Caster having smooth 180? reverse rotation

Abstract

The present invention relates to a caster, and particularly, to a caster which more smoothly rotates when reversely rotating 180? and effectively supports a weight of an object disposed on the caster to smoothly rotate in reverse without any shaking, wherein the caster has a structure in which a central portion, a connecting part, and a lower body part are sequentially provided under a support plate formed in an upper end portion of the caster, and in particular, a rotating part is mounted between the connecting part and the central portion.

Claims

1. A caster which smoothly rotates 180? in reverse, the caster comprising: a support plate (2) formed in an upper end portion of a caster (1); and a central portion (3), a connecting part (4), and a lower body part (5), which are disposed under the support plate (2), are sequentially mounted; wherein the central portion (3) includes an upper pillar part (6) and a lower pillar part (7), and the upper pillar part (6) and the lower pillar part (7) are disposed diagonally, a central portion of the support plate (2) and the upper pillar part (6) are fixed using an upper nut (8), a thrust ball bearing (9) is mounted between the support plate (2) and the upper nut (8), the lower body part (5) and the lower pillar part (7) are fixed using a lower nut (10), and a thrust ball bearing (11) is mounted between the lower body part (5) and the lower nut (10), a thrust ball bearing (12) is mounted between an outer upper surface of the lower body part (5) and an outer lower surface of the central portion (3), the connecting part (4) is mounted on an outside of the support plate (2), a thrust ball bearing (13) is mounted between the support plate (2) and the connecting part (4), a rotating part (20) is mounted between a lower side of the connecting part (4) and an outer side of the central portion (3), a thrust ball bearing (21) is mounted between the connecting part (4) and the rotating part (20), and a thrust ball bearing (22) is mounted between the rotating part (20) and the central portion (3).

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a longitudinal cross-sectional view of an entire conventional caster.

(2) FIG. 2 is a longitudinal cross-sectional view of an entire caster of the present invention.

(3) FIG. 3 is a view illustrating an example in which a wheel, an upper pillar part, and a lower pillar part of the present invention are collinear with each other.

(4) FIG. 4 is a longitudinal cross-sectional view of the caster of the present invention when positioned in an opposite direction.

(5) FIG. 5 is a view of an example in which the wheel, the upper pillar part, and the lower pillar part are collinear with each other when the caster of the present invention is positioned in the opposite direction.

MODES OF THE INVENTION

(6) A support plate 2 formed in an upper end portion of a caster 1, and a central portion 3, a connecting part 4, and a lower body part 5 which are disposed under the support plate 2 are sequentially mounted.

(7) The central portion 3 includes an upper pillar part 6 and a lower pillar part 7, and the upper pillar part 6 and the lower pillar part 7 are disposed diagonally.

(8) A central portion of the support plate 2 and the upper pillar part 6 are fixed using an upper nut 8.

(9) A thrust ball bearing 9 is mounted between the support plate 2 and the upper nut 8 so that the support plate 2 and the upper nut 8 may rotate freely.

(10) The lower body part 5 and the lower pillar part 7 are fixed using a lower nut 10, and a thrust ball bearing 11 is mounted between the lower body part 5 and the lower nut 10.

(11) A thrust ball bearing 12 is mounted between an outer upper surface of the lower body part 5 and an outer lower surface of the central portion 3 so that the lower body part 5 and the central portion 3 may rotate freely.

(12) The connecting part 4 is mounted on the outside of the support plate 2, and a thrust ball bearing 13 is mounted between the support plate 2 and the connecting part 4.

(13) In the present invention, the caster 1 rotates more smoothly when the caster 1 rotates 180? in reverse.

(14) A rotating part 20 is mounted between a lower side of the connecting part 4 and an outer side of the central portion 3, a thrust ball bearing 21 is mounted between the connecting part 4 and the rotating part 20, and a thrust ball bearing 22 is mounted between the rotating part 20 and the central portion 3.

(15) As described above, the caster 1 includes five units including the support plate 2, the central portion 3, the connecting part 4, the rotating part 20, and the lower body part 5, and the five units are interconnected through the six thrust ball bearings 9, 11, 12, 13, 21, and 22.

(16) In the present invention, when central axes between the upper pillar part 6 and the lower pillar part 7 formed in the central portion 3, a plurality of thrust ball bearings 9, 11, 12, 13, 21, and 22, and a wheel are collinear with each other, a large load can be minimized.

(17) In addition, when the caster 1 changes a direction to move in any direction or reversely rotates 180?, the six thrust ball bearings 9, 11, 12, 13, 21, and 22 may move individually so that the caster 1 rotates smoothly to reduce vibrations of the caster 1.

(18) When the caster 1 rotates, the caster may rotate more smoothly and reduce a load generated when rotating to rotate smoothly using a small force.

(19) As described above, since six thrust ball bearings 9, 11, 12, 13, 21, and 22 are mounted, the upper pillar part 6 and the lower pillar part 7 formed in the central portion 3 may allow a state in which the central axes between the thrust ball bearings 9, 11, 12, 13, 21, and 22 and the wheel, which are collinear with each other, are easily changed, and thus, when the caster 1 reversely rotates 180?, the caster 1 can rotate more smoothly.

(20) In addition, since six thrust ball bearings 9, 11, 12, 13, 21, and 22 are mounted to dispersedly support a weight applied from above the caster 1, the durability of the thrust ball bearings can be improved.

(21) A, B, C, and D expressed in FIGS. 3 and 5 represent central axes of components.

(22) A represents a central axis between the thrust ball bearings 12 and 21, B represents a central axis between the upper pillar part 6 and the thrust ball bearings 9 and 22, C represents a central axis between the lower pillar part 7 and the thrust ball bearings 11 and 12, and D represents the central axis of the wheel.