JP6353213B2 - Rocking chair - Google Patents

Description

  The present invention relates to a rocking chair.

  As one type of rocking chair whose backrest tilts backward, there is a type in which the backrest tilts backward while shifting its pivotal fulcrum. In the case of a movable chair such as an office swivel chair, the backrest is often attached to the base provided at the upper end of the leg, so in the type in which the pivotal fulcrum of the backrest moves forward during locking, the backrest is generally The rotation fulcrum and a portion behind or above the pivot are supported by a guide portion provided on the base so as to be movable.

  As a prior document regarding this type of chair, there is Patent Document 1 filed by the present applicant. In this Patent Document 1, the backrest is provided with a submerged portion that enters the lower part of the seat, and left and right laterally provided pins provided at the front end of the submerged portion are fitted in the front and rear longitudinal guide holes provided on the base so that the backrest tilts backward. In addition, a horizontally long slide pin is provided at the rear end of the base, and is fitted into an arc-shaped long slot provided in a submerged portion of the backrest to guide the sinking of the backrest. Moreover, in patent document 1, the subtraction part of the backrest and the seat are connected, and the seat moves forward when the backrest tilts backward.

JP 2013-198564 A

  In the chair of Patent Document 1, the backrest tilts backward with the slide pin as the center, but the backrest tilts backward while changing (advancing) the rotation fulcrum, so that even if the upper end of the backrest is not moved largely backward, it is large. A rocking angle can be obtained. For this reason, even if it is a case where a chair is packed up and down, for example, a moderate rocking state can be obtained without inconvenience a person behind. Moreover, the comfort in a locked state can be improved also by a body becoming selfish by locking.

  Although the chair of patent document 1 has such an excellent function, it is beneficial for a new user if the manufacturing cost can be reduced.

  The present invention has been made with such a current situation as an opportunity, and an object of the present invention is to make it possible to manufacture a rocking chair at as low a cost as possible.

Rocking chair of the present invention, Ri toe of claim 1,
A base provided at the upper end of the "legs, and arranged seat on the base, has a backrest mounted for the rear tilt on the base, it said backrest, slip enters below the seat And a rearward tilt against the locking spring around the pivot shaft at the front end of the submerged part, and the rearward tilt is guided by a fixed guide means provided on the base or seat. Configuration,
Rotation shaft of the backrest is upwardly moving non retained in the seat by list covers the upper surface of the base "
That's it.

  The invention of the present application also includes the structure of claim 2 and below. Of these, the invention according to claim 2 is the invention according to claim 1, wherein the rotating shaft portion is slidably mounted on the upper surface of the base. As a specific example of claim 2, in claim 3, the rotation shaft portion is configured by a bearing that is in surface contact with the upper surface of the base and a support shaft fitted in the bearing.

  According to a fourth aspect of the present invention, in the third aspect, the bearing portion is slidably mounted on the upper surface of the base, and the support shaft is provided with a spring bearing that supports the locking spring.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the base is made of a metal plate and is provided with flanges projecting outward on the left and right sides, and the rotating shaft portion is the flange. It is on the top surface. As a specific example of claim 5, in claim 6, the seat has a resin seat plate and a cushion disposed on the resin seat plate, and the seat plate is positioned below the flange of the base. And a support portion that prevents upward movement of the rotation shaft portion.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the submerged portion and the seat are connected, and the seat also moves forward when the backrest tilts backward.

  According to the first aspect of the present invention, since the pivot shaft portion of the submerged portion is only placed on the base, the pin insertion step can be omitted, and the manufacturing cost can be reduced accordingly. Moreover, since it is not necessary to provide a pin hole in the base, it is possible to contribute to increasing the strength of the base. In particular, since the pin hole is a long hole in the system in which the seat slides back and forth, the base is applied to the type in which the seat moves back and forth as in claim 2 and the rotating shaft portion is slid on the upper surface of the base. It is preferable that the seat can be allowed to move back and forth while the strength of the seat is increased.

  If the rotation shaft portion is constituted by the bearing and the support shaft as in claim 3, the stability of the rotation shaft portion can be improved. Furthermore, in the structure of Claim 3, since a bearing slides on a base in the state of surface contact, durability of a bearing can be improved. In this case, if the bearing is made of resin, it is a process that can prevent rubbing noise (a lubricant such as grease may be applied).

  When the seat slides back and forth during locking, the locking spring can be supported by the seat. However, if a spring support is provided on the support shaft as in claim 4, the seat is mounted with the locking spring set to the base. This makes it easy to assemble.

  When the seat is supported by the base, it is preferable to receive the seat in a certain area in order to prevent stress concentration. In this case, it is possible to secure a support area by interposing a spacer between the base and the seat. However, if the base is made of a metal plate and the seat is supported by a flange as in claim 5, the base is strengthened. Since the seat can be supported without using other members while being made of excellent metal, it is suitable in terms of strength, cost, and member management. Since the flange also exhibits a rib effect, there is an advantage that the strength of the base can be further improved.

The rotating shaft portion is held so as not to move upward by the seat. In this case, if a structure in which the flange of the base is held from below by the holding portion of the seat as in claim 6, a simple structure is adopted. in can be prevented reliably missing. In addition, comfort can be improved by advancing the seat when locked as in claim 6. However, since the flange of the base is long in the front and back, it prevents the seat from coming off the base without hindering the back and forth movement of the seat. There are advantages you can do.

  By connecting the backrest and the seat as described in claim 7, the same comfortable locking performance as that of Patent Document 1 can be easily realized.

It is an external view of the chair which concerns on embodiment, (A) is a perspective view from the front, (B) is a perspective view from the back. It is a partial fracture perspective view in the state where a cushion was omitted. It is a partial fracture separation perspective view in the state where a cushion was omitted. It is a perspective view in the state where a cushion was omitted. It is a partial separation perspective view in the state where a seat and a cover were omitted. (A) is a separated perspective view of a slide mechanism, (B) is a separated perspective view of a stopper and a base. It is a perspective view which shows the circumference of a base. (A) is a longitudinal side view of a substantially central portion, (B) is an exploded perspective view of a front and rear spring receiver, and (C) is a partial side view of a front spring receiver. (A) is the isolation | separation perspective view in the state which fell the seat board, (B) is the perspective view turned over and shown in order to show the relationship between a seat inner shell and a bearing. It is a separate perspective view which shows the attachment method of a seat board. (A) is the perspective view seen from the back in the state which fractured | ruptured the seat board, (B) is a perspective view which shows the relationship between a seat board, a rear part spring receiver, and a stopper. (A) is the perspective view from the back which shows the relationship between a base and a seat board, (B) is the perspective view which looked at the seat board from back, (C) It is the XIIC-XIIC sectional view taken on the line in FIG.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the words “front and rear” and “left and right” are used to indicate the direction. These front and rear and left and right words are used by a person who normally sits on a rocking chair (hereinafter simply referred to as a chair). It is based on the direction.

  First, an outline will be described. The chair of the present embodiment is applied to a so-called rotating chair that is frequently used for office work. The chair has, as main elements, a leg 1 (gas cylinder) 2 and a leg 1 having branch legs, and an upper end of the leg 2. A base 3 attached to the base 3, a seat 4 disposed above the base 3, and a backrest 5 connected to the base 3 so as to be able to tilt backward. A caster is provided at the tip of each branch leg constituting the leg 1. An armrest can be attached to the left and right side surfaces of the base 3 as an optional product.

  The base 3 is made of, for example, a sheet metal such as a steel plate. As shown in FIG. 4, the base 3 has a box shape with an upward opening having a bottom plate, left and right side plates 3a, and a front plate 3b, and is long in the front-rear direction. . Further, as clearly shown in FIG. 8, the base 3 has a lower member 6 having an upward opening, and an upper end of the leg support 2 is fitted to a bush 7 penetrating the lower member 6 and the base 3. It is fitted. A support member 8 for attaching an armrest is provided in front of the leg column 2 in the base 3.

  As clearly shown in FIG. 4, left and right side flanges 3 c that are long in the front-rear direction are provided at the upper ends of the left and right side plates 3 a constituting the base 3. The front portion of the side flange 3c is cut out over a certain range (the cut-out portion is indicated by reference numeral 9).

  The seat 4 mainly includes a resin seat inner shell (seat plate) 10 and a cushion 11 (see FIG. 8) disposed thereon, and the cushion 11 is a skin material (not shown) such as cloth or leather. ). Details of the seat inner shell 10 will be described later. As can be understood from FIG. 3, the seat inner shell 10 is covered with a lower cover 12 from below. The lower cover 12 is attached to the seat inner shell 10 by fitting the left and right engagement projections 13a provided on the lower cover 12 to the engagement boss 13b of the seat inner shell 10 (see FIG. 9).

  For example, as shown in FIG. 3, the backrest 5 includes a resin outer back shell 15, a resin back inner shell (back plate) 16 disposed on the front surface thereof, and a cushion 16 a disposed on the front surface of the back inner shell 16 (FIG. 1). And the cushion 16a is covered with a skin material such as a cloth.

  As can be understood from FIGS. 2 to 5, the back outer shell 15 has a submerged portion 17 that enters under the seat 4. The submerged portion 17 has a bifurcated shape separated left and right so as to be positioned on both the left and right sides of the base 3, and a left and right longitudinal support shaft 18 is spanned between the front ends of the left and right submerged portions 17. Is attached to the front end of the submerged portion 17 via a bearing 19. Accordingly, in the present invention, the support shaft 18 and the bearing 19 correspond to the rotating shaft portion described in the claims.

  The bearing 19 is made of, for example, resin, and is fitted from the outside into a circular bearing hole 20 provided at the tip of the submerged portion 17 and overlaps the flange 3 c of the base 3. A portion overlapping the flange 3c is a flat surface. In this case, the flat surfaces are formed up and down, but this is for eliminating the directionality and facilitating the assembly, and for increasing the support area of the seat inner shell 10. The bearing 19 is held so as not to be detached by a downward rib 21 (see FIG. 11) provided on the seat inner shell 10.

  As shown in FIGS. 2 to 5, a rear spring receiver 23 that supports a rocking spring (compression coil spring) 22 from behind is fixed to the left and right intermediate portion of the support shaft 18. As shown in FIG. 6, the rear spring receiver 23 has left and right rearward side plates 23a, and the support shaft 18 is welded through the upper portion of the rearward side plate 23a.

  As clearly shown in FIG. 6, a notch 24 opened rearward is formed in the left and right side plates 23 a of the rear spring receiver 23, and a resin stopper 25 is fitted into the notch 24. The stopper 25 is supported from behind by a support piece 26 cut and raised on the side plate 3 a of the base 3, and a lateral lip 27 provided on the stopper 25 is opened on the side plate 3 a of the base 3 to form the support piece 26. Is fitted in the window hole 28. For this reason, the stopper 25 is held so as not to fall off. An upper support piece 23 b that projects forward is provided at the upper end of the rear spring receiver 23.

  The retracted position of the rear spring receiver 23 is regulated by a stopper 25. Further, since the support shaft 16 to which the rear spring receiver 23 is fixed is connected to the back outer shell 15, the stopper 25 also defines the initial posture of the backrest 5 (the neutral posture when no load is applied). Yes. Since the stopper 25 is made of resin, it is possible to prevent or remarkably suppress the occurrence of a collision sound when the rear spring receiver 23 collides.

  As shown in FIGS. 5 and 6, a front spring receiver 29 is attached to the front plate 3 b of the base 3. As clearly shown in FIG. 8, the front spring receiver 29 is composed of a sheet metal front part 29a and a resin rear part 29b. As shown in FIG. 6, the front part 29a has forward projections provided on the left and right sides thereof. The positioning is performed by fitting the positioning hole 30b provided in the front plate 3b of the base 3 to 30a.

The rear part 29b has a substantially cup-like shape that faces forward, and is provided at the center, and the shaft is fitted and fixed to the front part 29a. In FIG. 8A, the rear part 29b is only roughly displayed, but in reality, the rear part 29b has a rear end surface and an outer periphery as shown in FIGS. Stepped portions 29c are formed in a plurality of locations (three locations) along the circumferential direction, with the corner portions that are continuous with the surface being formed, and spring portions 29d that can bend and project in the respective stepped portions 29c. Has been established.

  The spring portion 29d is shaped like a band plate, the tip portion is a mountain shape with a small depression angle, and the portion in front of it is spreading like a hook. Therefore, it has a shape similar to the outer shape of the onion. And the front-end | tip (rear end) of each spring part 29d protrudes back rather than the rear surface of the back part 29b.

A land portion 23c is provided at the center of the rear spring receiver 23, and the forward position of the rear spring receiver 23 is restricted by the land portion 23c coming into contact with the front spring receiver 29. If it only hits the receptacle 29, there may be a case where a sound is generated due to an impact at the time of collision.

On the other hand, when the spring portion 29d is provided in the rear spring receiver 29 as in the present embodiment, the speed at the time of the collision of the front spring receiver 23 is rapidly decelerated, so that it is possible to prevent the occurrence of collision noise. If the spring portion 29d is in the form of both-end support in which both ends are connected to the stepped portion 29c as in the embodiment, there is an advantage that a high buffering action can be maintained because the tension force increases as the load increases. It spring part is also possible to provide the rear spring bearing 23 may be set only to both the rear spring bearing 23 and the front spring receiver 29. It is also possible to provide a buffer spring as a separate member on the front spring receiver 29 or the rear spring receiver 23.

  On the upper end of the front part 29a in the front spring receiver 29, left and right support bars 31 protruding left and right of the front part 29a are fixed by welding. In FIG. 6, the support bar 31 and the front spring receiver 29 are separated from each other, but both are welded as shown in FIG.

  As shown in FIG. 7, the base 3 is formed with a rearward projecting portion 3d that protrudes rearward between the left and right submerged portions 17 of the back outer shell 15, and has a laterally long lateral shape at the rear end portion of the rearward projecting portion 3d. The guide shaft 32 is fixed. The guide shaft 32 protrudes to the left and right outer sides of the rear end portion of the rearward projecting portion 3d, and the protruding tip portion is fitted in a guide groove 33 provided on the inner surface of the submerged portion 17 in the back outer shell 15.

  The guide groove 33 has a substantially upward concave arc shape, and the backrest 5 tilts backward about the support shaft 18 while being guided by the guide groove 33 and sinking. That is, it tilts backward while moving the pivot fulcrum toward you. Therefore, the backrest 5 moves in the same manner as Patent Document 1.

As shown in FIG. 10, a downward opening 33 a is formed at the front end of the guide groove 33. Accordingly, the submerged portion 17 can be attached to the guide shaft 33 simply by moving from the top to the bottom. The guide shaft 32 and the guide groove 33 are an example of guide means for tilting the backrest 5 while sinking the backrest 5 (the guide shaft 32 is a fixed guide means and the guide groove 33 is a movable guide means).

  The back outer shell 15 of the backrest 5 functions as a strength member. For example, as shown in FIG. 5, a number of reinforcing ribs are formed in the submerged portion 17 and a portion connected thereto. As shown in FIGS. 3 to 5, two left and right joint bars 37 connected by left and right horizontally long stays 36 are attached to the submerged portion 17 of the backrest 5, and the back inner shell 16 is attached to the joint bar 37. .

  The joint bar 37 has a forward lower portion 37a, an upright rear portion 37b, and an intermediate portion 37c that connects the two. The forward lower portion 37a is fitted in a tunnel portion 38 formed in the submerged portion 17 of the back outer shell 15. The intermediate portion 37 c is fitted in a holding groove 39 provided in the back outer shell 15. Then, a cylindrical portion (not shown) is fitted downward on the rear surface of the back inner shell 16 in the upright rear portion (back strut) 37b.

  As shown in FIGS. 4 and 5, a catch 40 is provided on the front surface of the back outer shell 15 to hold the back inner shell 16 so as not to be detached. The back inner shell 16 is provided with an engaging projection (not shown) that fits into the catch 40 from above. Therefore, the back inner shell 16 is reinforced by the joint bar 37 while being held on the back outer shell 15 so as not to be detached by fitting the engagement protrusion and the catch 40 together.

  For example, as shown in FIG. 6, a lift lever 42 for releasing the lock of the leg support 2 is provided on one of the left and right sides of the base 3, and the backrest 5 can be locked on the other side of the base 3. A lock lever 43 is provided for switching to an incapable state. The elevating lever 42 has a rod 44 that pushes the valve of the leg column 2, and the rod 44 is rotatably held by a resin holder 45 fixed to the base 3.

  The lock lever 43 is attached with a rod 46 that rotates around a horizontally long shaft center, and a front end portion of the lock body 47 is fixed to a rotation shaft portion of the rod 46. The lock body 47 is attached to the holder 45 via the rod 46, and when the lock lever 44 is rotated, the lock body 47 rotates so that the rear end thereof moves up and down. The end is positioned in front of the stay 36 connecting the joint bar 37 or is shifted upward. As a result, the backrest 5 is switched between a state in which the backrest 5 can tilt backward and a state in which the backrest 5 cannot tilt backward.

  As shown in FIGS. 2 and 3, the seat inner shell 10 is divided into a front portion 10b and a rear portion 10c with a hinge portion 10a having a large number of recesses 48 interposed therebetween, and the rear portion 10c is tilted rearward with respect to the front and rear 10b. Can do. In addition, the division | segmentation with the front part 10b and the rear part 10c means the front and back of the hinge part 10a, and is not the division based on the front-back intermediate point.

  As shown in FIG. 9, FIG. 11 (B), and FIG. 12, the seat inner shell 10 is formed with a downward frame 49 having left and right side plates 49a and a front side plate 49b. By providing the holding piece 50 and holding the flange 3c of the base 3 from below with the holding piece 50, the upward movement of the seat inner shell 10 is prevented (particularly, see FIG. 12A).

  Further, as can be easily understood from FIG. 12C, the slide portion 51 that is placed on the end portion of the support bar 31 provided at the front end of the base 3 is provided inside the side plate 49 a in the downward frame 49. Therefore, the end portion of the support bar 31 is fitted in the long groove 52 between the slide portion 51 and the holding piece 50, and this also prevents the seat inner shell 10 from moving upward.

  As shown in FIG. 9 and FIG. 11 (B), a notch 53 is formed in a portion near the rear end of the holding piece 50. This is to allow fitting into the support bar 31 when attaching the seat inner shell 10 to the base 3. Further, as described above, the notch 9 is formed in the front part of the flange 3c in the base 3, and the notch 9 is the rear end part of the holding piece 50 (the part behind the notch 53). Is to drop into the lower side of the flange 3c.

For example, as can be understood from FIG. 11, the downward frame 49 of the seat inner shell 10, that has established a center support portion 54 abutting or close to the upper support piece 23b of the rear spring bearing 23. Also, as shown in FIG. 9 (B), the seat inner shell 10 is provided with a pressing portion 55 abuts from above into the bearing 19 in the rear retraction state. Since the bearing 19 and the seat inner shell 10 move back and forth together, the seat inner shell 10 is supported by the flange 3c of the base 3 through the bearing 19 and slides.

  As shown in FIG. 11 (B), a boss body 56 is provided at the rear portion of the downward frame 49 of the seat inner shell 10 so as to hit the rear spring receiver 23 from the front. When the boss body 56 is pushed by the rear spring receiver 23, the seat inner shell 10 moves forward. In the state where the seat inner shell 10 is fully retracted, the rear spring receiver 23 hits the stopper 25 as described above, and the rear spring receiver 23 is restricted from the retracted position with respect to the seat inner shell 10. The seat inner shell 10 and the back outer shell 15 are connected as will be described later, and the seat inner shell 10 is pulled backward by the back outer shell.

  Two boss bodies 56 are arranged on the left and right sides so as to be in close contact or abutting with the inner side surface of the base 3 in a surface contact state. Yes. In this case, since the boss body 56 is provided in the resin seat inner shell 10, no sound is generated when the seat 4 moves back and forth. In addition, since the boss body 56 holds the function of advancing the seat 4 and the function of preventing left-right displacement, the structure can be simplified accordingly.

  Next, referring to FIGS. 9 and 10, a structure in which the seat inner shell 10 is connected to the back outer shell 15 will be described. A downward front catch 57 having left and right inward claws 57a is provided in a portion near the left and right ends of the rear portion of the seat inner shell 10, while a front catch 57 is provided in the submerged portion 17 of the back outer shell 15. Is provided with a rear catch 58 that fits from the front. The rear catch 58 is provided with an outward claw 58a with which the inward claw 57a is engaged so that it cannot be pulled out upward.

  Further, a stopper claw 59 extending toward the front is provided on the left and right inner sides of the front catch 57 of the seat inner shell 10, while the stopper claw 59 is fitted into the submerged portion 17 of the back outer shell 15 from above. A stopper hole 60 is provided.

  The stopper claw 59 has a free end at the front end, and the claw portion 59a has an inclined surface 59b that becomes higher as going back. For this reason, when the seat inner shell 10 is shifted rearward with the rear catch 57 fitted in the catch receiver 58, the stopper claw 59 is elastically deformed so as to be raised upward, and then, when the seat inner shell 10 is pushed all the way down, it is elastic. The original posture is restored by the restoring force, and the claw portion 59a is fitted into the stopper hole 60 from above. Thereby, the seat inner shell 10 is held so as not to move back and forth. The front end of the stopper hole 60 of the submerged portion 17 is constituted by a wall 60a, and an inclined guide rib 61 for inviting the stopper claw 59 is provided on the wall 60a.

  A hook-like rear claw 62 is provided at the rear end of the seat inner shell 10, and a rib 63 that holds the rear claw 62 so as not to move upward is provided in the submerged portion 17 of the back outer shell 15. This forcibly lowers the rear end of the seat inner shell 10 together with the back outer shell 15 during locking.

  In the above configuration, when a seated person leans on the backrest 5, the back outer shell 15 moves backward while descending around the support shaft 18, and the seat 4 moves to the back. It is pushed forward by a support shaft 18 attached to the outer shell 15 and moves forward. For this reason, the same comfortable rocking state as patent documents 1 can be obtained. When the back outer shell 15 returns and rotates, the back outer shell 15 returns and rotates by the locking spring 22, and the seat 3 is pulled by the back outer shell 15 and retracts.

  The rotating shaft portion composed of the support shaft 18 and the bearing 19 has a simple structure that is simply mounted on the base 3 from above, and the seat inner shell 10 is inserted into the base 3 and the back outer shell 15 by insertion from the front. Assembling is very easy. This can contribute to cost reduction.

  The support bar 31 that supports the front portion of the seat inner shell 10 may be fixed to the base 3. However, if the support bar 31 is fixed to the front spring receiver 29, the front spring receiver 29 has a forward projection 30 a, a positioning hole 30 b, and the like. Therefore, there is an advantage that it can be mounted with high accuracy and easily.

  In the above embodiment, the backrest guide is provided by the guide shaft 32 provided on the base 3. However, the backrest guide means can employ various configurations. The backrest 5 may be connected to the seat so as to be movable relative to the seat. The present invention can also be applied to a chair in which the seat does not move forward when locking (the seat can be configured such that at least the rear portion only tilts backward when locking). It can also be applied to a stationary chair that is not mobile.

  The rotating shaft portion is not necessarily composed of a support shaft and a bearing, but can be composed of only a support shaft, or the shaft portion can be provided integrally with the back outer shell. In the case of a chair in which the pivot shaft portion does not move back and forth, it is possible to provide a slot with an upward opening in the base and fit the pivot shaft portion into the slot. The backrest can also be composed of a frame that is open at the front and rear and a mesh material stretched on the frame. In this case, a sinking portion is provided in the frame. The diving portion may be fixed to a back outer shell or the like as a separate structure.

  It is not always necessary for the rotating shaft portion to be supported by the flange of the base. For example, when the base is made of sheet metal, the left and right side plates may have no flanges, a resin receiving material may be attached to the left and right side plates, and the rotating shaft may be supported by this receiving material (the receiving function is It is also possible to mount the bearing directly on the side plate by providing it on the bearing.) When the bearing is provided, aluminum die-casting or metal cut-out product can be adopted, and the material and form can be arbitrarily set.

  Furthermore, the base is not limited to a metal plate, and an aluminum cast product, a cast product, a resin molded product, or the like can be used. It is also possible to make a composite product of different materials.

  The present invention can be embodied in a chair. Therefore, it can be used industrially.

1 leg device 3 base 3c flange 4 seat 5 backrest 10 seat inner shell (seat plate)
DESCRIPTION OF SYMBOLS 15 Back outer shell which comprises backrest 17 Submerged part of back outer shell 18 Support shaft which comprises rotating shaft part 19 Bearing which comprises rotating shaft part 22 Locking spring 23 Rear spring receiver 29 Rear spring receiver 32 Fixed guide of backrest Guide shaft constituting means 33 Guide groove constituting movable guide means for backrest 50 Holding piece 51 Slide portion 52 Long groove 54 Center support portion 55 Pressing portion (support portion)
57 Catch 58 Catch Receiver 59 Stopper Claw 60 Stopper Hole

Claims (7)

A base provided at the upper end of the leg, and arranged seat on the base, has a backrest mounted for the rear tilt on the base, it said backrest, slip unit enters below the seat And is tilted rearward against the locking spring around the pivot shaft at the front end of the submerged portion, and the rearward tilt is guided by the fixed guide means provided on the base or seat. Because
The rotating shaft portion of the backrest rests on the upper surface of the base and is held immovable upward by the seat.
Rocking chair. The rotating shaft portion is slidably mounted on the upper surface of the base.
The rocking chair according to claim 1. The rotating shaft portion is composed of a bearing that is in surface contact with the upper surface of the base and a support shaft that is fitted into the bearing.
The rocking chair according to claim 2. The bearing is slidably mounted back and forth on the upper surface of the base, while the support shaft is provided with a spring bearing that supports the locking spring.
The rocking chair according to claim 3. The base is made of a metal plate and has flanges projecting outward on the left and right sides, and the rotating shaft portion is placed on the upper surface of the flange.
The rocking chair according to any one of claims 1 to 4. The seat includes a resin seat plate and a cushion disposed thereon, and the seat plate includes a holding piece located below the flange of the base, and the rotating shaft portion. And a support portion for preventing upward movement,
The rocking chair according to claim 5. The submerged portion and the seat are connected, and the seat moves forward when the backrest tilts backward,
The rocking chair according to any one of claims 1 to 6.

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