CN110584370A - Chair with detachable top - Google Patents

Abstract

The invention relates to a chair comprising: a seat support for supporting a seated user; the armrest parts are symmetrically arranged at two sides of the seat supporting part and are relatively fixed with the seat supporting part; the back support comprises an outer area and a middle area, and the outer area is provided with side edges which are arranged at intervals left and right; the back support is rigid and is positioned above the seat support part, one end of the back support is fixedly connected with the armrest part, and the other end of the back support extends upwards; the back support is configured to support and connect the upper part of the side edge of the back support piece, and the lower part of the side edge of the back support piece is suspended; the invention changes the stress point of the chair back and the stress distribution condition of the chair back and the armrests when a human body sits, so that more leaning force of the human body is directly born by the armrests when the chair back is used specifically, the force born by the chair back is relatively less, the chair back, namely the middle lower part of the back support piece can form an independent waist support, and the user feels more comfortable when sitting.

Description

Chair with detachable top

Technical Field

The invention relates to the technical field of seats, in particular to a chair.

Background

At present, a chair is available in the market, wherein armrests are symmetrically arranged on the left side and the right side, and the middle lower part of a chair back is fixedly connected with the two armrests; specifically, closed ring-shaped armrests are symmetrically arranged on two sides of a seat board of the chair, and two sides of the middle-lower part of a chair back are respectively fixedly connected with the rear sides of the two armrests.

The chair is characterized in that: when a human body sits, the back of the human body firstly contacts the chair back of the chair in the process of leaning backwards, so that the stress of the chair is firstly the middle-upper part of the chair back and then is transmitted to the armrest position downwards through the chair back; the chair back and the armrests are respectively half stressed by human body, so the middle-lower part of the chair back connected with the armrests needs to be reinforced and thickened, and meanwhile, a fastener is also necessary to fixedly connect the chair back and the armrests. The thickened chair back can meet the normal use, but increases the manufacturing cost and the transportation cost of the chair.

As shown in fig. 16 and 17, in a chair, a middle lower portion of a chair back 102 is fixedly connected with a square armrest 101, specifically, a portion extending from a rear side of the armrest 101 in a thickness direction of the armrest 101 abuts against a rear end face of the middle lower portion of the chair back 101, and the armrest 101 is fastened to the chair back 102 by a screw 105; the shape of the middle-lower part of the backrest 102 is fixed because the middle-lower part of the backrest 102 is fixedly connected with the armrests 101, but in order to improve the comfort of lumbar support, a lumbar support 103 is additionally arranged to support the lumbar region of the human body.

For example, a second chair shown in fig. 18 and 19 is also similar in structure, and the middle lower part of the chair back 108 is clamped by two armrests 107 and fixedly connected by a screw 109.

Still further, the common characteristics of the two chairs are as follows: the middle lower part of the chair back needs firmer materials due to the necessity of supporting, the size of the middle lower part of the chair back is thicker than that of the upper half part, and the shape of the middle lower part of the chair back is very single, which is only needed for fixed connection; in such a chair, the shape of the middle-lower part of the backrest is not enough to support the waist of a human body comfortably, so a lumbar support is additionally arranged at the lumbar support position of the backrest, which increases the process and cost.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the chair, so that more leaning force applied by a seated person is transmitted to the armrests from the chair back, and the armrests bear more leaning force, so that the stress of the chair back can be reduced, the requirements of testing and using are met, and the chair back can be designed to be lighter and thinner; furthermore, the lower part of the chair back, especially the waist area, is flexible, when the chair back is acted with backward force or responds to the leaning of a user, the two sides of the chair back are close to each other, so that the elastic waist clamping effect and the wrapping feeling are generated, and the leaning is more comfortable.

The technical scheme of the invention is realized as follows:

a chair, comprising:

a seat support for supporting a seated user;

the armrest parts are symmetrically arranged at the left side and the right side of the seat supporting part and respectively keep relatively fixed with the seat supporting part;

a back support configured to support a user's back and waist, said back support including an outer region and a middle region, said outer region having sides spaced left and right;

the back support is rigid and is positioned above the seat support part, one end of the back support is fixedly connected with the armrest part, and the other end of the back support extends upwards; the back support is configured to support and connect the upper part of the side edge of the back support piece, and the lower part of the side edge of the back support piece is suspended;

the lower side portions of the back support are flexible and deform to converge toward a middle of the back support when the central region is subjected to a rearward force or in response to a user leaning against.

The independent back support is arranged, and the back support is generally higher than the armrest part, so that the connecting position of the back support is changed, namely the connecting position of the back support is moved upwards, so that the back support is not directly connected with the armrest part any more, the stress on the lower part of the back support can be reduced to a certain extent, more leaning force applied by a seated person is transmitted to the armrest part from the back support, and more leaning force is born by the armrest part, so that the design of light and thin back support is facilitated; meanwhile, the lower half part of the back support member can be configured to be flexible, so that the back support member becomes more elastic when supporting the waist and the back of a human body, and particularly when the back support member is used for responding to leaning of a user, the back support member not only can elastically support the waist, but also can be folded towards the middle to generate a waist clamping effect, and the sitting experience of the user is further improved; the back support is configured to support and connect with the upper part of the side edge of the back support, the side edge is not necessarily the edge part of the back support, but also can refer to the part from the edge of the back support to the area of 5-25mm inside the back support, and more refers to the part which is beneficial to connecting with the back support at the two sides of the back support; of course, in order to improve the convenience of connection, the side edges can be provided with convex connecting parts which are connected with the back support through the connecting parts.

More specifically, the lower part of the side edge of the back support is suspended, which means that the lower part of the side edge of the back support is not in contact with the back support or the armrest part in a narrow sense, but flexible filler or flexible connection is allowed between the lower part of the side edge of the back support and the armrest part; by broad is meant the situation where the lower side portions of the back support are not rigidly connected to the back support or the armrest parts, such that the deformation of the lower side portions of the back support is not hindered.

Preferably, the armrest portion is formed in a closed loop shape as a whole, the back bracket is located outside the closed loop of the armrest portion, and one end of the back bracket is connected to the outer periphery of the armrest portion. Thus, the armrest part is not only beneficial to decoration, but also provides stable foundation support for the back support.

Preferably, the armrest portion includes: a front frame rod and a rear frame rod which are arranged along the longitudinal direction, a bottom bracket rod which is arranged along the transverse direction, and an armrest supporting piece for supporting the arm of the human body; the upper ends of the front and rear support rods are connected with the front and rear ends of the handrail support member, the lower ends of the front and rear support rods are connected with the front and rear ends of the bottom bracket rod, and the bottom bracket rod is fixedly connected with the seat support member; the back support is formed by extending the intersection of the handrail supporting piece and the rear support rod upwards. The armrest part is an independent part and is convenient to be fixedly connected with the seat supporting part; the handrail part is in a square shape, has strong stability and can bear larger backward pressure.

Preferably, the bottom bracket rod is formed with an installation plate extending in the width direction of the armrest portion, and the installation plate is fixedly connected to the seat support member. Thus, the mounting plate can be arranged at the bottoms of the two sides of the seat supporting piece, and is convenient to be fixedly connected with the seat supporting piece.

Preferably, the armrest portion includes: preceding, back hack lever and be used for supporting the handrail support piece of human arm, the upper end of preceding, back hack lever all is connected in handrail support piece, and preceding, back hack lever and handrail support piece constitute the shape of falling the U or the shape of falling V, and preceding, the lower extreme of back hack lever links to each other with seat support piece is fixed, and the back of the body support is upwards extended by handrail support piece and the intersection of back hack lever and forms. The connecting seat supporting piece can be connected, and stable support can be provided for the back support and the back supporting piece.

Preferably, the back support is a rod-shaped member. The back support is a rod-shaped piece, has a simple and elegant structure, is arranged at the rear end of the armrest part, and does not obstruct the support of the forearms and hands of the sitting person.

Preferably, the back support and the armrest part are fixedly connected through a welding mode or a fastener, and then: the back support and the armrest part are integrally formed.

Preferably, the whole height of the armrest part is 15-25cm, and the vertical height between the upper end of the back support and the upper end surface of the seat support is 35-50 cm. A certain height distance is kept between the upper end of the back support and the rear end of the handrail support, so that the fixed mounting position of the back support can be effectively moved upwards; the leaning force of the seated person is directly received by the back support and transmitted to the armrest part.

Preferably, the vertical height of the upper end of the back support and the rear end of the armrest support is 20-25 cm. The upper end of the back support is arranged at the same height position as the middle of the back of the sitting person due to the height design, so that the back support can bear more pressure applied by the back of the sitting person, the test requirement and the use requirement are met, the thin design of the connecting part of the back support and the back support is facilitated, and the whole back support has more uniformity.

Preferably, the outer area is an annular vertical frame, two side edges form two frame sides, and the upper end and the lower end of each frame side are connected through a top transverse piece and a bottom transverse piece respectively; the frame side include first frame side, the second frame side that sets up from top to bottom, first frame side and back of the body support fixed link to each other, second frame side is the arch. The back support piece is a vertical frame, and is provided with a frame side which is arranged at a left interval and a right interval, and the frame side is fixedly connected with the back support. The back support is of a frame structure which is longitudinally arranged, and mesh cloth or other flexible materials are conveniently prepared; the frame sides at the two sides are fixedly connected with the back support, so that the effect is natural. Furthermore, the first frame side positioned above is fixedly connected with the back support, so that the second frame side is liberated, and the design of the front arch of the second frame side enables the waist of the sitting person to be effectively supported when the back support is provided with the mesh cloth.

Preferably, the second frame side is flexible, and the second frame side is deformed by an external force and returns to its original shape when the external force is removed. This gives a comfortable elastic support to the waist of the human body.

Preferably, the second frame side and the bottom cross member are arranged in a suspended manner. In a natural state, the second frame side and the bottom transverse part are not connected with other parts of the seat and keep a suspended state to form an elastic waist support; when the second frame side is directly or indirectly under the action of backward external force, the second frame side is deformed to generate reset elastic force, so that a seated person feels more comfortable. More specifically, the suspended arrangement means, in a narrow sense, a case where the second frame side is not in contact with the back support or the armrest portion, but flexible filler or soft connection is allowed to exist between the second frame side and the armrest portion; by broad is meant the case that the second frame side or bottom cross member is not rigidly connected to the back rest or the armrest part or the like, such that the deformation of the second frame side or bottom cross member is not hindered.

Preferably, the central region comprises a mesh material or flexible fabric for supporting the user, the mesh material or flexible fabric being attached to the upright frame, the second frame sides being deformed and brought together medially when the central region is subjected to a rearward force or in response to the user leaning. When a user sits and leans against, if the second frame side is designed to be a plate-shaped structure, the second frame side is twisted and is close to each other, so that the waist clamping effect is generated, and the leaning feeling is more comfortable; the middle refers to the middle position of the vertical frame in the width direction.

Preferably, the bottom cross member is simultaneously caused to flex when the central region is subjected to a rearward force or in response to the user leaning against it. The second frame side and the bottom transverse part are flexible, and when a user leans against, the deformation of the bottom transverse part assists the second frame side to be folded in to wrap the waist of the user; i.e. the two ends of the bottom cross member are brought closer together with a greater or lesser change depending on the force level.

Preferably, the back support member is an integrally formed flexible plate-shaped body, two side edges of the outer region are respectively formed with a connecting part, and the connecting parts are fixedly connected with the back support; the side portions below the junction of the back support and the side edges deform and converge toward the middle when the central region is subjected to a rearward force or in response to the user leaning. The back support piece is an elastomer integrally formed by thermoplastic plastics, and when the middle area responds to the leaning of a user, the two side edges are folded to generate a waist clamping effect, so that the leaning feeling is more comfortable; also, the middle refers to a middle position in the width direction of the back support.

Preferably, the first frame side and the back support member are connected by one or more of clamping, buckling and fastener connection modes.

Preferably, the first frame side further comprises an upper section and a lower section, the lower section is fixedly connected with the back support through screws or bolts, the upper section is located above the back support, and two ends of the top transverse piece are respectively connected with the upper ends of the two upper sections. The first frame side is divided into an upper section and a lower section, the position of the lower section fixedly connected with the back support is basically at the same height as the central position of the back of a seated person when the seated person sits, the height area is stressed in a concentrated manner, and the position is designed to be the fixed connection position of the back support, so that the structure is more reasonable, the second frame side can be vacated and liberated, the position where the second frame side is located is not used as the connection area of the chair back and the armrest as in the past, and the second frame side is convenient to design as various shapes of the waist support.

Preferably, the back support is provided with a longitudinally arranged notch, and the notch is arranged to enable the back support to form a side blocking part and a rear blocking part; correspondingly, a buckling part which is matched with the notch is formed on the lower section; after the buckling part is matched with the notch, the buckling part is connected with the side blocking part through a screw or a bolt. The design ensures that the connecting part of the back support and the back support has higher degree of engagement and integration, has no sharp feeling and saves materials.

Preferably, the buckling part is formed by contracting the rear end of the lower section from back to front and contracting the side of the lower section from outside to inside, so that a step is formed at the junction of the lower section and the upper section; the section of the back bracket with the notch is L-shaped in cross section; at least two screw holes distributed up and down are arranged on the inner side surface of the side blocking part, and mounting holes are formed in the corresponding buckling part in the lateral direction; after the buckling parts are matched with the notches, the steps abut against the top ends of the side blocking parts and the rear blocking parts, the buckling parts abut against the inner side surfaces of the side blocking parts and the front end surfaces of the rear blocking parts respectively, and screws penetrate through the mounting holes and are screwed into the screw holes to be connected and fixed. Due to the design, the screws are laterally arranged on the inner side surface of the screw, and cannot be seen from the outer side, the front side and the rear side, so that the screws are hidden; meanwhile, after the lower section of the first frame side is connected with the back support, the lower section of the first frame side and the back support are integrated, so that the use requirement is met in structural strength, the appearance is free from a sharp feeling, and the aesthetic design is facilitated.

Preferably, the side edges of the outer region are fixedly connected to the back support by screws or bolts. Is convenient for disassembly and assembly.

Preferably, the side edge of the outer region is fixedly connected with the back support through at least two screws arranged in the up-down direction. The two screws are used for connection, so that the connection is more stable and cannot be loosened or shaken.

Preferably, the side edge of the outer area is fixedly connected with the back support through a first screw and a second screw, the first screw and the second screw are arranged up and down, the distance between the first screw and the upper end of the back support is 1-4cm, and the vertical distance between the second screw and the center of the upper end of the handrail supporting piece is 10-15 cm. The two screws are arranged one above the other and are positioned at the rear upper part of the upper end surface of the handrail supporting piece, and the positions of the two screws are basically as high as the middle part of the back of a seated person when the seated person sits, so that the connecting and fixing positions of the screws can bear larger pressure, and the pressure of other parts of the back supporting piece can be reduced.

Preferably, the back support is integrally arranged in a backward inclining mode, and the included angle between the back support and the plumb line is 5-20 degrees. The back support is obliquely and obliquely inclined backwards, so that the back support keeps an inclined state, a seated person can conveniently lean against the back support, and the back support accords with human engineering.

Preferably, the back support tapers from bottom to top. The connecting part of the back support and the armrest part is thick, so that the stable firmness of the connecting root is realized; the thinner part of the backrest of the back support can be integrated with the back support, thereby meeting the connection strength and being beneficial to aesthetic design.

Preferably, the back support and the armrest part are integrally molded by plastic materials. Particularly, the material can be made of PP material, so that the use strength is met, and the mass production is convenient.

Preferably, the back support and the armrest part are approximately on the same plane. Thus, the handrail part is convenient to process, and the handrail part can provide stable foundation support for the back support.

The design starting point, the idea and the beneficial effects of the invention adopting the technical scheme are as follows:

the invention is provided with the independent back support, and the back support is the part of the armrest part extending upwards, so the connecting position of the back support is changed, namely the connecting position of the back support is moved upwards, thereby the stress on the lower part of the back support can be reduced to a certain extent, more leaning force applied by a sitting person is transmitted to the armrest part from the back support, and more leaning force is born by the armrest part, thus being beneficial to the light and thin design of the back support.

Furthermore, the structural design frees the middle-lower part of the chair back, so that the middle-lower part of the chair back can be designed into a front convex waist support to support the waist of a human body, and the waist support does not need to be added or configured independently, thereby saving the cost to a certain extent.

Particularly, the stress point of the chair back and the stress distribution conditions of the chair back and the armrests are changed when a human body sits on the chair, so that more leaning force of the human body is directly borne by the armrests when the chair is used specifically, the force borne by the chair back is relatively less, the middle lower part of the chair back, namely the back support piece can be designed into an independent lumbar support without independently adding the lumbar support on the chair back, and the user can feel more comfortable when sitting on the chair; moreover, due to the structural design, the seat is novel in structure and attractive in design.

More importantly: when a user sits and leans on, the two sides of the middle lower part of the back support piece are twisted and close to each other, so that a waist clamping effect is generated, and the two sides of the waist of the human body are folded, so that the leaning feeling is more comfortable.

Drawings

FIG. 1 is a side view schematically illustrating a chair according to an embodiment 1 of the present invention;

FIG. 2 is a perspective view of a chair according to an embodiment 1 of the present invention;

FIG. 3 is a schematic perspective view of a disassembled chair according to embodiment 1 of the present invention;

FIG. 4 is a schematic perspective view of a chair according to embodiment 1 with hidden seat supports;

FIG. 5 is a schematic perspective view of a back support according to the present invention in example 1;

FIG. 6 is an enlarged view of portion a of FIG. 3;

FIG. 7 is an enlarged view of portion b of FIG. 4;

FIG. 8 is an enlarged view of section c of FIG. 5;

fig. 9 is a rear view of a frame of the present invention in which an outer region of a back support is a standing type in embodiment 1;

FIG. 10 is a side view of the back support in example 1 of the present invention;

FIG. 11 is a first perspective view of the armrest part according to embodiment 1 of the present invention;

FIG. 12 is an enlarged view of portion d of FIG. 11;

FIG. 13 is a second perspective view of the armrest part according to embodiment 1 of the present invention;

fig. 14 is a third perspective view of the armrest part according to embodiment 1 of the present invention;

FIG. 15 is an enlarged view of section e of FIG. 14;

FIG. 16 is a perspective view of a first chair of the prior art;

FIG. 17 is a schematic perspective view of a first chair in the prior art;

FIG. 18 is a schematic perspective view of a second chair of the background art;

FIG. 19 is a schematic perspective view of a second chair in the background art;

FIG. 20 is a perspective view of a chair according to the present invention in embodiment 2;

FIG. 21 is a schematic view showing the back structure of the back support in example 1 of the present invention, in which a flexible fabric or mesh is used in the middle region;

FIG. 22 is a schematic view showing the structure of a back support in embodiment 3;

fig. 23 is a schematic view showing a split coupling structure of the back support and the back bracket according to embodiment 4;

FIG. 24 is a schematic view showing the structure of an armrest part according to embodiment 5;

FIG. 25 is a schematic structural view of an armrest part according to embodiment 6;

fig. 26 is a schematic structural view of an armrest part in embodiment 7;

FIG. 27 is a top view of the chair in an unloaded condition;

fig. 28 is a schematic view of the deformation of the first frame side and bottom rails when rearward force is applied to the middle region of the back support.

The figures are numbered: a seat support 1; an armrest portion 2; an armrest support 2 a; a handrail support 2 b; front and rear frame bars 2c, 2 d; a bottom bracket rod 2 e; a mounting plate 2 f; 2g of intersection; an armrest support rear end 201; center of upper end of the armrest support 202; a back support 3; a back support upper end 3 a; a back support 4; a connecting portion 5; a notch 6; a side stopper 7; a side shield inner side surface 7 a; a back stop portion 8; the front end surface 8a of the rear baffle part; a fastening portion 9; a lower rear end 9 a; a lower section side 9 b; a step 10; a screw hole 11; a mounting hole 12; first and second screws 13 and 14; a frame side 15; upper and lower ends 15a, 15b of the frame side; a first frame side 16; an upper section 16 a; a lower section 16 b; a second frame side 17; a top cross member 18; a bottom cross-piece 19; mounting hole sites 20; a top end 21; an outer region 22; a middle region 23; the side edges 24; side upper portions 24 a; side edge lower portions 24 b; a first arrow 25; a second arrow 26; an intermediate position 27; a plug 28; a plug groove 29; a connecting portion 30; the aperture 31; a card slot 32; a screw 33; a hook 34; a clip groove 35; mounting feet 36.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below. The present invention is described in terms of the chair in a normal use state based on the description of the orientation.

The specific embodiment of the invention is as follows:

example 1: as shown in fig. 1 to 15, the present invention provides a chair comprising:

a seat support 1 for supporting a seated person, an armrest part 2 fixedly provided at a side portion of the seat support 1, the armrest part 2 having an armrest support 2a for supporting an arm of a human body and an armrest support 2b for connecting the armrest support 2a to the seat support 1; and a back support 3 fixedly connected with the armrest part 2 and gradually reduced in width from bottom to top, wherein the back support 3 is a part higher than the armrest support part 2 a; and a back support 4 fixedly connected to the back support 3 only.

Specifically, the seat support 1 is a seat support plate of a chair, which is usually a wood plate or a plate made of plastic material, and a cushion made of sponge can be arranged on the seat support 1 during use; the armrest parts 2 are symmetrically arranged at the left side and the right side of the seat supporting part 1; the armrest portion 2 is disposed generally perpendicular to the seat support 1.

The armrest portion 2 is an independent part which is conveniently connected to the seat support 1. As shown in fig. 1-4, the armrest portion 2 is in a closed loop shape, the armrest support 2a is disposed substantially horizontally and 15-25cm higher than the upper end surface of the seat support 1 to support the arm of the user, and the lower end of the armrest support 2b is fixedly connected to the seat support 1.

Furthermore, the back support 3 is approximately positioned on the same plane as the armrest support 2a and the armrest support 2 b; the handrail support 2b comprises a front frame rod 2c and a rear frame rod 2d which are approximately vertically arranged and a bottom frame rod 2e which is approximately horizontally arranged, the upper ends of the front frame rod 2c and the rear frame rod 2d are connected with the front end and the rear end of the handrail support 2a, and the lower ends of the front frame rod 2c and the rear frame rod 2d are connected with the front end and the rear end of the bottom frame rod 2e, so that the shape of the handrail part 2 is formed into a square shape, the stability is strong, and the backward pressure can be borne; more specifically, for the convenience of formation, the armrest support 2b and the armrest support 2a are integrally formed of a plastic material.

For the convenience of the connecting seat support member 1, an installation plate 2f extending along the width direction of the armrest part 2 is formed on the bottom bracket rod 2e, the installation plate 2f is positioned below the seat support member 1, a convex installation hole position 20 is arranged on the installation plate 2f, and when the seat support member is specifically installed, a screw is screwed into the installation hole position 20 and connected to the seat support member 1, so that the installation and fixation of the installation plate 2f and the whole armrest part 2 are realized.

In the present embodiment, the back frame 3 is formed by extending upward the intersection 2g of the armrest support member 2a and the rear frame bar 2 d; specifically, the back support 3 is a rod-shaped member, has a simplified structure, is arranged at the rear end of the armrest part 2, and does not obstruct the support of the forearms and hands of the seated person; and the back support 3 is rigid, and can stably support the back support 4.

The invention is provided with the independent back support 3, and the back support 3 is higher than the handrail support 2a, thereby changing the connecting position of the back support 4, namely moving the connecting position of the back support 4 upwards, so as to reduce the stress on the lower part of the back support 4 to a certain extent, transmitting more leaning force applied by a seated user to the handrail part 2 from the back support 3, and directly bearing more leaning force by the handrail part 2, thus being beneficial to the light and thin design of the back support 4.

Back support 3 and handrail portion 2 are PP material integrated into one piece in this embodiment, when satisfying the use strength, the mass production of being convenient for again. The connecting part of the back support 3 and the armrest part 2 is thick, so that the stable firmness of the connecting root is realized; the thinner part of the back support 3 can be integrated with the back support 4, which is beneficial to aesthetic design while meeting the connection strength.

A certain height distance is kept between the upper end 3a of the back support and the rear end 201 of the armrest support, so that the fixed mounting position of the back support 4 can be effectively moved upwards; the leaning force of the seated person is directly received by the back bracket 3 and transmitted to the armrest portion 2. In this embodiment, the vertical height of the upper end 3a of the back bracket to the rear end 201 of the armrest support is specifically 20-25 cm. Due to the height design, the upper end 3a of the back support is positioned at the same height position as the middle of the back of the sitting person, so that the back support can bear more pressure applied by the back of the sitting person, and meanwhile, the test requirement is met.

This makes it possible not only to make the back support 4 thinner and lighter overall, but also to make the connecting portion 5 of the back support 4 and the back bracket 3 thinner relative to the background art, as shown in fig. 3. In addition, the back support 3 is integrally arranged in a backward inclining mode, specifically, the included angle between the back support 3 and the plumb line is 5-20 degrees, and in the embodiment, the included angle between the back support 3 and the plumb line is preferably 10-15 degrees; the back support 3 is arranged obliquely and obliquely backwards, so that the back support 4 keeps an oblique state, a seated person can lean against the back support conveniently, and the human engineering is met.

As shown in fig. 9 and 21, the back support 4 includes an outer region 22 and a middle region 23, the outer region 22 has two side edges 24 spaced left and right, and the two side edges 24 are respectively fixedly connected to the back frame 3; specifically, the upper side portion 24a is fixedly connected to the back frame 3 in a partial region thereof, and the lower side portion 24b is suspended.

In this embodiment, the back support 4 is an annular vertical frame having a frame side 15 spaced from the left and right, the frame side 15 is a side 24 of the outer region 22, the frame side 15 is fixedly connected to the back frame 3 by first and second screws 13, 14, the first and second screws 13, 14 are arranged one above the other, the distance between the first screw 13 and the upper end 3a of the back frame is 1-4cm, and the vertical distance between the second screw 14 and the center 202 of the upper end of the armrest support is 10-15 cm. The two screws are arranged one above the other and are both positioned at the rear upper position of the upper end surface of the handrail support 2a, and the positions of the two screws are basically at the same height as the middle part of the back of a seated person when the seated person sits, so that the connecting and fixing positions of the screws can bear larger pressure, and the pressure of other parts of the back support 4 can be reduced.

In detail, as shown in fig. 21, the outer region 22 of the back support 4 is of a longitudinally disposed annular frame-like construction, which is integrally made of thermoplastic and which is fixedly connected to the back support 3 via the frame sides 15 on both sides. The upper and lower ends 15a, 15b of the two frame sides 15 are connected by a top cross member 18 and a bottom cross member 19, respectively; while the central region 23 is formed of a flexible fabric for supporting the user, it may of course be woven from a mesh material; the edges of the middle region 23 are attached to the two frame sides 15 and the top and bottom cross pieces 18, 19.

As shown in fig. 9 and 10, the frame side 15 includes a first frame side 16 and a second frame side 17 which are arranged up and down, in this embodiment, a side upper portion 24a, i.e., the first frame side 16, and a side lower portion 24b, i.e., the second frame side 17; the first frame side 16 is fixedly connected with the back bracket 3, and the second frame side 17 is in an arch shape protruding forwards. With such a design, the first frame side 16 positioned above is fixedly connected with the back support 3, so that the second frame side 17 is liberated, and the front arch design of the second frame side 17 can effectively support the waist of a seated person when the back support 4 is provided with flexible fabrics such as mesh fabrics; the second frame side 17 and the bottom cross-piece 19 are both flexible, the bottom cross-piece 19 can be designed as a thin sheet or plate which is forced to bend and return to its original shape when the external force is removed, while the second frame side 17 is also designed as a thin sheet or plate which is deformed by the external force in the backward direction and returns to its original shape when the external force is removed. This gives a comfortable elastic support to the waist of the human body.

More specifically, in a specific application, the second frame side 17 and the bottom cross member 19 are suspended. In the natural state, the second frame side 17 and the bottom cross-piece 19 are not connected with other parts of the seat and keep in a suspended state to form an elastic lumbar support; fig. 27 shows a schematic top view of the seat in unloaded condition, in which the second frame side 17 and the bottom cross-member 19 are arranged along the width of the back support 4, in particular in the case of the second frame side 17, which has a width substantially greater than its thickness, for example a width greater than 6 times the thickness, for example a thickness of 1.5-2.5mm and a width of 15-25 mm; when a user sits against the central region 23 with a rearward force, as shown in fig. 28, i.e. the first arrow 25 indicates the direction of the force applied to the central region 23, the second frame side 17 is torsionally deformed and drawn together towards the middle position 27 of the back support 4 in the width direction, as indicated by the second arrow 26, and at the same time the bottom cross-piece 19 is also bent and deformed, the two ends of the bottom cross-piece 19 being drawn together to assist the deformation of the second frame side 17; thus, the torsional deformation of the second frame side 17 cooperates with the central region 23 to provide a grip on both sides of the user's waist, creating a lumbar grip effect that makes the seated user feel more comfortable.

Of course, the second frame side 17 may also be designed to be rod-shaped according to the requirement, i.e. the width is substantially equal to the thickness, and at this time, the deformation of the second frame side 17 is a deformation in the left-right direction, i.e. in the width direction of the back support, and also shows a tendency of closing the waist. Regardless of whether the second frame side 17 is designed to be rod-shaped or plate-shaped, when a force is applied in the direction of the first arrow 25 as shown in fig. 28, the second frame side 17 is also elastically deformed backward at the same time, and forms elastic support in the front-rear direction.

In still further detail, the first frame side 16 is connected to the back support 3 in the following manner: as shown in fig. 5, 9 and 10, the first frame side 16 further includes an upper section 16a and a lower section 16b, the lower section 16b is fixedly connected to the back frame 3 by the first and second screws 13 and 14, the upper section 16a is located above the back frame 3, and two ends of the top cross member 18 are respectively connected to upper ends of the two upper sections 16 a. The position of the lower segment 16b of the first frame side 16 fixedly connected with the back support 3 is basically at the same height as the central position of the back of the seated person when the seated person sits, the height area is stressed in a concentrated manner, and the position is designed to be the fixed connection position of the back support 4, so that the structure is more reasonable, the second frame side 17 can be vacated and liberated, the position of the second frame side 17 is no longer used as the connection area of the chair back and the armrest as in the past, and various modeling designs of the second frame side 17 as the waist support are facilitated.

More specifically, the back support 3 is provided with a longitudinally arranged notch 6, and the notch 6 is arranged to enable the back support 3 to form a side blocking part 7 and a rear blocking part 8; correspondingly, an engaging part 9 which is matched with the notch 6 is formed on the lower section 16b of the first frame side 16; after the buckling part 9 is matched with the notch 6, the buckling part 9 is connected with the side blocking part 7 through a first screw 13 and a second screw 14. The design ensures that the conjunction degree and the integration degree of the connecting part of the back support 3 and the back support 4 are higher, and the material is saved.

Of course, the first frame side 16 and the back frame 3 can also be fastened together, as shown in fig. 5, 8 and 9, the fastening portion 9 of the first frame side 16 of the back support 4 is provided with a plurality of plugs 28, and as shown in fig. 11, 12 and 15, a plurality of insertion grooves 29 are correspondingly provided at corresponding positions of the back frame 3, such as the side blocking portions 7, and the plugs 28 are inserted into the insertion grooves 29; at this time, the primary connection and positioning are realized by the cooperation of the plug and the inserting groove, and if the primary connection and positioning are realized by adopting the mode, the first frame side 16 and the back bracket 3 can also be connected and fixed by only adopting one screw. Furthermore, easily conceivable ways are: the plug 28 can also be arranged on the back bracket 3, while the plug-in slot 29 is arranged opposite the first frame side 16 of the back support 4.

More specifically, as shown in fig. 5 and 8, the engaging portion 9 is formed by the lower rear end 9a contracting from back to front and the lower lateral side 9b contracting from outside to inside, so as to form a step 10 at the boundary between the lower section 16b and the upper section 16 a; the section of the back bracket 3 with the notch 6 is L-shaped in cross section; two screw holes 11 distributed up and down are arranged on the inner side surface 7a of the side blocking part, and mounting holes 12 are correspondingly formed in the upper side of the buckling part 9 in a lateral direction; after the buckling part 9 is matched with the notch 6, the step 10 is abutted against the top ends 21 of the side blocking part 7 and the rear blocking part 8, the buckling part 9 is abutted against the inner side surface 7a of the side blocking part and the front end surface 8a of the rear blocking part respectively, and the first screw 13 and the second screw 14 penetrate through the mounting hole 12 and are screwed into the screw hole 11 to realize connection and fixation. Due to the design, the screws are laterally arranged on the inner side surface, and the screws cannot be seen from the outer side, the front side and the rear side, so that the screws are hidden; meanwhile, after the lower section 16b of the first frame side 16 is connected with the back support 3, the two are integrated into a whole, so that the structural strength meets the use requirement, the appearance is not sharp, and the aesthetic design is facilitated.

After the assembly of the seat is completed, the mesh cloth is arranged on the back support 4; when specifically using, because second frame side 17 is the shape of preceding arch, consequently second frame side 17 cooperates the screen cloth of this department to form the waist and leans on, and human waist leans on when heeling back to the waist leans on the pressure application, because second frame side 17 is unsettled setting, so can produce elastic deformation, provides the restoring force, forms effectual elastic support.

Example 2: as shown in fig. 20, the difference from embodiment 1 lies in that the handrail support 2b in this embodiment includes front and rear frame bars 2c and 2d, the upper ends of the front and rear frame bars 2c and 2d are connected to the front and rear ends of the handrail support 2a, the front and rear frame bars 2c and 2d and the handrail support 2a form a U shape with an opening facing downward, the lower ends of the front and rear frame bars 2c and 2d are fixedly connected to the seat support 1, and the back frame 3 is formed by extending upward at the intersection of the handrail support 2a and the rear frame bar 2 d. The armrest part is U-shaped and is fixedly connected with the seat supporting part 1, and the support for the arm and the back supporting part 4 can be realized.

Example 3: as shown in fig. 22, the present embodiment is different from embodiment 1 in that: the back support 4 is a flexible plate-shaped body which is integrally molded by thermoplastic plastics, connecting parts 30 are respectively formed on the upper parts 24a of the two side edges 24 of the outer area 22, and the connecting parts 30 are fixedly connected with the back bracket; when the middle region 23 is subjected to a rearward force or in response to a user leaning on, the side portions below the back frame and side connecting portions 5, i.e., the side lower portions 24b, are deformed and drawn toward the middle; the connection of the connection part 30 and the back frame is the same as in embodiment 1.

Still further, a plurality of grid-shaped holes 31 are distributed over the central area 23 of the back support 4.

Example 4: as shown in fig. 23, the present embodiment is different from embodiment 1 in that: back support 3 and back support piece 4 adopt the joint mode to link to each other, are equipped with draw-in groove 32 on back support piece 3 promptly, set up on the side 24 of back support piece 4 with draw-in groove 32 joint complex connecting portion 30, behind draw-in groove 32 is gone into to connecting portion 30 card, in order to increase safety in utilization and firm in connection nature, rethread screw 33 connects back support 3 and connecting portion 30.

Furthermore, the connecting portion 30 is further provided with a hook 34, and correspondingly, a clamping groove 35 matched with the hook 34 is arranged in the clamping groove 32, and the hook 34 is clamped into the clamping groove 35 by utilizing the elastic deformation of the hook 34.

Example 5: as shown in fig. 24, the present embodiment is different from embodiment 1 in that: the armrest part 2 is in a U shape with a forward opening, the armrest supporting part 2a is approximately horizontally arranged and is 15-25cm higher than the upper end surface of the seat supporting part 1 so as to conveniently support the arm of a user, and the lower end of the armrest supporting part 2b is fixedly connected with the seat supporting part 1.

Specifically, the handrail support 2b includes a rear support bar 2d disposed substantially vertically and a bottom support bar 2e disposed substantially horizontally, an upper end of the rear support bar 2d is connected to a rear end of the handrail support 2a, and a lower end of the rear support bar 2d is connected to a rear end of the bottom support bar 2 e; more specifically, for convenience of formation, the armrest support 2b and the armrest support 2a are integrally formed by using a plastic material; and the armrest part 2 is rigid.

For the convenience of the connecting seat support member 1, an installation plate 2f extending along the width direction of the armrest part 2 is formed on the bottom bracket rod 2e, the installation plate 2f is positioned below the seat support member 1, a convex installation hole position 20 is arranged on the installation plate 2f, and when the seat support member is specifically installed, a screw is screwed into the installation hole position 20 and connected to the seat support member 1, so that the installation and fixation of the installation plate 2f and the whole armrest part 2 are realized.

The back bracket 3 is formed by extending upwards the intersection 2g of the handrail supporting piece 2a and the rear bracket rod 2 d; specifically, the back support 3 is a rod-shaped member, has a simplified structure, is arranged at the rear end of the armrest part 2, and does not obstruct the support of the forearms and hands of the seated person; and the back support 3 is rigid, and is integrally formed with the armrest part 2, so that the back support can be stably supported.

Example 6: as shown in fig. 25, the present embodiment is different from embodiment 1 in that: the armrest support 2b is substantially triangular, the rear end of the armrest support 2a is connected to the upper portion of the armrest support 2b, the back support 3 is also connected to the upper end of the armrest support 2b, and the back support 3 is formed by extending the upper end of the armrest support 2b obliquely and upwardly. The connecting position of the back support 3 and the armrest support 2b and the connecting position of the armrest support 2a and the armrest support 2b may be the same or different.

The back support 3 and the handrail support 2b can be fixedly connected through a fastener or integrally formed.

Example 7: as shown in fig. 26, the difference from embodiment 6 is: in this embodiment, the armrest support 2b is substantially inverted V-shaped, and two mounting legs 36 connected to the seat support are formed at the lower end of the armrest support 2b, and the rear end of the armrest support 2a is connected to the front side of the upper portion of the armrest support 2 b; and the back support 3 is connected to the upper rear side of the handle support 2 b.

Of course, the back support 3 may be connected to the armrest support 2b at the same position as the armrest support 2 a.

The above description of the present invention is intended to be illustrative. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (25)

1. A chair is characterized by comprising:

a seat support for supporting a seated user;

the armrest parts are symmetrically arranged at the left side and the right side of the seat supporting part and respectively keep relatively fixed with the seat supporting part;

a back support configured to support a user's back and waist, said back support including an outer region and a middle region, said outer region having sides spaced left and right;

the back support is rigid and is positioned above the seat support part, one end of the back support is fixedly connected with the armrest part, and the other end of the back support extends upwards; the back support is configured to support and connect the upper part of the side edge of the back support piece, and the lower part of the side edge of the back support piece is suspended;

the lower side portions of the back support are flexible and deform to converge toward a middle of the back support when the central region is subjected to a rearward force or in response to a user leaning against.

2. The chair according to claim 1, wherein: the whole armrest part is in a closed loop shape, the back support is positioned outside the closed loop of the armrest part, and one end of the back support is connected to the periphery of the armrest part.

3. The chair according to claim 2, wherein: the armrest part comprises: a front frame rod and a rear frame rod which are arranged along the longitudinal direction, a bottom bracket rod which is arranged along the transverse direction, and an armrest supporting piece for supporting the arm of the human body; the upper ends of the front and rear support rods are connected with the front and rear ends of the handrail support member, the lower ends of the front and rear support rods are connected with the front and rear ends of the bottom bracket rod, and the bottom bracket rod is fixedly connected with the seat support member; the back support is formed by extending the intersection of the handrail supporting piece and the rear support rod upwards.

4. A chair according to claim 3, wherein: the bottom bracket rod is provided with a mounting plate extending along the width direction of the armrest part, and the mounting plate is fixedly connected with the seat supporting part.

5. The chair according to claim 1, wherein: the armrest part comprises: preceding, back hack lever and be used for supporting the handrail support piece of human arm, the upper end of preceding, back hack lever all is connected in handrail support piece, and preceding, back hack lever and handrail support piece constitute the shape of falling the U or the shape of falling V, and preceding, the lower extreme of back hack lever links to each other with seat support piece is fixed, and the back of the body support is upwards extended by handrail support piece and the intersection of back hack lever and forms.

6. A chair according to any one of claims 1 to 5, wherein: the back support is a rod-shaped piece.

7. The chair according to claim 1, wherein: back of the body support passes through welding mode or fastener fixed connection with handrail portion, again or: the back support and the armrest part are integrally formed.

8. A chair according to claim 3 or 5, wherein: the integral height of the armrest part is 15-25cm, and the vertical height of the upper end of the back support and the upper end surface of the seat support is 35-50 cm.

9. A chair according to claim 3 or 5, wherein: the vertical height between the upper end of the back support and the rear end of the handrail support is 20-25 cm.

10. The chair according to claim 1, wherein: the outer area is an annular vertical frame, two sides form two frame sides, and the upper end and the lower end of each frame side are connected through a top transverse piece and a bottom transverse piece respectively; the frame side include first frame side, the second frame side that sets up from top to bottom, first frame side and back of the body support fixed link to each other, second frame side is the arch.

11. The chair according to claim 10, wherein: the second frame side is flexible, deforms under the action of external force, and recovers the original shape when the external force disappears.

12. The chair according to claim 10, wherein: and the second frame side and the bottom transverse part are both arranged in a suspended manner.

13. The chair according to claim 10, wherein: the central region comprises a mesh material or flexible fabric for supporting a user, the mesh material or flexible fabric being attached to the upright frame, the second frame sides being deformed and drawn towards the middle when the central region is subjected to a rearward force or in response to a user leaning against.

14. The chair according to claim 10, wherein: the bottom cross member is simultaneously caused to flex when the central region is subjected to a rearward force or in response to the user leaning.

15. The chair according to claim 10, wherein: the back support piece is an integrally formed flexible plate-shaped body, connecting parts are respectively formed on two side edges of the outer area, and the connecting parts are fixedly connected with the back support; the side portions below the junction of the back support and the side edges deform and converge toward the middle when the central region is subjected to a rearward force or in response to the user leaning.

16. The chair according to claim 10, wherein: the first frame side and the back support piece are connected through one or more combinations of clamping, buckling and fastener connection modes.

17. A chair according to claim 10 or 16, wherein: the first frame side comprises an upper section and a lower section, the lower section is fixedly connected with the back support through screws or bolts, the upper section is located above the back support, and two ends of the top cross rod are connected with the upper ends of the two upper sections respectively.

18. The chair according to claim 17, wherein: the back support is provided with a longitudinally arranged notch, and the back support forms a side blocking part and a rear blocking part due to the arrangement of the notch; correspondingly, a clamping part which is matched with the notch is formed on the lower section; after the clamping portion is matched with the notch, the clamping portion is connected with the side blocking portion through a screw or a bolt.

19. The chair according to claim 18, wherein: the clamping part is formed by shrinking the rear end of the lower section from back to front and shrinking the side of the lower section from outside to inside, so that a step is formed at the junction of the lower section and the upper section; the section of the back bracket with the notch is L-shaped in cross section; at least two screw holes distributed up and down are arranged on the inner side surface of the side blocking part, and mounting holes are formed in the corresponding clamping part in the lateral direction; after the clamping portion is matched with the notch, the step is abutted to the top ends of the side blocking portion and the rear blocking portion, the clamping portion is abutted to the inner side face of the side blocking portion and the front end face of the rear blocking portion respectively, and the screw penetrates through the mounting hole and is screwed into the screw hole to be connected and fixed.

20. The chair according to claim 1, wherein: the side edge of the outer area is fixedly connected with the back bracket through screws or bolts.

21. The chair according to claim 20, wherein: the side edge of the outer area is fixedly connected with the back support through at least two screws which are distributed in the vertical direction.

22. The chair according to claim 21, wherein: the side edge of the outer area is fixedly connected with the back support through a first screw and a second screw, the first screw and the second screw are arranged one above the other, the distance between the first screw and the upper end of the back support is 1-4cm, and the vertical distance between the second screw and the center of the upper end of the handrail supporting piece is 10-15 cm.

23. The chair according to claim 1, wherein: the back support is integrally arranged in a backward inclining mode, and the included angle between the back support and the plumb line is 5-20 degrees.

24. A chair according to claim 1, 6 or 7, wherein: the back support is gradually thinned from bottom to top.

25. The chair according to claim 1, wherein: the back support and the armrest part are approximately positioned on the same plane.