Angle adjustment device and furniture using the same

Abstract

We provide an angle adjustment tool that allows you to adjust to the desired angle with simple operation. [Solution] A first member 20 is rotatably supported by inserting a support shaft 40 through a first shaft hole 25 of a first joint body 22 provided at one end, and a first engaging projection 26 is provided on the joint surface of the first joint body along radial lines at equal angles centered on the first shaft hole. A second engaging projection 26 is provided on the joint surface of the second joint body 32 by inserting a support shaft through a second shaft hole 35 of the second joint body, and a second engaging projection is provided on the joint surface of the second joint body along radial lines at equal angles centered on the second shaft hole. The structure consists of a second member 30 with a protruding projection, and disc springs 42 and 44, which are biasing members mounted on the support shaft, such that the first engaging projection and the second engaging projection are constantly engaged with each other at a predetermined pressure. The angle can be adjusted by rotating at least one of the first member 20 and the second member 30 around the axis 41 of the support shaft 40, causing the first engaging projection 26 and the second engaging projection to repeatedly disengage and engage with each other.

Description

Technical Field

[0001] The present invention relates to an angle adjuster, and in particular to an angle adjuster capable of directly adjusting an angle from any position to a desired position.

Background Art

[0002] Conventionally, as an angle adjuster, for example, a first metal fitting and a second metal fitting are pivotally connected by a horizontal pivot shaft, the first metal fitting is formed with a ratchet having a plurality of teeth arranged along an arc centered on the horizontal pivot shaft, a pawl piece that engages with the ratchet to block the rotation of the two metal fittings in the unfolding direction is pivotally connected to the second metal fitting, a spring member that biases the pawl piece toward the engagement side is provided, and a cam plate that regulates the engagement of the pawl piece with the ratchet is freely rotatably and pivotally supported on the horizontal pivot shaft, Around the cam plate, there are provided a recessed engagement permitting portion, an engagement blocking portion protruding adjacent to one side of the recessed engagement permitting portion, and a return abutment portion protruding adjacent to the other side of the engagement permitting portion, The first metal fitting has a pawl abutment portion at one end side of the ratchet forming portion, the radius of which from the center of the horizontal pivot shaft is larger than that of the engagement blocking portion of the cam plate, and has a cam returning portion at the other end side of the ratchet forming portion, Normally, the pawl piece engages with the teeth of the ratchet within the engagement permitting portion of the cam plate, the engagement blocking portion of the cam plate and the pawl abutment portion of the first metal fitting are arranged above the engagement position, when one of the metal fittings rotates in the bending direction, the pawl piece sequentially engages with the next tooth within the engagement permitting portion, when one metal fitting is rotated in the bending direction beyond the ratchet engagement range, the pawl piece is pressed by the pawl abutment portion of the first metal fitting and separates from the ratchet and the cam plate, the cam plate automatically rotates under its own weight and switches to an engagement blocking posture in which the engagement blocking portion abuts against the pawl piece, thereby enabling the two metal fittings to rotate in the unfolding direction, in the rotation process in the unfolding direction, the cam returning portion of the first metal fitting presses against the return abutment portion of the cam plate, and the cam plate is configured to return to the engagement permitting posture at the rotation end (see Patent Document 1).

Prior Art Literature

Patent Literature

[0003] [Patent Document 1] Japanese Patent Publication No. 2006-34709 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, in the aforementioned joint device, in order to adjust the first fitting to a desired angle, it was necessary to rotate the first fitting in one direction to return it to its initial position, and then rotate the first fitting in the opposite direction to adjust it to the desired angle. Therefore, there is a problem in that the angle adjustment operation is time-consuming. In view of the aforementioned problems, the present invention aims to provide an angle adjustment device that can be adjusted to a desired angle with simple operation. [Means for solving the problem]

[0005] The angle adjustment device according to the present invention aims to solve the above-mentioned problems, A first member is rotatably supported by inserting a support shaft through a first shaft hole provided at one end of the first joint, and a first engaging projection is provided on the joint surface of the first joint along radial lines at equal angles centered on the first shaft hole, A second member is provided with a second shaft hole at one end of the second joint, through which the support shaft is inserted and rotatably supported, and a second engaging projection is provided on the joint surface of the second joint, along radial lines at equal angles centered on the second shaft hole. It consists of a biasing member mounted on the support shaft such that the first engaging projection and the second engaging projection are constantly engaged with each other at a predetermined pressure, The configuration allows for angle adjustment by rotating at least one of the first member and the second member around the axis of the support shaft, causing the first engaging projection and the second engaging projection to repeatedly disengage and engage with each other. [Effects of the Invention]

[0006] According to the present invention, when adjusting the angle, the first and second members can be directly changed to the desired angle in a single operation without returning them to their initial positions. Therefore, an angle adjustment tool is obtained that can be adjusted to the desired angle with simple operation.

[0007] In an embodiment of the present invention, the engaging projection may have a bottom surface that widens towards the outer edge. According to this embodiment, an angle adjustment tool is obtained that is less prone to breaking under shear force, has excellent durability, and a long lifespan.

[0008] In another embodiment of the present invention, the engaging projections may have a uniform height in the regions that interlock with each other. According to this embodiment, the so-called uneven contact is reduced, a stable operating feel is obtained, and an angle adjustment tool with high durability and a long lifespan is obtained.

[0009] In another embodiment of the present invention, at least the engaging projection of the joint may be heat-treated. According to this embodiment, an angle adjustment tool with improved wear resistance and a longer lifespan can be obtained.

[0010] In a different embodiment of the present invention, the surface hardness of the engaging projection may be at least 500 in Vickers hardness Hv. According to this embodiment, an angle adjustment tool with high wear resistance and a long lifespan can be obtained.

[0011] In another embodiment of the present invention, the biasing member may be at least one disc spring. According to this embodiment, an angle adjustment tool is obtained that can bias a pair of joints that slide against each other with a predetermined spring force, and can smoothly adjust the angle.

[0012] In another embodiment of the present invention, the biasing member may be at least one coil spring. According to this embodiment, an angle adjustment tool is obtained that can bias a pair of joints that slide against each other with a predetermined spring force, and can smoothly adjust the angle.

[0013] In an embodiment of the present invention, the biasing member may be at least one elastic resin plate. According to this embodiment, an angle adjustment tool is obtained that can bias a pair of joints that slide against each other with a predetermined spring force, and can smoothly adjust the angle.

[0014] In a different embodiment of the present invention, at least one position-regulating piece may be provided on the outer peripheral edge of at least one of the outer peripheral edges of the first joint of the first member and the second joint of the second member. According to this embodiment, an angle adjustment device is obtained that can prevent the breakage of the constituent members by restricting the rotation angle of the first member and the second member to a predetermined angle using a position regulating piece.

[0015] In another embodiment of the present invention, position-restricting pieces that can abut against each other may be provided on the outer peripheral edge of the first joint of the first member and on the outer peripheral edge of the second joint of the second member. According to this embodiment, an angle adjustment device is obtained that can prevent the breakage of the constituent members by restricting the rotation angle of the first member and the second member to a predetermined angle using a position regulating piece.

[0016] In another embodiment of the present invention, the position regulating piece provided on the outer peripheral edge of the first joint of the first member and the position regulating piece provided on the outer peripheral edge of the second joint of the second member may have different shapes and be shaped to abut each other. According to this embodiment, an angle adjustment device is obtained that prevents the breakage of the constituent members by having the position-regulating piece restrict the rotation angle of the first member and the second member to a predetermined angle.

[0017] The furniture according to the present invention is configured such that the angle adjustment device described above is attached to a rotating member. According to the present invention, when adjusting the angle, the first and second members can be directly changed to the desired angle in a single operation without returning them to their initial positions. Therefore, an angle adjustment tool is obtained that allows the angle to be changed to the desired angle with simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] [Figure 1] It is a perspective view showing a first embodiment of the angle adjuster according to the present invention. [Figure 2] It is an exploded perspective view of FIG. 1. [Figure 3] It is an exploded perspective view of FIG. 1 viewed from different angles. [Figure 4] It is a partial front view of the first member illustrated in FIG. 2. [Figure 5] It is a partial bottom view of the first member illustrated in FIG. 2. [Figure 6] It is a partially enlarged view of section A of the first member illustrated in FIG. 4. [Figure 7] It is an enlarged cross-sectional view taken along line VII-VII illustrated in FIG. 4. [Figure 8] It is a front view of the disc spring illustrated in FIG. 2. [Figure 9] It is a cross-sectional view taken along line IX-IX of the disc spring illustrated in FIG. 8. [Figure 10] It is a partially enlarged plan view of the angle adjuster shown in FIG. 1. [Figure 11] It is a partially enlarged front view of the angle adjuster illustrated in FIG. 1. [Figure 12] It is an enlarged right side view of the angle adjuster illustrated in FIG. 1. [Figure 13] It is a cross-sectional view taken along line XIII-XIII illustrated in FIG. 11. [Figure 14] It is a partially enlarged cross-sectional view taken along line XIV-XIV illustrated in FIG. 11. [Figure 15] It is a front view showing a state where the first member of the angle adjuster illustrated in FIG. 11 is rotated in one direction. [Figure 16] It is a front view showing a state where the first member of the angle adjuster illustrated in FIG. 11 is rotated in the other direction. [Figure 17] It is a perspective view showing a case where the angle adjuster according to the present invention is incorporated into a frame of a seating chair. [Figure 18] It is a front view showing the frame of the seating chair illustrated in FIG. 17. [Figure 19] Figure 17 is a perspective view showing the headrest frame of the floor chair in the lowered position. [Figure 20] Figure 19 is a front view of the frame of the floor chair shown. [Figure 21] Figure 17 is a perspective view showing the headrest frame of the floor chair in the lowered position. [Figure 22] Figure 21 is a front view of the frame of the floor chair shown. [Figure 23] This is a perspective view of the first member constituting a second embodiment of the angle adjustment device according to the present invention. [Figure 24] Figure 23 is a perspective view of the angle adjustment device showing the first member rotated upward. [Figure 25] Figure 23 is a front view of the angle adjustment device showing the first member rotated upward. [Figure 26] Figure 23 is a front view of the angle adjustment device showing the first member rotated downwards. [Figure 27] This is a perspective view of the first member constituting the third embodiment of the angle adjustment device according to the present invention. [Figure 28] Figure 27 is a perspective view of the angle adjustment device showing the first member rotated upward. [Figure 29] Figure 27 is a front view of the angle adjustment device showing the first member rotated upward. [Figure 30] Figure 27 is a front view of the angle adjustment device showing the first member rotated downwards. [Figure 31] This is a perspective view showing a fourth embodiment of the angle adjustment device according to the present invention. [Figure 32] Figure 32 is an exploded perspective view. [Figure 33] Figure 32 is an exploded perspective view of the same object seen from different angles. [Figure 34] This is a front view showing the first member, as illustrated in Figure 31, in a lowered position. [Figure 35] This is a front view showing the first member shown in Figure 31 in a state where it has been pushed down. [Figure 36] This is an exploded perspective view showing a fifth embodiment of the angle adjustment device according to the present invention. [Figure 37] Figure 36 shows the exploded perspective view of the same figure as the exploded perspective view, viewed from a different angle. [Figure 38] Figure 36 is a front view of the angle adjustment device shown. [Figure 39] Figure 36 is a plan view of the angle adjustment device shown. [Figure 40] Figure 38 is a right side view of the angle adjustment device shown. [Figure 41] Figure 38 is a central vertical cross-sectional view of the angle adjustment device shown. [Modes for carrying out the invention]

[0019] A first embodiment of the angle adjustment device according to the present invention will be described with reference to the attached drawings, Figure 22 (without Figure 1). As shown in Figure 1, the angle adjustment device 10 is assembled so that the first member 20 and the second member 30 can rotate around the axis 41 of the support shaft 40.

[0020] As shown in Figures 2 and 3, the first member 20 is a press-formed product, and a substantially cylindrical connecting body 21 has a substantially disc-shaped first joining body 22 integrally attached to one end. The connecting body 21 is used to connect to other structures not shown. A pair of position-regulating pieces 23 and 24 are cut and bent between the connecting body 21 and the first joining body 22.

[0021] As shown in Figures 4 and 5, the joint surface of the first joint 22 has a number of first engaging protrusions 26 arranged in parallel along radial lines at equal angles centered on the first shaft hole 25. As shown in Figure 6, the first engaging protrusions 26 have a bottom surface that widens towards the outer edge. Furthermore, the angle B between the first engaging protrusions 26, 26 is preferably 5 to 15 degrees, and particularly preferably 9.2 to 8 degrees. This is because an angle less than 5 degrees makes machining difficult, and an angle greater than 15 degrees makes fine angle adjustment difficult. Furthermore, the height dimension of the regions of the first engaging projection 26 that interlock with each other is uniform, as shown in Figure 13.

[0022] The first engaging projection 26 is hardened to enhance wear resistance. Hardening methods include overall hardening, surface hardening, and vacuum hardening. Surface hardening methods include flame hardening, high-frequency hardening, laser hardening, electron beam hardening, as well as carburizing hardening and nitriding hardening. More specifically, for example, the first member 20 and the second member 30, which are formed from low-carbon steel by press working, are subjected to nitriding quenching. The surface hardness of the first engaging projection 26 is preferably at least 500 on the Vickers hardness scale (Hv), and more preferably 600 or higher. If the surface hardness is less than Hv500, it will wear easily and have poor durability, resulting in a shorter lifespan.

[0023] As shown in Figures 2 and 3, the second member 30 has the same shape as the first member 20. In other words, the second member 30 is a press-formed product, and a substantially disc-shaped second joint 32 is integrally attached to one end of a substantially cylindrical connecting body 31. The connecting body 31 is used to connect to other structures not shown. A pair of position-regulating pieces 33 and 34 are cut and bent between the connecting body 31 and the second joint 32.

[0024] As shown in Figure 3, the joining surface of the second joint 32 has a number of second engaging protrusions 36 arranged in parallel along radial lines at equal angles centered on the second shaft hole 35. The second engaging protrusions 36, like the first engaging protrusions 26, have a bottom surface that widens towards the outer edge and have a uniform height dimension as shown in Figure 13. The rest is the same as the first member 20 described above, so we will omit the explanation.

[0025] As shown in Figures 2 and 3, the support shaft 40 is sequentially inserted through the through holes 43 and 45 of the biasing members, the disc springs 42 and 44, the second shaft hole 35 of the second member 30, and the first shaft hole 25 of the first member 20, and then crimped and fixed. As a result, the first joint 22 of the first member 20 and the second joint 32 of the second member 30 are pressed against each other at a predetermined pressure by the spring force of the two disc springs 42 and 44 shown in Figures 8 and 9. Therefore, the first engaging projection 26 of the first joint 22 and the second engaging projection 36 of the second joint 32 are constantly meshed and engaged with each other at a predetermined pressure. The biasing member is not limited to the aforementioned disc springs 42 and 44; it may also be a coil spring or an elastic resin plate, as described later, and of course, these may be used in combination.

[0026] In particular, as shown in Figure 14, when the first engaging projection 26 and the second engaging projection 36 engage with each other, the contact angle C between the first engaging projection 26 and the second engaging projection 36 is preferably 30 to 60 degrees, and especially preferably 40 to 50 degrees. If the contact angle is less than 30 degrees, the first member 20 and the second member 30 will rotate with even a small external force, making it impossible to secure the desired holding force. If it exceeds 60 degrees, a large operating force will be required to adjust the angle, making it impractical.

[0027] The method of using the angle adjustment device according to this embodiment will be explained when it is applied to the headrest frame 52 of a floor chair, as shown in Figures 17 to 22. As shown in Figures 17 and 18, the angle adjustment device 10 according to this embodiment is assembled between the backrest frame 51 and the headrest frame 52 of the chair. Another angle adjustment device 11 is attached between the seat frame 50 and the backrest frame 51.

[0028] As shown in Figures 19 and 20, when the headrest frame 52 is pulled down against the spring force of the disc springs 42 and 44, the connecting body 21 of the first member 20 is pulled down, the first engaging projection 26 and the second engaging projection 36 engage with each other, and it can be adjusted to the desired angle. In particular, as shown in Figure 15, when the headrest frame 52 is pulled down deeply, the tip of the position regulating piece 24 of the first member 20 abuts against the tip of the position regulating piece 34 of the second member 30, thereby restricting the rotation of the first member 20.

[0029] Next, to adjust the headrest frame 52 to a new desired angle, it is pushed down in one swift motion from the pulled-down position shown in Figure 20 to the new desired angle shown in Figure 22. As a result, the first engaging projection 26 of the first member 20 overcomes the spring force of the disc springs 42 and 44, and the second engaging projection 36 of the second member 30, allowing the first member 20 to rotate to the desired angle. Consequently, the angle of the headrest frame 52 can be adjusted to the desired angle in a single rotation operation. In particular, as shown in Figure 16, when the headrest frame 52 is pushed down deeply, the tip of the position regulating piece 23 of the first member 20 abuts against the tip of the position regulating piece 33 of the second member, thereby restricting the rotation of the first member 20. It goes without saying that the angle adjustment device 10 according to the present invention may also be applied to the angle adjustment device that connects the seat frame 50 and the backrest frame 51.

[0030] According to this embodiment, when adjusting the angle between the first member 20 and the second member 30, the angle can be changed from the initial angle to the desired angle simply by rotating either the first member 20 or the second member 30 in one direction. Therefore, according to this embodiment, it is not necessary to return the first member 20 and the second member 30 to their initial positions as in the conventional example. As a result, the operation for adjusting the angle becomes simpler, and an easy-to-use angle adjustment tool 10 is obtained.

[0031] The angle adjustment device 10 according to the second embodiment is the same as that of the first embodiment described above, as shown in Figures 23 to 26, the only difference being the shape of the position regulating pieces 23 and 24. In particular, the position-restricting pieces 23 and 24 of the second embodiment have longer dimensions and shapes than the position-restricting pieces 23 and 24 of the first embodiment. Therefore, as shown in Figures 24 to 26, when the first member 20 is rotated upward or downward, the tips of the position-regulating pieces 23 and 24 of the first member abut against the tips of the position-regulating pieces 33 and 34 of the second member, respectively, thereby regulating its position. As a result, an angle adjustment device 10 with a maximum inclination angle of obtuse angle is obtained.

[0032] The angle adjustment device 10 according to the third embodiment is the same as that of the first embodiment described above, as shown in Figures 27 to 30, the only difference being the shape of the position regulating pieces 23 and 24. In particular, the position-regulating pieces 23 and 24 of the third embodiment have shorter dimensions and shapes than those of the first embodiment. Therefore, as shown in Figures 28 to 30, when the first member 20 rotates upward or downward, the tips of the position-regulating pieces 23 and 24 of the first member 20 abut against the tips of the position-regulating pieces 33 and 34 of the second member, respectively, thereby regulating its position. As a result, an angle adjustment device 10 with a maximum inclination angle close to a right angle (obtuse angle) is obtained.

[0033] It should be noted that position-restricting pieces are not necessarily required and may be provided only as needed. For example, position-restricting pieces 23 and 24 may be provided only on the outer peripheral edge of the first joint 22 of the first member 20, and position-restricting pieces may not be provided on the outer peripheral edge of the second joint 32 of the second member 30. Alternatively, one position-regulating piece may be provided on the outer peripheral edge of the first joint 22 of the first member 20 and one on the outer peripheral edge of the second joint 32 of the second member 30, so as to abut against each other. Furthermore, when a pair of position-regulating pieces that abut against each other are provided, the position-regulating pieces may have the same shape or they may have different shapes.

[0034] The angle adjustment device 10 according to the fourth embodiment is the same as that of the first embodiment described above, as shown in Figures 31 to 35, the only difference being the shape of the connecting bodies 21 and 31. In particular, the connecting bodies 21 and 31 of the fourth embodiment, as shown in Figures 32 and 33, are in the shape of a substantially rectangular plate and have multiple through holes arranged in a straight line so that they can be fastened with screws. Furthermore, as shown in Figures 34 and 35, for example, the connecting body 21 can be rotated to adjust to a desired angle in a single operation, similar to the first embodiment described above. In addition, the connecting body 21 is restricted to a predetermined position as the position restricting pieces 23 and 24 abut against the position restricting pieces 33 and 34, respectively. It should be noted that the connecting bodies 21 and 31 do not necessarily have to be made up solely of plate shapes; plate shapes and cylindrical shapes may be combined as needed. Since the rest is the same as the first embodiment described above, the same numbers are used for the same parts and their descriptions are omitted.

[0035] The angle adjustment device 10 according to the fifth embodiment is the same as that of the first embodiment described above, as shown in Figures 36 to 41, the only difference being that the biasing member is made of disc-shaped elastic resin plates 46 and 48. Specifically, as shown in Figures 36 and 37, elastic resin plates 46 and 48 are arranged on both sides of the first joint 22 and the second joint 32, respectively. By crimping and fixing the support shaft 40, which is inserted through the through holes 47 and 49 in the elastic resin plates 46 and 48 and the washer 40a, the elastic resin plates 46 and 48 are compressed and sandwiched between the support shaft 40 and the washer 40a (Figures 38 to 41). As a result, the first engaging projection 26 of the first joint 22 and the second engaging projection 36 of the second joint 32 engage with each other at a predetermined pressure. Consequently, by rotating the first member 20 and / or the second member 30, the desired angle can be adjusted in a single operation. Materials for the elastic resin plates 46 and 48 include rubber and so-called engineering plastics. Examples of engineering plastics include polyoxymethylene (POM), polyamide 66 (PA66), and ultra-high molecular weight polyethylene (UPE). Since the rest is the same as the first embodiment described above, the same numbers are used for the same parts and their descriptions are omitted. It should be noted that the biasing member does not have to be made solely of elastic resin plates; it may be constructed by appropriately combining disc springs, coil springs, and elastic resin plates. For example, it may be constructed by combining disc springs and elastic resin plates, disc springs and coil springs, or coil springs and elastic resin plates.

[0036] Having described various embodiments in detail above with reference to the drawings, various aspects of the present invention will now be described. In the following description, reference numerals will also be used as examples.

[0037] The angle adjustment device according to the first embodiment of the present invention is A first member 20 is rotatably supported by inserting a support shaft 40 through a first shaft hole 25 of a first joint body 22 provided at one end, and a first engaging projection 26 is provided on the joint surface of the first joint body 22 along radial lines at equal angles centered on the first shaft hole 25, The second member 30 has a second connecting body 32 provided at one end through which the support shaft 40 is inserted and rotatably supported, and a second engaging projection 36 is provided on the connecting surface of the second connecting body 32 along radial lines at equal angles centered on the second connecting body 35, It consists of biasing members 42 and 44 mounted on the support shaft 40 such that the first engaging projection 26 and the second engaging projection 36 are constantly engaged with each other at a predetermined pressure, The first engaging projection 26 and the second engaging projection 36 can be repeatedly disengaged and engage with each other, thereby adjusting their angle, by rotating at least one of the first member 20 and the second member 30 around the axis 41 of the support shaft 40.

[0038] The second aspect of the present invention is an angle adjustment tool described in the first aspect, wherein the engaging projection 26 has a bottom surface that widens towards the outer edge.

[0039] The third aspect of the present invention is an angle adjustment tool described in the first or second aspect, wherein the engaging projections 26 have a uniform height in the areas that interlock with each other.

[0040] The fourth aspect of the present invention is an angle adjustment tool described in any one of the first to third aspects, wherein at least the engaging projection 26 of the joint 22 is hardened.

[0041] The fifth aspect of the present invention is an angle adjustment tool described in any one of the first to fourth aspects, wherein the surface hardness of the engaging projections 26 and 36 is at least 500 on a Vickers hardness Hv.

[0042] The sixth aspect of the present invention is an angle adjustment device described in any one of the first to fifth aspects, wherein the biasing member is composed of at least one disc spring 42.

[0043] The seventh aspect of the present invention is an angle adjustment device described in any one of the first to sixth aspects, wherein the biasing member is composed of at least one coil spring.

[0044] The eighth aspect of the present invention is an angle adjustment device described in any one of the first to seventh aspects, wherein the biasing member is composed of at least one elastic resin plate 46.

[0045] The angle adjustment device according to the ninth aspect of the present invention is configured such that, in the angle adjustment device described in any one of the first to eighth aspects, at least one position regulating piece 23 is provided on at least one of the outer peripheral edges of the first joint 22 of the first member 20 and the second joint 32 of the second member 30.

[0046] The angle adjustment device according to the tenth embodiment of the present invention is configured such that, in the angle adjustment device described in any one embodiment of the first to ninth embodiments, position regulating pieces 23, 24 and 33, 34 that can abut against each other are provided on the outer peripheral edge of the first joint 22 of the first member 20 and on the outer peripheral edge of the second joint 32 of the second member 30, respectively.

[0047] The 11th aspect of the present invention is an angle adjustment device described in any one of the first to tenth aspects, wherein the position regulating pieces 23 and 24 provided on the outer peripheral edge of the first joint 22 of the first member 20 and the position regulating pieces 33 and 34 provided on the outer peripheral edge of the second joint 32 of the second member 30 have different shapes and are configured to abut each other.

[0048] The furniture according to the twelfth embodiment of the present invention is configured such that the angle adjustment device described in the above embodiment is attached to a rotating member. [Industrial applicability]

[0049] The angle adjustment device according to the present invention is not limited to the headrest of a floor chair, but can also be applied to other interior furniture such as sofa headrests, armrests, and footrests, as well as office furniture such as office chairs, and, for example, door hinges, cupboard door flap fittings, and angle adjustment devices for monitors or touch panels. [Explanation of Symbols]

[0050] 10 Angle adjuster 11 Angle adjuster 20 First Member 21 Concatenation 22 First zygote 23 Position regulation piece 24 Position regulation piece 25 First shaft hole 26 1st engagement convex part 30 Second Member 31 Concatenation 32 Second zygote 33 Position regulation piece 34 Position regulation piece 35 Second shaft hole 36 Second engagement protrusion 40 Spindle 41 Axis center 42 Disc springs 43 Through hole 44 Disc springs 45 Through hole 46 Elastic resin plate 47 Through hole 48 Elastic resin plate 49 Through hole 50 Seat frame 51 Rear frame 52 Headrest Frame

Claims

1. A first member is rotatably supported by inserting a support shaft through a first shaft hole provided at one end of the first joint, and a first engaging projection is provided on the joint surface of the first joint along radial lines at equal angles centered on the first shaft hole, A second member is provided with a second shaft hole at one end of the second joint, through which the support shaft is inserted and rotatably supported, and a second engaging projection is provided on the joint surface of the second joint, along radial lines at equal angles centered on the second shaft hole. It consists of a biasing member mounted on the support shaft such that the first engaging projection and the second engaging projection are constantly engaged with each other at a predetermined pressure, An angle adjustment device characterized in that the first engaging projection and the second engaging projection can be repeatedly disengaged and engaged with each other, thereby adjusting the angle, by rotating at least one of the first member and the second member around the axis of the support shaft.

2. The angle adjustment device according to claim 1, characterized in that the engaging projection has a bottom surface that widens towards the outer edge.

3. The angle adjustment tool according to claim 1, characterized in that the regions of the engaging protrusions that interlock with each other have a uniform height.

4. The angle adjustment tool according to claim 1, characterized in that at least the engaging projection of the joint is hardened.

5. The angle adjustment tool according to claim 4, characterized in that the surface hardness of the engaging projection is at least 500 on a Vickers hardness Hv.

6. The angle adjustment device according to claim 1, characterized in that the biasing member is at least one disc spring.

7. The angle adjustment device according to claim 1, characterized in that the biasing member is at least one coil spring.

8. The angle adjustment device according to claim 1, characterized in that the biasing member is at least one elastic resin plate.

9. The angle adjustment device according to claim 1, characterized in that at least one position regulating piece is provided on the outer peripheral edge of at least one of the outer peripheral edges of the first joint of the first member and the second joint of the second member.

10. The angle adjustment device according to claim 1, characterized in that a position regulating piece that can abut against each other is provided on the outer peripheral edge of the first joint of the first member and on the outer peripheral edge of the second joint of the second member.

11. The angle adjustment device according to claim 1, characterized in that the position regulating piece provided on the outer peripheral edge of the first joint of the first member and the position regulating piece provided on the outer peripheral edge of the second joint of the second member have different shapes and can abut against each other.

12. Furniture characterized by having an angle adjustment device according to any one of claims 1 to 11 attached to a rotating member.

Images