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|Title:||Apparatus for controlling rotational speed of prime mover of construction machine|
|Abstract:||A controller having an up/down switch for changing the rotational speed of a prime mover such as an engine, an actuator such as an electric motor for driving a governor on the basis of the operation of the up/down switch so as to control the rotational speed of the prime mover. A target speed is calculated on the basis of the operation of the up/down switch, and the prime mover speed is controlled by using the calculated value. Another switch is provided to immediately shift the prime mover speed to a speed previously set as desired. This shift switch is used to control the prime mover so that the prime mover rotates at the set speed, and this speed is adjusted by operating the up/down switch.|
|Inventor(s):||Tatsumi; Akira (Chiba, JP), Hirata; Toichi (Ibaragi, JP), Egashira; Masaki (Ibaragi, JP), Tomikawa; Osamu (Ibaragi, JP), Watanabe; Hiroshi (Ibaragi, JP)|
|Assignee:||Hitachi Construction Machinery Co., Ltd. (Tokyo, JP)|
Patent Claim Types:|
see list of patent claims
|Foriegn Application Priority Data|
|Foreign Country||Foreign Patent Number||Foreign Patent Date|
|Japan||63-166317||Jul 4, 1988|
|Country||Document Number||Estimated Expiration||Supplementary Protection Certificate||SPC Country||SPC Expiration|
|Germany||68927298||<disabled in preview>|
|Germany||68929088||<disabled in preview>|
|European Patent Office||0353799||<disabled in preview>|
| This preview shows a limited data set|
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.
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