Water powered lift for speakers apparatus

Details Water powered lift for speakers apparatus Water powered lift for speakers apparatus

1976-10-26

1978-07-18

Mitchell, James C.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

2481882, 2481885, 248404, 187 95, 182148, 272 22, A47B 1900

Patent

active

041010051

ABSTRACT:
A vertically-oriented hydraulic cylinder has its piston rod attached to a pulpit or a lectern that is vertically guided as the piston is actuated. The hydraulic cylinder contains a column of oil in the cylinder between the piston and a supply line connected to the cylinder and coming from a water main such as a city domestic supply. An exhaust line off the supply line exhausts on the piston downstroke to a drain or sump. Each of the supply line and the exhaust line is controlled by a solenoid operating valve electrically connected to a manual switch. Preferably a limit switch located to be actuated at the bottom of the downward travel of the speaker's apparatus closes the exhaust valve before the oil-water interface in the cylinder reaches the cylinder outlet to the supply line. The supply entry of the cylinder may be baffled to reduce water turbulence to preserve the interface between water and oil in the cylinder.

REFERENCES:
patent: 679529 (1901-07-01), Hitchcock
patent: 2573794 (1951-11-01), Kueneman
patent: 3399887 (1968-09-01), Altier

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