Abstract: In a submersible camera housed within a spherical, transparent enclosure with instrumentation for driving the camera to different positions in photographing underwater activity, a cleaning arm is mounted on the external surface of the enclosure and is magnetically driven either by single or multiple drive magnets driven around an interior circular wall of the enclosure; and in the case of multiple drive magnets the cleaning arm has slave magnets in alignment with one or more drive magnets of opposite polarity to cause the cleaning arm to traverse the external surface of the enclosure at periodic intervals one or more cycles each time that the drive magnets are activated.

Abstract: A descent device according to embodiments of the present invention includes a housing; an inlet capstan; a drive wheel coupled to a centrifugal brake, the drive wheel rotatable with respect to the housing about an axis, the drive wheel including a groove formed along its outer perimeter, the groove having a first inner side wall, a second inner side wall, and a bottom, a distance between the first and second inner side walls decreases from the outer perimeter to the bottom in a direction toward the axis, wherein at least a portion of a radial extent of the inner side walls includes a pattern of protrusions positioned between inner side walls to form an irregular rope path along the groove; an outlet capstan; and a rope extending through the rope inlet, around the inlet capstan, around the drive wheel, around the outlet capstan, and through the rope outlet.

Abstract: A descent device according to embodiments of the present invention includes a housing; an inlet capstan; a drive wheel coupled to a centrifugal brake, the drive wheel rotatable with respect to the housing about an axis, the drive wheel including a groove formed along its outer perimeter, the groove having a first inner side wall, a second inner side wall, and a bottom, a distance between the first and second inner side walls decreases from the outer perimeter to the bottom in a direction toward the axis, wherein at least a portion of a radial extent of the inner side walls includes a pattern of protrusions positioned between inner side walls to form an irregular rope path along the groove; an outlet capstan; and a rope extending through the rope inlet, around the inlet capstan, around the drive wheel, around the outlet capstan, and through the rope outlet.

Abstract: A system for overhead anchor evacuation according to embodiments of the present invention includes a support bar configured to extend overhead of a user, a device mount in sliding engagement with the support bar, the device mount slideable along the support bar between a first position in which the device mount is on an inside of an edge of a building, and a second position in which the device mount is on an outside of the edge of the building, wherein the device mount slides freely between the first and second positions during the user's normal use of the system, and a controlled descent device coupled to the device mount.