CN2069687U - Foldable chair capable of being attached to the bicycle or set on the ground - Google Patents

Abstract

The utility model relates to a foldable chair capable of being attached to the bicycle or set on the ground. The utility model is characterized in that the chair feet which can be folded are symmetrically distributed on both sides of the axle wire of a chair. After the utility model is folded inwards, two front chair feet are intersected with the slanting lever of the bicycle; more than two U-shaped cambered surface plug-in cards which can be clamped and fixed on the transversal rod of the bicycle without installing and disassembling by tools are fixedly connected to the axle wire of the bottom surface of the chair seat. The serial products such as a foldable handrail chair, a fixing handrail foldable chair, a handrail backrest adjustable foldable chair, and a circle-type fixing backrest feet-folding chair which are used on the bicycle and the ground can be produced by the structure. The folding volume is within 28*30*9 centimeters, and the weight is lower than 2 kilograms. The foldable chair capable of being attached to the bicycle or set on the ground is suitable for being used for children on the bicycle or on the ground, and the foldable chair capable of being attached to the bicycle or set on the ground is also suitable for adults to carry to be sat.

Description

Foldable chair capable of being attached to the bicycle or set on the ground

The utility model relates to a kind of folding seat, refers to especially be suitable on the bicycle and the dual-purpose folding seat in ground.

In the existing folded seat of being made up of seat support, collapsible backrest, collapsible chair pin, the folding S. A. of chair pin and backrest is all vertical with the axis of seat.The reinforcing crosspiece of two pairs of chair pin and above-mentioned rotating shaft parallel.As they are placed on the bicycle rack, the reinforcing crosspiece and the rotating shaft of two pairs of chair pin all are clipped between bicycle rack and the seat support, and the seat support bottom surface seat support registration device that horizontal cross moves on vehicle frame without limits.Therefore this class folded seat can not be used on bicycle by frame.Their seat support is by independent hardboard or fix superimposed by seat frame, seat board, seat cushion.Or sew up by seat frame, spring, cushion and to form one.Can only be single seat with its hard seat or soft seat.What for example Chinese patent ZL85 2 05046 ZL86 2 01132 proposed promptly is such technical scheme.Because bicycle has become the short distance traffic instrument of the maximum of developing country, therefore folded seat is placed on the bicycle as the technical scheme of carrying child seat, caused that people note widely, up to the present, the existing many patents of this technical field get the Green Light.For example Chinese patent ZL86 2 05545, ZL87 2 00390 frame that proposed to have latching system the folded seat on the bicycle rack whippletree, number of patent application 89 2 127767 propose will have the folded seat of fence to hang on the lady's bicycle handle with hook or the back clothes hanger on design, number of patent application 88 2 09,564 1 propositions the technical scheme that movable cross bar is used latching system fixed fold chair again is set on lady's bicycle.But above-mentioned patent all only is conceived to folding seat support is put into the registration device on the bicycle and the design of safe building enclosure.But there be not 3-4 the chair pin that must have in the known seat.Therefore do not possess to pull down and be placed on ground and make the compatibility that common chair uses, limited the range of use of this class folded seat from bicycle.The time spent does not also need parking space; And the structure more complicated, needing just to put bicycle and use through the mounting or dismounting attaching parts, cost is also higher, is difficult to penetration and promotion.

In view of the above-mentioned deficiency of prior art, the purpose of this utility model is to design a kind of form and function of existing known folded seat, can carry children on whippletree or the back clothes hanger before bicycle rack without the convenient frame firmly of instrument again.Simple in structure firmly cost is low, and is in light weight, and folding volume minimum is convenient to flow and is carried, and all can sit on the bicycle of usefulness child adult who is easy to develop tandem product on the major technique feature base and dual-purpose folding seat in ground or folding armchair.

The utility model is achieved in that in the folded seat that basic structure is made up of seat support, collapsible chair pin and collapsible backrest, the axis A-A of seat support bottom surface is provided with the pintle hook lock element ∩ shape cambered surface plug-in card (7) that is used to insert the bicycle rack whippletree more than 2, and two pairs of chair pin (9) are symmetrically distributed in the both sides of seat axis vertical guide.Be fixed on the bottom surface of supporting brace panel (16) of the substrate seat frame (1) of seat support.Approximate this axis vertical guide that is parallel to of chair pin rotating shaft (11).When above-mentioned dual-purpose folding chair was put the bicycle rack whippletree, ∩ shape cambered surface plug-in card (7) does not assemble can block whippletree.Seat can not transverse slip, again will be across two pairs of chair pin (9) of whippletree both sides invagination simultaneously, when folding to separately the forward foot in a step intersects with the bicycle rack slash, this infall is tightened with gentle rope or snap close.Or with substantially parallel two pairs of chair pin reinforcing crosspieces (10) fixing.Make two front chair legs clamp the bicycle rack slash, then form the location structure that three vertical guides overlap.It is the vertical guide that seat axis vertical guide, bicycle whippletree one slash are formed.The two pairs of chair pin are the axis vertical guide of the isometric hypotenuse seat support equilateral del that is horizontal top margin.The coincidence of such three vertical guides.Make seat can not whippletree on axial motion and radially rotating.Simultaneously, because the ∩ shape cambered surface plug-in card (7) more than 2 is inserted in the certain-length of whippletree, seat also just can not horizontally rotate on whippletree, can be at the seat that is fixed on the whippletree with also being placed on the dual-purpose purpose of sitting usefulness on the ground so reached seat.

Seat support of the present utility model by as substrate the seat frame (1) and on seat board (2), the movable closed assembly of seat cushion (3) combine.Seat frame (1) is bent by shape.Section bar cross section and molding mode guarantee 75 kilograms of stiff stabilities of design load, the rear end of seat frame (1) dual-side (6) respectively bends up one section and goes up curved extension, last angle coupling angle 90-100 °, the length 3-3 of upper curved section centimetre, block when the little angle steel of a punching press of top welding is swung back as backrest, the another side that connects this upper curved section angle promptly has hole, a garden in seat frame side (a 6) rear end, the distance that makes this hole to angle summit just and the axis hole on the backrest clubfoot be harmonious.In order to insert backrest rotating shaft (22), form folding movable hinge of backrest.The frame back welding has two above metal support brace panels (16), with the rigidity of reinforced seat frame (1) and as the fixed base of chair pin pin card (8) with handrail socket (15).Seat board (2) is made by plank or hard plastic board, can embed a frame (1) separately and fix as hard seat with screw thread.Or with a seat board (2) and seat cushion (a 3) composition one embedding seat frame (1), with screw thread that seat board (2) is fixing as cushion.Also the fabricate block activity of this seat board (2) with seat cushion (3) can be embedded in the frame (1), turn-over uses, and day heat is sat hardboard, soft of day cold seat.

Fix member ∩ shape cambered surface plug-in card (7), make, also can cast type soft material protection again outward with iron punching press or essence by non-metals that is lower than baking finish hardness or thermoplastic plastic.Its inboard cambered surface is that the two ends of half garden arc respectively have one section straight flange tangentially to extend, and its garden arc radius and segmental arc total length and bicycle rack whippletree diameter adapt.The cambered surface top is gone up and is horizontal strip plane.With bonding, be threaded or electric welding is fixed in this plane on the axis, bottom surface of a frame (1), seat board (2); Make ∩ shape opening down, the location spacing of the ∩ shape cambered surface plug-in card (7) more than 2 is adapted to the inside neutral gear distance of bicycle rear rack.

Chair pin (9) is reinforced crosspiece (10) by high-strength thin-walled steel pipe weldering with first steel chair pin and is reinforced in pairs, rubber and plastic sheath or tipping universal rolling wheel are inserted in the bottom, the upper end is flattened and is gone out slotted hole, insert in the middle of the straight clamping plate in U font both sides of U-shaped pin card (8), chair pin rotating shaft (11) runs through the hinge of hole, garden and the slotted hole composition chair pin activity of chair pin upper end in these two clamping plate.The clamping plate top, both sides of this U-shaped pin card (8) is connected with the top flat board with 84-90 ° of clamping plate angle, connect the direction of U-shaped opening towards seat axis vertical guide, with arbitrary mode of welding, riveting, boning or being threaded, this flat board is fixed in the below of the supporting brace panel (16) of a frame (1) bottom surface.Make two pairs of chair pin (9) be symmetrically distributed in both sides, seat axis.When the slotted hole of chair pin upper end is pulled out U-shaped clamp plate outside.Two pairs of chair pin get final product invagination, and sole separately and axis vertical guide intersect the chair pin angle of 55-65 ° of formation; Slotted hole inserts in two clamping plate, then chair pin upper end flat part is blocked the location by chair pin rotating shaft (11) and half garden shape concave surface subtend of U-shaped clamp plate, two pairs of chair pin (9) can be placed on the ground, and each forms 84-90 ° angle with ground, can stably support the human body weight on the seat support.Backrest (4) bends housing with metal tube or shape, is welded into the macropore grid with metal filament in the frame, and surperficial spraying plating is decorated protective cover or added the cover cushion.The lower end of two upright frames of backrest housing (5) bends up one section short clubfoot towards seat the place ahead, its crooked angle be 90-100 ° this be the elevation angle, maximum back of backrest, hole, a garden is opened in the clubfoot end, makes with the hole, garden of seat frame side (6) superimposed.In this two hole, penetrate backrest rotating shaft (22) and form the folding hinge of backrest.Clubfoot length is decided on the seat of seat and the superimposed thickness of backrest cushion, is as the criterion with applying above the seat support to guarantee the folding back of backrest.

Architectural feature based on above-mentioned seat support, chair pin, backrest and plug-in card element ∩ shape cambered surface plug-in card is provided with a pair of movable hand rail, forms another product of the same inventive concept of the utility model: reach the dual-purpose folding armchair in ground on the handrail disassembly and assembly type bicycle.It by the handrail panel (12) of level, vertical affixed handrail panel cramp bar (13) with panel, with the movable handrail pin (14) that is hinged of cramp bar, and the handrail socket (15) of affixed present frame (1) bottom surface, form dismantled and assembled folding movable hand rail.Panel cramp bar (13) curves square by shape, and its horizontal right angle minor face and metal handrail panel (12) are affixed with screw thread or electric welding, becomes the upper semisection of Foldable handrail, and the bottom on its long limit, vertical right angle has slotted hole and reaches

Mouthful; Handrail pin (14) by the laterally short Metallic rod in two upright parallel metal clamping plate and lower end affixed become angle under the right angle, upright clamping plate have two holes up and down, last hole connects with the slotted hole that inserts the handrail panel cramp bar (13) in it, become the activity of handrail to be hinged their rivetings with handrail rotating shaft (17), following hole penetrates handrail fix shaft (18) rivet clasp on two upright clamping plate.Become under the handrail upper semisection and to insert and the lower end of slotted hole handrail panel cramp bar (13) when moving down

The fixing axle of mouth makes the handrail vertical orientation.Handrail socket (15) is metal section or the rammed Ω shape of steel plate part, and is affixed with the supporting brace panel (16) of seat frame bottom surface, inserts or pulls out for handrail pin (14), to regulate the width of handrail.As handrail pin (14) and handrail socket (15) is affixed, still keep the revolved folding endurance of handrail epimere, then form another kind of like product fixed armrest dual-purpose folding chair.Handrail rotating shaft (17) that handrail panel cramp bar (13) in above-mentioned two kinds of folding chairs is connected with handrail pin (14) and handrail fix shaft (18) all are parallel to the axis of seat.

Based on above-mentioned basic structural feature, the handrail that a pair of scalable height inclination angle is set and flexibly connects with backrest.Constitute the another kind of product of the same design of the utility model: reach ground dual-purpose handrail adjustable backrest folded seat on the bicycle.It is movably hinged the four connecting rod movable hand rails of forming parallelogram by one section of lower end and (6) four sections rod members of a frame side of horizontal handrail angle bar (19), upright preceding fagging (20), the upright frame of backrest (5).Pin joint on the forward direction of this four connecting rod.Concentric hinged handrail regulating plate (21).Have 3 with the adjusted knock hole on the regulating plate (21), upright preceding fagging (20) lower end is articulated in a front end of edge side (6); The upper end is hinged with horizontal handrail angle bar (19), handrail regulating plate (21), and the rear end of horizontal handrail angle bar (19) and the upright frame of backrest (5) are hinged.Make its node equal the length of upright preceding fagging (20) with the length of the straight frame (5) of next section; Above-mentioned three handrail elements (19), (20), (21) are stamping forming metal sheet.The backrest clubfoot is hinged with seat frame side (6) back segment, and make the backrest rotating shaft (22) of passing this hinge hole expose the 3-5 millimeter, when the different adjustment knock hole of handrail regulating plate (21) is buckled in wherein, what affect the parallelogram handrail is preceding when going up the angle, handrail height is promptly by flexible, change the inclination angle of upright preceding fagging (20), also affect backrest (4) to do the adjustment of the corresponding elevation angle simultaneously seat support.

Architectural feature based on above-mentioned seat support, collapsible chair pin, collapsible backrest and ∩ shape cambered surface plug-in card, change collapsible backrest into enclosure shape fixedly backrest, form another product of the same design of the utility model: reach fixedly backrest folding pin seat for children of the dual-purpose enclosure formula in ground on the bicycle.Enclosure formula fixedly backrest circle is welded in the backrest circle on the arc segmental arc of a left side, the back of a frame (1), right three-dimensional with the fine wire of different length more than 5 by curving half moon than thicker wire.The seat frame curves the half moon of forward direction straight line, and the radius of curvature of the half moon segmental arc of backrest is greater than the radius of curvature of seat frame (1) segmental arc.

By the above-mentioned basical traditional model of not adorning handrail that the utility model proposes with have reassembling type stow-away arm rest, fixed fold handrail, handrail adjustable backrest and enclosure formula fixedly on the backrest bicycle and the dual-purpose folding seat series of products in ground, owing to architectural feature and connection location thereof that ∩ shape cambered surface plug-in card (7) is provided.With the folding rotating shaft of two pairs of chair pin is arranged the chair pin rotating shaft half-twist of existing folding chair.And be equipped with other attaching parts corresponding structure features.The fixing structure conflict that stops with the chair pin of seat support when having solved existing band pin folding chair and putting bicycle, make seat can without instrument stably frame on bicycle, carry children, can strut the chair pin again and be put in ground and use, overcome the shortcoming that existing folding chair can not car ground dual-purpose as known seat.Simultaneously from the less usage condition in bicycle space.The oad of dual-purpose folding chair of the present utility model is inevitable less.For example volume after folding is only 28 * 28 * 9 centimetres.Provide the structure possibility for using small bore metal pipe material and section bar to guarantee to have 75 kilograms of carrying stiff stabilities again, reached simple in structure, few with material, volume is little, thereby in light weight, and cost is low.The purpose of being convenient to flow and carrying and deposit, though its size is little, seat support still can reach the critical dimension that the adult can comfortable seat usefulness, it respectively has the characteristics in the use by the various folding chair with armrest that basic structure derives from.After mounting or dismounting handrail-type folding chair is loaded onto handrail, child can sit usefulness safely, adult as sense seat are too narrow, can transfer to handrail, the width of seat support can adapt to adult's buttocks width, specializes in the fixedly dual-purpose folding chair of backrest of the dual-purpose folding chair of handrail adjustable backrest of infant's seat usefulness and enclosure formula, when the infant is sleeping on bicycle, can sleep on one's back safely, be put into ground and can be used as providing soft chair for oneself or being in the study seat of kindergarten.The utility model series of products one can use dual-purpose folding chair nearly ten years to graduating from primary school from the infant for child, and the portability of being grown up then goes out to use at any time, and gross weight is no more than 2 kilograms.

Below in conjunction with accompanying drawing the utility model embodiment is described.Each number designation representative in the accompanying drawing:

1-seat frame; The 2-seat board; The 3-seat cushion; The 4-backrest; The upright frame of 5-backrest; 6-seat edge side; 7-∩ shape cambered surface plug-in card; 8-U shape chair pin pin card; 9-chair pin; 10-chair pin is reinforced crosspiece; The rotating shaft of 11-chair pin; 12-handrail panel; 13-handrail panel cramp bar; 14-handrail pin; 15-handrail socket; 16-seat frame supporting brace panel; The rotating shaft of 17-handrail; 18-handrail fix shaft; The horizontal handrail angle bar of 19-; Fagging before 20-is upright; 21-handrail regulating plate; The rotating shaft of 22-backrest.

Fig. 1,2,3: the utility model dual-purpose folding chair basic structure is faced, the right side is looked, birds-eye view;

Fig. 4: shape cambered surface plug-in card shaft side figure;

Fig. 5: the chair pin folds rotation shaft side figure;

Fig. 6: seat support decomposing schematic representation;

Fig. 7: the dual-purpose folding armchair shaft side figure of handrail reassembling type;

Fig. 8: handrail grafting breakdown constructional drawing;

Fig. 9: fixed armrest scheme drawing;

Figure 10: the dual-purpose folding chair right elevation of handrail adjustable backrest;

Figure 11: the dual-purpose folding chair birds-eye view of handrail adjustable backrest.

Figure 12: the enclosure formula is the dual-purpose folding pin of backrest seat for children shaft side figure fixedly.

There is shown on the utility model bicycle and the essential characteristic structure of ground dual-purpose folding chair and the embodiment of series of products thereof.Fig. 1,2,3 is the three-dimensional view of the utility model basic structure.Fig. 1 illustrates the two pairs of chair pin (9) that are symmetrically distributed in A-A both sides, seat axis.Its flat upper end is inserted in two blocks of U-shaped clamp plates of U-shaped chair pin pin card (8).Behind chair pin rotating shaft (11) hinge, rotating shaft (11) promptly becomes the centre of gration of chair pin (9), because of being subjected to the U-shaped arc back of the body restriction of pin card (8), can only be harmonious until chair pin and seat support bottom surface to the inward turning folding; When with the slotted hole in the flat part of chair pin upper end along being inserted into the top in the rotating shaft (11), chair pin (9) upper end flat part by rotating shaft (11) and U-shaped back to clamping, the chair pin is opened outward, be put on the ground, every chair pin and ground-surface in angle be 90-84 °, or 0-6 ° of chair pin and axis A-A angle, after human body is taken, tubulose chair pin bears and is a bit larger tham actual vertical load, again because of chair pin length less than 25 centimetres, it is very little to calculate the suffered bending moment of chair sole end.Therefore, when using φ 8-φ 10 thin-wall steel tubes to do the chair pin, the chair pin has enough vertical stability rigidity.Tightened by U-shaped pin card (8) because of chair pin top again, the chair pin can not shake yet, seat frame (1) is guaranteed to have the plane stability of 75 kilograms of loads by material and structure in addition, so whole little seat sat man-hour on ground enough stability is arranged, can be because of not being subjected to rocking of seat people, mass centre changing position and produce seat and rock from side to side.As chair pin upper end slotted hole is pulled out from the U-shaped clamp plate, make arc closed contact on chair pin rotating shaft (11) and the slotted hole.∩ shape cambered surface plug-in card (7) below the seat is inserted on the preceding whippletree of bicycle, chair pin invagination is to meeting with the bicycle rack slash, then two isometric front chair legs are clamped this slash and are formed 55-65 ° chair pin angle, composition is top margin with the seat support, two chair pin are the equilateral del of isometric hypotenuse, ∩ shape cambered surface plug-in card (7) is in the base angle one of this del and divides equally on the vertical guide, also be seat support and to divide vertical guide equally vertical for chair pin angle, two pairs of chair pin and bicycle rack slash fixed with gentle rope or pintle hook lock.Seat promptly is horizontally fixed on the bicycle rack whippletree.As seat is put into bicycle rear rack, only need open the chair pin 2 under the seat support above ∩ shape cambered surface plug-in cards (7) are inserted in the clothes hanger space, back, again two pairs of chair pin invaginations are buckled on clothes hanger two side brace of back, seat promptly can not move by left-right and front-back.Fig. 2 is the position right view of the rotating shaft (22) of the location spacing of ∩ shape cambered surface plug-in card (7) and backrest (4).Fig. 3 is the B-B birds-eye view.Fig. 4, Fig. 5 show feature respectively, and in addition part ∩ shape cambered surface plug-in card (7) and chair pin fold the shaft side figure of rotational structure.This two (group) other part has guaranteed the enforcement of basic technical features of the present utility model.They also provide the basis that the dual-purpose folding chair series of products are implemented, on the bicycle and ground.Chair pin shown in Figure 5 (9) upper end flat part inserts U-shaped pin card (8), and with their movable riveted joints, imaginary line illustrates chair pin (9) location status when folding with chair pin turning cylinder (11).Fig. 6 shows seat support by seat frame (1), seat board (2), the preceding released state of seat cushion (3) stack combinations, can (1) (2) after the combination topped again (3), also can (2), (3) combination back embeds (1) fixing or (2), (3) combination back activity and is embedded in (1), turn-over uses at any time.Fig. 7 illustrates the shaft side figure of the dual-purpose folding armchair of another kind of product handrail reassembling type, and handrail rotating shaft (17) is the turnover center of handrail, pulls on the handrail upper semisection, and handrail is (17) invagination around the shaft, also can roll over outward; Press the handrail upper semisection, handrail panel cramp bar (13) lower end

Mouth injects handrail fix shaft (18), and the handrail vertical orientation is used.Fig. 8 illustrates the exploded drawings that handrail inserts or transfers to seat support.(14) be the handrail pin, (15) are the handrail socket, and jack is provided with branch head screw fixed armrest pin (14).Fig. 9 is the handrail fixed form scheme drawing of the dual-purpose folding chair of fixed armrest, and is without handrail socket (15), directly that the handrail pin (14) of above-mentioned Foldable handrail is affixed with seat frame (1).Figure 10 looks birds-eye view for the right side of another kind of product handrail adjustable backrest dual-purpose folding chair.Its horizontal handrail angle bar (19) strikes out angle bar by sheet steel, also can install plank or soft handrail thereon additional, by the exposed junction adjusting handrail of going up transfer hole insertion backrest rotating shafts (22) different in the handrail regulating plate at angle before being articulated in and the degree of dip of backrest.For backrest can be swung back near the seat support horizontal surface, upper curved section top, general-duty frame (6) rear end does not add little right angle block in aforementioned each routine dual-purpose folding chair, in order to avoid the maximum elevation of restriction backrest is no more than 100 °.Figure 12 illustrates the fixedly shaft side figure of the dual-purpose folding pin of backrest seat for children of enclosure formula, enclosure formula integral back with the thickness steel wire welded be connected to semi-moon shaped seat frame (1) about on the segmental arc of back three-dimensional.Structure below its seat support is identical with aforementioned structure, and this section description of drawings part does not add the explanation of the content of detailed description referring to this specification sheets the 5th part.

The external coating of all embodiment of the present utility model all can adopt plating, baking finish, plastic-blasting or coloured plating, increases the physical beauty of product.Part all should mould molding in addition for each.

Claims (10)

1, reaches the dual-purpose folding seat in ground on a kind of bicycle.It is by a seat support, and two pairs of collapsible chair pin (9) and a collapsible backrest (4) are formed.The axis that it is characterized in that the seat support bottom surface is provided with plural ∩ shape cambered surface plug-in card (7).Two pairs of chair pin (9) are symmetrically distributed in seat axis vertical guide both sides.Separately approximate this axis vertical guide that is parallel to of rotary middle spindle when folding.

2, according to the dual-purpose folding chair of claim 1.It is characterized in that described seat support by seat frame (1), seat board (2), the movable closed assembly combination of seat cushion (3), seat board (2) embeds movable topped seat cushion (3) above the fixing back of seat frame (1) separately.Also can embed in the present frame (1) of the fixed or movable placement of seat frame (1) with seat cushion (3) combination back by seat board (2).

3, according to the dual-purpose folding chair of claim 2.It is characterized in that a frame (1) is bent by metal pipe material or section bar, there is upper curved section the rear end of its dual-side (6).Be drilled with aperture on the edge before the last bent angle, be provided with 2 at the bottom of the frame with upper support brace panel (16).

4, according to the dual-purpose folding chair of claim 1.It is characterized in that described ∩ shape cambered surface plug-in card (7) made by rigid material, each tangentially extends one section straight flange and forms integral body cambered surface by arc two ends, half garden, and the vertical degree of depth of the diameter of half garden arc and cambered surface all adapts with bicycle rack whippletree diameter.Location spacing on present frame (1) axis, bottom surface of 2 above ∩ shape cambered surface plug-in cards (7) and the neutral gear of bicycle rear rack be apart from adapting, and is fixed in the supporting brace panel (16) at the bottom of the frame or the bottom surface of seat board (2) with welding, bonding or screw thread.

5, according to the dual-purpose folding chair of claim 1, it is characterized in that chair pin (9) is paired by the solid welding of chair pin reinforcing crosspiece (10), the upper end is hinged with U-shaped chair pin pin card (8),, affixed with the supporting brace panel (16) of seat frame bottom surface with the U-shaped opening with arbitrary mode of welding, riveted joint, bonding or screw thread towards seat axis direction.Chair pin (9) bottom cover is with rubber and plastic sheath or attaching universal rolling wheel.

6,, it is characterized in that U-shaped chair pin pin card (8) by metallic material compacting or smart casting, or make by thermoplastic plastic injecting according to the dual-purpose folding chair of claim 1 or 5.It is integral by the straight clamping plate in the both sides of U font and with the top plate pack of 84 °-90 ° of its angles.Have through hole on two straight clamping plate, the top is dull and stereotyped affixed with welding, riveted joint or screw thread and seat frame supporting brace panel (16).

7, according to the dual-purpose folding chair of claim 1, it is characterized in that installing additional a pair of by handrail panel (12), fastening handrail panel cramp bar (13) with panel, form folding handrail with its movable handrail pin (14) that is hinged.Reassembling type ground socket joint is being fixed within the handrail socket (15) of frame supporting brace panel (16) bottom surface.

8,, it is characterized in that movable socket joint with the reassembling type stow-away arm rest changes handrail pin (14) into and directly is fixedly connected on a bottom surface of frame supporting brace panel (16) according to the dual-purpose folding chair of claim 1 or 7.The handrail upper semisection is still collapsible.

9,, it is characterized in that being provided with a pair of and the backrest hinge according to the dual-purpose folding chair of claim 1.The movable hand rail of height tilt adjustable joint, comprise horizontal handrail angle bar (19), the upper end is hinged with this handrail angle bar front end, and the bottom is hinged in the hypomere of the upright frame of fagging (20) backrest (5) before frame side (a 6) front end upright and four connecting rods that (6) four sections rod member moveable hinges of seat frame side are connected into parallelogram.Angle hinge handrail regulating plate on before it has 3 with the adjusted knock hole on its plate body.

10,, it is characterized in that being provided with the fixedly alternative aforesaid folding back (4) of backrest of an enclosure shape according to the dual-purpose folding chair of claim 1.Enclosure shape backrest is curved by metal filament.Be welded in the periphery of the left back right three-dimensional of a frame (1), seat frame (1) is that forward direction is the tortuous bow shape of straight line.

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