Abstract: A helmet-mounted tracker and boresighting system incorporated paired receivers on opposing sides of the helmet worn by the user (e.g., left/right, top/bottom) that receive a directional signal from directional transmitters placed at fixed locations throughout the target environment (e.g., a mobile platform, multilevel structure, or simulated environment). Each paired antenna generates an RF signal based on the received directional signal; the paired RF signals are summed to determine the current alignment of the helmet (and head) to the directional transmitter. Alignment information may be used to calibrate or correct inherent drift of the inertial measurement unit (IMU) of the helmet-mounted head tracker.

Abstract: A socket wrench has a body with a handle, and a head with a hollow cavity. A ratchet mechanism is received in the cavity and has a drive shank for connection with a socket. The ratchet mechanism is pivotally connected to the head in order to allow the head to pivot relative to the ratchet mechanism in an arc along a limited path of travel. The pivotal connection between the head and the ratchet mechanism enables an impact force to be presented to the socket when desired. Optionally, a releasable lock member is provided to prevent relative movement of the head and the ratchet mechanism so that the socket wrench can be used in a manner similar to a conventional ratchet wrench.

Abstract: A socket wrench has a body with a handle, and a head with a hollow cavity. A ratchet mechanism is received in the cavity and has a drive shank for connection with a socket. The ratchet mechanism is pivotally connected to the head in order to allow the head to pivot relative to the ratchet mechanism in an arc along a limited path of travel. The pivotal connection between the head and the ratchet mechanism enables an impact force to be presented to the socket when desired. Optionally, a releasable lock member is provided to prevent relative movement of the head and the ratchet mechanism so that the socket wrench can be used in a manner similar to a conventional ratchet wrench.