CN103445548B - Chair armrest height adjustment structure - Google Patents

Abstract

A chair armrest height adjusting structure comprising: the lower part of the tube seat body is connected with a seat, the upper part of the tube seat body is provided with a plurality of positioning holes, and each positioning hole is communicated with a long guide hole; an outer sleeve is sleeved outside the pipe seat body, and the upper end of the outer sleeve is provided with an opening; a strip frame, which is arranged in the outer sleeve and positioned in the tube seat body, and the lower part of the strip frame is provided with a through groove; a pull handle arranged in the strip frame; a positioning piece which is arranged at the lower end of the pull handle and passes through the through groove of the strip frame to be buckled in the positioning hole of the tube seat body; a pressing piece which is connected with the upper end of the pull handle through the opening on the outer sleeve; and a contraposition mechanism which is arranged on the corresponding surfaces of the strip frame and the pull handle and is used for limiting the stroke when the pull handle and the strip frame relatively move up and down and providing a contraposition effect to improve the assembly convenience.

Description

Chair armrest height adjustment structure

technical field

The invention relates to a structure for adjusting the height of the armrest of a chair, especially a structure suitable for thin shells, and uses an alignment mechanism to facilitate assembly between the handle and the long frame, and can also be used as a limit for adjusting the up and down displacement of the armrest of the chair. The height adjustment structure of the armrest of the chair.

Background technique

In addition to various designs for the armrests of the current chairs to choose from in appearance and style, in order to improve the sitting effect of the sitter more comfortably, the seat can be equipped with an armrest height adjustment device according to the size or needs of the sitter, and related There are too many adjustment devices to enumerate, but the structure of their buckles is ingenious and different.

Such as China Taiwan New Patent Announcement No. 557741 "Height Adjustment Structure of Office Chair Armrest", the deficiency of this method is: in order to make both the outer casing seat and the bracket piece can be engaged and fixed for height adjustment, therefore, the The first and second baffles and the support piece in the pipe seat need to be provided with cross-recessed holes. The relationship between these components is complicated, and it takes a lot of time to assemble; Formed by the angle, its lower part is locked at the bottom of the seat to support the weight of the armrest and the user's arm. Usually, the entire support piece is made of metal material, so that the entire armrest with adjustable height is cheaper to manufacture. high.

Such as China Taiwan's new patent No. M342811 "seat armrest lifting device", the deficiency of this method is: in order to make both the connecting sleeve and the movable sleeve can be engaged and fixed for height adjustment, therefore in the movable sleeve A bracket, a perforation and a guide groove are provided on the fitting part to cooperate with the control part, and a hook part and a guide protrusion are arranged on the control part, and the action relationship between the guide protrusion and the guide groove is used to guide the control part. The stroke of the swing of the control part, the structure of this kind of components is complicated, and it takes a lot of time to assemble; and the swing of the above-mentioned control part is like a seesaw swing, and the user uses the swing of the control part to indirectly control the connecting sleeve. The engaging relationship between the pipe and the movable sleeve makes the accuracy of the engaging and positioning poor in the actual swinging action, thus reducing the stability of adjusting the height of the armrest.

For example, China Taiwan New Patent Announcement No. M308021 "Segmentless Lifting Handrail Structure", the lack of this method is that: pushing the action part can only rotate the first and second teeth of the gear to correspond to the height adjustment of the first to second teeth of the rack, so The adjustment is slow. If there is a large distance to adjust the height, it is necessary to press the action part repeatedly to achieve the adjustment effect, which is extremely laborious and difficult to operate.

However, many existing armrest height adjustment structures are usually made of metal materials or thicker plastics in order to strengthen their structural strength, and even have reinforcing ribs to strengthen their structural strength, which not only makes the product structure complicated but also Manufacturing costs are high. In addition, many chair armrest height adjustment structures still have complex structures, so the number of molds used cannot be reduced, and the thin shell structure cannot be designed.

Therefore, in view of the above-mentioned, and different improvement designs are made for the spatial pattern of the structure or the number of components or the degree of difficulty in operation, etc., it is expected to produce considerable differences in structure with the existing ones, or to improve Use efficiency, or reduce cost to increase competitiveness; and the present invention is designed under such circumstances and is superior to the height adjustment structure of the aforementioned chair armrest.

Contents of the invention

The main purpose of the present invention is to provide a chair armrest height adjustment structure. The technical problem to be solved is that the prior art armrest height adjustment structure has many deficiencies in poor design, and it is necessary to improve it.

The height adjustment structure of the chair armrest of the present invention is improved according to the prior art, and has many advantages as follows:

In the present invention, the mold design is used to form an alignment mechanism between the long frame and the handle, which makes it easy to assemble between the long frame and the handle, and at the same time, it can be used as a limit for the up and down displacement stroke, which improves the convenience of assembly and mold making. and reduce production costs.

In the present invention, two corresponding grooves are directly formed on the mold surface of the pipe seat body, and the two ends of the C-shaped ring for anti-shaking can be embedded and positioned correspondingly, which improves the convenience of making the mold and reduces the manufacturing cost.

The positioning piece in the present invention is provided with a slope-shaped protrusion, which is automatically snapped into the uppermost positioning hole of a plurality of longitudinally spaced positioning holes by virtue of the protrusion during assembly and is positioned without falling out. To improve the convenience of assembly.

The pressing part in the present invention is provided with a buckle structure for buckling on the edge of the corresponding opening of the outer sleeve to improve the combination and positioning effect of the pressing part, and to prevent the existing pressing parts from being combined in a male-female fit. The disadvantage of easy breakage.

Therefore, the height adjustment structure of the chair armrest of the present invention includes:

A pipe seat body, the lower part of which is connected to a chair seat, and a side surface of the upper part of the pipe seat body is provided with a plurality of longitudinally spaced positioning holes, and each positioning hole is also connected by a longitudinal long guide hole;

An outer sleeve, which is sleeved on the outside of the tube base body, an armrest pad is installed on the top surface of the outer sleeve, and an opening is provided at the upper end of the outer sleeve;

A long frame, which is installed in the outer sleeve and located in the tube seat body, a groove is formed in the middle of the long frame along its length direction, and an opening is provided on the upper part of the long frame to correspond to the outer The opening of the sleeve, the lower part of the strip frame is provided with a slot to correspond to the positioning hole of the tube seat body;

a pull handle, which is arranged in the groove of the elongated frame, and the upper end of the handle is provided with a post to correspond to the opening of the elongated frame and the opening of the outer sleeve;

A positioning part, which is installed on the lower end of the handle, and can be driven by the handle to move, and one end of the positioning part is provided with a buckle part for passing through the slot of the elongated frame to be buckled on the pipe seat One of the positioning holes on the body;

A pressing part, which is connected to the boss of the handle, and the pressing part protrudes outside the opening of the outer sleeve, and the upward displacement of the pressing part can drive the handle to move synchronously relative to the strip the frame moves up and down; and

A positioning mechanism, including at least one pair of protrusions and at least one pair of elongated grooves corresponding to the pair of protrusions, the pair of protrusions and the pair of elongated grooves are respectively arranged on the elongated frame and the handle on the corresponding surface, and enable the projection to move back and forth along the elongated groove, and the length of the elongated groove can be used as a stroke limit for the relative displacement of the pull handle relative to the elongated rack;

Wherein, when the pull handle moves upwards, the buckle portion of the locating member is separated from a locating hole on the tube base body, and the locating member can move up and down to adjust the height of the armrest;

When the pull handle is moved downwards, the buckle part of the locating member is disengaged from a locating hole on the tube base body, and the locating member is buckled in one of the locating holes on the tube base body to form a positioning.

In the height adjustment structure of the armrest of the chair, the through groove further protrudes outside its edge to form a thickness.

The height adjustment structure of the chair armrest, wherein, two opposite sides of the lower end of the pull handle are respectively provided with a guide groove corresponding to each other, and the guide groove extends obliquely downward toward the outside; the positioning member is provided with the buckle The left and right sides of the opposite end of the part protrude to form a guide block respectively, and the two guide blocks are respectively limited in the two guide grooves of the handle and can move along the guide grooves, so that the vertical displacement of the handle can be Converted to the horizontal lateral displacement of the locator.

In the height adjustment structure of the chair armrest, a slope-shaped protrusion is further formed at the end of the buckle part of the positioning member, so that the protrusion can move along the long guide hole of the tube base body.

The height adjustment structure of the armrest of the chair, wherein, one end of the pressing member is provided with a protruding body, and a concave hole is provided on the protruding body to be sleeved on the protruding column of the handle, and the other end of the pressing member is provided with a There is an operation part protruding outside the opening of the outer sleeve for operation.

In the height adjustment structure of the chair armrest, the left and right sides of the convex body further protrude to form a buckle part, so that the buckle part can be buckled on the left and right sides of the edge of the opening of the outer sleeve.

In the height adjustment structure of the chair armrest, the pair of protrusions are formed by protruding outward from the left and right sides of the elongated frame, and the pair of elongated grooves are formed by inward depression of the left and right sides of the handle.

The height adjustment structure of the chair armrest further includes at least one C-shaped ring, the C-shaped ring is sleeved on the upper part of the tube seat body, matched with the two ends of the C-shaped ring, and the upper part of the tube seat body is provided with a There are two grooves corresponding to the two ends, so that the two ends can fit into the two grooves.

The height adjustment structure of the armrest of the chair further includes an elastic piece, the elastic piece is arranged between the long frame and the handle, and the long frame is provided with a stopper to touch the elastic piece One end of the pull handle is provided with a stopper to touch against the other end of the elastic member.

In the height adjustment structure of the chair armrest, the opening of the outer sleeve further protrudes outside the edge of the opening to form a thickness.

Therefore, the present invention can reduce the number of moulds, the convenience of making moulds, reduce the production cost, and is also suitable for the design structure of thin shell, so as to achieve the optimal design of products.

Description of drawings

Fig. 1 is the appearance schematic diagram of the height adjustment structure of the armrest of the chair of the present invention;

Figure 2 is an exploded view of Figure 1;

Fig. 3 is an exploded view of another perspective of Fig. 2;

Fig. 4 is a combined appearance schematic diagram of the elongated frame, pull handle, positioning part and pressing part of the chair armrest height adjustment structure of the present invention;

Figure 5 is an exploded view of Figure 4;

Fig. 6 is a side view of the positioning part of the height adjustment structure of the armrest of the chair of the present invention;

Fig. 7 is a top view of the pressing part of the height adjustment structure of the chair armrest of the present invention;

Fig. 8 is a sectional view taken on the 8-8 section line of Fig. 1 and illustrates the state diagram before height adjustment;

Fig. 9 and Fig. 10 are state diagrams continuing Fig. 8 and illustrating height adjustment;

FIG. 11 is a continuation of FIG. 10 and illustrates the state diagram after height adjustment is completed.

Explanation of reference signs: pipe seat body 10; positioning hole 11; long guide hole 12; groove 13; outer sleeve 20; opening 21; screw hole 22; Hole 33; Groove 34; Stopping part 35; Pull handle 40; Protruding post 41; Guide groove 42; Stopping part 43; Positioning part 50; Buckle part 51; Convex body 61 ; concave hole 611 ; operating part 62 ; buckle part 63 ; alignment mechanism 70 ; bump 71 ; elongated groove 72 ; C-ring 80 ; end 81 ;

detailed description

In order to make the present invention more definite and detailed, the preferred embodiments are listed hereby in conjunction with the following diagrams, and the structure and technical characteristics of the present invention are described in detail as follows:

Please refer to Figures 1 to 7, which are the schematic appearance, exploded view, assembly and exploded view of some components, the side view of the positioning part, and the top view of the pressing part of the height adjustment structure of the chair armrest of the present invention. It includes a socket body 10 , an outer sleeve 20 , a long frame 30 , a pull handle 40 , a positioning member 50 , a pressing member 60 and an alignment mechanism 70 . The tube base body 10 can be connected to a chair seat, the outer sleeve 20 is sleeved on the outside of the tube base body 10, the positioning member 50 is assembled at the lower end of the handle 40, and the handle 40 is connected to the handle 40. The long frame 30 is assembled in the outer sleeve 20 , the pressing member 60 is mounted on the upper end of the handle 40 , and the alignment mechanism 70 is disposed between the long frame 30 and the handle 40 . Thus, the pressing member 60 is operated to move upwards to drive the handle 40 to move upwards synchronously, and then the outer sleeve 20 can be adjusted to move up and down relative to the socket body 10 . When the member 60 is adjusted up and down, the travel limit of the displacement of the pull handle 40 relative to the elongated frame 30 is limited.

The lower part of the tube base body 10 is connected to a seat, and the upper part is provided with a plurality of longitudinally spaced positioning holes 11 , and each positioning hole 11 is also communicated with a longitudinal long guide hole 12 . The outer shape of the socket body 10 can be L-shaped, but not limited, such as I-shaped (not shown).

The outer sleeve 20 is sleeved on the outside of the tube base body 10, and an opening 21 is provided at the upper end; the top surface of the outer sleeve 20 can be provided with an armrest pad 100 for the occupant to lean on; The front and rear ends of the top surface of 20 (viewed in the direction of the person sitting) are respectively provided with screw holes 22 for locking screws to pass through and locked in the strip frame 30 and the armrest pad 100; the outer sleeve 20 can It is made of plastic material, and can be integrally made by injection molding process in a thin shell mode, so as to simplify the manufacturing process, reduce weight, reduce cost, and improve the convenience of assembly.

The strip frame 30 is a T-shaped strip frame 30, and is installed in the outer sleeve 20 and is located in the tube seat body 10; the middle of the strip frame 30 is formed along the length direction of the strip frame 30 A groove 31, the top of which is provided with a through hole 32 corresponding to the screw hole 22 of the outer sleeve 20, and a locking screw can be used to pass through the through hole 32 and the screw hole 22 to make the long frame 30 1. The outer sleeve 20 and the armrest pad 100 are locked and combined; the upper part of the bar frame 30 is provided with an opening 33 corresponding to the opening 21 of the outer sleeve 20, and the lower part is provided with a corresponding pipe seat A through groove 34 of a plurality of positioning holes 11 on 10, the through groove 34 is further protruded outside its edge to form an appropriate thickness so that the depth of the through groove 34 is increased, that is, the thickness of the elongated frame 30 is increased, to increase structural strength.

The pull handle 40 is arranged in the groove 31 of the bar frame 30, and the upper end of the handle 40 is provided with a post 41, and the post 41 passes through the opening 33 of the bar frame 30 and the outer sleeve. 20, and can move up and down in the opening 33 and the opening 21; the two opposite sides of the lower end of the pull handle 40 are respectively provided with a guide groove 42 corresponding to each other, and the guide groove 42 faces toward The outer side extends obliquely downward.

One end of the positioning member 50 is provided with a buckle portion 51 for passing through the slot 34 of the strip frame 30 to be buckled in one of the positioning holes 11 on the tube base body 10 , and oppositely provided with the buckle portion 51 The left and right sides of the other end respectively protrude to form a guide block 52, and the two guide blocks 52 are respectively limited in the two guide grooves 42 of the pull handle 40 and can move along the guide groove 42; 42 and the guide block 52 of the locating piece 50 are obliquely engaged up and down, so that the vertical displacement of the pull handle 40 is converted into the horizontal and lateral displacement of the locating piece 50, so that the position on the locating piece 50 The buckle portion 51 disengages from a positioning hole 11 on the socket body 10 . As shown in Figure 2, Figure 3 and Figure 6, the end of the buckle part 51 is also designed as a slope-shaped protrusion 511, so that the protrusion 511 can move along the long guide hole 12 of the tube base body 10, and During assembly, the protrusion 511 moves along the above-mentioned long guide hole 12 and snaps into the uppermost positioning hole 11 among the plurality of positioning holes 11 arranged at intervals in the longitudinal direction, and is positioned without falling out, so as to facilitate assembly The convenience when assembling, and will not cause falling off during assembly because the buckle portion 51 has not been inserted into the positioning hole 11 of the socket body 10 .

The pressing member 60 is connected to the upper end of the handle 40 through the opening 21 on the outer sleeve 20; one end of the pressing member 60 is provided with a convex body 61, and a concave hole 611 is provided on the convex body 61 to The boss 41 is sleeved on the handle 40, and the opposite end is provided with an operation part 62, and the operation part 62 protrudes outside the opening 21 of the outer sleeve 20 for the user to operate to make the pressing part 60 up and down. Move, drive this pull handle 40 synchronous action simultaneously. On the left and right sides of the convex body 61 of the pressing member 60, a buckle portion 63 is further respectively protruded, as shown in FIG. 3 , FIG. 5 , and FIG. The left and right sides of the edge of the opening 21 are used to enhance the combination and positioning effect of the pressing member 60, and to avoid the shortcoming that the existing pressing member is easily broken due to the combination of male and female fittings.

The alignment mechanism 70 is arranged on the corresponding surfaces of the strip frame 30 and the pull handle 40, the alignment mechanism 70 includes at least one pair of protrusions 71 and at least one pair of grooves 72, the pair of protrusions 71 and the pair of protrusions The elongated grooves 72 correspond to each other, and the protrusions 71 can move back and forth along the elongated grooves 72 as stroke limits for operating the pressing member 60 to make the handle 40 move relative to the elongated frame 30; moreover, When the user assembles, the aligning mechanism 70 can also provide an aligning function to facilitate the assembly of the pull handle 40 and the elongated frame 30 . As shown in FIG. 3 , FIG. 4 , and FIG. 5 of this embodiment, the pair of protrusions 71 are protruded from the left and right sides of the elongated frame 30 , and the pair of elongated grooves 72 are formed by the left and right sides of the handle 40 . concave formation. The protrusion 71 can be made integrally with the elongated frame 30 by using a mold, and the elongated groove 72 can be made integrally with the handle 40 by using a mold, so as to reduce the number of product molds used.

Please refer to FIG. 2 , the opening 21 on the outer sleeve 20 is further protruded outside the edge of the opening 21 to form an appropriate thickness so that the depth of the opening 21 is increased, that is, the outer sleeve 20 is increased. thickness, so that the structural strength is increased, so that the buckle part 63 on the pressing member 60 can be stably combined with the edge of the opening 21 of the outer sleeve 20, so as to improve the effect of combination and positioning, and can avoid the existing The disadvantage that the pressing parts are easily broken due to the combination of male and female fittings.

Please refer to FIG. 2 and FIG. 3 , the height adjustment structure of the armrest of the present invention further includes at least one C-shaped ring 80, which is arranged between the tube base body 10 and the outer sleeve 20 and is socketed. The upper part of the tube base body 10 is used to provide a stable contact effect between the tube base body 10 and the outer sleeve 20, so that the outer sleeve 20 can move up and down relative to the tube base body 10. Avoid shaking and improve stability; in this embodiment, the upper part of the socket body 10 is provided with two grooves 13 corresponding to the two ends 81 of the C-shaped ring 80 so that the two ends 81 of the C-shaped ring 80 can correspond Embedded and positioned, the two grooves 13 can be directly formed on the side surface 11 of the socket body 10 by using a mold design, so as to simplify the manufacturing process and reduce the manufacturing cost.

Please refer to Figures 2 to 5 and Figures 8 to 11, the height adjustment structure of the armrest of the present invention further includes an elastic member 90, the elastic member 90 can be composed of a compression spring, but not limited, such as a shrapnel, the elastic member 90 is arranged between the strip frame 30 and the pull handle 40, and the strip frame 30 and the pull handle 40 are respectively provided with a stop portion 35, 43 to correspond to the elastic member 90, and make one end of the elastic member 90 The elastic touches against the stop portion 35 of the strip frame 30, and the other end elastically touches against the stop portion 43 of the pull handle 40, by virtue of its elastic characteristics, as the driving force when the pull handle 40 is reset, further It is illustrated that when the pressing member 60 is operated to move the handle 40 upward, the elastic member 90 is compressed, and when the handle 40 is released, the elastic member 90 is used to drive the handle 40 to move downward. reset.

The present invention provides that when the user grasps the outer sleeve 20 or the armrest pad with his hand, he can directly operate the pressing member 60 to move upward to drive the handle 40 to move upward, and by virtue of the handle 40 and the positioning The upward and downward oblique relationship between the two parts 50 makes the positioning part 50 laterally displace inward and make the buckle part 51 on it break away from a positioning hole 11 on the tube base body 10, so that the overcoat The barrel 20 and the strip frame 30 can move up and down freely relative to the tube base body 10 to adjust the height position, and then release the pressing member 60 to reset the pull handle 40 and make the positioning member 50 reverse (outward lateral) displacement And snap into another positioning hole 11 on the tube base body 10 to complete the height adjustment action of the armrest. When the pull handle 40 moves up and down relative to the elongated frame 30 to adjust the height position, at the same time, the protrusion 71 in the alignment mechanism 70 moves relative to the elongated groove 72 and moves along the elongated groove 72 to serve as The travel of the pull handle 40 relative to the displacement of the elongated frame 30 is limited.

Generally, when a person sits, he or she will put his hand on the armrest of the chair to generate a downward force. The present invention can stably bear the above-mentioned downward force by increasing the depth of the groove 34, so that in addition to being able to In addition to increasing the structural strength, the buckle portion 51 of the positioning member 50 can also be stabilized when moving in the slot 34 .

Please refer to FIG. 8 to FIG. 11 , which are schematic side views of the height adjustment structure of the chair armrest of the present invention before, during and after the height adjustment. As shown in FIG. 8 , when the handle 40 is not operated to move upward, the positioning member 50 is located at a higher position of the guide groove 42 of the handle 40 , and the buckle portion 51 of the positioning member 50 is buckled on the tube. There is a positioning hole 11 on the seat body 10 , at this moment, the protrusion 71 of the alignment mechanism 70 is located at a higher position of the elongated groove 72 .

As shown in Figure 9 and Figure 10 (that is, when the height of the armrest is to be adjusted), the pressing member 60 is operated to move upward to drive the handle 40 to move upward (as shown by the arrow A in Figure 9), and the elastic member 90 is pressed into a compressed state, and the projection 71 of the alignment mechanism 70 moves relative to the elongated groove 72, and moves from a higher position of the elongated groove 72 to a lower position along the elongated groove 72 (such as 9), at the same time, by virtue of the up and down oblique relationship between the guide groove 42 of the pull handle 40 and the positioning member 50, the vertical displacement of the pull handle 40 can be converted into that of the positioning member 50. The horizontal and lateral displacement of the positioning member 50 moves from the higher position of the guide groove 42 to the lower position along the guide groove 42, so that the buckle portion 51 of the positioning member 50 moves inward (to the left in the figure). Move away from the positioning hole 11 on the tube base body 10, and allow the positioning member 50 to move up and down freely (as shown by arrow B in FIG. 10 ) to adjust the height of the armrest.

As shown in Figure 11, after being displaced to an appropriate position, release the handle 40 and use the elastic force of the elastic member 90 to drive the handle 40 to move downward (as shown by arrow C in Figure 11) to make the alignment The protrusion 71 of the mechanism 70 moves relative to the elongated groove 72, and moves from the lower position of the elongated groove 72 to a higher position along the elongated groove 72, and at the same time, the positioning member 50 moves from the handle 40 The lower position of the guide groove 42 moves to a higher position along the guide groove 42, so that the buckle part 51 of the positioning member 50 moves outward (to the right in the figure) and is buckled in another positioning hole 11, so The effect of height adjustment can be achieved.

All in all, because the structure for adjusting the vertical displacement of the armrest in the armrest height adjustment structure of the present invention is very simple, and reduces the number of molds used, reduces production costs, reduces assembly time and improves assembly convenience, and is also suitable for thin shells. The design structure is quite different from the existing structure, and at the same time, it can improve the use efficiency and product competitiveness, and achieve the optimal design of the product.

The above description is only a preferred embodiment of the present invention, and it is only illustrative of the present invention, rather than restrictive; those of ordinary skill in the art understand that it can be used within the spirit and scope defined by the claims of the present invention. Many changes, modifications, and even equivalent changes can be made, but all will fall within the protection scope of the present invention.

Claims (5)

1. an armrest height adjusting structure of chair, it is characterised in that comprise:

One pipe seat body, its underpart is connected on a seat support, and the one side on this pipe seat body top is provided with the hole, location of multiple longitudinal separation arrangement, and hole, each location also connects with the long guide hole of a longitudinal direction;

One outer sleeve, it is sheathed on the outside of this pipe seat body, and this outer sleeve end face installs an armrest pad, and this outer sleeve upper end is provided with a perforate;

One strip frame, it is installed in this outer sleeve and is positioned at this pipe seat body, the centre of this strip frame forms a groove along its length, and this strip frame top is provided with a perforate with the perforate corresponding to this outer sleeve, and this strip frame bottom is provided with one and wears groove with the hole, location corresponding to this pipe seat body;

One pull handle, it is located in the groove of this strip frame, the upper end of this pull handle is provided with one by the projection of the perforate of this strip frame with the perforate corresponding to the perforate of this strip frame and this outer sleeve, and the limit, two opposite sides of the lower end of this pull handle is respectively equipped with mutually corresponding and that skew back downwardly extends an outwardly guide groove;

Positioning piece, it is installed in the lower end of this pull handle, and can be driven mobile by this pull handle, one end of this keeper be provided with one clamping part for through this strip frame wear groove be snapped on this pipe seat body wherein one location hole, the end of this clamping part forms the projection of ramped shaped, make this projection can move along the long guide hole of this pipe seat body, the left and right sides of the other end on this keeper is protruded respectively and is formed with a guide block, this two guide block is respectively limited by two guide grooves of this pull handle and can move along this guide groove, make the straight up and down horizontal cross displacement converting this keeper to displacement energy to of this pull handle,

One pressing piece, it is connected to the projection of this pull handle, and the outside of the convex perforate being exposed to this outer sleeve of this pressing piece, one end of this pressing piece is convexly equipped with a convex body, and on this convex body, it is provided with a shrinkage pool to be socketed on the projection of this pull handle, the other end of this pressing piece is provided with an operating portion, for operating with outside the convex perforate being exposed to this outer sleeve of this operating portion, the left and right sides of this convex body is prominent respectively further forms a clamping part, make this clamping part can be buckled in the left and right sides at edge of perforate of this outer sleeve, operate this pressing piece to shift up this pull handle synchronous shift can be driven to move up and down relative to this strip frame, and

One positioning mechanism, comprise at least one pair of projection and elongate recesses that at least one pair of is mutually corresponding to projection with this, this to projection and this elongate recesses is separately positioned on the corresponding surface of this strip frame and this pull handle, projection is outwardly formed by this by the left and right sides of this strip frame, and elongate recesses is concaved lower formation by this by the left and right sides of this pull handle, and enable projection to move back and forth along elongate recesses, and the length of this elongate recesses can as the travel limit of this pull handle this strip frame relative displacement relatively;

Wherein, when this pull handle shifts up so that the clamping part of this keeper departs from the hole, location on this pipe seat body, and this keeper is enable to move up and down to adjust the high and low position of handrail;

When this pull handle is to bottom offset so that the clamping part of this keeper departs from the hole, location on this pipe seat body, and this keeper is made to be buckled in formation location in the wherein hole, location on this pipe seat body.

2. armrest height adjusting structure of chair as claimed in claim 1, it is characterised in that this is worn groove and protrudes formation one thickness further outside its edge.

3. armrest height adjusting structure of chair as claimed in claim 1, it is characterized in that, comprise at least one C-shaped ring further, this C-shaped ring is socketed in the top of this pipe seat body, coordinate two ends of this C-shaped ring, be provided with on the top of this pipe seat body to should two grooves of two ends so that this two end can embed this two groove.

4. armrest height adjusting structure of chair as claimed in claim 1, it is characterized in that, comprise an elastic component further, this elastic component is located between this strip frame and this pull handle, this strip frame is provided with a stop section to touch the one end being butted on this elastic component, and this pull handle is provided with a stop section to touch the other end being butted on this elastic component.

5. armrest height adjusting structure of chair as claimed in claim 1, it is characterised in that the perforate of this outer sleeve is protruded outside the edge of perforate further and formed a thickness.