TWI725540B - chair - Google Patents

Abstract

A chair includes a base column unit, a chair cushion unit, a chair back unit, and an adjustment unit. The chair cushion unit is connected to the base column unit. The seat back unit is arranged above the seat cushion unit. The adjustment unit includes a base module connected to the base column unit, and a connection module that can rotate around a first axis and is connected to the base module in a positional manner. The seat back unit is rotatably connected to one end of the connecting module opposite to the base module in a positionally connected manner. The connecting module can rotate about the first axis relative to the base module so that the seat back unit moves relative to the base column unit along a first axial direction between an approaching position and a distant position, so it can Adjust the distance from the front edge of the seat cushion unit to the seat back unit, and then rotate the seat back unit relative to the connection module by adjusting, so that the seat back unit can be adjusted to a suitable angle for abutment, so it can provide different People with stature ride.

Description

chair

The present invention relates to a chair, in particular to a chair capable of adjusting the distance from the front edge of the cushion to the back of the chair.

The height and weight of developing children increase rapidly. According to the open platform of government information, the average height of six-year-old school children in Taiwan is 116.7 cm, the average height of twelve-year-old school children is 151.5 cm, and the growth rate is 29.8%; The average weight of school children is 21.8 kg, the average weight of twelve-year-old school children is 46.1 kg, and the growth rate is as high as 111.5%, indicating that the body shape of developing children has changed considerably.

Therefore, six-year-old and twelve-year-old children have different requirements for the size of the chair. As far as the distance from the front edge of the seat cushion to the back of the chair is concerned, six-year-old children need a smaller distance due to their smaller body size, while twelve-year-old students need a larger distance due to their larger body size. However, a general chair can only adjust the height of the cushion relative to the ground, but cannot adjust the distance from the front edge of the cushion to the back of the chair, so it cannot be suitable for students of different ages. In this regard, ordinary parents tend to purchase chairs of different sizes during the growth of the schoolchildren according to the size of the schoolchildren, and the used chairs are usually too small because they can only be discarded, which causes waste.

Therefore, the object of the present invention is to provide a chair that can seat users of different body shapes.

Therefore, the chair of the present invention includes a base column unit, a cushion unit, a backrest unit, and an adjustment unit.

The chair cushion unit is connected to the base column unit. The seat back unit is arranged above the seat cushion unit. The adjustment unit includes a base module connected to the base column unit, and a connection module that can rotate around a first axis and is connected to the base module in a positional manner. The seat back unit is rotatable around a second axis parallel to the first axis and is positioned and connected to the end of the connecting module opposite to the base module. The connecting module can rotate about the first axis relative to the base module to make the seat back unit move between an approaching position and a distant position relative to the base column unit along a first axis. In the approaching position, the seat back unit is relatively adjacent to the base column unit. In the remote position, the seat back unit is relatively far away from the base column unit.

The effect of the present invention is that by providing the connection module, when the connection module rotates relative to the base module, it can drive the chair back unit to approach the base column unit along the first axis. The distance between the position and the remote position can be adjusted so that the distance between the front edge of the cushion unit and the back unit can be adjusted, and the back unit can be adjusted to the back unit by adjusting the rotation of the back unit relative to the connection module. It is suitable for the angle of leaning, so it can be used by users of different body shapes.

Referring to FIGS. 1, 2, and 3, an embodiment of the chair of the present invention includes a base column unit 2, a cushion unit 3, a backrest unit 4, an adjustment unit 5, and a positioning unit 6.

A first axis X, a second axis Y perpendicular to the first axis X, and a third axis Z perpendicular to the first axis X and the second axis Y are defined.

The pillar unit 2 includes a pillar 21 extending upward, and a sliding seat 22 that is connected to the pillar 21 and can be operated to move up and down along the pillar 21 to generate positioning.

The cushion unit 3 is connected to the pillar 21.

The seat back unit 4 is arranged above the seat cushion unit 3.

The adjustment unit 5 includes a base module 51 that is connected to the sliding base 22 and can be driven by the sliding base 22 to move up and down along the pillar 21 to generate positioning, and a base module 51 that can rotate around a first axis L1 to generate positioning The ground is connected to the connection module 9 of the base module 51.

Referring to Figures 2, 3, and 4, the seat back unit 4 is rotatable about a second axis L2 parallel to the first axis L1 and is positioned to be connected to the connecting module 9 opposite to the base module 51. .

The base module 51 has a first joint plate 7 and a second joint plate 8 spaced apart along the first axis L1. The connection module 9 is located between the first joint plate 7 and the second joint plate 8.

The first joint plate 7 has a first base 71, a first perforation 72 penetrating the first base 71 along the first axis L1, and a first hole 72 that can rotate about the first axis L1 and can move along the first axis L1 An adjusting portion 73 extending from the first through hole 72, a holding portion 74 exposed outside the first base 71 and connected to the adjusting portion 73 and capable of driving the adjusting portion 73 to rotate around the first axis L1, and A pivot groove 75 recessed on the side of the adjusting portion 73 corresponding to the connecting module 9 and extending along the first axis L1. In this embodiment, the first base 71 is made of plastic material.

Referring to FIGS. 2, 5, and 6, the first through hole 72 has a small aperture area 721 adjacent to the connection module 9 and a large aperture area 722 opposite to the small aperture area 721 and larger than the small aperture area 721. And a connecting area 723 connecting the small aperture area 721 and the large aperture area 722.

The first base 71 has an abutting area 711 defining the connecting area 723 and a surrounding area 712 surrounding the large aperture area 722. The surrounding area 712 is formed with an internal thread 713.

An external thread 732 corresponding to the internal thread 713 is formed on the outer peripheral surface of the adjustment portion 73.

Referring to Figures 2, 3, and 4, the connection module 9 has a base 91, a first pivot 92 and a second pivot 92 passing through the base 91 along the first axis L1 and the second axis L2, respectively. The pivot 93, a first groove 94 and a second groove 95 formed on the base member 91 and respectively around the first axis L1 and the second axis L2, can respectively surround the first axis L1 and the second axis L2. A first rotating shaft 96 and a second rotating shaft 97, a first rotating shaft 96 and a second rotating shaft 97, which are pivotally connected to the first rotating shaft 96, respectively slidably pass through the first groove 94 and the second groove 95, with two axes L2 rotating The connecting rod 98 between and the second rotating shaft 97 is formed on the base member 91 and corresponds to the first groove 94 and the second groove 95, respectively, and is provided for the first rotating shaft 96 and the second groove 95, respectively. A first guide groove 99 and a second guide groove 90 are slidably disposed on the rotating shaft 97.

The base member 91 has a first plate portion 911, a second plate portion 912 spaced apart from the first plate portion 911 along the second axial direction Y, and connects the first plate portion 911 and the second plate portion 912 between the surrounding plate portion 913. The first plate portion 911, the second plate portion 912 and the surrounding plate portion 913 cooperate to define a chamber 914 for the connecting rod 98 to extend. The first groove 94 and the second groove 95 are formed on the first plate portion 911 and communicate with the chamber 914. The first guiding groove 99 and the second guiding groove 90 are formed on the second plate portion 912 and communicate with the chamber 914.

The first plate portion 911 has a first end surface 915 opposite to the first joining plate 7.

The first pivot shaft 92 passes through the first plate portion 911 and the second plate portion 912 of the base member 91, and has two ends respectively exposed outside the base member 91 and pivots along the first axis L1 Connected to the first pivot portion 921 of the base module 51. One of the first pivotal portions 921 adjacent to the first joint plate 7 is extended in the pivot groove 75.

The second pivot 93 passes through the first plate portion 911 and the second plate portion 912 of the base member 91, and has two ends respectively exposed outside the base member 91 and provided for the seat back unit 4 The second pivotal portion 931 pivotally connected to the second axis L2.

The first rotating shaft 96 passes through the first groove 94 and the first guide groove 99 of the base 91, and has two ends respectively exposed outside the base 91 and capable of circling the first axis. L1 is rotatably connected to the first rotating part 961 of the base module 51.

The second rotating shaft 97 passes through the second groove 95 of the base member 91 and the second guide groove 90, and has two ends respectively exposed outside the base member 91 and capable of circling the second axis. L2 is rotatably connected to the second rotating part 971 of the base module 51. In this embodiment, the first rotating parts 961 and the second rotating parts 971 can rotate synchronously and respectively around the first axis L1 and the second axis L2.

The first groove 94 is arc-shaped and has a first proximal end 941 relatively adjacent to the base column unit 2 and a second proximal end 941 opposite to the first proximal end 941 and relatively far away from the base column unit 2 One away from the end 942.

The second groove 95 is arc-shaped and has a second proximal end 951 relatively adjacent to the base column unit 2 and a second proximal end 951 opposite to the second proximal end 951 and relatively far away from the base column unit 2 Away from the end 952.

The first pivotal portions 921 and the second pivotal portions 931 are axially disposed on the base member 91. Each first pivot portion 921, the respective first pivot portion 961, the respective second pivot portion 971, and the respective second pivot portion 931 jointly form a four-bar linkage mechanism, and each first pivot portion 961 and The distance between the respective second rotating parts 971 is constant.

4, 7, 8, the connection module 9 can rotate about the first axis L1 relative to the base module 51 so that the seat back unit 4 relative to the base column unit 2 along the first axis X Move between an approaching position (see Figure 7) and a distant location (see Figure 8). In the approaching position, the seat back unit 4 is relatively adjacent to the base column unit 2, the first rotating shaft 96 is located at the first approaching end 941 (see the solid line position in FIG. 4), and the second rotating shaft 97 Located at the second approaching end 951 (see the solid line position in Figure 4). In the remote position, the seat back unit 4 is relatively far away from the base column unit 2, the first rotating shaft 96 is located at the first remote end 942 (see the imaginary line position in FIG. 4), and the second rotating shaft 97 is located at the The second remote end 952 (see the imaginary line position in Figure 4).

Referring to Figures 2, 5, and 6, the positioning unit 6 includes an inserting portion 61 arranged on the first end surface 915 and surrounding the first axis L1, and an inserting portion 61 arranged on the first joining plate 7 and interlocking with the insert The portion 61 is a locking portion 62 with complementary concave and convex. In this embodiment, the clamping portion 62 is made of plastic material.

The clamping portion 62 can be operated to move between a positioning position (see FIG. 5) and a disengagement position (see FIG. 6) relative to the inserting portion 61 along the first axis L1. In the positioning position, the The locking portion 62 approaches the first end surface 915 and contacts the inserting portion 61, and in the disengaged position, the locking portion 62 is relatively far away from the inserting portion 61.

The following first outlines the use of the chair, and then describes in detail the actions and operating principles of each component during use.

When the user wants to adjust the position of the seat back unit 4 relative to the base column unit 2 along the first axis X, the user must first operate to make the locking portion 62 relative to the inserting portion 61 along the first axis L1 In the disengaged position, the connecting module 9 can rotate relative to the first joint plate 7 about the first axis L1, thereby driving the seat back unit 4 to move relative to the base column unit 2 along the first axis X . When the seat back unit 4 reaches the predetermined position, the locking portion 62 is then operated to be at the positioning position relative to the inserting portion 61 along the first axis L1, so that the connecting module 9 can be positioned relative to the first axis L1. A joint plate 7 is non-rotatably positioned so that the seat back unit 4 is positioned relative to the base column unit 2 along the first axis X.

Next, the following describes in detail the actions of the components when the locking portion 62 moves relative to the inserting portion 61 along the first axis L1, so as to further explain that the connecting module 9 can be relative to the first joint plate 7. Rotate around the first axis L1 or generate positioning action principle.

When the user wants to fix the connecting module 9 relative to the first joint plate 7 to be non-rotatably positioned, it is necessary to apply force to the holding portion 74 to drive the adjusting portion 73 to rotate around the first axis L1, by The engagement of the internal thread 713 and the external thread 732 causes the adjustment portion 73 to move along the first axis L1 toward the connection module 9. During the aforementioned movement, the adjusting portion 73 can be pressed against the abutting area 711 and the clamping portion 62. Since the first base portion 71 and the clamping portion 62 are made of plastic materials, the adjustment portion When 73 is pressed, it will be elastically deformed and move toward the connection module 9 to reach the positioning position (see FIG. 6). In the positioning position, the locking portion 62 contacts and presses the inserting portion 61 to generate frictional resistance, so that the connecting module 9 can be positioned non-rotatably relative to the first joining plate 7.

When the user wants to enable the connecting module 9 to rotate about the first axis L1 with respect to the first joint plate 7, it is necessary to apply force to the grip portion 74 to drive the adjusting portion 73 around the first axis. The rotation of L1 causes the adjusting portion 73 to move away from the connecting module 9 along the first axis L1 by loosening the engagement between the internal thread 713 and the external thread 732. As the adjusting portion 73 gradually moves away from the abutting area 711, the abutting area 711 and the locking portion 62 will use the material properties of the first joining plate 7 and the locking portion 62 to return to their original shape to gradually Move away from the inserting portion 61 and reach the disengaged position (see FIG. 5). In the disengaged position, the locking portion 62 is relatively far away and no longer tightens the inserting portion 61, so the connecting module 9 can rotate about the first axis L1 relative to the first engaging plate 7.

Referring to FIGS. 4, 7, and 8, the following continues to describe the actions and operating principles of each component when the connecting module 9 rotates about the first axis L1 relative to the base module 51.

When the user wants to move the seat back unit 4 from the approaching position shown in FIG. 7 to the distant position shown in FIG. 8, the user needs to operate the connecting module 9 relative to the base module 51 Rotating around the first axis L1 in a counterclockwise direction, so that the seat back unit 4 connected to the end of the connecting module 9 opposite to the base module 51 can be driven to gradually move away from the base column unit 2.

In addition, because the first rotating parts 961 are connected to the base module 51, the relative position between the first rotating shaft 96 and the base module 51 is fixed during the aforementioned rotating process, and the base member The rotation of 91 and the first groove 94 will cause the first rotating shaft 96 to slide from the first approaching end 941 (see the solid line position in FIG. 4) to the first away end 942 (see the imaginary line in FIG. 4). Position), and because the connecting rod 98 is pivotally connected between the first rotating shaft 96 and the second rotating shaft 97, it will synchronously drive the second rotating shaft 97 to rotate around the second axis L2 and be driven by the second axis L2. The second approaching end 951 (see the solid line position in FIG. 4) slides to the second far end 952 (see the imaginary line position in FIG. 4), and the seat back unit 4 is connected to the second rotating parts 971 and pivoted Connected to the second pivot portions 931, so the seat back unit 4 is driven by the second rotation shaft 97 to rotate relative to the connecting module 9, so that the seat back unit 4 can be maintained at an angle suitable for abutment .

During the above-mentioned rotation and movement, the height of the seat back unit 4 relative to the seat cushion unit 3 along the third axis Z will also change accordingly. For this, the base can be driven by operating the sliding seat 22 The module 51 moves up and down along the pillar 21 and is positioned so as to adjust the seat back unit 4 to a suitable height.

In this way, when the connecting module 9 rotates relative to the base module 51, the seat back unit 4 is driven relative to the base column unit 2 along the first axial direction X at the approaching position and the distance By moving between positions, the distance between the front edge of the seat cushion unit 3 and the seat back unit 4 can be adjusted, and the seat back unit 4 can be maintained at a suitable angle during the movement for different body shapes. Ride.

It should be particularly noted that, in this embodiment, when the connecting module 9 rotates relative to the base module 51 about the first axis L1, the first rotating parts 961 will drive the second rotating parts. The part 971 rotates around the second axis L2 to drive the seat back unit 4 to rotate relative to the connection module 9 around the second axis L2. However, in other embodiments, the first rotating parts 961 are also The second rotating parts 971 may not be driven to rotate around the second axis L2, as long as the seat back unit 4 is pivotally connected to the connecting module 9 and can be operated to adjust the seat back unit 4 relative to the connecting module The angle of 9 can also achieve the same effect.

It is worth mentioning that in this embodiment, the base 91, the first groove 94, the second groove 95 and the connecting rod 98 are used to make each first pivotal portion 921 and its respective The first rotating portion 961, the respective second rotating portion 971, and the respective second pivoting portion 931 together constitute the four-bar linkage mechanism, and each first rotating portion 961 and the respective second rotating portion 971 The distance is fixed. However, in other embodiments, the connection module 9 can also form the four-bar linkage mechanism by other components and other combinations to achieve the same purpose.

It should be particularly noted that in this embodiment, the clamping portion 62 is operated to press the clamping portion 61 so that the connecting module 9 can be positioned non-rotatably relative to the first joint plate 7. However, in other embodiments, the clamping portion 62 and the inserting portion 61 can also be designed to be interlocked with each other, so as long as the clamping portion 62 contacts the inserting portion 61, it can also achieve Same purpose.

In addition, in this embodiment, the locking portion 62 of the positioning unit 6 is disposed on the first base 71, and the first base 71 and the locking portion 62 are made of plastic material, so the first base 71 and the locking portion 62 will be elastically deformed when pressed by the adjusting portion 73 to tighten the inserting portion 61. However, in other embodiments, the locking portion 62 may also be provided on the adjusting portion 73, and the first base 71 and the clamping portion 62 can be made of non-plastic materials, as long as the adjustment portion 73 can be operated to move away from or toward the connection module 9 along the first axis L, so that the clamping The controlling part 62 is away from or in contact with the inserting part 61, and the same purpose can also be achieved.

In summary, when the connecting module 9 rotates relative to the base module 51, the seat back unit 4 is driven relative to the base column unit 2 along the first axis X at the approaching position and the Move away from the position to adjust the distance between the front edge of the seat cushion unit 3 and the seat back unit 4, and then adjust the seat back unit 4 by rotating the seat back unit 4 relative to the connection module 9 It is suitable for the angle of leaning, so it can be used by users of different body shapes to ride, so the purpose of the invention can be achieved.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope covered by the patent of the present invention.

2········ Foundation Column Unit 21······· Pillar 22······· Sliding seat 3········Chair Cushion Unit 4········ Backrest Unit 5········ Adjustment Unit 51······· Base Module 6········ Positioning unit 61······· Card Insertion Department 62······· Card System Department 7········ The first joint plate 71·······The first base 711····· Arrival area 712····· Surrounding Area 713····· Internal thread 72·······The first piercing 721····· Small aperture area 722·····Large Aperture Area 723····· Connection Zone 73·······Adjustment Department 732····· External thread 74······· Grip 75·······Pivot Slot 8········Second Joint Plate 9········ Connection Module 90·······Second guide groove 91·······Baseware To To 911····· First Board Department 912·····Second Board Department 913····· Surrounding Board 914····· Room 915·····The first end face 92·······The First Pivot 921·····The first pivot 93·······Second Pivot 931·····Second pivot 94······· First Groove 941····· First Approaching End 942····· The first far end 95······· Second Groove 951····· Second Approaching End 952·····The second far end 96······· The first rotation axis 961·····The first rotating part 97·······Second Rotation Axis 971····· The second rotating part 98······· Connecting rod 99······· The first guide slot L1······· First axis L2······· Second axis X········ First axis Y········ Second axis Z········ Third axis

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a three-dimensional assembly view of an embodiment of the chair of the present invention; Figure 2 is a three-dimensional exploded view of the embodiment; Figure 3 is a perspective exploded view of the embodiment viewed from another angle; 4 is a schematic diagram of a right side view of a connection module of the embodiment; Fig. 5 is a cross-sectional view taken along the line V-V of Fig. 1, illustrating a disengagement position of a clamping part relative to a clamping part; Fig. 6 is a view similar to Fig. 5, illustrating a positioning position of the clamping portion relative to the inserting portion; FIG. 7 is a right side view of the embodiment, illustrating a seat back unit at a distance from a base column unit along a first axis; and FIG. 8 is a view similar to FIG. 7, illustrating that the seat back unit is at an approaching position relative to the base column unit along the first axis.

2········ Foundation Column Unit 21······· Pillar 22······· Sliding seat 3········Chair Cushion Unit 4········ Backrest Unit 5········ Adjustment Unit 51······· Base Module 7········ The first joint plate 71·······The first base 9········ Connection Module 91·······Baseware 94······· First Groove 941····· First Approaching End 95······· Second Groove 951····· Second Approaching End X········ First axis Z········ Third axis

Claims (10)

A chair comprising: a base column unit; a chair cushion unit connected to the base column unit; a chair back unit arranged above the chair cushion unit; and an adjustment unit including a base column unit connected to the base column unit The base module, and a connecting module that can rotate around a first axis and is connected to the base module in a positional manner, the seat back unit can rotate around a second axis parallel to the first axis and produce Positionally connected to the end of the connecting module opposite to the base module, the connecting module can rotate about the first axis relative to the base module so that the seat back unit moves along a line relative to the base column unit The first axis moves between an approaching position and a distant position. In the approaching position, the seat back unit is relatively adjacent to the base column unit, and in the distant position, the seat back unit is relatively far away from the base column unit . The chair according to claim 1, wherein the connecting module of the adjusting unit is formed with a first pivotal portion pivotally connected to the base module along the first axis, and a first pivotal portion for the seat back unit along the first axis. A second pivoting portion pivotally connected to two axes, and a first rotating portion and a first rotating portion that are respectively connected to the base module and the seat back unit and capable of rotating synchronously and respectively around the first axis and the second axis Two rotating parts. When the connecting module rotates around the first axis relative to the base module, the first rotating part drives the second rotating part to rotate around the second axis to drive the seat back unit to rotate around the second axis. The second axis rotates relative to the connecting module. The chair according to claim 2, wherein the first pivot of the adjustment unit Part, the first rotating part, the second rotating part, and the second pivoting part together constitute a four-bar linkage mechanism, and the distance between the first rotating part and the second rotating part is fixed. The chair according to claim 3, wherein the connecting module of the adjusting unit has a base member, a first pivot and a first pivot penetrating the base member along the first axis and the second axis, respectively Two pivots, a first groove and a second groove formed on the base member and around the first axis and the second axis, respectively, can rotate around the first axis and the second axis, and can respectively A first rotating shaft and a second rotating shaft slidably passing through the first groove and the second groove, and a connecting rod pivotally connected between the first rotating shaft and the second rotating shaft , The first pivot portion and the second pivot portion are axially disposed on the base member, the first pivot has the first pivot portion exposed to the outside of the base member, and the second pivot has the The second pivoting portion outside the base member, the first rotation shaft has the first rotation portion exposed to the outside of the base member, and the second rotation shaft has the second rotation portion exposed to the outside of the base member. The chair according to claim 4, wherein the first groove of the adjusting unit is arc-shaped and has a first approaching end relatively adjacent to the base column unit, and a first approaching end opposite to the first approaching end End and relatively far away from the first distal end of the base column unit, when the seat back unit is at the approaching position, the first rotation axis is located at the first approaching end, and when the chair back unit is at the far away position, the first rotation axis is located at the first approaching end; A rotating shaft is located at the first remote end. The chair according to claim 4, wherein the second groove of the adjusting unit is arc-shaped and has a second proximal end relatively adjacent to the base column unit, and opposite to the second proximal end And relatively far away from the second At the far end, when the seat back unit is at the approaching position, the second rotation axis is located at the second approaching end, and when the chair back unit is at the far position, the second rotation axis is located at the second far end. The chair according to claim 4, wherein the base member of the adjustment unit has a first plate portion, and a second plate portion spaced apart from the first plate portion along a second axis perpendicular to the first axis. The plate portion, and the surrounding plate portion connecting the first plate portion and the second plate portion, the first plate portion, the second plate portion and the surrounding plate portion cooperate to define a connecting rod for extending The first groove and the second groove are formed on the first plate portion and communicate with the container. The chair according to claim 7, wherein the connection module of the adjustment unit further has a first guide groove and a second guide groove, and the first guide groove and the second guide groove are formed The second plate portion corresponds to the first groove and the second groove respectively, and is provided for the first rotating shaft and the second rotating shaft to be slidably arranged. The chair according to claim 7, wherein the base module of the adjustment unit has a first joint plate and a second joint plate spaced apart along the first axis, and the first plate portion has a On the first end surface of the first joint plate, the chair further includes a positioning unit, the positioning unit including an embedding portion disposed on the first end surface and surrounding the first axis, and a first joint plate And the embedding part presents a concave-convex complementary locking part, the locking part can be operated to move between a positioning position and a disengaged position relative to the embedding part along the first axis. In the positioning position, The clamping portion approaches the first end surface and contacts the inserting portion, so that the connecting module is positioned non-rotatably with respect to the first coupling plate. In the disengaged position, the clamping portion The part is relatively far away from the inserting part, and the connection module can rotate about the first axis relative to the first joint plate. The chair according to claim 3, wherein the base pillar unit includes a pillar extending upward, and a pillar that connects the pillar and the base module and can be operated to drive the base module along the pillar Move up and down to produce a positioning sliding seat.

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