KR19990009615U - Bearings for swivel chairs - Google Patents

Abstract

At least a spindle mounted in an outer cylinder, a cushioning elastic member and bearing support and bearing member embedded in the spindle, a screw nut and clutch having protrusions and grooves, a screw shaft, and a fixing member and seat plate for fixing the screw shaft. In a screw spindle for a swivel chair comprising a screw shaft stopper formed on the screw shaft to prevent a rise, the bearing member is made of a single material and of a single component, wherein the bearing member is circular. It consists of a circular outer body and a circular inner body, the circular outer body and the circular inner body is formed integrally with each other by a joint member, it is preferable that the portion other than the joint member is composed of a grease charging portion filled with grease.

Therefore, the bearing member can be composed of a single material, so it is excellent in durability and very good in manufacturing, and the number of balls and bearing supports can be reduced, which is advantageous for cost reduction, and the grease flow groove is formed in spite of frequent use. The grease is smoothly supplied to the entire bearing member to protect the parts and increase the comfort of the swivel chair.

Description

Bearings for swivel chairs

The present invention relates to a bearing member for a swivel chair, and more particularly to a bearing member for a rotary chair to achieve a cost down by reducing the number of parts by using a bearing member of a single element and a single material.

Generally, the bearing member for a swivel chair is for smoothly rotating a chair seat while supporting the load of a seated person as a part of a screw spindle. Prior to the description of the bearing member of the chair seat of the present invention, a screw spindle for a swivel chair will be briefly described.

1 is an exploded perspective view showing a structure of a conventional screw spindle for a rotating chair, Figure 2 is a longitudinal sectional view showing a structure of a conventional screw spindle for a rotating chair.

In these figures, reference numeral 10 denotes an outer cylinder, and 20 denotes a spindle mounted in the outer cylinder 10. The outer cylinder 10 has a cylindrical shape and the spindle 20 has a tapered insertion portion 22 inserted into a seat plate (not shown) and a built-in tube portion 24 having a caulking portion 24a for supporting a support ring described later. Consists of In the spindle 20, a cushioning elastic member 30, for example, a spring is elastically installed for the comfort of the seated seat and a ball bearing 50 for smooth rotation of the spindle 20 and a rubber ring for maintaining the height 60 and the screw nut 70 and the clutch 80 for height adjustment are mounted. Reference numeral 12 is installed between the outer cylinder 10 and the spindle 20, the spindle guide for supporting these two members, 32 is a support ring installed between the caulking portion 24a and the elastic member 30, 42 and 44 are disposed above and below the ball bearing 50 to support the ball bearing 50, and 52 is a ball used for the ball bearing 50.

In the spindle 20, a screw shaft 90 penetrating all parts such as the elastic member 30, the ball bearing 50, the rubber ring 60, the screw nut 70, the clutch 80, etc. Is mounted. The lower portion of the screw shaft 90 is provided with a fixing member 100 is formed with a circular fixing hole 102 for preventing the idle rotation of the screw shaft 90, the infinite drop of the screw nut 70 In order to prevent the cylindrical nut support 94 is installed.

The clutch 80 is fixed to the bottom of the lower surface of the spindle 20 by curling or the like. The screw nut 70 has an inclined inclined groove 72 for receiving the rubber ring 60 at an upper portion thereof, and a lower portion of the screw nut 70 has a plurality of grooves for engaging with the clutch 80. (78) is formed. The clutch 80 has a plurality of protrusions 82 formed at the top thereof to rotate in engagement with the recesses 78 of the screw nut 70.

The screw spindle for a conventional rotating chair configured as described above has a seat plate on its upper end and the lower end of the outer cylinder 10 is installed at the center of the leg of the chair.

The user adjusts the height between the floor and the seat of the chair appropriately to his or her body in order to secure a correct seating position or to obtain a comfortable seating feeling. That is, the height of the seat plate is adjusted. At this time, the seat plate is turned clockwise or counterclockwise to adjust the height. When the seat plate rotates, the spindle 20 connected to the seat plate rotates, and since the lower part of the spindle 20 and the clutch 80 are cocked, the clutch 80 also rotates together.

Since the clutch 80 is engaged with the screw nut 70, the screw nut 70 consequently moves up and down with respect to the screw shaft 90 which is fitted. That is, since the screw shaft 90 is fixed to the outer cylinder 10 through the fixing member 100, the rotational movement of the spindle 20 is changed to a linear movement by taking the thread of the screw shaft 90 to the spindle ( 20) moves up and down to adjust the height of the seat.

Since the spindle 20 descends when the screw nut 70 and the clutch 80 are loaded from the upper side (a user's seated state), the screw nut 70 and the clutch 80 are brought down by the clutch 80. When the load is not reversed (when the user is not seated), the spindle 20 rises, so that the clutch 80 also rises to engage the screw nut 70 and the clutch 80. Therefore, the height adjustment is made in a state where the screw nut 70 and the clutch 80 are engaged.

However, the conventional screw spindle for the rotating chair having such a structure and operating has the following problems.

The ball bearing 50 for smooth rotation of the spindle 20 is configured by mounting at least four or five balls (52). This is a general method adopted to minimize the sliding resistance, in order to manufacture the ball bearing 50 body should be mounted to the ball 52, which is a metal material on the hard synthetic resin material. The metal ball embedded ball bearing 50 is not only complicated in the manufacturing process but also has a problem in durability and an obstacle in achieving cost down due to an increase in the number of parts.

The present invention is devised to solve the problem of the conventional ball bearing 50, the purpose is to achieve a cost down by reducing the number of parts by using a bearing element of a single element and a single material, and also good durability In providing a bearing member for a swivel chair.

1 is an exploded perspective view showing the structure of a conventional screw spindle for a rotating chair

Figure 2 is a longitudinal sectional view showing the structure of a conventional screw spindle for a rotating chair

Figure 3 is an exploded perspective view showing the structure of the screw spindle for the rotating chair adopting the bearing member of the present invention

Figure 4 is a longitudinal sectional view showing the structure of the screw spindle for the rotating chair adopting the bearing member of the present invention

5 is a perspective view showing the bearing member of the present invention

Figure 6 is a perspective view showing a part cut to explain the internal structure of the bearing member of the present invention

7 is a cross-sectional view showing a gas cylinder spindle structure employing the bearing member of the present invention.

Explanation of symbols for main parts of the drawings

10: outer cylinder 12: spindle guide

20: spindle 22: insert

23: step 24: internal tube

24a: caulking portion 26: insertion member

30: elastic member 32: support ring

42,44: Bearing support 50: Ball bearing

52: ball 60: rubber ring

70: screw nut 72: inclined groove

78: groove 80: clutch

90: screw shaft 92: fixed end

94: nut support 100: fixing member

102: fixing hole 500: bearing member

510: circular outer body 520: circular inner body

530: joint member 540: grease charging unit

550: Grease flow groove 560: Screw shaft through hole

600: outer cylinder 602: cylinder protector

604: cylinder 605: O-ring

606: airtight member 608: piston

610: piston rod 620: elastic member

700: working fluid

The bearing member for the rotating chair of the present invention for achieving the above object includes at least a spindle mounted in an outer cylinder, a cushioning elastic member, a bearing support and a bearing member embedded in the spindle, a screw nut and a clutch having protrusions and grooves; A screw spindle for a swivel chair comprising a screw shaft, a fixing member for holding the screw shaft and a screw shaft stopper formed on the screw shaft to prevent an indefinite rise of the seat plate. Here, the bearing member is composed of a circular outer body and a circular inner body, the circular outer body and the circular inner body is formed integrally with each other by a joint member, other than the joint member It is preferable that the grease is composed of a grease charging part filled with grease.

In addition, the joint member may be set smaller than the height of the circular outer body and the circular inner body so that the working fluid can freely travel all over the bearing member, and the bearing member is any one selected from a hard synthetic resin material or Teflon or FRP. Good to do.

In addition, it is preferable to form a grease flow groove on the upper surface of the grease filling unit for smooth flow of the grease.

In addition, the bearing member for the rotating chair of the present invention for achieving the above object is at least a circular outer cylinder, a cylinder protector provided in the outer cylinder, a cylinder closely mounted in the cylinder protector, installed on the cylinder A bearing member for a swivel chair comprising a sealing member, a piston rod having a working fluid filled inside a cylinder, a piston installed under the cylinder, and a bearing member provided on the piston rod, wherein the bearing member for a rotating chair is made of a single material and is formed of a single material. It is a component.

Also in such a gas cylinder system, it is preferable to form a grease flow groove on the upper surface of the grease filling part for smooth flow of grease.

Therefore, the bearing member can be composed of a single material, so it is excellent in durability and very good in manufacturing, and the number of balls and bearing supports can be reduced, which is advantageous for cost reduction, and the grease flow groove is formed in spite of frequent use. The grease is smoothly supplied to the entire bearing member to protect the parts and increase the comfort of the swivel chair.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to the bearing member for the rotary chair of the present invention.

In order to avoid confusion in the description, the same reference numerals are used for the same members having the same function as the conventional description. The bearing member of the present invention can be applied to a chair of a gas cylinder type as well as a chair of a screw spindle method. In the following description, only the chair spindle type chair structure will be described.

Figure 3 is an exploded perspective view showing the structure of the screw spindle for the rotating chair adopting the bearing member of the present invention, Figure 4 is a longitudinal sectional view showing the structure of the screw spindle for the rotating chair employing the bearing member of the present invention, Figure 5 is 6 is a perspective view showing the bearing member 500, Figure 6 is a perspective view showing a part cut to explain the internal structure of the bearing member 500 of the present invention.

The biggest feature of the present invention is that the conventional bearing support 42 and the ball bearing 50 are replaced with a bearing member 500 of a single material. This bearing member 500 is mounted between the elastic member 30 and the screw nut 70, as shown in FIG. 3 and FIG.

See FIGS. 5 and 6. In these figures, reference numeral 500 denotes a bearing member, and the bearing member 500 basically includes a circular outer body 510 and a circular inner body 520 that are circular in shape.

The circular outer body 510 and the circular inner body 520 are integrally formed by a joint member 530, and the joint member 530 is larger than the height of the circular outer body 510 and the circular inner body 520. It is set small. This is for the grease is filled in the bearing member 500 of the present invention so that the grease can flow freely in the bearing member 500.

In addition, the grease filling part 540, which is a space part, is formed by the formation of the joint member 530, and the grease flow groove 550 is formed on the top surface of the grease filling part 540 to smoothly flow the grease. Material of the bearing member 500 of the present invention may be selected from a hard synthetic resin material or Teflon or FRP.

Reference numeral 560 denotes a hole for passing through the screw shaft 70 formed in the center of the bearing member 500.

The operation of the bearing member for the swivel chair of the present invention having such a configuration will be described.

Basic buffering action and load bearing action are the same as before. Therefore, when only the operation peculiar to the bearing member 500 of the present invention, the grease in the space portion, that is, the grease charging portion 540 except for the joint member 530 between the circular outer body 510 and the circular inner body 520. It is supposed to be charged. The bearing member 500 of the present invention is used by being installed in a chair of a screw spindle type or a gas cylinder type.

7 is a cross-sectional view showing a gas cylinder type spindle structure employing the bearing member of the present invention.

In this figure, reference numeral 600 denotes an outer cylinder, 602 denotes a cylinder protector provided in the outer cylinder 600, and 604 denotes a cylinder closely mounted in the cylinder protector 602. In addition, an upper portion of the cylinder 604 is provided with an airtight member 606 equipped with a plurality of O-rings 605 to keep the working fluid (gas and oil) 700 inside the cylinder 604 airtight. It is installed on the piston rod 610 so that the piston 608 which moves up and down by the working fluid 700 is arranged.

In the gas cylinder system having such a structure, the bearing member 500 of the present invention is installed at the lower end of the piston rod 610. Reference numeral 620 is an elastic member disposed on the bearing support to absorb shocks and to exhibit proper elasticity during vertical movement of the working fluid.

Since the operation of the gas cylinder method is well known, it will be omitted. However, only the bearing member 500 of the present invention will be described. When the working fluid 700 pushes down the piston 608, the lowering force is the piston rod 610. The bearing member 500 of the present invention is formed of a single member and a single material, so that the elastic member installed while being in contact with it while sufficiently enduring the descending force Sliding resistance is exerted with the member 620 to enable rotation.

Other operations in the gas cylinder system are the same as in the case of the screw spindle system, and will be omitted below.

As described above, according to the bearing member for a swivel chair of the present invention, the bearing member can be made of a single material, so that the bearing member is excellent in durability and manufacturability, and the number of balls and bearing supports can be reduced, which is advantageous in cost reduction. Since grease flow grooves are formed, grease is smoothly supplied to the bearing member in spite of frequent use to protect parts and increase comfort of rotating chair.

Claims (10)

At least a spindle mounted in an outer cylinder, a cushioning elastic member and bearing support and bearing member embedded in the spindle, a screw nut and clutch having protrusions and grooves, a screw shaft, and a fixing member and seat plate for fixing the screw shaft. In a screw spindle for a rotating chair comprising a screw shaft stopper formed on the screw shaft to prevent a rise, The bearing member is a bearing member for a swivel chair, characterized in that made of a single material and a single component. 2. The bearing member of claim 1, wherein the bearing member comprises a circular outer body and a circular inner body, wherein the circular outer body and the circular inner body are integrally formed by a joint member, and portions other than the joint member are filled with grease. Revolving chair bearing member, characterized in that consisting of a grease charging portion. The bearing member for a swivel chair according to claim 1, wherein the joint member is set smaller than the height of the circular outer body and the circular inner body. The bearing member for a swivel chair according to claim 1 or 2, wherein the bearing member is any one selected from a hard synthetic resin material or Teflon or FRP. The bearing member for a swivel chair according to claim 2, wherein a grease flow groove is formed on an upper surface of the grease filling part for smooth flow of the grease. An outer cylinder having at least a circular shape, a cylinder protector provided in the outer cylinder, a cylinder closely mounted in the cylinder protector, an airtight member provided on the upper cylinder, a working fluid filled in the cylinder, and a lower cylinder installed In the bearing member for a rotating chair comprising a piston rod having a piston and a bearing member provided on the piston rod, The bearing member is a bearing member for a swivel chair, characterized in that made of a single material and a single component. 7. The bearing member of claim 6, wherein the bearing member comprises a circular outer body and a circular inner body, wherein the circular outer body and the circular inner body are integrally formed by a joint member, and portions other than the joint member are filled with grease. Revolving chair bearing member, characterized in that consisting of a grease charging portion. 8. The bearing member for a swivel chair according to claim 7, wherein the joint member is set smaller than the height of the circular outer body and the circular inner body. The bearing member for a swivel chair according to claim 6 or 7, wherein the bearing member is any one selected from a hard synthetic resin material or Teflon or FRP. 8. The bearing member of claim 7, wherein a grease flow groove is formed on an upper surface of the grease filling part for smooth flow of the grease.