JP2011161123A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a seated person from feeling uncomfortable due to a guide shaft bumping against an end of an elongated hole (bush) in a chair whose tilting range of a backrest is regulated according to the stroke of the guide shaft moving in the elongated hole. <P>SOLUTION: Pairs of upper and lower projections 27 are provided at a front end part and a back end part of the bush 24 respectively. The upper and lower projections 27 are inclined in such a way as the interval between them is reduced as they approach the end of the bush 24 and a guide shaft 25 is braked when abutting on an inclined surface of both of the projections 27. Further, the guide shaft 25 moves to a front end surface 24b or a back part end surface 24c of the bush 24 beyond the projections 27. As costs for devising the shape of the bush 24 do not increase and the guide shaft 25 moves to the end of the bush 24, thereby durability of the projections 27 does not decrease or the guide shaft 25 does not stop moving by being held between the upper and lower projections 27. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rocking chair whose backrest tilts backward against spring means (elastic means).

  In terms of the relationship between the backrest and the seat, there are two types of rocking chairs with the backrest tilted backward: a normal type in which the seat does not move when rocking and only the backrest tilts backward, and a synchronized type in which the seat moves together when rocking. The synchro type is further divided into a type in which the seat moves backward (and tilts backward) together with the backrest when locking, and a type in which the seat moves forward when locking. The applicant of the present application discloses an example of a type in which the seat moves forward when locking.

  Although there are various attachment structures for the backrest, in general, the backframe is often attached to the backframe by connecting the backframe to a base fixed to the legs so as to be tiltable. In the case of the normal type that does not move, the seat is fixed to the base. On the other hand, among the synchro types, the type in which the seat tilts backward when locking is often connected to the base and the back frame to form a triangular link structure. On the other hand, in Patent Document 1, the seat is slidably supported by the base.

  In any case, the rocking chair requires a means for regulating the backward tilt range of the backrest (if the seat moves back and forth, the back and forth movement range of the seat), and as a means for that purpose, a guide is provided in a slot provided in the base. The tilting range of the backrest is often regulated by inserting the shaft in a slidable manner and regulating the stroke of the guide shaft with a long hole. In this case, resistance to locking is given by supporting the movement of the guide shaft with a spring. That is, the guide shaft has two functions, that is, regulation of the tilting stroke of the backrest and support of the spring.

  The tilt restricting means by such a long hole and a guide shaft is not only excellent in the regulation function because the guide shaft is securely held in the long hole, but also has a structure because the guide shaft can have two functions. There is an advantage that can contribute to the simplification of the guide, but when the backrest tilts backwards at the time of locking or when the backrest returns from the locking state, the guide shaft hits the end of the slot and makes a sound Sometimes.

  In relation to such a phenomenon, in Patent Document 2 relating to the application of the present applicant, a frictional resistance imparting member is disposed in a portion different from the elongated hole and the guide shaft to prevent a rapid movement of the backrest. It is disclosed.

Japanese Patent Application No. 2008-220758 JP 2000-333760 A

  Patent Document 2 tries to eliminate the impact at the time of stopping by gently tilting the backrest, so it can be said that it is functionally superior, but it must be arranged by adding a dedicated member. The cost increase cannot be denied.

  The present invention has been made in view of such a situation, and in a chair of a type in which a tilting range such as a backrest is regulated by a long hole and a guide shaft, a sound is generated when the guide shaft is stopped. It is intended to eliminate the effects of shock and impact with a simple structure.

  The chair according to the present invention is provided with a seat and a backrest and a base that supports them, and at least one of a front / rear slide of the seat and a rearward tilt of the backrest is allowed, and The basic structure is that the range in which the seat slides back and forth or the range in which the backrest tilts or both are regulated by the relative movement of the guide shaft inside the long hole provided in the base or other member. Yes.

  And in invention of Claim 1, in the said basic structure, the braking part which provides resistance with respect to the relative movement of the said guide shaft in the part near the one end or the part near the other end or the part near both ends of the elongated hole. The guide shaft is provided in a state that does not hinder the relative movement of the guide shaft to the end of the long hole.

  A second aspect of the present invention is the rocking chair according to the first aspect, wherein at least a rearward tilt of the backrest is allowed, and a tilting range of the backrest is restricted by a combination of the elongated hole and the guide shaft. Further, the invention according to claim 3 is the seat according to claim 1, wherein the seat is supported by the base so that the seat can be slid forward and backward, and the seat and the backrest can be tilted backward. The seats are linked to each other so that the seats move forward.

  Since the present invention has a simple structure in which a braking portion is simply provided on the inner surface of the elongated hole, it is possible to prevent the occurrence of a shocking sound during locking and back-and-forth movement of the seat while preventing or remarkably suppressing cost increase. . In addition, the guide shaft is not stopped by the braking portion, but the guide shaft is stopped after moving to the end of the elongated hole, so that an excessive load is not applied to the braking portion, and the braking portion is high. Durability can be secured and the movement stroke of the guide shaft is also constant.

  In the link type synchro-type chair, the backward movement and backward tilt of the seat are supported by the spring means. Therefore, the spring means has a certain strength so that the seat does not move backward and backward in the non-locking state. You have to use things. On the other hand, the chair according to the invention of claim 2 is slidably supported on the base of the seat, so that the spring means only needs to have strength to give resistance to the rearward tilting of the backrest, and is therefore weak. There is an advantage that a spring can be used and the cost can be reduced.

  On the other hand, the chair specified in claim 3 is presumed to be related to the fact that the seat slides back and forth and locks lightly when a weak spring is used. In both cases, there was a tendency for squeaks and abnormal noises to occur. According to the second aspect of the present invention, when the guide shaft moves forward or backward and stops, the momentum is cut by the guide shaft hitting the braking portion of the long hole, so that the guide shaft hits the end of the long hole and a sound is generated. Can be prevented accurately (impact can also be prevented). Therefore, it can be said that the present invention is particularly useful in the chair specified in claim 2.

It is a whole perspective view of a chair. It is a vertical side view of a non-locking state (neutral state). It is a vertical side view of a locked state. It is the isolation | separation perspective view which displayed all the members. It is the isolation | separation perspective view which displayed the main member. It is a separate perspective view of the principal part. (A) is the isolation | separation perspective view of the principal part, (B) is the isolation | separation top view of the principal part. (A) is the isolation | separation perspective view of the principal part, (B) is a perspective view of a bush. It is a perspective view of the principal part. It is a side view of the principal part. It is a principal part side view which shows the advantage of embodiment.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the words “front and rear”, “front”, “back”, and “left and right” are used to indicate the direction, but these words are based on the orientation of the person sitting on the rocking chair (hereinafter simply referred to as the chair). Yes. “Front view” is a state viewed from the direction facing the seated person.

(1). Outline of Chair First, an outline will be described mainly based on FIGS. The chair of this embodiment is applied to a so-called rotating chair for office use, and the chair has a leg device 1, a base 2, a seat 3, a backrest 4, a back support 5, and an armrest device 6 as main elements. .

  The leg device 1 has a leg support 7 made of a gas cylinder. The leg support 7 is fitted to the center of a leg body having a plurality of branch legs extending radially. For example, as shown in FIG. 6, the base 2 has a substantially box-like shape opened upward and is fixed to the upper end of the leg support 7. A base bracket (intermediate bracket) 8 is attached to the base 2 so as to be slidable back and forth.

  The armrest device 7 is an optional part and is detachably attached to the base 2. When the armrest device 7 is removed, a mounting hole is made in the base 2. Therefore, the mounting hole is closed with a removable resin cover 9 (see, for example, FIGS. 4 to 6).

  As shown in FIG. 4, the seat 3 includes a seat plate (seat inner shell) 10 and a seat cushion body 11 stretched on the upper surface thereof, and the seat cushion body 11 is covered with a skin material such as a cloth. Yes. A substantially front half of the seat plate 10 is attached to the upper surface of a seat receiving shell (seat outer shell) 12. The seat receiving shell 12 and the seat plate 10 are injection molded products made of a synthetic resin material such as PP (polypropylene).

  Roughly speaking, the seat plate 10 has a first portion 10a constituting the front portion and a second portion 10b constituting the rear portion, and the seat 3 is between the first portion 10a and the second portion 10b. A group of slits 13 that are long in the left-right direction is formed. A large number of slits 13 are formed around a portion where the body pressure of the seated person acts strongly (see FIGS. 4 and 5). The front and rear portions 10a and 10b are connected to each other at several slits 13 through connecting pieces.

  The portion where the group of slits 13 is provided is a kind of hinge portion, and the seat plate 10 is bent at the position of the group of slits 13. Therefore, the seat 3 has a configuration in which the first portion 3a located on the front side and the second portion 3b located on the rear side are connected. The seat receiving shell 12 can be regarded as a part of the seat 3. Alternatively, it can be said that the seat portion is constituted by the seat 3 and the seat receiving shell 12.

  For example, as shown in FIG. 4, the backrest 4 mainly includes a back cover 14, a back plate 15 attached to the front surface of the back cover 14, and a back cushion body 16 attached to the front surface of the back plate 15. ing. A skin material such as a cloth is stretched on the back cushion body 16. The back cover 14 can be rephrased as a back outer shell, and the back plate 15 can be rephrased as a back inner shell. The back cover 14 and the back plate 15 are injection molded products made of a synthetic resin material such as PP.

  The back cover 14 has a main body portion 14a that supports the back plate 15 and a forward facing portion 14b that protrudes forward from the lower end of the main body portion 14a. Accordingly, the back cover 14 has a substantially L-shaped appearance in a side view, and the forward facing portion 14 b of the back cover 14 is connected to the second portion 10 b of the seat plate 10. The back cover 14 is connected to the back support 5 so as to be able to move down and tilt.

  When a seated person leans on the backrest 4, the backrest 4 descends while being tilted backward so that the upper end is retracted and the lower end is advanced, while the seat 3 is moving forward as a whole and the second portion 3b is the first portion 3a. Tilt backwards. Details of each part will be described below.

(2). Back support / base part First, the support mechanism part such as the back support 5 and the base 2 will be described. The back support 5 of the present embodiment is formed in an L shape in side view with a pair of left and right pipe members, and a column cover 18 is attached to the back column 5 from the back side. The left and right back supports 5 are connected by a reinforcing material 5a. The back support 5 can also be an integrally molded product made of a resin material or an aluminum molded product.

  For example, as shown in FIGS. 4 and 6, the base portion of the back column 17 is fixed to the base substrate 19 fixed to the inner surface of the base 2 by welding or the like, and is further held and held by the reinforcing metal fitting 20. As described above, the base 2 has a box-like appearance opened upward, and the rear end is open. The above-described base substrate 19 is fixed to the rear inner surface by welding. For example, as shown in FIGS. 2 and 3, a receiving tube 21 that is opened up and down is fixed to the base 2 and the base substrate 19, and the upper end of the leg support 7 is fitted to the receiving tube 21 from below.

  For example, as clearly shown in FIG. 8, the left and right side plates 2 a of the base 2 are formed with elongated holes 23 in the longitudinal direction. A resin bush 24 is mounted in the elongated hole 23, and the left and right bushes 24 are A long guide shaft 25 is inserted so as to be slidable back and forth. The bush 24 is fitted into the elongated hole 23 from the outside, and has a flange 24 a that contacts the outer surface of the base 3. The guide shaft 25 is inserted through a downward bearing piece 26 provided at the rear portion of the seat receiving bracket 8.

  Then, as clearly shown in FIGS. 8B and 10, the upper and lower inner surfaces of the bush 24 are integrated with the upper inner surface and the lower inner surface in a state where the protrusions 27 are opposed to each other as an example of the braking portion described in the claims. Is formed. The lateral width dimension W2 of the protrusion 27 is smaller than the lateral width dimension W1 of the bush 24 (about half), and the distance between the projections 27 decreases toward the end faces 24b and 24c of the bush 24 as viewed from the side. It is inclined at.

  The basic dimension of the groove of the bush 24 is slightly smaller than the outer diameter of the guide shaft 25, but the distance between the upper and lower protrusions 27 is larger than the outer diameter of the guide shaft 25 in the most part of the front-rear direction. Therefore, when the guide shaft 25 hits the protrusion 27, frictional resistance is generated, whereby the guide shaft 25 is restrained from moving between the front end portion and the rear end portion. In this case, since the bush 24 is fitted in the elongated hole 23 of the base 2, the protrusion 27 is elastically deformed by the pressing action of the guide shaft 25, but the guide shaft 25 elastically deforms the protrusion 27 while the front portion of the bush 24 is inside. It is set so as to reach the end face 24b and the rear inner face 24c.

  Although the details are omitted, the front portion of the seat bracket 8 is fitted into the pocket portion provided on the lower surface of the seat plate 10 from behind, and in this state, the seat plate 10 has two left and right portions at the rear portion of the seat bracket 8. It is fastened with screws.

  For example, as clearly shown in FIG. 8, a coil spring 28 for a rocking spring that expands and contracts in the front-rear direction is disposed inside the base 2 as an example of an elastic support means for locking. On the other hand, a downward rear spring receiving support piece 29 is formed at the rear end portion of the seat receiving bracket 8. The coil spring 28 is supported from behind by a rear spring receiver support piece 29 via a rear spring receiver 30. The front end of the coil spring 28 is supported by the front wall of the base 2 via the front spring receiver 31. Accordingly, the seat bracket 8 moves forward against the coil spring 28.

  For example, as shown in FIG. 8, left and right horizontal pieces 2 b are integrally formed at the upper ends of the left and right side plates 2 a in the base 2, and a resin slide auxiliary body 33 is attached to the horizontal pieces 2 b. Yes. The slide auxiliary body 33 has a substantially groove-shaped cross section so as to hold the horizontal piece 2b. In addition, a groove-shaped holding portion 34 that wraps the slide auxiliary body 33 from the outside is formed on the left and right side portions of the seat bracket 8. When the holding portion 34 slides with respect to the slide auxiliary body 33, the seat bracket 8 slides back and forth smoothly with respect to the base 2.

  Although not described in detail, the first portion 10a of the seat plate 10 is connected to the seat receiving shell 12 by catch means composed of engaging claws, and the second portion 10a of the seat plate 10 is also engaged with the engaging claws. It is attached to the forward facing portion of the back cover 14 by a catching means in combination with a joint hole.

(3). Structure of the backrest As can be understood from FIG. 5, for example, a long groove 35 opened downward is formed in the left and right middle portion of the back cover 14, and therefore the forward portion 14b of the back cover 14 is divided into right and left. Has been. A bearing portion 36 is formed at the front end of the left and right forward portion 14 b of the back cover 14, and the left and right bearing portion 36 and the rear ends of the left and right side plates 2 a of the base 2 are connected by a guide shaft 25.

  For example, as can be understood from FIG. 4, the long groove 35 extends to a vertical halfway height position of the main body portion 14 a in the back cover 14. However, a plurality of connecting portions 37 straddling the long groove 35 are integrally formed at a midway portion in the front-rear direction of the forward facing portion 14b and a midway portion in the vertical direction of the main body portion 14a.

  For example, as shown in FIG. 5, a reinforcing bracket 38 is fixed to the upper end portion of the back column 17, and a guide pin 39 is fixed to the reinforcing bracket 38. The left and right ends of the guide pin 39 are exposed to the left and right outer sides of the reinforcing bracket 38.

  On the other hand, upper and lower longitudinal guide grooves 40 are formed on the upper portions of the left and right inner surfaces of the long groove 35 in the back cover 14 so as to face each other. A groove-shaped resin guide member 41 is fitted in the left and right guide grooves 40, and an end portion of the guide pin 39 is fitted in the groove of the guide member 41 so as to be vertically slidable. The guide member 41 is curved in a forward concave shape with a gentle curvature in a side view. The side view shapes of the inner end faces 24b, 24c of the bush 24 may be the same as the curvature of the guide shaft 25, or may be small or large. Moreover, a flat surface may be sufficient.

(3) Summary In the above configuration, in the locking state, the backrest 4 tilts backward while sinking with respect to the back support 5 having a constant posture. At the same time, the seat 3 moves forward as a whole, while the second portion 3b tilts backward with respect to the first portion 3a. When the body is raised from the locked state, the backrest 4 and the seat 3 are returned to the original state by the coil spring 28.

  The tilting range of the backrest 4 and the longitudinal movement range of the seat 3 are regulated by a stroke in which the guide shaft 25 moves inside the bush 24. However, the guide shaft 25 moves forward slightly and moves backward slightly. By hitting the protrusion 27 at a slightly previous position, frictional resistance against movement is imparted and the front inner surface 24b or the rear inner surface 24c of the bush 24 is hit in a state where the speed is reduced.

  For this reason, it is possible to prevent the user from feeling uncomfortable when the guide shaft 25 hits the bush 24 and the movement of the backrest 4 suddenly stops. Further, as described above, since the guide shaft 25 hits the front inner surface 24b or the rear inner surface 24c of the bush 24, an excessive load acts on the protrusion 27, or the guide shaft 25 is sandwiched between the upper and lower protrusions 27 and moves. There will be no inconvenience.

  Now, the long hole 23 of the base 2 has an inward flange formed by burring, and the bush 24 is supported over a wide area. When the inward flange is formed by burring, a roundness is always present at the base portion of the inward flange. In other words, a portion of the inner peripheral surface of the long hole 23 that is close to the outer surface of the base 2 is rounded in a front sectional view. Therefore, when the outer surface of the bush 24 is a flat surface, a space is formed between the outer surface of the bush 24 and the inner surface of the elongated hole 23 at a portion close to the outer surface of the base 2.

  When the guide shaft 25 comes into contact with the projection 27, the projection 27 is pressed upward and downward to try to escape. Therefore, if the projection 27 is formed to the full width of the inner surface of the bush 27, the bush 24 The outer end portion of the inner surface of the base plate 2 escapes upward and downward and bends and deforms. Then, the bush 24 is bent and deformed in the up and down direction, and a horizontal component force that pushes the outer side of the base 2 acts. As a result, the bushing 24 comes out of the long hole 23 and becomes free.

  On the other hand, in the present embodiment, the protrusion 27 has a width dimension smaller than the left and right lateral width W1 of the bush 24 so as to be located only on a portion of the inner surface of the bush 24 that overlaps the flat surface of the inward flange in the base 2. Since it is set to W2, the contact with the guide shaft 27 does not move in the direction of coming out of the base 2. This is one of the advantages of this embodiment.

  Furthermore, setting the lateral width dimension W2 of the protrusion 27 smaller than the lateral dimension W1 of the bush 24 also has a function of securing a lubricating grease holding portion. That is, the guide shaft 25 is elastically deformed so as to crush the protrusion 27 and hits the ends 24a and 24b of the bush 24. However, in this embodiment, the lateral width W2 of the protrusion 27 is smaller than the lateral width W1 of the bush 24. (Because the protrusion 27 is closer to the inside), the space 42 exists outside the protrusion 27 in a state where the guide shaft 25 has completely moved, and this space can be used as a grease reservoir. As a result, it is possible to prevent abnormal noises from being generated while ensuring a smooth movement of the guide shaft 25.

  Although details are omitted, a portion where the guide shaft 25 moves is surrounded from the outside by a pocket portion provided in the seat receiving shell (seat outer shell) 12, and grease for the guide shaft 25 and the seat receiving bracket 8 are provided. Even if grease for dropping is dropped, these are received in the pocket portion provided in the seat receiving shell (seat outer shell) 12 so that the grease does not fall on the floor. In addition, it is also possible to form a grease pool part in the inner surface of the bush 24 at a part different from the protrusion 27.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, the present invention can be applied to a synchro-type chair in which the seat moves backward (and / or tilts backward) when locking, or to a chair in which only the backrest tilts backward.

  Further, the braking means is not limited to a protrusion, and for example, a resistance applying portion made of a material having a large friction coefficient such as an elastomer is provided on the inner surface of an end portion of a bush (long hole), and the groove width dimension of the resistance applying portion is provided. It is also possible to make the diameter slightly smaller than the outer diameter of the guide shaft. It is also possible to integrally provide a buffer portion such as rubber on the front and rear inner end surfaces of the bush (or the front and rear inner end surfaces). When providing a protrusion as a braking part, it is also possible to provide a plurality of protrusions along the lateral width direction of the bush (the axial direction of the guide shaft).

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

2 base 3 seat 4 backrest 7 leg support 8 seat bracket 10 seat plate 12 seat receiving shell 23 long hole provided in base 24 bush having long hole 25 guide shaft 27 projection as an example of braking portion 28 locking spring means Coil spring as an example

Claims (3)

A seat and a backrest and a base for supporting them; at least one of the front and rear slide of the seat and the rearward tilt of the backrest is allowed, and the range in which the seat slides back and forth or The range in which the backrest tilts or both are regulated by the relative movement of the guide shaft inside the elongated hole provided in the base or another member,
A braking portion that applies resistance to the relative movement of the guide shaft at one end portion, the other end portion, or both end portions of the elongated hole is relatively moved to the end of the elongated hole. It is provided in a state that does not hinder
Chair. A rocking chair that is allowed to tilt at least after the backrest, and the tilting range of the backrest is regulated by a combination of the elongated hole and the guide shaft;
The chair according to claim 1. All or at least the front half of the seat is supported by the base so as to be slidable back and forth. The seat and the backrest are interlocked with each other so that the seat moves forward in conjunction with the backward tilting of the backrest. is doing,
The chair according to claim 2.

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