ALONZO W RUFF
Engineers in York, PA

4275645, Jun 30, 1981

Nov 21, 1979

6/096622

Alonzo W. Ruff - York PA

Expertise Assistance Inc. - York PA

F24F 900

98 36

A closure for a service opening in a wall separating a frozen storage area from a warm area such as a kitchen or a warehouse loading dock includes at least a pair of spaced flexible curtain members. The curtains are fastened at one end to spaced parallel spring-loaded rollers positioned below the opening and are joined at their opposite ends in an elongated nozzle and connected by cables to power operated pulleys or drums positioned above the opening. The drums are declutchable from the power train to permit the spring-loaded rollers to wind up the curtains to open position and the clutch is re-engaged and the power drive actuated to unwind the curtains from the rollers to close the opening. A plenum chamber housing the rollers is pressurized to force warm side air between the curtains and out of the nozzle to create an air curtain across the opening when the curtains are open and during opening and closing cycles. The flow of air also maintains the curtain spacing for insulation purposes; prevents condensation build up and in one embodiment effects a seal between the curtain and vertical guide members which receive the curtain edges.

4122685, Oct 31, 1978

Mar 29, 1977

5/782453

Alonzo W. Ruff - York PA

St. Onge, Ruff & Associates, Inc. - York PA

F25D 2100

62 80

An elevator shaft in a multi-story cold storage warehouse is modified to substantially isolate the atmosphere in the shaft from that in the warehouse and also from the ambient. Small amounts of heat are then added to the shaft and also means to cause positive circulation of the shaft atmosphere to prevent build up of frost and ice on the shaft interior, the elevator car, the cables and other parts within the shaft.