Abstract: A face mask includes a mask shell and a replaceable filter. The mask shell defines a cavity configured to at least partially receive a wearer's nostrils and mouth. The mask shell includes an aperture formed in the mask shell and a flange. The flange is disposed on an inner portion of an edge of the mask shell. The flange is configured to follow a contour of the wearer's face. The flange is configured to contact the wearer's face at least at a nasal bridge portion, a chin portion, a left cheek portion, and a right cheek portion. The replaceable filter is coupled to the mask shell and is configured to cover the aperture.

Abstract: A centerless wheel assembly may include a centerless rim configured to rotate about a point. The centerless wheel assembly may also include a centerless flywheel that may be configured to indirectly couple with the centerless rim and to rotate about a point. The centerless wheel assembly may additionally include a device for rotating the centerless rim in a first direction and in a second direction. The centerless wheel assembly may also include a one-way bearing that may be disposed between the centerless rim and the centerless flywheel. The one-way bearing may be positioned such that as the centerless rim may rotate in the first direction, the centerless flywheel may be caused to rotate in the first direction and as the centerless rim may rotate in the second direction, the centerless flywheel may not be caused to rotate.

Abstract: The present disclosure may relate to a wheelchair that includes a first centerless wheel assembly including a drive roller guide assembly and three other roller guides, and a first drive mechanism coupled to the first drive roller guide assembly to drive the first centerless wheel assembly. The wheelchair may also include a second centerless wheel assembly including a drive roller guide assembly and three additional roller guides, and a second drive mechanism coupled to the second drive roller guide assembly to drive the second centerless wheel assembly.

Abstract: A vehicle is disclosed that may include a vertical axle, a support rod coupled to the vertical axle, and a wheel assembly coupled to the vertical axle via the support rod. The wheel assembly may include a centerless rim, a stationary hub coupled to the support rod and disposed at least partially within the centerless rim, and a roller guide supported by the stationary hub and shaped to roll along the centerless rim. The wheel assembly may be configured to rotate at least one hundred and seventy degrees relative to the vehicle.

Abstract: A ground vehicle may include a platform and a swing arm that may be rotatably coupled to the platform. The swing arm may be configured to move from a first position to a second position by rotating the swing arm about a pivot point on the side of the platform. The pivot point may correspond to where a proximal end of the swing arm couples to the side of the platform. The swing arm may also be configured to move from either the first position or the second position to a third position by actuating the swing arm from the pivot point such that a distal end of the swing arm moves away from the platform to broaden a wheelbase of the ground vehicle. The ground vehicle may also include a centerless wheel assembly coupled to the swing arm.

Abstract: The present disclosure may relate to a pump including a centerless rim, a first roller guide shaped to roll along the centerless rim such that as the first roller guide is rotated, friction between the first roller guide and the centerless rim causes a corresponding rotation of the centerless rim. The pump may also include a second roller guide shaped to roll along the centerless rim, and a plurality of peristaltic rollers coupled to the centerless rim. The pump may additionally include a tube housing disposed proximate the plurality of peristaltic rollers, and a tube disposed between the tube housing and the peristaltic rollers such that as the centerless rim is rotated, the peristaltic rollers compress the tube against the tube housing to create negative pressure within the tube.

Abstract: A centerless wheel assembly may include a centerless rim configured to rotate about a point. The centerless wheel assembly may also include a centerless flywheel that may be configured to indirectly couple with the centerless rim and to rotate about a point. The centerless wheel assembly may additionally include a device for rotating the centerless rim in a first direction and in a second direction. The centerless wheel assembly may also include a one-way bearing that may be disposed between the centerless rim and the centerless flywheel. The one-way bearing may be positioned such that as the centerless rim may rotate in the first direction, the centerless flywheel may be caused to rotate in the first direction and as the centerless rim may rotate in the second direction, the centerless flywheel may not be caused to rotate.

Abstract: The present disclosure includes a transmission comprising a first wheel assembly including a first wheel, a first drive gear coupled to the first wheel such that driving the first drive gear causes a corresponding rotation of the first wheel, and a first motor coupled to the first drive gear to drive the first drive gear. The transmission also includes a second wheel assembly that includes, a second wheel, a second drive gear coupled to the second wheel such that driving the second drive gear causes a corresponding rotation of the second wheel, and a second motor coupled to the second drive gear to drive the second drive gear.

Abstract: A wheel may include a centerless rim with a rail with a driving feature, where the rail protrudes towards a middle of the centerless rim in a first plane. The wheel may also include a stationary hub positioned along a second plane generally parallel with the first plane. The wheel may additionally include a roller guide assembly that includes a support member coupled to the stationary hub and configured to bridge the rail, and first and second roller guides coupled to the support member and positioned to roll along the centerless rim adjacent to and on either side of the rail. The wheel may additionally include a spring positioned to bias the first roller guide against the centerless rim.

Abstract: The present disclosure includes a transmission comprising a first wheel assembly including a first wheel, a first drive gear coupled to the first wheel such that driving the first drive gear causes a corresponding rotation of the first wheel, and a first motor coupled to the first drive gear to drive the first drive gear. The transmission also includes a second wheel assembly that includes, a second wheel, a second drive gear coupled to the second wheel such that driving the second drive gear causes a corresponding rotation of the second wheel, and a second motor coupled to the second drive gear to drive the second drive gear.

Abstract: The present disclosure may relate to centerless wheel assembly that includes a centerless rim including a first center point laying in a first plane generally defined by the centerless rim. The centerless wheel assembly may also include a centerless ring gear coupled to the centerless rim such that rotation of the centerless ring gear causes a corresponding rotation of the centerless rim. The centerless ring gear may include a second center point laying in a second plane generally defined by the centerless ring gear, and the first plane may be generally parallel to the second plane. Additionally, the centerless ring gear may be shaped to interface with a drive gear that drives the centerless ring gear.

Abstract: The present disclosure may relate to a pump including a centerless rim, a first roller guide shaped to roll along the centerless rim such that as the first roller guide is rotated, friction between the first roller guide and the centerless rim causes a corresponding rotation of the centerless rim. The pump may also include a second roller guide shaped to roll along the centerless rim, and a plurality of peristaltic rollers coupled to the centerless rim. The pump may additionally include a tube housing disposed proximate the plurality of peristaltic rollers, and a tube disposed between the tube housing and the peristaltic rollers such that as the centerless rim is rotated, the peristaltic rollers compress the tube against the tube housing to create negative pressure within the tube.

Abstract: The present disclosure may relate to a wheelchair that includes a first centerless wheel assembly including a drive roller guide assembly and three other roller guides, and a first drive mechanism coupled to the first drive roller guide assembly to drive the first centerless wheel assembly. The wheelchair may also include a second centerless wheel assembly including a drive roller guide assembly and three additional roller guides, and a second drive mechanism coupled to the second drive roller guide assembly to drive the second centerless wheel assembly.

Abstract: The present disclosure may relate to centerless wheel assembly that includes a centerless rim including a first center point laying in a first plane generally defined by the centerless rim. The centerless wheel assembly may also include a centerless ring gear coupled to the centerless rim such that rotation of the centerless ring gear causes a corresponding rotation of the centerless rim. The centerless ring gear may include a second center point laying in a second plane generally defined by the centerless ring gear, and the first plane may be generally parallel to the second plane. Additionally, the centerless ring gear may be shaped to interface with a drive gear that drives the centerless ring gear.

Abstract: The present disclosure may relate to centerless wheel assembly that includes a centerless rim including a first center point laying in a first plane generally defined by the centerless rim. The centerless wheel assembly may also include a centerless ring gear coupled to the centerless rim such that rotation of the centerless ring gear causes a corresponding rotation of the centerless rim. The centerless ring gear may include a second center point laying in a second plane generally defined by the centerless ring gear, and the first plane may be generally parallel to the second plane. Additionally, the centerless ring gear may be shaped to interface with a drive gear that drives the centerless ring gear.

Abstract: The present disclosure includes a transmission comprising a first wheel assembly including a first wheel, a first drive gear coupled to the first wheel such that driving the first drive gear causes a corresponding rotation of the first wheel, and a first motor coupled to the first drive gear to drive the first drive gear. The transmission also includes a second wheel assembly that includes, a second wheel, a second drive gear coupled to the second wheel such that driving the second drive gear causes a corresponding rotation of the second wheel, and a second motor coupled to the second drive gear to drive the second drive gear.

Abstract: The present disclosure may relate to a computer readable medium containing instructions that include obtaining a first signal corresponding to an idler roller guide speed, obtaining a second signal corresponding to a tire speed, and obtaining a third signal corresponding to a motor speed. The instructions may also include comparing the idler roller guide speed to an idler threshold based on a relationship between the idler roller guide speed, the tire speed, and the motor speed and comparing the motor speed to a motor threshold based on the relationship. The instructions may additionally include, based on one or both of the idler roller guide speed exceeding the idler threshold and the motor speed exceeding the motor threshold, determining that a slippage has occurred, and in response to the slippage, initiating a corrective action.

Abstract: The present disclosure may relate to a wheelchair that includes a first centerless wheel assembly including a drive roller guide assembly and three other roller guides, and a first drive mechanism coupled to the first drive roller guide assembly to drive the first centerless wheel assembly. The wheelchair may also include a second centerless wheel assembly including a drive roller guide assembly and three additional roller guides, and a second drive mechanism coupled to the second drive roller guide assembly to drive the second centerless wheel assembly.

Abstract: The present disclosure may relate to a wheel that may include first and second exoskeleton plates. The wheel may also include first and second roller guide assemblies that each include one or more bearings, a roller guide coupled with the one or more bearings, and a shaft spanning the first and second exoskeleton plates and coupled with the roller guide such that the roller guide rotates around the shaft. The wheel may also include a tire and a centerless rim coupled with the tire. The centerless rim may be configured to have a shape that corresponds to a shape of the roller guide, and the roller guide may be configured to contact the centerless rim as the centerless rim rotates. The wheel may also include a first limiter to maintain contact between the centerless rim and the roller guide, and a second limiter.

Abstract: The present disclosure may relate to centerless wheel assembly that includes a centerless rim including a first center point laying in a first plane generally defined by the centerless rim. The centerless wheel assembly may also include a centerless ring gear coupled to the centerless rim such that rotation of the centerless ring gear causes a corresponding rotation of the centerless rim. The centerless ring gear may include a second center point laying in a second plane generally defined by the centerless ring gear, and the first plane may be generally parallel to the second plane. Additionally, the centerless ring gear may be shaped to interface with a drive gear that drives the centerless ring gear.