RU212380U1 - SEAT ROTATING DEVICE - Google Patents

Abstract

The utility model relates to a seat swivel device that can be used in stools, chairs, office chairs and other seats. The seat swivel device contains a bushing with a central hole in which a shaft is located, made with the possibility of rotation with the help of bearings pressed into the specified bushing. Said shaft rests with its lower end section on a metal ball located on the bottom section of said bushing. A friction ring is installed on said shaft, located between two said bearings and blocking the central hole of said bushing. The technical result is aimed at improving the reliability of the rotary device of the seat. 4 w.p. f-ly, 3 ill.

Description

Technical field

The proposed technical solution relates to a seat swivel device that can be used in stools, chairs, office chairs.

Prior Art

In the prior art, a rotary seat device is known (see CN 212630329 U, IPC A47C 3/18, publ. 03/02/2021), containing a rotating shaft connected to the seat cushion and associated with the possibility of rotation with a sleeve connected to the base of the specified seat. The rotation of the shaft inside the sleeve is carried out using a ball bearing pressed into the upper zone of the specified sleeve. Below the ball bearing, between the rotating shaft and the sleeve, two friction rubber rings are installed, which increase the friction force that prevents the said shaft from rotating quickly.

The disadvantages of the known rotary device is the possibility of jamming, because under heavy load, the rotating shaft can deviate.

In the prior art, a rotary seat device is known (see CN202005447 U, IPC A47C 3/18, A47C 7/00, publ. 10/12/2021), containing a rotating shaft fixedly connected to the base of the seat cushion. The Central section of the specified rotating shaft is installed in the axial hole of the sleeve using two or more bearings shown in figures 2, 3. Known rotary device can perform its function, but is not reliable enough to withstand the axial load. In addition, the absence of a friction element in the device can lead to rapid rotation of the shaft with the seat, which also reduces the reliability of the latter.

Utility Model Disclosure

The technical result consists in increasing the reliability of the rotary device of the seat.

The specified technical result is achieved in a rotary device of the seat, containing a sleeve with a central hole, in which a shaft is located, made with the possibility of rotation with the help of bearings pressed into the specified sleeve, according to the utility model, the specified shaft rests with its lower end section on a metal ball located on the bottom section of said bushing, wherein a friction ring is installed on said shaft, located between two said bearings and blocking the central hole of said bushing.

The bottom section of the sleeve, on which the metal ball rests, may have a recess with a conical surface.

The lower end section of the shaft, resting on a metal ball, may have a recess with a conical surface.

The bushing may contain annular landing ledges located in the central hole, on which the bearings rest with their outer rings.

The friction ring can be made of rubber.

The totality of features of the proposed swivel device of the seat is in a causal relationship with the achieved technical result and is presented in the formula of the utility model.

The essence of the technical solution is illustrated by the figures.

Fig. 1 is a schematic representation of a seat with a swivel device.

Fig. 2 is a schematic sectional view of the seat swivel device.

Fig. 3- schematically shows the sections of the sleeve and the shaft of the rotary device of the seat.

The figures above show:

1- rotary device;

2- seat;

2a - seat cushion 2;

3- bushing;

3a - side wall of the sleeve 3;

3b - inner surface of the sleeve 3;

3c - bottom section of sleeve 3;

4- central hole of bushing 3;

5- shaft;

5a - lower end section of shaft 5;

5b - upper section of the shaft 5;

6- bearing;

6a - the outer ring of the bearing 6;

6b- bearing inner ring 6;

7- bearing;

7a - the outer ring of the bearing 7;

7b- bearing inner ring 7;

8- annular landing ledge;

9- annular landing ledge;

10- friction ring;

10a - side wall of the friction ring 10;

11- metal ball;

12- seat support assembly 2;

12a - plate;

12b - tubular element.

It should be understood that those skilled in the art will be able to suggest other embodiments of the utility model, and that some of its details can be changed in various other aspects, without going beyond the essence and scope of the present utility model. Accordingly, the explanatory figures and the detailed description of the seat rotator are illustrative and not restrictive.

The inventive rotary device 1 of the seat 2 contains a sleeve 3 with a central hole 4 in which the shaft 5 is located, which is rotatable about its axis L with the help of at least two bearings 6 and 7 (see Fig. 1, 2).

In the central hole 4 between the shaft 5 and the side wall 3a of the sleeve 3, at least two bearings 6 and 7 are installed, the corresponding outer rings 6a and 7a of which are tightly pressed into the specified sleeve 3, and the corresponding inner rings 6b and 7b are fitted with an interference fit on shaft 5, which allows said shaft 5 to withstand the axial load and not move in the central hole 4 of the sleeve 3 during the operation of the seat 2. The said side wall 3a of the sleeve 3 has an annular shape.

The sleeve 3 contains annular landing ledges 8 and 9 located in the central hole 4. The bearing 6 rests with its outer ring 6a on the landing ledge 8, and the bearing 7 rests with its outer ring 7a on the landing ledge 9.

Between the two bearings 6, 7 there is a friction ring 10 mounted with an interference fit on the shaft 5 and coupled with the outer surface of its side wall 10a with the inner surface 3b of the sleeve 3. During the rotation of the shaft 5 with the seat 2, the specified friction ring 10 creates a friction force between the outer surface side wall 10a and the inner surface 3b of the sleeve 3, which slows down the speed of rotation of the specified shaft 5 and virtually eliminates the spontaneous rotation of the seat 2, for example, with a strong gust of wind or a slight impact on the seat 2.

Said friction ring 10 covers the central hole 4 of the bushing 3, thereby preventing the lubrication of the bearing located in the lower zone of the bushing 3, in particular the bearing 7, from escaping from said bushing 3, and also prevents penetration into said bearing 7, for example, of dust and/or moisture. , which generally increases the reliability of the rotary device 1 of the seat 2.

The sleeve 3 of the rotary device 1 has a bottom section 3c on one side. In the central hole 4 on the bottom section 3c of the sleeve 3 is a metal ball 11, which acts as a support bearing. In the case when the user leans on the cushion 2a of the seat 2, the load is transmitted through the shaft 5 to the ball 11, which makes it possible to prevent blocking of the rotary device 1 and, thereby, to increase the reliability of the said rotary device 1.

To improve the reliability of the rotary device 1, the bottom section 3c of the sleeve 3, on which the metal ball 11 rests, and the lower end section 5a of the shaft 5, based on the metal ball 11, have a recess with a conical surface, which minimizes the possibility of ball 11 jamming in a space limited the indicated sections 3c and 5a (see Fig. 3).

In a particular case of execution: the bottom section 3c of the sleeve 3 exceeds the diameter of the ball 11, and the lower end section 5a of the shaft 5 corresponds to or slightly less than the diameter of the specified ball 11; shaft 5 is made in the form of a single non-separable metal part; bushing 3 is made in the form of a single non-separable metal part; the friction ring 10 is made of rubber.

The possibility of making the shaft 5 in the form of a prefabricated part is not excluded.

The friction ring 10 can be made of an elastic elastic material, such as rubber with various additives that increase the working life of the specified friction ring 10.

It is not excluded the possibility of making the sleeve 3 and the friction ring 10 by injection molding of a composite material, such as glass-filled or mineral-filled.

The possibility of making the bottom section 3c of the sleeve 3 in the form of a spherical socket is not excluded. In addition, instead of a separately installed metal ball 11, at least the lower end section 5a of the shaft 5 can be made outwardly curved, for example, in the form of a spherical segment located on the specified bottom section 3a.

As these bearings 6, 7, standard radial rolling bearings known from the prior art can be used, for example, single-row radial ball bearings containing outer and inner rings, between which a separator and rolling elements (balls) are installed. Due to the small moment of friction of the balls, these bearings 6, 7 have high rotation speeds.

The bearing 6, located in the upper zone of the sleeve 3, can be made of a larger diameter in relation to the bearing 7, located in the lower zone of the sleeve 3, since the specified bearing 6 must withstand greater loads than the bearing 7. In a specific embodiment, the outer 6a and the inner 6b the bearing rings 6 are made of a larger diameter relative to the outer 7a and inner 7b rings of the bearing 7.

It is not excluded the possibility of making these bearings 6, 7 of the same size, which increases the manufacturability of the assembly of the rotary device 1.

The upper section 5b of the shaft 5 of the rotary device 1 is fixedly installed in the support assembly 12 of the seat 2. Said support assembly 12 comprises a plate 12a and a tubular element 12b made with a hole fixed to each other, for example, by welding or other connection. The upper section 5b of the shaft 5 is pressed into said hole of the tubular element 12b, which allows the support assembly 12 to rotate with the shaft 5. The plate 12a of the support assembly 12 is fixedly connected to the lower section of the seat 2, which allows at least the cushion 2a to rotate with the shaft 5 with respect to the axis L. In a specific embodiment, the support assembly 12 is made of metal.

During operation of the seat 2, the user leans on the cushion 2a of the seat 2, transferring the force through the shaft 5 to the metal ball 11 located on the bottom section 3c of the sleeve 3. During the rotation of the cushion 2a, the latter, together with the shaft 5, rotate about the axis L with the help of bearings 6 and 7, while the speed of rotation of the shaft 5 is damped by the friction ring 10. Said rotary device 1 allows the shaft 5 to rotate together with the cushion 2a of the seat 2 at an angle of 360° or any other angle required by the user.

The design of the rotary device 1 of the seat 2 described above is compact, characterized by its reliability and manufacturability of assembly, and can be used in the design of at least office chairs, household chairs and stools, as well as other devices.

Claims (5)

1. Rotary seat device containing a sleeve with a central hole, in which a shaft is located, made with the possibility of rotation with the help of bearings pressed into the specified sleeve, characterized in that the said shaft rests with its lower end section on a metal ball located on the bottom section of the specified bushings, while said shaft has a friction ring located between two said bearings and covering the central hole of said bushing. 2. The rotary device of the seat according to claim 1, characterized in that the bottom section of the sleeve, on which the metal ball rests, has a recess with a conical surface. 3. Rotary seat according to claim 1, characterized in that the lower end section of the shaft, resting on a metal ball, has a recess with a conical surface. 4. Rotary seat device according to claim 1, characterized in that the sleeve contains annular landing ledges located in the central hole, on which the bearings rest with their outer rings. 5. Rotary seat according to claim 1, different the fact that the friction ring is made of rubber.

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