CN201806266U - Chair with backrest capable of moving forward and backward - Google Patents

Abstract

The utility model relates to a chair with a backrest capable of moving forward and backward, comprising a chair base and a backrest; the lower end of the backrest is detached from the chair base; two sides of the lower end of the backrest and two sides of the back end of the backrest are connected respectively by means of a suit of rotating mechanism; the lower end of the rotating mechanism can rotate and adjust relative to the backrest; the upper end of the rotating mechanism can rotate and adjust relative to the backrest; and the backrest just moves forward and backward relative to the chair base and the vertical state of the backrest always remains unchanged in the rotation and adjustment process of the rotating mechanism. A sitter can move and adjust the backrest of the chair forward and backward according to self requirement so that the backrest always keeps attached to the back to obtain good comfortable feeling.

Description

The chair that backrest can move forward and backward

Technical field the utility model relates to chair, particularly relates to the chair that backrest can move forward and backward.

Background technology is along with the progress of society, the raising of people's living standard, and people have had more and higher requirement to the environment and the articles for use of work, life.With regard to by chair for example office chair or other seat, occurred diversified design day by day to satisfy the various needs of people: having can lift adjustment, has waist to lean on adjusting, having headrest to regulate, and backrest reclining angular adjustment is arranged, or the like.But the various chairs of prior art, its backrest all are directly to be connected with seat support or integrated, perhaps be connected with seat support by supporting rod, even such chair backrest seat support is relatively regulated, also be that relative seat support carries out the angular adjustment variation, sit straight and swing back to be fit to people.At present, the backrest chair that moves forward and backward of seat support does not relatively appear as yet.

Utility model content the technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and proposes the chair that a kind of backrest can move forward and backward, the seat person can move forward and backward adjusting to back according to the needs of oneself, so that backrest always keeps fitting with own back and obtains good comfort.

The utility model solve the technical problem can be by realizing by the following technical solutions:

The chair that design, a kind of backrest of manufacturing can move forward and backward, comprise seat support and backrest, described backrest lower end and seat support are separated, be connected by a cover rotating mechanism respectively between backrest lower end two avris and chair base rear end two avris, adjusting can be rotated relative to seat support in the lower end of described rotating mechanism, adjusting can be rotated relative to backrest in the upper end of described rotating mechanism, and, in the rotation adjustment process of described rotating mechanism, described backrest is that relative seat support moves forward and backward and the vertical state of backrest remains constant.

As concrete further improvement of the present utility model, described rotating mechanism comprises that first rotates rod member, second rotation rod member, the first cradle head part and the second cradle head part; The described first rotation rod member is a hollow type, is dumbbell shaped substantially, and two ends are cylinder type greatly up and down, and interlude is strip for a short time; Described second rotates the rod member two ends has circular hole; The described first cradle head part is cylindric substantially, and interlude is big and inside and outside two sections little; First mount pad of described first cradle head part and described backrest lower end avris is connected and fixed, and the inner of the first cradle head part embeds in described first mount pad; The described second cradle head part also is cylindric substantially, and interlude is big and inside and outside two sections little, and this second cradle head part is fixedlyed connected by screw with second mount pad of described chair base rear end avris, and the inner of the second cradle head part embeds in described second mount pad; Radially have first groove in the described first cradle head part, and have first axis hole vertically; Described second upper end of rotating rod member is in described first groove, and inserts described first axis hole and second by first axostylus axostyle and rotate the circular hole realization second rotation rod member of rod member upper end and being rotatably connected of the first cradle head part; Radially have second groove in the described second cradle head part, and have second axis hole vertically, described second lower end of rotating rod member is in described second groove, and inserts described second axis hole and second by second axostylus axostyle and rotate the circular hole realization second rotation rod member of rod member lower end and being rotatably connected of the second cradle head part; The outer end that the described first cradle head part is entangled in described first upper end of rotating rod member, the outer end that the described second cradle head part is entangled in described first lower end of rotating rod member; Described first upper end of rotating rod member has first center hole, and first lower end of rotating rod member has second center hole; Have first centre bore on the described first cradle head part, have second centre bore on the described second cradle head part; Described rotating mechanism also comprises first screw rod and second screw rod, and this a two screw rods all rear has external screw thread, and all the other bar sections are the polished rod section; Described first screw rod passes behind described first center hole and described first centre bore precession more successively and is opened in the screw in described first mount pad, described second screw rod passes behind described second center hole and described second centre bore precession more successively and is opened in the screw in described second mount pad, and guarantee that described first upper end of rotating rod member can be rotated relative to first screw rod, first lower end of rotating rod member can be rotated relative to second screw rod; The line of first centre bore and first axis hole parallels with the line of second centre bore and second axis hole, and the line of first centre bore and second centre bore parallels with the line of first axis hole and second axis hole.

Between described first screw rod and first center hole, between described second screw rod and second center hole, be respectively equipped with first sleeve and second sleeve; The end of this first sleeve and second sleeve all is provided with sawtooth, and their serrated portion is not embedded in described first centre bore and second centre bore; After described first sleeve and second sleeve are housed, described first upper end of rotating rod member relative to first sleeve rotates, the first lower end energy that rotates rod member rotate relative to second sleeve.

Between described first sleeve and first center hole, between described second sleeve and second center hole, be equipped with the sound insulation packing ring; Described first rotates between the outer end of the upper end of rod member and the described first cradle head part and is provided with first sound insulating member, has on this first sound insulating member to be used for the through hole that described first screw rod and first axostylus axostyle pass through; Described first rotates between the outer end of the lower end of rod member and the described second cradle head part and is provided with second sound insulating member, has on this second sound insulating member to be used for the through hole that described second screw rod and second axostylus axostyle pass through; Described second rotate between the upper end and the first cradle head part of rod member, between the lower end and the second cradle head part of the second rotation rod member, be equipped with sound insulation sheet circle.

Described rotating mechanism also comprises enclosing cover, and circular end cap also is stamped in described first top and bottom of rotating rod member.

The described first rotation rod member and second rotates between the rod member and also is provided with first spring.

Outwards be extruded with spacing block set on the outer end circular arc wall of the described first cradle head part, the described first upper end inwall that rotates rod member is provided with and the suitable deep-slotted chip breaker of described spacing block set.

The described first lower end inwall that rotates rod member is provided with arc boss, and the arc room of joining with described arc boss acquaintance is left in the outer end of the described second cradle head part.

In the utility model, described rotating mechanism can also carry out many gears and regulate control, make backrest on the direction that seat support moves forward and backward relatively, several gears be arranged, different needs with the people that are fit to different builds, specific design comprises that following dual mode (certainly, also can adopt the design of alternate manner to regulate control with many gears of realizing rotating mechanism, exclusive list not in the utility model): one, described rotating mechanism comprises spacing adjustment means, and described spacing adjustment means comprises spacing adjusting buckle, rotating shaft and compression spring are installed; Have installing hole on the described first cradle head part, described installation rotating shaft one end is installed in rotation in the described installing hole, and the other end of described installation rotating shaft inserts in the circular hole of described spacing adjusting buckle one end; The other end of described spacing adjusting buckle is provided with arc convex portion, and the described first upper end inwall that rotates rod member is provided with the suitable wave channel with described arc convex portion; One end of described compression spring has this end of arc convex portion to be connected with described spacing adjusting buckle, and the other end of compression spring is connected with the described first cradle head part by fixed axis; The installation end of described spacing adjusting buckle is provided with small lugs, and the described first upper end inwall that rotates rod member is provided with the deep-slotted chip breaker that is used for described small lugs activity, and the terminal of this deep-slotted chip breaker is the origin or beginning of described wave channel; The whole overwhelming majority of described spacing adjustment means is in the cavity of first cradle head.Two, described rotating mechanism comprises spacing adjustment means, and this spacing adjustment means comprises arc lockplate, second spring and by-pass cock; The inner of described arc lockplate is passed described first mount pad and is stretched to inside, backrest lower end, and can be movable in inside, backrest lower end, and described second spring withstands the inner of described arc lockplate; The outer end of described arc lockplate is provided with at least one locking teeth, has the arc slot that described arc lockplate passes through on the described first cradle head part, and the described first upper end inwall that rotates rod member is provided with and the suitable wave tooth of described locking teeth; Described by-pass cock comprises button portion and the adjusting rod that is in the angle of cut, and turning by bearing pin of described adjusting rod is installed in inside, backrest lower end, and the end of adjusting rod is connected with the inner of described arc lockplate by strengthening iron core.

In above-mentioned second kind of design, described locking teeth preferred design becomes three and evenly distribution.

The described first cradle head part is done by the 3rd screw rod and described first mount pad and is removably connected, and described first upper end of rotating rod member has and is used for the through hole that described the 3rd screw rod passes through; The inner of the described first cradle head part is designed to butterfly structure, is designed to the inner shape adapting with the described first cradle head part in described first mount pad.

Another purpose of the present utility model provides a kind of rotating mechanism that is used for chair so that back relatively seat support move forward and backward a kind of rotating mechanism that is used for chair, goal of the invention of the present utility model can be by realizing by the following technical solutions:

Design, a kind of rotating mechanism that is used for chair of making, be connected between back lower end avris and the chair base rear end avris, adjusting can be rotated relative to seat support in the lower end of described rotating mechanism, adjusting can be rotated relative to backrest in the upper end of described rotating mechanism, and, in the rotation adjustment process of described rotating mechanism, described backrest is that relative seat support moves forward and backward and the vertical state of backrest remains constant.

Compare with prior art, the technique effect of the chair that the utility model backrest can move forward and backward is: 1. the seat person can move forward and backward adjusting to back as required, remain with own back and to fit and obtain good comfort, and, can be fit to the seat person of different builds; 2. spacing adjustment means is set, makes moving forward and backward of backrest realize many gearizations, the needs of the different sitting postures of person that therefore can better adapt to the seat; 3. the first cradle head part is done by the 3rd screw rod and described first mount pad and is removably connected, and therefore, if the 3rd screw rod is not installed, backrest can be drawn close convenient like this transportation to seat support is folding.

Description of drawings

Fig. 1 is the structural representation of the utility model backrest chair that can move forward and backward, and comprises Fig. 1-1 to 1-3, illustrates the process that the relative seat support of backrest moves forward and backward;

Fig. 2 is the perspective exploded view of the described backrest chair embodiment one that can move forward and backward;

Fig. 3 is the assembling process schematic diagram of the described backrest chair embodiment one that can move forward and backward;

Fig. 4 is the schematic rear view of the described backrest chair embodiment one that can move forward and backward;

Fig. 5 is that A-A among Fig. 4 is to cross-sectional schematic;

Fig. 6 is that B-B among Fig. 4 is to cross-sectional schematic;

Fig. 7 is that C-C among Fig. 5 is to cross-sectional schematic;

Fig. 8 is the rotating mechanism rotation process principle schematic of the described backrest chair that can move forward and backward;

Fig. 9 is the perspective view of the first cradle head part of the described backrest chair embodiment one that can move forward and backward, comprises the stereogram 9-1 and the 9-2 of two different directions;

Figure 10 is the perspective view of the second cradle head part of the described backrest chair embodiment one that can move forward and backward, comprises the stereogram 10-1 and the 10-2 of two different directions

Figure 11 is the perspective view that first of the described backrest chair embodiment one that can move forward and backward rotates rod member;

Figure 12 is the perspective view of the spacing adjusting buckle of the described backrest chair embodiment one that can move forward and backward, comprises the stereogram 10-1 to 10-3 of three different directions;

Figure 13 to Figure 18 illustrates the rotation adjustment process of the chair embodiment one that described backrest can move forward and backward;

Figure 19 and Figure 20 illustrate the gathering process of the backrest of the chair embodiment one that described backrest can move forward and backward to seat support;

Figure 21 is the perspective exploded view of the described backrest chair embodiment two that can move forward and backward;

Figure 22 illustrates the spacing adjustment means of the chair embodiment two that described backrest can move forward and backward and the position annexation between the chair back;

Figure 23 is the structural representation of the described backrest chair embodiment two that can move forward and backward;

Figure 24 is that D-D among Figure 23 is to cross-sectional schematic;

Figure 25 is the perspective view that first of the described backrest chair embodiment two that can move forward and backward rotates rod member;

Figure 26 is the perspective view of the first cradle head part of the described backrest chair embodiment two that can move forward and backward;

Figure 27 is the perspective view of the arc lockplate of the described backrest chair embodiment two that can move forward and backward;

Figure 28 is the perspective view of the by-pass cock of the described backrest chair embodiment two that can move forward and backward;

Figure 29 to Figure 31 illustrates the rotation adjustment process of the chair embodiment one that described backrest can move forward and backward.

The specific embodiment is described in further detail below in conjunction with the preferred embodiment shown in the accompanying drawing.

The chair that a kind of backrest can move forward and backward, as shown in Figure 1, comprise seat support 800 and backrest 600, described backrest 600 lower ends and seat support 800 are separated, be connected by a cover rotating mechanism 100 (or 200) respectively between backrest 600 lower ends two avris and seat support 800 rear ends two avris, adjusting can be rotated relative to seat support 800 in the lower end of described rotating mechanism 100 (or 200), adjusting can be rotated relative to backrest 600 in the upper end of described rotating mechanism 100 (or 200), and, in the rotation adjustment process of described rotating mechanism 100 (or 200), described backrest 600 is that relative seat support 800 moves forward and backward and the vertical state of backrest 600 remains constant.

Embodiment one:

The chair embodiment one that the utility model backrest can move forward and backward, extremely shown in Figure 7 in conjunction with Fig. 2, the rotating mechanism 100 that is connected between seat support 800 and the backrest 600 comprises that first rotates rod member 10, the second rotation rod member 20, the first cradle head part 30, the second cradle head part 40 and enclosing cover 50, and rotates the upper end 11 of rod member 10 and the circular end cap 60 that lower end 12 covers with first; Described first to rotate rod member 10 be hollow type, is dumbbell shaped substantially, and two ends are big and interlude is little up and down, and two ends 11,12 are cylinder type up and down, and interlude is strip (combination is referring to Figure 11); Described second rotates rod member 20 two ends has circular hole 21,22; The described first cradle head part 30 is cylindric substantially, interlude big and inside and outside two sections little (in conjunction with referring to shown in Figure 9); The described first cradle head part 30 is connected and fixed with first mount pad 601 of described backrest 600 lower end avris, and the inner 31 of the first cradle head part 30 embeds in described first mount pad 601; The described second cradle head part 40 also is cylindric substantially, interlude big and inside and outside two sections little (in conjunction with referring to shown in Figure 10), this second cradle head part 40 is fixedlyed connected by screw 802 with second mount pad 801 of described seat support 800 rear end avris, and the inner of the second cradle head part 40 embeds in described second mount pad 801; Radially have first groove 32 in the described first cradle head part 30, and have first axis hole 33 vertically; Described second upper end of rotating rod member 20 is in described first groove 32, and inserts described first axis hole 33 and second by first axostylus axostyle 23 and rotate circular hole 21 realizations, the second rotation rod member 20 of rod member 20 upper ends and being rotatably connected of the first cradle head part 10; Radially have second groove 42 in the described second cradle head part 40, and have second axis hole 43 vertically, described second lower end of rotating rod member 20 is in described second groove 42, and inserts described second axis hole 43 and second by second axostylus axostyle 24 and rotate circular hole 22 realizations, the second rotation rod member 20 of rod member 20 lower ends and being rotatably connected of the second cradle head part 40; The outer end 39 that the described first cradle head part 30 is entangled in described first upper end 11 of rotating rod member 10, the outer end 49 that the described second cradle head part 40 is entangled in described first lower end 12 of rotating rod member 10; The lower end that described first upper end of rotating rod member 10 has first center hole, 18, the first rotation rod members 10 has second center hole 19; Have first centre bore 38 on the described first cradle head part 30, have second centre bore 48 on the described second cradle head part 40; Described rotating mechanism 100 also comprises first screw rod 70 and second screw rod 71, and this two screw rods 70,71 an all rear has external screw thread, and all the other bar sections are the polished rod section; Described first screw rod 70 passes behind described first center hole 18 and described first centre bore 38 precession more successively and is opened in the screw in described first mount pad 601, described second screw rod 71 passes behind described second center hole 19 and described second centre bore 48 precession more successively and is opened in the screw in described second mount pad 801, and guarantee that described first upper end 11 of rotating rod member 10 can be rotated relative to first screw rod 70 (polished rod section), first lower end 12 of rotating rod member 10 can be rotated relative to second screw rod 71 (polished rod section); In same plane, the line of first centre bore 38 and first axis hole 33 parallels with the line of second centre bore 48 and second axis hole 43, and the line of first centre bore 38 and second centre bore 48 parallels with the line of first axis hole 33 and second axis hole 43.

The chair that the utility model backrest can move forward and backward is implemented in rotating mechanism 100 rotating process, and backrest 600 is that relative seat support 800 moves forward and backward and the vertical state of backrest 600 remains constant.It realizes principle as shown in Figure 8, and according to the principle of parallelogram, if two parallel edges of parallelogram are around when four jiaos of intersection points rotate, the two other parallel edges will remain parastate.Correspond to shown in Fig. 8, described first rotates rod member 10 and second rotates rod member 20 and is equivalent to two parallel edges ab and cd among the figure, first centre bore 38 on the first cradle head part 30 (perhaps first center hole 18 of the upper end of the first rotation rod member 10) and first axis hole 33 (perhaps second center hole 19 of the lower end of the first rotation rod member 10) are equivalent to a point and d point among the figure, second centre bore 48 on the second cradle head part 40 (perhaps second center hole 19 of the lower end of the first rotation rod member 10) and second axis hole 43 are equivalent to b point and the c point among the figure, ad limit and bc limit are initially located in level, in the rotation process on ab and two limits of cd, described ad limit moves forward and backward relative bc limit and remains level.And correspond in the chair, first mount pad 601 and the first cradle head part 30 of back 600 lower ends are connected and fixed, also be that backrest 600 is vertically to be fixed on (another avris of backrest also has a cover rotating mechanism) on the described ad limit, avris second mount pad 801 and the second cradle head part 40 of seat support 800 are connected and fixed, also be that visual seat support 800 is equivalent to the bc limit, therefore, in rotating mechanism 100 rotating process, backrest 600 seat support 800 relatively moves forward and backward and the vertical state of backrest 600 remains constant.The utility model has utilized parallelogram principle cleverly, four jiaos of a, b of parallelogram, c, d point are four pivots, realized that first rotates rod member 10 and second and rotate both upper ends of rod member 20 and can relatively rotate with backrest 600, the lower end can relatively rotate with seat support 800, parallel, rotational motion by the first rotation rod member 10 and the second rotation rod member 20 changes into the front and back translational motion of backrest 600.

For the structure that makes entire mechanism is more compact, as Fig. 2 and shown in Figure 7, between described first screw rod 70 and first center hole 18, between described second screw rod 71 and second center hole 19, be respectively equipped with first sleeve 73 and second sleeve 74; The end of this first sleeve 73 and second sleeve 74 all is provided with sawtooth, and their serrated portion is not embedded in described first centre bore 38 and second centre bore 48; After described first sleeve 73 and second sleeve 74 were housed, first screw rod 70 and second screw rod 71 compressed first sleeve 73 and second sleeve 74 respectively; Described first upper end 11 of rotating rod member 10 can be rotated relative to first sleeve 73, first lower end 12 of rotating rod member 10 can be rotated relative to second sleeve 74.When rotating mechanism rotates, because having sawtooth portion and embed respectively, fix in the two cradle head parts by two sleeves 73,74, so will can not produce rotation because of the friction of rotation, so just avoided mechanism's long-term motion, screw rod can withdraw from because of the friction rotation. make the more firm safety of total.

Because respectively rotating rod member, cradle head part, screw rod etc. all is metal materials, directly noise is big in the big and course of action of contact wear, therefore, is equipped with the sound insulating member of plastic cement or other non-metallic material or packing ring etc. each other at them.Specifically: as shown in Figure 2, between described first sleeve 73 and first center hole 18, between described second sleeve 74 and second center hole 19, be equipped with sound insulation packing ring 75; Described first rotates between the outer end 39 of the upper end 11 of rod member 10 and the described first cradle head part 30 and is provided with first sound insulating member 77, has on this first sound insulating member 77 to be used for the through hole that described first screw rod 70 and first axostylus axostyle 23 pass through; Described first rotates between the outer end 49 of the lower end 12 of rod member 10 and the described second cradle head part 40 and is provided with second sound insulating member 76, has on this second sound insulating member 76 to be used for the through hole that described second screw rod 71 and second axostylus axostyle 24 pass through; Described second rotate between the upper end and the first cradle head part 30 of rod member 20, between the lower end and the second cradle head part 40 of the second rotation rod member 20, be equipped with sound insulation sheet circle 78.

In order to strengthen mechanism's pretightning force when movable, can be not slack and undisciplined when making each accessory motion, especially guarantee that first rotates the rod member 10 and second parallel relation of rotating between the rod member 20, as shown in Figure 6, the described first rotation rod member 10 and second rotates between the rod member 20 and also is provided with first spring 80.

In conjunction with Fig. 6, Fig. 9 and shown in Figure 11, outwards be extruded with spacing block set 35 on outer end 39 circular arc wall of the described first cradle head part 30, accordingly, described first upper end 11 inwalls that rotate rod member 10 are provided with the deep-slotted chip breaker 15 suitable with described spacing block set 35, because the length of deep-slotted chip breaker 15 is determined, is subjected to the barrier effect of spacing block set 35, therefore, first rotates rotatablely moving of rod member 10 is limited to carry out within the specific limits, guarantees reliability of products and accuracy.

In like manner, with aforementioned corresponding, described first lower end 12 inwalls that rotate rod member 10 are provided with arc boss 16, and the arc room 46 of joining with described arc boss 16 acquaintances is left in the outer end of the described second cradle head part 40.Make first the rotatablely moving of rod member 10 of rotation be limited to carry out within the specific limits like this, guarantee reliability of products and accuracy, especially when turning to extreme position, arc boss 16 plays and well stops and supporting role, stops the first rotation rod member 10 to be rotated further down and the rotation that can only commutate.

The needs of the different sitting postures of person that can better adapt to the seat in order to make moving forward and backward of backrest 600 realize many gearizations, in the chair that the utility model backrest can move forward and backward, in conjunction with Fig. 2, Fig. 3, Fig. 9, Figure 11 to shown in Figure 180, described rotating mechanism 100 also comprises spacing adjustment means, and described spacing adjustment means comprises spacing adjusting buckle 90, rotating shaft 91 and compression spring 92 are installed; Have installing hole 37 on the described first cradle head part 30, described installation rotating shaft 91 1 ends are installed in rotation in the described installing hole 37, and the other end of described installation rotating shaft 91 inserts in the circular hole 901 of described spacing adjusting buckle 90 1 ends; The other end of described spacing adjusting buckle 90 is provided with arc convex portion 902, and described first upper end 11 inwalls that rotate rod member 10 are provided with the wave channel 102 suitable with described arc convex portion 902; One end of described compression spring 92 and described spacing adjusting buckle 90 have the small column 903 on this end of arc convex portion 902 to be connected, and the other end of compression spring 92 is connected with the described first cradle head part 30 by fixed axis 301; The installation end of described spacing adjusting buckle 90 is provided with small lugs 904, and described first upper end 11 inwalls that rotate rod member 10 are provided with the deep-slotted chip breaker 104 that is used for described small lugs 904 activities, and the terminal of this deep-slotted chip breaker 104 is the origin or beginning of described wave channel 103; The whole overwhelming majority of described spacing adjustment means is in the cavity of first cradle head 30.Below in conjunction with spacing Principles of Regulation of described rotating mechanism gear more than 100 and process under Figure 13 to Figure 18 simple declaration: being in rearmost end with backrest 600 is original state, at this moment, the effect of spring 92 is stressed, the arc convex portion 902 of described spacing adjusting buckle 90 is in described wave channel 102 trough topmost, along direction of arrow rotation rotating mechanism 100 (being backrest 600 translation forward) among the figure, the crest of wave channel 103 slowly ejects the arc convex portion 902 of spacing adjusting buckle 90 on the first rotation rod member 10, shown in Figure 13 to 15, described arc convex portion 902 slips over the crest place of wave channel 103, effect at compression spring 92 is pressed in next trough of wave channel 103, realized the adjusting of next gear and spacing, follow-up gear Principles of Regulation are the same, and what of regulation stall are according to the wave of wave channel 103 design number and decide.When needs backward during translation backrest 600, shown in Figure 16 to 18, at first continue to rotate forward and be adjusted to last step, continuing to make rotating mechanism 100 to rotate (as shown in figure 16) forward then is limiting condition (as shown in figure 16) until described small lugs 904 movable initiating terminals to deep-slotted chip breaker 104, continuing the application of force then is rotated further, at this moment, the initial end of deep-slotted chip breaker 104 acts on described small lugs 904, force described spacing adjusting buckle 90 to turn to another angle, simultaneously, spacing adjusting buckle 90 keeps this state (as shown in figure 17) under the effect of compression spring 92, like this, described arc convex portion 902 can not stop any one crest of wave channel 103 fully, at this moment, can rotate rotating mechanism 100 backward along the direction of arrow shown in Figure 18,103 initial crest places touch described small lugs 904 until described wave channel, to overcome the pressure of that direction of compression spring 92 when the state shown in Figure 17, and change the pressure direction of compression spring 92 again, make described arc convex portion 902 fall into the trough of described wave channel, so circulation once more.

As shown in Figures 2 and 3, the described first cradle head part 30 is done with described first mount pad 601 by the 3rd screw rod 34 and is removably connected, and described first upper end 11 of rotating rod member 10 has and is used for the through hole 111 that described the 3rd screw rod 34 passes through; Like this, can be when assembling, in advance not with described the 3rd screw rod 34 and 60 assemblings of circular end cap, at this moment, first mount pad 601 can rotate relative to the first cradle head part 30, also is that backrest 600 can relatively rotate mechanism's 100 rotations, therefore, backrest 600 can fold gathering to seat support shown in the image pattern 19-20 like that, the convenient transportation to dwindle taking up room of chair.As shown in FIG., the inner of the described first cradle head part 30 is designed to butterfly structure, be designed to the inner shape adapting with the described first cradle head part in described first mount pad 601, limited the slewing area of backrest 600 like this, avoided backrest 600 to rotate excessively and receive destruction.

Embodiment two:

The chair embodiment two that the utility model backrest can move forward and backward, shown in Figure 21 to 28, present embodiment two is basic identical with embodiment one structure and principle, and difference is the design of rotating mechanism 200 in the spacing control and regulation of many gears, specifically:

Described rotating mechanism 200 comprises spacing adjustment means, and this spacing adjustment means comprises arc lockplate 51, second spring 52 and by-pass cock 53; The inner of described arc lockplate 51 is passed described first mount pad 601 and is stretched to inside, backrest 600 lower end, and can be movable in inside, backrest 600 lower end, the inner that described second spring 52 withstands described arc lockplate 51; The outer end of described arc lockplate 51 is provided with three equally distributed locking teeths 511, have the arc slot 302 that described arc lockplate 51 passes through on the described first cradle head part 30, described first upper end 11 inwalls that rotate rod member 10 are provided with the wave tooth 115 suitable with described locking teeth 511; Described by-pass cock 53 comprises button portion 531 and the adjusting rod 532 that is in the angle of cut, turning by bearing pin 605 of described adjusting rod 532 is installed in inside, backrest 600 lower end (inside, backrest 600 lower end is installed or be molded directly within to described bearing pin), the end of adjusting rod 532 is connected with the inner of described arc lockplate 51 and (specifically is by strengthening iron core 533 (strengthen iron core 533 can adjusting rod one-body molded), arc lockplate 51 the inners have aperture, and described reinforcement iron core 533 inserts to be realized in the aperture connecting).The principle of the spacing control and regulation of concrete many gears and process are extremely shown in Figure 31 in conjunction with Figure 29, during a certain therein gear, described arc lockplate 51 is under the effect of second spring 52, locking teeth 511 is embedded in the wave tooth paddy of this gear correspondence, when needing to regulate, press the button portion 531 of by-pass cock 53, described adjusting rod 532 rotations, overcome the elastic force effect of second spring 52 and order about described arc lockplate 51 and retreat, outside described locking teeth 511 withdraws from described wave tooth 115, promptly rotatable described rotating mechanism 200, when adjusting puts in place, loosen described button portion 531, described arc lockplate 51 is under the effect of second spring, and the locking teeth 511 of arc lockplate 51 is embedded in the pairing wave tooth paddy of new gear again.

Present embodiment two is under the situation that described the 3rd screw rod 34 and circular end cap 60 are not assembled in advance, can realize that equally backrest 600 is to seat support 800 folding drawing close, different is, must in advance described arc lockplate 51 all be compressed inside, backrest lower end and promptly be foldable to shape shown in Figure 20, conveniently be transported to when making land used, rotate described backrest 600, aim at the arc slot 302 on the described first cradle head part 30 until described arc lockplate 51, described arc lockplate 51 can eject under the effect of second spring automatically.

Above content be in conjunction with concrete optimal technical scheme to further describing that utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims (12)

1. the chair that backrest can move forward and backward comprises seat support and backrest, it is characterized in that:

Described backrest lower end and seat support are separated, be connected by a cover rotating mechanism respectively between backrest lower end two avris and chair base rear end two avris, adjusting can be rotated relative to seat support in the lower end of described rotating mechanism, adjusting can be rotated relative to backrest in the upper end of described rotating mechanism, and, in the rotation adjustment process of described rotating mechanism, described backrest is that relative seat support moves forward and backward and the vertical state of backrest remains constant;

Described rotating mechanism comprises that first rotates rod member, second rotation rod member, the first cradle head part and the second cradle head part;

The described first rotation rod member is a hollow type, is dumbbell shaped substantially, and two ends are cylinder type greatly up and down, and interlude is strip for a short time;

Described second rotates the rod member two ends has circular hole;

The described first cradle head part is cylindric substantially, and interlude is big and inside and outside two sections little; First mount pad of described first cradle head part and described backrest lower end avris is connected and fixed, and the inner of the first cradle head part embeds in described first mount pad;

The described second cradle head part also is cylindric substantially, and interlude is big and inside and outside two sections little, and this second cradle head part is fixedlyed connected by screw with second mount pad of described chair base rear end avris, and the inner of the second cradle head part embeds in described second mount pad;

Radially have first groove in the described first cradle head part, and have first axis hole vertically; Described second upper end of rotating rod member is in described first groove, and inserts described first axis hole and second by first axostylus axostyle and rotate the circular hole realization second rotation rod member of rod member upper end and being rotatably connected of the first cradle head part;

Radially have second groove in the described second cradle head part, and have second axis hole vertically, described second lower end of rotating rod member is in described second groove, and inserts described second axis hole and second by second axostylus axostyle and rotate the circular hole realization second rotation rod member of rod member lower end and being rotatably connected of the second cradle head part;

The outer end that the described first cradle head part is entangled in described first upper end of rotating rod member, the outer end that the described second cradle head part is entangled in described first lower end of rotating rod member; Described first upper end of rotating rod member has first center hole, and first lower end of rotating rod member has second center hole; Have first centre bore on the described first cradle head part, have second centre bore on the described second cradle head part;

Described rotating mechanism also comprises first screw rod and second screw rod, and this a two screw rods all rear has external screw thread, and all the other bar sections are the polished rod section; Described first screw rod passes behind described first center hole and described first centre bore precession more successively and is opened in the screw in described first mount pad, described second screw rod passes behind described second center hole and described second centre bore precession more successively and is opened in the screw in described second mount pad, and guarantee that described first upper end of rotating rod member can be rotated relative to first screw rod, first lower end of rotating rod member can be rotated relative to second screw rod;

The line of first centre bore and first axis hole parallels with the line of second centre bore and second axis hole, and the line of first centre bore and second centre bore parallels with the line of first axis hole and second axis hole.

2. the chair that backrest as claimed in claim 1 can move forward and backward is characterized in that: between described first screw rod and first center hole, between described second screw rod and second center hole, be respectively equipped with first sleeve and second sleeve; The end of this first sleeve and second sleeve all is provided with sawtooth, and their serrated portion is not embedded in described first centre bore and second centre bore; After described first sleeve and second sleeve were housed, described first upper end of rotating rod member can be rotated relative to first sleeve, first lower end of rotating rod member can be rotated relative to second sleeve.

3. the chair that backrest as claimed in claim 2 can move forward and backward is characterized in that: between described first sleeve and first center hole, between described second sleeve and second center hole, be equipped with the sound insulation packing ring; Described first rotates between the outer end of the upper end of rod member and the described first cradle head part and is provided with first sound insulating member, has on this first sound insulating member to be used for the through hole that described first screw rod and first axostylus axostyle pass through; Described first rotates between the outer end of the lower end of rod member and the described second cradle head part and is provided with second sound insulating member, has on this second sound insulating member to be used for the through hole that described second screw rod and second axostylus axostyle pass through; Described second rotate between the upper end and the first cradle head part of rod member, between the lower end and the second cradle head part of the second rotation rod member, be equipped with sound insulation sheet circle.

4. the chair that backrest as claimed in claim 1 can move forward and backward is characterized in that: described rotating mechanism also comprises enclosing cover, and circular end cap also is stamped in described first top and bottom of rotating rod member.

5. the chair that backrest as claimed in claim 1 can move forward and backward is characterized in that: the described first rotation rod member and second rotates between the rod member and also is provided with first spring.

6. the chair that backrest as claimed in claim 1 can move forward and backward, it is characterized in that: outwards be extruded with spacing block set on the outer end circular arc wall of the described first cradle head part, the described first upper end inwall that rotates rod member is provided with and the suitable deep-slotted chip breaker of described spacing block set.

7. the chair that backrest as claimed in claim 1 can move forward and backward is characterized in that: the described first lower end inwall that rotates rod member is provided with arc boss, and the arc room of joining with described arc boss acquaintance is left in the outer end of the described second cradle head part.

8. the chair that can move forward and backward as each described backrest of claim 1 to 7, it is characterized in that: described rotating mechanism also comprises spacing adjustment means, described spacing adjustment means comprises spacing adjusting buckle, rotating shaft and compression spring is installed; Have installing hole on the described first cradle head part, described installation rotating shaft one end is installed in rotation in the described installing hole, and the other end of described installation rotating shaft inserts in the circular hole of described spacing adjusting buckle one end; The other end of described spacing adjusting buckle is provided with arc convex portion, and the described first upper end inwall that rotates rod member is provided with the suitable wave channel with described arc convex portion; One end of described compression spring has this end of arc convex portion to be connected with described spacing adjusting buckle, and the other end of compression spring is connected with the described first cradle head part by fixed axis; The installation end of described spacing adjusting buckle is provided with small lugs, and the described first upper end inwall that rotates rod member is provided with the deep-slotted chip breaker that is used for described small lugs activity, and the terminal of this deep-slotted chip breaker is the origin or beginning of described wave channel; The whole overwhelming majority of described spacing adjustment means is in the cavity of first cradle head.

9. the chair that can move forward and backward as each described backrest of claim 1 to 7, it is characterized in that: described rotating mechanism also comprises spacing adjustment means, this spacing adjustment means comprises arc lockplate, second spring and by-pass cock; The inner of described arc lockplate is passed described first mount pad and is stretched to inside, backrest lower end, and can be movable in inside, backrest lower end, and described second spring withstands the inner of described arc lockplate; The outer end of described arc lockplate is provided with at least one locking teeth, has the arc slot that described arc lockplate passes through on the described first cradle head part, and the described first upper end inwall that rotates rod member is provided with and the suitable wave tooth of described locking teeth; Described by-pass cock comprises button portion and the adjusting rod that is in the angle of cut, and turning by bearing pin of described adjusting rod is installed in inside, backrest lower end, and the end of adjusting rod is connected with the inner of described arc lockplate by strengthening iron core.

10. the chair that backrest as claimed in claim 9 can move forward and backward is characterized in that: described locking teeth has three and evenly distribution.

11. the chair that can move forward and backward as each described backrest of claim 1 to 6, it is characterized in that: the described first cradle head part is done by the 3rd screw rod and described first mount pad and is removably connected, and described first upper end of rotating rod member has and is used for the through hole that described the 3rd screw rod passes through; The inner of the described first cradle head part is designed to butterfly structure, is designed to the inner shape adapting with the described first cradle head part in described first mount pad.

12. a rotating mechanism that is used for chair is connected between back lower end avris and the chair base rear end avris, it is characterized in that:

Adjusting can be rotated relative to seat support in the lower end of described rotating mechanism, adjusting can be rotated relative to backrest in the upper end of described rotating mechanism, and in the rotation adjustment process of described rotating mechanism, described backrest is that relative seat support moves forward and backward and the vertical state of backrest remains constant;

Described rotating mechanism comprises that first rotates rod member, second rotation rod member, the first cradle head part and the second cradle head part;

The described first rotation rod member is a hollow type, is dumbbell shaped substantially, and two ends are cylinder type greatly up and down, and interlude is strip for a short time;

Described second rotates the rod member two ends has circular hole;

The described first cradle head part is cylindric substantially, and interlude is big and inside and outside two sections little; First mount pad of described first cradle head part and described backrest lower end avris is connected and fixed, and the inner of the first cradle head part embeds in described first mount pad;

The described second cradle head part also is cylindric substantially, and interlude is big and inside and outside two sections little, and this second cradle head part is fixedlyed connected by screw with second mount pad of described chair base rear end avris, and the inner of the second cradle head part embeds in described second mount pad;

Radially have first groove in the described first cradle head part, and have first axis hole vertically; Described second upper end of rotating rod member is in described first groove, and inserts described first axis hole and second by first axostylus axostyle and rotate the circular hole realization second rotation rod member of rod member upper end and being rotatably connected of the first cradle head part;

Radially have second groove in the described second cradle head part, and have second axis hole vertically, described second lower end of rotating rod member is in described second groove, and inserts described second axis hole and second by second axostylus axostyle and rotate the circular hole realization second rotation rod member of rod member lower end and being rotatably connected of the second cradle head part;

The outer end that the described first cradle head part is entangled in described first upper end of rotating rod member, the outer end that the described second cradle head part is entangled in described first lower end of rotating rod member; Described first upper end of rotating rod member has first center hole, and first lower end of rotating rod member has second center hole; Have first centre bore on the described first cradle head part, have second centre bore on the described second cradle head part;

Described rotating mechanism also comprises first screw rod and second screw rod, and this a two screw rods all rear has external screw thread, and all the other bar sections are the polished rod section; Described first screw rod passes behind described first center hole and described first centre bore precession more successively and is opened in the screw in described first mount pad, described second screw rod passes behind described second center hole and described second centre bore precession more successively and is opened in the screw in described second mount pad, and guarantee that described first upper end of rotating rod member can be rotated relative to first screw rod, first lower end of rotating rod member can be rotated relative to second screw rod;

The line of first centre bore and first axis hole parallels with the line of second centre bore and second axis hole, and the line of first centre bore and second centre bore parallels with the line of first axis hole and second axis hole.

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