JP2017042483A - furniture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide furniture such as a chair that can be a compact folding state.SOLUTION: Furniture includes a horizontal part 2A, and a standing part 3A arranged at the end of the horizontal part. Standing frames 3 of the standing part 3A are divided into a lower frame part 4 and an upper frame part 5 at middle parts of the standing frames 3 in a height direction. Each lower frame part 4 and each upper frame part 5 are connected via joint devices 10A. Each joint device 10A includes a first arm 11 attached to one of the upper and lower frame parts 4, 5, and a second arm 21 attached to the other one. The first arm 11 is pivotally attached to the second arm 21 so as to be relatively rotatable, so that the upper frame part 4 can be moved from a folding position for folding toward the horizontal part 2A to a use position for arrangement when used as the standing part 3A. The joint device 10A has a lock mechanism for locking the rotation of the first arm 11 so as to allow the upper frame part 4 to be fixed at the use position.SELECTED DRAWING: Figure 2

Description

  The present invention includes a horizontal portion (e.g., a seat portion) disposed substantially horizontally, and a rising portion (e.g., a backrest portion, an armrest portion) provided at an end of the horizontal portion so as to rise from the horizontal portion. It is related with the furniture (example: chair) which comprises.

  As shown in FIG. 20, as a furniture, for example, a seat chair 101, which is a kind of a reclining chair, is provided with a seat portion 102A as a horizontal portion and a rear end portion of the seat portion 102A so as to rise from the seat portion 102A. And a backrest portion 103A as a rising portion.

  Furthermore, the seat 101 is generally connected to the rear end portion of the seat frame 102 of the seat portion 102A and the lower end portion of the back frame 103 of the backrest portion 103A via an angle adjuster 109 having a ratchet mechanism or the like. In other words, the deployment angle α of the back frame 103 (backrest 103A) with respect to the seat frame 102 (seat 102A) can be adjusted by the angle adjuster 109 (see, for example, Patent Documents 1 to 7). .

  In such a seat 101, the back frame 103 can rotate in a rotation direction (this rotation direction is referred to as “forward rotation direction”) rising from a state in which the back frame 103 is expanded about 180 ° with respect to the seat frame 102. In the rotation direction in which the back frame 103 stands up with respect to the seat frame 102 and falls backward (this rotation direction is referred to as “reverse rotation direction”), the back frame 103 is provided with a reverse rotation restricting mechanism provided in the angle adjuster 109. (Example: Reverse rotation restricting function of ratchet mechanism) It is restricted so that it cannot rotate.

  In the case of rotating the back frame 103 in the reverse rotation direction, first, the restriction by the reverse rotation restriction mechanism of the angle adjuster 109 is released by rotating the back frame 103 to the maximum in the forward rotation direction, or the angle adjuster 103. The restriction release operation of releasing the restriction by the reverse rotation restriction mechanism is performed by operating a restriction release lever (not shown) attached to. Thereafter, the back frame 103 is rotated in the reverse rotation direction.

  Further, cushion bodies 106 and 107 (shown by alternate long and short dash lines) are respectively attached to the seat frame 102 and the back frame 103 so as to cover the entire frames.

Japanese Patent Laid-Open No. 9-19339 JP 2009-189391 A JP 2010-88682 A JP 2011-167354 A JP 2013-183939 A JP 2013-185671 A JP 2014-30614 A

  Thus, when the seat 101 is transported for shipment from the manufacturing factory, as shown in the figure, the seat 101 is packed with the back frame 103 standing up (eg, a cardboard box). When packed in 180, there is a problem that the packing size becomes very large.

  In addition, as shown in FIG. 21, the back frame 103 is tilted horizontally backward so that the back frame 103 is expanded 180 degrees with respect to the seat frame 102, and then the seat chair 101 is placed in the packing box 180. In the case of packing, when the packing box 180 is lifted, the back frame 103 may unexpectedly rotate in the forward rotation direction as indicated by a two-dot chain line in FIG. If it becomes like this, there exists a possibility that the wrinkle 180a may arise in the packaging box 180, or the packaging box 180 may be damaged. Therefore, in order to return the back frame 103 to the original unfolded state, it is necessary to take out the seat 101 from the packing box 180 and perform the above-described restriction release operation on the reverse rotation restricting mechanism of the angle adjuster 109, which is a troublesome work. Is forced.

  Therefore, the seat chair 101 is placed in two positions by lying the back frame 103 forward (that is, on the side of the seat portion 102A) so that the backrest portion 103A of the seat chair 101 overlaps the seat portion 102A substantially in parallel with the seat portion 102A. It can be considered that the folding chair is folded and the seat chair 101 is packed in this state.

  However, in this case, the back frame 103 must be rotated in the forward rotation direction until the deployment angle α of the back frame 103 with respect to the seat frame 102 becomes about 0 °. Since the minimum angle is not set to about 0 °, the seat 101 cannot be brought into the folded state described above. Even if the minimum angle of the deployment angle α of the back frame 103 by the angle adjuster 109 is set to about 0 °, the back frame 103 should be laid forward to bring the seat 101 into the above-described folded state. Even so, because the cushion bodies 106 and 107 attached to the seat frame 102 and the back frame 103 interfere with each other, the seat 101 cannot be folded.

  This invention is made | formed in view of the technical background mentioned above, The objective is to provide furniture, such as a chair which can be made into a compact folding state.

  The present invention provides the following means.

[1] A horizontal portion arranged substantially horizontally, and a rising portion provided at the end of the horizontal portion so as to rise from the horizontal portion and having a rising frame,
The rising frame is divided into an upper frame portion and a lower frame portion at an intermediate portion in the height direction of the rising frame, and
The upper frame part and the lower frame part are connected via an articulator,
The articulator includes a first arm attached to one of the upper frame part and the lower frame part, and a second arm attached to the other,
The first arm is configured to move from a lying position where the upper frame portion has fallen to the horizontal portion side with respect to the lower frame portion to a use position that is arranged when the rising portion is used. The two arms are pivotally mounted so as to be rotatable relative to the second arm,
Furthermore, the articulator is a furniture provided with a lock mechanism that locks the rotation of the first arm so that the upper frame portion moved from the lying position to the use position is fixed to the use position.

  [2] The furniture according to item 1, wherein the articulator includes a lock release mechanism that releases the lock of the rotation of the first arm by the lock mechanism.

[3] The first arm is pivotally attached to the second arm via a pivot pin,
The pivot pin is movable along the axial direction to a locked position and an unlocked position;
The locking mechanism is configured such that the rotation of the first arm is locked when the pivot pin is disposed at the locking position.
The furniture according to item 2, wherein the unlocking mechanism is configured such that the rotation of the first arm is unlocked when the pivot pin moves from the locked position to the unlocked position.

[4] The pivot pin is inserted into a first engagement hole provided in the first arm so as to be movable from the locked position to the unlocked position.
Further, the pivot pin is provided on the second arm so as not to rotate with respect to the second arm when the pivot pin is disposed at the lock position and the unlock position, respectively.
A part of the pivot pin in the axial direction is provided with a non-circular portion having a non-circular cross section having a lock tooth portion bulging outward in the radial direction,
The cross-sectional shape of the first engagement hole is such that the non-circular portion of the pivot pin can be fitted into the first engagement hole and the non-circular portion fitted into the first engagement hole. On the other hand, the first engagement hole is formed in a non-rotatable shape,
In the locking mechanism, when the pivot pin is arranged at the lock position, the non-circular portion of the pivot pin is fitted into the first engagement hole, and the rotation of the first arm is locked. Is configured as
When the pivot pin moves from the lock position to the lock release position, the non-circular portion of the pivot pin is pulled out from the first engagement hole and the lock release mechanism is moved to the first arm. The furniture according to the preceding item 3, wherein the furniture is configured such that the rotation is unlocked.

  [5] The locking tooth portion formed separately from the pivot pin is arranged in a fixed state on the outer peripheral surface of the part of the pivot pin in the axial direction, whereby the axial direction of the pivot pin is The furniture according to item 4, wherein the non-circular portion is formed in part.

[6] The lock tooth portion is integrally formed with an annular stopper member having an insertion hole through which the pivot pin is inserted.
The stopper member is inserted into the insertion pin in the insertion hole so that the locking tooth portion is fixedly arranged on the part of the outer peripheral surface in the axial direction of the axis pin. Is fixed,
The lock mechanism is configured such that the movement of the pivot pin is stopped by the stopper member coming into contact with the outer surface of the second arm when the pivot pin moves from the unlocked position to the locked position. The furniture according to item 5 above.

[7] The second arm is provided with a second engagement hole,
The cross-sectional shape of the second engagement hole is the same as the cross-sectional shape of the first engagement hole,
The pivot pin is provided on the second arm so that the non-circular portion is not rotatable with respect to the second arm when the non-circular portion is inserted into the second engagement hole in a fitted state. The furniture according to any one of 4 to 6 above.

[8] The pivot pin is biased by a biasing member in a direction of moving from the unlocking position to the locking position,
The locking mechanism is configured such that the pivot pin is held at the unlocked position against the urging force of the urging member when the upper frame part is arranged at the lying position, and the upper frame part is used at the use position. The furniture according to any one of the preceding items 3 to 7, wherein the pivot pin is configured to move from the unlocked position to the locked position by a biasing force of the biasing member when disposed at the position.

  [9] The lock release mechanism according to any one of items 3 to 8, wherein the lock release mechanism is configured to stop the movement of the pivot pin when the pivot pin moves from the lock position to the lock release position. furniture.

[10] One end portion side of the pivot pin is disposed so as to protrude outward from the outer surface of the first or second arm,
The pivot pin is extrapolated to a projecting portion of the pivot pin that projects outward from the outer surface of the first or second arm, and is disposed between the outer surface and the one end of the pivot pin. A compression coil spring as a biasing member is elastically biased in the direction of moving from the unlocked position to the locked position,
The lock release mechanism stops the movement of the pivot pin when the compression coil spring comes into close contact when the pivot pin moves from the lock position to the lock release position against the biasing force of the compression coil spring. The furniture according to the preceding item 9, wherein the furniture is configured as described above.

[11] One end side of the pivot pin is disposed so as to protrude outward from the outer surface of the first or second arm,
The unlocking mechanism is configured such that the rotation of the second arm is unlocked by pressing the one end of the pivot pin so that the pivot pin moves from the locked position to the unlocked position. The furniture according to any one of 3 to 10 above, which is configured.

[12] A cap-shaped cover is attached to the one end of the pivot pin so as to cover the one end.
The unlocking mechanism is configured such that when the one end portion of the pivot pin is pushed and the pivot pin is moved from the lock position to the lock release position, the opening end portion of the cover is the first or second arm. The furniture according to the preceding item 11, wherein the furniture is configured such that the movement of the pivot pin is stopped by contacting the outer surface.

  [13] Any of the preceding items 1 to 12, wherein the end portion of the horizontal portion and the lower end portion of the lower frame portion are connected via an angle adjuster that adjusts a deployment angle of the rising portion with respect to the horizontal portion. Furniture described in crab.

  The present invention has the following effects.

  In the furniture of the preceding item [1], the furniture can be made into a compact folded state by arranging the upper frame portion of the rising frame in the lying down position when transporting the furniture. Therefore, it is possible to reduce furniture transportation costs.

  Further, when using furniture, the upper frame part can be fixed at the use position by moving the upper frame part from the lying down position to the use position and locking the rotation of the second arm by the lock mechanism of the articulator. .

  In the preceding item [2], the lock of the rotation of the first arm can be released by the lock release mechanism.

  In the previous item [3], the rotation of the first arm is locked by moving the pivot pin to the locked position, and the rotation of the first arm is unlocked by moving the pivot pin from the locked position to the unlocked position. Therefore, the locking mechanism and the unlocking mechanism can be simplified, and the locking operation and the unlocking operation can be performed with a simple operation.

  In the preceding item [4], the rotation of the first arm is locked by fitting the non-circular portion of the pivot pin into the first engagement hole of the first arm, and the non-circular portion of the pivot pin is Since the lock of the rotation of the first arm is released by being extracted from the one engagement hole, the lock mechanism and the lock release mechanism can be reliably simplified.

  In the preceding item [5], since the lock tooth portion is formed separately from the pivot pin, the non-circular portion can be easily formed on the pivot pin.

  In the preceding item [6], since the lock tooth portion is formed integrally with the annular stopper member, the lock tooth portion can be easily attached to the pivot pin.

  Furthermore, since the movement of the pivot pin is stopped by the stopper member coming into contact with the outer surface of the second arm when the pivot pin moves from the unlocked position to the locked position, the pivot pin can be reliably stopped at the locked position. it can.

  In the previous item [7], the pivot pin is provided on the second arm so that the non-circular portion is inserted into the second engagement hole in a fitted state so that the pivot pin cannot be rotated with respect to the second arm. As a result, the mounting structure of the pivot pin and the second arm can be simplified.

  In the previous item [8], the pivot pin is moved from the unlocked position to the locked position by the urging force of the urging member when the upper frame portion is disposed at the use position, so that the locking operation can be easily performed.

  In the previous item [9], since the movement of the pivot pin is stopped when the pivot pin is moved from the lock position to the lock release position, the pivot pin can be reliably stopped at the lock release position.

  In the previous item [10], since the pivot pin is moved from the unlocked position to the locked position by the biasing force of the compression coil spring as the biasing member, the locking operation can be easily performed.

  Further, when the pivot pin moves from the lock position to the unlock position, the movement of the pivot pin is stopped by the contact of the compression coil spring, so that the pivot pin can be reliably stopped at the unlock position by the compression coil spring. it can.

  Thus, the compression coil spring has two roles of a biasing member that moves the pivot pin from the unlocked position to the locked position and a movement stop member that stops the movement of the pivot pin. Thereby, the number of parts of an articulator can be reduced.

  In the previous item [11], since one end of the pivot pin is pushed, the rotation lock of the first arm is released, so that the unlocking operation can be performed more easily.

  In the previous item [12], since the cover is attached to one end portion of the pivot pin, the pain felt when the unlocking operator who performs the unlocking operation pushes one end portion of the pivot pin with a finger or the like can be alleviated. And the damage of the cushion body by the contact with the one end part of a pivot pin and a cushion body can be suppressed.

  Further, when the pivot pin moves from the locked position to the unlocked position, the opening end of the cover comes into contact with the outer surface of the first or second arm, so that the movement of the pivot pin is stopped. It can be reliably stopped at the unlocked position.

  Thus, the cover has three roles: a pain relief member that relieves pain of the unlocking operator, a damage suppression member that restrains damage to the cushion body, and a movement stop member that stops the movement of the pivot pin. ing. Thereby, the number of parts of an articulator can be reduced.

  In the previous item [13], the expansion angle of the rising portion with respect to the horizontal portion can be adjusted by the angle adjuster.

  Further, since the upper frame portion is fixed at the use position by the rotation of the first arm being locked by the lock mechanism, when adjusting the expansion angle of the rising portion with respect to the horizontal portion, the upper portion of the rising portion is grasped. Even if adjustment work is performed, the upper frame does not move inadvertently toward the lying position. Therefore, adjustment work can be easily performed.

FIG. 1 is a perspective view showing a seat chair as furniture according to the first embodiment of the present invention in a state in use. FIG. 2 is a perspective view of the seat chair in a folded state. FIG. 3 is a side view of a state in which the seat chair is folded and packed. FIG. 4A is a perspective view showing the left joint device of the seat chair in a state where the rotation of the first arm is locked. FIG. 4B is a perspective view of the left articulator in the state of FIG. 4A as seen from another angle. FIG. 4C is a cross-sectional view of the left articulator in the state of FIG. 4A. FIG. 5 is a cross-sectional view corresponding to FIG. 4C in a state in which the pivot pin of the left articulator is moved to the unlocked position. FIG. 6A is an exploded perspective view of the left articulator. FIG. 6B is an exploded perspective view of the left articulator as seen from another angle. FIG. 7A is a perspective view of a state in which the first arm of the left articulator is rotating from the use position to the lying position. FIG. 7B is a perspective view of the left articulator in the state of FIG. 7A viewed from another angle. FIG. 7C is a cross-sectional view of the left articulator in the state of FIG. 7A. FIG. 8A is a perspective view of a state in which the first arm of the left articulator has rotated to a lying position. FIG. 8B is a cross-sectional view of the left articulator in the state of FIG. 8A. FIG. 9A is a perspective view showing a left joint device of a seat chair as furniture according to the second embodiment of the present invention in a state where the rotation of the first arm is locked. FIG. 9B is a cross-sectional view of the left articulator in the state of FIG. 9A. FIG. 10 is a cross-sectional view corresponding to FIG. 9B in a state in which the pivot pin of the left articulator is moved to the unlocked position. FIG. 11A is a perspective view showing a left articulator of a seat chair as furniture according to the third embodiment of the present invention in a state in which the rotation of the first arm is locked. FIG. 11B is a cross-sectional view of the left articulator in the state of FIG. 11A. FIG. 12 is a cross-sectional view corresponding to FIG. 11B in a state where the pivot pin of the left articulator is moved to the unlocked position. FIG. 13: is a disassembled perspective view of the left joint device of the seat chair as furniture based on 4th Embodiment of this invention. FIG. 14A is a perspective view showing a left joint device of a seat chair as furniture according to the fifth embodiment of the present invention in a state in which the rotation of the first arm is locked. FIG. 14B is a cross-sectional view of the left articulator in the state of FIG. 14A. FIG. 15 is a cross-sectional view corresponding to FIG. 14B in a state in which the pivot pin of the left articulator is moved to the unlocked position. FIG. 16A is an exploded perspective view of the left articulator. FIG. 16B is a perspective view (a left view (a) and a rear view (a right view (b)) of a stopper member with a lock tooth portion of a left joint device. FIG. 17A is a perspective view of a state in which the first arm of the left articulator is rotating from the use position to the lying position. FIG. 17B is a cross-sectional view of the left articulator in the state of FIG. 17A. FIG. 18 is a side view of a seat chair as furniture according to the sixth embodiment of the present invention. FIG. 19 is a schematic perspective view of a sofa as furniture according to the seventh embodiment of the present invention. FIG. 20 is a side view of a state in which a conventional seat is packed. FIG. 21 is a side view of a state in which a conventional seat is packed in another packing form.

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

  FIGS. 1-8B is a figure explaining 1st Embodiment of this invention.

  As shown in FIG. 1, a seat chair 1A as furniture according to the first embodiment of the present invention includes a seat portion 2A as a horizontal portion arranged horizontally and a backrest portion 3A as a rising portion. It has. The seat 2A has a seat frame 2 as a horizontal frame arranged horizontally. The backrest portion 3A has a back frame 3 as a rising frame arranged in a rising manner with respect to the horizontal frame. In the figure, the back frame 3 (backrest portion 3A) is arranged in a standing manner with respect to the seat frame 2 (seat portion 2A) at the rear end portion of the seat frame 2 (seat portion 2A).

  In FIG. 1, “L” indicates the left side of the seat 1A, and “R” indicates the right side of the seat 1A. Further, “6” is a cushion body for the seat portion 2A (indicated by a one-dot chain line), and “7” is a cushion body for the backrest portion 3A (indicated by a one-dot chain line). Both cushion bodies 6 and 7 are formed integrally connected to each other. The configuration of each cushion body 6, 7 will be described later.

  The seat frame 2 is made of a metal round pipe material bent in a substantially U shape, and includes a pair of left and right side frame portions 2a and 2b arranged in parallel and spaced apart from each other, and two side frame portions 2a and 2b. And a front frame portion 2c in which both front ends are connected to each other. In the seat chair 1A of the first embodiment, at least the rear end portions 2aa and 2ba of the side frame portions 2a and 2b of the seat frame 2 are formed straight, that is, are arranged substantially horizontally.

  A rear frame portion 2d for preventing overturning is provided inside the rear end portions 2aa and 2ba of both side frame portions 2a and 2b of the seat frame 2 to prevent the seat chair 1A from falling backward. The rear frame portion 2d is made of a metal round pipe material bent in a substantially U shape. And both the rear end parts 2aa and 2ba of the both side frame parts 2a and 2b of the seat frame 2 are connected via the rear frame part 2d.

  The back frame 3 is divided into an upper back frame portion 4 and a lower back frame portion 5 at a predetermined division position in an intermediate portion in the height direction of the back frame 3 (that is, the rising direction of the back frame 3). The detailed division position of the back frame 3 will be described later.

  The upper back frame portion 4 is made of a metal round pipe material bent in a substantially U-shape, and is a pair of left and right upper frame portions 4a and 4b arranged in parallel and spaced apart from each other, and both upper frame portions 4a. 4b, and an upper frame portion 4c connecting both upper ends of 4b.

  The lower back frame portion 5 includes a pair of left and right lower frame portions 5a and 5b that are spaced apart from each other and arranged in parallel. Each lower frame portion 5a, 5b is made of a straight cylindrical metal pipe material. And both lower frame parts 5a and 5b are connected via the straight reinforcement frame 5c arrange | positioned horizontally. The reinforcing frame 5c is made of a metal round pipe material.

  In the back frame 3, the lower end portion of the upper left frame portion 4a of the upper back frame portion 4 and the upper end portion of the lower left frame portion 5a of the lower back frame portion 5 are connected via the left joint device 10A. A lower end portion of the upper right frame portion 4 b of the frame portion 4 and an upper end portion of the lower right frame portion 5 b of the lower back frame portion 5 are connected via the right articulator 60. The configurations of the left joint device 10A and the right joint device 60 will be described later.

  The left rear end 2aa of the left frame 2a of the seat frame 2 and the lower end of the lower left frame 5a of the lower back frame 5 are connected via a left angle adjuster 9, and the right frame of the seat frame 2 is connected. The right rear end portion 2ba of the portion 2b and the lower end portion of the lower right frame portion 5b of the lower back frame portion 5 are connected via a right angle adjuster 9.

  Each angle adjuster 9 adjusts the deployment angle α of the back frame 3 (backrest portion 3A) with respect to the seat frame 2 (seat portion 2A), and more specifically, the lower back frame of the back frame 3 with respect to the seat frame 2 The expansion angle α of the part 5 is adjusted. Each angle adjuster 9 has a ratchet mechanism. Both angle adjusters 9, 9 have the same shape and the same configuration.

  Here, in order to facilitate understanding of the configuration and operation of the seat chair 1A, the two angle adjusters 9, 9 and the two articulators 10A, 60, for the sake of convenience, the rotation angle α of the back frame 3 with respect to the seat frame 2 is reduced. The direction is defined as “the forward rotation direction (of the back frame 3)”, and the rotation direction in which the deployment angle α of the back frame 3 with respect to the seat frame 2 is increased is defined as “the reverse rotation direction (of the back frame 3)”.

  Each angle adjuster 9 is configured to allow rotation of the back frame 3 in the forward rotation direction but restrict (block) rotation of the back frame 3 in the reverse rotation direction by a reverse rotation restriction function of the ratchet mechanism. Has been. Therefore, the back frame 3 can rotate in the forward rotation direction but cannot rotate in the reverse rotation direction.

  When the back frame 3 is rotated in the reverse rotation direction, a restriction release operation is performed to release the restriction by the ratchet mechanism of the angle adjusters 9 and 9 by rotating the back frame 3 to the maximum in the forward rotation direction. As a result, the back frame 3 can be rotated in the reverse rotation direction.

  The seat frame 2 (including the rear frame portion 2d) and the angle adjusters 9 and 9 are disposed inside the cushion body 6 for the seat portion 2A, whereby the cushion body 6 for the seat portion 2A is formed of these members. It is attached to the seat frame 2 so as to cover the whole of (2, 9, 9).

  The back frame 3 (including the reinforcing frame 5c) and the joints 10A and 60 are arranged inside the cushion body 7 for the backrest portion 3A, whereby the cushion body 7 for the backrest portion 3A is made of these members. (3, 10A, 60) is attached to the back frame 3 so as to cover the whole.

  The cushion body 6 for the seat portion 2A and the cushion body 7 for the backrest portion 3A are each made of urethane (eg, urethane foam) having elasticity, and the cushion bodies 6 and 7 are integrally connected to each other as described above. ing. Further, the entire surfaces of the cushion bodies 6 and 7 are covered with a flexible surface cover.

  As shown in FIG. 3, the division position of the upper back frame portion 4 and the lower back frame portion 5 in the back frame 3 is the upper back frame in the backrest portion 3A when the upper back frame portion 4 is placed in the lying down position. The corresponding portion of the portion 4 is a position that can overlap the seat portion 2A substantially in parallel with the seat portion 2A. More specifically, it is a position near the lower end of the intermediate portion in the height direction of the back frame 3 and the seat portion 2A. It is a position slightly higher than the seating surface 2Aa.

  Next, the configuration of the left and right articulators 10A and 60 will be described below.

  One of the articulators 10A and 60 is provided with a predetermined lock mechanism 50 and an unlock mechanism 51, and the other is not provided with such a mechanism. In the first embodiment, the left articulator 10 </ b> A includes a lock mechanism 50 and a lock release mechanism 51.

  The right articulator 60 does not include a lock mechanism and a lock release mechanism. Therefore, as shown in FIGS. 1 and 2, the right articulator 60 includes a lower end portion of the upper right frame portion 4 b of the upper frame portion 4 of the back frame 3 and an upper end portion of the lower right frame portion 5 b of the lower frame portion 5. The part is connected to one direction and oppositely in a rotation free manner. That is, in the right joint 60, the first arm 61 attached to the lower end portion of the upper right frame portion 4b of the upper back frame portion 4 and the upper end portion of the lower right frame portion 5b of the lower back frame portion 5 are attached. A second arm 62 is pivotally mounted in both directions of rotation.

  As shown in FIGS. 4A to 4C, the left joint device 10A includes a first arm 11, a second arm 21, and the like. Each of the first and second arms 11 and 21 is formed by bending a metal plate into a predetermined shape.

  As shown in FIGS. 4C, 6A and 6B, the first arm 11 includes a cylindrical attachment portion 12 attached to the lower end portion of the upper left frame portion 4a of the upper back frame portion 4, and a proximal end side of the attachment portion 12. In other words, it has a pair of left and right connecting plate portions 13 and 14 formed integrally with the mounting portion 12 (at the lower end side). Both the connecting plate portions 13 and 14 are arranged to be opposed to each other in the left-right direction.

  In the first arm 11, the left connecting plate portion 13 which is a connecting plate portion located outside the backrest portion 3A among the connecting plate portions 13 and 14 has a first shaft hole 15 (see FIG. 6A) is provided. A first engagement hole 16 (see FIG. 6B) having a non-circular cross section is formed in the right connection plate portion 14, which is a connection plate portion located on the inner side of the backrest portion 3 </ b> A among the connection plate portions 13 and 14. Is provided. Details of the cross-sectional shape of the first engagement hole 16 will be described later.

  As shown in FIGS. 4C, 6A and 6B, the second arm 21 includes a cylindrical attachment portion 22 attached to the upper end portion of the lower left frame portion 5a of the lower back frame portion 5, and a proximal end side of the attachment portion 22. In other words, it has a pair of left and right connecting plate portions 23, 24 formed integrally with the mounting portion 22 (that is, on the upper end side). Both connecting plate portions 23 and 24 are spaced apart from each other in the left-right direction and are arranged in an opposing manner.

  In the second arm 21, the left connecting plate portion 23, which is a connecting plate portion located outside the backrest portion 3A among the connecting plate portions 23 and 24, has a second shaft hole 25 (see FIG. 6A) is provided. The right coupling plate portion 24, which is the coupling plate portion located inside the backrest portion 3A among the coupling plate portions 23 and 24, has a second engagement hole 26 (see FIG. 6B) having a non-circular cross section. Is provided. Details of the cross-sectional shape of the second engagement hole 26 will be described later.

  As shown in FIG. 4C, the two connecting plate portions 13 and 14 of the first arm 11 are arranged between the connecting plate portions 23 and 24 of the second arm 21, and in this state, the metal head A pivot pin 30 formed of a rivet with a portion 33 extends from the right outer side of the right connecting plate portion 24 of the second arm 21 to the second engagement hole 26, the first engagement hole 16, the first shaft hole 15, and the second shaft hole 25. It is inserted so as to be slidable along the axial direction of the pivot pin 30 so as to communicate sequentially. “J” is the axis of the pivot pin 30. This axis J is directed in the left-right direction. The configuration of the pivot pin 30 will be described later.

  The right connecting plate portion 14 of the first arm 11 and the right connecting plate portion 24 of the second arm 21 are arranged so as to overlap each other. Similarly, the left connecting plate portion 13 of the first arm 11 and the left connecting plate portion 23 of the second arm 21 are arranged so as to overlap each other.

  As shown by a two-dot chain line in FIG. 4C, the attachment portion 12 of the first arm 11 is fitted with a predetermined fixing means (for example, caulking fixing) in a state of being fitted into the lower end portion of the upper left frame portion 4a of the upper back frame portion 4. , Rivet fastening, welding).

  As shown by a two-dot chain line in the drawing, the mounting portion 22 of the second arm 21 is a predetermined fixing means (for example, caulking fixing) while being fitted in the upper end portion of the lower left frame portion 5a of the lower back frame portion 5. , Rivet fastening, welding).

  Further, as shown in FIGS. 1 and 2, the first arm 11 has an upper back from a lying position (FIG. 2) where the upper back frame portion 4 has fallen to the seat portion 2 </ b> A side with respect to the lower back frame portion 5 in a standing state. Further, the upper back frame portion 4 is moved from the use position (FIG. 1) to the lying position (FIG. 1) so that the frame portion 4 can be moved to the use position (FIG. 1) disposed when the frame portion 4 is used as the backrest portion 3A. 2) It is pivotally attached to the second arm 21 via a pivot pin 30 so as to be rotatable relative to the second arm 21 so as to be movable to 2).

  As shown in FIG. 3, the seat chair 1A is in a state in which the upper back frame portion 4 is disposed in the lying position, that is, the corresponding portion of the upper back frame portion 4 in the backrest portion 3A is on the seat portion 2A. The seat 1A is folded so as to be substantially parallel to the package, and is packed in a packing box (eg, a cardboard box) 80 for packing.

  4A and 4B, the arrow “X” indicates the direction in which the first arm 11 rotates due to the movement of the upper back frame portion 4 from the use position to the lying down position. An arrow “Y” indicates a direction in which the first arm 11 rotates due to the movement of the upper back frame portion 4 from the lying position to the use position.

  The left articulator 10A includes a lock mechanism 50 (see FIG. 4C) that locks the rotation of the first arm 11 so that the upper back frame portion 4 moved from the lying position to the use position is fixed to the use position. Furthermore, a lock release mechanism 51 for releasing the lock of the rotation of the first arm 11 by the lock mechanism 50 is provided.

  Next, the configuration of the lock mechanism 50 and the lock release mechanism 51 of the left joint device 10A will be described below.

  As shown in FIGS. 6A and 6B, the pivot pin 30 is composed of a rivet with a head 33 as described above. Therefore, the pivot pin 30 has a shaft portion 31 having a circular cross section and a head portion 33 having a larger diameter than the shaft portion 31. The head portion 33 is formed integrally with the proximal end of the shaft portion 31.

  As shown in FIG. 4C, the pivot pin 30 is inserted in the second engagement hole 26, the first engagement hole 16, the first shaft hole 15, and the second shaft hole 25 as described above. The distal end portion 35 side of the pivot pin 30 as one end portion side (specifically, the distal end portion 35 side of the shaft portion 31 of the pivot pin 30) is the left connecting plate portion of the second arm 21 as the outer surface of the second arm 21. 23 is arranged so as to protrude to the left outer side than the left outer surface 23a. And the compression coil spring 39 as an urging | biasing member is extrapolated by the protrusion part 34 of the pivot pin 30 protruded to the left outer side rather than the said left outer surface 23a.

  Further, the distal end portion 35 of the shaft portion 31 of the pivot pin 30 is inserted inside an annular plate-shaped spring stopper member 38 made of a washer (detailed flat washer), and the distal end portion 35 is crimped in this state. As a result, the spring stopper 38 is fixed to the distal end portion 35 of the shaft portion 31 of the pivot pin 30 so as to be immovable in the axial direction of the pivot pin 30 (specifically, caulking is fixed in detail) to form a spring stopper. As a result, the compression coil spring 39 is inserted into the protruding portion 34 of the pivot pin 30 and the left outer side surface 23a of the left connecting plate portion 23 of the second arm 21 and the spring retaining member (the distal end portion 35 of the pivot pin 30). Between the spring stopper 38) and the spring stopper 38).

  Further, as shown in FIGS. 4C and 5, the pivot pin 30 is slidably disposed in the lock position (FIG. 4C) and the lock release position (FIG. 5) along the axial direction.

  As shown in FIG. 4C, the lock position is a position where the pivot pin 30 has moved in the left direction along the axial direction (that is, the left outward direction with respect to the backrest portion 3A).

  As shown in FIG. 5, the unlocking position is a position where the pivot pin 30 is moved rightward (that is, inward with respect to the backrest portion 3A) along the axial direction.

  As shown in FIG. 4C, the head 33 of the pivot pin 30 is in contact with the right outer surface 24 a of the right connecting plate portion 24 of the second arm 21 in the locked position. As a result, when the pivot pin 30 moves from the unlocked position (FIG. 5) to the locked position (FIG. 4C), the head 33 of the pivot pin 30 contacts the right outer surface 24a of the right connecting plate portion 24 of the second arm 21. The movement of the pivot pin 30 is stopped by contact, that is, the pivot pin 30 that has moved from the unlocked position to the locked position is stopped at the locked position.

  The head 33 of the pivot pin 30 functions as a stopper portion that stops the movement of the pivot pin 30 when the pivot pin 30 moves from the unlocked position (FIG. 5) to the locked position (FIG. 4C).

  As shown in FIGS. 4C and 5, the first shaft hole 15 of the left connecting plate portion 13 of the first arm 11 and the second arm 21 are in a state where the pivot pin 30 is disposed at the lock position and the unlock position, respectively. The corresponding portion of the shaft portion 31 of the pivot pin 30 corresponding to the second shaft hole 25 of the left connecting plate portion 23 is formed in a circular cross section (see FIGS. 6A and 6B). The cross-sectional shapes of the first and second shaft holes 15 and 25 are circular as described above. Therefore, the cross-sectional shapes of the first and second shaft holes 15 and 25 are formed in a shape that can rotate with respect to the shaft portion 31 of the pivot pin 30 in a state where the pivot pin 30 is disposed at the lock position and the unlock position, respectively. Has been.

  On the other hand, as shown in FIG. 4C, in the state where the pivot pin 30 is disposed at the locked position, the shaft portion 31 of the pivot pin 30 corresponding to the first engagement hole 16 of the right connecting plate portion 14 of the first arm 11. A non-circular portion 32 having a non-circular cross section is formed on the base end portion side (that is, the head portion 33 side) of the shaft portion 31 of the pivot pin 30 which is a corresponding portion.

  As shown in FIGS. 6A and 6B, the non-circular portion 32 of the pivot pin 30 is a lock that bulges on the proximal end side of the shaft portion 31 of the pivot pin 30 more radially outward than the outer peripheral surface thereof. The tooth portion 32a is provided to form a non-circular cross section. That is, the cross-sectional shape of the non-circular portion 32 is a shape that bulges radially outward from the shaft portion 31 of the pivot pin 30. In the first embodiment, the non-circular portion 32 has two lock tooth portions 32a and 32a bulged on both outer sides in the diameter direction of the shaft portion 31, and the cross-sectional shape of the non-circular portion 32 is substantially the same. It is rectangular. Further, each lock tooth portion 32 a is integrally formed on the proximal end side of the shaft portion 31 of the pivot pin 30. “32b” is an end face of the non-circular portion 32 (specifically, the lock tooth portion 32a) of the pivot pin 30.

  The cross-sectional shape of the first engagement hole 16 is formed such that the non-circular portion 32 of the pivot pin 30 can be fitted into the first engagement hole 16, and further fitted into the first engagement hole 16. The first engagement hole 16 is formed in a non-rotatable shape with respect to the non-circular shaped portion 32 formed. In the first embodiment, the cross-sectional shape of the first engagement hole 16 is formed in a shape corresponding to the cross-sectional shape of the non-circular portion 32. More specifically, the cross-sectional shape of the non-circular portion 32 is the same (that is, substantially the same). (Rectangular shape).

  Then, as shown in FIG. 4C, in a state where the pivot pin 30 is disposed at the lock position, the non-circular portion 32 of the pivot pin 30 is inserted in a state of being fitted (engaged) with the first engagement hole 16. Has been. Accordingly, the first arm 11 is disposed so as not to rotate with respect to the pivot pin 30.

  Furthermore, as shown in the figure, the non-circular portion 32 of the pivot pin 30 is inserted into the second engagement hole 26 of the right connecting plate portion 24 of the second arm 21 in a state where the pivot pin 30 is disposed at the locked position. It is inserted in a fitted (engaged) state.

  As shown in FIGS. 6A and 6B, the cross-sectional shape of the second engagement hole 26 is the same as the cross-sectional shape of the first engagement hole 16 (that is, a substantially rectangular shape). Thus, the pivot pin 30 is inserted and held in the second engagement hole 26 so as not to rotate with respect to the second engagement hole 26. Therefore, as shown in FIG. 4C, in a state where the pivot pin 30 is disposed at the locked position, the pivot pin 30 cannot rotate with respect to the second arm 21. 2 is attached to the engaging hole 26).

  Thus, in the state where the pivot pin 30 is disposed in the locked position, the pivot pin 30 cannot rotate with respect to the second arm 21 and the first arm 11 cannot rotate with respect to the pivot pin 30. The rotation of the first arm 11 with respect to the second arm 21 is locked.

  On the other hand, as shown in FIG. 5, in a state where the pivot pin 30 is disposed at the unlock position, the non-circular portion 32 of the pivot pin 30 is the first engagement hole of the right connecting plate portion 14 of the first arm 11. 16 is extracted from the second arm 21 to the second engagement hole 26 side, and is not extracted from the second engagement hole 26 of the second arm 21, that is, fitted into the second engagement hole 26. ing. Thus, in the state where the non-circular portion 32 is extracted from the first engagement hole 16, the shaft portion 31 having a circular cross section of the pivot pin 30 is disposed in the first engagement hole 16, thereby The first engagement hole 16 is rotatable with respect to the pivot pin 30 (specifically, its shaft portion 31), that is, functions as a shaft hole.

  Therefore, even when the pivot pin 30 is disposed in the unlocked position, the pivot pin 30 is still unrotatable with respect to the second arm 21 (more specifically, the second engagement hole 26 of the second arm 21). However, the first arm 11 is rotatable with respect to the pivot pin 30 by extracting the non-circular portion 32 of the pivot pin 30 from the first engagement hole 16. Accordingly, the rotation lock of the first arm 11 with respect to the second arm 21 is released.

  Next, operation | movement and the usage method of 1 A of seat chairs of this 1st Embodiment are demonstrated below.

  Here, as shown in FIG. 4A, for convenience of explanation, the rotational direction in which the deployment angle θ of the first arm 11 with respect to the second arm 21 of the left joint device 10A decreases is referred to as “the X direction of the (first arm 11)”, The rotation direction in which the deployment angle θ of the first arm 11 with respect to the second arm 21 increases is defined as “the Y direction (of the first arm 11)”.

  In the seat chair 1A shown in FIG. 1, the upper back frame portion 4 and the lower back frame portion 5 of the back frame 3 are arranged at a rising position used as the backrest portion 3A, that is, a use position. Furthermore, the deployment angle α of the back frame 3 (backrest portion 3A) with respect to the seat frame 2 (seat portion 2A) is held by both angle adjusters 9, 9. In the figure, the deployment angle α of the back frame 3 is about 95 °, and the back frame 3 is arranged in a rising shape with respect to the seat frame 2.

  In the state shown in FIG. 1, the left articulator 10 </ b> A has a maximum deployment angle of about 180 ° with respect to the second arm 21, as shown in FIGS. 4A to 4C. It has become. The movement of the upper back frame portion 4 toward the lying down position at this deployment angle θ is locked by the lock mechanism 50 of the left joint device 10A.

  That is, as shown in FIG. 4C, the pivot pin 30 of the left articulator 10 </ b> A is disposed in the locked position, and thus the non-circular portion 32 of the pivot pin 30 is the first of the right connecting plate portion 14 of the first arm 11. The engagement hole 16 is fitted (engaged) with the second engagement hole 26 of the right connecting plate portion 24 of the second arm 21. As a result, the pivot pin 30 cannot rotate with respect to the second arm 21 and the first arm 11 cannot rotate with respect to the pivot pin 30, and as a result, the first arm 11 does not rotate with respect to the second arm 21. The rotation is locked.

  Further, in this locked state, the pivot pin 30 is configured such that the head 33 of the pivot pin 30 abuts against the right outer surface 24 a of the right connecting plate portion 24 of the second arm 21 against the urging force of the compression coil spring 39. It is held in the locked position.

  Further, in this locked state, in the left joint device 10A, the first arm 11 is in contact with the first stopper portion 27 (see FIG. 6B) provided on the second arm 21, whereby the first arm 11 is The deployment angle θ of the first arm 11 is restricted from rotating in a direction (Y direction) that increases from about 180 °, and the deployment angle of the first arm 11 is also controlled by the same mechanism in the right articulator 60. It is restricted from rotating in a direction (Y direction) in which θ increases from about 180 °.

  When the upper back frame portion 4 of the back frame 3 is moved from the use position (FIG. 1) to the lying position (FIG. 2), as shown in FIG. 5, the rotation lock of the first arm 11 of the left joint device 10A is locked. Perform the unlocking operation to release.

  That is, as shown in the figure, the cushion for the backrest portion 3A is used by one finger (not shown) of the unlocking operator (eg, packing operator, storage operator, storage operator for the seat chair 1A). By pushing the distal end portion 35 of the pivot pin 30 from the left outer side of the body 7 to the right (in the direction of the arrow M) against the urging force of the compression coil spring 39, the pivot pin 30 is slid from the locked position to the unlocked position. The non-circular portion 32 of the pivot pin 30 is extracted from the first engagement hole 16. Thereby, the 1st arm 11 becomes rotatable with respect to the pivot pin 30, and the lock | rock of the rotation of the 1st arm 11 with respect to the 2nd arm 21 is cancelled | released.

  Further, the movement of the pivot pin 30 from the locked position to the unlocked position compresses the compression coil spring 39 and increases the urging force of the compression coil spring 39.

  In this unlocking operation, when the pivot pin 30 moves from the locked position to the unlocked position, the compression coil spring 39 is sandwiched between the left outer surface 23a of the left connecting plate portion 23 of the second arm 21 and the spring retaining member 38. By this, it will be in a close_contact | adherence state (namely, the state which the coil parts of the compression coil spring 39 contact | adhered), and the movement of the pivot pin 30 is stopped by this. Therefore, the pivot pin 30 is stopped at the unlocked position.

  Then, with the other hand of the unlocking operator pushing the tip 35 of the pivot pin 30 with one finger of the unlocking operator and placing the pivot pin 30 at the unlocking position, The upper frame 4 is moved from the use position to the lying position side. 7A to 7C, the first arm 11 of the left joint device 10A is moved around the pivot pin 30 (specifically, the shaft portion 31 of the pivot pin 30). While rotating in the X direction with respect to the arm 21 and the pivot pin 30, the first arm 61 of the right articulator 60 is similarly rotated.

  Thus, when the 1st arm 11 of 10 A of left articulators rotates to a X direction, as shown to FIG. 7C, the end surface 32b of the non-circular shaped part 32 (specifically, locking tooth part 32a) of the pivot pin 30 becomes The first arm 11 is in contact with the right outer surface 14a of the right connecting plate portion 14 and is locked to the right outer surface 14a, and the end surface 32b of the non-circular portion 32 is in contact with the right outer surface 14a. The pivot pin 30 is held at the unlocked position against the urging force of the compression coil spring 39. Accordingly, by moving the upper back frame portion 4 from the use position to the lying down position side, the pivot pin 30 is held at the unlock position even if the unlocking operator moves his / her finger away from the distal end portion 35 of the pivot pin 30.

  When the upper back frame portion 4 moved from the use position to the lying down position reaches the lying down position, as shown in FIGS. 2 and 3, the corresponding portion of the upper back frame portion 4 in the backrest portion 3A is the seating surface of the seat portion 2A. The movement of the upper back frame portion 4 is stopped in contact with 2Aa. Accordingly, the upper back frame portion 4 is arranged substantially parallel to the seat frame 2, and the corresponding portion of the upper back frame portion 4 in the backrest portion 3A overlaps the seat portion 2A substantially parallel to the seat portion 2A. As described above, the seat chair 1A is folded in a double fold shape to form a compact state.

  Even in this folded state, as shown in FIGS. 8A and 8B, the end surface 32b of the non-circular portion 32 of the pivot pin 30 of the left joint device 10A still remains on the right outer surface 14a of the right connecting plate portion 14 of the first arm 11. The pivot pin 30 is held in the unlocked position by contacting the right outer surface 14a.

  When the seat chair 1A is transported for shipment from the manufacturing factory, the seat chair 1A is placed in the packing box 80 as shown in FIG. Is done. Further, when the seat 1A is stored and stored, the seat 1A can be stored and stored in such a folded state.

  As shown in FIG. 8A, a second stopper portion 28 is provided on the second arm 21 of the left articulator 10A. The second stopper portion 28 contacts the first arm 11 when the upper back frame portion 4 moved from the use position moves excessively downward (X direction) beyond the lying position, and the upper back frame portion 4 The movement of the (first arm 11) is stopped. Also in the right articulator 60, the same second stopper portion is provided on the second arm 62.

  When the seat 1A is used, first, the folded seat 1A is taken out from the packing box 80 shown in FIG. 3, and the back frame 3 is gripped by the upper part of the backrest 3A of the seat 1A. The upper back frame 4 is moved from the lying down position to the use position side. At this time, since the pivot pin 30 of the left articulator 10A is held in the unlocked position as described above (see FIG. 8B), the upper back frame portion 4 is movable.

  As shown in FIGS. 7A to 7C, the first arm 11 of the left articulator 10 </ b> A moves to the pivot pin 30 (more specifically, the shaft portion 31 of the pivot pin 30 by the movement of the upper back frame portion 4 from the lying position to the use position. ) With respect to the second arm 11 and the pivot pin 30 in the Y direction, and the first arm 61 of the right joint device 60 also rotates in the same manner.

  As shown in FIG. 1, when the upper back frame portion 4 is moved to the use position, the end surface 32 b of the non-circular portion 32 of the pivot pin 30 of the left joint device 10 </ b> A is No contact with the right outer surface 14a (see FIG. 7C), that is, the locking of the end surface 32b of the non-circular portion 32 to the right outer surface 14a is released, and the pivot pin 30 is automatically moved by the biasing force of the compression coil spring 39. Move from the unlocked position to the locked position. As a result, as shown in FIGS. 4A to 4C, the non-circular portion 32 of the pivot pin 30 is fitted into the first engagement hole 16 of the right connecting plate portion 14 of the first arm 11 to rotate the first arm 11. Is locked. As a result, the deployment angle θ of the first arm 11 with respect to the second arm 21 is held (fixed) at about 180 °. That is, the upper back frame portion 4 is fixed at the use position so as not to rotate with respect to the lower back frame portion 5.

  The seat chair 1A of the first embodiment has the following advantages.

  The left articulator 10A of the seat chair 1A has a first arm 11 which is a second arm so that the upper back frame portion 4 of the back frame 3 can move from a lying position to a use position with respect to the lower back frame portion 5. 21 is pivotally mounted so as to be relatively rotatable. Accordingly, when the seat chair 1A is transported, the seat chair 1A is placed in a compact folded state as shown in FIGS. 2 and 3 by arranging the upper back frame portion 4 of the back frame 3 in the lying position. Can do. Therefore, it is possible to reduce the transport cost of the seat 1A. Furthermore, when the seat 1A is stored and stored, the seat 1A can be stored and stored in such a folded state, so that the space for storing and storing the seat 1A can be saved. be able to.

  Further, since the left articulator 10A includes the lock mechanism 50, when the seat chair 1A is used, the upper arm frame 4 is moved from the lying position to the use position and the second arm 21 is rotated by the lock mechanism 50. The upper back frame 4 can be fixed at the use position by locking.

  And since the upper back frame part 4 can be fixed to a use position, the seat chair 1A has the following advantages further.

  That is, as shown in FIG. 1, when adjusting the deployment angle α of the back frame 3 (backrest portion 3A) with respect to the seat portion 2A (seat frame 2) by the two angle adjusters 9, 9, When the upper back frame 4 is not fixed at the use position, the upper back frame 4 is inadvertently moved to the lying down position when the upper part of the backrest 3A is gripped and adjusted. It becomes difficult to work. In addition, when the upper back frame portion 4 is not fixed, the left and right angle adjusters 9 and 9 are used as the restricting stages of both angle adjusters 9 and 9 that restrict the back frame 3 to the deployment angle α. 9 is easily different. If they are different, the load of the seated person sitting on the seat chair 1A is excessively applied to only one of the angle adjusters 9, 9, and as a result, The angle adjuster 9 is likely to break down.

  On the other hand, since the seat chair 1A of the first embodiment can fix the upper back frame portion 4 to the use position, the backrest is required when adjusting the deployment angle α of the back frame 3 (backrest portion 3A). Even if the upper part of the part 3A is grasped and the adjustment work is performed, the occurrence of the above-described problems can be suppressed.

  Further, since the left articulator 10A includes the lock release mechanism 51, even after the upper back frame portion 4 is fixed at the use position, the upper back frame portion 4 is unlocked by releasing the lock of the rotation of the first arm 11. Can be placed in the lying position, and the seat 1A can be folded again.

  Further, the lock mechanism 50 is configured such that the rotation of the first arm 11 is locked by the pivot pin 30 moving from the unlock position to the lock position, and the unlock mechanism 51 is configured such that the pivot pin 30 is locked. The rotation of the first arm 11 is unlocked by moving from the position to the lock release position. Thereby, the lock mechanism 50 and the lock release mechanism 51 can be simplified, and the lock operation and the lock release operation can be performed with a simple operation.

  Furthermore, the lock mechanism 50 is configured such that the rotation of the first arm 11 is locked by fitting the non-circular portion 32 of the pivot pin 30 into the first engagement hole 16 of the first arm 11. The lock release mechanism 51 is configured so that the rotation lock of the first arm 11 is released when the non-circular portion 32 of the pivot pin 30 is extracted from the first engagement hole 16. Thereby, simplification of the lock mechanism 50 and the lock release mechanism 51 can be achieved reliably.

  Furthermore, since the cross-sectional shape of the non-circular portion 32 of the pivot pin 30 is substantially rectangular, the movable range from the use position to the seat portion 2A side of the upper back frame portion 4 can be set to about 180 °. . Thereby, 1 A of seat chairs can be reliably made into the folding state mentioned above.

  Further, the pivot pin 30 is configured so that the non-circular portion 32 is inserted into the second engagement hole 26 in a fitted state so that the pivot pin 30 cannot rotate with respect to the second arm 21 (detailed). Then, since it is attached to the second engagement hole 26) of the second arm 21, it is possible to simplify the attachment structure between the pivot pin 30 and the second arm 21.

  Further, the lock mechanism 50 is configured to resist the urging force of the compression coil spring 39 as the urging member from the time when the upper back frame portion 4 is moved from the use position to the lying position side to when the upper frame portion 4 is arranged at the lying position. The pivot pin 30 is moved from the unlocked position to the locked position by the biasing force of the compression coil spring 39 when the upper back frame portion 4 that has been moved from the used position is placed in the used position. It is configured as follows. Thereby, the locking operation can be easily performed.

  Furthermore, the unlocking mechanism 51 is configured such that the movement of the pivot pin 30 is stopped when the pivot pin 30 is moved from the locked position to the unlocked position. Thereby, the pivot pin 30 can be reliably stopped at the unlocked position.

  Furthermore, since the pivot pin 30 is moved from the unlocked position to the locked position by the biasing force of the compression coil spring 39, the locking operation can be performed more easily.

  In addition, when the pivot pin 30 moves from the lock position to the unlock position, the movement of the pivot pin 30 is stopped by the close contact of the compression coil spring 39, so that the pivot pin 30 is reliably moved to the unlock position by the compression coil spring 39. Can be stopped.

  In this way, the compression coil spring 39 has two roles of a biasing member that moves the pivot pin 30 from the unlocked position to the locked position and a movement stop member that stops the movement of the pivot pin 30. Thereby, the number of parts of the left joint device 10A can be reduced.

  Further, the lock release mechanism 51 is configured so that the rotation lock of the first arm 11 is released when the distal end portion (one end portion) 35 of the pivot pin 30 is pushed. Thereby, the unlocking operation can be performed more easily.

  9A to 10 are diagrams for explaining a second embodiment of the present invention. In these drawings, the same reference numerals are given to elements equivalent to the elements of the left articulator 10A of the seat chair 1A of the first embodiment.

  In the left joint device 10B of the seat chair according to the second embodiment, as shown in FIGS. 9A and 9B, the distal end portion (one end portion) 35 of the pivot pin 30 has a cap shape (in detail, a bottomed cylindrical shape). A cover 40 is attached so as to cover the distal end portion 35 and the spring stopper member 38 of the pivot pin 30 from the outside. Furthermore, the cover 49 covers more than half of the compression coil spring 39 from the outside. The cover 40 is made of synthetic resin.

  Further, as shown in FIG. 9B, a plurality of retaining projections 40b are formed on the inner peripheral surface of the cover 40 at intervals in the circumferential direction. A spring retaining member 38 is sandwiched between the convex portions 40 b and the bottom surface of the cover 40, whereby the cover 40 is fixed and attached to the distal end portion 35 of the pivot pin 30.

  Other configurations of the left joint device 10B are the same as those of the left joint device 10A of the first embodiment.

  In the left joint device 10B of the seat chair of the second embodiment, in the left joint device 10B in the state of FIGS. 9A and 9B, the unlocking operator compresses the distal end portion 35 of the pivot pin 30 from the outside of the cover 40 with a finger. The pivot pin 30 is moved rightward (in the direction of arrow M, see FIG. 10) against the urging force of the coil spring 39 to move the pivot pin 30 from the locked position to the unlocked position. The non-circular portion 32 is extracted from the first engagement hole 16 of the first arm 11. Accordingly, the first arm 11 can be rotated with respect to the pivot pin 30 (specifically, the shaft portion 31 of the pivot pin 30), and the lock of the rotation of the first arm 11 with respect to the second arm 21 is released.

  Further, the movement of the pivot pin 30 from the locked position to the unlocked position compresses the compression coil spring 39 and increases the urging force of the compression coil spring 39.

  In this unlocking operation, as shown in FIG. 10, when the pivot pin 30 moves from the locked position to the unlocked position, the open end 40 a of the cover 40 is moved to the left outer surface 23 a of the left connecting plate 23 of the second arm 21. This stops the movement of the pivot pin 30. In addition, the compression coil spring 39 comes into close contact, and this also stops the movement of the pivot pin 30. Therefore, the pivot pin 30 is reliably stopped at the unlocked position.

  The configurations of the other lock mechanisms 50 and unlock mechanisms 51 of the left joint device 10B are the same as those of the left joint device 10A of the first embodiment.

  In the left joint device 10B of the seat chair of the second embodiment, the cover 40 is attached to the tip portion 35 of the pivot pin 30 so as to cover the tip portion 35 and the spring stopper member 38. Pain felt when pressing the distal end portion 35 of the pivot pin 30 with a finger or the like can be alleviated, and the cushion is caused by contact between the distal end portion 35 of the pivot pin 30 and the backrest portion 3A cushion body 7 (see FIG. 1). Damage to the body 7 can be suppressed.

  Further, when the pivot pin 30 is moved from the locked position to the unlocked position, the opening end portion 40a of the cover 40 abuts on the left outer surface 23a of the left connecting plate portion 23 of the second arm 21, whereby the pivot pin 30 is moved. Since it is stopped, the pivot pin 30 can be reliably stopped at the unlocked position by the cover 40.

  Thus, the cover 40 has three roles: a pain relieving member that relieves pain of the unlocking operator, a damage suppressing member that suppresses damage to the cushion body 7, and a movement stopping member that stops the movement of the pivot pin 30. have. Thereby, the number of parts of the left joint device 10B can be reduced.

  11A to 12 are diagrams illustrating a third embodiment of the present invention. In these drawings, elements equivalent to those of the left joint device 10A of the seat chair of the first embodiment are denoted by the same reference numerals.

  In the left joint device 10C of the seat chair of the third embodiment, as shown in FIGS. 11A and 11B, the distal end portion (one end portion) 35 of the pivot pin 30 has a smaller diameter than the protruding portion 34 of the pivot pin 30. It is formed with.

  “41” is a push button member. The push button member 41 is made of synthetic resin and has a substantially cylindrical shape or a substantially hemispherical shape. Further, a metal nut 42 is embedded in the push button member 41 in a fixed state. The distal end portion (male thread portion) 35 of the pivot pin 30 is inserted into the spring retaining member 38 and the nut 42 is screwed to the distal end portion 35, whereby the push button member 41 is fitted to the distal end portion 35 of the pivot pin 30. Is attached so as to cover the tip portion 35. Further, a spring stopper member 38 is clamped and fixed between a step portion 34a formed at the end portion 35 side end of the protruding portion 34 of the pivot pin 30 and a push button member 41 (more specifically, a nut 42). Yes.

  Further, it is a gap between the outer peripheral surface of the projecting portion 34 of the pivot pin 30 and the compression coil spring 39 extrapolated to the projecting portion 34 and pushes against the left outer surface 23 a of the left connecting plate portion 23 of the second arm 21. A cylindrical ring-shaped movement stop member 43 is arranged between the button member 41 (more specifically, the spring stopper member 38) in an extrapolated shape and a loosely inserted shape with respect to the protruding portion 34. The movement stop member 43 is made of metal having high rigidity, and stops the movement of the pivot pin 30 when the pivot pin 30 moves from the lock position to the lock release position.

  Other configurations of the left joint device 10C are the same as those of the left joint device 10A of the first embodiment.

  In the left joint device 10C of the seat chair of the third embodiment, in the left joint device 10C in the state of FIGS. 11A and 11B, the unlocking operator compresses the push button member 41 of the distal end portion 35 of the pivot pin 30 with fingers. The pivot pin 30 is moved rightward (in the direction of arrow M, see FIG. 12) against the urging force of the coil spring 39 to move the pivot pin 30 from the locked position to the unlocked position. The non-circular portion 32 is extracted from the first engagement hole 16 of the first arm 11. Accordingly, the first arm 11 can be rotated with respect to the pivot pin 30 (specifically, the shaft portion 31 of the pivot pin 30), and the lock of the rotation of the first arm 11 with respect to the second arm 21 is released.

  Further, the movement of the pivot pin 30 from the locked position to the unlocked position compresses the compression coil spring 39 and increases the urging force of the compression coil spring 39.

  In this unlocking operation, when the pivot pin 30 moves from the locked position to the unlocked position, the left outer surface 23a of the left connecting plate portion 23 of the second arm 21 and the push button member 41 (specifically, the spring stopper member 38). The movement stopping member 43 is sandwiched between the pivot pin 30 and the movement of the pivot pin 30. In addition, at this time, the compression coil spring 39 is brought into a close contact state, and this also stops the movement of the pivot pin 30. Therefore, the pivot pin 30 is reliably stopped at the unlocked position.

  The configurations of the other lock mechanisms 50 and unlock mechanisms 51 of the left joint device 10C are the same as those of the left joint device 10A of the first embodiment.

  In the left joint device 10C of the seat chair of the third embodiment, the push button member 41 is attached to the tip portion 35 of the pivot pin 30 so as to cover the tip portion 35. The pain felt when the distal end portion 35 of the pivot pin 30 is pushed can be relieved, and the cushion body 7 is brought into contact with the distal end portion 35 of the pivot pin 30 and the cushion member 7 for the backrest portion 3A (see FIG. 1). Damage can be suppressed.

  Further, when the pivot pin 30 is moved from the lock position to the lock release position, the movement stop member 43 is disposed between the left outer surface 23a of the left connecting plate portion 23 of the second arm 21 and the push button member 41 (spring retaining member 38). Since the movement of the pivot pin 30 is stopped by being pinched, the pivot pin 30 can be reliably stopped at the unlocked position by the movement stop member 43.

  Further, the spring retaining member 38 is not caulked and fixed to the distal end portion 35 of the pivot pin 30, but is fixed by being sandwiched between the step portion 34 a of the protruding portion 34 of the pivot pin 30 and the push button member 41. Therefore, the fixing work of the spring stopper member 38 can be easily performed.

  FIG. 13 is a diagram for explaining a fourth embodiment of the present invention. In these drawings, elements equivalent to those of the left joint device 10A of the seat chair of the first embodiment are denoted by the same reference numerals.

  In the left joint device 10D of the seat chair of the fourth embodiment, the pivot corresponding to the first engagement hole 16 of the right connecting plate portion 14 of the first arm 11 in a state where the pivot pin 30 is disposed at the lock position. On the base end side (the head 33 side) of the shaft portion 31 of the pivot pin 30, which is a corresponding portion of the shaft portion 31 of the pin 30, the radially outer portion of the outer peripheral surface is locally radially outward. The bulging lock tooth portion 32a is integrally formed, and thereby a non-circular portion 32 having a non-circular cross section is formed.

  The cross-sectional shape of the first engagement hole 16 is formed in a shape corresponding to the cross-sectional shape of the non-circular portion 32 of the pivot pin 30. Is formed.

  The cross-sectional shape of the second engagement hole 26 of the right connecting plate portion 24 of the second arm 21 is formed in the same shape and the same size as the cross-sectional shape of the first engagement hole 16.

  Other configurations of the left joint device 10D are the same as those of the left joint device 10A of the first embodiment. The configurations of the lock mechanism 50 and the lock release mechanism 51 of the left joint device 10D are the same as those of the left joint device 10A of the first embodiment.

  14A to 17B are views for explaining a fifth embodiment of the present invention. In these drawings, elements equivalent to those of the left joint device 10A of the seat chair of the first embodiment are denoted by the same reference numerals. Hereinafter, the configuration of the left articulator 10E of the seat chair of the fifth embodiment will be described below with a focus on differences from the left articulator 10A of the seat chair of the first embodiment.

  In the left articulator 10E of the seat chair of the fifth embodiment, as shown in FIGS. 14A, 14B, and 16A, the pivot pin 30E is not from the right outer side of the right connecting plate portion 24 of the second arm 21, but the second articulator 10E. From the left outer side of the left connecting plate portion 23 of the arm 21, the second shaft hole 25 of the left connecting plate portion 23 of the second arm 21, the first shaft hole 15 of the left connecting plate portion 13 of the first arm 11, and the first arm. 11 is connected to the first engagement hole 16 of the right connection plate portion 14 and the second engagement hole 26 of the right connection plate portion 24 of the second arm 21 sequentially, and slides along the axial direction of the pivot pin 30E. It is inserted as possible.

  In FIGS. 16A and 16B, “55” is a stopper member with lock teeth 32a and 32a formed separately from the pivot pin 30E. The stopper member 55 is an annular member having an insertion hole 56 having a circular cross section through which the distal end portion 35 of the shaft portion 31 of the pivot pin 30E is inserted. Specifically, the stopper member 55 has an annular plate shape. The two lock tooth portions 32a and 32a are formed integrally with the stopper member 55 in a state of being spaced apart from each other. The stopper member 55 is made of metal, and more specifically, a metal sintered product.

  Then, as shown in FIG. 14B, the distal end portion 35 of the shaft portion 31 of the pivot pin 30E is inserted into the insertion hole 56 of the stopper member 55, and the distal end portion 35 is caulked in this state, whereby the pivot pin 30E A stopper member 55 is fixed to the tip portion 35 of the shaft portion 31 so as not to move in the axial direction of the pivot pin 30E and to the shaft portion 31 of the pivot pin 30E so as to be non-rotatable (specifically, caulking is fixed). As a result, the lock teeth 32a and 32a are fixedly disposed on the outer peripheral surface of the predetermined portion of the shaft portion 31 of the pivot pin 30E, and the non-circular portion having a non-circular cross section is formed at the predetermined portion of the shaft portion 31 of the pivot pin 30E. 32 is formed.

  The cross-sectional shape of the first engagement hole 16 is formed in a shape corresponding to the cross-sectional shape of the non-circular portion 32 of the pivot pin 30E as shown in FIG. It is formed in the same shape and size as the shape.

  The cross-sectional shape of the second engagement hole 26 of the right connecting plate portion 24 of the second arm 21 is formed in the same shape and the same size as the cross-sectional shape of the first engagement hole 16.

  As shown in FIGS. 14A and 14B, in the state where the pivot pin 30E is disposed at the lock position, the base end portion (head 33) side of the shaft portion 31 of the pivot pin 30E is the left connecting plate of the second arm 21. The portion 23 is disposed so as to protrude to the left outer side than the left outer surface 23a. And the compression coil spring 39 as an urging member is extrapolated to the protrusion part 34 of the pivot pin 30E that protrudes to the left outer side from the left outer surface 23a, and in this state, the left connecting plate part 23 of the second arm 21 It arrange | positions in the compression state between the left outer surface 23a and the head 33 of the pivot pin 30E. That is, the head 33 of the pivot pin 30E functions as a spring stopper.

  Furthermore, in a state where the pivot pin 30E is disposed at the lock position, the stopper member 55 (specifically, the portions 55a and 55a between the lock tooth portions 32a and 32a of the stopper member 55) is connected to the right side of the second arm 21. It contacts the right outer surface 24a of the plate portion 24 (see FIGS. 14A and 16B). Accordingly, when the pivot pin 30E is moved from the unlocked position (FIG. 15) to the locked position (FIG. 14B), the stopper member 55 comes into contact with the right outer surface 24a of the right connecting plate portion 24 of the second arm 21, thereby pivoting. The movement of the pin 30E is stopped, that is, the pivot pin 30E that has moved from the unlocked position to the locked position is stopped at the locked position.

  Further, in a state where the pivot pin 30E is disposed at the locked position, the non-circular portion 32 of the pivot pin 30E is fitted (engaged) with the first engagement hole 16 of the right connecting plate portion 14 of the first arm 11. It is inserted in the state where it is fitted, and is further fitted (engaged) in the second engagement hole 26 of the right connecting plate portion 24 of the second arm 21. Therefore, the pivot pin 30E cannot rotate with respect to the second arm 21, and the first arm 11 cannot rotate with respect to the pivot pin 30 (specifically, the shaft portion 31 of the pivot pin 30). Therefore, the rotation of the first arm 11 with respect to the second arm 21 is locked.

  Further, in this locked state, the pivot pin 30E is held in the locked position by the stopper member 55 abutting against the right outer surface 24a of the right connecting plate portion 24 of the second arm 21 against the urging force of the compression coil spring 39. Has been.

  As shown in FIG. 15, in a state where the pivot pin 30E is disposed at the unlock position, the non-circular portion 32 of the pivot pin 30E is pulled out from the first engagement hole 16 to the second engagement hole 26 side. Thus, the first engagement hole 16 is rotatable with respect to the pivot pin 30E (specifically, the shaft portion 31 of the pivot pin 30), that is, functions as a shaft hole. On the other hand, the non-circular portion 32 of the pivot pin 30 </ b> E is not extracted from the second engagement hole 26, that is, is fitted in the second engagement hole 26. Therefore, the pivot pin 30E is still unrotatable with respect to the second arm 21, and the first arm 11 is rotatable with respect to the pivot pin 30E (the shaft portion 31 of the pivot pin 30E). Therefore, the rotation lock of the first arm 11 with respect to the second arm 21 is released.

  When the upper back frame portion 4 of the back frame 3 is moved from the use position (FIG. 1) to the lying position (FIG. 2), as shown in FIG. 15, the head 33 that is the base end portion of the pivot pin 30E is moved. The non-circular portion 32 of the pivot pin 30E is first engaged by pushing the right side (in the direction of arrow M) against the biasing force of the compression coil spring 39 to move the pivot pin 30E from the locked position to the unlocked position. It is extracted from the hole 16. Accordingly, the first arm 11 can rotate with respect to the pivot pin 30E (specifically, the shaft portion 31 of the pivot pin 30), and the lock of the rotation of the first arm 11 with respect to the second arm 21 is released.

  Further, the movement of the pivot pin 30E from the lock position to the lock release position compresses the compression coil spring 39, and the urging force of the compression coil spring 39 increases.

  In this unlocking operation, when the pivot pin 30E is moved from the locked position to the unlocked position, the compression coil spring 39 is located between the left outer surface 23a of the left connecting plate portion 23 of the second arm 21 and the head 33 of the pivot pin 30E. Is in a close contact state (that is, a state in which the coil portions of the compression coil spring 39 are in close contact with each other), whereby the movement of the pivot pin 30E is stopped. Therefore, the pivot pin 30E is stopped at the unlocked position.

  Then, the upper back frame portion 4 is moved from the use position to the lying down position side while the head 33 of the pivot pin 30E is pushed and the pivot pin 30E is disposed at the unlock position. By this movement of the upper back frame portion 4, as shown in FIGS. 17A and 17B, the first arm 11 of the left articulator 10A is centered around the pivot pin 30E (specifically, the shaft portion 31 of the pivot pin 30E). It rotates in the X direction with respect to the arm 21 and the pivot pin 30E.

  As the first arm 11 rotates in the X direction in this way, as shown in FIG. 17B, the end surface 32b of the non-circular portion 32 (specifically, the lock tooth portion 32a) of the pivot pin 30E is brought into contact with the first arm 11. The pivot pin 30 </ b> E is held in the unlocked position against the urging force of the compression coil spring 39 by contacting the right outer surface 14 a of the right connecting plate portion 14 and being locked to the right outer surface 14 a. Therefore, the pivot pin 30E is held at the unlocked position by moving the upper back frame portion 4 from the use position to the lying down position side.

  When the upper frame portion 4 of the back frame 3 is moved from the lying position (FIG. 2) to the use position (FIG. 1), the pivot pin 30E of the left joint device 10A is held at the unlocked position as described above. Therefore, the upper back frame part 4 is movable.

  Due to the movement of the upper back frame portion 4 from the lying down position to the use position, the first arm 11 of the left joint device 10A is moved around the pivot pin 30E (specifically, the shaft portion 31 of the pivot pin 30E) and the second arm 11 and It rotates in the Y direction with respect to the pivot pin 30E. Then, when the upper back frame portion 4 moves to the use position, the end surface 32b of the non-circular portion 32 of the pivot pin 30E of the left joint device 10A contacts the right outer surface 14a of the right connecting plate portion 14 of the first arm 11. In other words, the locking of the end surface 32b of the non-circular portion 32 to the right outer surface 14a is released, and the pivot pin 30E is automatically moved from the unlocked position to the locked position by the biasing force of the compression coil spring 39. Accordingly, as shown in FIG. 14B, the non-circular portion 32 of the pivot pin 30E is fitted into the first engagement hole 16 of the right connecting plate portion 14 of the first arm 11, and the rotation of the first arm 11 is locked. Is done. As a result, the deployment angle θ of the first arm 11 with respect to the second arm 21 is held (fixed) at about 180 °. That is, the upper back frame portion 4 is fixed at the use position so as not to rotate with respect to the lower back frame portion 5.

  In the left joint device 10E of the seat chair of the fifth embodiment, the lock tooth portion 32a formed separately from the pivot pin 30E is provided on the outer peripheral surface of the predetermined portion in the axial direction of the shaft portion 31 of the pivot pin 30E. Since the non-circular portion 32 is formed at a predetermined portion of the shaft portion 31 of the pivot pin 30E by being arranged in a fixed state, the non-circular portion 32 can be easily formed at a predetermined portion of the shaft portion 31 of the pivot pin 30E. Can be formed.

  Furthermore, since the lock tooth portion 32a is formed integrally with the stopper member 55, the lock tooth portion 32a can be easily attached to the shaft portion 31 of the pivot pin 30E.

  Further, when the pivot pin 30E is moved from the unlocked position to the locked position, the stopper member 55 comes into contact with the right outer surface 24a of the right connecting plate portion 24 of the second arm 21, so that the movement of the pivot pin 30E is stopped. The pivot pin 30E can be reliably stopped at the locked position.

  FIG. 18 is a diagram for explaining a sixth embodiment of the present invention. In these drawings, the same reference numerals are given to elements equivalent to the elements of the seat 1A of the first embodiment.

  The seat chair 1B of the sixth embodiment does not include the left and right angle adjusters (see FIG. 1: 9, 9). In addition, the lower back of the back frame 3 is formed of a portion bent in the rising shape by locally bending the both rear end portions 2aa of the left and right side frame portions 2a of the seat frame 2A in the rising shape. Both left and right lower frame portions 5a of the frame portion 5 are formed. And the lower end part of the upper left frame part 4a of the upper back frame part 4 and the upper end part of the lower left side frame part 5a of the lower back frame part 5 are connected via the left joint device 10A shown in the first embodiment. In addition, the lower end portion of the upper right frame portion of the upper back frame portion 4 and the upper end portion of the lower right frame portion of the lower back frame portion 5 are connected via a right articulator (not shown).

  The left joint device 10A includes the lock mechanism 50 and the lock release mechanism 51 described above. The right articulator does not include the lock mechanism 50 and the lock release mechanism 51 described above. For example, the right articulator 60 (see FIGS. 1 and 2) shown in the first embodiment is used.

  In the present invention, the left articulator 10A is not limited to that shown in the first embodiment, and for example, any of the left articulators 10B to 10E shown in the second to fifth embodiments. It may be.

  FIG. 19 is a diagram for explaining a seventh embodiment of the present invention.

  The furniture according to the seventh embodiment is a folding sofa 70. The sofa 70 is provided with a seat 72, a pair of left and right armrests 74, 74 as rising portions provided on both left and right ends of the seat 72, and a rear end of the seat 72. And a backrest portion 73 as a rising portion.

  Each armrest 74 has an armrest frame 75 as a rising frame. The armrest frame 75 is divided into an upper armrest frame portion 76 and a lower armrest frame portion 77 at an intermediate portion in the height direction.

  A cushion body (not shown) is attached to each of the upper armrest frame portion 76 and the lower armrest frame portion 77 so as to cover the entire frame portions. Both cushion bodies are integrally connected to each other. The upper armrest frame portion 76 is used when the upper armrest frame portion 76 is used as the armrest portion 74 from the lying position where the upper armrest frame portion 76 has fallen toward the seat portion 72 with respect to the rising lower armrest frame portion 77. The upper armrest frame portion 76 and the lower armrest frame portion 77 are connected via a pair of articulators 78 and 78 so as to be movable to each other.

  At least one of the articulators 78 and 78 includes the lock mechanism 50 and the lock release mechanism 51 described above.

  In the present invention, the sofa 70 according to the seventh embodiment is configured such that the backrest 73 can fall horizontally to the rear of the seat 72 so that the deployed angle of the backrest 73 with respect to the seat 72 is 180 °. Or / and the back frame of the backrest portion 73 is divided into an upper back frame portion and a lower back frame portion at an intermediate portion in the height direction, and the upper back frame portion, The lower back frame part may be connected via an articulator provided with the lock mechanism 50 and the lock release mechanism 51 described above.

  Although several embodiments of the present invention have been described above, the present invention is not limited to those shown in these embodiments.

  Further, in these embodiments, the left articulators 10A to 10E among the left and right articulators 10A to 10E and 60 include the lock mechanism 50 and the lock release mechanism 51. The device 60 may include the lock mechanism 50 and the lock release mechanism 51, or it does not exclude that each of the joint devices includes the lock mechanism 50 and the lock release mechanism 51.

  In addition, as shown in these embodiments, the first arm 11 of the first and second arms 11 and 21 of the joint devices 10A to 10E is attached to the upper back frame portion 4 of the back frame 3 and the second arm 21. Is preferably attached to the lower back frame portion 5 in that the pivot pin 30 does not rotate even when the upper back frame portion 4 is moved from the lying down position to the use position. For example, it does not exclude that the first arm 11 of the joint devices 10A to 10E is attached to the lower back frame portion 5 and the second arm 21 is attached to the upper back frame portion 4.

  The furniture according to the present invention may be configured by combining two or more technical features shown in these embodiments.

  Furthermore, the furniture according to the present invention is not limited to a seat chair and a sofa, but may be, for example, a reclining chair other than a seat chair or a chair other than a reclining chair. . Furthermore, in the present invention, it is not excluded that the chair is a chair used for various kinds of training such as training for improving muscular strength and training for fitness, and does not exclude furniture other than the chair. .

  The present invention can be used for furniture such as a chair (eg, reclining chair, sofa).

1A, 1B: Seat chair (furniture) 2A: Seat part (horizontal part)
2: Seat frame 3A: Backrest (rise part)
3: Back frame 4: Upper back frame (upper frame)
5: Lower back frame part (lower frame part) 10A to 10E: Left joint device 11: First arm 16: First engagement hole 21: Second arm 26: Second engagement hole 30, 30E: Axis pin 32: Non-circular portion 32a of pivot pin: Lock tooth portion 34: Projection portion 39 of pivot pin: Compression coil spring (biasing member) 40: Cover 50: Lock mechanism 51: Unlock mechanism 55: Stopper member with lock tooth portion

In the first arm 11, the left connecting plate portion 13 which is a connecting plate portion located outside the backrest portion 3A among the connecting plate portions 13 and 14 has a first shaft hole 15 (see FIG. 6A) is provided. A first engagement hole 16 (see FIG. 6B) having a non-circular cross section is formed in the right connection plate portion 14, which is a connection plate portion located inside the backrest portion 3 </ b> A among the connection plate portions 13 and 14. The right connecting plate portion 14 is provided so as to penetrate in the thickness direction . Details of the cross-sectional shape of the first engagement hole 16 will be described later.

Further, as shown in FIGS. 1 and 2, the first arm 11 has an upper back from a lying position (FIG. 2) where the upper back frame portion 4 has fallen to the seat portion 2 </ b> A side with respect to the lower back frame portion 5 in a standing state. Further, the upper back frame portion 4 is moved from the use position (FIG. 1) to the lying position (FIG. 1) so that the frame portion 4 can be moved to the use position (FIG. 1) disposed when the frame portion 4 is used as the backrest portion 3A. 2) It is pivotally attached to the second arm 21 via a pivot pin 30 so as to be rotatable relative to the second arm 21 so as to be movable to 2). Further, both connecting plate portions 13 and 14 of the first arm 11 are provided on the first arm 11 so as to be integrally rotatable.

On the other hand, as shown in FIG. 5, in a state where the pivot pin 30 is disposed at the unlock position, the non-circular portion 32 of the pivot pin 30 is the first engagement hole of the right connecting plate portion 14 of the first arm 11. 16 to the second engagement hole 26 side of the second arm 21, that is, to the right side as one side in the thickness direction of the right connecting plate portion 14 , and from the second engagement hole 26 of the second arm 21. In other words, the second engagement hole 26 is not extracted. Thus, in the state where the non-circular portion 32 is extracted from the first engagement hole 16, the shaft portion 31 having a circular cross section of the pivot pin 30 is disposed in the first engagement hole 16, thereby The first engagement hole 16 is rotatable with respect to the pivot pin 30 (specifically, its shaft portion 31), that is, functions as a shaft hole.

Then, the pivot pin 30 with one hand finger of the lock release operator by pressing the tip portion 35 in the state in which is disposed a pivot pin 30 in the unlocked position, the lock release operator other hand of the backrest portion 3A The upper back frame part 4 is moved from the use position to the lying down position side by grasping the upper part. 7A to 7C, the first arm 11 of the left joint device 10A is moved around the pivot pin 30 (specifically, the shaft portion 31 of the pivot pin 30). While rotating in the X direction with respect to the arm 21 and the pivot pin 30, the first arm 61 of the right articulator 60 is similarly rotated.

Further, the lock mechanism 50 is configured such that the end surface 23b of the non-circular portion 32 of the pivot pin 30 is the first arm from when the upper back frame portion 4 is moved from the use position to the lying position to when being placed at the lying position. 11, the pivot pin 30 is held at the unlocked position against the urging force of the compression coil spring 39 as the urging member and locked from the lying down position. When the moved upper back frame portion 4 is arranged at the use position, the end surface 32b of the non-circular portion 32 of the pivot pin 30 is locked to the right outer surface 14a of the right connecting plate portion 14 of the first arm 11. The pivot pin 30 is configured to move from the unlocked position to the locked position by the urging force of the compression coil spring 39 by releasing. Thereby, the locking operation can be easily performed.

Claims (13)

A horizontal portion arranged substantially horizontally; and a rising portion provided at the end of the horizontal portion so as to rise from the horizontal portion and having a rising frame;
The rising frame is divided into an upper frame portion and a lower frame portion at an intermediate portion in the height direction of the rising frame, and
The upper frame part and the lower frame part are connected via an articulator,
The articulator includes a first arm attached to one of the upper frame part and the lower frame part, and a second arm attached to the other,
The first arm is configured to move from a lying position where the upper frame portion has fallen to the horizontal portion side with respect to the lower frame portion to a use position that is arranged when the rising portion is used. The two arms are pivotally mounted so as to be rotatable relative to the second arm,
Furthermore, the articulator is a furniture provided with a lock mechanism that locks the rotation of the first arm so that the upper frame portion moved from the lying position to the use position is fixed to the use position.   The furniture according to claim 1, wherein the articulator includes a lock release mechanism that unlocks the rotation of the first arm by the lock mechanism. The first arm is pivotally attached to the second arm via a pivot pin;
The pivot pin is movable along the axial direction to a locked position and an unlocked position;
The locking mechanism is configured such that the rotation of the first arm is locked when the pivot pin is disposed at the locking position.
The furniture according to claim 2, wherein the lock release mechanism is configured such that the rotation of the first arm is unlocked when the pivot pin moves from the lock position to the lock release position. The pivot pin is inserted into a first engagement hole provided in the first arm so as to be movable from the locked position to the unlocked position.
Further, the pivot pin is provided on the second arm so as not to rotate with respect to the second arm when the pivot pin is disposed at the lock position and the unlock position, respectively.
A part of the pivot pin in the axial direction is provided with a non-circular portion having a non-circular cross section having a lock tooth portion bulging outward in the radial direction,
The cross-sectional shape of the first engagement hole is such that the non-circular portion of the pivot pin can be fitted into the first engagement hole and the non-circular portion fitted into the first engagement hole. On the other hand, the first engagement hole is formed in a non-rotatable shape,
In the locking mechanism, when the pivot pin is arranged at the lock position, the non-circular portion of the pivot pin is fitted into the first engagement hole, and the rotation of the first arm is locked. Is configured as
When the pivot pin moves from the lock position to the lock release position, the non-circular portion of the pivot pin is pulled out from the first engagement hole and the lock release mechanism is moved to the first arm. The furniture according to claim 3, wherein the furniture is configured to be unlocked.   On the outer peripheral surface of the part of the pivot pin in the axial direction, the lock tooth portion formed separately from the pivot pin is disposed in a fixed state, so that the part of the pivot pin in the axial direction of the pivot pin The furniture according to claim 4, wherein the non-circular portion is formed. The lock tooth portion is integrally formed with an annular stopper member having an insertion hole through which the pivot pin is inserted;
The stopper member is inserted into the insertion pin in the insertion hole so that the locking tooth portion is fixedly arranged on the part of the outer peripheral surface in the axial direction of the axis pin. Is fixed,
The lock mechanism is configured such that the movement of the pivot pin is stopped by the stopper member coming into contact with the outer surface of the second arm when the pivot pin moves from the unlocked position to the locked position. The furniture according to claim 5. The second arm has a second engagement hole,
The cross-sectional shape of the second engagement hole is the same as the cross-sectional shape of the first engagement hole,
The pivot pin is provided on the second arm so that the non-circular portion is not rotatable with respect to the second arm when the non-circular portion is inserted into the second engagement hole in a fitted state. The furniture according to any one of claims 4 to 6. The pivot pin is biased by a biasing member in a direction to move from the unlocked position to the locked position,
The locking mechanism is configured such that the pivot pin is held at the unlocked position against the urging force of the urging member when the upper frame part is arranged at the lying position, and the upper frame part is used at the use position. The furniture according to any one of claims 3 to 7, wherein the pivot pin is configured to move from the unlocked position to the locked position by an urging force of the urging member when arranged in a position.   The furniture according to any one of claims 3 to 8, wherein the lock release mechanism is configured to stop the movement of the pivot pin when the pivot pin moves from the lock position to the lock release position. One end portion side of the pivot pin is arranged to protrude outward from the outer surface of the first or second arm,
The pivot pin is extrapolated to a projecting portion of the pivot pin that projects outward from the outer surface of the first or second arm, and is disposed between the outer surface and the one end of the pivot pin. A compression coil spring as a biasing member is elastically biased in the direction of moving from the unlocked position to the locked position,
The lock release mechanism stops the movement of the pivot pin when the compression coil spring comes into close contact when the pivot pin moves from the lock position to the lock release position against the biasing force of the compression coil spring. The furniture according to claim 9, which is configured to be made. One end portion side of the pivot pin is arranged to protrude outward from the outer surface of the first or second arm,
The unlocking mechanism is configured such that the rotation of the second arm is unlocked by pressing the one end of the pivot pin so that the pivot pin moves from the locked position to the unlocked position. The furniture according to any one of claims 3 to 10, which is configured. A cap-like cover is attached to the one end of the pivot pin so as to cover the one end,
The unlocking mechanism is configured such that when the one end portion of the pivot pin is pushed and the pivot pin is moved from the lock position to the lock release position, the opening end portion of the cover is the first or second arm. The furniture according to claim 11, wherein movement of the pivot pin is stopped by contacting an outer surface.   The end portion of the horizontal portion and the lower end portion of the lower frame portion are connected via an angle adjuster that adjusts a deployment angle of the rising portion with respect to the horizontal portion. The furniture described.

Images