Abstract: A tool for lifting open floor gratings and the like provides a solid anchor point on top surface of floor grating to facilitate handling and hoisting the grating. The tool includes a body member having an upwardly biased shaft with a push member with an opening on its upper end and a butterfly hook at its bottom end. During operation, a user pushes down on the push member until it is completely inside the body so that the butterfly hook reaches under the grating. The user then gives a quarter turn to the body member so that the butterfly hook turns and thus becomes wider than the cell of the grating so that it can hook up with two bearing bars as the user releases the push member and the shaft springs back up and the opening gets out of the body. Once this is done, a shackle is installed through the opening, and a steel cable placed therein, ready for lifting and hoisting.

Abstract: A tool for lifting open floor gratings and the like provides a solid anchor point on top surface of floor grating to facilitate handling and hoisting the grating. The tool includes a body member having an upwardly biased shaft with a push member with an opening on its upper end and a butterfly hook at its bottom end. During operation, a user pushes down on the push member until it is completely inside the body so that the butterfly hook reaches under the grating. The user then gives a quarter turn to the body member so that the butterfly hook turns and thus becomes wider than the cell of the grating so that it can hook up with two bearing bars as the user releases the push member and the shaft springs back up and the opening gets out of the body. Once this is done, a shackle is installed through the opening, and a steel cable placed therein, ready for lifting and hoisting.

Abstract: A solar concentrator for concentrating solar radiation toward a solar cell, a concentrated photovoltaic module including a solar concentrator and a solar cell, and a secondary optical element for use in a solar concentrator are provided. The solar concentrator includes a primary optical element for collecting and focusing the solar radiation, and a secondary optical element. The secondary optical element is arranged to receive the solar radiation collected and focused by the primary optical element and includes an input end, and output end, and an adiabatic light guide tapering from the input end toward the output end and configured for concentrating and adiabatically guiding the solar radiation between the input and output ends. Some embodiments of the present invention can be useful in solar photovoltaic applications where it is desirable to provide high acceptance angles while maintaining high concentration and optical efficiency levels.

Abstract: A solar concentrator for concentrating solar radiation toward a solar cell, a concentrated photovoltaic module including a solar concentrator and a solar cell, and a secondary optical element for use in a solar concentrator are provided. The solar concentrator includes a primary optical element for collecting and focusing the solar radiation, and a secondary optical element. The secondary optical element is arranged to receive the solar radiation collected and focused by the primary optical element and includes an input end, and output end, and an adiabatic light guide tapering from the input end toward the output end and configured for concentrating and adiabatically guiding the solar radiation between the input and output ends. Some embodiments of the present invention can be useful in solar photovoltaic applications where it is desirable to provide high acceptance angles while maintaining high concentration and optical efficiency levels.