The present invention provides a structure for assembling a snap-on caster of a draw-bar case. The draw-bar case includes a case body and four caster assemblies. The caster assembly includes a caster and an upper positioning cover. The caster includes a mounting pedestal and a universal wheel. Four sides of the case body are each provided with an installation slot. Several insertion plates are disposed on an inner side surface of the upper positioning cover. The installation slot is penetrated to form a through hole that is disposed corresponding to the insertion plate. The installation pedestal is provided with a buckle plate that is disposed corresponding to the through hole. The buckle plate is penetrated to form an insertion hole. Both sides of one end of the insertion plate are each provided with an inverted buckle. The insertion plate is snap-fitted onto the insertion hole after passing through the through hole and the insertion hole sequentially.

A caster unit includes a base member attached to a mobile body; a link mechanism rotatably supported by the base member to be capable of swinging up and down; an axle supported by the link mechanism; and a support mechanism provided between the axle and the base member, the support mechanism being configured to extends/contracts in a direction parallel to a tangent line of a trajectory of the axle that swings by the link mechanism to generate a damping force and a restoring force.

The present invention provides a wheel assembly for a luggage bag. The wheel assembly comprises a mounting plate, a fork, at least one wheel and at least one magnet. The mounting plate is adapted to be configured on a peripheral portion of the luggage bag. The fork extends from the mounting plate and at least one wheel is connected to the fork. The magnet is adapted to be arranged on an inner portion of the luggage bag opposite to the corresponding mounting plate. When the luggage bag is brought into proximity with the mounting plate, the magnet inside the luggage bag is attracted to the mounting plate and securely connects with the mounting plate, thereby fastening the wheel assembly to the luggage bag.

A luggage caster for maintenance and replacement includes a wheel frame, a vertical shaft, and trolley wheels in a clearance fit with the wheel frame. The vertical shaft is configured to rotate axially within a vertical shaft hole of the wheel frame. a bottom end of the vertical shaft defines a riveting hole for forming a riveting flange. A top end of the vertical shaft is provided with a limiting plate that cooperates with the riveting flange to achieve an axial limitation of the vertical shaft in the vertical shaft hole. The top end of the vertical shaft is further provided with an installation head that protrudes from the limiting plate. The installation head is configured to insert into a shaft hole of a luggage bottom support. The riveting hole of the vertical shaft extends axially along the vertical shaft to define an anti-rotation tool hole.

A two-wheel caster includes a rotation shaft component, an arm member provided with a hollow, an axle attached to the arm member, a left wheel and a right wheel attached to the axle. The arm member includes an axle supporting member which is stored in the hollow so as to be movable up and down, and which supports the axle, a compression coil spring which is stored in the hollow, and which pushes the axle supporting member, and a main rib surrounding the hollow. The axle supporting member includes an axle receiving portion which is formed in a tadpole-like shape, corresponds to a head of such a shape, and is provided with a shaft hole through which the axle is inserted, and a cantilever spring portion which corresponds to a tail of the tadpole-like shape, and which is continuous to the main rib.

The present invention provides a structure for assembling a snap-on caster of a draw-bar case. The draw-bar case includes a case body and four caster assemblies. The caster assembly includes a caster and an upper positioning cover. The caster includes a mounting pedestal and a universal wheel. Four sides of the case body are each provided with an installation slot. Several insertion plates are disposed on an inner side surface of the upper positioning cover. The installation slot is penetrated to form a through hole that is disposed corresponding to the insertion plate. The installation pedestal is provided with a buckle plate that is disposed corresponding to the through hole. The buckle plate is penetrated to form an insertion hole. Both sides of one end of the insertion plate are each provided with an inverted buckle. The insertion plate is snap-fitted onto the insertion hole after passing through the through hole and the insertion hole sequentially.

A luggage caster for maintenance and replacement includes a wheel frame, a vertical shaft, and trolley wheels in a clearance fit with the wheel frame. The vertical shaft is configured to rotate axially within a vertical shaft hole of the wheel frame. a bottom end of the vertical shaft defines a riveting hole for forming a riveting flange. A top end of the vertical shaft is provided with a limiting plate that cooperates with the riveting flange to achieve an axial limitation of the vertical shaft in the vertical shaft hole. The top end of the vertical shaft is further provided with an installation head that protrudes from the limiting plate. The installation head is configured to insert into a shaft hole of a luggage bottom support. The riveting hole of the vertical shaft extends axially along the vertical shaft to define an anti-rotation tool hole.

A wheel for a luggage case, including an hub rotatably coupled to the luggage case, an outer rim radially spaced a distance from the hub by a plurality of spokes, and a tread portion positioned around the outer rim for engaging a support surface. At least one of the spokes includes a suspension portion having a shape that is curved around and concave to the axis of rotation. The suspension portion resiliently deflects to absorb impact loads to the wheel.

A caster for a carrier for a carrier mounted on a lower surface of a carrier receiving part, includes: a base part mounted on a lower surface of the carrier receiving part; a body rotatably mounted on the base part based on a rotation shaft; a wheel mounted on the body; a restraining part mounted on the body and selectively restraining the wheel by pressing by the base part rotated when pressing the carrier receiving part down or inclining the carrier receiving part; and a first restoration spring provided between the base part and the body to restore the rotated base part to its original position, where a first shaft mounting hole in which the rotation shaft is mounted is formed in one side of the body and a fixing hole is formed in an upper surface of the other side of the body.