A robotic service device for a robotic picking system grid. The robotic service device can be configured for driving to any location on the grid in order to restart malfunctioning robotic load handling devices or to perform maintenance operations or cleaning in situ. Additionally, the service device may be used to rescue robotic load handling devices operational in the picking system. The robotic service device can include a releasable docking mechanism to enable it to dock and latch on to malfunctioning load handling devices. A deployable, releasable electrical connecting device is shaped to conform to a charging, powering, or battery component of one or more of the load handling devices.

A robotic service device for a robotic picking system grid. The robotic service device can be configured for driving to any location on the grid in order to restart malfunctioning robotic load handling devices or to perform maintenance operations or cleaning in situ. Additionally, the service device may be used to rescue robotic load handling devices operational in the picking system. The robotic service device can include a releasable docking mechanism to enable it to dock and latch on to malfunctioning load handling devices. The service device can also be provided with a cleaning device and camera device to enable a condition of a grid and other robotic devices to be monitored.

A robotic service device for a robotic picking system grid. The robotic service device can be configured for driving to any location on the grid in order to restart malfunctioning robotic load handling devices or to perform maintenance operations or cleaning in situ. Additionally, the service device may be used to rescue robotic load handling devices operational in the picking system. The robotic service device can include a releasable docking mechanism to enable it to dock and latch on to malfunctioning load handling devices. The service device can also be provided with a cleaning device and camera device to enable a condition of a grid and other robotic devices to be monitored.

A method for enabling elevated trains to travel both above as well as below a vertically-tiered pair of tracks by having wheels both in the upper and lower area of the train with the ability to switch from traveling on the upper tracks using lower wheels to traveling on the lower track using tipper wheels, where the said method of switching between upper and lower tracks enables trains to be moved between multiple levels serving as passing loops as well as vertical depots.

A method for enabling elevated trains to travel both above as well as below a vertically-tiered pair of tracks by having wheels both in the upper and lower area of the train with the ability to switch from traveling on the upper tracks using lower wheels to traveling on the lower track using tipper wheels, where the said method of switching between upper and lower tracks enables trains to be moved between multiple levels serving as passing loops as well as vertical depots.

A travelling apparatus, including: a rail; at least one vehicle, for travelling in a direction being along the rail; and a holding structure, for holding a user to stand on the at least one vehicle, with one foot in front of another along the travelling direction, thereby forces produced by the travelling, are applied on one side of the user in relation to the other, thus being safe to the user, thereby diminishing width of the rail.

A track system on which a skater dolly can roll, comprising one or more pairs of rails and one or more rail clamps. Each rail clamp supports one or two pairs of rails. Rails held side-by-side are parallel to each other. Rail clamps can also secure two rails in end-to-end configuration. The distance between rails can be about 5/16 of an inch. The track system can include a skater dolly, the load-bearing wheels of which are angled 20-30 degrees away from vertical to provide clearance past the rail clamps. The skater also has stabilizing wheels that are approximately perpendicular to the load-bearing wheels, and which secure the skater to the rails when the skater is in a non-upright e.g. upside-down orientation. The system can include a motor pulley system that moves the skater along the rails.

A track system on which a skater dolly can roll, comprising one or more pairs of rails and one or more rail clamps. Each rail clamp supports one or two pairs of rails. Rails held side-by-side are parallel to each other. Rail clamps can also secure two rails in end-to-end configuration. The distance between rails can be about 5/16 of an inch. The track system can include a skater dolly, the load-bearing wheels of which are angled 20-30 degrees away from vertical to provide clearance past the rail clamps. The skater also has stabilizing wheels that are approximately perpendicular to the load-bearing wheels, and which secure the skater to the rails when the skater is in a non-upright e.g. upside-down orientation. The system can include a motor pulley system that moves the skater along the rails.

A method for enabling elevated trains for travel both above as well as below a vertically-tiered pair of tracks by having wheels both in the upper and lower area of the train with the ability to switch from traveling on the upper tracks using lower wheels to traveling on the lower track using upper wheels, where the said method of switching between upper and lower tracks enables trains to be moved between multiple levels serving as passing loops as well as vertical depots.

A method for enabling elevated trains for travel both above as well as below a vertically-tiered pair of tracks by having wheels both in the upper and lower area of the train with the ability to switch from traveling on the upper tracks using lower wheels to traveling on the lower track using upper wheels, where the said method of switching between upper and lower tracks enables trains to be moved between multiple levels serving as passing loops as well as vertical depots.