A load carrying device comprises a load carrying portion, a roller and an inflation arrangement in connection with the roller for selectively inflating the roller from a deflated state to an inflated state and for selectively deflating the roller from the inflated state to the deflated state, the roller rotatable to allow movement of the load carrying device, the roller comprising: an attachment arrangement attaching the roller to the load carrying portion so that the roller provides support to the load carrying portion; and a body for contacting a surface on which the load carrying device is located.

Embodiments of the present disclosure are generally related to a method and apparatus for performing operations in subterranean wellbores. More specifically, the present disclosure provides a novel downhole tractor for use in a wellbore. The tractor includes a body and a plurality of wheels. The wheels are configured to convert rotation of the body into linear motion along the wellbore. In one embodiment, the tractor is hydraulically driven. Additionally, or alternatively, the tractor may be electrically driven. Optionally, rotation of a string of pipe interconnected to the tractor drives the tractor.

Rolling device comprising a housing (11) accommodating a rolling element and a control and communication module comprising a wireless receiver (30) connected to a control device (40) and position means (50) connected to the control device, wherein the rolling device further comprises driving means (60) connected to the control device and the rolling element for driving and controlling the movements of the rolling element according to a first position acquired by the position means and a received wireless signal comprising movement instructions and a second position, power supply means (70) for powering the control and communication module and the driving means, wherein the housing is arranged with an support assembly for bearing the rolling element which is configured for establishing a releasable connection with the housing, and an electrical interface adapted for establishing connection between the rolling element and the control and communication module and the power supply means.

An example article of furniture includes a number of furniture legs having mechanically coupled thereto a respective furniture caster having a rolling component. The furniture casters are movable between (i) an extended position in which their rolling components at least partially extend below bottom surfaces of the furniture legs and (ii) a retracted position in which their rolling components are positioned entirely above the bottom surfaces of the furniture legs. Push-pull cables are mechanically coupled to the furniture casters, and at least one actuator is mechanically coupled to the push-pull cables. When actuated, the actuator applies a pushing force to the push-pull cables, thereby causing the furniture casters to transition from the retracted position to the extended position. When the actuator is not actuated, the pushing force is removed from the push-pull cables, thereby causing the furniture casters to transition from the extended position to the retracted position.

The present invention relates to a running gear having a carrier plate and a first roller, a second roller and a third roller, which are arranged on the carrier plate. Simplified handling and/or increased stability of the running gear is produced if the first roller can rotate about a first rolling axis running parallel to a plane of extent of the carrier plate and the second roller can rotate about a second rolling axis running parallel to the plane of extent and the third roller can rotate about a third rolling axis running parallel to the plane of extent. The invention further relates to an arrangement having at least two such running gears, wherein at least two such running gears are connected to each other.

The present disclosure relates generally to devices and methods which use the mechanical advantage of a lever and fulcrum along with the use of force from a user's body, foot, and leg muscles, to more ergonomically and safely install wheel assemblies on vehicles while keeping the user's back at a more ergonomic angle and allowing for both of the installer's hands to remain free for stabilizing the wheel assembly during installation. The lifting device provides a foot pedal, a lifting pad and a pivot point to position a wheel assembly on a hub and/or wheel studs.

A caster wheel suspension assembly for a wheelchair or the like includes a housing with a clevis portion and a tubular portion; a fork member pivotably mounted in the clevis portion of the housing, the fork member having a pair of fork arms extending from the housing, each of the fork arms terminating in a lower end, the fork member having an upper portion formed as a clevis tang disposed in the clevis portion of the housing; a damping element in the tubular portion of the housing; and a compression adjustment element connected to the clevis pin and extending axially through the damping element. The compression adjustment element is configured to apply an adjustable compressive force to the damping element, and it is further configured to be moved axially within the tubular portion of the housing for adjustment of the compressive force applied to the damping element.

Embodiments of the present application disclose a universal wheel assembly and a smart cleaning device having the same. The universal wheel assembly includes a rotating shaft support and a universal wheel support. The rotating shaft support is configured to be fixed to a predetermined mounting position. The universal wheel support is connected to the rotating shaft support and is rotatable relative to the rotating shaft support. The universal wheel support is provided with a through hole, and the through hole is used for a mounting tool to pass through to fix the rotating shaft support to the predetermined mounting position.

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.

A method and apparatus for positioning a manufacturing tool. A wheel assembly comprises a wheel plate and rollers. The wheel plate has a perimeter and an axis of rotation that is tiltable about a tilt axis. The rollers are arranged near the perimeter of the wheel plate, each of the rollers having an axis of rotation parallel to the tilt axis. An apparatus comprises an upper frame, a lower frame associated with the upper frame, a wedge slideably located between the upper frame and the lower frame, and a force applicator associated with the wedge.