Locking device arranged on telescopic supporting leg and telescopic supporting leg

Abstract

The utility model provides a locking device arranged on a telescopic supporting leg and the telescopic supporting leg, and aims to solve the problem that the locking device on the telescopic supporting leg in the prior art is unreasonable in structural design, so that the operation is inconvenient when people adjust the height of the supporting leg. A locking device arranged on a telescopic supporting leg comprises a connecting piece used for being fixedly connected with an inner pipe of the telescopic supporting leg, the outer side of the connecting piece is sleeved with an expansion sleeve, and the expansion sleeve is axially limited relative to the connecting piece; the expansion sleeve is provided with an expansion position and a recovery position, and the connecting piece is provided with an expanding part; when the connecting piece is rotated in the forward direction relative to the expansion sleeve to enable the opening part to be located at the expansion position, the expansion sleeve expands and is used for fixedly connecting the inner pipe and the outer pipe of the telescopic supporting leg through expansion. State switching is carried out on the locking device in a rotating mode, and operation of a user is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of furniture, and in particular relates to a locking device arranged on a telescopic supporting leg and the telescopic supporting leg. Background Art

[0002] At present, some furniture such as chairs, stools, tables, etc. are designed with retractable supporting legs to facilitate different people to use or to be used in different occasions, so as to facilitate different people to adjust to a suitable height. The locking device structure design for locking the inner tube and the outer tube on the current retractable supporting legs is unreasonable, which makes it very inconvenient for people to operate when they need to adjust the extension length of the inner tube relative to the outer tube. Utility Model Content

[0003] The utility model provides a locking device arranged on a telescopic supporting leg and a telescopic supporting leg, aiming to solve the problem that the locking device on the telescopic supporting leg in the prior art has an unreasonable structural design, which causes inconvenience in operation when people adjust the height of the supporting leg.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] In a first aspect, the utility model provides a locking device configured on a telescopic support leg, comprising a connecting piece for fixedly connecting to an inner tube of the telescopic support leg, an expansion sleeve is provided on the outer side of the connecting piece and the expansion sleeve is axially limited relative to the connecting piece; the expansion sleeve is provided with an expansion position and a restoration position, and the connecting piece is provided with a propping portion;

[0006] When the connecting piece is rotated forwardly relative to the expansion sleeve so that the expanded portion is located in the expanded position, the expansion sleeve expands and is used to fix the inner tube and the outer tube of the telescopic support leg through expansion; when the connecting piece is rotated reversely relative to the expansion sleeve so that the expanded portion is located in the restored position, the expansion sleeve is restored.

[0007] A further solution is that a limit assembly is provided between the expansion sleeve and the connecting piece for limiting the angle of forward and reverse rotation of the connecting piece relative to the expansion sleeve.

[0008] Based on the above technical solution: the limit assembly limits the angle of the connecting part when rotating forward and reversely relative to the expansion sleeve, thereby preventing the connecting part from rotating too far forward or reversely during rotation, avoiding the problem of the locking device failing to lock the height of the supporting leg after adjusting its height, making it safer.

[0009] A further solution: the expansion portion is an eccentric column eccentrically arranged on the connecting piece, the expansion sleeve is an arc with an opening on one side, and the expansion sleeve is arranged on the outside of the eccentric column.

[0010] Based on the above technical solution: the eccentric column expands or restores the expansion sleeve by rotating, which is very convenient for adjusting the length of the supporting leg.

[0011] A further solution: both end surfaces of the eccentric column are provided with baffles with a diameter larger than that of the eccentric column, and the expansion sleeve is axially limited between the two baffles.

[0012] A further solution is that a groove which is sunken in the direction of the wall thickness of the expansion sleeve is provided on the side of the expansion sleeve away from the opening.

[0013] Based on the above technical solution: the groove is sunken in the wall thickness direction of the expansion sleeve, so that the expansion sleeve has better elasticity, thereby facilitating the expansion sleeve to open to both sides at its opening when expanding.

[0014] A further solution is that there are two grooves and the two grooves are symmetrically arranged on opposite sides of the opening.

[0015] A further solution: the baffle is circular.

[0016] A further solution: the limiting assembly comprises an arc-shaped limiting groove circumferentially arranged around the expansion sleeve and a limiting block arranged on the outside of the connecting piece, and the limiting block is located in the limiting groove.

[0017] Based on the above technical solution: the arc-shaped limit groove has two end limit positions in the circumferential direction, so that when the connecting piece rotates, the limit block is limited between the two limit positions to prevent the connecting piece from rotating too much relative to the expansion sleeve, making the locking device safer.

[0018] In the second aspect, the utility model provides a telescopic supporting leg, comprising an outer tube, an inner tube and a locking device configured on the telescopic supporting leg as described in the scheme of the first aspect, wherein the inner tube and the locking device are both located inside the outer tube, and the connecting piece is fixedly connected to the inner tube; when the connecting piece is rotated forwardly relative to the expansion sleeve so that the expanded portion is located in the expanded position, the expansion sleeve expands and fixes the inner tube and the outer tube of the telescopic supporting leg together; when the connecting piece is rotated reversely relative to the expansion sleeve so that the expanded portion is located in the restored position, the expansion sleeve is restored and the inner tube can be telescoped relative to the outer tube.

[0019] The beneficial effects of the utility model are:

[0020] In the utility model, the connecting piece and the expansion sleeve arranged on the outside of the connecting piece are extended into the outer tube together with the inner tube when in use, so that the expansion sleeve can be expanded by rotating the connecting piece forwardly. After the expansion sleeve is expanded, it abuts against the inner wall of the outer tube to realize the fixed connection between the inner tube and the outer tube, thereby locking the height of the supporting leg; when it is necessary to adjust the height of the supporting leg, the support part can be rotated to the recovery position by rotating the connecting piece in the reverse direction, at which time the shape of the expansion sleeve is restored, so that the inner tube and the expansion sleeve can be extended and retracted relative to the outer tube; the state of the locking device is switched by rotation, which is convenient for user operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a locking device arranged on a telescopic supporting leg of the utility model in a first direction.

[0023] Figure 2 It is a structural schematic diagram of the second direction of a locking device configured on a telescopic supporting leg of the utility model.

[0024] Figure 3 The utility model is a schematic diagram of the exploded structure of a locking device arranged on a telescopic supporting leg.

[0025] Figure 4 It is a structural schematic diagram of a telescopic supporting leg of the utility model.

[0026] Description of the numbers in the figure:

[0027] 1-outer tube; 11-tube sleeve; 2-inner tube; 3-connecting piece; 31-baffle; 32-eccentric column; 33-limiting block; 4-expansion sleeve; 41-opening; 42-groove; 43-limiting groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the utility model.

[0029] Embodiment 1

[0030] like Figures 1 to 4 As shown, this embodiment provides a locking device configured on a telescopic support leg, comprising a connecting piece 3 for fixedly connecting to an inner tube 2 of the telescopic support leg, an expansion sleeve 4 is sleeved on the outer side of the connecting piece 3 and the expansion sleeve 4 is axially limited relative to the connecting piece 3; the expansion sleeve 4 is provided with an expansion position and a recovery position, and the connecting piece 3 is provided with a propping portion;

[0031] When the connecting piece 3 is rotated forwardly relative to the expansion sleeve 4 so that the expanded portion is located in the expanded position, the expansion sleeve 4 expands and is used to fix the inner tube 2 and the outer tube 1 of the telescopic supporting leg through expansion. After expansion, the expansion sleeve 4 abuts against the inner wall of the outer tube 1, and at this time, the expanded portion on the connecting piece 3 is in the expanded position, so that the connecting piece 3 is locked with the inner wall of the expansion sleeve 4, thereby realizing the fixed connection between the inner tube 2 and the outer tube 1, so that the height of the telescopic supporting leg is locked; when the connecting piece 3 is rotated reversely relative to the expansion sleeve 4 so that the expanded portion is located in the recovery position, the expansion sleeve 4 recovers, and after the expansion sleeve 4 recovers under the action of its own elastic force, the locking effect on the outer tube 1 and the inner tube 2 is released, and at this time the telescopic length of the inner tube 2 relative to the outer tube 1 can be adjusted.

[0032] In this embodiment, the diameter of the connecting piece 3 can be set to be slightly smaller than the diameter of the inner wall of the outer tube 1 and consistent with the diameter of the inner tube 2, so as to facilitate sliding in the outer tube 1. The diameter of the expansion sleeve 4 can be set to be slightly smaller than the diameter of the inner wall of the outer tube 1 when it is restored, so as to facilitate full locking with the outer tube 1 after expansion.

[0033] On the basis of the above scheme, in order to avoid the problem that the locking device fails to lock the height of the supporting leg due to the connector 3 rotating too far forward relative to the expansion sleeve 4 after adjusting the height of the supporting leg, this embodiment provides a limit assembly for limiting the angle of the connector 3 rotating forward and backward relative to the expansion sleeve 4 between the expansion sleeve 4 and the connector 3. The limit assembly limits the angle of the connector 3 rotating forward and backward relative to the expansion sleeve 4, thereby preventing the connector 3 from rotating too far forward or backward during rotation, avoiding the problem that the locking device fails to lock the height of the supporting leg after adjusting the height of the supporting leg, and making it safer.

[0034] In this embodiment, Figure 1 and Figure 2As shown, as a specific structure of the expansion part and the expansion sleeve 4, the expansion part is an eccentric column 32 eccentrically arranged on the connecting member 3, and the expansion sleeve 4 is an arc with an opening 41 on one side, and the expansion sleeve 4 is sleeved on the outside of the eccentric column 32. The thickness of the expansion sleeve 4 can be set to gradually become thinner from the opening 41 to the side away from the opening 41. When in the restored position, the eccentric groove surrounded by the inner wall of the expansion sleeve 4 is sleeved on the outside of the eccentric column 32. Therefore, when the eccentric column 32 rotates from the restored position to the expanded position, due to the eccentric effect, the expansion sleeve 4 is gradually expanded to abut against the inner wall of the outer tube 1. At this time, the eccentric column 32 cannot continue to rotate in the forward direction, thereby realizing the fixed connection between the inner tube 2 and the outer tube 1.

[0035] In this embodiment, as a structure for axially limiting the expansion sleeve 4 and the eccentric column 32, baffles 31 with a diameter larger than the eccentric column 32 are provided on both end surfaces of the eccentric column 32, and the expansion sleeve 4 is axially limited between the two baffles 31, so that the inner tube 2 drives the expansion sleeve 4 to slide in the outer tube 1. The baffle 31 can be set to be circular, and its diameter is slightly smaller than the inner wall diameter of the outer tube 1.

[0036] like Figure 3 As shown, in order to facilitate the expansion sleeve 4 to open, a groove 42 recessed in the wall thickness direction of the expansion sleeve 4 is provided on the side of the expansion sleeve 4 away from the opening 41 in this embodiment. There are two grooves 42, and the two grooves 42 are symmetrically arranged on opposite sides of the opening 41. The wall thickness of the expansion sleeve 4 becomes thinner at the position of the groove 42, so as to facilitate opening when subjected to force, and the groove 42 can be set to be arc-shaped.

[0037] In this embodiment, Figure 2 and Figure 3 As shown, as a specific implementation of the limit assembly, the limit assembly includes an arc-shaped limit groove 43 circumferentially arranged around the expansion sleeve 4 and a limit block 33 arranged on the outside of the connecting member 3, and the limit block 33 is located in the limit groove 43. Specifically, the limit groove 43 is arranged at the end of the expansion sleeve 4 away from the outer tube 1, and the limit block 33 is arranged on the outside of the end of the eccentric column 32 away from the outer tube 1. In the restored position, the limit block 33 is located at the end of one side of the limit groove 43. When the limit block 33 rotates to the end of the other side of the limit groove 43, it indicates to the user that the inner tube 2 and the outer tube 1 have been locked.

[0038] Embodiment 2

[0039] like Figure 4As shown, this embodiment provides a telescopic support leg, comprising an outer tube 1, an inner tube 2 and a locking device configured on the telescopic support leg as described in the first embodiment, wherein the inner tube 2 and the locking device are both located in the outer tube 1, and the connecting member 3 is fixedly connected to the inner tube 2; when the connecting member 3 is rotated forward relative to the expansion sleeve 4 so that the expansion portion is located in the expansion position, the expansion sleeve 4 expands and the inner tube 2 and the outer tube 1 of the telescopic support leg are fixedly connected; when the connecting member 3 is rotated reversely relative to the expansion sleeve 4 so that the expansion portion is located in the recovery position, the expansion sleeve 4 recovers, and the inner tube 2 can be telescopic relative to the outer tube 1. The telescopic support leg can be a support leg on furniture such as a stool or a chair, and the outer tube 1 is fixedly connected to the seat plate or seat frame of the stool or chair, or is connected to the table top of a table. The lower end of the inner tube 2 is supported on the ground. In order to facilitate user adjustment, a patterned pipe sleeve 11 can also be provided at the lower end of the outer tube 1, and the pipe sleeve 11 is fixedly sleeved on the outer side of the outer tube 1.

[0040] Working principle description:

[0041] When the inner tube 2 is rotated forward, the eccentric column 32 will drive the opening 41 of the expansion sleeve 4 to open, and the expansion sleeve 4 will gradually expand until it abuts against the inner wall of the outer tube 1. At this time, the inner tube 2 is locked with the outer tube 1, and the limit block 33 abuts against the end of the limit groove 43, so that the eccentric column 32 cannot continue to rotate. When the inner tube 2 is rotated in the reverse direction, the eccentric column 32 returns to the recovery position of the expansion sleeve 4. At this time, the expansion sleeve 4 is restored due to the elastic force, and can slide relative to the outer tube 1 after recovery, thereby releasing the locking state between the inner tube 2 and the outer tube 1, and the user can adjust the height of the support leg by pushing and pulling the inner tube 2.

[0042] The present utility model is not limited to the above optional implementation modes. Under the premise of not conflicting with each other, the various schemes can be combined arbitrarily. Anyone can derive other forms of products under the inspiration of the present utility model. However, no matter what changes are made in their shapes or structures, all technical schemes that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.

Claims

1. A locking device configured on a telescopic support leg, characterized in that: It comprises a connecting piece for fixed connection with the inner tube of the telescopic support leg, the outer side of the connecting piece is provided with an expansion sleeve and the expansion sleeve is axially limited relative to the connecting piece; the expansion sleeve is provided with an expansion position and a recovery position, and the connecting piece is provided with a propping portion; When the connecting piece is rotated forward relative to the expansion sleeve so that the expanded portion is located at the expanded position, the expansion sleeve expands and is used to fix the inner tube and the outer tube of the telescopic support leg through expansion; when the connecting piece is rotated backward relative to the expansion sleeve so that the expanded portion is located at the restored position, the expansion sleeve is restored; A limit assembly is provided between the expansion sleeve and the connecting piece for limiting the angle of the connecting piece to rotate in the forward and reverse directions relative to the expansion sleeve; The expansion part is an eccentric column eccentrically arranged on the connecting member, the expansion sleeve is an arc with an opening on one side, and the expansion sleeve is arranged on the outside of the eccentric column; A groove which is recessed in the wall thickness direction of the expansion sleeve is provided on one side of the expansion sleeve away from the opening; there are two grooves which are symmetrically arranged on opposite sides of the opening.

2. A locking device configured on a telescopic support leg according to claim 1, characterized in that: Both end surfaces of the eccentric column are provided with baffles with a diameter larger than that of the eccentric column, and the expansion sleeve is axially limited between the two baffles.

3. A locking device configured on a telescopic support leg according to claim 2, characterized in that: The baffle is circular.

4. The locking device configured on the telescopic support leg according to claim 1, characterized in that: The limiting assembly comprises an arc-shaped limiting groove circumferentially arranged around the expansion sleeve and a limiting block arranged outside the connecting piece, and the limiting block is located in the limiting groove.

5. A telescopic support leg, characterized in that: It comprises an outer tube, an inner tube and a locking device arranged on a telescopic supporting leg as claimed in any one of claims 1 to 4, wherein the inner tube and the locking device are both located inside the outer tube, and the connecting piece is fixedly connected to the inner tube; when the connecting piece is rotated in the forward direction relative to the expansion sleeve so that the expanded portion is located in the expanded position, the expansion sleeve expands and the inner tube and the outer tube of the telescopic supporting leg are fixedly connected; when the connecting piece is rotated in the reverse direction relative to the expansion sleeve so that the expanded portion is located in the restored position, the expansion sleeve is restored and the inner tube can be telescoped relative to the outer tube.

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