ROTATABLE CHAIR

Abstract

A rotatable chair comprising a backrest unit, a seat plate unit, a supporting unit and a rotating unit; the rotating unit comprises an upper plate, a lower plate, a rotating disc, a connecting shaft, a first elastic ball and a handle; the backrest unit and the seat plate unit are fixed to the upper plate; the upper plate is provided with an upper locating hole; the supporting unit is fixed to the lower plate; the lower plate is provided with a plurality of lower locating holes; the rotating disc is disposed between the upper plate and the lower plate; the connecting shaft penetrates through the central position of the upper plate, the rotating disc and the lower plate at the same time; the first elastic ball comprises an elastic piece and a locating ball.

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a chair, and more particularly, to a rotatable chair.

BACKGROUND OF THE INVENTION

In a modern society, the aging population has inevitably become a serious problem. Therefore, nursing people who are old, sick, weak and disabled is particularly important. A reasonable design of the chair is crucial for users who need to sit on the chair for a long time. However, traditional wheelchairs sold on the market usually adopt a fixed structure. This inconvenient arrangement makes it difficult for users to transfer onto a bed or other instruments from the chair.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the shortcomings in the prior art and provide a rotatable chair.

To achieve the above purpose, the present invention adopts the following technical solution:

A rotatable chair comprising a backrest unit, a seat plate unit, a supporting unit and a rotating unit; the rotating unit comprises an upper plate, a lower plate, a rotating disc, a connecting shaft, a first elastic ball and a handle; the backrest unit and the seat plate unit are disposed above the upper plate, and are fixed to the upper plate; the upper plate is provided with an upper locating hole; the supporting unit is disposed underneath the lower plate, and is fixed to the lower plate; the lower plate is provided with a plurality of lower locating holes; the plurality of lower locating holes is distributed in the front, rear, left and right directions of the lower plate; the rotating disc is disposed between the upper plate and the lower plate; a plurality of rolling balls is uniformly distributed on the rotating disc; the rolling balls simultaneously protrude from the upper surface and the lower surface of the rotating disc; the connecting shaft penetrates through the central position of the upper plate, the rotating disc and the lower plate simultaneously, thereby positioning the upper plate, the rotating disc and the lower plate in a radial direction; the first elastic ball comprises an elastic piece and a locating ball; the elastic piece is disposed on the upper plate; the locating ball, which is molded with the elastic piece and is located in the upper locating hole, possesses a potential energy of moving towards the lower plate; when the lower locating hole and the upper locating hole are butted, the locating ball enters into the lower locating hole; one end of the handle is connected to the first elastic ball, and the other end of the handle is disposed on the outer side of the upper plate; the handle can be pressed to lever the locating ball to escape the lower locating hole.

In another preferred embodiment, the rotating unit comprises an upper disc and a lower disc. The upper disc is disposed between the upper plate and the rotating disc, and the lower disc is disposed between the lower plate and the rotating disc.

In another preferred embodiment, the rotating unit comprises a locating square tube. The locating tube is threaded with the upper surface of the upper plate, and the first elastic ball is disposed in the locating square tube.

In another preferred embodiment, the supporting unit comprises a first supporting leg and a second supporting leg that are arranged in a crosswise manner. The first supporting leg and the second supporting leg respectively comprise a chair-leg bending tube and a telescopic leg that is connected to the chair-leg bending tube. The chair-leg bending tube is connected to the lower plate.

In another preferred embodiment, the telescopic leg comprises an inner tube and an outer tube. The inner tube is provided with a plurality of first holes. Further, the outer tube is provided with a plurality of second holes that are arranged along the outer tube in an axial direction. A plurality of second elastic balls are disposed in the inner tube. The second elastic balls penetrate through the first hole and the second hole that are butted at the same time.

In another preferred embodiment, a leg sleeve is mounted at the lower end of the outer tube.

In another preferred embodiment, the backrest unit comprises a backrest bending tube, backrest sleeves and a backrest plate. The backrest sleeves are mounted on the upper plate. The backrest bending tube is connected to the backrest sleeves, and the backrest plate is mounted on the backrest bending tube.

In another preferred embodiment, the seat plate unit comprises a chair plate, armrest bending tubes and armrest sleeves. The armrest sleeves are mounted on the backrest sleeves. The armrest bending tubes are connected to the end portion of the armrest sleeves, and the chair plate is mounted on the armrest sleeves.

Compared with the prior art, the present invention has the following advantages:

Normally, the locating ball is positioned in the upper locating hole and the lower locating hole at the same time so that the upper plate and the lower plate can be positioned. When the direction needs to be adjusted, the handle can be pressed down by the user. As a result, the locating ball is levered to escape the lower locating hole through the lever principle. The upper plate can rotate relative to the lower plate, thereby changing the orientation of the user sitting on the chair plate. Thus, the movement of the user can be facilitated. After the direction is established, the handle can be loosened and the locating ball re-enters into the lower locating hole, and the upper plate and the lower plate are re-positioned. Thus, the chair is more stable and safe.

BRIEF DESCRIPTION OF THE DRAWINGS

To clearly expound the technical solution of the present invention, the drawings and embodiments are hereinafter combined to illustrate the present invention. Obviously, the drawings are merely some embodiments of the present invention and those skilled in the art can associate themselves with other drawings without paying creative labor.

FIG. 1 is an explosive view of the rotatable chair of the present invention;

FIG. 2 is a schematic diagram of the seat plate unit of the present invention;

FIG. 3 is a schematic diagram of the backrest unit of the present invention;

FIG. 4 is schematic diagram of the rotating unit of the present invention;

FIG. 5 is a schematic diagram of the supporting unit of the present invention;

FIG. 6 is a schematic diagram illustrating the assembled rotatable chair of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Drawings and detailed embodiments are combined hereinafter to elaborate the technical principles of the present invention.

As shown in FIGS. 1-6, the rotatable chair comprises a backrest unit 2, a seat plate unit 1, a supporting unit 4 and a rotating unit 3. The rotating unit 3 comprises an upper plate 31, a lower plate 32, a rotating disc 35, a connecting shaft 39, a first elastic ball 38 and a handle 37. The upper plate 31 is square-shaped. The backrest unit 2 and the seat plate unit 1 are disposed above the upper plate 31, and are fixed to the upper plate 31. The upper plate 31 is provided with an upper locating hole. The lower plate 32 is also square-shaped. The supporting unit 4 is disposed underneath the lower plate 32, and is fixed to the lower plate 32. The lower plate 32 is provided with four lower locating holes, which are distributed in the front, rear, left and right directions of the lower plate 32. When the upper plate 31 rotates relative to the lower plate 32, the upper locating hole can be butted with any lower locating hole. The rotating disc 35 is disposed between the upper plate 31 and the lower plate 32. A plurality of rolling balls is uniformly distributed on the rotating disc 35, and the rolling balls simultaneously protrude from the upper surface and the lower surface of the rotating disc 35. Thus, the friction produced between the rotating disc 35 and the contact bodies can be effectively reduced due to this rolling friction. The connecting shaft 39 penetrates through the central position of the upper plate 31, the rotating disc 35 and the lower plate 32 at the same time, thereby positioning the upper plate 31, the rotating disc 35 and the lower plate 32 in a radial direction. The first elastic ball 38 comprises a U-shaped elastic piece 381 and a cylindrical locating ball 382. The elastic piece 381 is disposed on the upper plate 31. The locating ball 382 is molded with one end of the elastic piece 381, and is located in the upper locating hole. Under the action of the elastic piece 381, the locating ball 382 possesses a potential energy of moving towards the lower plate 32. Namely, when the lower locating hole is butted with the upper locating hole, the locating ball 382 enters into the lower locating hole. One end of the handle 37 is connected to the first elastic ball 38, and the other end of the handle 37 is disposed on the outer side of the upper plate 31. The handle 37 can be levered up and down, through which the locating ball 382 can be levered to leave the lower locating hole. Through the first elastic ball 38, the upper locating hole and the lower locating hole, the upper plate 31 and the lower plate 32 can be easily positioned. The rotatable chair of the present invention has a simple structure, which is cost-effective and can be conveniently operated by users.

Furthermore, the rotating unit 3 comprises an upper disc 34 and a lower disc 33. The upper disc 34 is disposed between the upper plate 31 and the rotating disc 35, and the lower disc 33 is disposed between the lower plate 32 and the rotating disc 35. The upper disc 34 and the lower disc 33 are respectively provided with a central hole, and are coaxially arranged with the upper plate 31. The upper disc 34 is placed between the upper plate 31 and the rotating disc 35, and the lower disc 33 is placed between the rotating disc 35 and the lower plate 32. Such a configuration facilitates the rotation between the upper plate 31 and the lower plate 32, and increases the structural strength between the upper plate 31 and the lower plate 32.

The rotating unit 3 comprises a locating square tube 36. The locating square tube 36 is threaded with the upper surface of the upper plate 31, and the first elastic ball 38 is disposed in the locating square tube 36. Namely, one end of the elastic piece 381 abuts against the upper inner surface of the locating square tube 36, and the other end of the elastic piece 381 corresponds to the upper locating hole. Thus, the locating ball 382 is located in the upper locating hole, and the elastic piece 381 is in a compressed state. The elastic piece 381 is connected to the tube wall of the locating square tube 36 through bolts so that the stability of the elastic piece 381 can be further ensured. The handle 37 is connected to one end of the locating ball 382 that faces towards the elastic piece 381.

Further, the upper plate 31 includes a handle fulcrum 5, through which the handle can be conveniently pressed.

The upper plate 31 is provided with a reset stop block 6. When the seat plate unit 1 returns to the initial position after rotating for a certain angle, the handle 37 abuts against the reset stop block 6. Thus, the upper locating hole can be butted with the lower locating hole, enabling the seat plate unit 1 to be conveniently reset.

The supporting unit 4 comprises a first supporting leg 41 and a second supporting leg 42 that are arranged in a crossed manner. The first supporting leg 41 and the second supporting leg 42 respectively comprise a chair-leg bending tube 411 and a telescopic leg 412 that is connected to the chair-leg bending tube 411. The chair-leg bending tube 411 is connected to the lower plate 32 through bolts. The chair-leg bending tube 411 is configured to be U-shaped. The telescopic leg 412 comprises an inner tube 4121 and an outer tube 4122. The inner tube 4121 is provided with two first holes, which are formed on the side wall of the two ends of the inner tube 4121. The outer tube 4122 is provided with a plurality of second holes that are arranged along the outer tube 4122 in an axial direction. Two second elastic balls 4123 are disposed in the inner tube 4121. The two second elastic balls 4123 respectively correspond to the two first holes, and each second elastic ball 4123 protrudes from the exterior of the inner tube 4121 through the corresponding first hole. The upper end of the inner tube 4121 is located at the exterior of the outer tube 4122, and is engaged with the chair-leg bending tube 411 through the second elastic ball 4123. The lower end of the inner tube 4121 is located in the outer tube 4122. When the second elastic ball 4123 penetrates through the first hole and the second hole that are butted at the same time, the inner tube 4121 and the out tube 4122 can be connected and positioned. Meanwhile, the inner tube 4121 and the outer tube 4122 can coordinate with each other to achieve a telescopic function when the first hole is butted with different second holes. By means of the telescopic leg 412 of the present invention, the height of the seat plate unit 1 can be effectively adjusted. Thus, users with different heights can conveniently use the chair, and perform different operations when sitting on the chair.

A leg sleeve is mounted at the lower end of the outer tube 4122, thereby ensuring the stability of the chair.

Additionally, the backrest unit 2 comprises a backrest bending tube 22, a backrest sleeve 23 and a backrest plate 21. There are two backrest sleeves 23. The two backrest sleeves are mounted on the upper plate 31 in parallel through bolts. The backrest bending tube 22 is inserted into the end portion of the backrest sleeve 23, and is engaged with the end portion of the backrest sleeve 23 through the elastic balls. The backrest plate 21 is mounted on the backrest bending tube 22 through bolts. In such a way, the chair can be conveniently disassembled and transported.

The seat plate unit 1 comprises a chair plate 11, an armrest bending tube 12 and an armrest sleeve 13. There are two armrest sleeves 13. The two armrest sleeves are mounted on the backrest sleeves through bolts, and are perpendicular to the backrest sleeves 23. There are two armrest bending tubes 12. The two armrest bending tubes are respectively inserted into the two ends of the armrest sleeves 13, and are engaged with the armrest sleeves 13 through the elastic balls. The chair plate is mounted on the armrest sleeves 12 though bolts. Users can lean against the armrests. The seat plate unit 1 is a detachable structure, which can be conveniently disassembled and transported.

The description of above embodiments allows those skilled in the art to realize or use the present invention. Without departing from the spirit and essence of the present invention, those skilled in the art can combine, change or modify correspondingly according to the present invention. Therefore, the protective range of the present invention should not be limited to the embodiments above but conform to the widest protective range which is consistent with the principles and innovative characteristics of the present invention. Although some special terms are used in the description of the present invention, the scope of the invention should not necessarily be limited by this description. The scope of the present invention is defined by the claims.

Claims

1. A rotatable chair, comprising:

a backrest unit,

a seat plate unit,

a supporting unit, and

a rotating unit, wherein the rotating unit comprises an upper plate, a lower plate, a rotating disc, a connecting shaft, a first elastic ball and a handle, wherein the backrest unit and the seat plate unit are disposed above the upper plate, and are fixed to the upper plate, wherein the upper plate is provided with an upper locating hole, wherein the supporting unit is disposed underneath the lower plate, and is fixed to the lower plate, wherein the lower plate is provided with a plurality of lower locating holes, wherein the plurality of lower locating holes is distributed in the front, rear, left and right directions of the lower plate, wherein the rotating disc is disposed between the upper plate and the lower plate, wherein a plurality of rolling balls is uniformly distributed on the rotating disc, wherein the rolling balls simultaneously protrude from the upper surface and the lower surface of the rotating disc, wherein the connecting shaft penetrates through the central position of the upper plate, the rotating disc and the lower plate at the same time, thereby positioning the upper plate, the rotating disc and the lower plate in a radial direction, wherein the first elastic ball comprises an elastic piece and a locating ball, wherein the elastic piece is disposed on the upper plate, wherein the locating ball, which is molded with the elastic piece and is located in the upper locating hole, possesses a potential energy of moving towards the lower plate, wherein when the lower locating hole and the upper locating hole are butted, the locating ball enters into the lower locating hole, wherein one end of the handle is connected to the first elastic ball, and the other end of the handle is disposed on the outer side of the upper plate, wherein the handle can be pressed to lever the locating ball to escape the lower locating hole.

2. The rotatable chair of claim 1, wherein the rotating unit comprises an upper disc and a lower disc, wherein the upper disc is disposed between the upper plate and the rotating disc, and the lower disc is disposed between the lower plate and the rotating disc.

3. The rotatable chair of claim 2, wherein the rotating unit comprises a locating square tube, wherein the locating tube is threaded with the upper surface of the upper plate, and the first elastic ball is disposed in the locating square tube.

4. The rotatable chair of claim 1, wherein the supporting unit comprises a first supporting leg and a second supporting leg that are arranged in a crossed manner, wherein the first supporting leg and the second supporting leg respectively comprise a chair-leg bending tube and a telescopic leg that is connected to the chair-leg bending tube, wherein the chair-leg bending tube is connected to the lower plate.

5. The rotatable chair of claim 4, wherein the telescopic leg comprises an inner tube and an outer tube, wherein the inner tube is provided with a plurality of first holes, wherein the outer tube is provided with a plurality of second holes that are arranged along the outer tube in an axial direction, wherein a plurality of second elastic balls are disposed in the inner tube, wherein the second elastic balls penetrate through the first hole and the second hole that are butted at the same time.

6. The rotatable chair of claim 5, wherein a leg sleeve is mounted at the lower end of the outer tube.

7. The rotatable chair of claim 1, wherein the backrest unit comprises a backrest bending tube, backrest sleeves and a backrest plate, wherein the backrest sleeves are mounted on the upper plate, wherein the backrest bending tube is connected to the backrest sleeves, and the backrest plate is mounted on the backrest bending tube.

8. The rotatable chair of claim 7, wherein the seat plate unit comprises a chair plate, armrest bending tubes and armrest sleeves, wherein the armrest sleeves are mounted on the backrest sleeves, wherein the armrest bending tubes are connected to the end portion of the armrest sleeves, and the chair plate is mounted on the armrest sleeves.