Safety lifting chair

Abstract

The present invention relates to the technical field of lift chairs, and specifically discloses a safety lift chair. The safety lift chair includes a base, a support column, a seat cushion, an adjustment column and an adjustment mechanism; the support column is arranged on the base, and the support column has an installation cavity in the vertical direction; the adjustment column is arranged on the seat cushion, and the adjustment column can be inserted into the installation cavity; wherein the adjustment mechanism includes a screw, a worm gear, a bevel gear, a ratchet and a driving handle, one end of the screw is fixedly connected to the adjustment column; the worm gear is rotatably arranged on the support column, and the inner shaft of the worm gear is meshed and connected to the screw; the bevel gear is rotatably arranged on the support column, and the bevel gear is meshed and connected to the worm gear; one end of the driving handle is rotatably arranged on the support column, and the ratchet is rotatably arranged on the driving handle; the driving handle can drive the ratchet to move the bevel gear. The safety lift chair of the present invention can realize the height adjustment of the seat cushion without using a cylinder, thereby avoiding the direct harm to personal safety caused by the explosion of the cylinder, thereby improving the safety performance of the lift chair.

Description

Technical Field

[0001] The present invention relates to the technical field of lift chairs, in particular to a safety lift chair. Background Art

[0002] Pneumatic lift chairs are chairs that move up and down using a cylinder. The piston rod in the cylinder can move up and down under pressure, and cooperate with the adjustment handle of the seat to achieve the lifting function of the chair. Due to its convenient adjustment, pneumatic lift chairs are widely used in offices and public places.

[0003] However, pneumatic lift chairs have safety hazards. If the nitrogen filled in the cylinder of the pneumatic lift chair is not pure enough, the ambient temperature is too high, and the height is adjusted up and down frequently, causing constant friction between the piston rod and the cylinder wall, the gas may expand rapidly and explode, causing direct harm to personal safety.

[0004] Therefore, a safe lifting chair is needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a safe lifting chair to solve the problem that cylinder explosion occurs in the lifting chair of the prior art, thereby causing direct harm to personal safety.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a safety lifting chair, which comprises:

[0008] Base;

[0009] A support column, the support column is arranged on the base, and the support column is provided with an installation cavity along the vertical direction;

[0010] A seat cushion and an adjustment column, wherein the adjustment column is arranged on the seat cushion and can be inserted into the installation cavity;

[0011] An adjusting mechanism comprises a screw, a worm wheel, a bevel gear, a pawl and a driving handle, wherein one end of the screw is fixedly connected to the adjusting column; the worm wheel is rotatably arranged on the supporting column, and the inner shaft of the worm wheel is meshingly connected to the screw; the bevel gear is rotatably arranged on the supporting column, and the bevel gear is meshingly connected to the worm wheel; one end of the driving handle is rotatably arranged on the supporting column, and the pawl is rotatably arranged on the driving handle; the driving handle can drive the pawl to move the bevel gear so that the adjusting column moves upward along the vertical direction.

[0012] As an optional solution of the above-mentioned safety lifting chair, the above-mentioned adjustment mechanism also includes a first elastic member, and two ends of the above-mentioned first elastic member are respectively connected to the above-mentioned driving handle and the above-mentioned pawl for driving the above-mentioned pawl to reset.

[0013] As an optional solution for the above-mentioned safety lifting chair, the above-mentioned safety lifting chair also includes an auxiliary support mechanism, which includes a driving plate, an adjustment support frame and a second elastic member. The above-mentioned driving plate is slidably mounted on the above-mentioned screw rod, and the two ends of the above-mentioned second elastic member are respectively connected to the inner wall of the above-mentioned installation cavity and the above-mentioned adjustment support frame; the above-mentioned second elastic member always has a tendency to move the above-mentioned adjustment support frame away from the inner wall of the above-mentioned installation cavity in the horizontal direction, so that the above-mentioned adjustment column can abut against the above-mentioned adjustment support frame in the above-mentioned vertical direction; the above-mentioned driving handle can drive the above-mentioned driving plate to squeeze the above-mentioned adjustment support frame, so that the above-mentioned adjustment support frame moves along the above-mentioned horizontal direction toward the direction close to the inner wall of the above-mentioned installation cavity.

[0014] As an optional solution for the above-mentioned safety lifting chair, a first lower inclined block is provided at the end of the above-mentioned driving plate, and a first upper inclined block is protrudingly provided on the side wall of the above-mentioned adjustment support frame, and the lower inclined surface of the above-mentioned first lower inclined block can abut against the upper inclined surface of the above-mentioned first upper inclined block; the above-mentioned driving handle can drive the above-mentioned driving plate to move downward along the above-mentioned vertical direction.

[0015] As an optional solution for the above-mentioned safety lifting chair, a rack is arranged on the above-mentioned driving plate, and the above-mentioned rack is extended along the above-mentioned vertical direction; a half gear is arranged at one end of the above-mentioned driving handle, and the above-mentioned half gear can be meshed with the above-mentioned rack.

[0016] As an optional solution for the above-mentioned safety lifting chair, a second lower inclined block is protrudingly provided on the side wall of the above-mentioned adjustment support frame, and a second upper inclined block is protrudingly provided on the side wall of the above-mentioned adjustment column; when the above-mentioned adjustment column moves downward along the above-mentioned vertical direction, the upper end of the above-mentioned second lower inclined block can abut against the lower end of the above-mentioned second upper inclined block; when the above-mentioned adjustment column moves upward along the above-mentioned vertical direction, the lower inclined surface of the above-mentioned second lower inclined block can abut against the upper inclined surface of the above-mentioned second upper inclined block.

[0017] As an optional solution for the above-mentioned safety lifting chair, a support ring plate is provided on the above-mentioned support column, and the above-mentioned support ring plate is arranged between the above-mentioned adjustment column and the above-mentioned adjustment support frame; the above-mentioned support ring plate is provided with a matching groove, and the above-mentioned second lower inclined block is slidably arranged in the above-mentioned matching groove along the above-mentioned horizontal direction.

[0018] As an optional solution for the above-mentioned safety lifting chair, a plurality of the above-mentioned matching grooves and the above-mentioned second lower inclined blocks are provided, and the plurality of the above-mentioned matching grooves and the plurality of the above-mentioned second lower inclined blocks are arranged at intervals along the above-mentioned vertical direction; the plurality of the above-mentioned matching grooves and the plurality of the above-mentioned second lower inclined blocks are arranged in a one-to-one correspondence.

[0019] As an optional solution for the above-mentioned safety lifting chair, the above-mentioned seat cushion includes a support plate, a hollow layer, a plastic layer and an outer layer, the above-mentioned adjustment column is fixedly connected to the above-mentioned support plate; the above-mentioned hollow layer is provided on the above-mentioned support plate, and the above-mentioned plastic layer is provided on the above-mentioned hollow layer; the above-mentioned outer layer is wrapped around the above-mentioned support plate, the above-mentioned hollow layer and the above-mentioned plastic layer.

[0020] As an optional solution of the above-mentioned safety lifting chair, a through hole is opened on the above-mentioned outer layer, and the above-mentioned through hole is connected with the above-mentioned hollow layer.

[0021] The beneficial effects of the present invention are:

[0022] The safety lifting chair comprises a base, a support column, a seat cushion, an adjustment column and an adjustment mechanism. The support column is arranged on the base, the adjustment column is arranged on the seat cushion, the support column is provided with an installation cavity along the vertical direction, the adjustment column can be inserted into the installation cavity, and the user can sit stably on the seat cushion. Among them, the adjustment mechanism includes a screw, a worm wheel, a bevel gear, a ratchet and a driving handle, one end of the screw is fixedly connected to the adjustment column, the worm wheel is rotatably arranged on the support column, and the inner shaft of the worm wheel is meshed with the screw, so that the rotation of the worm wheel can drive the screw to move, thereby driving the seat cushion and the adjustment column to move, and at the same time, the bevel gear is rotatably arranged on the support column, the bevel gear is meshed with the worm wheel, so that the rotation of the bevel gear can drive the worm wheel to rotate, further, one end of the driving handle is rotatably arranged on the support column, and the ratchet is rotatably arranged on the driving handle, so that the ratchet can change its position relative to the driving handle to facilitate the use of the ratchet, and the driving handle can drive the ratchet to move the bevel gear so that the adjustment column moves upward in the vertical direction, thereby manually adjusting the height of the seat cushion, and after the ratchet is disengaged from the bevel gear, the user can also manually lower the height of the seat cushion, so that the adjustment mechanism can adjust the specific height of the seat cushion to meet the needs of the user. The safety lifting chair can adjust the height of the seat cushion without using a cylinder, thereby avoiding the direct harm to personal safety caused by the explosion of the cylinder, thereby improving the safety performance of the lifting chair. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a safety lifting chair provided by an embodiment of the present invention;

[0024] Figure 2 A cross-sectional view of a safety lifting chair provided by an embodiment of the present invention;

[0025] Figure 3 This is a local enlarged view of point A in 2.

[0026] In the figure:

[0027] 1. Base; 2. Support column; 21. Installation cavity; 22. Support ring plate; 221. Matching groove; 2211. Slide groove; 3. Cushion; 31. Support plate; 32. Hollow layer; 33. Plastic layer; 34. Outer layer; 341. Through hole; 4. Adjustment column; 41. Second upper inclined block; 5. Adjustment mechanism; 51. Screw; 52. Worm gear; 53. Bevel gear; 54. Ratchet; 55. Drive handle; 551. Half gear; 56. First elastic member; 6. Auxiliary support mechanism; 61. Drive plate; 611. First lower inclined block; 612. Rack; 62. Adjustment support frame; 621. First upper inclined block; 622. Second lower inclined block; 6221. Slider; 63. Second elastic member. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] Embodiment 1

[0033] The present embodiment provides a safe lifting chair, which has high safety performance and can avoid potential safety hazards during the adjustment process of the lifting chair.

[0034] like Figure 1 to Figure 3 As shown, the safety lifting chair includes a base 1, a support column 2, a seat cushion 3, an adjustment column 4 and an adjustment mechanism 5. The support column 2 is arranged on the base 1, and the adjustment column 4 is arranged on the seat cushion 3. The support column 2 is provided with an installation cavity 21 in the vertical direction, and the adjustment column 4 can be inserted into the installation cavity 21, so that the user can sit stably on the seat cushion 3. Specifically, the seat cushion 3 includes a support plate 31, a hollow layer 32, a plastic layer 33 and an outer layer 34. The adjustment column 4 is fixedly connected to the support plate 31, and the support plate 31 is provided with a hollow layer 32, and the hollow layer 32 is provided with a plastic layer 33. The support plate 31 can support the seat cushion 3 to prevent the seat cushion 3 from deformation. The use of the hollow layer 32 and the plastic layer 33 can improve the comfort of the seat cushion 3 and improve the user experience. The outer layer 34 is wrapped around the support plate 31, the hollow layer 32 and the plastic layer 33 to protect the support plate 31, the hollow layer 32 and the plastic layer 33. Optionally, a through hole 341 is opened on the outer layer 34 , and the through hole 341 is connected to the hollow layer 32 , so as to ensure air circulation inside the seat cushion 3 , thereby preventing pressure from being generated and ensuring the safety of the seat cushion 3 in use.

[0035] The adjusting mechanism 5 includes a screw rod 51, a worm wheel 52, a bevel gear 53, a pawl 54 and a driving handle 55. One end of the screw rod 51 is fixedly connected to the adjusting column 4. The worm wheel 52 is rotatably arranged on the support column 2, and the inner shaft of the worm wheel 52 is meshedly connected to the screw rod 51, so that the rotation of the worm wheel 52 can drive the screw rod 51 to move, thereby driving the seat cushion 3 and the adjusting column 4 to move. At the same time, the bevel gear 53 is rotatably arranged on the support column 2, and the bevel gear 53 is meshedly connected to the worm wheel 52, so that the rotation of the bevel gear 53 can drive the worm wheel 52 to rotate, and further, the driving One end of the movable handle 55 is rotatably disposed on the support column 2, and the pawl 54 is rotatably disposed on the driving handle 55, so that the pawl 54 can change its position relative to the driving handle 55 to facilitate the use of the pawl 54, and the driving handle 55 can drive the pawl 54 to shift the bevel gear 53, so that the adjustment column 4 moves upward in the vertical direction, thereby manually adjusting the height of the seat cushion 3, and after the pawl 54 is disengaged from the bevel gear 53, the user can also manually lower the height of the seat cushion 3, so that the adjustment mechanism 5 can adjust the specific height of the seat cushion 3 to meet the needs of the user. The safety lifting chair can adjust the height of the seat cushion 3 without using a cylinder, thereby avoiding the direct harm to personal safety caused by the explosion of the cylinder, thereby improving the safety performance of the lifting chair.

[0036] Furthermore, the adjustment mechanism 5 further includes a first elastic member 56, the two ends of which are respectively connected to the driving handle 55 and the pawl 54, and are used to drive the pawl 54 to reset, so that after each rotation of the driving handle 55, the angle formed between the pawl 54 and the driving handle 55 can be restored to a predetermined angle, so as to facilitate the multiple use of the pawl 54 and the bevel gear 53. Specifically, the user can increase the height of the seat cushion 3 by pressing the driving handle 55 downward multiple times.

[0037] Embodiment 2

[0038] This embodiment also provides a safe lifting chair, which also has high safety performance and can avoid potential safety hazards during the adjustment process of the lifting chair.

[0039] The safety lifting chair provided in this embodiment is basically the same as the safety lifting chair in the first embodiment. Figure 2 and Figure 3As shown, the safety lifting chair also includes an auxiliary support mechanism 6, which includes a driving plate 61, an adjustment support frame 62 and a second elastic member 63. The driving plate 61 is slidably sleeved on the screw rod 51, so that the driving plate 61 can slide along the extension direction of the screw rod 51, and the two ends of the second elastic member 63 are respectively connected to the inner wall of the installation cavity 21 and the adjustment support frame 62, and the second elastic member 63 always has a tendency to move the adjustment support frame 62 away from the inner wall of the installation cavity 21 in the horizontal direction, so that the adjustment column 4 can abut against the adjustment support frame 62 in the vertical direction, so that the adjustment support frame 62 can support the adjustment column 4, thereby improving the bearing capacity of the seat cushion 3. Optionally, the adjustment support frame 62 is slidably arranged on the support column 2 in the horizontal direction.

[0040] At the same time, the driving handle 55 can drive the driving plate 61 to squeeze the adjustment support frame 62, so that the adjustment support frame 62 moves in the horizontal direction toward the inner wall of the installation cavity 21, so that the adjustment column 4 can be separated from the adjustment support frame 62, thereby facilitating the lowering of the height of the seat cushion 3. Among them, the end of the driving plate 61 is provided with a first lower inclined block 611, and the side wall of the adjustment support frame 62 is protrudingly provided with a first upper inclined block 621, the lower inclined surface of the first lower inclined block 611 can abut against the upper inclined surface of the first upper inclined block 621, and the driving handle 55 can drive the driving plate 61 to move downward in the vertical direction, so that the first lower inclined block 611 can squeeze the first upper inclined block 621, thereby realizing the adjustment support frame 62 moving in the horizontal direction toward the inner wall of the installation cavity 21. Specifically, a rack 612 is provided on the driving plate 61, and the rack 612 is extended in the vertical direction. A half gear 551 is provided at one end of the driving handle 55, and the half gear 551 can engage with the rack 612, so that when the driving handle 55 is pulled upward, the driving plate 61 can be moved downward in the vertical direction.

[0041] Further, a second lower inclined block 622 is protrudingly provided on the side wall of the adjustment support frame 62, and a second upper inclined block 41 is protrudingly provided on the side wall of the adjustment column 4. When the adjustment column 4 moves downward in the vertical direction, the upper end of the second lower inclined block 622 can abut against the lower end of the second upper inclined block 41, so that the adjustment support frame 62 can support the adjustment column 4; when the adjustment column 4 moves upward in the vertical direction, the lower inclined surface of the second lower inclined block 622 can abut against the upper inclined surface of the second upper inclined block 41, so that the second upper inclined block 41 can squeeze the second lower inclined block 622, so that the second lower inclined block 622 can be separated from the second upper inclined block 41 in the horizontal direction, thereby realizing the continuous upward movement of the adjustment column 4 in the vertical direction. Specifically, by pressing the driving handle 55 downward for many times, the adjustment mechanism 5 can drive the seat cushion 3 to continuously move upward.

[0042] Furthermore, a support ring plate 22 is provided on the support column 2, and the support ring plate 22 is provided between the adjustment column 4 and the adjustment support frame 62. The support ring plate 22 is provided with a matching groove 221, and the second lower inclined block 622 is slidably provided in the matching groove 221 along the horizontal direction, so that when the seat cushion 3 moves upward or downward, the sliding cooperation between the second lower inclined block 622 and the matching groove 221 can ensure that the adjustment support frame 62 will not tilt when it is retracted or ejected, thereby ensuring the normal operation of the safety lift chair. Among them, there are multiple matching grooves 221 and second lower inclined blocks 622, and multiple matching grooves 221 and multiple second lower inclined blocks 622 are arranged at intervals along the vertical direction, and multiple matching grooves 221 and multiple second lower inclined blocks 622 are arranged one by one, so that the second upper inclined block 41 abuts against any second lower inclined block 622, which can ensure the bearing capacity of the seat cushion 3 at different heights. Optionally, a slide groove 2211 is opened in the matching groove 221 along the horizontal direction, and a slider 6221 is protruded from the second lower inclined block 622. The slider 6221 is slidably arranged in the slide groove 2211 to further improve the stability of the second lower inclined block 622 moving in the matching groove 221.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A safety lifting chair, characterized in that: include: Base (1); A support column (2), the support column (2) being arranged on the base (1), and the support column (2) being provided with a mounting cavity (21) along a vertical direction; A seat cushion (3) and an adjustment column (4), wherein the adjustment column (4) is arranged on the seat cushion (3), and the adjustment column (4) can be inserted into the installation cavity (21); An adjusting mechanism (5), the adjusting mechanism (5) comprising a screw (51), a worm wheel (52), a bevel gear (53), a ratchet (54) and a driving handle (55), one end of the screw (51) being fixedly connected to the adjusting column (4); the worm wheel (52) being rotatably arranged on the supporting column (2), the inner shaft of the worm wheel (52) being meshingly connected to the screw (51); the bevel gear (53) being rotatably arranged on the supporting column (2), the bevel gear (53) being meshingly connected to the worm wheel (52); one end of the driving handle (55) being rotatably arranged on the supporting column (2), the ratchet (54) being rotatably arranged on the driving handle (55); the driving handle (55) being capable of driving the ratchet (54) to shift the bevel gear (53) so that the adjusting column (4) moves upward along the vertical direction; The adjustment mechanism (5) further comprises a first elastic member (56), two ends of which are respectively connected to the driving handle (55) and the ratchet (54), and are used to drive the ratchet (54) to reset; The safety lifting chair also includes an auxiliary support mechanism (6), the auxiliary support mechanism (6) includes a driving plate (61), an adjustment support frame (62) and a second elastic member (63), the driving plate (61) is slidably sleeved on the screw rod (51), and the two ends of the second elastic member (63) are respectively connected to the inner wall of the installation cavity (21) and the adjustment support frame (62); the second elastic member (63) always has a movement tendency of making the adjustment support frame (62) move away from the inner wall of the installation cavity (21) in the horizontal direction, so that the adjustment column (4) can abut against the adjustment support frame (62) in the vertical direction; the driving handle (55) can drive the driving plate (61) to squeeze the adjustment support frame (62), so that the adjustment support frame (62) moves in the horizontal direction toward the inner wall of the installation cavity (21); A first lower inclined block (611) is provided at the end of the driving plate (61), and a first upper inclined block (621) is protrudingly provided on the side wall of the adjusting support frame (62), and the lower inclined surface of the first lower inclined block (611) can abut against the upper inclined surface of the first upper inclined block (621); the driving handle (55) can drive the driving plate (61) to move downward along the vertical direction; The driving plate (61) is provided with a rack (612), and the rack (612) is extended along the vertical direction; one end of the driving handle (55) is provided with a half gear (551), and the half gear (551) can mesh with the rack (612); A second lower inclined block (622) is protrudingly provided on the side wall of the adjustment support frame (62), and a second upper inclined block (41) is protrudingly provided on the side wall of the adjustment column (4); when the adjustment column (4) moves downward along the vertical direction, the upper end of the second lower inclined block (622) can abut against the lower end of the second upper inclined block (41); when the adjustment column (4) moves upward along the vertical direction, the lower inclined surface of the second lower inclined block (622) can abut against the upper inclined surface of the second upper inclined block (41).

2. The safety lifting chair according to claim 1, characterized in that: The support column (2) is provided with a support ring plate (22), and the support ring plate (22) is arranged between the adjustment column (4) and the adjustment support frame (62); the support ring plate (22) is provided with a matching groove (221), and the second lower inclined block (622) is slidably arranged in the matching groove (221) along the horizontal direction.

3. The safety lifting chair according to claim 2, characterized in that: The matching grooves (221) and the second lower inclined blocks (622) are both provided in plurality, and the matching grooves (221) and the second lower inclined blocks (622) are both arranged at intervals along the vertical direction; the matching grooves (221) and the second lower inclined blocks (622) are arranged in one-to-one correspondence.

4. The safety lifting chair according to claim 1, characterized in that: The seat cushion (3) comprises a support plate (31), a hollow layer (32), a plastic layer (33) and an outer covering layer (34); the adjustment column (4) is fixedly connected to the support plate (31); the hollow layer (32) is provided on the support plate (31), and the plastic layer (33) is provided on the hollow layer (32); the outer covering layer (34) is wrapped around the support plate (31), the hollow layer (32) and the plastic layer (33).

5. The safety lifting chair according to claim 4, characterized in that: The outer covering layer (34) is provided with a through hole (341), and the through hole (341) is connected to the hollow layer (32).

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