Height adjustment device

Abstract

Height adjustment device (1) which is attached to the side of a piece of furniture or office furniture and which has: a mounting seat (10) comprising a locking groove section (11), a rail groove section (12) and a mounting section (13), wherein the locking groove section (11) is provided with a plurality of vertically arranged, spaced-apart and communicating locking grooves (111), and wherein the mounting section (13) is mounted in a mounting position (A) on one side of the furniture or office furniture; and an outer sleeve (20) which is connected to the outside of the mounting seat (10) in a rail-like manner and which can move up and down along the rail groove section (12), wherein the outer sleeve (20) has a support seat (21) and an actuating window (22), and wherein the support seat (21) is arranged at the upper end of the outer sleeve (20), and wherein the actuating window (22) is located on one side of the outer sleeve (20) and communicates with the interior of the outer sleeve (20); wherein the outer sleeve (20) further comprises a sliding seat (23), the sliding seat (23) being located in the outer sleeve (20); and wherein the height adjustment device further comprises a pull unit (30) which is arranged to be slidably up and down in the sliding seat (23) of the outer sleeve (20), wherein the pull unit (30) has an actuating section (31), a receiving groove (32) and a locking projection (34), and wherein the actuating section (31) extends from the upper end of the pull unit (30) and projects out of the actuating window (22) of the outer sleeve (20), and wherein the actuating section (31) serves to ensure convenient actuation for the user, and wherein a spring element (35) is arranged in the receiving groove (32), and wherein the locking projection (34) can engage in one of the detent grooves (111) of the detent groove section (11) of the mounting seat (10) under the influence of the clamping force of the spring element (35) on the pull unit (30), thereby locking the support seat (21) of the outer sleeve (20) in a is positioned at the corresponding height position of the locking groove (111); wherein the locking projection (34) of the pull unit (30) is moved synchronously when the actuating section (31) is actuated, such that the locking projection (34) is separated from the detent groove (111) of the detent groove section (11) of the mounting seat (10) into an unlocked state, and wherein the mounting seat (10) remains stationary, allowing the outer sleeve (20) and the pull unit (30) to move upwards and downwards with respect to the mounting seat (10); wherein, after the position has been set by moving the outer sleeve (20) and the pull unit (30) up and down, the actuating section (31) can be released, the locking projection (34) engaging in a further detent groove (111) of the detent groove section (11) of the mounting seat (10) in a locked state under the influence of the restoring force of the spring element (35); and wherein, when the outer sleeve (20) is moved up and down relative to the mounting seat (10) for height adjustment, the up and down movement of the outer sleeve (20) occurs between a highest point (H) and a lowest point (L), wherein the mounting seat (10) or the mounting position (A) is located between the highest point (H) and the lowest point (L) of the movement of the outer sleeve (20); characterized by that the cover unit (24) is provided on one side of the outer sleeve (20) for covering the train unit (30), wherein the cover unit (24) consists of a first cover plate (241) and a second cover plate (242) which are joined together to form a single unit, and wherein the first cover plate (241) is mounted on the train unit (30) and is provided with a downwardly opening first long recess (2411), and wherein the second cover plate (242) is mounted on the first cover plate (241) and is provided with a downwardly opening second long recess (2421), and wherein the first long recess (2411) and the second long recess (2421) are aligned sequentially, the cover plates (241, 242) engaging in the rail groove section (12) through the long recesses (2411, 2421) to create an up-and-down To enable movement.

Description

[0001] The invention relates to a height adjustment device, in particular a height adjustment device that can be used in conjunction with furniture or office furniture such as the armrests of a chair and can create a suitable shielding effect to achieve a unique appearance and an appealing exterior of furniture.

[0002] Document DE 20 2015 102 377 U1 and document US 2011 / 0248542 A1 each describe the construction of an armrest for a chair, wherein a height adjustment device with the features of the preamble of claim 1 is known from these documents.

[0003] JP 2011-005153 A also reveals a height-adjustable armrest arrangement.

[0004] Publication DE 203 19 458 U1 shows an office chair with armrests which are equipped with built-in control buttons for adjusting the movement of the seat and backrest in order to adjust the tilt of the seat and backrest as well as the seat height.

[0005] Publication DE 94 05 085 U1 concerns an office chair with a height-adjustable seat, a tilt-adjustable backrest and two armrests.

[0006] Document US 6 557 939 B1 also refers to an office chair with a height-adjustable seat, a tiltable backrest, and two armrests.

[0007] Publication CA 2 364 360 A1 discloses an office chair with a seat, a backrest and two armrests, wherein the backrest and armrests are height-adjustable relative to the seat.

[0008] Furthermore, document EP 1 868 466 B1 describes armrests for an office chair which have a height-adjustable armrest column.

[0009] Fig. Figure 25 shows a conventional height adjustment device 1a that can be used in conjunction with furniture or office furniture (such as the armrests of a chair). The height adjustment device 1a essentially consists of a sliding seat 10a, an outer sleeve 20a, and a mounting section 30a. The sliding seat 10a is attached to the mounting section 30a. The outer sleeve 20a is slidably mounted on the sliding seat 10a. The mounting section 30a is attached to a left or right side of a seat 4b of a chair 4 or of furniture or office furniture. When adjusting the height of the outer sleeve 20a or the chair armrest 2, the sliding seat 10a and the mounting section 30a remain stationary, with the outer sleeve 20a moving up and down relative to the sliding seat 10a and the mounting section 30a in such a way that the chair armrest 2 or a table top 3 mounted on the outer sleeve 20a moves along with it.

[0010] Viewed from the left and right sides of the chair 4 (i.e., the furniture or office furniture), the height adjustment device 1a is clearly designed as a two-part device (an outer sleeve 20a and a mounting section 30a). Furthermore, the mounting section 30a faces outwards and is visible, which detracts from the unique appearance and appealing exterior of the furniture (such as the chair 4). It may even influence consumer purchasing decisions.

[0011] Such a conventional height adjustment device 1a, as used in Fig. Figure 25 is known, for example, from document TW M431639 U1, in which the sliding seat and the mounting section together form a type of mounting seat. Furthermore, the sliding seat has a locking groove section and lateral rail grooves, with a decorative element mounted in the rail grooves in the lower part of the sliding seat.

[0012] The invention is based on the objective of creating a height adjustment device that avoids the aforementioned disadvantages through simple measures.

[0013] This problem is solved according to the invention by a height adjustment device having the features specified in claim 1. Further advantageous embodiments of the invention will become apparent from the features of the dependent claims.

[0014] The invention provides a height adjustment device that is attached to the side of a piece of furniture or office furniture. When the actuating section is activated, the locking projection of the pull unit moves synchronously, allowing the outer sleeve to move up and down relative to the mounting seat. As the outer sleeve is moved up and down relative to the mounting seat for height adjustment, the movement of the outer sleeve 20 occurs between a highest and a lowest point, with the mounting seat or attachment position located between the highest and lowest points of the outer sleeve's movement. In this way, the outer sleeve can create a suitable shielding effect on the mounting seat, ensuring a unique and attractive appearance for the furniture.

[0015] According to the invention, a height adjustment device is provided which is attached to the side of a piece of furniture or office furniture and comprises the following: a mounting seat comprising a locking groove section, a rail groove section and a mounting section, wherein the locking groove section is provided with a plurality of vertically arranged, spaced apart and communicating locking grooves, and wherein the mounting section is attached in a mounting position to one side of the furniture or office furniture; an outer sleeve which is connected to the outside of the mounting seat in a rail-like manner and which can move up and down along the rail groove section, wherein the outer sleeve has a support seat, an actuating window and a sliding seat, and wherein the support seat is arranged at the upper end of the outer sleeve, and wherein the actuating window is located on one side of the outer sleeve and communicates with the interior of the outer sleeve, and wherein the sliding seat is located in the outer sleeve; and A pull unit which is arranged to be displaceable up and down in the sliding seat of the outer sleeve, wherein the pull unit has an actuating section, a receiving groove and a locking projection, and wherein the actuating section extends from the upper end of the pull unit and projects out of the actuating window of the outer sleeve, and wherein the actuating section serves to ensure convenient actuation for the user, and wherein a spring element is arranged in the receiving groove, and wherein the locking projection can engage in one of the detent grooves of the detent groove section of the mounting seat under the influence of the clamping force of the spring element on the pull unit, thereby positioning the support seat of the outer sleeve in a height position corresponding to the detent groove.

[0016] When the actuating section is pressed, the locking projection of the pull unit is moved synchronously such that the locking projection is separated from the detent groove of the detent groove section of the mounting seat and moved into an unlocked state. The mounting seat remains stationary, allowing the outer sleeve and the pull unit to move up and down relative to the mounting seat. After the position has been adjusted by moving the outer sleeve and the pull unit up and down, the actuating section can be released. The locking projection then engages in a further detent groove of the detent groove section of the mounting seat under the influence of the restoring force of the spring element, thus locking it into a locked state.When the outer sleeve is moved up and down relative to the mounting seat for height adjustment, the up and down movement of the outer sleeve 20 occurs between a highest and a lowest point, with the mounting seat or mounting position located between the highest and lowest points of the outer sleeve's movement. In this way, the outer sleeve can create a suitable shielding effect on the mounting seat to achieve a unique appearance and an appealing exterior for furniture.

[0017] According to the invention, the pulling unit is preferably formed with an inclined guide groove on opposite sides of its lower end and is inclined downwards towards the outside. A sliding wing projects from each of the left and right sides of the locking projection, wherein the two sliding wings are positionally limited in the two inclined guide grooves of the pulling unit and can move simultaneously along the inclined guide grooves such that the up and down movement of the pulling unit can be converted into a lateral displacement of the locking projection.

[0018] According to the invention, the pulling unit preferably further comprises a cover strip located between the sliding seat and the locking groove section, wherein the cover strip has a guide hole into which the locking projection engages, and wherein, when the up and down movement of the pulling unit is converted into a transverse displacement of the locking projection, the locking projection can be limited in the guide hole so that it can be displaced in the guide hole in a transverse direction.

[0019] According to the invention, it can be provided that the spring element is designed as a spring, wherein the sliding seat is provided with an upper spring mounting section, and wherein a lower spring mounting section is arranged in the receiving groove, which is opposite the upper spring mounting section, and wherein the spring element is located between the upper spring mounting section and the lower spring mounting section.

[0020] According to the invention, the cover unit is provided on one side of the outer sleeve for covering the train unit, wherein the cover unit consists of a first cover plate and a second cover plate which are joined together to form a single assembly, and wherein the first cover plate is mounted on the train unit and is provided with a downwardly open, first long recess, and wherein the second cover plate is mounted on the first cover plate and is provided with a downwardly open, second long recess, and wherein the first long recess and the second long recess are aligned one after the other, wherein the cover plates engage in the rail groove section through the long recesses to allow up and down movement.

[0021] According to the invention, it can further be provided that the actuating section is arranged at the upper end of the pulling unit, wherein a sliding space is formed inside the upper section of the outer sleeve, and wherein the sliding space adjoins the actuating window, and wherein the actuating section enters the sliding space when the locking projection arranged on the pulling unit is moved synchronously when the actuating section is actuated for height adjustment.

[0022] According to the invention, the mounting seat is preferably provided on its outer edge with a plurality of stabilizing elements which lie between the mounting seat and the sliding seat.

[0023] According to the invention, the actuating section is preferably arranged on the pulling unit in a way that allows it to be detachably removed from the pull rod.

[0024] According to the invention, it can also be provided that the fastening section of the fastening seat is designed as a long and narrow projection, wherein the furniture or office furniture is a chair having a backrest and a seat, wherein the height adjustment device is attached at an angle to the side of the backrest of the chair by means of the fastening section.

[0025] According to the invention, the support seat preferably serves as the outer sleeve for connection to a chair armrest or a tabletop.

[0026] The invention and its embodiments are explained in more detail below with reference to the drawing. The drawing shows: Fig. 1 a perspective assembly view of an embodiment of a height adjustment device according to the invention; Fig. 2 a side view of the embodiment of a height adjustment device according to the invention in Fig. 1; Fig. 3 a perspective view of the embodiment of a height adjustment device according to the invention, which is attached to a chair and connected to a chair armrest and a table top; Fig. 4 a side view of an embodiment of a height adjustment device according to the invention, which is attached to a chair; Fig. 5 a side view of an embodiment of a height adjustment device according to the invention in Fig. 4, wherein the outer sleeve is shifted upwards; Fig. 6 a perspective exploded view of the embodiment of a height adjustment device according to the invention; Fig. 7 a perspective exploded view of the embodiment of a height adjustment device according to the invention seen from another side; Fig. 8 a perspective view of a train unit according to the invention; Fig. 9 a perspective exploded view of the pulling unit according to the invention before assembly on the outer sleeve; Fig. 10 a perspective assembly view of the Fig. 9; Fig. 11 a side section of the Fig. 10; Fig. 12 a perspective view of a cover strip according to the invention before assembly in the train unit; Fig. 13 a perspective view of a cover strip according to the invention after assembly in the train unit; Fig. 14 a perspective exploded view of a mounting seat according to the invention before connection with cover plates; Fig. 15 a perspective view of the mounting seat and the cover plates before connection with the outer sleeve according to the embodiment of the height adjustment device according to the invention; Fig. 16 a perspective view of the mounting seat and the cover plates after connection with the outer sleeve according to the embodiment of the height adjustment device according to the invention; Fig. 17 a schematic representation of the height adjustment device according to the invention, which is inclined at an angle; Fig. 18 a longitudinal section of the Fig. 17; Fig. 19 a partial view of the Fig. 10; Fig. 20 a schematic representation of the Fig. 17, whereby the outer sleeve is moved upwards; Fig. 21 a longitudinal section of the Fig. 20; Fig. 22 a schematic representation of the Fig. 19, wherein the train unit is powered; Fig. 23 a schematic representation of the height adjustment device according to the invention, wherein the outer sleeve moves to the lowest point; Fig. 24 a schematic representation of the height adjustment device according to the invention, wherein the outer sleeve moves to the highest point; and Fig. 25 a perspective view of a chair with a conventional height adjustment device.

[0027] A height adjustment device according to the invention is mounted on furniture or office furniture such as chairs. Therefore, the "left" and "right" directions mentioned in the following description refer to the direction of the person sitting on the chair. As in the Fig. 3 to Fig. Figure 5 shows that the furniture or office furniture in question is a chair 4 used in an office, but is not limited to that. The chair 4 has a backrest 4a and a seat 4b.

[0028] The height adjustment device 1 is attached to the side of the backrest 4a of the chair 4 [see Fig. 3 to Fig. 5]. When the user is seated on seat 4b of chair 4, the height adjustment device 1 can be easily operated on the left and right sides to adjust the height. The height adjustment device 1 has a mounting seat 10, an outer sleeve 20, and a pull unit 30.

[0029] As in Fig. 6 and Fig. As shown in Figure 7, the mounting seat 10 has a locking groove section 11, a rail groove section 12, and a mounting section 13. The locking groove section 11 is provided with a plurality of vertically arranged, spaced-apart, and interconnected locking grooves 111 [see Figure 7]. Fig. 14 and Fig. 16]. In the illustrated embodiment, the fastening section 13 is designed as a long and narrow locking section, but is not limited to this, and is arranged in a Fig. 4 and Fig. The fastening position 13 shown in Figure 5 is attached to one side of the backrest 4a of the chair 4. In this embodiment, the fastening section 13 is completely embedded in and concealed within the fastening position A, without being exposed, but not confined thereto.

[0030] The height adjustment device 1 is further connected at an angle to the side of the backrest 4a of the chair 4 through the fastening section 13 [see Fig. 3 to Fig. 5], to match the curved shape of the backrest 4a and to achieve a unique appearance and an appealing exterior for the chair 4.

[0031] The outer sleeve 20 is connected to the outside of the mounting seat 10 in a rail-like manner and can move up and down along the rail groove section 12, as in the direction of arrow A in Fig. 1 and in the direction of arrow B in Fig. 2 shown. The outer sleeve 20 has a support seat 21, an actuation window 22, a sliding seat 23, a cover unit 24 and a sliding chamber 25 [see Fig. 6 and Fig. 7], but not limited thereto. The support seat 21 is located at the upper end of the outer sleeve 20 and is connected to a chair armrest 2 or a tabletop 3 [see Fig. 1 to Fig. 3], but not limited thereto. The actuation window 22 is located on one side of the outer sleeve 20 and communicates with the interior of the outer sleeve 20 [see Fig. 6, Fig. 7, Fig. 9 to Fig. 11]. The sliding seat 23 is located in the outer sleeve 20 and is provided with an upper spring fastening section 231 [see Fig. 9 to Fig. 11], but not limited thereto. The cover unit 24 is provided on one side of the outer sleeve 20 for covering the pull unit 30 [see Fig. 6, Fig. 7 and Fig. 15], but not limited thereto. The sliding chamber 25 is located within the top of the outer sleeve 20 and is arranged next to the actuating window 22 [see Fig. 9 to Fig. 11], but not limited to that.

[0032] The cover unit 24 consists of a first cover plate 241 and a second cover plate 242, which are joined to form a single assembly, but are not limited to this assembly. The first cover plate 241 is screwed to the sliding seat 23 and mounted on the pull unit 30 in such a way that the associated structure of the pull unit 30 is not exposed. The first cover plate 241 has a downward-facing, first long recess 2411. The second cover plate 242 is hooked onto the first cover plate 241 to cover the screws on the first cover plate 241 and the associated structure of the sliding seat 23, and to achieve a unique and attractive appearance for the furniture. The second cover plate 242 has a downward-facing, second long recess 2421.The first long recess 2411 and the second long recess 2421 are aligned one after the other, with the cover plates 241, 242 engaging in the rail groove section 12 through the long recesses 2411, 2421 [see . Fig. 6, Fig. 7, Fig. 14 to Fig. 16] to enable an up-and-down movement.

[0033] The mounting seat 10 is provided on its outer edge with a plurality of stabilizing elements 14 which lie between the mounting seat 10 and the sliding seat 23 [see Fig. 6, Fig. 7 and Fig. 15], but not limited thereto. The stabilizing elements 14 are used to maintain the stability of the outer sleeve 20 during sliding up and down and to provide approximately a damping effect.

[0034] The pulling unit 30 is arranged to be slidable up and down in the sliding seat 23 of the outer sleeve 20 [see Fig. 10 to Fig. 13]. The pull unit 30 has an actuating section 31, a receiving groove 32, a cover strip 33, a locking projection 34, a spring element 35 and an inclined guide groove 36 [see Fig. 6 to Fig. 8], but not limited thereto. The actuating section 31 extends from the upper end of the pull unit 30 and projects out of the actuating window 22 of the outer sleeve 20 [see Fig. 10, Fig. 11, Fig. 19 and Fig. 22]. The actuating section 31 serves to ensure practical operation for the user. The actuating section 31 is detachably connected to the pull unit 30, as shown in Fig. Figure 9 shows how to facilitate assembly and accelerate manufacturing. A lower spring mounting section 321 is arranged in the receiving groove 32, opposite the upper spring mounting section 231 [see Figure 9]. Fig. 6, Fig. 9 and Fig. 11], but not limited thereto. The cover strip 33 covers the receiving groove 32, with the cover strip 33 being located between the sliding seat 23 and the locking groove section 11 [see Fig. 18 and Fig. 21], but not limited thereto. A sliding wing 341 projects from each of the left and right sides of the locking projection 34 [see Fig. 6, Fig. 7 and Fig. 9], but not limited thereto. The spring element 35 is a spring, but not limited thereto. The inclined guide grooves 36 are formed opposite each other at the lower end of the tension unit 30 and are inclined downwards towards the outside [see Fig. 7, Fig. 8 and Fig. 17]. Under the influence of the clamping force of the spring element 35 on the pull unit 30, the locking projection 34 can engage in one of the detent grooves 111 of the detent groove section 11 of the mounting seat 10, whereby the support seat 21 of the outer sleeve 20 is positioned in a height position corresponding to the detent groove 111.

[0035] It will be on Fig. 10, Fig. 11 and Fig. 22 Reference is made. When actuating the actuating section 31 in the direction of arrow E in Fig. 20, Arrow direction H in Fig. 21 and arrow direction I in Fig. 22 the locking projection 34 of the pull unit 30 in the direction of arrow F in Fig. 21 moves synchronously. In this case, the actuating section 31 is moved into the sliding space 25 [see Fig. 22].

[0036] As in Fig. 17, Fig. 18, Fig. 20 and Fig. As shown in Figure 21, the two sliding wings 341 are positionally limited in the two inclined guide grooves 36 of the traction unit 30. At the same time, they can move along the inclined guide grooves 36 in the direction of arrow C. Fig. 20 move so that the up and down movement of the pulling unit 30 is in lateral displacement of the locking projection 34 in the direction of arrow F in Fig. 21 is converted.

[0037] The cover strip 33 has a guide hole 331 into which the locking projection 34 engages, but is not restricted by it. The up and down movement of the pull unit 30 in the direction of arrow E in Fig. 20 and in the direction of arrow H in Fig. 21 converted into a transverse displacement of the locking projection 34, the locking projection 34 in the guide hole 331 can be limited in such a way that it can be displaced in the guide hole 331 in the transverse direction, as in Fig. 21 shown. This allows the locking projection 34 to engage stably and precisely in the respective detent groove 111.

[0038] As in Fig. 10 and Fig. As shown in Figure 11, the spring element 35 is located between the upper spring mounting section 231 and the lower spring mounting section 321.

[0039] When actuating the actuating section 31 in the direction of arrow E in Fig. 20, Arrow direction H in Fig. 21 and arrow direction I in Fig. 22 the locking projection 34 of the pull unit 30 in the direction of arrow F in Fig. 21 moved synchronously. In this case, the locking projection 34 is separated from the detent groove 111 of the detent groove section 11 of the mounting seat 10 into an unlocked state, as shown in Fig. 20 to Fig. 22 shown. In this case, the mounting seat 10 remains stationary, while the outer sleeve 20 and the pull unit 30 can move up and down relative to the mounting seat 10, as shown in the direction of arrow D in Fig. 20 and in the direction of arrow G in Fig. 21 shown.

[0040] After the outer sleeve 20 and the pull unit 30 have been set into position or moved up and down, the actuating section 31 can be released, whereby the locking projection 34 engages in a further detent groove 111 of the detent groove section 11 of the mounting seat 10 in a locked state under the influence of the restoring force of the spring element 35 [see Fig. 18 and Fig. 19].

[0041] The following will be discussed Fig. 4, Fig. 5, Fig. 23 and Fig. 24 Reference is made to the outer sleeve 20 in relation to the mounting seat 10 in the direction of arrow K. Fig. 5 and in the direction of arrow J in Fig. 24 moves up and down for height adjustment, the up and down movement of the outer sleeve 20 takes place between a highest point H [see Fig. 24] and a lowest point L [see Fig. 23] instead. The mounting seat 10 or the mounting position A [see Fig. 4 and Fig. 5] is located between the highest point H and the lowest point L of the movement of the outer sleeve 20 [see Fig. 23 and Fig. 24].

[0042] Compared to the prior art, the height adjustment device according to the invention has the following advantages: 1. The outer sleeve 20 according to the invention is moved up and down relative to the mounting seat 10 for height adjustment [see arrow direction J in Fig. 24 Fig.], the mounting seat 10 or the mounting position A is located [see Fig. 4 and Fig. 5] between the highest point H and the lowest point L of the movement of the outer sleeve 20 [see Fig. 23, Fig.

[24] . Viewed from the left and right sides of the chair 4, the mounting seat 10 of the height adjustment device 1 is not exposed. Therefore, the outer sleeve 20 can create a suitable shielding effect on the mounting seat, thus ensuring a unique appearance and an appealing exterior for the furniture. At the same time, this will improve the furniture's competitiveness on the market. 2. Compared to the state of the art [see Fig. 25], in which the vertical movement adjustment is to be achieved by a two-part structure consisting of a sliding seat 10a and a fastening section 30a, the height adjustment device 1 according to the invention can be attached to the chair 4 by means of an integrated one-piece structure of the fastening seat 10 for vertical movement adjustment, which contributes to saving manufacturing costs. Reference symbol list A mounting position H highest point L lowest point 1 Height adjustment device 10 Mounting seat 11 Locking groove section 111 Locking groove 12 Rail groove section 13 Fastening section 14 Stabilizing element 20 Outer sleeve 21 Support seat 22 actuation windows 23 sliding seat 231 upper spring mounting section 24 Cover unit 241 first cover plate 2411 first long recess 242 second cover plate 2421 second long recess 25 sliding space 30 train units 31 Actuation section 32 recordings 321 lower spring mounting section 33 Cover strip 331 Guide hole 34 Locking projection 341 sliding wings 35 Spring element 36 inclined guide grooves 1a Height adjustment device 10a Sliding seat 20a Outer sleeve 30a Fastening section 2 chair armrests 3 Tabletop 4 chairs 4a Backrest 4b seat

Claims

[1] Height adjustment device (1) which is attached to the side of a piece of furniture or office furniture and which has: a mounting seat (10) comprising a locking groove section (11), a rail groove section (12) and a mounting section (13), wherein the locking groove section (11) is provided with a plurality of vertically arranged, spaced-apart and communicating locking grooves (111), and wherein the mounting section (13) is mounted in a mounting position (A) on one side of the furniture or office furniture; and an outer sleeve (20) which is connected to the outside of the mounting seat (10) in a rail-like manner and which can move up and down along the rail groove section (12), wherein the outer sleeve (20) has a support seat (21) and an actuating window (22), and wherein the support seat (21) is arranged at the upper end of the outer sleeve (20), and wherein the actuating window (22) is located on one side of the outer sleeve (20) and communicates with the interior of the outer sleeve (20); wherein the outer sleeve (20) further comprises a sliding seat (23), the sliding seat (23) being located in the outer sleeve (20); and wherein the height adjustment device further comprises a pull unit (30) which is arranged to be slidably up and down in the sliding seat (23) of the outer sleeve (20), wherein the pull unit (30) has an actuating section (31), a receiving groove (32) and a locking projection (34), and wherein the actuating section (31) extends from the upper end of the pull unit (30) and projects out of the actuating window (22) of the outer sleeve (20), and wherein the actuating section (31) serves to ensure convenient actuation for the user, and wherein a spring element (35) is arranged in the receiving groove (32), and wherein the locking projection (34) can engage in one of the detent grooves (111) of the detent groove section (11) of the mounting seat (10) under the influence of the clamping force of the spring element (35) on the pull unit (30), thereby locking the support seat (21) of the outer sleeve (20) in a is positioned at the corresponding height position of the locking groove (111); wherein the locking projection (34) of the pull unit (30) is moved synchronously when the actuating section (31) is actuated, such that the locking projection (34) is separated from the detent groove (111) of the detent groove section (11) of the mounting seat (10) into an unlocked state, and wherein the mounting seat (10) remains stationary, allowing the outer sleeve (20) and the pull unit (30) to move upwards and downwards with respect to the mounting seat (10); wherein, after the position has been set by moving the outer sleeve (20) and the pull unit (30) up and down, the actuating section (31) can be released, the locking projection (34) engaging in a further detent groove (111) of the detent groove section (11) of the mounting seat (10) in a locked state under the influence of the restoring force of the spring element (35); and wherein, when the outer sleeve (20) is moved up and down relative to the mounting seat (10) for height adjustment, the up and down movement of the outer sleeve (20) occurs between a highest point (H) and a lowest point (L), wherein the mounting seat (10) or the mounting position (A) is located between the highest point (H) and the lowest point (L) of the movement of the outer sleeve (20); characterized by , that the cover unit (24) is provided on one side of the outer sleeve (20) for covering the train unit (30), wherein the cover unit (24) consists of a first cover plate (241) and a second cover plate (242) which are joined to form a single unit, and wherein the first cover plate (241) is mounted on the train unit (30) and is provided with a downwardly opening first long recess (2411), and wherein the second cover plate (242) is mounted on the first cover plate (241) and is provided with a downwardly opening second long recess (2421), and wherein the first long recess (2411) and the second long recess (2421) are aligned sequentially, the cover plates (241, 242) engaging in the rail groove section (12) through the long recesses (2411, 2421) to create an up- and down-to-down motion. To enable movement. [2] Height adjustment device (1) according to claim 1, characterized by , - that the pulling unit (30) is formed on opposite sides of the lower end of the pulling unit (30) with an inclined guide groove (36) and is inclined downwards towards the outside; and - that a sliding wing (341) protrudes on each of the left and right sides of the locking projection (34), wherein the two sliding wings (341) are position-limited in the two inclined guide grooves (36) of the pull unit (30) and these can move simultaneously along the inclined guide grooves (36) in such a way that the up and down movement of the pull unit (30) can be converted into a transverse displacement of the locking projection (34). [3] Height adjustment device (1) according to claim 2, characterized by, that the pull unit (30) further comprises a cover strip (33) located between the sliding seat (23) and the locking groove section (11), wherein the cover strip (33) has a guide hole (331) into which the locking projection (34) engages, and wherein, when the up and down movement of the pull unit (30) is converted into a transverse displacement of the locking projection (34), the locking projection (34) can be limited in the guide hole (331) so that it can be displaced in the guide hole (331) in a transverse direction. [4] Height adjustment device (1) according to claim 1, characterized by, that the spring element (35) is designed as a spring, wherein the sliding seat (23) is provided with an upper spring mounting section (231), and wherein a lower spring mounting section (321) is arranged in the receiving groove (32) opposite the upper spring mounting section (231), and wherein the spring element (35) is located between the upper spring mounting section (231) and the lower spring mounting section (321). [5] Height adjustment device (1) according to claim 1, characterized by, that the actuating section (31) is arranged at the upper end of the pull unit (30), wherein a sliding space (25) is formed inside the upper section of the outer sleeve (20), and wherein the sliding space (25) adjoins the actuating window (22), and wherein the actuating section (31) enters the sliding space (25) when the locking projection (34) arranged on the pull unit (30) is moved synchronously when the actuating section (31) is actuated for height adjustment. [6] Height adjustment device (1) according to claim 1, characterized by , that the mounting seat (10) is provided on its outer edge with a plurality of stabilizing elements (14) which lie between the mounting seat (10) and the sliding seat (23). [7] Height adjustment device (1) according to claim 1, characterized by , that the actuating section (31) of the pulling unit (30) is detachably arranged on the pulling unit (30). [8] Height adjustment device (1) according to claim 1, characterized by , that the fastening section (13) of the fastening seat (10) is designed as a long and narrow projection, wherein the furniture or office furniture is a chair (4) having a backrest (4a) and a seat (4b), wherein the height adjustment device (1) is attached at an angle to the side of the backrest (4a) of the chair (4) by means of the fastening section (13). [9] Height adjustment device (1) according to claim 1, characterized by , that the support seat (21) of the outer sleeve (20) serves to connect to a chair armrest (2) or a table top (3).

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