# US 2014/0189980 A1 · Smart caster having function of preventing free rolling

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- Number: US 2014/0189980 A1
- Document ID: US20140189980A1
- Status: Published application
- Kind: A1
- Application number: 13/737,980
- Filed: 2013-01-10
- Published: 2014-07-10
- Earliest claimed: 2013-01-10
- Assignees: Sunwoong CHOI; Hyunmin BAE; Sooho PYO
- Applicants: Sunwoong Choi; Sooho Pyo; Hyunmin Bae
- Inventors: Sooho PYO
- Web page: https://patentgrep.com/patent/US20140189980A1

## CPC

- B60B 33/0094: {actuated automatically}
- B60B 33/0086: {acting on rim or side portion of tyre}
- B62B 5/0404: {automatic}
- B62B 5/048: {Hub brakes; drum brakes}
- B60B 33/0049: {the rolling axle being horizontal}
- B60B 2200/43: Carts
- B60B 2900/115: Complexity
- B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B62B: HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES (characterised by animal propulsion B62C; propulsion of sledges by driver or engine B62M)

## Abstract

Disclosed therein is a smart caster having a function of preventing free rolling, which prevents a rotation irrelevant to a user's intention in a stopped state. The smart caster includes: a wheel part having a wheel rotatably joined to a wheel shaft and a bearing interposed between the wheel and the wheel shaft; and a braking part rotatably joined to the wheel shaft, the braking part getting in contact with a wheel inner wall in a stopped state to provide braking force to the wheel and releasing a contact state between the braking part and the wheel inner wall in a rolling state of the wheel to remove the braking force of the wheel.

## Claims

### Claim 1

A smart caster having a function of preventing free rolling, the smart caster comprising:
a wheel part having a wheel rotatably joined to a wheel shaft and a bearing interposed between the wheel and the wheel shaft; and
a braking part rotatably joined to the wheel shaft, the braking part getting in contact with a wheel inner wall in a stopped state to provide braking force to the wheel and releasing a contact state between the braking part and the wheel inner wall in a rolling state of the wheel to remove the braking force of the wheel.

### Claim 2 (depends on 1)

The smart caster according to claim 1, wherein the braking part comprises:
a brake shoe having an end portion hinge-coupled to the wheel shaft and rotatably located between the wheel inner wall and the wheel shaft in such a fashion that the brake shoe gets in contact with a wheel inner wall in the stopped state to provide braking force to the wheel and releases a contact state between the braking part and the wheel inner wall in the rolling state of the wheel to remove the braking force of the wheel; and
elastic bodies joined to the wheel shaft and the brake shoe, so that the brake shoe is located at right angles to an axial direction of the wheel shaft in the stopped state of the wheel.

### Claim 3 (depends on 2)

The smart caster according to claim 2, wherein the brake shoe further comprises a brake protrusion protruding on the face getting in contact with the wheel inner wall in a direction of the wheel inner wall and getting in contact with the wheel inner wall so that the brake shoe easily gets in contact with the wheel and the contact state between the wheel and the brake shoe is easily removed.

### Claim 4 (depends on 3)

The smart caster according to claim 3, wherein the brake protrusion comprises a friction member in order to increase the friction force with the wheel inner wall.

### Claim 5 (depends on 3)

The smart caster according to claim 3, wherein the braking part further comprises:
a support ring joined on the shaft of the wheel shaft and hinge-coupled to an end portion of the brake shoe opposed to the wheel shaft, the support ring being joined with the elastic bodies, which elastically support both sides of the brake shoe and the hinge-coupled sides of the support ring.

### Claim 6 (depends on 5)

The smart caster according to claim 5, wherein the support ring comprises:
elastic body supporting portions protruding on both sides where the brake shoe is hinge-coupled.

### Claim 7 (depends on 1)

The smart caster according to claim 1, wherein a pair of the braking parts are joined to both sides of the wheel shaft of the wheel.