Locking-free office chair armrest up-down adjusting mechanism
By directly cooperating with the positioning block and the positioning groove of the sleeve, the buckle adjustment seat and the internal rack of the armrest column are eliminated, and the simple and reliable up and down adjustment of the office chair armrest is achieved, which solves the problem of low reliability in the existing technology, reduces the risk of wear and tear and increases the service life.
Patent Information
- Application Number
- CN202422035883.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-08-21
AI Technical Summary
The existing adjustment structure of the office chair armrest requires the coordination of multiple components, which has the problems of low reliability and easy jamming.
The positioning block is directly matched with the positioning groove of the sleeve, the buckle adjustment seat and the internal rack of the handrail column are eliminated, and the height adjustment is achieved by the swing of the positioning block, which simplifies the structure and improves reliability.
The number of parts is reduced, production costs are lowered, reliability and operating experience are improved, the risk of wear is reduced, and assembly and maintenance are simplified.
Smart Images
Figure CN223392177U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of office equipment, in particular to a non-locking up-and-down adjustment mechanism for an office chair armrest. Background Art
[0002] At present, there is a disclosed office desk and chair lifting armrest, which includes an armrest fixing rod, an armrest column and an armrest lifting cover from left to right, the armrest column is provided with a rectangular lifting through hole, and a plurality of evenly arranged latches are provided on the rear side of the lifting through hole, the bottom end of the armrest column is placed on the bracket at the bottom of the armrest fixing rod, the upper part of the armrest fixing rod is connected to the armrest column through the armrest lifting cover, the armrest fixing rod and the armrest lifting cover are respectively provided with a left boss and a right boss placed in the lifting through hole, and a tooth buckle assembly that cooperates with the latch is further provided between the armrest fixing rod and the armrest lifting cover, the tooth buckle assembly includes a spring, a buckle and The buckle adjustment seat has cylindrical bosses on the left and right sides of the buckle, a spring placement hole is provided on the front side of the buckle, and a buckle tooth engaged with the buckle is provided on the rear side of the buckle. The buckle adjustment seat has a small rectangular through hole, and trapezoidal bosses are provided on the left and right sides. The two trapezoidal bosses cooperate with the above-mentioned cylindrical bosses. One end of the spring is placed in the spring placement hole, and the other end is in contact and connected with the spring limiting protrusion on the right side of the upper part of the armrest fixing rod. A left sliding groove that cooperates with the buckle adjustment seat is provided on the rear side of the upper part of the armrest fixing rod, and a sliding groove that cooperates with the buckle adjustment seat and is symmetrical with the left sliding groove is provided on the left side of the armrest lifting cover. When adjusting upwards, when the armrest column is continuously lifted to the highest point, the upper end of the buckle adjustment seat hits the top of the interior of the lifting hole. At this time, the external force of lifting the armrest column causes the trapezoidal boss to cooperate with the cylindrical boss, separating the buckle teeth from the latch teeth. The armrest column is affected by gravity and slides freely to the lowest point. After reaching the lowest point, the lower end of the buckle adjustment seat collides with the bottom end of the interior of the lifting hole. After the collision, the trapezoidal boss and the cylindrical boss separate. Under the action of spring tension, the buckle teeth re-engage with the latch teeth; thus, the function of lifting the armrest column upward can be resumed. The above-mentioned office desk and chair lifting armrest has the following shortcomings: it requires the buckle adjustment seat, the buckle and the internal rack of the armrest column to cooperate. First, the number of parts is large, which will reduce the reliability of internal adjustment. Second, the movement trajectory of the buckle is a linear reciprocating, which has the risk of getting stuck and also reduces the reliability of adjustment. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a non-locking office chair armrest up and down adjustment mechanism which changes the original linear movement to active swing to achieve buckle positioning, reduces the number of parts, increases reliability and makes the structure simpler.
[0004] The technical solution of the present utility model is to provide a non-locking office chair armrest up and down adjustment mechanism with the following structure, comprising an armrest body, a column with height adjustment inside and a joint; the joint is located at the bottom of the column, the top of the column is provided with a boss, and the bottom of the armrest body is rotatably connected to the top of the boss; the armrest body comprises a panel and a base; the column comprises a cylinder body, a column tube, a sleeve, an adjustment guide rod, a positioning block and a spring; the cylinder body is sleeved outside the column tube, the bottom of the column tube is fixed to the joint, the top of the adjustment guide rod is fixed to the armrest body, the positioning block and the spring are arranged in the sleeve, the bottom of the adjustment guide rod is movably embedded in the sleeve and is positioned at any height position by the positioning block and the spring, the adjustment guide rod is only adjusted in one direction upward, and is driven to retract to the lowest position by a reset mechanism at the highest point.
[0005] The adjusting guide rod is provided with several positioning grooves along the height direction, and there is a partition between the adjacent upper and lower positioning grooves. The positioning grooves are inclined downward, and the positioning block is provided with a positioning end, which is embedded in one of the positioning grooves and is positioned by the elastic force provided by the spring.
[0006] The housing is provided with a cavity, and the body of the positioning block is movably embedded in the cavity.
[0007] The positioning block is provided with a first notch, and the cavity is provided with a protrusion. The inner wall of the first notch abuts against the protrusion so that the positioning block swings in the cavity with the abutment point as the fulcrum. The positioning end is located at the top of the positioning block and protrudes along one side; one end of the spring abuts against the positioning block, and the other end abuts against the inner wall of the cavity. The spring pushes the positioning block so that the positioning end abuts against one of the positioning grooves to position the height of the column.
[0008] The specific structure of the reset mechanism is as follows: a reset end is provided on the top of the positioning block; a second notch with an opening facing downward is provided on the top of the housing, and a guide groove is provided on the bottom; when the column is extended to the highest position, the positioning end enters the guide groove, and the positioning block swings so that the reset end is embedded in the second notch. At this time, the positioning end of the positioning block disengages from the positioning groove, allowing the housing to slide freely.
[0009] A partition is provided on the inner side of the top of the housing. When the column is retracted to the shortest position, the partition pushes the reset end out of the second notch. At this time, the handrail is pulled up to embed the positioning end into one of the positioning grooves for positioning.
[0010] The inclination angle of the positioning groove is consistent with the inclination angle of the positioning end, and the angle α between the positioning groove and the column is 25-35 degrees.
[0011] After adopting the above structure, the utility model has the following advantages:
[0012] 1. The original structure of the buckle adjustment seat, buckle and internal rack coordination of the handrail column is cancelled, and an adjustment structure with direct coordination between the positioning block and the positioning groove of the sleeve is adopted, making it simpler and reducing the number of parts, thereby reducing production costs and improving reliability during use.
[0013] 2. Height adjustment is achieved by embedding the positioning block and the positioning slots of different heights in the sleeve. During adjustment, the positioning block uses swinging to achieve positioning. Compared with linear reciprocating sliding, the swinging adjustment reduces the area of direct contact between components, which helps to reduce friction and reduce the risk of jamming due to friction or wear. Since direct contact between moving parts is reduced, this design can reduce mechanical wear, thereby improving the reliability and service life of the entire adjustment structure. By eliminating the original buckle adjustment seat, buckle and rack inside the handrail column, the new design not only reduces the number of parts, but also simplifies the overall structure, making assembly easier while reducing manufacturing costs. Fewer moving parts means simpler maintenance and replacement of damaged parts. The swinging adjustment method may bring a smoother operating experience, and users can more easily adjust to the desired height.
[0014] As an improvement, the adjustment guide rod is provided with several positioning grooves along the height direction, and there is a partition between the adjacent upper and lower positioning grooves. The positioning groove is inclined downward, and the positioning block is provided with a positioning end. The positioning end is embedded in one of the positioning grooves and is positioned by the elastic force provided by the spring. This structure facilitates the embedding and positioning of the positioning end and the corresponding positioning groove when adjusting the height, and ensures positioning reliability.
[0015] As an improvement, the housing is provided with a cavity, and the body of the positioning block is movably embedded in the cavity. The cavity provides a swing space for the positioning block, and the side walls provide positioning in two directions during the swing.
[0016] As an improvement, the positioning block is provided with a first notch, and the cavity is provided with a protrusion. The inner wall of the first notch abuts against the protrusion so that the positioning block swings in the cavity with the abutment point as the fulcrum, and the positioning end is located at the top of the positioning block and protrudes along one side; one end of the spring abuts against the positioning block, and the other end abuts against the inner wall of the cavity. The spring pushes the positioning block so that the positioning end abuts against one of the positioning grooves to locate the height of the column, that is, the positioning block is a lever, and the fulcrum of rotation is the contact point between the two.
[0017] As an improvement, a reset end is provided at the top of the positioning block; a second notch with an opening facing downward is provided at the top of the housing, and a guide groove is provided at the bottom; when the column is extended to the highest position, the positioning end enters the guide groove, and the positioning block swings so that the reset end is embedded in the second notch. At this time, the positioning end of the positioning block disengages from the positioning groove and allows the housing to slide freely. The reset structure is simple, reliable, and ingenious.
[0018] As an improvement, a partition is provided on the inner side of the top of the shell. When the column is retracted to the shortest position, the partition pushes the reset end out of the second notch. At this time, the armrest is pulled up to embed the positioning end into one of the positioning grooves for positioning. The reset is automatically performed without the need to press a button. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a three-dimensional diagram of the office chair armrest of the present invention.
[0020] Figure 2 This is an exploded view of the office chair armrest of the present invention.
[0021] Figure 3 This is a cross-sectional view of the office chair armrest of the present invention.
[0022] Figure 4 This is a schematic diagram of the connection between the positioning block and the housing of the utility model.
[0023] Figure 5 This is a schematic diagram of the separation of the positioning block and the housing of the utility model.
[0024] Figure 6 It is a three-dimensional diagram of the positioning block of the utility model.
[0025] Figure 7 This is a schematic diagram of the interior of the adjusting guide rod of the present invention.
[0026] As shown in the figure:
[0027] 1. Armrest body, 2. Joint, 3. Cylinder body, 4. Column tube, 5. Shell, 6. Adjustment guide rod, 7. Positioning block, 8. Spring, 9. Positioning groove, 10. Partition, 11. Positioning end, 12. Cavity, 13. First notch, 14. Protrusion, 15. Reset end, 16. Second notch, 17. Guide groove, 18. Reset plate. DETAILED DESCRIPTION
[0028] The present invention will be further described below with reference to the accompanying drawings.
[0029] like Figure 1-7 As shown, the utility model is a non-locking office chair armrest up and down adjustment mechanism, including an armrest body 1, an internal column with height adjustment and a joint 2; the armrest body 1 includes a panel and a base, and the top surface of the armrest body 1 is wrapped with a panel made of polyurethane material. The polyurethane armrest panel has a high resilience and slow rebound foam system, providing a comfortable touch and support force, ensuring comfort and safety in use.
[0030] The joint 2 is located at the bottom of the column, a boss is provided on the top of the column, and the bottom of the armrest body 1 is rotatably connected to the top of the boss; the armrest body 1 is only connected through the boss when rotating, making the rotation more flexible.
[0031] The column includes a cylinder body 3, a column tube 4, a sleeve 5, an adjustment guide rod 6, a positioning block 7 and a spring 8; the cylinder body 3 is sleeved on the outside of the column tube 4, the bottom of the column tube 4 is fixed to the joint 2, the top of the adjustment guide rod 6 is fixed to the armrest body 1, the positioning block 7 and the spring 8 are arranged in the sleeve 5, the bottom of the adjustment guide rod 6 is movably embedded in the sleeve 5 and is positioned at any height position by the positioning block 7 and the spring 8, the adjustment guide rod is only adjusted in one direction upward, and is driven inward to the lowest position at the highest point by the reset mechanism.
[0032] The adjusting guide rod 6 is provided with a plurality of positioning slots 9 along the height direction, which are determined according to the height of the column. The height of all the positioning slots is smaller than the height of the column.
[0033] like Figure 3 As shown, there is a partition 10 between the two adjacent upper and lower positioning grooves 9, the positioning groove 9 is tilted downward, the tilt angle of the positioning groove 9 is consistent with the tilt angle of the positioning end 11, and the angle α with the column is 25 to 35 degrees, as shown in FIG. Figure 7 shown.
[0034] like Figure 4 and Figure 6 As shown, the positioning block 7 is provided with a positioning end 11, which is inserted into one of the positioning slots 9 and is positioned by the elastic force provided by the spring 8. After the positioning end 11 is inserted into the positioning slot 9, the spring 8 pushes the positioning block 7, so that the positioning end 11 has a certain thrust to be positioned in the positioning slot 9, thereby fixing the height of the column at a certain level.
[0035] like Figure 4 and Figure 5 As shown, the housing 5 is provided with a cavity 12, and the body of the positioning block 7 is movably embedded in the cavity 12. The positioning block 7 is provided with a first notch 13, and the cavity 12 is provided with a protrusion 14. The protrusion 14 is a right-angled protrusion, and the first notch 13 is an obtuse-angle structure. The inner wall of the first notch 13 abuts against the protrusion 14, and the first notch 13 abuts against the protrusion 14, with the top angle of the protrusion 14 as the support point, so that the positioning block 7 swings in the cavity 12 with the abutment point as the fulcrum.
[0036] The positioning end 11 is located at the top of the positioning block 7 and protrudes along one side. One end of the spring 8 abuts against the positioning block 7. A connecting rod is provided at this end of the positioning block 7. One end of the spring 8 is sleeved on the connecting rod to prevent the two from falling off. The other end of the spring 8 abuts against the inner wall of the cavity 12. A connecting rod is also provided on the inner wall. The spring 8 sleeves on the connecting rod of this inner wall. The spring 8 pushes the positioning block 7 so that the positioning end 11 abuts against one of the positioning slots 9, thereby determining the height of the column.
[0037] like Figure 5 As shown, the specific structure of the reset mechanism is as follows: the positioning block 7 is located at the core position, with a reset end 15 designed on its top. Simultaneously, the top of the housing 5 is provided with a second, downward-facing notch 16, and its bottom is provided with a guide groove 17. When the column is fully extended to its highest position, the positioning end 11 accurately enters the guide groove 17, allowing the positioning block 7 to swing, allowing the reset end 15 to smoothly engage the second notch 16. This action causes the positioning end 11 to disengage from the positioning groove 9, allowing the housing 5 to slide freely, facilitating height adjustment by the user.
[0038] A reset plate 18 is specially provided on the inner side of the top of the housing 5. When the upright is retracted to its shortest position, the reset plate 18 pushes the reset end 15 of the positioning block 7 out of the second notch 16. This action returns the positioning block 7 to its initial position. At this point, the user can pull up on the armrest to cause the positioning end 11 to engage with one of the positioning slots 9, thus achieving positioning.
Claims
1. A non-locking office chair armrest up and down adjustment mechanism, characterized by: The utility model comprises an armrest body (1), a column with height adjustment inside and a joint (2); the joint (2) is located at the bottom of the column, the top of the column is provided with a boss, and the bottom of the armrest body (1) is rotatably connected to the top of the boss; the armrest body (1) comprises a panel and a base; the column comprises a barrel (3), a column tube (4), a casing (5), an adjustment guide rod (6), a positioning block (7) and a spring (8); the barrel (3) is sleeved outside the column tube (4), the bottom of the column tube (4) is fixed to the joint (2), the top of the adjustment guide rod (6) is fixed to the armrest body (1), the positioning block (7) and the spring (8) are arranged in the casing (5), the bottom of the adjustment guide rod (6) is movably embedded in the casing (5) and is positioned at any height position by the positioning block (7) and the spring (8), the adjustment guide rod (6) is only adjusted in one direction upward, and is driven to retract to the lowest position by a reset mechanism at the highest point.
2. The non-locking office chair armrest up and down adjustment mechanism according to claim 1, characterized in that: The adjusting guide rod (6) is provided with a plurality of positioning grooves (9) along the height direction, a partition (10) is provided between two adjacent upper and lower positioning grooves (9), the positioning grooves (9) are tilted downward, and the positioning block (7) is provided with a positioning end (11), the positioning end (11) is embedded in one of the positioning grooves (9) and is positioned by the elastic force provided by the spring (8).
3. The non-locking office chair armrest up and down adjustment mechanism according to claim 2, characterized in that: The housing (5) is provided with a cavity (12), and the body of the positioning block (7) is movably embedded in the cavity (12).
4. The non-locking office chair armrest up and down adjustment mechanism according to claim 3, characterized in that: The positioning block (7) is provided with a first notch (13), and the cavity (12) is provided with a protrusion (14). The inner wall of the first notch (13) abuts against the protrusion (14), thereby causing the positioning block (7) to swing in the cavity (12) with the abutment point as a fulcrum. The positioning end (11) is located at the top of the positioning block (7) and protrudes along one side. One end of the spring (8) abuts against the positioning block (7), and the other end abuts against the inner wall of the cavity (12). The spring (8) pushes the positioning block (7) so that the positioning end (11) abuts against one of the positioning grooves (9) to determine the height of the positioning column.
5. The non-locking office chair armrest up and down adjustment mechanism according to claim 4, characterized in that: The specific structure of the reset mechanism is as follows: the top of the positioning block (7) is provided with a reset end (15); the top of the housing (5) is provided with a second notch (16) with an opening facing downward, and the bottom is provided with a guide groove (17); when the column is in the highest extended position, the positioning end (11) enters the guide groove (17), the positioning block (7) swings to make the reset end (15) fit into the second notch (16), and at this time, the positioning end (11) of the positioning block (7) is disengaged from the positioning groove (9), allowing the housing (5) to slide freely.
6. The non-locking office chair armrest up and down adjustment mechanism according to claim 5, characterized in that: A reset plate (18) is provided on the inner side of the top of the housing (5). When the column is retracted to the shortest position, the reset plate (18) pushes the reset end (15) out of the second notch (16). At this time, the handrail is pulled up to allow the positioning end (11) to be embedded in one of the positioning grooves (9) for positioning.
7. The non-locking office chair armrest up and down adjustment mechanism according to claim 2, characterized in that: The inclination angle of the positioning groove (9) is consistent with the inclination angle of the positioning end (11), and the included angle α with the column is 25-35°.