Abstract: A safety system is disclosed for failsafe servicing of areas within an order fulfillment facility. During normal operation, a number of battery-powered robots receive wireless instructions from a management control system (MCS) to transfer items to/from workstations or storage shelves in a multi-level storage structure. The order fulfillment facility may be divided into dynamically configurable service zones. When service is required in a service zone, different safety protocols may be employed based on a determination as to the priority level of service required and/or the estimated length of time service will take. One safety protocol involves physically blocking all access points to a service area with mechanical guards, so that order fulfillment operations may be proceed around the service zone while service is performed.

Abstract: A safety system is disclosed for failsafe servicing of areas within an order fulfillment facility. During normal operation, a number of battery-powered robots receive wireless instructions from a management control system (MCS) to transfer items to/from workstations or storage shelves in a multi-level storage structure. The order fulfillment facility may be divided into dynamically configurable service zones. When service is required in a service zone, different safety protocols may be employed based on a determination as to the priority level of service required and/or the estimated length of time service will take. One safety protocol involves physically blocking all access points to a service area with mechanical guards, so that order fulfillment operations may be proceed around the service zone while service is performed.

Abstract: A crystal growth furnace comprising at least three support pedestals supporting a crucible block and at least one means for stabilizing at least two of the support pedestals is disclosed. The stabilizing means can include support pedestals having a carbon-carbon composite outer layer recessed into the crucible block, a pedestal support system comprising at least one brace for securing at least two of the support pedestals to each other, or both.