JP2007044147A - sofa - Google Patents

Abstract

PROBLEM TO BE SOLVED: In the case of a low back sofa, the back cannot be sufficiently leaned against the backrest and the sitting comfort is not good.
A sofa having a seat and a backrest, wherein the backrest has a high surface and a low surface, and the backrest rotates with or without a shaft supporting the backrest. When not in use, it can be rotated so that the low-height surface faces the front side of the sofa, and when it is used, the high-height surface faces the upper side or diagonally upper side of the sofa. In the sofa, the backrest has one or more backrests, and each backrest is attached to one shaft or separate shafts so as to rotate individually or together. In addition, a stopper mechanism that stops the backrest in a predetermined direction is connected, and the stopper mechanism rotates the outer periphery of the fixing tool provided with two or more stopping parts and the stopping part of the fixing tool. The rotating tool to be locked is provided with a lock spring that presses the rotating tool against the stopping portion of the fixing tool and locks the locking of the rotating tool to the stopping portion.
[Selection] Figure 1

Description

  The present invention relates to a one-seat or two-seat sofa or more.

  There are various designs for sofas. In recent years, instead of sofas with high backrest (high back sofas), sofas with low backrest (low back sofas) are gaining popularity.

  In the case of a low-back sofa, the height of the backrest is low, so that there is a problem that the back cannot be leaned sufficiently to the backrest and the sitting comfort is not good.

  The sofa of the present invention is a low back sofa that is popular by lowering the backrest height when not in use, and can be switched and used as a comfortable highback sofa by raising the backrest height when in use. It is.

  The sofa according to claim 1 of the present invention is a sofa having a seat and a backrest, the backrest having a high surface and a low surface, and the backrest together with a shaft supporting the shaft or a shaft. In addition, it can be rotated so that the low-height surface faces the front side of the sofa when not in use, and the high-height surface faces the upper side or obliquely upper side of the sofa when not in use.

  In the sofa according to claim 2 of the present invention, one or more backrests are provided in the sofa, and the two or more backrests rotate individually or together on one axis or on separate axes. It is attached to.

  According to a third aspect of the present invention, there is provided the sofa according to the third aspect, wherein a stopper mechanism for stopping the backrest in a predetermined direction is connected to the backrest, and the stopper mechanism includes a fixing tool provided with two or more stop portions, and a fixing tool. A rotating tool that rotates around the outer periphery of the fixing tool and is locked to the stopping part of the fixing tool, and a lock spring that presses the rotating tool against the stopping part of the fixing tool and locks the locking of the rotating tool to the stopping part. It should be prepared.

In the sofa according to claim 1 of the present application, the backrest is provided with a high surface and a low surface, and the backrest is rotated together with the shaft supporting it or separately from the shaft. There is an effect like this.
(1) In use, the back of the back can be leaned to the backrest with the height of the backrest being raised so that the tall side of the backrest faces the front of the sofa or diagonally upward. Can be used as a good high back sofa.
(2) When not in use, the height of the backrest can be kept low so that the low-back surface of the backrest faces the front of the sofa, and it can be used as a low-back sofa with good appearance. .
(3) Also, if the low-back surface of the backrest faces the front of the sofa, the high-height surface faces the top of the sofa and the depth of the seat becomes shallow. Therefore, even when the backrest is lowered, it is possible to sit on the sofa shallowly and it is easy to sit down.

The sofa according to claim 2 of the present application is provided with one or more backrests, and the two or more backrests are attached to one shaft or separate shafts so as to rotate individually or together. Therefore, in addition to the above effects, there are the following effects.
(1) When two or more backrests can be individually rotated, the height of the backrest of each seat can be arbitrarily selected, and the seated person can have a desired height.
(2) When two or more backrests can be rotated together, the height of the backrest of each seat can be changed at a time, and the height of the backrest can be switched in a short time.

In the sofa according to claim 3 of the present application, a stopper mechanism for stopping the backrest in a predetermined direction is connected to the backrest, and the stopper mechanism rotates around the outer periphery of the fixing tool provided with two or more stop portions. A rotating tool that moves and is locked to the stopping portion of the fixing tool, and a lock spring that presses the rotating tool against the stopping portion of the fixing tool and locks the locking of the rotating tool to the stopping portion. Therefore, in addition to the above effects, there are the following effects.
(1) Since the backrest can be stopped in a predetermined direction by the stopper mechanism, there is no possibility that the backrest will rotate even if it leans on the backrest, which makes it easier to use. It is also comfortable to sit on.
(2) Since the rotating backrest is locked by locking the rotating tool to the stopping portion of the fixing tool, the position and number of the stopping portions provided on the fixing tool are adjusted so that the backrest is engaged. The stop angle and the number of locking positions can be adjusted.

(Embodiment 1)
An example of the embodiment of the sofa of the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, the sofa 1 of the present embodiment is a sofa for two persons, and a seat 3 formed between two sleeves 2 on the left and right sides and a width for two seats, and two seats. The backrest 4 is provided. Two cushions 5 are provided on the seat 3. As shown in FIGS. 1 and 2, a single shaft 6 is provided between the left and right sleeves 2 through the backrest 4 for the two seats so that the backrest 4 can rotate. . The shaft 6 is provided with stopper mechanisms 7 in the vicinity of both ends of each backrest 4 so that the backrest 4 can be stopped in a predetermined direction. The sofa 1 of this embodiment is for two persons, and as shown in the figure, the seat 3 and the backrest 4 are provided for two seats, but the sofa 1 is not limited to two persons, It may be for one person or more than three. In that case, the seat 3 and the backrest 4 are provided according to the number.

  As shown in FIG. 1, the seat 3 is a seat portion provided between the sleeves 2 on the left and right sides. The seat 3 of this embodiment is formed in the width | variety for two seats, as shown to the same figure. The seat 3 is formed in a rectangular shape with a long width direction by combining plate materials, square materials, etc., and a cushion material such as urethane is arranged on the outer surface and a cover material such as cloth, leather or resin is hung. Covered. As shown in the drawing, two cushions 5 are densely arranged on the seat 3 to form a seat for two persons. The cushion 5 is formed by covering the periphery of a cushion material such as urethane with a cover material such as cloth, leather or resin. The cushion 5 can be arbitrary, such as one having a spring inside. Further, the cushion 5 may be wider than the seat 3 as shown in FIG. The two cushions 5 shown in FIG. 1 are densely provided on the seat 3, but the number and arrangement of the cushions 5 are not limited to this, and one cushion formed with a width corresponding to two seats. Arbitrary numbers and arrangements such as providing a large cushion 5 on the seat 3 can be employed.

  As shown in FIG. 3, the sleeve 2 is a side member of a sofa provided on both sides of the seat 3. The upper surface portion of the sleeve 2 also serves as an armrest on which an arm can be placed when the user sits down. As shown in FIGS. 3 to 5, the sleeve 2 is formed by placing a cushion material (not shown) such as urethane on the outer peripheral surface of the sleeve frame 10 and covering it with a cover material 11 such as cloth, leather or resin. It is what. One leg 12 is provided at the lower part of the sleeve 2 at the front and rear. The sleeve frame 10 includes an enclosure-like sleeve frame 13 formed by combining plate-like members, and an inner plate 14 and an outer plate 15 provided in side opening portions of the sleeve frame 13. The sleeve frame 13, the inner plate 14, and the outer plate 15 can be made of any material such as wooden, metal, or resin. As shown in FIG. 3, a shaft mounting hole 16 for mounting the shaft 6 is opened in the inner plate 14, and a nut 18 for fixing a shaft fixing tool 24 mounted on the shaft 6 with a bolt 17 is embedded. It is. Further, as shown in FIG. 3, the side plate of the inner plate 14 and the seat 3 is fixed with bolts 17 and nuts 18, and the seat 3 is fixed between the left and right sleeves 2. Although the leg 12 is provided in the lower part of the sleeve 2 of this embodiment, the leg 12 may be omitted and the lower part of the sleeve 2 may be directly grounded.

  As shown in FIG. 1, the backrest 4 is a backrest portion of the sofa provided between the left and right sleeves 2. As shown in the figure, the backrest 4 of the present embodiment is provided for two seats through a shaft 6 fixed between the left and right sleeves 2. As shown in FIGS. 7 and 8, the backrest 4 is formed by placing a cushion material 55 such as urethane on the outer peripheral surface of the backrest frame 19 and covering it with a cover material 20 such as cloth, leather or resin. Is. As shown in FIG. 2, the backrest 4 for two seats according to the present invention can be individually rotated with a shaft 6 as a rotation axis. The shaft 6 is provided with a stopper mechanism 7 including a fixture 8 fixed to the shaft 6 and a rotation unit 9 that rotates the outer periphery of the shaft 6 with the shaft 6 as a rotation axis. The moving backrest 4 can be stopped in a predetermined direction.

  The said axis | shaft 6 is one round pipe member as shown in FIG. 4, FIG. 5, Comprising: It becomes a rotating shaft of the backrest 4 of the sofa of this invention. As shown in FIG. 3, the shaft 6 is formed to a length that is attached between the left and right sleeves 2. Both ends of the shaft 6 are closed by a lid 21 as shown in FIGS. A bolt hole 22 is opened in the lid 21 so that the bolt 23 can be screwed therein. Further, as shown in FIG. 3, a shaft fixing tool 24 is fixed near both ends of the shaft 6. The shaft fixing member 24 is a plate-like member, and includes a shaft insertion hole 25 for inserting the shaft 6 and a bolt for fixing the shaft fixing member 24 to the inner plate 14 of the left and right sleeves 2 by bolts 17. A hole 26 is opened. The shaft 6 is inserted through the shaft insertion hole 25 of the shaft fixture 24 and is fixed by welding or the like. As shown in FIGS. 3 to 5, both ends of the shaft 6 are inserted into the shaft mounting holes 16 opened in the inner plates 14 of the left and right sleeves 2, and the bolts 23 are screwed into the bolt holes 22 of the lid 21. The bolts 17 are screwed into the bolt holes 26 of the shaft fixing tool 24 and screwed into the nuts 18 embedded in the inner plate 14 from the back side of the inner plate 14. It is fixed to the inner plate 14 of the sleeve 2 so as not to rotate.

  As shown in FIGS. 1 and 3, the stopper mechanism 7 is provided so as to be positioned near the end portion of the backrest 4 of the shaft 6. In this embodiment, the stopper mechanisms 7 are provided at four locations on the shaft 6 as shown in FIG. As shown in FIGS. 4 to 6, the stopper mechanism 7 includes a fixture 8 fixed to the shaft 6 and a rotation unit 9 that rotates the outer periphery of the shaft 6 with the shaft 6 as a rotation axis. It is.

  The fixture 8 is a plate-like member as shown in FIG. A shaft insertion hole 30 through which the shaft 6 is inserted is opened in the fixture 8. Moreover, the stop part is provided in the outer peripheral surface of the fixing tool 8 at two places, the upper surface side (31a) and the front surface side (31b) of the sofa 1. As shown in FIG. 6, the fixture 8 is fixed to the shaft 6 by welding or the like with the shaft 6 inserted through the shaft insertion hole 30. As shown in FIGS. 4 and 5, the fixture 8 is fixed to the shaft 6 so as to be positioned at both ends in the width direction of the backrest 4 from the rotation unit 9.

  As shown in FIG. 3, the rotating unit 9 is disposed next to the fixture 8 and is provided on the shaft 6. The rotation unit 9 is provided so as to be positioned on the inner side in the width direction of the backrest 4 than the fixture 8. As shown in FIG. 6, the rotation unit 9 includes a bearing 32, a cradle 33, and a cover 34. The cradle 33 is provided with a swinging tool 35, a turning tool 36, and a lock spring 37.

  As shown in FIG. 6, the bearing 32 is a cylindrical member having an inner diameter through which the shaft 6 can be rotatably inserted. The bearing 32 is provided on the outer periphery of the shaft 6 and is rotatable. The cradle 33 is a bowl-shaped member as shown in FIG. 6, and a recess 38 for installing the bearing 32 is formed in the upper part, and a side part for attaching the swinging tool 35. A swing tool mounting hole 39 is opened. Further, as shown in FIG. 7, a screw hole 40 for attaching the backrest frame 19 is opened in the bottom surface portion. The bearing 32 and the cradle 33 are fixed by fitting the bearing 32 into the recess 38 of the cradle 33 and welding.

  The cover 34 is a U-shaped plate-shaped member as shown in FIG. 6, and a screw hole 41 for attaching the backrest frame 19 is opened on the upper surface portion. A spring locking pin 42 for attaching the lock spring 37 is attached to the inner surface of the cover 34. The cradle 33 and the cover 34 are fixed by inserting both ends of the cover 34 into a bowl-shaped cradle 33 and welding. Accordingly, as the bearing 32 rotates, the receiving member 33 and the cover 34 also rotate, so that the entire rotation unit 9 can rotate about the shaft 6.

  As shown in FIG. 6, the swinging tool 35 is a member in which two elongated plate-like arms 43 are connected by a spring locking pin 44 and a roller locking pin 45 at a predetermined interval. The swinging tool 35 is provided on the receiving base 33 with the lower ends of the two arms 43 attached to the receiving base 33 so as to be swingable. As shown in the figure, the spring locking pin 44 is attached to the upper ends of the two arms 43, and the roller locking pin 45 is attached to the center of the two arms 43. The arms 43 are connected to each other. A hole 46 for attaching to the cradle 33 is opened at the lower end of the two arms 43. As shown in FIGS. 4 and 5, the interval between the two arms 43 is set as an interval attached to the outer surface of the cradle 33. One end of the spring locking pin 44 is provided so as to protrude to one side of the arm 43. The roller locking pin 45 is provided with one end protruding to the side opposite to the spring locking pin 44. As shown in FIG. 6, the swinging tool 35 has a receiving base 33 disposed between two arms 43, and a pin 47 is inserted into a hole 46 at the lower end of the arm 43 and a swinging tool mounting hole 39 of the receiving base 33. It is inserted and locked, and is attached to the cradle 33 so that it can swing around the pin 47.

  As shown in FIGS. 4 to 6, the rotating tool 36 is a roller attached to the roller locking pin 45 and is rotatably provided with the roller locking pin 45 as a rotation axis. is there. As shown in FIGS. 4 and 5, the rotating tool 36 is provided in contact with the outer periphery of the fixing tool 8, and is provided so as to move while rotating along the outer periphery of the fixing tool 8. The rotating tool 36 is locked at the stop portions 31 a and 31 b of the fixing tool 8. In the present embodiment, the rotating tool 36 locked to the stop portions 31a and 31b is prevented from moving before the stop portions 31a and 31b.

  As shown in FIGS. 4 to 6, the lock spring 37 is a spring provided with both ends locked to a spring locking pin 42 of the cover 34 and a spring locking pin 44 of the swinging tool 35. is there. A tension spring is used as the lock spring 37. In this embodiment, as shown in the figure, the rocking tool 35 is pulled toward the bearing 32 by the lock spring 37. Accordingly, the rotating tool 36 provided in the swinging tool 35 is always in pressure contact with the fixing tool 8 by pulling the lock spring 37, and when locked to the stop portions 31a and 31b, the locking tool 36 is locked. Is locked.

  As shown in FIGS. 3, 7, and 8, the backrest frame 19 is fixed to the cradle 33 and the cover 34 of the rotation unit 9, and the backrest 19 is rotatably provided on the shaft 6. 4 is a frame member. As shown in FIG. 3, the backrest frame 19 is formed in a box shape having a front opening by combining a front plate 50, a top plate 51, a bottom plate 52, a back plate 53, and side plates 54a and 54b. ing. The front plate 50, the top plate 51, the bottom plate 52, the back plate 53, and the side plates 54a and 54b can be made of any material such as wood, metal, or resin.

  As shown in FIG. 3, the front plate 50 is a rectangular plate, and two front plates 50 are provided for each backrest. The front plate 50 is fixed to the cover 34 of the rotating unit 9 with screws as shown in FIGS. As shown in FIGS. 7 and 8, the front plate 50 is located on the front surface when the tall surface 4 a of the backrest 4 is the front surface of the sofa 1.

  As shown in FIG. 3, the top plate 51 and the bottom plate 52 are elongated plates each having a shape in which a front surface portion is cut out, and one plate is provided for each backrest. As shown in the figure, the top plate 51 and the bottom plate 52 are formed in the same shape. As shown in FIGS. 7 and 8, the top plate 51 and the bottom plate 52 are positioned on the top and bottom surfaces when the tall surface 4 a of the backrest 4 is the front surface of the sofa 1.

  As shown in FIG. 3, the back plate 53 is a single plate material, and one back plate 53 is provided for each backrest. As shown in FIGS. 7 and 8, the back plate 53 is fixed to the cradle 33 of the rotating unit 9 with screws. As shown in FIGS. 7 and 8, the back plate 53 is located on the back surface when the tall surface of the backrest 4 is the front surface of the sofa 1. Further, the back plate 53 is formed with a depth shorter than that of the front plate 50, and when the height 4a of the backrest 4 is set to the front of the sofa 1, the height on the back side is lower than that on the front side.

  As shown in FIG. 3, the side plates 54 a and 54 b are formed by combining two plate materials, and are provided on the left and right side surfaces of the backrest 4. As shown in the figure, the side plates 54a and 54b are notched at the portion where the shaft 6 is located.

  Since the front plate 50 and the back plate 53 are fixed to the cover 34 and the cradle 33 of the rotation unit 9 with screws and the back frame 19 is fixed to the rotation unit 9, the rotation of the backrest 4 is performed. Accordingly, the rotation unit 9 can be rotated.

  As shown in FIGS. 7 and 8, the backrest 4 of the sofa 1 of the present invention has a cushion material 55 such as urethane disposed on the outer peripheral surface of the backrest frame 19, and a cover material 20 such as cloth, leather or resin. Formed by covering. As shown in FIGS. 2, 7, and 8, the backrest 4 has a surface 4 a having a high height and a surface 4 b having a low height.

  As shown in FIGS. 4, 5, and 7, the sofa 1 of the present invention has a backrest 4 in a state where the low-back surface 4 b of the backrest 4 is directed to the front (backrest angle 0 degree). 1 When the front side is lifted and rotated upward (see the arrow in FIG. 2), as the backrest 4 rotates, the rotation unit 9 rotates the outer periphery of the shaft 6 about the shaft 6 as a rotation axis. . Accordingly, the rotating tool 36 provided on the swinging tool 35 of the rotating unit 9 moves upward while rotating along the outer periphery of the fixing tool 8. When the rotating tool 36 is locked to the stop portion 31a on the back side of the sofa of the fixing tool 8, the locking is locked by the lock spring 37 (see FIG. 8). At this time, as shown in FIGS. 1, 2, and 8, the backrest 4 is lifted to an angle of about 115 degrees, and the tall face 4a of the backrest 4 is slightly inclined upward from the front. Stopped. The sofa 1 in this state has a high backrest 4 and can be used as a high-back sofa. In this case, the user can sit deeply on the sofa 1 and lean his back on the backrest 4.

  As shown in FIG. 8, the sofa 1 according to the present invention has an upper surface 4 a of the backrest 4 in a state in which the surface 4 a having a high backrest is slightly inclined upward from the front (backrest angle of about 115 degrees). When the side is pulled down and turned downward, the turning unit 9 turns the outer periphery of the shaft 6 downward about the shaft 6 as the backrest 4 turns. Accordingly, the rotating tool 36 provided on the swinging tool 35 of the rotating unit 9 moves downward while rotating along the outer periphery of the fixing tool 8. When the rotating tool 36 is locked to the stop portion 31b on the sofa front side of the fixing tool 8, the locking is locked by the lock spring 37 (see FIG. 7). At this time, as shown in FIGS. 4, 5, and 7, the backrest 4 is returned to the angle of 0 degrees, and the low-back surface 4 b of the backrest is locked facing the front. The sofa 1 in this state has a low backrest 4 and can be used as a low-back sofa. In this case, the user can sit on the sofa 1 and lean on the backrest 4 only on the waist.

(Embodiment 2)
Another example of the embodiment of the sofa of the present invention will be described. In the first embodiment, the shaft 6 is fixed between the left and right sleeves 2 through the backrest 4 and the backrest 4 can be rotated. However, the shaft 6 and the backrest 4 are fixed, The backrest 4 is prevented from rotating on the outer periphery of the shaft 6, the shaft 6 is rotatably provided between the left and right sleeves 2, the shaft 6 is rotated, and the backrest 4 is rotated along with the rotation of the shaft 6. Can also be rotated. In that case, when the backrest is more than two seats, the backrests more than two seats can be rotated synchronously.

(Embodiment 3)
Another example of the embodiment of the sofa of the present invention will be described. In each of the above embodiments, no partition is provided between the two seats 3 and the backrest 4, but when there are a plurality of seats 3 and the backrest 4, a partition is provided between each seat 3 and the backrest 4. You can also. At this time, the shaft 6 may be a single shaft that penetrates the partition and is fixed between the left and right sleeves, or a plurality of shafts that are fixed between the partitions.

(Embodiment 4)
Another example of the embodiment of the sofa of the present invention will be described. In each of the above embodiments, the shaft 6 is provided with the backrest 4 penetrating. However, the shaft 6 is not limited to the case of being provided with the backrest 4 penetrating. It is also possible to provide only the outer part of the drool 4. In this case as well, the shaft is fixed between the left and right sleeves so that the backrest can be rotated, or the shaft is fixed to the backrest so that the backrest rotates as the shaft rotates. It can also be. At that time, if the shaft is fixed between the left and right sleeves and the backrest is rotatable, and there are two or more backrests, a partition is provided between each backrest and seat. It is desirable to fix the axis of each backrest.

(Other embodiments)
In each of the embodiments described above, the backrest angle in a state where the high backrest 4a is slightly inclined upward from the front is set to about 115 degrees, and the low backrest 4b is faced up to the front. Although the turning angle is set to 0 degree, the locking angle of the backrest 4 is not limited to this, and can be set to any angle by adjusting the formation position of the stop portion 31 on the outer peripheral surface of the fixture 8. At this time, the backrest angle when the low backrest surface is facing the front is around 0 degrees, the backrest angle when the high backrest surface is slightly upward from the front is 90 degrees It is desirable to set it to about 130 degrees. Moreover, the stop part provided in a fixing tool is not restricted to two places, It can also form in three or more places and can also make the latching position of a backrest into three or more places.

  Further, in the sofa of the present invention, the sleeve 2 can be omitted, and the shaft 6 can be fixed to other parts such as the sofa seat 3 to provide a backless rotation type sofa without a sleeve.

  The sofa of the present invention is not limited to the configuration described in the above embodiment, and can have any configuration as long as the backrest is rotated and locked at a predetermined angle, Each member such as a seat, a backrest, a shaft, and a stopper mechanism is not limited to those shown in FIGS. 1 to 8 and may have any configuration.

  The backrest-rotating type sofa of the present invention is not limited to a sofa, but can be locked at a predetermined angle by rotating the backrest in various chairs having a backrest such as a dining chair, a counter stool, a chaise longue, etc. It can also be applied as a backrest-type chair that can be turned.

The front view which shows an example of embodiment of the sofa of this invention. The right view of the sofa of this invention shown in FIG. The disassembled perspective view which abbreviate | omitted a part of sofa of this invention shown in FIG. Front explanatory drawing which shows the mode inside the backrest of the sofa of this invention shown in FIG. Plane explanatory drawing which shows the mode inside the backrest of the sofa of this invention shown in FIG. The disassembled perspective view of the rotation unit of the sofa of this invention shown in FIG. Side surface sectional drawing which shows the mode of the rotation unit in the state which turned the back of the sofa of this invention shown in FIG. Side surface sectional drawing which shows the mode of the rotation unit in the state which turned the back of the sofa of this invention shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sofa 2 Sleeve 3 Seat 4 Backrest 4a High-back surface of backrest 4b Low-back surface of backrest 5 Cushion 6 Axis 7 Stopper mechanism 8 Fixing tool 9 Rotating unit 31a, 31b Stop part 36 Rotating tool 37 Lock spring

Claims (3)

  In a sofa having a seat and a backrest, the backrest has a high surface and a low surface, and the backrest rotates together with the shaft supporting it or separately from the shaft, and when not in use, the low surface The sofa can be rotated so that the front side of the sofa faces the upper side or the upper side of the sofa or the diagonally upper side when used.   The sofa according to claim 1, wherein the backrest is provided with one or more backrests, and the two or more backrests are attached to one shaft or separate shafts so as to rotate individually or together. And a sofa. The sofa according to claim 1 or 2, wherein a stopper mechanism for stopping the backrest in a predetermined direction is connected to the backrest, and the stopper mechanism includes a fixture provided with two or more stops, and an outer periphery of the fixture. A rotation tool that rotates and is locked to the stop portion of the fixing tool, and a lock spring that presses the rotation tool against the stop portion of the fixing tool and locks the locking of the rotation tool to the stop portion. Characteristic sofa.

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