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A Hills Hoist is a height-adjustable rotary clothes line, designed to permit the compact hanging of wet clothes so that their maximum area can be exposed for wind drying by rotation. They are considered one of Australia's most recognisable icons , and are used frequently by artists as a metaphor for Australian suburbia in the 1950s and 1960s.
For a simple line drying arrangement (rope and clothes pins) the repair and replacement costs are about $20.00 per 1,000 loads of laundry or 2 cents per load. For non-commercial mechanical clothes drying the repair and replacement costs (including labor expenses) are about $200.00 per 1,000 loads of laundry or 20 cents per load.
Gilbert Toyne's final patented rotary clothes hoist design was in 1945 "Improvements relating to hydraulic clothes hoists" (Australian Patent No. 128009) [8] Hydraulic clothes hoists used fluid as a means of raising and lowering the clothes line frame. At least seven hydraulic clothes hoists had been patented in Australia prior to Toyne's design.
Gradually, the electric washing machine's spin cycle rendered this use of a mangle obsolete, and with it the need to wring out water from clothes mechanically. Box mangles were large and primarily intended for pressing laundry smooth; they were used by wealthy households, large commercial laundries, and self-employed "mangle women".
A modern development uses a wooden frame with seven to eleven continuous clothes lines which increase the capacity of the clothes horse. The frame uses a clam cleat to tighten the clothes lines and hangs on four ropes. This increases the necessary installation effort, but also improves safety by increasing redundancy of the suspension.
Rotary vacuum drum filter (RVDF), patented in 1872, [2] is one of the oldest filters used in the industrial liquid-solids separation. It offers a wide range of industrial processing flow sheets and provides a flexible application of dewatering, washing and/or clarification. A rotary vacuum filter consists of a large rotating drum covered by a ...