Pumps – Motor driven – Fluid motor
Reexamination Certificate
1999-10-22
2001-08-07
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Fluid motor
C060S581000
Reexamination Certificate
active
06270323
ABSTRACT:
BACKGROUND OF THE INVENTION
The conventional power conversion devices fall into two categories, i.e. the electric motor and the internal combustion engine. However, the former requires electric power for operation which is high in cost thereby making it unfit for practical use, while the latter uses the combustion of gasoline or diesel to generate power which will inevitably be accompanied with noise and air pollution.
Therefore, it is an object of the present invention to provide a hydraulic power conversion device which can obviate and mitigate the above-mentioned drawbacks.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a hydraulic power conversion device which can supply steady and smooth power to a driving tool.
It is another object of the present invention to provide a hydraulic power conversion device which will not produce noise and air pollution in use.
The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 4438629 (1984-03-01), Sato et al.
patent: 4543791 (1985-10-01), Burgdorf et al.
patent: 4552414 (1985-11-01), Fujii et al.
patent: 4843819 (1989-07-01), Leiber
patent: 4848848 (1989-07-01), Klein
patent: 5161449 (1992-11-01), Everett, Jr.
patent: 6079209 (2000-06-01), Hsu
A & J
Van Quang
Walberg Teresa
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