阅读说明：本技术 一种车载减震桌椅架 (Vehicle-mounted damping table and chair frame ) 是由 吴仲锋 于 2019-10-07 设计创作，主要内容包括：一种车载减震桌椅架,涉及一种车用桌子椅子,桌椅支腿为四根,在四根桌椅支腿的下端分别设有朝向中部的斜杆,四根斜杆内端间隔等距固定连接在环形板(21)的四周,环形板处于八角形立板(14)的底板(23)上部中心位置,八角形立板的四个等距面分别设有豁口(15),所述四根斜杆中部处于四个豁口中；八角形立板的另外四个面的内面分别固定连接四根拉簧(19)的外端,四根拉簧的内端固定在环形板外部面的两两斜杆之间,在八角形立板的上口设有盖板(13),所述底板固定在车辆的地板上；本发明利用四根拉簧对环形板的控制,获取了桌椅的任意方向减震。(A vehicle-mounted damping desk-chair frame relates to a vehicle desk-chair, four supporting legs of a desk-chair are provided, the lower ends of the four supporting legs of the desk-chair are respectively provided with an oblique rod facing to the middle part, the inner ends of the four oblique rods are fixedly connected to the periphery of an annular plate (21) at equal intervals and at equal intervals, the annular plate is positioned at the central position of the upper part of a bottom plate (23) of an octagonal vertical plate (14), four equal-distance surfaces of the octagonal vertical plate are respectively provided with a notch (15), and the middle parts of the four oblique rods are positioned in the four; the inner surfaces of the other four surfaces of the octagonal vertical plate are respectively fixedly connected with the outer ends of four tension springs (19), the inner ends of the four tension springs are fixed between every two inclined rods on the outer surface of the annular plate, a cover plate (13) is arranged at the upper opening of the octagonal vertical plate, and the bottom plate is fixed on the floor of a vehicle; the invention utilizes four tension springs to control the annular plate, and obtains the damping in any direction of the table and chair.)

1. The utility model provides an on-vehicle shock attenuation desk and chair frame, includes table chair landing leg, down tube, annular slab (21), bottom plate (23), octagonal riser (14), extension spring (19) and apron (13), characterized by: the table and chair supporting legs are four, the lower ends of the four table and chair supporting legs are respectively provided with inclined rods facing the middle part, the inner ends of the four inclined rods are fixedly connected to the periphery of an annular plate (21) at intervals and at equal intervals, the annular plate (21) is positioned at the central position of the upper part of a bottom plate (23) of an octagonal vertical plate (14), four equal-distance surfaces of the octagonal vertical plate (14) are respectively provided with notches (15), and the middle parts of the four inclined rods are positioned in the four notches (15); the inner surfaces of the other four surfaces of the octagonal vertical plate (14) are respectively fixedly connected with the outer ends of four tension springs (19), the inner ends of the four tension springs (19) are fixed between every two inclined rods on the outer surface of the annular plate (21), a cover plate (13) is arranged at the upper opening of the octagonal vertical plate (14), and the bottom plate (23) is fixed on the floor of a vehicle.

2. the vehicle-mounted shock-absorbing desk and chair frame as claimed in claim 1, wherein: the annular plate (21) is of an octagonal structure, four surfaces of the annular plate are fixedly connected with the inner ends of the four inclined rods, and the other four surfaces between two surfaces of the four surfaces of the annular plate (21) are fixedly connected with the inner ends of the four tension springs (19).

3. The vehicle-mounted damping desk and chair frame as claimed in claim 1 or 2, wherein: hooks B (24) are respectively arranged on the other four surfaces of the annular plate (21), and inner end rings (20) at the inner ends of the four tension springs (19) are respectively sleeved on the four hooks B (24) to form fixed connection.

4. The vehicle-mounted shock-absorbing desk and chair frame as claimed in claim 1, wherein: hooks A (17) are respectively arranged on the inner surfaces of the other four surfaces of the octagonal vertical plate (14), and outer end rings (18) respectively arranged at the outer ends of the four tension springs (19) are respectively sleeved on the four hooks A (17) to form fixed connection.

5. The vehicle-mounted shock-absorbing desk and chair frame as claimed in claim 1, wherein: the bottom parts of four gaps (15) of the octagonal vertical plate (14) are respectively provided with a convex strip (12), and the convex strips (12) are used for acquiring the line contact between the lower surfaces of the four inclined rods and the convex strips (12).

6. The vehicle-mounted shock-absorbing desk and chair frame as claimed in claim 1, wherein: annular bulges (22) are arranged at intervals on the outer edge of an annular plate (21) of a bottom plate (23) of the octagonal vertical plate (14), and the annular bulges (22) are used for acquiring line contact between the lower surfaces of the four inclined rods and the bottom plate (23).

7. The vehicle-mounted shock-absorbing desk and chair frame as claimed in claim 1, wherein: the lower surface of the cover plate (13) is provided with a downward protruding strip (26), the shape of the outer edge of the protruding strip (26) is the same as that of the inner surface of the upper opening of the octagonal vertical plate (14), and the protruding strip (26) is clamped on the inner surface of the upper opening of the octagonal vertical plate (14).

8. The vehicle-mounted shock-absorbing desk and chair frame as claimed in claim 1, wherein: a plurality of through holes (25) are formed in the bottom plate (23) and avoid the inclined rods and the tension springs (19), lower screw rods (30) matched with the number of the through holes (25) penetrate through the through holes (25) of the bottom plate (23) respectively and then are connected with screw holes formed in the floor of the vehicle, hexagonal protrusions (29) formed in the upper ends of the lower screw rods (30) are pressed on the upper surface of the bottom plate (23), and elastic rings B (31) are arranged between the lower surface of the hexagonal protrusions (29) and the bottom plate (23); the upper portion face of hexagonal arch (29) is equipped with screw rod (9) on, goes up screw rod (9) and passes on apron (13) and correspond perforation (27) of a plurality of through-holes (25) on bottom plate (23) after, is died by nut (10) lock, be provided with elastic ring A (28) between nut (10) and apron (13).

9. The vehicle-mounted shock absorption desk and chair frame as claimed in any one of claims 1 to 8, wherein: the shock absorption chair frame is applied to a chair on a vehicle, the four inclined rods are divided into two front inclined rods (11) and two rear inclined rods (16), the upper parts of the outer ends of the two front inclined rods (11) are front legs (6) of the chair, the upper parts of the outer ends of the two rear inclined rods (16) are rear legs (5) of the chair, a reinforcing rod (8) is arranged between the rear leg (5) on one side and the front leg (6), the lower part between the rear leg (5) on the other side and the front leg (6) is provided with another reinforcing rod (8), a fixing rod (7) is arranged between the reinforcing rod (8) and the middle part of the other reinforcing rod (8), the upper parts of the two front legs (6) and the two rear legs (5) are seat plates (4), a back frame (3) formed by the two vertical rods is arranged at the upper ends of the two rear legs (5), and a cross rod (1) and a back plate (2) are; a screw hole is arranged at a proper position on the floor of the vehicle, the through hole (25) of the bottom plate (23) corresponds to the screw hole, and the lower screw rods (30) with matched quantity are connected with the screw hole after penetrating through the through hole (25) of the bottom plate (23) and are screwed tightly by utilizing the hexagonal bulge (29); the chair is characterized in that a ring-shaped plate (21) between two rear inclined rods (16) and the inner ends of two front inclined rods (11) of the chair is placed in the middle of an octagonal vertical plate (14), four hooks B (24) of the ring-shaped plate (21) are respectively sleeved by inner end rings (20) of the inner ends of four tension springs (19), then four outer end rings (18) are respectively and sequentially penetrated through outer end rings (18) of the outer ends of the four tension springs (19) by tensile steel rods to enable the four outer end rings (18) to be respectively sleeved on hooks A (17) on the inner surface of the octagonal vertical plate (14), then a cover plate (13) is used for covering the octagonal vertical plate (14), and at the moment, upper screw rods (9) on the upper portions of hexagonal protrusions (29) respectively penetrate through holes (25) of the cover plate (13), and the upper screw rods (9) are locked by.

10. The vehicle-mounted shock absorption desk and chair frame as claimed in any one of claims 1 to 8, wherein: the damping table is applied to a table on a vehicle, the four inclined rods are distributed in a radial mode, four table legs are arranged at the upper parts of the outer ends of the four inclined rods respectively, table tops (32) are arranged at the upper ends of the four table legs, a reinforcing rod (8) is arranged at the lower part between the two table legs on one side, another reinforcing rod (8) is arranged at the lower part between the two table legs on the other side, and a fixing rod (7) is arranged between the reinforcing rod (8) and the middle part of the another reinforcing rod (8); a screw hole is arranged at a proper position on the floor of the vehicle, the through hole (25) of the bottom plate (23) corresponds to the screw hole, and the lower screw rods (30) with matched quantity are connected with the screw hole after penetrating through the through hole (25) of the bottom plate (23) and are screwed tightly by utilizing the hexagonal bulge (29); the table is characterized in that an annular plate (21) between the inner ends of four inclined rods (16) of the table is placed in the middle of an octagonal vertical plate (14), inner end rings (20) at the inner ends of four tension springs (19) are used for respectively sleeving four hooks B (24) of the annular plate (21), then tensile steel rods are respectively and sequentially penetrated into outer end rings (18) at the outer ends of the four tension springs (19) to enable the four outer end rings (18) to be respectively sleeved on hooks A (17) on the inner surface of the octagonal vertical plate (14), then a cover plate (13) is used for covering the octagonal vertical plate (14), at the moment, upper screw rods (9) on the upper portions of hexagonal protrusions (29) respectively penetrate through holes (25) of the cover plate (13), and elastic rings A (28) and nuts (10) are used for locking the upper screw rods (9).

[ technical field ] A method for producing a semiconductor device

the invention relates to a table and chair for a vehicle, in particular to a vehicle-mounted damping table and chair frame.

[ background of the invention ]

On construction operation vehicles of automobiles and trains, a plurality of instruments and precision equipment need to be placed, on food detection vehicles, medicine detection vehicles, wireless signal flow detection vehicles, flow air quality detection vehicles, flow medical vehicles, television relaying vehicles or special military and police vehicles, various equipment needs to be used for working, the equipment fixed on the vehicles has a certain anti-seismic function, but the special vehicles carry some portable instruments and precision equipment, the equipment is placed on a table top, the anti-falling of the equipment is obtained by utilizing the transformation of the table top, but the vibration generated in the vehicle movement has more or less influence on the equipment, especially some mine exploration vehicles, military reconnaissance vehicles and the like which do not run on public roads, and the requirement on the vibration reduction is very high; at present, no vehicle-mounted damping table capable of resolving vibration exists.

[ summary of the invention ]

In order to overcome the defects in the background art, the invention discloses a vehicle-mounted damping desk and chair frame, wherein damping in any direction of a desk and chair is obtained by controlling a ring-shaped plate through four tension springs.

in order to achieve the purpose, the invention adopts the following technical scheme:

A vehicle-mounted damping desk and chair frame comprises four desk and chair supporting legs, oblique rods, annular plates, a bottom plate, octagonal vertical plates, tension springs and a cover plate, wherein the lower ends of the four desk and chair supporting legs are respectively provided with the oblique rods towards the middle part, the inner ends of the four oblique rods are fixedly connected around the annular plates at equal intervals, the annular plates are positioned at the central positions of the upper parts of the bottom plates of the octagonal vertical plates, four equal-distance surfaces of the octagonal vertical plates are respectively provided with notches, and the middle parts of the four oblique rods are positioned in the four notches; the inner surfaces of the other four surfaces of the octagonal vertical plate are respectively fixedly connected with the outer ends of four tension springs, the inner ends of the four tension springs are fixed between every two inclined rods on the outer surface of the annular plate, a cover plate is arranged at the upper opening of the octagonal vertical plate, and the bottom plate is fixed on the floor of a vehicle.

The vehicle-mounted damping desk and chair frame is characterized in that the annular plate is of an octagonal structure, four surfaces of the annular plate are fixedly connected with the inner ends of the four inclined rods, and the other four surfaces between two surfaces of the four surfaces of the annular plate are fixedly connected with the inner ends of the four tension springs.

The other four surfaces of the annular plate are respectively provided with hooks B, and the inner end rings of the inner ends of the four tension springs are respectively sleeved on the four hooks B to form fixed connection.

The inner faces of the other four faces of the octagonal vertical plate are respectively provided with hooks A, and outer end rings arranged at the outer ends of the four tension springs are respectively sleeved on the four hooks A to form fixed connection.

The vehicle-mounted damping table and chair frame is characterized in that the bottom parts of four openings of the octagonal vertical plate are respectively provided with a protruding strip, and the protruding strips are used for acquiring the line contact between the lower surfaces of the four inclined rods and the protruding strips.

The vehicle-mounted damping desk and chair frame is characterized in that annular bulges are arranged at intervals on the outer edges of the annular plates of the octagonal vertical plate bottom plate, and the annular bulges are used for acquiring the line contact between the lower surfaces of the four inclined rods and the bottom plate.

The vehicle-mounted damping desk and chair frame is characterized in that a downward protruding strip is arranged on the lower surface of the cover plate, the shape of the outer edge of the protruding strip is the same as that of the inner surface of the upper opening of the octagonal vertical plate, and the protruding strip is clamped on the inner surface of the upper opening of the octagonal vertical plate.

The vehicle-mounted damping desk and chair frame is characterized in that a plurality of through holes are formed in the bottom plate in a manner of avoiding the inclined rods and the tension springs, lower screw rods matched with the through holes in number respectively penetrate through the through holes of the bottom plate and then are connected with screw holes formed in the floor of a vehicle, hexagonal protrusions arranged at the upper ends of the lower screw rods are pressed on the upper surface of the bottom plate, and elastic rings B are arranged between the lower surfaces of the hexagonal protrusions and the bottom plate; the upper surface of the hexagonal protrusion is provided with an upper screw rod, the upper screw rod is locked by a nut after penetrating through the through holes of the cover plate corresponding to the through holes on the bottom plate, and an elastic ring A is arranged between the nut and the cover plate.

the vehicle-mounted damping desk and chair frame is applied to a chair on a vehicle, the four inclined rods are divided into two front inclined rods and two rear inclined rods, the upper parts of the outer ends of the two front inclined rods are front legs of the chair, the upper parts of the outer ends of the two rear inclined rods are rear legs of the chair, a reinforcing rod is arranged at the lower part between the rear leg and the front leg on one side, another reinforcing rod is arranged at the lower part between the rear leg and the front leg on the other side, a fixing rod is arranged between the reinforcing rod and the middle part of the other reinforcing rod, the upper parts of the two front legs and the two rear legs are seat plates, a back frame formed by the two vertical rods is arranged at the upper ends of the two rear legs, and a transverse rod and a back plate; the proper position on the floor of the vehicle is provided with a screw hole, so that the through hole of the bottom plate corresponds to the screw hole, and the lower screw rods with the matched number penetrate through the through hole of the bottom plate and are connected with the screw hole and screwed down by utilizing the hexagonal bulge; the chair is characterized in that a ring-shaped plate between two rear inclined rods and the inner ends of two front inclined rods of the chair is placed in the middle of an octagonal vertical plate, four hooks B of the ring-shaped plate are sleeved with inner end rings at the inner ends of four tension springs respectively, then tensile steel rods sequentially penetrate through outer end rings at the outer ends of the four tension springs respectively to enable the four outer end rings to be sleeved on hooks A on the inner face of the octagonal vertical plate respectively, then a cover plate is used for covering the octagonal vertical plate, at the moment, upper screw rods on the upper portions of hexagonal protrusions respectively penetrate through holes of the cover plate, and the upper screw rods are locked through elastic rings A.

The vehicle-mounted damping desk and chair frame is applied to a desk on a vehicle, the four inclined rods are distributed in a radial mode, four desk legs are arranged at the upper parts of the outer ends of the four inclined rods respectively, a desktop is arranged at the upper ends of the four desk legs, a reinforcing rod is arranged at the lower part between the two desk legs on one side, another reinforcing rod is arranged at the lower part between the two desk legs on the other side, and a fixing rod is arranged between the reinforcing rod and the middle part of the another reinforcing rod; the proper position on the floor of the vehicle is provided with a screw hole, so that the through hole of the bottom plate corresponds to the screw hole, and the lower screw rods with the matched number penetrate through the through hole of the bottom plate and are connected with the screw hole and screwed down by utilizing the hexagonal bulge; the annular plate between the inner ends of the four inclined rods of the table is placed in the middle of the octagonal vertical plate, the inner end rings of the inner ends of the four tension springs are used for respectively sleeving the four hooks B of the annular plate, then the tension steel rods are used for respectively sequentially penetrating the outer end rings of the outer ends of the four tension springs to enable the four outer end rings to be respectively sleeved on the hooks A on the inner face of the octagonal vertical plate, then the octagonal vertical plate is covered by the cover plate, the upper screw rods on the upper portions of the hexagonal protrusions respectively penetrate through holes of the cover plate, and the upper screw rods are locked by the elastic rings A and nuts.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

according to the vehicle-mounted damping desk and chair frame, the lower ends of the legs of the desk and chair are provided with the inclined rods, the inner ends of the inclined rods are fixedly connected with the annular plates, and the amplitude reduction of the desk and chair in any direction is obtained by the tension springs connecting the annular plates and the octagonal vertical plates; the annular bulge arranged on the bottom plate and the bulge strip at the notch can reduce the friction influence of the diagonal rod; the invention is suitable for food detection vehicles, medicine detection vehicles, wireless signal flow detection vehicles, flow air quality detection vehicles, flow medical vehicles, television rebroadcasting vehicles or special military and police vehicles, and is particularly suitable for mine exploration vehicles and military reconnaissance vehicles; when the shock absorption table is used for a shock absorption table, the influence on equipment in the running process of a vehicle can be partially solved; when the shock absorption chair is used for the shock absorption chair, the comfort of passengers can be improved.

[ description of the drawings ]

FIG. 1 is a perspective view of a chair according to the present invention;

FIG. 2 is a schematic view of the shock absorbing mechanism of the present invention;

FIG. 3 is a schematic perspective view of an octagonal riser of the present invention;

FIG. 4 is a schematic perspective view of an annular plate of the present invention;

FIG. 5 is a schematic view of the tension spring of the present invention;

FIG. 6 is a schematic perspective view of the cover plate of the present invention;

FIG. 7 is a schematic view of the screw configuration of the present invention;

FIG. 8 is a perspective view of the table of the present invention;

In the figure: 1. a cross bar; 2. a back plate; 3. a back frame; 4. a seat plate; 5. a rear leg; 6. a front leg; 7. fixing the rod; 8. a reinforcing rod; 9. an upper screw rod; 10. a nut; 11. a front diagonal rod; 12. a raised strip; 13. a cover plate; 14. an octagonal vertical plate; 15. opening the gap; 16. a rear diagonal member; 17. a hook A; 18. an outer end ring; 19. a tension spring; 20. an inner end ring; 21. an annular plate; 22. an annular projection; 23. a base plate; 24. a hook B; 25. a through hole; 26. a raised strip; 27. perforating; 28. an elastic ring A; 29. a hexagonal protrusion; 30. a lower screw rod; 31. an elastic ring B; 32. a desktop.

[ detailed description ] embodiments

The present invention will be explained in more detail by the following examples, which are intended to disclose all changes and modifications within the scope of the present invention, and the present invention is not limited to the following examples;

The vehicle-mounted damping desk and chair frame described in the attached figures 2 to 7 comprises four desk and chair support legs, oblique rods, annular plates 21, a bottom plate 23, an octagonal vertical plate 14, tension springs 19 and a cover plate 13, the lower ends of the four table and chair supporting legs are respectively provided with an oblique rod facing to the middle part, the annular plate 21 can be made into an octagonal structure, wherein, the four surfaces are fixedly connected with the inner ends of four diagonal rods, the annular plate 21 is positioned at the central position of the upper part of the bottom plate 23 of the octagonal vertical plate 14, the four equidistant surfaces of the octagonal vertical plate 14 are respectively provided with a gap 15, the middle parts of the four diagonal rods are positioned in the four gaps 15, annular bulges 22 are arranged at intervals on the outer edge of an annular plate 21 of a bottom plate 23 of the octagonal vertical plate 14, the annular bulges 22 are used for acquiring the line contact between the lower surfaces of four inclined rods and the bottom plate 23, the bottom parts of four notches 15 of the octagonal vertical plate 14 are respectively provided with a convex strip 12, and the convex strips 12 are used for acquiring the line contact between the lower surfaces of the four inclined rods and the convex strips 12; hooks A17 are respectively arranged on the inner surfaces of the other four surfaces of the octagonal vertical plate 14, outer end rings 18 respectively arranged at the outer ends of the four tension springs 19 are respectively sleeved on the four hooks A17 to form fixed connection, hooks B24 are respectively arranged on the other four surfaces of the annular plate 21, inner end rings 20 at the inner ends of the four tension springs 19 are respectively sleeved on the four hooks B24 to form fixed connection, a cover plate 13 is arranged at the upper opening of the octagonal vertical plate 14, and the bottom plate 23 is fixed on the floor of a vehicle.

with reference to fig. 1, 2, 3, 6 or 8, a downward protruding strip 26 is provided on the lower surface of the cover plate 13, the outer edge of the protruding strip 26 has the same shape as the inner surface of the upper opening of the octagonal upright plate 14, and the protruding strip 26 is clamped on the inner surface of the upper opening of the octagonal upright plate 14.

With reference to fig. 1, 2, 3, 6 or 8, a plurality of through holes 25 are formed in the bottom plate 23 away from the diagonal rods and the tension spring 19, lower screw rods 30 matched with the through holes 25 in number respectively penetrate through the through holes 25 of the bottom plate 23 and then are connected with screw holes formed in the floor of the vehicle, a hexagonal protrusion 29 arranged at the upper end of each lower screw rod 30 is pressed on the upper surface of the bottom plate 23, and an elastic ring B31 is arranged between the lower surface of the hexagonal protrusion 29 and the bottom plate 23; the upper surface of the hexagonal protrusion 29 is provided with an upper screw 9, the upper screw 9 is locked by a nut 10 after passing through a through hole 27 of the cover plate 13 corresponding to the plurality of through holes 25 on the bottom plate 23, and an elastic ring A28 is arranged between the nut 10 and the cover plate 13.

With reference to fig. 1 to 7, the application of the shock-absorbing chair frame on the vehicle is that the four diagonal rods are divided into two front diagonal rods 11 and two rear diagonal rods 16, the upper parts of the outer ends of the two front diagonal rods 11 are front legs 6 of the chair, the upper parts of the outer ends of the two rear diagonal rods 16 are rear legs 5 of the chair, a reinforcing rod 8 is arranged at the lower part between the rear leg 5 and the front leg 6 on one side, another reinforcing rod 8 is arranged at the lower part between the rear leg 5 and the front leg 6 on the other side, a fixing rod 7 is arranged between the reinforcing rod 8 and the middle part of the another reinforcing rod 8, the upper parts of the two front legs 6 and the two rear legs 5 are seat plates 4, a back frame 3 formed by the two vertical rods is arranged at the upper ends of the two rear legs 5, and a cross rod 1; a screw hole is arranged at a proper position on the floor of the vehicle, the through hole 25 of the bottom plate 23 corresponds to the screw hole, and the lower screw rods 30 with the matched number penetrate through the through hole 25 of the bottom plate 23 and are connected with the screw hole and are screwed tightly by the hexagonal protrusion 29; the annular plate 21 between the two rear inclined rods 16 and the inner ends of the two front inclined rods 11 of the chair is placed in the middle of the octagonal vertical plate 14, the four hooks B24 of the annular plate 21 are respectively sleeved by the inner end rings 20 at the inner ends of the four tension springs 19, then the four outer end rings 18 at the outer ends of the four tension springs 19 are respectively and sequentially penetrated by tensile steel rods to respectively enable the four outer end rings 18 to be respectively sleeved on the hooks A17 on the inner surface of the octagonal vertical plate 14, then the octagonal vertical plate 14 is covered by the cover plate 13, at the moment, the upper screw rods 9 on the upper parts of the hexagonal protrusions 29 respectively penetrate through holes 25 of the cover plate 13, and the upper screw rods 9 are locked by the elastic rings A.

With reference to fig. 2 to 8, in the application of the shock-absorbing table and chair frame on the table on the vehicle, four diagonal rods are distributed radially, four table legs are respectively arranged at the upper parts of the outer ends of the four diagonal rods, table tops 32 are arranged at the upper ends of the four table legs, a reinforcing rod 8 is arranged at the lower part between the two table legs at one side, another reinforcing rod 8 is arranged at the lower part between the two table legs at the other side, and a fixing rod 7 is arranged between the reinforcing rod 8 and the middle part of the another reinforcing rod 8; a screw hole is arranged at a proper position on the floor of the vehicle, the through hole 25 of the bottom plate 23 corresponds to the screw hole, and the lower screw rods 30 with the matched number penetrate through the through hole 25 of the bottom plate 23 and are connected with the screw hole and are screwed tightly by the hexagonal protrusion 29; the annular plate 21 between the inner ends of four inclined rods 16 of the table is placed in the middle of an octagonal vertical plate 14, four hooks B24 of the annular plate 21 are respectively sleeved by using inner end rings 20 at the inner ends of four tension springs 19, then four outer end rings 18 at the outer ends of the four tension springs 19 are respectively and sequentially penetrated through by using tensile steel rods so that the four outer end rings 18 are respectively sleeved on hooks A17 on the inner surface of the octagonal vertical plate 14, then the octagonal vertical plate 14 is covered by using a cover plate 13, at the moment, upper screw rods 9 on the upper parts of hexagonal protrusions 29 respectively penetrate through holes 25 of the cover plate 13, and the upper screw rods 9 are locked by using elastic rings A28 and nuts 10.

The present invention is not described in detail in the prior art.