A connective unit to connect a roller with a seat's leg is disclosed. The connective unit comprises a supportive arm, a plastic cylindrical member, a pivotally connective member and a roller. The plastic cylindrical member may engage with a cylindrical hole provided in the supportive arm. The upper end of the pivotally connective member may engage with a first connective hole and the lower end of the pivotally connective member may engage with a second connective hole of the roller. Thanks to presence of the plastic cylindrical member, when the pivotally connective member rotates and causes the roller to rotate with it, the supportive arm doesn't have any contact with the pivotally connective member and thus noisy friction and impacts between them as in the prior art may be avoided. Therefore, the plastic cylindrical member is difficult to wear out as the pivotally connective member rotates.

According to the present invention, when a first point (P1) is set on an end edge on an outer end portion (15a) side of a coupling member (15) and a fifth point (P5) is set on an end edge on an inner end portion (15b) side of the coupling member (15), and when a distance (H1) from the fifth point (P5) to the second point (P2) along a reference straight line (RL) passing through the first point (P1) and a tire axis is set to 0.80 times a reference distance (H) from the fifth point (P5) to the first point (P1) along the reference straight line, a distance (H2) from the fifth point (P5) to the third point along the reference straight line is set to 0.65 times the reference distance (H), and a distance (H3) from the fifth point (P5) to the fourth point (P4) along the reference straight line is set to 0.30 times the reference distance (H), the third point (P3) is disposed on the other side in the tire circumferential direction of an overall inclined straight line (SL) passing through the first point (P1) and the fifth point (P5), and a horizontal distance (D2) between the second point (P2) and the third point (P3) in a perpendicular direction (D) perpendicular to the reference straight line (RL) is larger than each of a horizontal distance D1 between the first point (P1) and the second point (P2) in the perpendicular direction (D) and a horizontal distance (D4) between the fourth point (P4) and the fifth point (P5) in the perpendicular direction (D).

The present utility model refers to a rolling device and, more particularly, an improved multi-directional ball caster-type device having an increased slope, which means a smaller angular slope level, or a more acute inclination angle between the central vertical axis of the device and the surface upon which it rolls. The slope, or inclination angle of the present improved device is from 62 to 50, or less. As the inclinations angle can be more acute, the object supported on the rolling system, e.g. a luggage case, can be more sloped without having friction between the main ball involving structure and the ground.

The present utility model refers to a rolling device and, more particularly, an improved multi-directional ball caster-type device having an increased slope, which means a smaller angular slope level, or a more acute inclination angle between the central vertical axis of the device and the surface upon which it rolls. The slope, or inclination angle of the present improved device is from 62 to 50, or less. As the inclinations angle can be more acute, the object supported on the rolling system, e.g. a luggage case, can be more sloped without having friction between the main ball involving structure and the ground.

A pressured braking wheel includes a wheel seat, an axle sleeve, a first wheel rim and a second wheel rim. The wheel seat has an accommodation space and a braking tenon. The axle sleeve is arranged in the accommodation space and sleeves a wheel axle. Inner sides of the first wheel rim and the second wheel rim are respectively annularly provided with first tenon grooves and second tenon grooves. The first wheel rim and the second wheel rim pivotally connect with the axle sleeve through the wheel axle. The first tenon groove and the second tenon groove are arranged under the braking tenon. When the wheel seat is pressed down, the wheel seat inserts the braking tenon into the first tenon groove and the second tenon groove, so as to prevent the first wheel rim and the second wheel rim from rotating with respect to the wheel seat.

A wheel includes a supporting frame, with a central portion having a center around which the wheel can turn, and a plurality of radial portions extending from the central portion angularly displaced with each other. A housing seat is delimited between two adjacent radial portions. A movable element is radially displaceable between a first working position located at a maximum distance with respect to the center, and a second working position located at a minimum distance with respect to the center of the central portion. The radial portions and the movable element have respective distal sections, with respect to the center, curved with a curvature radius corresponding to the curvature radius of the wheel and being flush with each other. A locking element is displaceable between one locking position, wherein it abuts on the movable element and prevents the radial displacement thereof, and one unlocking position, wherein it allows the radial displacement of the movable element toward the second working position. A returning element of the movable element between the supporting frame and the movable element is configured to bring the movable element back into the first working position. A band made of an elastically deformable material surrounds the distal sections of the plurality of radial portions and the movable element, at the circular perimeter of the wheel.

Wheel with an in-wheel suspension system, and suspension member thereof. Wheel includes: stationary member including an axis, rotary member rotatable about the axis, and selective suspension system. The selective suspension system has at least one suspension member positioned between the stationary member and the rotary member, thereby providing a fixed distance therebetween, and retains the fixed distance when stressed up to a threshold value, and recoverably alters the fixed distance when stressed over the threshold value. The suspension member includes: cylindrical housing, piston slidably movable in the cylindrical housing, and compression spring whose first end is connected to the piston and second end is connected to the housing. The compression spring, when fully relaxed or compressed under the threshold value, maintains the housing and piston at a normally fixed distance. Applicable to wheelchairs and bicycles, among other self-propelled and powered vehicles.

A chair lock system for inhibiting a chair from rolling when the chair is occupied includes a chair. A plurality of wheels is rotatably coupled to the chair and each of the wheels may roll along a support surface. Each of the wheels is positioned on the base. A locking unit is coupled to the chair and the locking unit inhibits the wheels from rolling along the support surface when the chair is sat upon.

A wheel connectable to a vehicle. The wheel includes a stationary member having an axis, a rotary member rotatable about the axis, and at least one support member positioned between the stationary member and the rotary member, thereby providing a normally fixed distance therebetween. The support member is adapted to retain the distance when stressed up to a threshold value and to recoverably alter the distance when stressed over the threshold value.

A walking aid device includes a support body inclusive of a plurality of support elements extending toward the ground. Each support element is coupled to a caster and a brake unit. Each brake unit has a clutching surface. The clutching surface controllably clutches a wheel of the caster or the ground to thereby generate friction for stopping the walking aid device.