CN107510280B

CN107510280B - Angle adjusting fitting

Info

Publication number: CN107510280B
Application number: CN201710821750.9A
Authority: CN
Inventors: 永谷洋一
Original assignee: Dongguan Koyo Metal Products Co ltd
Current assignee: Dongguan Koyo Metal Products Co ltd
Priority date: 2017-05-11
Filing date: 2017-09-13
Publication date: 2023-10-13
Anticipated expiration: 2037-09-13
Also published as: JP2018187286A; EP3400836B1; CN208807931U; EP3400836A1; CN107510280A; JP6404400B1

Abstract

The invention provides an angle adjusting fitting which is easy to design and manufacture and has stable action characteristics. The angle adjustment fitting comprises a 1 st arm (10), a 2 nd arm (20) and a floating wedge member (40), wherein the 1 st arm (10) is provided with a wedge-shaped window (18) having a linear wedge surface (18 a); the 2 nd arm (20) is supported swingably about an axial center with respect to the 1 st arm (10), and is provided with a circular arc-shaped gear portion (26); the floating wedge member (40) has a linear 1 st contact surface (41) that contacts a linear wedge surface (18 a) located outside the wedge window (18) on one surface side, has a tooth surface (43) that engages with the gear (26) on the other surface side, is movably accommodated in a wedge space in the wedge window (18) that is not covered with the gear (26), slides along the linear wedge surface (18 a) by the linear contact surface (41), and engages with the gear (26), and the floating wedge member (40) restricts the 2 nd arm (20) from swinging in the deployment direction relative to the 1 st arm (10).

Description

Angle adjusting fitting

Technical Field

The present invention relates to angle adjusting fittings, and more particularly, to angle adjusting fittings used in furniture such as sofas.

Background

Conventionally, an angle adjustment fitting is widely used to adjust a headrest, an armrest, a leg rest (foot-rest) or the like of a sofa to a desired angle (see patent document 1).

For example, there is an angle adjustment fitting having a 1 st arm 1, a 2 nd arm 2, a wedge-shaped window portion 5, and a floating wedge member 6, wherein the 1 st arm 1 has a box portion 3; the 2 nd arm 2 isThe box body 3 and the 1 st arm 1 can be wound around the 1 st axis C ₁ A swinging type pivot connection and a gear part 4; the wedge-shaped window 5 is formed in the case 3 of the 1 st arm 1; the floating wedge member 6 is movably disposed in the wedge-shaped window portion 5, and has a tooth surface 7 that engages with the gear portion 4.

In particular, in the angle adjustment fitting, it is disclosed that the floating wedge member 6 is disposed in a wedge space formed by the arc-shaped wedge surface 8 provided in the wedge window 5 and the arc-shaped gear portion 4.

Patent literature

Patent document 1: japanese patent laid-open publication No. 2005-76735

Disclosure of Invention

However, in the angle adjustment fitting, the gear portion 4 is formed with the 1 st axis C ₁ Is in the shape of a circular arc in the center. On the other hand, the wedge surface 8 is formed to be coaxial with the 1 st axis C ₁ Eccentric 2 nd axis C ₂ Is in the shape of a circular arc in the center. Further, the contact surface 9 of the floating wedge member 6, which contacts the contact surface of the wedge surface 8, is also formed in an arc shape. Therefore, many design factors such as the curvature and the eccentricity of each arc shape should be considered in designing, and it is not easy to design. Especially in the case of designing the angle adjustment fitting according to the customer's request, the design is time-consuming.

In order to smooth and stabilize the motion of the floating wedge member 6 that performs a complicated motion, the member size, for example, the curvature or the eccentricity of each circular arc shape must have high dimensional accuracy. Therefore, in the angle adjustment fitting in the conventional example, there is a problem that it takes a long time to manufacture the component in order to secure stable operation characteristics.

In view of the above, an object of the present invention is to provide an angle adjustment fitting which is easy to design and manufacture and has more stable operation characteristics.

In order to solve the above problems, the angle adjustment fitting according to the present invention has the following structure:

it has the following components:

arm 1, the above-mentioned arm 1 has wedge window part with wedge surface of the straight line;

a 2 nd arm supported swingably about an axis with respect to the 1 st arm, the 2 nd arm being provided with a circular arc-shaped gear portion; and

A floating wedge member having a linear contact surface on one surface side, the contact surface being in contact with a linear wedge surface located outside the wedge-shaped window portion,

a tooth surface is provided on the other surface side, the tooth surface is engaged with the gear portion,

the floating wedge member is movably accommodated in a wedge space of the wedge window portion which is not covered by the gear portion,

the floating wedge member restricts the arm 2 from swinging in the deployment direction relative to the arm 1 by sliding the linear abutment surface along the linear wedge surface and meshing the tooth surface with the gear portion.

According to the present invention, the linear abutment surface of the floating wedge member slides along the linear wedge surface. Therefore, the wedge surface of the wedge-shaped window portion provided in the 1 st arm can be designed and manufactured with reference to a straight line. As a result, it is not necessary to design and manufacture a circular arc-shaped wedge surface eccentric from a circular arc-shaped gear portion as in the conventional example, and thus design and manufacture are easy.

Further, the linear abutment surface of the floating wedge member slides along the linear wedge surface of the wedge window. Therefore, the operation of the floating wedge member is simplified, and an angle adjustment fitting having smoother and stable operation characteristics can be obtained.

In an embodiment of the present invention, a linear guide surface parallel to the wedge surface may be formed at a position facing the wedge surface of the wedge window.

According to this embodiment, the floating wedge member can slide along two parallel wedge surfaces and the guide surface. Therefore, the operation characteristics of the floating wedge member are more stable.

In another embodiment of the present invention, an abutment surface parallel to the abutment surface may be formed on an edge portion of the tooth surface of the floating wedge member.

According to this embodiment, the floating wedge member is slidable within the wedge window portion by the two parallel abutment surfaces of the floating wedge member. Thus, the operation characteristics of the floating wedge member are further improved.

In another embodiment of the present invention, the floating wedge member may have a pair of straight contact surfaces formed in a mirror shape.

According to the present embodiment, since there is no directivity at the time of assembling the floating wedge member, no assembly error occurs, and thus the assembly workability is improved.

As a different embodiment of the present invention, an arc surface may be formed between a pair of straight contact surfaces.

According to the present embodiment, the movement of the floating wedge member becomes smoother.

As another embodiment of the present invention, a non-contact free holding mechanism may be provided, which holds the tooth surface of the floating wedge member and the gear portion of the 2 nd arm free in a non-contact manner when the 2 nd arm is swung.

According to the present embodiment, when the 2 nd arm is swung, the tooth surface of the floating wedge member and the gear portion of the 2 nd arm do not collide. Therefore, the angle adjustment fitting that does not generate an offensive click sound can be obtained.

As another embodiment of the present invention, the present invention may be configured as follows: the non-contact free holding mechanism has a wedge operation plate which rotates in a small angle range by its drag rotation friction with the 2 nd arm,

the wedge operation plate releases the tooth surface of the floating wedge member from the gear portion in a noncontact manner by swinging the 2 nd arm in one direction relative to the 1 st arm to form a noncontact release state,

further, by the small-angle swing in the other direction, the floating wedge member is pressed between the linear wedge surface formed on the 1 st arm side and the gear portion, and the tooth surface of the floating wedge member is brought into engagement with the gear portion, whereby the relative swing of the 2 nd arm with respect to the 1 st arm in the other direction is restricted by the wedge action of the floating wedge member.

According to the present embodiment, when the 2 nd arm is swung, the tooth surface of the floating wedge member is released from the gear portion in a non-contact manner, and a non-contact released state is formed. Therefore, the generation of the rattling and clicking sound generated when the 2 nd arm is swung can be prevented.

As another embodiment of the present invention, an urging spring may be provided, the urging spring being attached to the 1 st arm, and urging the floating wedge member toward the axial center side causes a collision sound to be generated when the tooth surface of the floating wedge member is engaged with the gear portion to form a locked state.

According to the present embodiment, by providing the wedge actuation plate, no click sound is generated during the swinging of the 2 nd arm.

Further, only when the tooth surface of the floating wedge member is engaged with the gear portion to form a locked state, the floating wedge member biased by the spring force of the biasing spring is caused to generate a collision sound. Therefore, the user can recognize that the 2 nd arm is in the locked state by the crash sound, and thus can learn the operation condition, and thus can obtain a feeling of ease.

As a new embodiment of the present invention, a reverse rotation suppressing spring may be provided, in which one end portion is engaged with a support shaft disposed at the axial center and the other end portion is engaged with the 2 nd arm, and the swing of the 2 nd arm in the raising direction is suppressed by the spring force of the spiral spring material.

According to this embodiment, for example, when a user sits on a sofa incorporating the angle adjustment fitting of the present application, tension acts on the skin of the sofa, and the 2 nd arm of the angle adjustment fitting may be pulled in the standing direction. In such a case, the spring force of the reverse suppressing spring suppresses the swing of the 2 nd arm. Therefore, the 2 nd arm does not swing in the standing direction against the intention of the user, and a desired tilting angle can be maintained.

The furniture according to the present application is configured to incorporate the angle adjusting fitting in order to solve the above-described problems.

According to the furniture, the furniture has the following effects: it is possible to obtain furniture in which the design and manufacture of the structural member are easy, and the motion characteristics of the swinging structural member are smooth and stable.

Drawings

Fig. 1 is a perspective view showing a first embodiment of an angle adjustment fitting according to the present application.

Fig. 2 is a perspective view of the angle adjustment fitting shown in fig. 1 from a different angle.

Fig. 3 is an exploded perspective view of the angle adjustment fitting shown in fig. 1.

Fig. 4 is an exploded perspective view of the angle adjustment fitting shown in fig. 2.

Fig. 5 is a front view of the opposing wall portions shown in fig. 3 as structural members.

Fig. 6 is a perspective view of the wedge actuation plate shown in fig. 3.

Fig. 7 is a perspective view of the floating wedge member shown in fig. 1.

Fig. 8 is a perspective view of the floating wedge member shown in fig. 7 from a different angle.

Fig. 9 is a partially enlarged perspective view showing a state in which the 1 st and 2 nd shell portions are taken out from the perspective view of fig. 1.

Fig. 10 is a partially enlarged perspective view showing a state in which the opposing wall portion on the near side is taken out from fig. 9.

Fig. 11 is a partially enlarged perspective view showing a state in which the gear plate portion on the near side is taken out from fig. 10.

Fig. 12 is a partially enlarged perspective view showing a state in which the wedge operating plate is taken out from fig. 11.

Fig. 13 is a partially enlarged perspective view showing a state in which the floating wedge member is taken out from fig. 12.

Fig. 14 is a partially enlarged front view showing a locked state of the 2 nd arm achieved by the wedge effect of the floating wedge member in fig. 12.

Fig. 15 is an operation process diagram showing an operation procedure of the angle adjustment fitting according to the first embodiment.

Fig. 16 is a process diagram illustrating operations subsequent to fig. 15.

Fig. 17 is a process diagram illustrating operations subsequent to fig. 16.

Fig. 18 is a process diagram illustrating operations subsequent to fig. 17.

Fig. 19 is a process diagram illustrating operations subsequent to fig. 18.

Fig. 20 is a process diagram illustrating operations subsequent to fig. 19.

Fig. 21 is a perspective view showing a second embodiment of the angle adjustment fitting according to the present invention.

Fig. 22 is a perspective view of the angle adjustment fitting shown in fig. 21 from a different angle.

Fig. 23 is an exploded perspective view of the angle adjustment fitting shown in fig. 21.

Fig. 24 is an exploded perspective view of the angle adjustment fitting shown in fig. 22.

Fig. 25 is a front view of the opposing wall portions of the structural member shown in fig. 23.

Fig. 26 is a front view of the wedge actuation plate shown in fig. 23.

Fig. 27 is a partially enlarged perspective view showing a state in which the 1 st and 2 nd shell portions are taken out from the perspective view of fig. 21.

Fig. 28 is a partially enlarged perspective view showing a state in which the opposing wall portion on the near side is taken out from fig. 27.

Fig. 29 is a partially enlarged perspective view showing a state in which the gear plate portion on the near side is taken out from fig. 28.

Fig. 30 is a partially enlarged perspective view showing a state in which the wedge operating plate and the biasing spring are taken out from fig. 29.

Fig. 31 is a partially enlarged perspective view showing a state in which the floating wedge member is taken out from fig. 30.

Fig. 32 is an operation process diagram showing an operation procedure of the angle adjustment fitting according to the second embodiment.

Fig. 33 is a process diagram illustrating operations subsequent to fig. 32.

Fig. 34 is a process diagram illustrating operations subsequent to fig. 33.

Fig. 35 is a process diagram illustrating operations subsequent to fig. 34.

Fig. 36 is a process diagram illustrating operations subsequent to fig. 35.

Fig. 37 is a process diagram illustrating operations subsequent to fig. 36.

Fig. 38 is a perspective view showing a third embodiment of the angle adjustment fitting according to the present invention.

Fig. 39 is a perspective view of the angle adjustment fitting shown in fig. 38 from a different angle.

Fig. 40 is an exploded perspective view of the angle adjustment fitting shown in fig. 38.

Fig. 41 is an exploded perspective view of the angle adjustment fitting shown in fig. 39.

Fig. 42 is a partially enlarged perspective view showing a state in which the 1 st and 2 nd shell portions are taken out from fig. 38.

Fig. 43 is a partially enlarged perspective view showing a state in which the opposing wall portion on the near side is taken out from fig. 42.

Fig. 44 is a partially enlarged perspective view showing a state in which the gear plate portion on the near side is taken out from fig. 43.

Fig. 45 is a partially enlarged perspective view showing a state in which the wedge operating plate is taken out from fig. 44.

Fig. 46 is an operation process diagram showing an operation procedure of the angle adjustment fitting according to the third embodiment.

Fig. 47 is a process diagram illustrating operations subsequent to fig. 46.

Fig. 48 is a process diagram illustrating the operation of fig. 47.

Fig. 49 is a process diagram illustrating operations subsequent to fig. 48.

Fig. 50 is a process diagram illustrating operations subsequent to fig. 49.

Fig. 51 is a process diagram illustrating operations subsequent to fig. 50.

Detailed Description

An embodiment of the angle adjustment fitting according to the present invention will be described with reference to fig. 1 to 51.

The angle adjustment fitting according to the first embodiment is illustrated in fig. 1 to 20. In particular, as shown in fig. 3 and 4, the angle adjustment fitting according to the first embodiment includes the 1 st arm 10, the 2 nd arm 20, the noncontact free-holding mechanism 30, the floating wedge member 40, and the 1 st and 2 nd housing portions 50 and 52. The 1 st arm 10 and the 2 nd arm 20 are integrated by a support shaft 56 so as to be swingable about the axial center L.

As shown in fig. 3 and 4, the 1 st arm 10 includes a mounting portion 11 and a pair of opposing wall portions 12 and 13 that sandwich one end portion of the mounting portion 11 and are opposed in parallel. The opposing wall portions 12, 13 are fixed to one end portion of the mounting portion 11 by riveting with 2 rivets 14, 14.

The fixing method is not limited to the above-described caulking fixing, and may be performed by, for example, bolts and nuts or welding. Further, the fitting projection may be provided on one of the mounting portion 11 and the opposing wall portions 12, 13 by an extrusion (injection) process, and the other may be provided with a fitting hole for integration.

The opposite wall portions 12, 13 are formed to be mirror-symmetrical. For example, as shown in fig. 5, one side of the opposing wall portion 13 is provided with a shaft hole 15, and the inward surface of the other side thereof is provided with a stopper pin 17 protruding. A wedge-shaped window 18 is provided between the shaft hole 15 and the stopper pin 17 in the opposing wall 13.

The stopper pin 17 may be formed by extrusion or by attaching a separate metal pin.

The position of the stopper pin 17 may be changed as necessary to be engageable with a leaf spring piece 36 described later.

As shown in fig. 3 and 4, the stopper pins 17 and 17 are provided on the pair of opposing wall portions 12 and 13 so as to be coaxial with each other. The plate spring piece 36 of the wedge plate 31 described later is engaged with the stopper pin 17, whereby the wedge plate 31 can be positioned at a predetermined position. Further, by bringing the plate spring piece 36 of the wedge plate 31 described later into contact with the stopper pin 17 or having a minute gap, it is possible to prevent the wedge plate 31 from being greatly loosened.

As shown in fig. 5, the wedge-shaped window 18 has a linear wedge surface 18a. The wedge surface 18a is inclined so as to gradually approach a gear portion 26 of the 2 nd arm 20 (fig. 12 to 14). The wedge-shaped window 18 has an opposing guide surface 18b parallel to the wedge surface 18a. The wedge surface 18a and the guide surface 18b have a guide function for sliding the floating wedge member 40. Further, the wedge surface 18a and the guide surface 18b are connected by an inclined surface 18 c. The wedge surface 18a and the inclined surface 18c have substantially the same inclination angle as the 1 st contact surface 41 and the 2 nd contact surface 42 of the floating wedge member 40, which will be described later. When the floating wedge member 40 is separated from the gear portion 26, the wedge surface 18a, the guide surface 18b, and the inclined surface 18c form a storage space in which the floating wedge member 40 can be stored (fig. 12). The wedge surface 18a and the guide surface 18b are connected via an arc surface 18d formed concentrically with the shaft hole 15. Accordingly, as shown in fig. 12 to 14, a wedge-shaped space is formed by the linear wedge surface 18a and the arcuate gear portion 26, which is narrowed in the clockwise rotation direction. The floating wedge member 40 is movably fitted in the wedge space.

Since the opposing wall portions 12 and 13 are formed to be mirror-symmetrical, the same reference numerals are given to the same portions, and the description thereof is omitted.

As shown in fig. 3 and 4, the 2 nd arm 20 includes a mounting portion 21 and a pair of gear plate portions 22 and 23 opposed in parallel to each other with one end portion of the mounting portion 21 interposed therebetween. The gear plate portions 22 and 23 are fixed to the mounting portion 21 by caulking with 2 rivets 24 and 24.

The fixing method is not limited to the above-described caulking fixing, and may be performed by, for example, bolts and nuts or welding. Further, a fitting projection may be provided on one of the mounting portion 21 and the opposing wall portions 22, 23 by an extrusion (injection) process, and a fitting hole may be provided on the other of the mounting portion and the opposing wall portions to be integrated.

The gear plate portions 22 and 23 are formed in mirror symmetry, and have shaft holes 25 and 25, respectively, for passing through the support shaft 56. Further, in the gear plate portions 22, 23, the gear portions 26, 26 are formed at the arcuate outer edge portions on one end side thereof, for example, in the range of 100 ° to 120 ° in center angle. Further, a 1 st boss 27 is provided at a start end portion of the gear portion 26. Further, a 2 nd boss 28 is provided at a distal end portion of the gear portion 26. The gear plate portions 22, 23 are provided with locking pins 29, 29 protruding from inner surfaces thereof, respectively.

The two gear plate portions 22 and 23 of the 2 nd arm 20 are fitted between the opposing wall portions 12 and 13 of the 1 st arm 10, and are swingably coupled with each other via a support shaft 56.

In the present embodiment, the 1 st arm 10 and the 2 nd arm 20 are formed by combining 3 pieces of structural members, but the present invention is not limited thereto. For example, the 1 st arm 10 and the 2 nd arm 20 may be formed by overlapping and integrating 2 pieces of structural members formed to be mirror-symmetrical. As an integrating method, for example, welding, caulking, a bolt and a nut, fitting projections, or the like may be used.

As shown in fig. 3 and 4, the noncontact free holding mechanism 30 includes a wedge actuation plate 31, and the wedge actuation plate 31 rotates within a predetermined angle around the axial center L due to a drag rotation friction force with the 2 nd arm 20.

As shown in fig. 6, the wedge plate 31 is formed by punching and folding 1 sheet of metal plate by press working. The wedge plate 31 has a shaft hole 32 provided on one side thereof, a pair of plate springs 36 and 36 provided on the other side thereof, and an opening 37 provided between the shaft hole 32 and the plate springs 36 and 36. The wedge plate 31 is supported so as to be swingable together with the 2 nd arm 20 in a state of being fitted between the gear plate portions 22, 23. The locking claw 35 is formed at a corner portion located near the shaft hole 32. The locking claw 35 limits the wedge operation plate 31 by the locking pin 29 locked to the gear plate portions 22 and 23. In the relationship with the stopper pin 17, the plate spring piece 36 may be provided below or above the wedge plate 31.

The shaft hole 32 has a diameter of an annular rib 25a that can be fitted into an opening edge portion of the shaft hole 25 (fig. 3 and 4) provided in the gear plate portions 22 and 23. The shaft hole 32 is formed with an annular sliding contact portion 33 at a peripheral portion thereof. The annular sliding contact portion 33 is connected to the wedge plate 31 via a wave spring portion 34. The annular sliding contact portion 33 and the wave spring portion 34 are formed by forming a plurality of discontinuous arcuate slits in concentric circles around the shaft hole 32, and then projecting the annular sliding contact portion 33 in the plate thickness direction, thereby simultaneously forming the annular sliding contact portion 33 and the wave spring portion 34.

Further, since the wave spring portion 34 is elastically deformed, the annular sliding contact portion 33 is elastically pressed against the inward surfaces of the gear plate portions 22 and 23 of the 2 nd arm 20. Accordingly, a moderate drag rotational friction force is generated between the wedge actuation plate 31 and the 2 nd arm 20. Accordingly, the wedge actuation plate 31 and the 2 nd arm 20 are rotated together due to the drag rotation friction force described above.

By providing the annular sliding contact portion 33, the wave spring portion 34 is reinforced, and the durability is improved, and the swinging motion is smoothed and stabilized.

In the wedge plate 31, only the wave spring portion 34 may be provided around the shaft hole 32.

As shown in fig. 6, the leaf spring pieces 36, 36 are formed by providing slits long in the longitudinal direction along the other side edge portion of the wedge operation plate 31, and bending the other side edge portions left after cutting at substantially right angles. Therefore, both ends in the longitudinal direction of the plate reed 36 are integrally connected to the wedge operation plate 31.

The leaf spring piece 36 has a convex portion 36a protruding outward in the middle in the longitudinal direction. The leaf spring piece 36 has a locking recess 36b formed in a base portion on one side of the projection 36a. By engaging the stopper pin 17 with the engaging recess 36b, the wedge operating plate 31 is restricted so as not to rotate due to the drag rotation friction with the 2 nd arm 20 (fig. 10 and 11). The leaf spring piece 36 is formed with a guide concave portion 36c on the other side of the convex portion 36a. When the stopper pin 17 is positioned and guided in the guide recess 36c, the wedge operating plate 31 and the 2 nd arm 20 rotate together due to the drag rotation friction force.

The stopper pin 17 may be in contact with the guide recess 36c or may have a minute gap.

The plate spring piece 36 does not have to be provided in a pair, and 1 piece may be provided on one side.

As shown in fig. 6, the opening window 37 has a shape that allows the floating wedge member 40 to be moved to a predetermined position and to be held without rattling.

That is, the opening window 37 has a 1 st support 37a and a 2 nd support 37b which are vertically opposed to each other. The 1 st support portion 37a and the 2 nd support portion 37b are opposed to each other by a distance that can be supported by being in contact with an upper end edge portion and a lower end edge portion of the floating wedge member 40 (fig. 10 and 11), respectively. The 1 st support portion 37a and the 2 nd support portion 37b are connected to each other by the 1 st connecting portion 37c and the 2 nd connecting portion 37 d. The 1 st connecting portion 37c has an arc surface of concentric circles forming the shaft hole 32. The 2 nd connecting portion 37d is formed as a curved surface that does not abut against the floating wedge member 40.

As shown in fig. 7 and 8, the floating wedge member 40 is formed to be mirror symmetrical. Therefore, the assembling direction of the floating wedge member 40 is not limited to one direction, and thus the assembling work becomes easy.

That is, the floating wedge member 40 has the 1 st abutment surface 41 and the 2 nd abutment surface 42 on one side thereof, and the tooth surface 43 is formed on the other side thereof. The 1 st contact surface 41 and the 2 nd contact surface 42 are flat surfaces. The angle between the 1 st contact surface 41 and the 2 nd contact surface 42 is substantially the same as the angle between the wedge surface 18a and the inclined surface 18c provided in the opposing wall portions 12, 13 (fig. 9, 12).

Further, the 3 rd abutment surface 44 and the 4 th abutment surface 45, which are parallel to the 1 st abutment surface 41 and the 2 nd abutment surface 42, are provided at the upper and lower edge portions of the tooth surface 43, respectively. The 3 rd contact surface 44 and the 4 th contact surface 45 are flat surfaces.

Further, arcuate surfaces 46 and 47 having the same curvature are formed between the 1 st contact surface 41 and the 2 nd contact surface 42. Further, an arcuate surface 48 having a curvature different from that of the arcuate surfaces 46, 47 is provided between the arcuate surfaces 46, 47. By providing the circular arc surfaces 46, 47, 48, the movement of the floating wedge member 40 can be smoother.

As shown in fig. 8, a plurality of teeth are formed on the tooth surface 43 of the floating wedge member 40. The tooth surface 43 and the gear portions 26, 26 are engaged at 2 in the left-right width direction, and all the teeth of the tooth surface 43 are simultaneously engaged with the gear portions 26, 26 (fig. 14).

For example, 13 to 20 teeth may be formed on the tooth surface 43 of the floating wedge member 40, and 40 or more teeth, more preferably 45 to 65 teeth, may be formed on the gear portion 26. Thus, the number of angle adjustment stages can be set to 40 or more.

The 1 st and 2 nd shell portions 50 and 52 are members for preventing the floating wedge member 40 from falling off. Accordingly, the 1 st and 2 nd shell portions 50 and 52 have front shapes covering the outer peripheral surfaces of the opposite wall portions 12 and 13 of the 1 st arm 10, respectively, and also have shaft holes 51 and 53, respectively. The 1 st and 2 nd shell portions 50 and 52 are integrally connected to each other by a pair of elastic claw portions 54 and 54 provided in the 2 nd shell portion 52.

Next, a method for assembling the structural members according to the first embodiment will be described.

First, the wedge operation plate 31 is fitted between the gear plate portions 22 and 23 of the 2 nd arm 20 in advance, and is fixed by caulking by the rivet 24, thereby integrating the 2 nd arm 20. Then, the gear plate portions 22 and 23 and the wedge plate 31 are inserted between the opposing wall portions 12 and 13 of the integrated 1 st arm 10 to be positioned. Further, after the 2 nd shell portion 52 is positioned on the opposite wall portion 13, the support shaft 56 is passed through the shaft holes 53, 15, 25, 32, 25, 15 and temporarily fixed. Then, the floating wedge member 40 is inserted from the wedge-shaped window portion 18 of the opposing wall portion 12, and is inserted into the opening window portion 37 and the wedge-shaped window portion 18 of the opposing wall portion 13. Then, the shaft hole 51 of the 1 st housing portion 50 is fitted to the support shaft 56, thereby preventing the floating wedge member 40 from coming off. Finally, the gasket 55 is fitted to the support shaft 56, and one end portion of the protruding support shaft 56 is swaged, whereby the above-described structural members are coupled and integrated.

Next, a method of using the angle adjustment fitting according to the first embodiment will be described.

First, as shown in fig. 15, if the 2 nd arm 20 is tilted in the arrow a direction with respect to the 1 st arm 10, the tooth surface 43 of the floating wedge member 40 is brought into engagement with the gear portion 26. The floating wedge member 40 is pressed into a wedge-shaped space formed between the linear wedge surface 18a and the gear portion 26 and gradually narrowed in the clockwise rotation direction. Therefore, the floating wedge member 40 restricts the swing of the 2 nd arm 20 in the a direction by the wedge action, thereby maintaining (fixedly holding) the inclination angle of the 1 st arm 10 and the 2 nd arm 20.

That is, if in the engaged state shown in fig. 15, the tooth surface 43 of the floating wedge member 40 is engaged with the gear portion 26, the inclination angle of the 1 st arm 10 and the 2 nd arm 20 can be reliably maintained without sliding of the 2 nd arm 20.

Conversely, as shown in fig. 16, if the 2 nd arm 20 is swung in the arrow B direction, the wedge actuation plate 31 will start to co-rotate with the 2 nd arm 20 due to drag rotation (drag rotation) friction force generated based on the spring force of the wave spring portion 34. Accordingly, the tooth surface 43 of the floating wedge member 40 and the gear portion 26 start to separate. At the same time, the 1 st support portion 37a of the wedge actuation plate 31 pushes down the upper end surface of the floating wedge member 40. Accordingly, the floating wedge member 40 slides obliquely downward along the linear wedge surface 18a and the guide surface 18b, and moves downward of the wedge window 18. Therefore, a minute gap will be generated between the tooth surface 43 and the gear portion 26, and the floating wedge member 40 forms a non-contact free state. In the non-contact free state, the floating wedge member 40 is supported at 4 of the wedge surface 18a, the guide surface 18b of the wedge window 18 and the 1 st and 2 nd support portions 37a and 37b of the wedge operation plate 31. In the non-contact free state, the floating wedge member 40 does not contact the gear portion 26, and therefore the 2 nd arm 20 can be swung in the arrow B direction without generating an offensive click sound. Further, during the generation of the drag rotational friction force between the wedge actuation plate 31 and the 2 nd arm 20, since the floating wedge member 40 is pushed from above by the wedge actuation plate 31, the tooth surface 43 and the gear portion 26 do not mesh with each other.

That is, during the operation of swinging the 2 nd arm 20 in the arrow B direction, the floating wedge member 40 is not loosened and held, so that the non-contact state of the tooth surface 43 of the floating wedge member 40 and the gear portion 26 is maintained.

Further, as shown in fig. 17, if the 2 nd arm 20 is swung in the arrow B direction, the 2 nd protrusion 28 presses the upper end surface of the floating wedge member 40. Accordingly, the lower end portion of the floating wedge member 40 pushes the 2 nd supporting portion 37b of the wedge operating plate 31 downward. Therefore, by the common rotation of the wedge operating plate 31, the stopper pin 17 gets over the convex portion 36a of the plate spring 36 and is locked to the locking concave portion 36b. Then, the 2 nd contact surface 42 of the floating wedge member 40 contacts the inclined surface 18c, and a storage state is formed (fig. 18).

In the storage state, the floating wedge member 40 is stored in the storage space, and the locking recess 36b of the leaf spring piece 36 is locked to the stopper pin 17. Therefore, even if the 2 nd arm 20 is swung in the a direction, the gear portion 26 is kept in a non-contact free state not engaged with the tooth surface 43 by the spring force of the plate spring piece 36 engaged with the stopper pin 17. Therefore, the wedge operating plate 31 does not perform a common rotation and only the 2 nd arm 20 can freely swing in the a direction (fig. 19).

Next, as shown in fig. 19, if the 2 nd arm 20 is swung in the arrow a direction, immediately before the 2 nd arm 20 reaches the final extended position formed linearly with respect to the 1 st arm 10, the locking pin 29 of the gear plate portion 23 is locked to the locking claw portion 35 of the wedge operation plate 31. Further, if the 2 nd arm 20 is swung slightly with force in the arrow a direction, the wedge operating plate 31 is also swung in the clockwise rotation direction (a direction) around the support shaft 56. Therefore, the stopper pin 17 is disengaged from the locking recess 36b of the leaf spring piece 36, and the stopper pin 17 is positioned in the guiding recess 36c of the leaf spring piece 36 (fig. 20). Accordingly, the 2 nd support portion 37b of the wedge operating plate 31 pushes up the lower end surface of the floating wedge member 40, and the floating wedge member 40 in the stored state is moved upward. At this time, the upper end surface of the floating wedge member 40 also abuts against the 1 st support portion 37a of the wedge operating plate 31, so that the floating wedge member 40 does not come loose. Further, the wedge actuation plate 31 will co-rotate due to drag rotational friction generated between the wedge actuation plate 31 and the 2 nd arm 20. Therefore, the floating wedge member 40 slides along the linear wedge surface 18a and the guide surface 18b toward the upper portion of the wedge window 18 (wedge space), and the tooth surface 43 of the floating wedge member 40 is brought into engagement with the gear portion 26.

In the present embodiment, the position where the 2 nd arm 20 is formed in a straight line (180 degrees) with respect to the 1 st arm 10 is the final extended position, but the present invention is not limited thereto. By appropriately selecting the range in which the center angle of the gear portion 26 is provided, for example, the position in which the 2 nd arm 20 forms an angle of 120 degrees with respect to the 1 st arm 10 may be set as the final deployed position.

Then, if the 2 nd arm 20 is swung again in the arrow B direction, the wedge operation plate 31 starts to rotate together with the 2 nd arm 20 due to the drag rotation friction force generated by the spring force of the wave spring portion 34. The 1 st support 37a of the wedge actuation plate 31 pushes down the upper end surface of the floating wedge member 40. Accordingly, the floating wedge member 40 slides along the wedge surface 18a and the guide surface 18b of the wedge window 18 and moves slightly in a direction away from the gear portion 26. Therefore, a minute gap is generated between the tooth surface 43 and the gear portion 26, and the floating wedge member 40 is again brought into a non-contact free state (fig. 16). Therefore, even if the 2 nd arm 20 is swung in the arrow B direction, no click sound is generated. Then, if the 2 nd arm 20 is swung in the arrow a direction, the 2 nd support portion 37b of the wedge actuation plate 31 pushes up and slides the lower end portion of the floating wedge member 40. Accordingly, the tooth surface 43 of the floating wedge member 40 is brought into engagement with the gear portion 26. Further, the floating wedge member 40 is pressed into a wedge-shaped space formed between the wedge surface 18a and the gear portion 26 and gradually narrowed in the clockwise rotation direction (fig. 15). Therefore, the floating wedge member 40 restricts the swing of the 2 nd arm 20 in the a direction by the wedge action, and maintains (fixedly holds) the inclination angle of the 1 st arm 10 and the 2 nd arm 20.

As apparent from the above description, according to the first embodiment, there are the following advantages: a quiet angle adjustment fitting which does not generate rattle at all even if the 2 nd arm 20 is swung in either one of the A direction and the B direction can be obtained.

As shown in fig. 21 to 37, the second embodiment has substantially the same structure as the first embodiment described above. The difference is that a force spring 60 is assembled that bends the rod-shaped spring material into a substantially door-shaped form. The purpose is to eliminate the user's sense of uneasiness by generating a clicking sound only at the beginning of the operation of the 2 nd arm and immediately after the end of the operation, although no clicking sound is generated at all during the operation.

As shown in fig. 23 and 24, the second embodiment is substantially the same as the first embodiment, and includes the 1 st arm 10, the 2 nd arm 20, the noncontact free-holding mechanism 30, the floating wedge member 40, the 1 st and 2 nd housing portions 50 and 52, and the biasing spring 60.

In this embodiment, since the same parts as those of the first embodiment are substantially the same as those of the first embodiment except for the 1 st arm 10, the wedge operating plate 31, and the biasing spring 60, the same reference numerals are given to the same parts, and the description thereof is omitted.

The 1 st arm 10 is substantially the same as the first embodiment, and has a structure for mounting a biasing spring 60 described later, which is different from the first embodiment. As shown in fig. 25, the opposing wall portions 12 and 13 according to the second embodiment are substantially identical to the opposing wall portions 12 and 13 according to the first embodiment, and differ in the shape of the wedge-shaped window portion 18 and the structure for mounting the biasing spring 60 described later.

That is, as shown in fig. 25, the wedge-shaped window 18 of the opposing wall 13 has an inclined surface 18c and an arcuate surface 18d in addition to the wedge surface 18a and the guide surface 18b that are parallel to each other, as in the first embodiment. Further, the wedge-shaped window 18 has a notch 18e at a substantially center of the guide surface 18 b.

Further, the opposing wall portion 13 is provided with locking holes 19a and abutment pins 19b on the upper and lower sides of the wedge-shaped window portion 18, respectively.

As shown in fig. 26, the wedge operating plate 31 is substantially the same as the wedge operating plate 31 according to the first embodiment, and is different in the shape of the opening window 37. The opening window 37 has a shape that allows the floating wedge member 40 to be moved to a predetermined position and to be held without rattling, as in the first embodiment.

That is, the opening window 37 has a 1 st support 37a and a 2 nd support 37b which are vertically opposed to each other. The 1 st support portion 37a and the 2 nd support portion 37b are opposed to each other by a distance that can be supported by being in contact with an upper end edge portion and a lower end edge portion of the floating wedge member 40, which will be described later. However, in fig. 26, a step 37e lower than the 2 nd support 37b is formed on substantially half of the right side of the 2 nd support 37b. The relative distance between the 1 st support portion 37a and the step portion 37e is such that the upper end surface and the lower end surface of the floating wedge member 40 cannot simultaneously abut.

Since the other components are the same as those in the first embodiment, the same reference numerals are given to the same parts, and the description thereof will be omitted.

As shown in fig. 23 and 24, the biasing spring 60 is formed by bending a wire-like spring material into a substantially gate shape. The urging spring 60 is provided with locking ends 61 and 61 by bending both side ends thereof outward and in the same line.

Next, a method of assembling the structural members according to the second embodiment will be described.

First, the wedge operating plate 31 is assembled in advance between the gear plate portions 22, 23 of the 2 nd arm 20, and then the 2 nd arm 20 is integrated by caulking fixation using rivets 24, 24. On the other hand, the urging spring 60 is interposed between the opposing wall portions 12, 13 of the integrated 1 st arm 10. Then, the locking ends 61, 61 of the biasing spring 60 are locked to the locking holes 19a, 19a of the opposing wall portions 12, 13, respectively. Then, the gear plate portions 22 and 23 and the wedge plate 31 are inserted between the opposing wall portions 12 and 13 of the integrated 1 st arm 10, and the wedge plate 31 is inserted into the approximately gate-shaped biasing spring 60. Further, after the 2 nd shell portion 52 is positioned on the opposite wall portion 13, the support shaft 56 is passed through the shaft holes 53, 15, 25, 32, 25, 15 and temporarily fixed. Then, the floating wedge member 40 is inserted from the wedge-shaped window portion 18 of the opposing wall portion 12, and is inserted into the opening window portion 37 and the wedge-shaped window portion 18 of the opposing wall portion 13. Then, the shaft hole 51 of the 1 st housing portion 50 is fitted to the support shaft 56, thereby preventing the floating wedge member 40 from coming off. Finally, the gasket 55 is fitted to the support shaft 56, and one end portion of the protruding support shaft 56 is swaged, whereby the above-described components are connected and integrated.

Next, a method of using the angle adjustment fitting according to the second embodiment will be described.

First, as shown in fig. 32, if the 2 nd arm 20 is tilted in the arrow a direction with respect to the 1 st arm 10, the tooth surface 43 of the floating wedge member 40 is brought into engagement with the gear portion 26. The floating wedge member 40 is pressed into a wedge-shaped space formed between the linear wedge surface 18a and the gear portion 26 and gradually narrowed in the clockwise rotation direction. Therefore, the floating wedge member 40 restricts the swing of the 2 nd arm 20 in the a direction by the wedge action, thereby maintaining (fixedly holding) the inclination angle of the 1 st arm 10 and the 2 nd arm 20. At this time, the lower end portion of the floating wedge member 40 does not fall into the notch portion 18e of the wedge-shaped window portion 18.

That is, if in the engaged state shown in fig. 32, the tooth surface 43 of the floating wedge member 40 is engaged with the gear portion 26, the inclination angle of the 1 st arm 10 and the 2 nd arm 20 can be reliably maintained without sliding of the 2 nd arm 20.

Conversely, as shown in fig. 33, if the 2 nd arm 20 is swung in the arrow B direction, the wedge actuation plate 31 will start to co-rotate with the 2 nd arm 20 due to the drag rotation friction force generated based on the spring force of the wave spring portion 34. Accordingly, the tooth surface 43 of the floating wedge member 40 and the gear portion 26 start to separate. At the same time, the 1 st support portion 37a of the wedge actuation plate 31 pushes down the upper end surface of the floating wedge member 40. Accordingly, the floating wedge member 40 slides obliquely downward along the linear wedge surface 18a and the guide surface 18b, and moves downward of the wedge window 18. Then, the lower end portion of the floating wedge member 40 falls into the notch portion 18e of the wedge-shaped window portion 18. Therefore, a minute gap will be generated between the tooth surface 43 and the gear portion 26, and the floating wedge member 40 is formed in a non-contact free state. In the non-contact free state at this time, the floating wedge member 40 is biased toward the support shaft 56 by the biasing spring 60. Accordingly, the floating wedge member 40 is supported at the notch 18e, the 1 st support 37a of the wedge operating plate 31, and the urging spring 60 at 3. Therefore, in the non-contact free state, the floating wedge member 40 does not contact the gear portion 26, and therefore the 2 nd arm 20 can be swung quietly in the arrow B direction without generating an offensive click sound. Further, during the trailing rotation of the wedge actuation plate 31 and the 2 nd arm 20, since the floating wedge member 40 is pushed from above by the wedge actuation plate 31, the tooth surface 43 and the gear portion 26 do not mesh with each other.

That is, even when the 2 nd arm 20 is swung in the arrow B direction, the floating wedge member 40 is held without being loosened, and at the same time, the tooth surface 43 of the floating wedge member 40 is held in a non-contact state with the gear portion 26.

Further, as shown in fig. 34, if the 2 nd arm 20 is swung in the arrow B direction, the 2 nd protrusion 28 presses the upper end surface of the floating wedge member 40. Therefore, the lower end portion of the floating wedge member 40 pushes down the 2 nd support portion 37b of the wedge operating plate 31, so that the wedge operating plate 31 swings. Therefore, the stopper pin 17 passes over the convex portion 36a of the plate spring 36, and then the stopper pin 17 is locked in the locking concave portion 36b. Then, the 2 nd contact surface 42 of the floating wedge member 40 contacts the inclined surface 18c, and a storage state is formed (fig. 35).

In this storage state, the floating wedge member 40 is stored in the storage space, and the locking recess 36b of the leaf spring piece 36 is locked to the stopper pin 17. Therefore, even if the 2 nd arm 20 is swung in the a direction, the gear portion 26 is kept disengaged from the tooth surface 43 by the spring force of the plate spring piece 36 locked to the stopper pin 17. Therefore, the wedge operation plate 31 does not rotate together, and only the 2 nd arm 20 can swing freely in the a direction without rattling.

As shown in fig. 36, if the 2 nd arm 20 is swung in the arrow a direction, immediately before the 2 nd arm 20 reaches the final extended position formed linearly with respect to the 1 st arm 10, the locking pin 29 of the gear plate portion 23 is locked to the locking claw portion 35 of the wedge operation plate 31. Further, if the 2 nd arm 20 is swung slightly with force in the arrow a direction, the wedge operating plate 31 is also swung in the clockwise rotation direction (a direction) around the support shaft 56. Therefore, the stopper pin 17 is disengaged from the locking recess 36b of the leaf spring piece 36, and the stopper pin 17 is positioned in the guiding recess 36c of the leaf spring piece 36. Accordingly, the 2 nd support portion 37b of the wedge operating plate 31 pushes up the lower end surface of the floating wedge member 40, and the floating wedge member 40 in the stored state is moved upward. At this time, the upper end surface of the floating wedge member 40 also abuts against the 1 st support portion 37a of the wedge operating plate 31, so that the floating wedge member 40 does not come loose. And, due to drag rotational friction generated between the wedge actuation plate 31 and the 2 nd arm 20, both will rotate together. Accordingly, the floating wedge member 40 biased by the biasing spring 60 slides along the linear wedge surface 18a and the guide surface 18b toward the upper portion of the wedge window 18 (wedge space). Therefore, the tooth surface 43 of the floating wedge member 40 is brought into an engaged state with the gear portion 26 (fig. 37), and a collision sound is generated when the tooth surface 43 is engaged with the gear portion 26. By the collision sound, the user can know that the tooth surface 43 has engaged with the gear portion 26, and thus a sense of ease is generated.

Then, if the 2 nd arm 20 is swung again in the arrow B direction, the wedge actuation plate 31 starts to co-rotate with the 2 nd arm 20 due to the drag rotation friction force generated by the spring force of the wave spring portion 34. Then, the upper end surface of the floating wedge member 40 is pressed by the 1 st support portion 37a of the wedge actuation plate 31. Accordingly, the floating wedge member 40 slides along the linear wedge surface 18a and the guide surface 18b of the wedge window 18 and moves slightly in a direction away from the gear portion 26. Then, the lower end portion of the floating wedge member 40 falls into the notch portion 18 e. Therefore, a minute gap is generated between the tooth surface 43 and the gear portion 26, and the floating wedge member 40 is again brought into a non-contact free state (fig. 33). Therefore, even if the 2 nd arm 20 is swung in the arrow B direction, no click sound is generated.

Then, if the 2 nd arm 20 is swung in the arrow a direction, the step portion 37e of the drag-rotated wedge actuation plate 31 pushes up the floating wedge member 40. Accordingly, the floating wedge member 40 slides along the wedge surface 18a and the guide surface 18b after being separated from the notch 18 e. Accordingly, the tooth surface 43 of the floating wedge member 40 receiving the urging force of the urging spring 60 is brought into engagement with the gear portion 26 again. At this time, a collision sound is generated when the tooth surface 43 is engaged with the gear portion 26. Since the user can recognize the operation situation by listening to the collision sound, the user is given a sense of security. Further, the floating wedge member 40 is pressed into a wedge-shaped space formed between the wedge surface 18a and the gear portion 26 and gradually narrowed in the clockwise rotation direction. Accordingly, the floating wedge member 40 restricts the swing of the 2 nd arm 20 in the a direction by the wedge action, and maintains (fixedly holds) the inclination angle of the 1 st arm 10 and the 2 nd arm 20 (fig. 32).

As apparent from the above description, according to the second embodiment, there are the following advantages: even when the 2 nd arm 20 is swung in either one of the a direction or the B direction, a quiet angle adjustment fitting that does not generate rattle during the swinging operation can be obtained. However, when the tooth surface 43 of the floating wedge member 40 is engaged with the gear portion 26 of the gear plate portion 23 based on the swinging operation, a collision sound is generated. Therefore, the user can know the operation condition of the user, and thus feel a sense of security is obtained.

As shown in fig. 38 to 51, the third embodiment is substantially the same as the first embodiment described above, except that a swirl reverse suppressing spring 70 is incorporated.

The angle adjustment fitting according to the present invention is configured to restrict the tilting direction of the 2 nd arm 20 embedded in the headrest in a multistage manner and to maintain the position of the tilting position when applied to, for example, a headrest of a sofa. Therefore, the 2 nd arm 20 swings extremely slightly in the raising direction.

However, if the user sits on the seat portion, tension may act on the skin covering the seat portion, the backrest, and the leg rest. Therefore, the leg rest may be pulled in the rising direction to be suddenly raised, resulting in failure to maintain the desired final toppled state. Such a problem also occurs in the process of manufacturing the skin of the spread sofa and the disassembly and cleaning operation. Therefore, it is not easy to pack the skin in such a manner that the skin does not wrinkle.

The present embodiment aims to solve the above-described problems.

That is, the third embodiment is substantially the same as the first embodiment, and includes, as shown in fig. 40 and 41, the 1 st arm 10, the 2 nd arm 20, the noncontact free retention mechanism 30, the floating wedge member 40, the 1 st and 2 nd housing portions 50 and 52, and the reverse rotation suppressing spring 70. The 1 st arm 10 and the 2 nd arm 20 are integrated so as to be swingable about the axial center L by the support shaft 57.

The third embodiment differs from the first embodiment in the opposing wall portion 13 of the 1 st arm 10, the 2 nd arm 20, the reverse rotation suppressing spring 70, the fulcrum 57, and the auxiliary pin 58. The same reference numerals are given to the same parts and the description thereof is omitted.

The shaft hole 15 of the opposite wall portion 13 is not a circular hole, but a hexagonal shaft hole. This is to prevent the idling of the support shaft 57 described later. Therefore, the shaft hole 15 is not limited to a hexagon, and may be a polygon such as a triangle or a quadrangle. The shaft hole 15 may be substantially D-shaped, mainly circular, and may have a rotation stopping function.

The 2 nd arm 20 is different from the 2 nd arm 20 of the first embodiment in that the mounting positions of the gear plate portions 22, 23 with respect to the mounting portion 21 are opposite to those of the first embodiment.

As shown in fig. 40, the support shaft 57 is substantially the same as the support shaft 56 according to the first embodiment. However, the fulcrum 56 is different from the fulcrum 57 in that the shaft portion has an annular rib 57a at the base thereof and an engagement groove 57b is provided at the head thereof. The annular rib 57a prevents the support shaft 57 from idling. Accordingly, the annular rib 57a may have a polygonal shape such as a triangle or a quadrangle which can be fitted in the shaft hole 15. The annular rib 57a may be substantially D-shaped, which is mainly circular and has a rotation stopping function.

The auxiliary pin 58 engages with an end of a reverse rotation suppressing spring 70 described later, and is fixed to the gear plate portions 22 and 23 of the 2 nd arm 20 by caulking.

The reverse rotation suppressing spring 70 has a shape in which a band spring material is wound in a spiral shape, and both ends are bent to form locking ends 71, 72.

Next, the method of assembling the structural members according to the third embodiment is substantially the same as the first embodiment except that the support shaft 57 is used instead of the support shaft 56. The difference is that the auxiliary pin 58 is swaged and fixed after the assembly of the first embodiment is completed, and the locking ends 71 and 72 of the reverse rotation suppressing spring 70 are further engaged and assembled with the engaging groove 57b of the support shaft 57 and the auxiliary pin 58, respectively.

Next, a method of using the angle adjustment fitting according to the third embodiment will be described.

First, as shown in fig. 46, if the 2 nd arm 20 is tilted in the arrow a direction with respect to the 1 st arm 10, the tooth surface 43 of the floating wedge member 40 is brought into engagement with the gear portion 26. The floating wedge member 40 is pressed into a wedge-shaped space formed between the linear wedge surface 18a and the gear portion 26 and gradually narrowed in the clockwise rotation direction. Therefore, the floating wedge member 40 restricts the swing of the 2 nd arm 20 in the a direction by the wedge action, thereby maintaining (fixedly holding) the inclination angle of the 1 st arm 10 and the 2 nd arm 20.

That is, if in the engaged state shown in fig. 46, the tooth surface 43 of the floating wedge member 40 is engaged with the gear portion 26, the inclination angle of the 1 st arm 10 and the 2 nd arm 20 can be reliably maintained without sliding of the 2 nd arm 20.

Conversely, as shown in fig. 47, if the 2 nd arm 20 is swung in the arrow B direction, the wedge actuation plate 31 starts to co-rotate with the 2 nd arm 20 due to the drag rotation friction force generated by the spring force of the wave spring portion 34. Thus, the tooth surface 43 of the floating wedge member 40 starts to separate from the gear portion 26. At the same time, the 1 st support portion 37a of the wedge actuation plate 31 pushes down the upper end surface of the floating wedge member 40. Accordingly, the floating wedge member 40 slides along the linear wedge surface 18a and the guide surface 18b and moves to the lower side of the wedge window 18. Therefore, a minute gap will be generated between the tooth surface 43 and the gear portion 26, and the floating wedge member 40 forms a non-contact free state. In the non-contact free state, the floating wedge member 40 is supported at 4 of the wedge surface 18a, the guide surface 18b of the wedge window 18 and the 1 st and 2 nd support portions 37a and 37b of the wedge operation plate 31. In the non-contact free state, the floating wedge member 40 does not contact the gear portion 26, and therefore the 2 nd arm 20 can be swung in the arrow B direction without generating an offensive click sound. Further, during the generation of the drag rotational friction force between the wedge actuation plate 31 and the 2 nd arm 20, since the upper end surface of the floating wedge member 40 is pushed by the wedge actuation plate 31, the tooth surface 43 and the gear portion 26 do not mesh with each other.

Further, as shown in fig. 48, if the 2 nd arm 20 is swung in the arrow B direction, the 1 st projection 27 presses the upper end surface of the floating wedge member 40. Therefore, the lower end surface of the floating wedge member 40 will press the 2 nd support portion 37b of the wedge operating plate 31. Accordingly, the floating wedge member 40 rotates, and the stopper pin 17 passes over the convex portion 36a of the plate spring 36, and then the stopper pin 17 is locked in the locking concave portion 36b. Then, the 2 nd contact surface 42 of the floating wedge member 40 contacts the inclined surface 18c, and a storage state is formed (fig. 49).

In the storage state, the floating wedge member 40 is stored in the storage space, and the locking recess 36b of the leaf spring piece 36 is locked to the stopper pin 17. Therefore, even if the 2 nd arm 20 is swung in the B direction, the gear portion 26 is kept disengaged from the tooth surface 43 by the spring force of the leaf spring piece 36 engaged with the stopper pin 17. Therefore, the wedge operating plate 31 does not rotate together and only the 2 nd arm 20 can swing freely in the a direction.

Next, as shown in fig. 50, if the 2 nd arm 20 is swung in the arrow a direction, immediately before the 2 nd arm 20 reaches the final deployment position forming a right angle shape with respect to the 1 st arm 10, the locking pin 29 of the gear plate portion 23 is locked to the locking claw portion 35 of the wedge operation plate 31. Therefore, if the 2 nd arm 20 is swung in the arrow a direction with a little force, the wedge operating plate 31 swings in the clockwise rotation direction (a direction) about the support shaft 57. Therefore, the stopper pin 17 is disengaged from the locking recess 36b of the leaf spring piece 36, and the stopper pin 17 moves to the guiding recess 36c of the leaf spring piece 36. Accordingly, the 2 nd support portion 37b of the wedge operating plate 31 pushes up the lower end surface of the floating wedge member 40, and the floating wedge member 40 in the stored state is moved upward. At this time, the upper end surface of the floating wedge member 40 also abuts against the 1 st support portion 37a of the wedge operating plate 31, so that the floating wedge member 40 does not come loose. Also, due to the drag rotation friction force generated between the wedge actuation plate 31 and the 1 st arm 10, both will rotate together. Therefore, the floating wedge member 40 slides along the linear wedge surface 18a and the guide surface 18b toward the upper portion of the wedge window 18 (wedge space), and the tooth surface 43 of the floating wedge member 40 is brought into engagement with the gear portion 26 (fig. 51).

In the present embodiment, the position where the 2 nd arm 20 forms a right angle (90 degrees) with respect to the 1 st arm 10 is defined as the final extended position, but the present invention is not limited thereto. By appropriately selecting the range in which the center angle of the gear portion 26 is provided, for example, the position in which the 2 nd arm 20 forms an angle of 120 degrees with respect to the 1 st arm 10 may be set as the final deployed position.

Then, when the 2 nd arm 20 is swung again in the arrow B direction, the wedge actuation plate 31 starts to co-rotate with the 2 nd arm 20 due to the drag rotation friction force generated by the spring force of the wave spring portion 34 as shown in fig. 47. Then, the 1 st support portion 37a of the wedge actuation plate 31 pushes down the upper end surface of the floating wedge member 40. Accordingly, the floating wedge member 40 slides along the wedge surface 18a and the guide surface 18b of the wedge window 18 and moves slightly in a direction away from the gear portion 26. Therefore, a minute gap is generated between the tooth surface 43 and the gear portion 26, and the floating wedge member 40 is again brought into a non-contact free state. Therefore, even if the 2 nd arm 20 is swung in the arrow B direction, no click sound is generated.

Then, if the 2 nd arm 20 is swung in the arrow a direction, the 2 nd support portion 37b of the wedge actuation plate 31 pushes up and slides the lower end portion of the floating wedge member 40. Accordingly, the tooth surface 43 of the floating wedge member 40 is brought into engagement with the gear portion 26. Further, the floating wedge member 40 is pressed into a wedge-shaped space formed between the wedge surface 18a and the gear portion 26 and gradually narrowed in the clockwise rotation direction. Accordingly, the floating wedge member 40 restricts the swing of the 2 nd arm 20 in the a direction by the wedge action, and maintains (fixedly holds) the inclination angle of the 1 st arm 10 and the 2 nd arm 20 (fig. 46).

As apparent from the above description, according to the third embodiment, there are the following advantages: a quiet angle adjustment fitting which does not generate rattle at all even if the 2 nd arm 20 is swung in either one of the A direction and the B direction can be obtained.

In addition, according to the present embodiment, even if tension acts on the 2 nd arm 20 in the arrow B direction through a skin or the like, not shown, for example, in fig. 46, the tension is suppressed by the spring force of the reverse suppressing spring 70. Therefore, in the third embodiment, the occurrence of a problem due to the tension acting on the epidermis can be prevented. The present embodiment has the following advantages: the problem of skin-based tension generated in the manufacturing process can be prevented as well.

In the above embodiment, the case where the 1 st arm 10 is fixed and the 2 nd arm 20 is swung has been described, but this is not necessarily limited thereto. For example, it is of course also possible to fix the 2 nd arm 20 and to pivot the 1 st arm 10.

The angle adjustment fitting according to the present invention may be combined with the second embodiment. Therefore, the angle adjustment fitting that can suppress the swing of the 2 nd arm in the raising direction due to the tension of the sofa while generating the collision sound in the locked state can be obtained.

Industrial applicability

The angle adjustment fitting according to the present invention can be used for leg-less seats, sofas, headrests, leg rests, and the like. Further, the angle adjustment fitting according to the present invention can be applied to, for example, a rack or the like for swinging and opening/closing a door, as long as the device swings 2 structural members.

Symbol description

10. Arm 1

11. Mounting part

12. Opposite wall portions

13. Opposite wall portions

14. Rivet

15. Shaft hole

17. Limiting pin

18. Wedge-shaped window part

18a wedge surface

18b guide surface

18c inclined plane

18d arc surface

19a locking hole

19b abutment pin

20. Arm 2

21. Mounting part

22. Gear plate part

23. Gear plate part

24. Rivet

25. Shaft hole

26. Gear part

27. 1 st protrusion

28. 2 nd protrusion

29. Locking pin

30. Non-contact free retaining mechanism

31. Wedge actuation plate

32. Shaft hole

33. Annular sliding contact part

34. Wave spring part

35. Locking claw

36. Plate reed

36a convex part

36b locking recess

36c guiding recess

37. Open window

37a 1 st support part

37b No. 2 support

37c No. 1 connecting portion

37d No. 2 connecting portion

40. Floating wedge component

41. 1 st contact surface

42. 2 nd contact surface

43. Tooth surface

44. 3 rd contact surface

45. 4 th contact surface

46. Arc surface

47. Arc surface

48. Arc surface

50. 1 st shell portion

51. Shaft hole

52. 2 nd shell portion

54. Shaft hole

54. Elastic claw

55. Gasket ring

56. Support shaft

57. Support shaft

58. Auxiliary pin

60. Force spring

61. Locking end

70. Reverse-rotation suppressing spring

71. Locking end

72. Locking end

L axle center

A direction of swing

B direction of swing

Claims

1. An angle adjustment fitting, having:

a 1 st arm (10), wherein the 1 st arm (10) is provided with a wedge-shaped window (18) having a linear wedge surface (18 a);

a 2 nd arm (20), wherein the 2 nd arm (20) is supported relative to the 1 st arm (10) in a manner capable of swinging around an axle center, and is provided with a circular arc-shaped gear part (26); the method comprises the steps of,

a floating wedge member (40), wherein the floating wedge member (40) has a linear contact surface (41) on one surface side, the contact surface (41) contacts with a linear wedge surface (18 a) positioned at the outer edge of the wedge-shaped window (18),

on the other face side, a tooth surface (43) is provided, the tooth surface (43) meshes with the gear part (26),

the floating wedge member (40) is movably accommodated in a wedge-shaped space of the wedge-shaped window portion (18) which is not covered by the gear portion (26),

the floating wedge member (40) is pressed into a wedge-shaped space formed between the linear wedge surface (18 a) and the gear part (26) by sliding the linear contact surface (41) along the linear wedge surface (18 a) and meshing the tooth surface (43) with the gear part (26), thereby restricting the swing of the 2 nd arm (20) in the expanding direction relative to the 1 st arm (10), and the wedge-shaped space is gradually narrowed in the expanding direction of the 2 nd arm (20) relative to the 1 st arm (10).

2. The angle adjustment fitting of claim 1, wherein:

a linear guide surface (18 b) parallel to the wedge surface (18 a) is formed at a position facing the wedge surface (18 a) of the wedge window (18).

3. The angle adjustment fitting of claim 1, wherein:

an abutment surface (44) parallel to the abutment surface (41) is formed on an edge portion of a tooth surface (43) of the floating wedge member (40).

4. The angle adjustment fitting of claim 1, wherein:

in the floating wedge member (40), a pair of straight contact surfaces (41, 42) are formed in a mirror shape.

5. The angle adjustment fitting of claim 1, wherein:

arc surfaces (46, 47, 48) are formed between the pair of straight contact surfaces (41, 42).

6. The angle adjustment fitting of any one of claims 1 to 5, wherein:

a non-contact free holding mechanism (30) is provided, and the non-contact free holding mechanism (30) releases and holds the tooth surface (43) of the floating wedge member (40) and the gear part (26) of the 2 nd arm (20) in a non-contact manner when the 2 nd arm (20) is swung.

7. The angle adjustment fitting of claim 6, wherein:

The angle adjustment fitting is constructed in the following manner:

the non-contact free holding mechanism (30) has a wedge actuation plate (31), the wedge actuation plate (31) rotates within a small angle range by its drag rotation friction with the 2 nd arm (20),

by swinging the 2 nd arm (20) relative to the 1 st arm (10) in one direction (B), the wedge actuation plate (31) releases the tooth surface (43) of the floating wedge member (40) from the gear portion (26) in a non-contact manner and forms a non-contact released state,

further, by the small-angle swing in the other direction (A), the floating wedge member (40) is pressed between the linear wedge surface (18 a) formed on the 1 st arm (10) side and the gear portion (26), the tooth surface (43) of the floating wedge member (40) and the gear portion (26) are brought into engagement, and the relative swing of the 2 nd arm (20) with respect to the 1 st arm (10) in the other direction (A) is restricted by the wedge action of the floating wedge member (40).

8. The angle adjustment fitting of any one of claims 1 to 5, wherein:

a force spring (60) is provided, and the force spring (60) is attached to the 1 st arm (10) so as to generate a collision sound when the tooth surface (43) of the floating wedge member (40) is engaged with the gear portion (26) to form a locked state by applying force to the floating wedge member (40) toward the axial center side.

9. The angle adjustment fitting of any one of claims 1 to 5, wherein:

a reverse rotation suppressing spring (70) is provided, one end (71) of the reverse rotation suppressing spring (70) is locked to a support shaft (57) arranged at the axial center, and the other end (72) is locked to the 2 nd arm (20), and the swing of the 2 nd arm (20) in the rising direction is suppressed by the spring force of the swirl spring material.

10. A piece of furniture, characterized in that:

incorporating an angle adjustment fitting as claimed in any one of claims 1 to 9.