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Generated: December 15, 2017

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Details for Patent: 4,955,344

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Summary for Patent: 4,955,344

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)
Application Number:07/374,836
Patent Claim Types:
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Device;

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Foreign Priority and PCT Information for Patent: 4,955,344

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan63-166317Jul 4, 1988

International Patent Family for Patent: 4,955,344

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Germany68927298► Subscribe
Germany68929088► Subscribe
European Patent Office0353799► Subscribe
European Patent Office0505013► Subscribe
European Patent Office0628665► Subscribe
Japan2831377► Subscribe
JapanH02146244► Subscribe
South Korea940001934► Subscribe
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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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