Semco Corporation

Thomas Henry Rice

A hole punching machine for use on wet or damp drywall improves ventilation behind the drywall for drying purposes. The machine includes a base position on the floor and against the wall. A pneumatic ram in the base can be extended and retracted to cut a hole in drywall, after any baseboard is removed. The hole can then be covered when the baseboard is reinstalled. The operator can activate the ram using a switch, while standing.

Pneumatic drywall hole punch machine

Air conditioning systems and methods for cooling a space that include a chiller, a cooling coil, a heat sink, various water conduits, and a pump. Different modes of operation are used under different conditions and the water is routed differently in different modes. In a first mode, the chiller rejects heat to water returning from the cooling coil, and in a second mode, there are separate loops of chilled and heated water with separate pumps. In a third (economizer) mode of operation, the chiller is off and water from the heat sink is delivered to the cooling coil. Control valves, check valves, or both, are used to direct the flow of water, which are strategically placed in various water conduits.

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West Des Moines, IA, United States of America

Thomas Henry Rice