CN211704073U - Movable armrest enabling chair back to have backward tilting function and chair - Google Patents

Abstract

The utility model discloses a make the back of the chair have activity handrail of function of heeling back, including handrail body and handrail support, the handrail body has sliding channel, sliding channel is in the handrail body is equipped with rear end opening, lower part opening, the rear end opening is put into and to be followed sliding channel slides and is used for connecting the support of the back of the chair, the lower part opening part is equipped with the limited movable part of activity, the movable part has the fastener, fastener effect/do not be in spacing/release spacing to the support during support. The beneficial effects of the utility model reside in that, it is not simple and convenient enough to have solved prior art and controlled to control the technical problem that has the safety risk, make the user have better experience of controlling.

Description

Movable armrest enabling chair back to have backward tilting function and chair

Technical Field

The utility model relates to a make the back of the chair have activity handrail and chair of function of facing back backward, relate to the production technical field of chair.

Background

In order to improve comfort, an office chair or a leisure chair is provided with a function that a chair back can be reclined, and the function is mostly realized through a tray of the chair and a structure related to the tray. For example, publication No. CN205214731U discloses an office chair with a tilting connection tray and a lifting leg rest mechanism, wherein the connection tray is provided with a tilting frame, the tilting frame is provided with a torsion spring tightly attached to a connection plate, the upper part of the connection plate is connected to a chair back, if the chair is tilted backwards, a cam handle linked with the tilting frame is released, a human body leans backwards to drive the chair back to tilt backwards, and when the required tilting angle is reached, the cam handle is locked.

This way of manipulating the back of the chair is disadvantageous: the cam handle is positioned below the chair seat, so that a user cannot observe the position of the cam handle when sitting up, and the operation is inconvenient; in addition, the user may need to bend the upper half body to hold the cam handle, and when the user bends the upper half body when adjusting the optimal reclining angle, the adjusted reclining angle may be changed.

Aiming at the defects, the technical problem can be solved by arranging the part for controlling the reclining function of the chair back at a position which is more convenient for the user to operate. As publication number CN208972999U discloses a massage office chair with adjustable back of chair for work, the draw-in groove frame has been seted up on the one end lower part position of handrail, a plurality of draw-in grooves have been seted up to the below of draw-in groove frame, and the groove of stepping down has been seted up at handrail support top, has installed the locating lever in the groove, the draw-in groove with the locating lever adaptation is mentioned the handrail during use, and draw-in groove frame breaks away from with the locating lever, and the back of the chair has lost the limiting displacement of handrail this moment and can rotate, and when the back of the chair rotation inclination is adjusted satisfied back, impresses the groove of stepping down with the draw-in groove frame for another draw-in. Although the control handle is more convenient than the control cam handle, the structure has the defects of control: firstly, the armrest needs to be lifted or pressed down during operation, the whole upper limb of a user needs to make corresponding actions, and the operation mode is not simple enough; secondly, if the user repeatedly adjusts the backward angle, the user needs to keep the lifting state of the armrest, and the user may feel uncomfortable with the arms due to acid and numb, so that the user experience is not good; in addition, when the slot clamping frame is separated from the positioning rod, the back of the chair completely loses the supporting effect on the back, if the back of a user is tightly attached to the back of the chair to tilt backwards to adjust the tilting angle, danger is easy to occur, and if the back of the user is not tightly attached to the back of the chair to tilt backwards, the back of the chair cannot be adjusted to the most comfortable tilting angle at one time.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a movable armrest that makes the back of the chair have the function of leaning back, it is not simple and convenient enough to have solved prior art and controlled to control the technical problem that has the potential safety hazard, make the user have better experience of controlling.

The utility model discloses a realize through following technical scheme.

The utility model provides a make the back of the chair have activity handrail of function of facing backward, includes handrail body and handrail support, the handrail body has sliding channel, sliding channel is in the handrail body is equipped with rear end opening, lower part opening, the rear end opening is put into and to be followed sliding channel slides and is used for connecting the support of the back of the chair, the lower part opening part is equipped with the limited movable part of activity, movable part has the fastener, the fastener is used/does not be used in spacing/release spacing to the support during support.

The prior art adopts the control mode that the armrest is lifted up and pressed down, the whole upper limb is required to be used, the movable part arranged in the utility model is positioned at the lower opening of the armrest body, the movable part is only required to be controlled by hands, the locking state/the moving state of the chair back is realized by limiting/releasing the limit of the bracket by the clamping piece, and the control mode is simplified; in addition, because the support is arranged in the sliding channel of the armrest body, even if the limiting of the support by the clamping piece is relieved, a certain frictional resistance exists between the support and the armrest body, so that the chair back is not in a complete moving state, and the potential safety hazard when the back of a user is tightly attached to the chair back to adjust the back is avoided.

As a further improvement, the front end of the support and the front end of the sliding channel are connected and provided with an elastic restoring piece, and the elastic restoring piece is always in a stretching state. When a user needs to adjust the backward tilting angle of the chair back to be small or to return to a normal state, the elastic restoring piece can pull the support to contract back to the sliding channel only by controlling the movable part to release the limit on the support, and the chair is very simple and convenient; on the contrary, when the user adjusts the chair back to the backward tilting state from the normal state, the elastic restoring piece has a pulling effect on the support, and the safety factor of the user when the back of the user clings to the chair back to tilt backward can be further improved by matching with the friction effect of the handrail body of the support.

In order to make the back of the chair pitch angle have more choices, as the utility model discloses a further improvement, the support is equipped with a plurality of draw-in grooves that match with the fastener along the direction of sliding, the movable part is equipped with the lug, the fastener is fixed the lug.

Considering movable part as the part that the user directly controlled, its structure has decided the simple and convenient degree of control, consequently as the utility model discloses a further improvement, movable part's middle part is equipped with the axle piece of perpendicular to its slip direction, movable part with the axle piece is rotatable as the pivot, the fastener is located movable part's rear end. The user only needs to use the finger to promote anterior segment or back end of movable part and can control, compares in prior art and need use whole upper limbs to control, and this scheme can be simplified to only using the finger to control, and user's simple and convenient degree of controlling has very big superiority.

In order to further optimize the utility model discloses an experience of controlling, as the utility model discloses a further improvement, the axle piece can be in a limited range lift slip. Due to the action of gravity, the shaft piece is located at the lowest position when the user does not operate the movable part, and no matter the movable part limits the support or releases the limit in the state, compared with the scheme that the shaft piece cannot move, the front section or the rear section of the movable part is partially exposed outside the armrest body or more parts are exposed, so that the operation experience of the user is further optimized; and when the movable part is pushed, the two motion states of the rotation and the lifting sliding of the movable part are not interfered with each other, and the function of the movable part is not influenced.

In order to further improve the stability of movable part to the support is spacing, as the utility model discloses a further improvement, be equipped with the locking piece in the sliding channel, the locking piece is used in the movable part, and prevent under the non-atress state of movable part the fastener breaks away from the draw-in groove.

The locking piece can be set as a recovery spring which is connected between the front end of the movable part and the front end of the sliding channel, and the elastic force generated by the recovery spring can enable the movable part to always have a tendency of rotating, so that the state that the clamping piece is clamped into the clamping groove can be kept, and the state is extremely stable; the locking piece also can set up to the elasticity door that the draw-in groove notch seals, and the width setting that elasticity door sealed is less than the fastener, and the user promotes the movable part using certain dynamics, and elasticity door seals is by the fastener extrusion and compressive deformation, behind the draw-in groove was gone into to the fastener card, elasticity door seals the shape recovery, can arrive the effect that the prevention fastener breaks away from the draw-in groove.

In order to avoid the rotation amplitude of the movable part to be too large, the utility model discloses a further improvement, the support has along the direction setting of sliding and closed elongated slot, and is a plurality of the draw-in groove is located a side of elongated slot, the fastener is located in the elongated slot. The clamping piece is arranged in the long groove, the moving range of the clamping piece is limited, and therefore the rotating amplitude of the moving part is limited, on one hand, if the situation that the operating force is too large is generated, the long groove can avoid the situation that the rotating amplitude of the moving part is too large to cause the damage caused by collision with other parts of the handrail body, and on the other hand, the situation that the fingers of a user are inserted into the handrail body to cause the injury due to too large rotating amplitude can also be avoided.

As a further improvement, the rear end of support is equipped with and is greater than rear end open-ended back of the chair connecting piece, back of the chair connecting piece is equipped with the bar groove, and the back of the chair is equipped with the connecting axle, the connecting axle slides and sets up the bar inslot. The chair back connecting piece is used as a part for connecting the chair back, and on the other hand, the chair back connecting piece is larger than the rear end opening, so that the phenomenon that the chair back tilts forwards due to the fact that the support is excessively retracted into the armrest body can be avoided. In addition, when the chair back connecting piece is tightly attached to the opening at the rear end, the bracket is located at the initial position, and the chair back can be set to be in a normal state.

When the back of the chair was faced back gradually, the connecting axle of the back of the chair also slided in the bar groove thereupon, and slight slope also can take place for the seat support, consequently the connecting axle has certain incline to the slip direction of the relative seat support of effort direction of back of the chair connecting piece under this state, leads to front end, the rear end of support to have the trend of upswing, downswing respectively, for solving this problem, conduct the utility model discloses a further improvement, this internal backup pad that is equipped with of handrail conduct slide channel's roof and with support sliding fit, the bottom plate of handrail body conduct slide channel's diapire and with support sliding fit, the roof of handrail body with a plurality of connecting pieces of fixedly connected with between the backup pad. The bottom plate of backup pad and handrail body can play the guide effect to the support, avoids the support to appear the condition of slope in the slip in-process, reduces the loss that the local excessive friction of support and handrail body caused, can also set up corresponding sliding tray at the bottom plate of backup pad or/and handrail body to roof, the bottom plate at the support matches the structure that corresponds, strengthens the guide effect. In addition, the support plate not only has a guide function on the support, but also has a supporting and fixing function on the top plate of the handrail body, the upper part of the handrail body is of a hollow structure, the top plate of the handrail body is arranged on the support plate through the connecting piece, and production materials of the handrail body can be reduced.

The utility model provides a chair with above-mentioned movable armrest, still includes seat support, the back of the chair and landing leg, movable armrest is equipped with two and respectively fixed mounting in the both sides of seat support, the back of the chair about the side respectively with movable armrest's leg joint, the landing leg is installed the bottom of seat.

The utility model provides a movable armrest not only can be used at office chair, leisure chair, also can use at electronic contest chair, massage armchair, deck chair etc..

The utility model has the advantages that:

(1) the utility model is provided with the slidable bracket which is arranged in the sliding channel of the handrail body, and the movable part is arranged as the control part, so that the user can complete the control by using the hand, and the user has better control experience;

(2) the utility model can avoid the potential safety hazard when the back of the user is clung to the chair back to lean backwards through two means of the friction action of the movable handrail on the bracket and the pulling action of the elastic part, thereby improving the safety factor of the user operation;

(3) the structure characteristics and the moving mode of the movable part of the utility model ensure that the user can control the limit or release the limit of the movable part to the bracket only by using fingers, thereby further optimizing the simple degree of control;

(4) the utility model, by arranging the locking piece, strengthens the limit function of the movable part to the bracket, improves the stability of the backward leaning state of the chair back, and further improves the safety factor of the product;

(5) the utility model arranges the closed elongated slot on the bracket, thereby limiting the maximum rotation range of the movable part, avoiding the collision between the movable part and other parts of the handrail body caused by the overlarge rotation amplitude, and avoiding the injury of the hand of the user;

(6) the utility model discloses thereby the back of the chair connecting piece that sets up can avoid the support excessively to contract and make the back of the chair incline, and this internal backup pad that sets up of handrail leads to the slip of support simultaneously, can avoid the back of the chair connecting piece to receive the support slope problem that the back of the chair effort leads to.

Drawings

FIG. 1 is a schematic view of a movable armrest for a chair back with a reclining function according to embodiment 1;

fig. 2 is a schematic sectional view of the movable armrest of embodiment 1 for providing the backrest with a reclining function (the bracket is in a limiting state);

FIG. 3 is a schematic structural diagram of the bracket and the movable member in embodiment 1 (the bracket is in a position-limiting state);

FIG. 4 is a schematic structural view of a stent of embodiment 1;

FIG. 5 is a schematic view of the movable armrest of embodiment 2 for providing reclining function to the backrest;

FIG. 6 is a schematic sectional view of the movable armrest of embodiment 2 for providing the reclining function to the backrest (the bracket is in a limiting state);

FIG. 7 is a schematic sectional view of the movable armrest of embodiment 3 for providing the backrest with reclining function (the bracket is in a limiting state);

FIG. 8 is a schematic sectional view of the movable armrest of embodiment 4 for providing the backrest with reclining function (the bracket is in a limiting state);

fig. 9 is a schematic sectional view of the movable armrest according to embodiment 5, which allows the backrest to have a reclining function (the bracket is in a limiting state).

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1:

referring to fig. 1 and 2, the movable armrest for a chair back with a reclining function includes an armrest body 1 and an armrest support 2, wherein the armrest body 1 and the armrest support 2 are integrated into a whole, or can be separately disposed and fixedly connected by using a fastener, and the armrest support 2 is provided with a plurality of mounting holes 20 for mounting the armrest support on the chair. The armrest body 1 is provided with a sliding channel 10, the sliding channel 10 is provided with a rear end opening 10-A and a lower opening 10-B on the armrest body 1, the rear end opening 10-A is provided with a bracket 3 which can slide along the sliding channel 10 and is used for connecting a chair back, and a movable part 4 is arranged at the lower opening 10-B.

Referring to fig. 3 and 4 in combination with fig. 2, a long groove 30 is provided at the front of the bracket 3, the long groove 30 is arranged to be closed along the sliding direction of the bracket 3, in this embodiment, a plurality of slots 31 are provided along the sliding direction of the bracket 3 at the side edge of the long groove 30 located above, each slot 31 corresponds to a tilt-back angle of the chair back, and the number of the slots 31 is set according to the angle. A shaft 41 is disposed in the middle of the movable member 4, the shaft 41 is perpendicular to the sliding direction of the movable member 4, two ends of the shaft 41 are respectively connected to two sidewalls of the armrest body 1, and the movable member 4 can rotate with the shaft 41 as a rotation shaft. The rear end of the movable part 4 is provided with a pair of convex lugs 44-1 which protrude upwards, a clamping piece 44 is fixedly arranged between the pair of convex lugs 44-1, the clamping piece 44 is of a rod-shaped structure, the clamping piece 44 is positioned in the long groove 30, the moving range of the clamping piece 44 is limited by the long groove 30, the shape of the clamping groove 31 is matched with that of the clamping piece 44, when the clamping piece 44 is clamped in the clamping groove 31, the movable part 4 limits the bracket 3, and the position of the chair back at a certain reclining angle is locked. When the user pushes the front section 42 of the movable part 4 upwards, the movable part 4 rotates counterclockwise (as viewed in fig. 2), the rear section 43 of the movable part 4 swings downwards, the clip 44 at the rear end of the movable part 4 is separated from the clip groove 31, i.e., the limit on the bracket 3 is released, and the bracket 3 can slide along the sliding channel 10, so as to adjust the reclining angle of the chair back.

The front end of the sliding channel 10 is provided with a fixed plate 11, a recovery spring which is always in a compression state is connected between the front end of the movable part 4 and the fixed plate 11, the recovery spring is a locking part 5-a, and the recovery spring is always in the compression state, so that under the action of the elastic force of the recovery spring, the movable part 4 always has a trend of clockwise rotation, when a user stops pushing the movable part 4 upwards, under the action of the locking part 5-a (recovery spring), the clamping piece 44 can be clamped into the clamping groove 31, and the state that the clamping piece is clamped into the clamping groove 31 and is not separated is kept, namely, the support 3 is limited. In this embodiment, the bottom surface of the front section 42 of the movable member 4 is provided with a groove matching the shape of a finger, so as to prevent the user from slipping when pushing.

The back end of the support 3 is provided with a chair back connecting piece 32, the chair back connecting piece 32 is provided with a strip-shaped groove 320, the chair back is provided with a connecting shaft 3-A, and the connecting shaft 3-A is arranged in the strip-shaped groove 320 in a sliding mode, so that the chair back connecting piece 32 is connected with the chair back in a first action mode. In addition, the seat back link 32 is larger than the rear end opening 10-a, so that the second function of the bracket 3 is to avoid excessive retraction into the slide channel 10, which may cause the seat back to tilt forward. In this embodiment, when the backrest connecting member 32 is tightly attached to the rear opening 10-a, the backrest is set to be in a vertical state, i.e., a normal state without reclining. Fixed plate 11 is equipped with fixed column 12, fixed column 12 with it restores elastic component 33 to be connected to set up between the front end of support 3, it is in tensile state all the time to restore elastic component 33. Considering that the sliding channel 10 inside the handrail body 1 has limited space, and the handrail body 1 is usually made of plastic, and the structural strength of the handrail body is limited, the fixing plate 11 and the fixing post 12 are provided as the fixed connection objects of the restoring elastic member 33, on one hand, the fixing plate 11 and the fixing post 12 occupy a small space, and do not affect the internal structure of the handrail body 1, and on the other hand, the restoring elastic member 33 is connected through the fixing post 12, so that the direct connection to the handrail body 1 can be avoided, and the adverse factor on the structural strength can be avoided. When a user needs to adjust the reclining angle of the chair back to a small value or to a normal state, the movable part 4 is operated to release the limit of the bracket 3, and the bracket 3 retracts into the sliding channel 10 under the pulling action of the elastic restoring piece 33. In addition, the elastic restoring member 33 of the present embodiment is a restoring spring. In addition, when the back of the user is tightly attached to the chair back to adjust the tilting-back angle, the elastic restoring piece 33 stretches and the armrest body 1 and the support 3 rub against each other, so that the chair back can support the back of the user to a certain extent, and potential safety hazards during operation and control can be avoided.

A support plate 13 is arranged in the armrest body 1, the support plate 13 serves as a top wall of the sliding channel 10, and a bottom plate 14 of the armrest body 1 serves as a bottom wall of the sliding channel 10. The supporting plate 13 and the bottom plate 14 of the armrest body 1 are in sliding fit with the top surface and the bottom surface of the bracket 3. When the support 3 slides, the action force of the chair back on the support 3 through the connecting shaft 3-a may have a certain inclination relative to the sliding direction of the support 3, so the support plate 13 and the bottom plate 14 of the armrest body 1 can guide the support 3, and the phenomenon that the support 3 tilts in the sliding process is avoided.

The upper part of the handrail body 1 is of a hollow structure, the top plate 15 of the handrail body 1 is a plate-shaped member and is fixedly connected to the support plate 13 through a plurality of connecting members 16, and the connecting members 16 can be fastening screws. The top plate 15 is configured as an arc-shaped plate in consideration of the comfort of the user when the user's arm is placed on the top plate 15, and a soft paper sheet or a fiber layer may be thermally adhered to the surface of the top plate 15.

Example 2:

referring to fig. 5 and 6, in the movable armrest having the reclining function of the seatback, the connection relationship between the shaft 41 of the movable member 4 and the armrest body 1 is different from that of embodiment 1. In this embodiment, the two side surfaces of the armrest body 1 are provided with sliding grooves 1-a, and the two ends of the shaft 41 of the movable part 4 are slidably mounted in the two sliding grooves 1-a, respectively, so that the movable part 4 can slide up and down within the limited range of the sliding grooves 1-a. When the card 44 is clamped into the clamping groove 31, the movable member 4 is located at the lowest position of the sliding groove 1-a due to the action of gravity and the locking member 5-a (restoring spring), and the movable member 4 is in a certain inclined state, so that the part of the front section 42 of the movable member 4 exposed out of the armrest body 1 is more than that of the embodiment 1, so that the front section 42 of the movable member 4 is easier to operate by a user, when the user pushes the front section 42 upwards, the movable member 4 can integrally slide upwards and rotate anticlockwise, the two motion states of the movable member 4 cannot interfere with each other, the rear section 43 of the movable member 4 swings downwards to enable the card 44 to be separated from the clamping groove 31, and the movable member 4 releases the limit of the support 3. When the user loosens the front section 42 of the movable part 4, the movable part 4 rotates clockwise and slides downwards, the clamping piece 44 is clamped in the clamping groove 31, and the movable part 4 limits the bracket 3.

Example 3:

referring to fig. 7, the arrangement of the locking member is different from that of embodiment 1 in a movable armrest for providing a reclining function to a seat back. In this embodiment, the locking member 5-B is a resilient dock seal, the locking member 5-B (resilient dock seal) is disposed in the notch of each of the locking slots 31, and the width of the locking member 5-B (resilient dock seal) is smaller than the catch 44. When a user pushes the rear section 43 of the movable part 4 upwards with a certain force, the movable part 4 rotates clockwise, the clamping piece 44 extrudes the locking piece 5-B (elastic door seal) from the outside of the clamping groove 31, the locking piece 5-B (elastic door seal) is compressed until the clamping piece 44 is clamped into the clamping groove 31, at the moment, the shape of the locking piece 5-B (elastic door seal) is restored, the clamping piece 44 is locked in the clamping groove 31 and prevented from being separated from the clamping groove 31, and the movable part 4 is limited to the bracket 3. When a user pushes the front section 42 of the movable part 4 upwards with a certain force, the locking piece 44 extrudes the locking piece 5-B (elastic door seal) from the inside of the clamping groove 31, the locking piece 5-B (elastic door seal) is compressed until the locking piece 44 is separated from the clamping groove 31, and the movable part 4 releases the limit of the bracket 3. In addition, grooves matched with the shapes of fingers are arranged on the bottom surfaces of the front section 42 and the rear section 43 of the movable part, so that a user is prevented from skidding when pushing.

Example 4:

referring to fig. 8, a movable armrest for a chair back with a reclining function combines embodiment 1 and embodiment 3, and has a locking member 5-a (return spring) and a locking member 5-B (elastic door seal), and the movable member 4 is the same as embodiment 3, and the bottom surfaces of the front section 42 and the rear section 43 are both provided with grooves matching the shapes of fingers, and the operation manner is also the same as embodiment 3. Compared with embodiment 3, the state that the clip piece 44 is clipped into the clip groove 31 is more stable, namely, the locking state that the chair back tilts backwards is more stable.

Example 5:

referring to fig. 9, in a movable armrest for a reclining chair back, the position of the slot 30 of the locking groove 31 is different from that of embodiment 3. In this embodiment, a plurality of locking grooves 31 are formed in the side edge of the lower long groove 30 along the sliding direction of the bracket 3, the locking member 5-B is an elastic door seal, and the locking member 5-B (elastic door seal) is disposed in a notch of each locking groove 31. Therefore, in a manner opposite to that of embodiment 3, the user pushes the rear section 43 of the movable part 4 upward to release the position limitation on the bracket 3, and pushes the front section of the movable part 4 upward to limit the position limitation on the bracket 3.

Example 6:

the utility model provides a chair, includes activity handrail, seat support, the back of the chair and landing leg, the activity handrail is equipped with two and respectively fixed mounting in the both sides of seat support, the back of the chair about the side respectively with the leg joint of activity handrail, the landing leg is installed the bottom of seat. The movable armrest is any one of the embodiments 1 to 6.

The above embodiments are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. The utility model provides a make the back of the chair have activity handrail of function of facing backward, includes handrail body (1) and handrail support (2), its characterized in that, handrail body (1) has slide channel (10), slide channel (10) are in handrail body (1) is equipped with rear end opening (10-A), lower part opening (10-B), rear end opening (10-A) are put into and can be followed slide channel (10) slip and are used for connecting support (3) of the back of the chair, lower part opening (10-B) department is equipped with activity limited movable part (4), movable part (4) have fastener (44), fastener (44) are used/do not be in during support (3) to support (3) spacing/release spacing.

2. The armrest as claimed in claim 1, characterized in that an elastic restoring member (33) is connected between the front end of said support (3) and the front end of said sliding channel (10), said elastic restoring member (33) being always in tension.

3. The armrest for reclining a chair back as claimed in claim 1, wherein said support (3) is provided with a plurality of engaging grooves (31) along the sliding direction, said movable member (4) being provided with a protrusion (44-1), said protrusion (44) being fixed to said protrusion (44-1).

4. The armrest as claimed in claim 3, wherein the middle of the movable member (4) is provided with a shaft (41) perpendicular to the sliding direction of the movable member, the movable member (4) is rotatable around the shaft (41), and the latch (44) is located at the rear end of the movable member (4).

5. The armrest as claimed in claim 4, wherein said shaft (41) is slidable up and down within a limited range.

6. The armrest as claimed in claim 4, characterised in that a locking member is provided in said sliding channel (10), said locking member acting on said movable part (4) and preventing said catch (44) from disengaging from said catch (31) when said movable part (4) is in the non-stressed condition.

7. The armrest for reclining a chair back as claimed in claim 3, wherein said support (3) has a closed elongated slot (30) along the sliding direction, said plurality of engaging grooves (31) are located on one side of said elongated slot (30), and said engaging member (44) is located in said elongated slot (30).

8. The movable armrest capable of enabling the chair back to have the reclining function as claimed in claim 1, wherein the rear end of the bracket (3) is provided with a chair back connecting piece (32) which is larger than the rear end opening (10-A), the chair back connecting piece (32) is provided with a strip-shaped groove (320), the chair back is provided with a connecting shaft (3-A), and the connecting shaft (3-A) is slidably arranged in the strip-shaped groove (320).

9. The movable armrest for providing the chair back with the reclining function as claimed in claim 8, wherein a supporting plate (13) is disposed in the armrest body (1) and serves as a top wall of the sliding channel (10) and is in sliding fit with the bracket (3), a bottom plate (14) of the armrest body (1) serves as a bottom wall of the sliding channel (10) and is in sliding fit with the bracket (3), and a plurality of connecting members (16) are fixedly connected between a top plate (15) of the armrest body (1) and the supporting plate (13).

10. A chair having a movable armrest as claimed in any one of claims 1 to 9, further comprising a seat, a backrest, and legs, wherein two movable armrests are provided and fixedly mounted on both sides of the seat, respectively, the left and right side edges of the backrest are connected to the brackets of the movable armrests, respectively, and the legs are mounted on the bottom of the seat.

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