Abstract: A ball-caster assembly replaces a traditional swivel caster with a central spherical wheel [1] retained by multiple transfer bearings [4] carried on support arms [3] of a support structure [5]. The transfer bearings [4] roll against the spherical wheel [1] to reduce friction and distribute load, allowing the wheel to rotate about any axis and to passively align in the direction of travel. A stability ring [2] may join the support arms [3] to maintain geometry under load. The support structure [5] provides a mounting interface (e.g., stem or plate) for retrofit to a wheelchair or other caster-equipped device. The assembly enables zero-radius turns and smooth direction changes under load while reducing caster flutter and lateral jolts or whiplash. Although optimized for wheelchairs, the mechanism is adaptable to hospital beds, carts, trolleys, and robotic platforms.

Abstract: A collaborative content management system receives, from a client device having access to an account associated with the collaborative content management system, a request for versions of a collaborative document managed by the collaborative content management system. The collaborative content management system accesses a set of versions of the collaborative document. The set of versions includes at least one offline version. The at least one offline version was created on a client device having access to the collaborative document while the client device was disconnected from the collaborative content management system and synchronized to the collaborative content management system when the client device is connected to the collaborative content management system. The collaborative content management system generates a user interface providing the set of versions.

Abstract: A collaborative content management system receives, from a client device having access to an account associated with the collaborative content management system, a request for versions of a collaborative document managed by the collaborative content management system. The collaborative content management system accesses a set of versions of the collaborative document. The set of versions includes at least one offline version. The at least one offline version was created on a client device having access to the collaborative document while the client device was disconnected from the collaborative content management system and synchronized to the collaborative content management system when the client device is connected to the collaborative content management system. The collaborative content management system generates a user interface providing the set of versions.