Height adjustment structure

Abstract

The present invention provides a height adjustment structure for use in conjunction with furniture or office furniture such as chair armrests. It includes a fixed seat, an outer sleeve, and a pull rod. When a driving portion of the pull rod is driven to synchronously drive a locking block on the pull rod to adjust and move, the locking block will disengage from one of the card slots on the fixed seat to form an unlocked state. At this time, the fixed seat remains stationary, and the outer sleeve can be adjusted and moved up and down relative to the fixed seat. The stroke of the up and down adjustment movement of the outer sleeve includes a highest point and a lowest point, and the fixed seat or the fixed position of the fixed seat is between the highest point and the lowest point of the stroke of the outer sleeve. Therefore, the outer sleeve can produce an appropriate shielding effect on the fixed seat to enhance the fashionable aesthetic feeling and value feeling of the furniture.

Description

Technical Field

[0001] The present invention relates to a height adjustment structure, particularly a height adjustment structure that can be used in conjunction with furniture or office furniture such as chair armrests and can produce an appropriate shielding effect to enhance the fashionable aesthetic feeling and value feeling of the furniture. Background Art

[0002] Reference Figure 25 , a height adjustment structure 1a provided by the prior art for use in conjunction with furniture or office furniture, taking a chair armrest as an example for illustration but not limitation here, generally consists of a sliding seat 10a, an outer sleeve 20a and a fixing member 30a. The sliding seat 10a is fixed on the fixing member 30a, the outer sleeve 20 is slidably sleeved outside the sliding seat 10a, and the fixing member 30a is installed on the left or right side edge of the seat 4b of a chair 4 (i.e., the furniture or office furniture referred to in this case); when adjusting the height of the outer sleeve 20a (i.e., the height of the chair armrest 2), the sliding seat 10a and the fixing member 30a remain stationary, and the outer sleeve 20a can be adjusted and moved up and down relative to the sliding seat 10a and the fixing member 30a, so that objects such as a chair armrest or a table board installed on the outer sleeve 20a can be adjusted and moved up and down together.

[0003] However, when viewed from the perspective of the left and right sides of the chair 4 (i.e., the furniture or office furniture referred to in this case), the appearance of the height adjustment structure 1a significantly presents a two-section structural form with an outer sleeve 20a and a fixing member 30a, and the fixing member 30a is exposed and visible, relatively affecting or reducing the fashionable aesthetic feeling and value feeling of the furniture (such as the chair 4), and even affecting the purchasing desire of consumers. Summary of the Invention

[0004] The main purpose of the present invention is to provide a height adjustment structure for use in conjunction with furniture or office furniture such as chair armrests. When a user drives a driving part to synchronously drive a clamping block on a pull rod to adjust and move, an outer sleeve can be adjusted and moved up and down relative to a fixed seat; when the outer sleeve is adjusted and moved up and down relative to the fixed seat, the stroke of the up and down adjustment movement of the outer sleeve includes a highest point and a lowest point. At this time, the fixed seat or the fixed position of the fixed seat is between the height ranges of the highest point and the lowest point of the stroke of the outer sleeve, so that the outer sleeve can produce an appropriate shielding effect on the fixed seat or the fixed position of the fixed seat, relatively enhancing the fashionable aesthetic feeling and value feeling of the furniture.

[0005] To achieve the above object, the height adjustment structure of the present invention includes a fixed seat, an outer sleeve, and a pull rod; wherein the fixed seat has a card slot portion, a rail groove portion, and a fixing portion. The card slot portion has a plurality of card slots arranged at intervals in the vertical direction and communicating with each other. The fixing portion is used for installing and fixing at a fixed position on one side of furniture or office furniture; wherein the outer sleeve is connected to the outside of the fixed seat and can slide up and down along the rail groove portion. The outer sleeve has a bearing seat, an operation window, and a sliding seat. The bearing seat is located at the top of the outer sleeve. The operation window is located on one side of the outer sleeve and communicates with the inside of the outer sleeve. The sliding seat is located inside the outer sleeve; wherein the pull rod is slidably received in the sliding seat of the outer sleeve. The pull rod has a driving portion, an elastic member seat, and a locking block. The driving portion extends from the top of the pull rod and protrudes outside the operation window of the outer sleeve for the user to operate. An elastic member is provided inside the elastic member seat; wherein by the elastic force of the elastic member, the locking block can be locked into one of the card slots in the card slot portion of the fixed seat, so that the bearing seat of the outer sleeve is positioned at a height position corresponding to the card slot; wherein when the user drives the driving portion to synchronously drive the locking block on the pull rod to adjust and move, the locking block will disengage from one of the card slots in the card slot portion of the fixed seat to form an unlocked state. At this time, the fixed seat remains stationary, and the outer sleeve and the pull rod can be adjusted and moved up and down relative to the fixed seat; wherein after the outer sleeve and the pull rod are adjusted and moved up and down, the user releases the driving portion. At this time, the locking block can be locked into another one of the card slots in the card slot portion of the fixed seat by the restoring force of the elastic member and return to the locked state; wherein when the outer sleeve is adjusted and moved up and down relative to the fixed seat, the stroke of the up and down adjustment movement of the outer sleeve includes a highest point and a lowest point. At this time, the fixed seat or the fixed position of the fixed seat is within the height range between the highest point and the lowest point of the stroke of the outer sleeve.

[0006] In a preferred embodiment of the present invention, a pair of corresponding inclined guide grooves are respectively provided on two opposite side edges at the lower end of the pull rod. The inclined guide grooves extend obliquely downward toward the outside; wherein a sliding wing is respectively protruded on the left and right sides of the locking block. The two sliding wings are respectively limited in the two inclined guide grooves of the pull rod and can move relative to each other along each inclined guide groove, so that the up and down displacement of the pull rod can be converted into the lateral displacement of the locking block.

[0007] In a preferred embodiment of the present invention, a gasket is further provided on the pull rod for covering the elastic member seat and being located between the sliding seat and the card slot portion. The gasket has a guiding hole for the locking block to pass through. When the up and down linear displacement of the pull rod is converted into the lateral displacement of the locking block, the guiding hole can limit the locking block in the guiding hole to perform lateral displacement.

[0008] In a preferred embodiment of the present invention, the elastic member is further a spring; wherein an upper spring mounting portion is provided on the sliding seat; wherein a lower spring mounting portion corresponding to the upper spring mounting portion is further provided on the elastic member seat; and wherein the elastic member is disposed between the upper spring mounting portion and the lower spring mounting portion.

[0009] In a preferred embodiment of the present invention, the outer sleeve further includes a covering member disposed on one side edge of the outer sleeve for covering the pull rod. The covering member is formed by integrally clamping a first covering plate and a second covering plate. The first covering plate covers the pull rod and is provided with a first long slot opening with a downward notch. The second covering plate covers the first covering plate and is provided with a second long slot opening with a downward notch. The first long slot opening and the second long slot opening correspond to each other; wherein the first long slot opening and the second long slot opening of the covering member can be connected to the rail groove portion for sliding in the up and down direction.

[0010] In a preferred embodiment of the present invention, the driving portion is located at the top of the pull rod; wherein an inner portion of the top of the outer sleeve further includes a sliding space adjacent to the operation window; and wherein when a user drives the driving portion to synchronously drive the locking block on the pull rod to adjust and move, the driving portion will move into the sliding space.

[0011] In a preferred embodiment of the present invention, a plurality of anti-vibration members are provided on the outer edge of the fixed seat for abutting between the fixed seat and the sliding seat.

[0012] In a preferred embodiment of the present invention, the driving portion of the pull rod is detachably disposed on the pull rod.

[0013] In a preferred embodiment of the present invention, the fixing portion of the fixed seat is a long and narrow-shaped clamping block; wherein the furniture or office furniture is a chair, and the chair has a backrest and a seat; and wherein the height adjustment structure is further inclined at an angle by the fixing portion and combined with the side edge of the backrest of the chair.

[0014] In a preferred embodiment of the present invention, the bearing seat of the outer sleeve is combined with an armrest or a tabletop.

[0015] Compared with the prior art, the present invention can enable the outer sleeve to produce an appropriate shielding effect on the fixed seat to enhance the fashionable aesthetic feeling and value feeling of the furniture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Combined three-dimensional schematic diagram of an embodiment of the present invention.

[0017] Figure 2 is Figure 1 Side view plane schematic diagram of

[0018] Figure 3Schematic diagram of the present invention used on a chair and combined with an armrest and a tabletop.

[0019] Figure 4 Side view plane schematic diagram of the present invention used on a chair.

[0020] Figure 5 For Figure 4 Side view plane schematic diagram after the outer sleeve is adjusted and moved upward.

[0021] Figure 6 Exploded three-dimensional schematic diagram of one perspective of the present invention.

[0022] Figure 7 Exploded three-dimensional schematic diagram of another perspective of the present invention.

[0023] Figure 8 Three-dimensional schematic diagram of the pull rod of the present invention.

[0024] Figure 9 Exploded three-dimensional schematic diagram of one perspective of the pull rod of the present invention combined with the outer sleeve.

[0025] Figure 10 For Figure 9 Combined three-dimensional schematic diagram.

[0026] Figure 11 For Figure 10 Side cross-sectional schematic diagram.

[0027] Figure 12 Partially enlarged exploded three-dimensional schematic diagram of the gasket of the present invention combined with the pull rod.

[0028] Figure 13 For Figure 12 Combined three-dimensional schematic diagram.

[0029] Figure 14 Exploded three-dimensional schematic diagram of one perspective of the fixing seat of the present invention combined with the covering member.

[0030] Figure 15 Exploded three-dimensional schematic diagram of one perspective of the fixing seat and the covering member of the present invention combined with the outer sleeve.

[0031] Figure 16 Combined three-dimensional schematic diagram of one perspective of the fixing seat and the covering member of the present invention combined with the outer sleeve.

[0032] Figure 17 Plane schematic diagram when the present invention is tilted at an angle.

[0033] Figure 18 For Figure 17 Cross-sectional schematic diagram.

[0034] Figure 19is Figure 10 Partial side view plane schematic diagram of

[0035] Figure 20 is Figure 17 Schematic diagram of the upward sliding of the outer sleeve of

[0036] Figure 21 is Figure 20 Cross-sectional schematic diagram of

[0037] Figure 22 is Figure 19 Schematic diagram of the driving of the pull rod of

[0038] Figure 23 Side view plane schematic diagram of the outer sleeve of the present invention moving to the lowest point in its stroke.

[0039] Figure 24 Side view plane schematic diagram of the outer sleeve of the present invention moving to the highest point in its stroke.

[0040] Figure 25 Stereo schematic diagram of an embodiment in the prior art.

[0041] Explanation of reference numerals: A - fixed position; H - highest point; L - lowest point; 1 - height adjustment structure; 10 - fixed seat; 11 - card slot part; 111 - card slot; 12 - rail groove part; 13 - fixing part; 14 - anti - sway part; 20 - outer sleeve; 21 - bearing seat; 22 - operation window; 23 - sliding seat; 231 - upper spring mounting part; 24 - covering part; 241 - first cover plate; 2411 - first long slot; 242 - second cover plate; 2421 - second long slot; 25 - sliding space; 30 - pull rod; 31 - driving part; 32 - elastic part seat; 321 - lower spring mounting part; 33 - gasket; 331 - guiding hole; 34 - locking block; 341 - sliding wing; 35 - elastic part; 36 - inclined sliding hole; 1a - height adjustment structure; 10a - sliding seat; 20a - outer sleeve; 30a - fixing part; 2 - armrest; 3 - table board; 4 - chair; 4a - chair back; 4b - chair seat. Detailed description of the specific implementation

[0042] In conjunction with the drawings, the structure and its technical features of the present invention will be described in detail as follows. Each drawing is only used to illustrate the structural relationship and related functions of the present invention. Therefore, the dimensions of each component in each drawing are not drawn according to the actual proportion and are not used to limit the present invention.

[0043] The height adjustment structure of the present invention is installed and used in furniture or office furniture (such as a chair). Therefore, the "left - right" direction mentioned in the following disclosure is in the direction of the sitter of the chair. As Figures 3 to 5As shown, the furniture or office furniture is illustrated by taking an office chair 4 as an example herein, but not limited thereto. The chair 4 has a chair back 4a and a seat 4b.

[0044] The height adjustment structure 1 of the present embodiment is installed and used in cooperation with the side of the chair back 4a of the chair 4 as Figures 3 to 5 shown. When the user sits on the seat 4b of the chair 4, the height adjustment structures 1 on both left and right sides can be easily operated to adjust the height. The height adjustment structure 1 includes a fixed seat 10, an outer sleeve 20, and a pull rod 30.

[0045] The fixed seat 10 has a slot portion 11, a rail groove portion 12, and a fixing portion 13 as Figure 6 and 7 shown. The slot portion 11 has a plurality of slots 111 arranged at intervals in the up-and-down direction and communicating with each other as Figure 14 and 16 shown. In the present embodiment, the fixing portion 13 is a long and narrow-shaped block (but not limited) for being embedded and fixed at a fixed position A on one side of the chair back 4a of the chair 4 as Figure 4 and 5 shown. In the present embodiment, the fixing portion 13 is completely embedded and hidden in the fixed position A without being exposed, but not limited thereto.

[0046] The height adjustment structure 1 is further inclined at an angle and combined with the side of the chair back 4a of the chair 4 by means of the fixing portion 13 as Figures 3 to 5 shown, so as to display the fashionable design aesthetic feeling and value feeling of the chair 4 in cooperation with the bending curve of the chair back 4a.

[0047] The outer sleeve 20 is connected to the outside of the fixed seat 10 and can slide up and down along the rail groove portion 12 as Figure 1 in the direction of arrow A in Figure 2 and the direction of arrow B in Figure 6 and 7 shown. The outer sleeve 20 has a bearing seat 21, an operation window 22, a sliding seat 23, a cover plate 24, and a sliding space 25, but not limited thereto, as Figures 1 to 3 shown. The bearing seat 21 is located at the top of the outer sleeve 20 for being combined with an armrest 2 or a table board 3, but not limited thereto, as Figure 6 , 7 , 9 to 11 shown. The sliding seat 23 is located inside the outer sleeve 20 and the sliding seat 23 is provided with an upper spring mounting portion 231, but not limited thereto, as Figures 9 to 11 shown. The covering member 24 is provided on one side of the outer sleeve 20 for covering the pull rod 30, but not limited thereto, as Figure 6 ,7 As shown in FIGS. 15, the sliding space 25 is located inside the top of the outer sleeve 20 and adjacent to the operation window 22, but is not limited to the following description. Figures 9 to 11 As shown.

[0048] The covering member 24 is formed by clamping a first cover plate 241 and a second cover plate 242 together, but is not limited to this. The first cover plate 241 is screwed to the sliding seat 23 and covers the pull rod 30 so that the related structure of the pull rod 30 is not exposed. The first cover plate 241 is provided with a first long slot 2411 with a downward notch. The second cover plate 242 is clamped and covers the first cover plate 241 by hooks to be able to shield the screws on the first cover plate 241 and the related structure on the sliding seat 23 to maintain simplicity and beauty. The second cover plate 242 is provided with a second long slot 2421 with a downward notch. Among them, the first long slot 2411 corresponds to the second long slot 2421, and the first long slot 2411 and the second long slot 2421 can be connected to the rail groove portion 12 together (as shown in FIGS. Figure 6 , 7 , 14 to 16) to slide up and down.

[0049] In addition, a plurality of anti-vibration members 14 are provided on the outer edge of the fixed seat 10 for abutting between the fixed seat 10 and the sliding seat 23, but are not limited to the following description. Figure 6 , 7 As shown in FIGS. 15, for maintaining the stability of the outer sleeve 20 during up and down sliding (similar to a damping effect).

[0050] The pull rod 30 is slidably received in the sliding seat 23 of the outer sleeve 20 as shown in FIGS. Figures 10 to 13 , the pull rod 30 has a driving portion 31, an elastic member seat 32, a gasket 33, a locking block 34, an elastic member 35 and an inclined guide groove 36, but is not limited to the following description. Figures 6 to 8 , the driving portion 31 extends from the top end of the pull rod 30 and protrudes outside the operation window 22 of the outer sleeve 20 for the user to operate as shown in FIGS. Figure 10 , 11 , 19 and 22, and the driving portion 31 is detachably provided on the pull rod 30 as shown in FIGS. Figure 9 for facilitating installation and accelerating production. The elastic member seat 32 is further provided with a lower spring mounting portion 321 corresponding to the upper spring mounting portion 231, but is not limited to the following description. Figure 6 , 9 to 11, the gasket 33 is used to cover the elastic member seat 32 and is located between the sliding seat 23 and the card slot portion 11, but is not limited to the following description. Figure 18 and 21 as shown, the left and right sides of the locking block 34 are respectively protruded to form a sliding wing 341, but is not limited to the following description.Figure 6 , 7 As shown in FIGS. 9 and others, the elastic member 35 is further a spring, but not limited thereto. The inclined guide slots 36 are provided on two opposite sides at the lower end of the pull rod 30 and correspond to each other, and the inclined guide slots 36 extend obliquely downward toward the outside as shown in Figure 7 , 8 and FIGS. 17; as shown in Figure 18 , 19 , FIGS. 21 to 24, wherein by the elastic force of the elastic member 35, the locking block 34 of the pull rod 30 can be locked into one of the card slots 111 in the card slot portion 11 on the fixed seat 10, so that the bearing seat 21 of the outer sleeve 20 is positioned at a height position corresponding to the card slot 111.

[0051] Refer to Figure 10 , 11 and FIGS. 22. When the user drives the driving portion 31 (as shown by the arrow E direction in Figure 20 , the arrow H direction in Figure 21 and the arrow I direction in Figure 22 ) to synchronously drive the locking block 34 on the pull rod 30 to adjust and move (as shown by the arrow F direction in Figure 21 ), the driving portion 31 will move into the sliding space 25 as shown in Figure 22 .

[0052] Refer to Figure 17 , 18 , FIGS. 20 and 21. The two sliding wings 341 are respectively limited in the two inclined guide slots 36 of the pull rod 30 and can move relative to each other along each inclined guide slot 36 (as shown by the arrow C direction in Figure 20 ), so that the vertical displacement of the pull rod 30 can be converted into the lateral displacement of the locking block 34 as shown by the arrow F direction in Figure 21 .

[0053] The gasket 33 has a guiding hole 331 for the locking block 34 to pass through, but not limited thereto. When the vertical displacement of the pull rod 30 is converted (as shown by the arrow E direction in Figure 20 and the arrow H direction in Figure 21 ) into the lateral displacement of the locking block 34 (as shown by the arrow F direction in Figure 21 ), the guiding hole 331 can limit the locking block 34 in the guiding hole 331 for lateral displacement as shown in Figure 21 , so that the locking block 34 can stably and accurately enter each of the card slots 111.

[0054] Refer to, for example, Figure 10 and 11 . The elastic member 35 is provided between the upper spring mounting portion 231 and the lower spring mounting portion 321.

[0055] When the user drives the driving part 31 (as shown by the direction of arrow E in Figure 20 , the direction of arrow H in Figure 21 , and the direction of arrow I in Figure 22 ) to synchronously drive the movement of the locking block 34 on the pull rod 30 for adjustment (as shown by the direction of arrow F in Figure 21 ), the locking block 34 will disengage from one of the slots 111 in the slot portion 11 of the fixed seat 10 to form an unlocked state as shown in Figures 20 to 22 . At this time, the fixed seat 10 remains stationary, and the outer sleeve 20 and the pull rod 30 can be adjusted and moved up and down relative to the fixed seat 10 as shown by the direction of arrow D in Figure 20 and the direction of arrow G in Figure 21 .

[0056] After the outer sleeve 20 and the pull rod 30 are adjusted and moved up and down, the user releases the driving part 31. At this time, the locking block 34 can be engaged into another slot 111 in the slot portion 11 of the fixed seat 10 by the restoring force of the elastic member 35 and return to the locked state as shown in Figure 18 and 19 .

[0057] Refer to Figure 4 , 5 , 23 and 24. When the outer sleeve 20 is adjusted and moved up and down relative to the fixed seat 10 as shown by the direction of arrow K in Figure 5 and the direction of arrow J in Figure 24 , the stroke of the up and down adjustment movement of the outer sleeve 20 includes a highest point H (as shown in Figure 24 ) and a lowest point L (as shown in Figure 23 ). At this time, the fixed seat 10 or the fixed position A (as shown in Figure 4 and 5 ) is within the height range between the highest point H and the lowest point L of the stroke of the outer sleeve 20 as shown in Figure 23 and 24 .

[0058] Compared with the prior art, the present invention has the following advantages:

[0059] (1) When the outer sleeve 20 of the present invention is adjusted and moved up and down relative to the fixed seat 10 (as shown by the direction of arrow J in Figure 24 ), the fixed seat 10 or the fixed position A (as shown in Figure 4 and 5 ) is within the height range between the highest point H and the lowest point L of the stroke of the outer sleeve 20 as shown in Figure 23 and 24As shown, when viewed from the perspectives of the left and right sides of the chair 4, the fixing base 10 of the height adjustment structure 1 will not be exposed outward. Therefore, the outer sleeve can provide an appropriate shielding effect on the fixing base, enhancing the stylish aesthetic and value sense of the furniture, which is conducive to improving the market competitiveness of the furniture.

[0060] (2) The height adjustment structure 1 of the present invention can be fixed to the chair 4 through a one-piece structure (the fixing base 10) for up-and-down movement adjustment, without relying on a two-piece structure of a sliding seat 10a and a fixing member 30a as in the prior art (as Figure 25 shown), which is conducive to cost savings for the manufacturing side.

[0061] The above description is illustrative rather than restrictive to the present invention. Those of ordinary skill in the art understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all of them will fall within the protection scope of the present invention.

Claims

1. A height adjustment structure is provided for being combined with or mounted on one side edge of furniture or office furniture. Here, the side edge of the height adjustment structure close to the furniture or office furniture is defined as the inner side of the height adjustment structure, and the other side edge relative to the inner side of the height adjustment structure is defined as the outer side of the height adjustment structure. Characterized in that: The height adjustment structure comprises: A fixed seat located on the inner side of the height adjustment structure. The fixed seat has a card slot portion, a rail groove portion and a fixing portion. The card slot portion is located on the outer side of the fixed seat and has a plurality of card slots arranged at intervals in the up and down direction and communicating with each other. The fixing portion is located on the inner side of the fixed seat and is used for being installed and fixed at a fixed position on the side edge of the furniture or office furniture. The fixed position is close to the inner side of the fixed seat. An outer sleeve located on the outer side of the height adjustment structure. The inner side of the outer sleeve is connected to the outside of the fixed seat and can slide up and down along the rail groove portion. The outer sleeve has a bearing seat, an operation window and a sliding seat. The bearing seat is located at the top end of the outer sleeve. The operation window is located on one side edge of the outer sleeve and communicates with the inside of the outer sleeve. The sliding seat is located inside the outer sleeve and faces the outer side of the fixed seat. And A pull rod is slidably received in the sliding seat of the outer sleeve in the up and down direction. The pull rod has a driving portion, an elastic member seat and a locking block. The driving portion extends from the top end of the pull rod and protrudes outside the operation window of the outer sleeve for the user to operate. An elastic member is provided in the elastic member seat. Wherein, by the elastic force of the elastic member, the locking block can be locked into one of the card slots in the card slot portion on the fixed seat, so that the bearing seat of the outer sleeve can be positioned at a height position corresponding to the card slot. When the user drives the driving portion to synchronously drive the locking block on the pull rod to adjust and move, the locking block will disengage from one of the card slots in the card slot portion on the fixed seat to form an unlocked state. At this time, the fixed seat located on the inner side of the outer sleeve remains stationary, and the outer sleeve and the pull rod can be adjusted and moved up and down relative to the fixed seat. After the outer sleeve and the pull rod are adjusted and moved up and down, the user releases the driving portion. At this time, the locking block can be locked into another one of the card slots in the card slot portion on the fixed seat by the restoring force of the elastic member and return to the locked state. When the outer sleeve is adjusted and moved up and down relative to the fixed seat located on the inner side of the outer sleeve, the stroke of the up and down adjustment movement of the outer sleeve includes a highest point and a lowest point. At this time, the fixed seat located on the inner side of the outer sleeve or the fixed position close to the inner side of the fixed seat is within the height range between the highest point and the lowest point of the stroke of the outer sleeve, so that the fixing portion of the fixed seat or the fixed position close to the inner side of the fixed seat is always kept inside the outer sleeve and shielded by the outer sleeve without being exposed.

2. The height adjustment structure according to claim 1, Characterized in that: On two opposite sides at the lower end of the pull rod, there are respectively provided with a pair of corresponding inclined guide grooves which extend obliquely downward and outward; wherein on the left and right sides of the clamping block, there are respectively protruded with a sliding wing, and the two sliding wings are respectively limited in the two inclined guide grooves of the pull rod and can move relatively along each inclined guide groove, so that the vertical displacement of the pull rod can be converted into the lateral displacement of the clamping block.

3. The height adjustment structure according to claim 2, characterized in that: A gasket is further provided on the pull rod for covering the elastic member seat and being located between the sliding seat and the clamping groove portion. The gasket has a guiding hole for the clamping block to pass through. When the vertical displacement of the pull rod is converted into the lateral displacement of the clamping block, the guiding hole can limit the clamping block in the guiding hole for lateral displacement.

4. The height adjustment structure according to claim 1, characterized in that: The elastic member is a spring; wherein an upper spring mounting portion is provided on the sliding seat; wherein a lower spring mounting portion corresponding to the upper spring mounting portion is provided on the elastic member seat; and wherein the elastic member is arranged between the upper spring mounting portion and the lower spring mounting portion.

5. The height adjustment structure according to claim 1, characterized in that: The outer sleeve further includes a covering member which is arranged on one side edge of the outer sleeve for covering the pull rod. The covering member is formed by clamping a first cover plate and a second cover plate into one body. The first cover plate covers the pull rod and is provided with a first long slot opening with a downward concave notch. The second cover plate covers the first cover plate and is provided with a second long slot opening with a downward concave notch. The first long slot opening and the second long slot opening correspond to each other; wherein the first long slot opening and the second long slot opening of the covering member can be connected to the rail groove portion for sliding in the vertical direction.

6. The height adjustment structure according to claim 1, characterized in that: The driving portion is located at the top of the pull rod; wherein the interior of the top of the outer sleeve includes a sliding space which is adjacent to the operation window; and wherein when the user drives the driving portion to synchronously drive the clamping block on the pull rod to adjust and move, the driving portion will move into the sliding space.

7. The height adjustment structure according to claim 1, characterized in that: A plurality of anti-vibration members are provided on the outer edge of the fixed seat for abutting between the fixed seat and the sliding seat.

8. The height adjustment structure according to claim 1, characterized in that: The driving portion of the pull rod is detachably arranged on the pull rod.

9. The height adjustment structure according to claim 1, characterized in that: The fixing portion of the fixed seat is a long and narrow-shaped clamping block; wherein the furniture or office furniture is a chair which has a backrest and a seat; and wherein the height adjustment structure is obliquely combined with the side edge of the backrest of the chair by the fixing portion at an angle.

10. The height adjustment structure according to claim 1, characterized in that: The bearing seat of the outer sleeve is for combining with an armrest or a table board.

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