Title: Control device for the speed control of pneumatic and/or hydraulic working pistons

Abstract: A control device for controlling the speed of power pistons and machine elements driven by the pistons with a signal transmitter coupled to the elements, a pressure transducer producing an output from the transmitted signal having an incrementally variable transmission ratio and a throttle device with a plurality of differently shaped orifices controlled by the transducer output.

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Inventors: Dits, Herbert R. (D-6612 Schmelz, DE, US)

Application Number: 803348
Filing Date: 1977-06-03
Publication_date: 1979-03-20
Assignee:
Primary Class(es): 137/625.3 60/581, 137/625.38, 251/57, 251/206
Other Classes:
US Patent Ref:

2127877	Aug, 1938	Maglott	60/537.
2157707	May, 1939	Keel	91/469.
2194078	Mar, 1940	Simonds	91/405.
2852965	Sep, 1958	Wallace	60/533.
3588076	Jun, 1971	Ammerman	267/127.

Other Refs:
Primary Examiner: Geoghegan, Edgar W.
Assistant Examiner:
Attorney: Cushman, Darby & Cushman