Angle-adjustable office chair with liftable armrests

Abstract

The invention relates to the field of office appliances, in particular to an angle-adjustable office chair with liftable armrests, which comprises a base and a backrest, the backrest is rotatably connected to the base, the armrests are mounted on the backrest, driving grooves are formed in two sides of the backrest, prism rods are rotatably connected in the driving grooves, and the prism rods are rotatably connected to the base. A moving box is slidably connected into the driving groove and arranged on the prism rod in a sleeving mode. When the seat is adjusted, the armrests are swung towards one side, the back can be leaned backwards at the moment, the angle of the base and the angle of the backrest are changed, and when the backrest rotates, the armrests are driven by the driving assembly and the transmission assembly on the backrest to synchronously turn over, so that the seat is more convenient to adjust. And when the backrest inclines backwards, the armrests can be automatically adjusted by a worker when the worker leans backwards, so that the worker does not need to frequently adjust the relative positions of the armrests when switching between a working state and a rest state, and the worker can use the working seat more comfortably.

Description

Technical Field

[0001] The invention relates to the field of office appliances, in particular to an angle-adjustable office chair with liftable armrests. Background Art

[0002] Office chairs are one of the indispensable furniture in modern office environments. Workers need to sit on office chairs for a long time to work, especially when they sit in the same position for a long time and use fixed chairs to work. The hanging arms will cause a certain amount of pressure on the shoulders and arms, which seriously affects the work efficiency of the workers and makes them feel uncomfortable at work. In order to make office chairs more comfortable, some manufacturers will adjust the height and angle of the armrests. Among them, the patent application with patent publication number CN209018154U provides an adjustable seat armrest structure, which changes the specific position of the armrest by adjusting the armrest height and front and rear displacement to make the workers feel comfortable. Of course, the patent application with patent publication number CN108851706B provides An armrest specially used for an office chair, which is also adjusted by changing the relative position of the armrest to make the armrest comfortable for the staff. However, in actual use, because the staff sits on the office chair for a long time to work, the same sitting posture for a long time will make the waist feel uncomfortable, and the sitting posture needs to be adjusted frequently, so the backrest angle of the office chair needs to be adjusted within a certain range. When the backrest angle changes, the relative position of the staff's arm will change, causing the armrest adjusted to a comfortable position during work to make the staff feel uncomfortable. Therefore, the staff needs to adjust the relative position of the armrest again, and the frequent adjustment of the relative position of the armrest whenever taking a break will make the staff feel inconvenient.

[0003] For this reason, a kind of angle-adjustable office chair with liftable armrests is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide an angle-adjustable office chair with liftable armrests, so as to solve the problem that when workers switch between working state and rest state, they need to frequently adjust the relative position of the armrests, which makes the workers feel inconvenienced.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The movable box is sleeved on the prism rod, and the armrest is rotatably mounted on the movable box. A driving assembly is installed in the driving slot, and the driving assembly is connected to the prism rod. A transmission assembly is installed in the movable box, and the transmission assembly is connected to the armrest. A starting piece is installed on the armrest. When the armrest is swung to make the starting piece operate, and when leaning back, the driving assembly drives the prism rod to rotate, and the rotation of the prism rod drives the armrest to rotate through the transmission assembly in the movable box. A locking piece abutting against the armrest is installed on the movable box. When the armrest is pulled to move outward, the other end of the armrest abuts against the locking piece, so that the movable box moves in the backrest.

[0007] Among them, the driving component will operate when the staff adjusts the backrest angle for work or rest. The staff changes the specific position of the armrest when switching between the two states of work and rest, so that the synchronization of the armrest position and the backrest angle is guaranteed. Of course, by setting the prism rod, the moving box can slide on the prism rod without affecting the operation of the parts in the moving box driven by the prism rod, ensuring that the prism can stably drive the armrest to rotate through the transmission assembly. Because the transmission assembly is provided, the armrest can swing left and right, and the swing of the armrest can control the reclining of the backrest and the opening and closing of the locking part, so as to quickly adjust the position of the backrest, and make the armrest rotate synchronously without interfering with the normal operation of the inverted armrest, so that the armrest can rotate with the swing of the backrest, and there is no need for the user to adjust the relative position of the armrest, thereby improving the comfort of the seat during use.

[0008] Preferably, the driving assembly includes a round rod, a first gear, a transmission box, and a second gear. Round rods are fixedly installed on both sides of the base, the first gear is fixedly installed on the round rod, the backrest is rotatably connected to the round rod, a transmission box is installed in the driving groove, a worm gear structure is installed in the transmission box, a second gear is rotatably installed on one side of the transmission box, the second gear is meshed with the first gear, the worm shaft in the worm gear structure is fixedly installed with the shaft of the second gear, the prismatic rod rotates on the transmission box and extends into the transmission box, and the prismatic rod is fixedly installed with the worm shaft in the worm gear structure.

[0009] Because the first gear is fixedly mounted on the round rod, and the round rod is fixed on the base, the first gear remains fixed relative to the base, and the second gear is meshed with the first gear. Therefore, when the angle of the backrest is adjusted around the round rod, the second gear will rotate, so that the second gear can drive the worm gear structure in the transmission box to operate. Of course, the transmission box can use not only the worm gear structure, but also a similar structure that can change the transmission direction. However, it is required that the transmission structure can only transmit in one direction, so that the rotation of the backrest can drive the armrest to rotate, so as to avoid the handrail from rotating when the staff accidentally presses the handrail. The connecting structure drives the backrest to rotate quickly to prevent accidents during use by staff. Because the worm gear is connected to the prismatic rod and the second gear respectively, the rotation of the second gear will drive the prismatic rod to rotate at the same time. Through the round rod, two gears and the transmission structure in the transmission box, the armrest can rotate at the same time as the flipping of the backrest, ensuring the synchronization of the armrest when flipping, so that the armrest can rotate synchronously when the user leans back, ensuring that the armrest always remains parallel to the ground, and the user does not need to adjust the specific position of the armrest when leaning back to rest, which greatly improves the convenience of using the office chair.

[0010] Preferably, a rotating cylinder is provided on one side of the second gear, and the rotating cylinder is fixedly mounted on the inner wall of the driving groove. A plurality of blocks arranged in a ring are provided on the inner wall of the rotating cylinder. A rotating rod is fixedly mounted on one side of the second gear, and the rotating rod extends into the rotating cylinder. A groove is provided on the side wall of the rotating rod, and a card is slidably connected in the groove, and the card abuts against the block when extended.

[0011] It should be noted that when the staff use the chair, some staff will lean back slowly to adjust the angle between the seat and the backrest, while some staff will lean back quickly to achieve the effect of quickly adjusting the angle between the seat and the backrest. However, leaning back quickly will cause the backrest to have a certain impact force backwards. However, once the impact force is too large, the seat will fall backwards. At the same time, because the angle adjustment of the backrest is synchronized with the angle adjustment of the armrest, when the backrest falls backwards, the armrest will flip downward. Once the staff's arm is accidentally placed in the gap between the armrest and the backrest, the rapidly swinging armrest will clamp the arm. Both of the above situations will cause safety hazards, so the staff is required to control the backrest to adjust slowly. Specifically, because the rotating rod and the second gear The card slides at the eccentric part of the rotating rod, and once the second gear rotates too fast, that is, when the backrest swings too fast, the card will pop out due to the centrifugal force, and a plurality of blocks are fixedly installed on the inner wall of the rotating cylinder, so that the card will abut against the blocks when it pops out, so that the second gear will be stuck and cannot rotate, so that as long as the backrest angle is flipped too fast, the second gear will be stuck, so that the backrest stops flipping, ensuring the safety of the staff. By adding the rotating cylinder, the blocks, the rotating rod and the card to the existing structure and using them in conjunction with the two gears in the present invention, the safety of the backrest when it is tilted back is guaranteed, avoiding the need to install a damping rod for use, and reducing the overall cost of the equipment.

[0012] Preferably, when the backrest is perpendicular to the ground, the angle between the card and the nearest block is 60°, the cross section of the block is triangular, and the side edge close to the central axis of the rotating cylinder is arc-shaped.

[0013] Of course, when the staff leans back quickly on the backrest, if the armrest accidentally gets their hands stuck before they lean back to a certain angle, they will stop leaning back immediately. However, once the staff leans back more than a certain angle, it is difficult to stop leaning back due to inertia and their own gravity, which may lead to accidents. Therefore, by setting the angle between the card and the nearest card block to 60°, the staff can lean back quickly before leaning back 60°, and need to lean back slowly afterwards. Of course, the cross-section of the card block is triangular, and the side edge close to the central axis of the rotating cylinder is an arc-shaped structure, so that the backrest can quickly return to its original position, because the reverse rotation generates centrifugal force to push the card out. At this time, the card can only slide on the arc surface on one side of the card block and cannot be connected with the card block. Therefore, the backrest can quickly return to its original position, which improves the convenience of using the office chair.

[0014] Preferably, the transmission assembly includes a short rod, a ring, and a rotating column. Two mutually meshing bevel gears are installed in the movable box, one of the bevel gears is slidably connected to the prismatic rod, and a short rod is fixedly installed on the rotating shaft of the other bevel gear. A ring is fixedly installed on the armrest, and the short rod extends into the ring. A rotating column rotatably connected to the inner wall of the ring is fixedly installed on the side wall of the short rod, and a torsion spring connected to the ring is installed on the rotating column.

[0015] When in use, because the driving assembly drives the prismatic rod to rotate, and the moving box slides on the prismatic rod, the prismatic rod can drive the bevel gear set mounted thereon to operate. Of course, other transmission parts of the structure can be used as long as the transmission direction can be changed. One of the gears of the bevel gear set is fixedly installed on the short rod, and the short rod is connected to the ring through a rotating column, so the prismatic rod can drive the armrest to rotate through the short rod and the ring. Of course, because the ring is mounted on the short rod and the two are connected to each other through a rotating column, the armrest can swing. Of course, because a torsion spring is installed on the rotating column, a certain pulling force is required to pull the armrest to swing to prevent the armrest from being too loose. At the same time, multi-level control can be performed through the swing of the armrest. When the armrest swings at a small angle, the starting part can be opened and operated, and when the armrest swings at a large angle, the locking part can be pushed to operate, so that the staff can quickly adjust the office chair, which greatly improves the convenience of using the office chair.

[0016] Preferably, the locking member includes a locking column, a compression spring, a rack, and a long clamping tooth. A locking groove is opened on one side of the movable box, and a locking column is slidably connected in the locking groove. When the armrest is pushed to unfold, one end of the locking column abuts against the armrest, and the other end of the locking column abuts against the compression spring abutting against the inner wall of the locking groove. A rack is fixedly installed on one side of the driving groove, and the rack and the prismatic rod are arranged parallel to each other. A long clamping tooth is fixedly installed on the locking column, and the long caliper abuts against the rack.

[0017] The rotation of the prismatic rod can drive the armrest to rotate through the structure in the moving box without hindering the moving box to move on the prismatic rod. Therefore, it is necessary to control the moving box through the locking piece to prevent the moving box from moving when it is not needed. Specifically, because the armrest can swing left and right relative to the backrest, when the armrest is pulled to move to one side, because a point on the armrest maintains a relatively fixed relationship with the backrest, the other end of the armrest can resist the locking column. When the armrest continues to be pulled, it will push the locking column to retract into the locking groove and compress the compression spring abutting therewith, and the moving locking column will drive the long strip clamping tooth to move, so that the long strip clamping tooth abutting against the rack continues to move away, and the moving box can be moved at this time. Of course, the armrest can be released after the adjustment is completed, and the compressed compression spring will drive the long strip clamping tooth to continue to mesh with the rack through the locking column, so that the moving block cannot move, and the height of the armrest can be adjusted by pushing the armrest, which greatly improves the convenience of the staff.

[0018] Preferably, the starting member includes an arc-shaped latch tooth and an annular latch tooth. The movable box is fixedly mounted with an arc-shaped latch tooth, and the arc-shaped latch tooth is arranged on a side away from the locking column. The armrest is fixedly mounted with an annular latch tooth, and the central axis of the annular latch tooth and the central axis of the ring are located on the same axis. The arc-shaped latch tooth abuts against the annular latch tooth to push the armrest to unfold. After the annular latch tooth is separated from the arc-shaped latch tooth, the armrest abuts against the locking column.

[0019] Because the armrest is connected to the moving box only by a short rod, a ring and a moving column, the supporting capacity of the armrest is weak and cannot withstand strong pressure. Therefore, by setting an annular latch and an arc-shaped latch, the armrest is more stressed. Of course, it can also lock the flipping of the backrest. Because the flipping of the backrest is synchronized with the rotation of the armrest, the backrest cannot be flipped as long as the armrest is stuck. Specifically, according to the above, the armrest can be swung. When the armrest is in the original position, the arc-shaped latch at this time abuts against the annular latch, and the backrest cannot lean back. However, when it is necessary to lean back, the armrest is swung to make the annular latch on the armrest away from the arc-shaped latch below, so that the armrest can rotate. Of course, after the annular latch is separated from the arc-shaped latch, the armrest will abut against the locking column, separating the rotation and height change of the armrest from each other. By swinging the armrest, the rotation angle of the armrest and the backrest and the height of the armrest can be changed at the same time, which greatly improves the portability of the office chair.

[0020] Preferably, an iron sheet is fixedly mounted on the backrest, a long groove is opened on one side of the armrest, a magnet for adsorbing the iron sheet is placed in the long groove, and the depth of the long groove is greater than the thickness of the magnet, and a baffle is fixedly mounted on the movable box, and the baffle slides in the driving groove.

[0021] Because the armrest can swing and the angle of the backrest can be changed when the armrest swings, it is necessary to limit the swing of the armrest to prevent the armrest from shaking. The magnetic force generated by the magnet adsorbs the iron sheet so that the armrest will be tightly adsorbed on one side, ensuring that the armrest will not shake during use, and will not make the staff feel inconvenient. At the same time, the staff can easily adjust the armrest. A baffle is fixedly installed on the moving box to prevent foreign matter from entering the driving slot, thereby indirectly ensuring the service life of the office chair.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When the seat needs to be adjusted, swing the armrest to one side, then you can lean back to change the angle between the base and the backrest. While the backrest is rotating, the armrest is driven to flip synchronously through the drive assembly and transmission assembly on the backrest, so that when the backrest tilts backward, the armrest can adjust itself as the worker leans back. When the worker switches between working and resting states, there is no need to frequently adjust the relative position of the armrest, allowing the worker to use the work chair more comfortably.

[0024] 2. When the backrest swings too fast, the card will pop out due to the centrifugal force, causing the card to abut against the card, causing the second gear to get stuck and unable to rotate. As long as the backrest angle is flipped too fast, the second gear will get stuck, allowing the staff to lean back quickly before leaning back 60°, and then need to lean back slowly. Once the speed is too fast, the backrest will stop flipping, ensuring the safety of the staff while making it more convenient and comfortable to use the work chair.

[0025] 3. When the armrest is in the original position, the arc-shaped latch and the annular latch are in contact with each other, and the backrest cannot be tilted back. When it is necessary to tilt back, the armrest is swung to make the annular latch on the armrest away from the arc-shaped latch below, so that the armrest can be rotated. By setting the arc-shaped latch and the annular latch to lock the flip angle of the backrest, the armrest can be further supported, making it more stable, thereby indirectly improving the comfort of the work chair when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the side structure of the backrest in the present invention;

[0028] Figure 3 It is a schematic diagram of the internal three-dimensional structure of the driving slot in the present invention;

[0029] Figure 4 It is a schematic diagram of the internal structure of the driving slot in the present invention;

[0030] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 6 It is a schematic diagram of the side structure of the driving slot in the present invention;

[0032] Figure 7 It is a side structural schematic diagram of the handrail in the present invention;

[0033] Figure 8 It is a schematic diagram of the structure of the mobile box in the present invention.

[0034] In the figure: 1, base; 2, backrest; 3, armrest; 4, driving groove; 5, baffle; 6, iron sheet; 7, moving box; 8, round rod; 9, first gear; 10, second gear; 11, transmission box; 12, prismatic rod; 13, rack; 14, rotating cylinder; 15, block; 16, rotating rod; 17, card; 18, locking groove; 19, locking column; 20, long tooth; 21, compression spring; 22, short rod; 23, collar; 24, rotating column; 25, annular tooth; 26, torsion spring; 27, magnet; 28, arc tooth. DETAILED DESCRIPTION

[0035] See also Figures 1 to 8 The present invention provides an angle-adjustable office chair with liftable armrests, and the technical solution is as follows:

[0036] The invention discloses an angle-adjustable office chair with liftable armrests, comprising a base 1 and a backrest 2, wherein the backrest 2 is rotatably connected to the base 1, and an armrest 3 is mounted on the backrest 2. Driving grooves 4 are provided on both sides of the backrest 2, and a prism rod 12 is rotatably connected in the driving groove 4. A moving box 7 is slidably connected in the driving groove 4, and the moving box 7 is sleeved on the prism rod 12. The armrest 3 is rotatably mounted on the moving box 7.

[0037] Round rods 8 are fixedly installed on both sides of the base 1, and a first gear 9 is fixedly installed on the round rods 8. The backrest 2 is rotatably connected to the round rods 8. A transmission box 11 is fixedly installed on the backrest 2, and a worm gear structure is installed in the transmission box 11. A second gear 10 is rotatably installed on one side of the transmission box 11, and the second gear 10 is meshed with the first gear 9. The worm and worm wheel in the worm gear structure are fixedly installed with the second gear 10 and the prismatic rod 12 respectively.

[0038] A rotating cylinder 14 is fixedly installed on the inner wall of the driving groove 4, and a plurality of annular blocks 15 are provided on the inner wall of the rotating cylinder 14. A rotating rod 16 extending into the rotating cylinder 14 is fixedly installed on one side of the second gear 10, and a groove is provided on the side wall of the rotating rod 16. A card 17 is slidably connected in the groove, and the card 17 abuts against the block 15 when it is extended.

[0039] When the backrest 2 is in the original position, the angle between the card 17 and the nearest block 15 is 60°. The cross section of the block 15 is triangular, and the side edge close to the central axis of the rotating cylinder 14 is arc-shaped.

[0040] Two mutually meshing bevel gears are installed in the moving box 7, one of which is slidably connected to the prismatic rod 12, and a short rod 22 is fixedly installed on the rotating shaft of the other bevel gear. A ring 23 is fixedly installed on the handrail 3. The short rod 22 extends into the ring 23 and is fixedly installed with a rotating column 24 rotatably connected to the inner wall of the ring 23, and a torsion spring 26 is installed on the rotating column 24.

[0041] A locking groove 18 is provided on one side of the moving box 7, and a locking column 19 is slidably connected in the locking groove 18. When the armrest 3 is pushed to unfold, one end of the locking column 19 abuts against the armrest 3, and a compression spring 21 abuts between the other end of the locking column 19 and the inner wall of the locking groove 18. A rack 13 parallel to the prism rod 12 is fixedly installed on one side of the driving groove 4, and a long strip of teeth 20 abutting against the rack 13 is fixedly installed on the locking column 19.

[0042] An arc-shaped latch tooth 28 is fixedly installed on the movable box 7, and the arc-shaped latch tooth 28 is arranged on the side away from the locking column 19. An annular latch tooth 25 is fixedly installed on the armrest 3, and the central axis of the annular latch tooth 25 and the central axis of the collar 23 are located on the same axis. The arc-shaped latch tooth 28 abuts against the annular latch tooth 25 to push the armrest 3 to unfold. After the annular latch tooth 25 is separated from the arc-shaped latch tooth 28, the armrest 3 abuts against the locking column 19.

[0043] An iron sheet 6 is fixedly installed on the backrest 2, and a long groove is opened on one side of the armrest 3. A magnet 27 for adsorbing the iron sheet 6 is placed in the long groove, and the depth of the long groove is greater than the thickness of the magnet 27. A baffle 5 is fixedly installed on the moving box 7, and the baffle 5 slides in the driving groove 4.

[0044] See also Figure 1 , Figure 7 and Figure 8 When the staff is ready to adjust the angle of the backrest 2, they hold the armrest 3 and swing the armrest 3 toward the outside of the seat. Because the torsion spring 26 is installed, the swung armrest 3 returns to the torsion spring 26 for twisting. The swing armrest 3 makes the annular latch 25 on the armrest 3 away from the arc-shaped latch 28 below. At this time, you can lean back. Of course, the armrest 3 will not abut against the locking column 19 until the annular latch 25 is separated from the arc-shaped latch 28. At this time, if there is no need to adjust the height of the armrest 3, you can stop swinging the armrest 3.

[0045] See also Figure 3 and Figure 4In the process of the backrest 2 rotating backward, because the first gear 9 is fixedly mounted on the round rod 8, and the round rod 8 is fixed on the base 1, the first gear 9 remains fixed relative to the base 1, and the second gear 10 is engaged with the first gear 9. Therefore, when the angle of the backrest 2 is adjusted around the round rod 8, the second gear 10 will rotate, so that the second gear 10 can drive the worm gear structure in the transmission box 11 to operate. Because the worm gear is connected to the prismatic rod 12, the prismatic rod 12 can rotate.

[0046] See also Figure 2 , Figure 3 and Figure 7 , the moving box 7 slides on the prismatic rod 12, so that the rotating prismatic rod 12 can drive the bevel gear set mounted thereon to operate, and one of the gears of the bevel gear set is fixedly installed with the short rod 22, and the short rod 22 is connected with the collar 23 through the rotating column 24, so the prismatic rod 12 can drive the armrest 3 to rotate through the short rod 22 and the collar 23, so that when the backrest 2 leans back, the armrest 3 can change its position more as the backrest 2 is turned over, so that the armrest 3 adapts to the position where the arm is placed, and the twisted torsion spring 26 will push the armrest 3 back to its original position. At this time, the arc-shaped latch tooth 28 abuts against the annular latch tooth 25, and the backrest 2 cannot lean back.

[0047] See also Figure 2 and Figure 7 Of course, the magnetic force generated by the magnet 27 adsorbs the iron sheet 6, so that the armrest 3 will be tightly adsorbed on one side, ensuring that the armrest 3 will not shake when in use. While preventing the armrest from shaking during use and affecting work, the staff can also easily and quickly pull the armrest 3 for adjustment.

[0048] See also Figure 3 , Figure 4 and Figure 5It should be noted that when the staff member leans back quickly on the backrest 2, before leaning back to a certain angle, because the upper body of the human body has not yet completely leaned back to a lying position, the upper body of the human body will stop leaning back when the waist of the human body exerts force. Therefore, when the hand is accidentally stuck on the armrest 3, as long as the user stops leaning back, the armrest 3 will stop rotating immediately. However, once the staff member leans back to more than a certain angle, inertia and the effect of gravity will cause the center of gravity to shift, making it difficult for the waist to exert force to stop the upper body from leaning back, resulting in an accident. Therefore, by The angle of 15 is set to 60°, so that when the second gear 10 rotates quickly at the beginning and the card 17 is thrown out, the card 17 does not contact the block 15, which also causes the block 15 to be unable to clamp the card 17 and prevent it from rotating. Therefore, the staff can lean back quickly before leaning back 60°, and then need to lean back slowly. Once the speed is too fast, the card 17 at the eccentric part of the rotating rod 16 will pop out and abut against the block 15, so that the second gear 10 is stuck and cannot rotate. As long as the angle of the backrest 2 is flipped too quickly, the second gear 10 will get stuck, stopping the flipping of the backrest 2, thereby ensuring the safety of the staff.

[0049] See also Figure 3 , Figure 6 and Figure 8 When the armrest 3 is in use, the armrest 3 is moved to both sides. Because a point on the armrest 3 maintains a relatively fixed relationship with the backrest 2, the other end of the armrest 3 can resist the locking column 19. When the armrest 3 is pulled continuously, the locking column 19 will be pushed to retract into the locking groove 18 and compress the compression spring 21 abutting against it. The moving locking column 19 will drive the long strip tooth 20 to move, so that the long strip tooth 20 abutting against the rack 13 will continue to move away. Of course, after the height is adjusted to the right position, the armrest 3 is released, and the twisted torsion spring 26 will push the armrest 3 back to its original position. At the same time, the compressed compression spring 21 will push the locking column 19 back to its original position. The movement of the locking column 19 will simultaneously drive the long strip tooth 20 fixed thereon to move, so that it continues to maintain abutment with the rack 13.

[0050] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. An angle-adjustable office chair with liftable armrests, comprising a base (1) and a backrest (2), wherein the backrest (2) is rotatably connected to the base (1), and an armrest (3) is mounted on the backrest (2), characterized in that: A driving groove (4) is provided on both sides of the backrest (2), a prism rod (12) is rotatably connected in the driving groove (4), a moving box (7) is slidably connected in the driving groove (4), the moving box (7) is sleeved on the prism rod (12), the armrest (3) is rotatably mounted on the moving box (7), a driving assembly is installed in the driving groove (4), the driving assembly is connected to the prism rod (12), a transmission assembly is installed in the moving box (7), the transmission assembly is connected to the armrest (3), Then, a starting member is installed on the armrest (3), and the armrest (3) is swung to activate the starting member. When leaning back, the driving assembly drives the prism rod (12) to rotate, and the rotation of the prism rod (12) drives the armrest (3) to rotate through the transmission assembly in the moving box (7). The moving box (7) is equipped with a locking member that abuts against the armrest (3). When the armrest (3) is pulled to move outward, the other end of the armrest (3) abuts against the locking member, so that the moving box (7) moves inside the backrest (2).

2. The angle-adjustable office chair with liftable armrests according to claim 1, characterized in that The driving assembly comprises a round rod (8), a first gear (9), a transmission box (11), and a second gear (10). The round rods (8) are fixedly mounted on both sides of the base (1). The first gear (9) is fixedly mounted on the round rods (8). The backrest (2) is rotatably connected to the round rods (8). The transmission box (11) is mounted in the driving groove (4). A worm gear structure is mounted in the transmission box (11). A second gear (10) is rotatably mounted on one side of the transmission box (11). The second gear (10) is meshed with the first gear (9). The worm shaft in the worm gear structure is fixedly mounted on the shaft of the second gear (10). The prismatic rod (12) is rotatably mounted on the transmission box (11) and extends into the transmission box (11). The prismatic rod (12) is fixedly mounted on the worm gear shaft in the worm gear structure.

3. The angle-adjustable office chair with liftable armrests according to claim 2, characterized in that The transmission assembly comprises a short rod (22), a collar (23), a torsion spring (26), and a rotating column (24). Two mutually meshing bevel gears are installed in the moving box (7), one of the bevel gears is slidably connected to the prismatic rod (12), and the short rod (22) is fixedly installed on the rotating shaft of the other bevel gear. The collar (23) is fixedly installed on the handrail (3), and the short rod (22) extends into the collar (23). The side wall of the short rod (22) is fixedly installed with a rotating column (24) that is rotatably connected to the inner wall of the collar (23), and the rotating column (24) is installed with a torsion spring (26) connected to the collar (23).

4. The angle-adjustable office chair with liftable armrests according to claim 3, characterized in that The starting member comprises an arc-shaped latch tooth (28) and an annular latch tooth (25). The movable box (7) is fixedly mounted with the arc-shaped latch tooth (28), and the arc-shaped latch tooth (28) is arranged on a side away from the locking column (19). The handrail (3) is fixedly mounted with an annular latch tooth (25), and the central axis of the annular latch tooth (25) and the central axis of the collar (23) are located on the same axis. The arc-shaped latch tooth (28) abuts against the annular latch tooth (25) to push the handrail (3) to unfold. After the annular latch tooth (25) is separated from the arc-shaped latch tooth (28), the handrail (3) abuts against the locking column (19).

5. The angle-adjustable office chair with liftable armrests according to claim 4, characterized in that The locking member comprises a locking column (19), a compression spring (21), a rack (13), and a long clamping tooth (20). A locking groove (18) is provided on one side of the movable box (7). A locking column (19) is slidably connected in the locking groove (18). When the armrest (3) is pushed to unfold, one end of the locking column (19) abuts against the armrest (3), and the other end of the locking column (19) abuts against the compression spring (21) abutting against the inner wall of the locking groove (18). A rack (13) is fixedly installed on one side of the driving groove (4). The rack (13) and the prism rod (12) are arranged parallel to each other. A long clamping tooth (20) is fixedly installed on the locking column (19), and the long caliper abuts against the rack (13).

6. The angle-adjustable office chair with liftable armrests according to claim 5, characterized in that A rotating cylinder (14) is provided on one side of the second gear (10), and the rotating cylinder (14) is fixedly mounted on the inner wall of the driving groove (4). A plurality of annularly arranged blocks (15) are provided on the inner wall of the rotating cylinder (14). A rotating rod (16) is fixedly mounted on one side of the second gear (10), and the rotating rod (16) extends into the rotating cylinder (14). A groove is provided on the side wall of the rotating rod (16), and a card (17) is slidably connected in the groove. When the card (17) is extended, it abuts against the block (15).

7. The angle-adjustable office chair with liftable armrests according to claim 6, characterized in that When the backrest (2) is perpendicular to the ground, the angle between the card (17) and the nearest block (15) is 60°, the cross section of the block (15) is triangular, and the side edge line close to the central axis of the rotating cylinder (14) is arc-shaped.

8. The angle-adjustable office chair with liftable armrests according to claim 1, characterized in that An iron sheet (6) is fixedly mounted on the backrest (2), a long groove is provided on one side of the armrest (3), a magnet (27) for adsorbing the iron sheet (6) is placed in the long groove, and the depth of the long groove is greater than the thickness of the magnet (27), and a baffle (5) is fixedly mounted on the movable box (7), and the baffle (5) slides in the driving groove (4).

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