 is pressed against the rotating shaft 40 via the winding member body 51, and the displacement of the winding member body 51 is restricted. At the same time, the upper protrusion 35 abuts against the third claw portion 45 and is limited. As a result, the distance between the winding member body 51 and the winding portion 52 becomes l4 (> l0), and the winding force of the winding member 50 on the rotating shaft 40 is reduced. Therefore, the swing body 30 can be rotated in the direction of arrow Q (reverse rotation direction) while maintaining the state in which the friction between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the winding portion 52 is reduced.

[0089] Regarding the 6th state, Fig.19 as well as Fig. 20 As shown in FIG. 1 , if the swinging body 30 is rotated in the arrow Q direction (reverse rotation direction) from the fifth state, the winding member body 51 rotates in the reverse direction with the second rivet 64 as a fulcrum. Then, since the release shaft 61 is locked to the first claw 43 and is limited, the lower receiving portion 34 that moves above the release shaft 61 is separated from the release shaft 61. Furthermore, by rotating the swinging body 30 in the arrow Q direction (reverse rotation direction), the first state as the initial state is returned.

[0090] Thereafter, the swing body 30 can be operated by performing the same operation.

[0091] The second embodiment of the angle adjuster of the present invention is as follows Figure 21 to Figure 24 As shown, it is almost the same as the first embodiment described above.

[0092] That is, in Fig.21 as well as Fig. 22 In the first state (initial state) shown, if the swing body 30 is rotated in the direction of arrow P (positive rotation direction), the distance l0 between the take-up member body 51 and the take-up portion 52 is widened to a distance l1 (not shown). Therefore, the tightening force exerted by the take-up member body 51 and the take-up portion 52 on the rotating shaft 40 is reduced, and the friction force between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 is reduced. As a result, the swing body 30 can be adjusted to a desired tilt angle.

[0093] Then, when the swing body 30 is subjected to a normal load in the arrow Q direction (reverse rotation direction), the swing body 30 rotates with the second rivet 64 as a rotation fulcrum. At this time, the take-up member body 51 is pressed against the outer peripheral surface 46 of the rotating shaft 40 via the second rivet 64 without displacement, but the take-up portion 52 is pulled downward via the first rivet 63. Therefore, the distance between the take-up portion 52 and the take-up member body 51 is reduced, and the tightening force generated by the take-up member body 51 and the take-up portion 52 is increased. As a result, the friction force between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 is increased, and the swing body 30 is maintained at the tilt angle preferred by the user.

[0094] However, if Fig.23 as well as Fig.24 As shown, when the swing body 30 is subjected to a great overload, the take-up part 52 directly abuts against the position limiting protrusion 57 and is limited, thereby preventing the swing body 30 from rotating. Therefore, the friction force between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up part 52 becomes the maximum friction force, and the friction force does not increase further. As a result, when the swing body 30 is subjected to an overload exceeding the maximum friction force, the take-up part 50 slides on the outer peripheral surface 46 of the rotating shaft 40, and the swing body 30 rotates. As a result, not only the take-up part 50, but also the rotating shaft 40, the swing body 30 and other structural parts will not be damaged or broken, so that the angle adjuster 10 can be prevented from being damaged or broken.

[0095] The other aspects of this embodiment are substantially the same as those of the first embodiment described above, and therefore the same parts are denoted by the same reference numerals and their description is omitted.

[0096] According to the present embodiment, there is no need to provide the wind-up limiting shaft 60 , and there is an advantage that an angle adjuster with a smaller number of parts and a smaller number of assembly steps can be obtained compared with the first embodiment.

[0097] The third embodiment of the angle adjuster of the present invention is as follows Figure 25 to Figure 28 As shown, it is almost the same as the first embodiment described above.

[0098] The difference is that the wind-up restriction shaft 65 provided on the mounting portion 32 of the swing body 30 is fitted into the wind-up restriction long hole 59 provided on the support portion 53 of the wind-up member 50 .

[0099] Moreover, in Fig.25 as well as Fig.26 In the first state (initial state) shown, if the swing body 30 is rotated in the direction of arrow P (positive rotation direction), the distance between the take-up member body 51 and the take-up portion 52 is widened from the distance l0 to the distance l1 (not shown). As a result, the tightening force of the take-up member body 51 and the take-up portion 52 on the rotating shaft 40 is reduced, and the friction between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 is reduced. As a result, the swing body 30 can be adjusted to the tilt angle preferred by the user.

[0100] On the other hand, when the swing body 30 bears a normal load in the direction of arrow Q, the swing body 30 rotates with the second rivet 64 as a rotation fulcrum. At this time, the take-up member body 51 is pressed against the rotating shaft 40 without displacement, but the take-up portion 52 is pulled downward via the first rivet 63. As a result, the distance between the take-up portion 52 and the take-up member body 51 is reduced, and the tightening force generated by the take-up member body 51 and the take-up portion 52 is increased. As a result, the friction force between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the take-up portion 52 is increased, and the swing body 30 is maintained at the tilt angle preferred by the user.

[0101] However, if Fig. 27 as well as Fig.28 As shown, when the swing body 30 is overloaded in the direction of arrow Q (reverse rotation direction), the winding limit shaft 65 is pressed against one end of the winding limit long hole 59 and is limited. At this time, even if the winding part 52 and the winding component body 51 are close to each other and the distance becomes the distance l3 (<l0), the distance will not be further reduced. As a result, the friction force between the outer peripheral surface 46 of the rotating shaft 40 and the inner side surface 54 of the winding part 52 becomes the maximum friction force, and the friction force will not increase further. As a result, when the swing body 30 is overloaded with an overload exceeding the maximum friction force, the winding component 50 slides on the outer peripheral surface 46 of the rotating shaft 40, and the swing body 30 rotates. Therefore, not only the winding component 50, but also the structural components including the rotating shaft 40, the swing body 30, etc. will not be damaged or broken, so that the angle adjuster 10 can be prevented from being damaged or broken.

[0102] The other aspects of this embodiment are substantially the same as those of the first embodiment described above, and therefore the same parts are denoted by the same reference numerals and their description is omitted.

[0103] According to the third embodiment, the maximum friction force can be designed by adjusting the shape and positional relationship of the winding restriction long hole 59 and the winding restriction shaft 65. This has the advantage of being easy to design and manufacture an angle adjuster that operates stably.

[0104] Industrial Applicability

[0105] The present invention is not limited to being applied to the headrests and armrests of the sofas mentioned above, but may also be applied to furniture such as folding beds, seats in cars and airplanes, and the like.

[0106] Explanation of symbols

[0107] 1 Sofa

[0108] 2 Handrails

[0109] 3 Headrest

[0110] 4 core material

[0111] 5 Cover

[0112] 10 Angle adjuster

[0113] 20 Support

[0114] 21 External thread

[0115] 22 Anti-drop washer

[0116] 23 Washer

[0117] 24 Hexagon Nut

[0118] 25 Hexagonal hole

[0119] 27 Bolt

[0120] 28 Hexagon nut with flange

[0121] 30 Swinging body

[0122] 31 Ribs

[0123] 32 Installation

[0124] 33 Bearing recess

[0125] 34 Lower receiving part

[0126] 35 Upper protrusion

[0127] 36 Riveting holes

[0128] 37 Shaft hole

[0129] 40 Rotation axis

[0130] 41 Hexagonal hole

[0131] 42 annular flange

[0132] 43 1st claw

[0133] 44 Second claw

[0134] 45 Third claw

[0135] 46 Outer Surface

[0136] 50 Winding parts

[0137] 51 Winding component body

[0138] 52 Tightening part

[0139] 53 Support

[0140] 54 inner side

[0141] 55 Riveting holes

[0142] 56 Long hole

[0143] 57 Position limiting protrusion

[0144] 58 Riveting holes

[0145] 59 winding limit slot

[0146] 60 Winding limit shaft

[0147] 61 Release shaft

[0148] 62 reinforcement plate

[0149] 62a fitting hole

[0150] 62b Riveting hole

[0151] 62c Rivet hole

[0152] 63 No. 1 Rivet

[0153] 64 2nd Rivet

[0154] 65 Winding limit shaft

[0155] 70 Cover

[0156] 71 fitting hole

[0157] 72 Cover

[0158] 73 fitting holes

[0159] P direction Positive rotation direction

[0160] Q direction is the reverse direction of rotation.

Claims

1. An angle adjuster, characterized in that: The angle adjuster comprises: Support body; a rotating shaft, the rotating shaft being non-rotatably supported at one end of the supporting body; a take-up member, the take-up member being pressed against an outer peripheral surface of the rotating shaft; and a swinging body, wherein a mounting portion provided at one end side of the swinging body is connected to the rotating shaft via the winding member, The winding component comprises: A winding component body, wherein the winding component body is pressed against the rotating shaft; A substantially J-shaped winding portion, the winding portion extending from the winding component body and pressed against the outer peripheral surface of the rotating shaft; as well as a supporting portion extending from a free end of the winding portion and connected to a mounting portion of the swinging body, By the swinging body rotating in the positive rotation direction, the tightening force of the take-up member relative to the outer peripheral surface of the rotating shaft is reduced, and the friction force generated by the contact between the outer peripheral surface of the rotating shaft and the inner side surface of the take-up portion of the take-up member is reduced, thereby allowing the swinging body to rotate in the positive rotation direction, and, By the rotation of the swing body in the reverse rotation direction, the tightening force of the take-up member relative to the outer peripheral surface of the rotating shaft increases, and the friction force generated by the contact between the outer peripheral surface of the rotating shaft and the inner side surface of the take-up portion of the take-up member increases, thereby preventing the swing body from rotating in the reverse rotation direction, and, When the swing body is overloaded in the reverse rotation direction, the take-up member slides and rotates on the outer peripheral surface of the rotating shaft due to the overload by limiting the increase in the friction force of the take-up member with respect to the outer peripheral surface of the rotating shaft.

2. The angle adjuster according to claim 1, characterized in that: The mounting portion of the swing body is clamped by the pair of the take-up members.

3. The angle adjuster according to claim 1, characterized in that: An annular flange portion protruding from the outer peripheral surface of the rotating shaft is clamped by the pair of the winding members.

4. The angle adjuster according to claim 2, characterized in that: An annular flange portion protruding from the outer peripheral surface of the rotating shaft is clamped by the pair of the winding members.

5. The angle adjuster according to any one of claims 1 to 4, characterized in that: The rotation of the swing body is limited by making the winding limiting shaft provided on the mounting portion of the swing body abut against the position limiting protrusion provided on the winding component body, and the increase in the friction force of the winding component relative to the outer peripheral surface of the rotating shaft is limited. The winding component will slide and rotate on the outer peripheral surface of the rotating shaft due to overload.

6. The angle adjuster according to any one of claims 1 to 4, characterized in that: The tightening part is brought into contact with a position limiting protrusion provided on the tightening member body to limit the rotation of the swinging body and limit the increase in the friction force of the tightening member relative to the outer peripheral surface of the rotating shaft. The tightening member slides and rotates on the outer peripheral surface of the rotating shaft due to overload.

7. The angle adjuster according to any one of claims 1 to 4, characterized in that: The rotation of the swing body is limited by pressing the winding limiting shaft provided on the mounting portion of the swing body against one end of the winding limiting long hole provided on the supporting portion of the winding component, and the increase in the friction force of the winding component relative to the outer peripheral surface of the rotating shaft is limited. The winding component will slide and rotate on the outer peripheral surface of the rotating shaft due to overload.

8. A piece of furniture, characterized in that: A method of providing an angle adjuster according to any one of claims 1 to 7.

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