The universal wheel includes a base member, a vertical axle, a lift member, and a wheel member. The lift member adjusts the universal wheel's height. A first driving element, a second driving element, and an engaging element are configured on the base member and the wheel member. The first driving element for turning the base member laterally within 360 degrees. The second driving element is for rolling the wheel member around its lateral axle. The engaging element couples or decouples an external shaft with the lateral axle of the wheel member. As such, through the first and second driving elements, and the engaging element, the universal wheel can control a height from the ground and can be rolled forward, laterally, obliquely, turned 360 degrees when standing in place, or in a combination of these operations.

A work vehicle has at least one caster wheel on an end of the work vehicle. In response to a caster locking signal sent via an electrical controller, a solenoid is electrically activated to reversibly move a locking pin in an axial direction, causing transitions between unlocking and locking states. In the unlocking state, the locking pin is pulled away from the engagement surface. In the locking state, the locking pin is pushed towards the pivoting support to engage the locking void when the pivoting support is oriented in a predetermined rotation angle.

A caster wheel assembly for an agricultural implement system includes a frame configured to pivotally couple to a tool bar of the agricultural implement system via a mount, a sub-frame rotatably coupled to the frame, and at least one connecting linkage configured to control movement of the frame relative to the tool bar. The caster wheel assembly also includes a locking assembly, which includes a lock lever movably coupled to the frame, wherein the lock lever comprises a locking element and a release element, a locking structure fixedly coupled to the sub-frame, and a driving element fixedly coupled to the at least one connecting linkage. The locking element is configured to block rotation of the sub-frame relative to the frame while the locking element is engaged with the locking structure, and the driving element is configured to contact the release element as the at least one connecting linkage moves the frame downwardly relative to the tool bar to drive the locking element to disengage the locking structure.

An operating shaft rises and falls by abutting against a cam surface of a cam rotatably built into the upper part of a stem. A swivel-preventing plate part is fixed to the lower end of the operating shaft. An engagement member is fixed to a support yoke and regulates the swiveling by engaging with the swivel-preventing plate part. A brake shoe part is fixed to the lower part of the swivel-preventing plate part and brakes by abutting against a treat surface of a wheel when the operating shaft falls. A link cam causes a link cam to pivot and causes a brake plate to rise and fall by connected to the brake shoe part. A protruding part for braking, by displacement of the brake plate, is capable of engaging with and disengaging from an annular engagement receiving part formed in the inner periphery of the wheel.

A walking frame (100) comprising a walking frame body (110) configured to provide support to a user as they walk across a surface, at least one swivel castor (120a. 120b) coupled to the walking frame body (110) and comprising a wheel (122) configured to contact the surface and rotate and a wheel mount (124) rotatable with respect to the walking frame body (110) to change the orientation of the wheel (122) relative to the walking frame body (110) and allow the user to steer the walking frame (100). The walking frame (100) also comprises an alignment mechanism (130) configured to apply a biasing force to the wheel mount (124) on rotation thereof to bias the wheel (122) into a predetermined orientation relative to the walking frame body (110), wherein the biasing force applied to the wheel mount (124) decreases as the wheel mount (124) rotates away from the predetermined orientation.

An overbed table may have a base support frame with at least three casters and a rechargeable battery. A motor housing with a top wall having an opening may be attached to the base support and a telescoping column that is hollow tubular is attached at a bottom end to the motor housing over the opening to extend upwardly. A linear motor is positioned in the motor housing with a linear motor actuator projecting through the opening and into the telescoping housing wherein an extension member of the linear motor actuator is attached at a top end to a slidable table column member of the telescoping housing. Servo housing is attached at a top end of the slidable table column member with a servomechanism attached in the servo housing positioned for a rotating shaft of the servomechanism to engage a circular bracket attached adjacent to a first end of a table wherein the circular bracket is rotatably engaged with the servo housing. The rechargeable battery is in electrical communication with a control processor of a control panel attached adjacent the first end of the table, to the linear motor and to the servomechanism.

A line striper comprises a sprayer secured to a frame, and a guided wheel assembly rotatably mounted to the frame. The guided wheel assembly includes an adjustment disk with screw notches along its outer diameter, an alignment plate coaxially surrounding and abutting the adjustment disk, alignment screws threaded through the alignment plate to engage screw notches on the adjustment disk, and an antirotation lock. The screws set a rotational alignment of the alignment plate relative to the adjustment disk, and the adjustment disk is coupled via a spindle axle to a guide wheel. The antirotation lock engages a locking feature on the alignment plate, thereby fixing the orientation of the guide wheel relative to the wheeled frame at an angle determined by the rotational alignment.

Art operating shall rises and fails by abutting against a cam surface of a cam rotatably built into the upper part of a stem. A swivel-preventing plate part is fixed to the lower end of the operating shaft. An engagement member is fixed to a support yoke and regulates the swiveling by engaging with the swivel-preventing plate part. A brake shoe part is fixed to the lower part of the swivel-preventing plate pail and brakes by abutting against a treat surface of a wheel when the operating shaft falls. A link cam causes a link cam to pivot and causes a brake plate to rise and fall by connected to the brake shoe part. A protruding part for braking, by displacement of the brake plate, is capable of engaging with and disengaging from an annular engagement receiving part formed in the inner periphery of the wheel.

A lockable swivelable caster provides for an interaction between a centering element and a locking element to pivotally urge the locking element into a locking notch of the centering element such that the locking element is captured by the locking notch to prevent swiveling of the caster wheel.