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Title:
FLUID DAMPER AND DRIVING TOOL
Document Type and Number:
WIPO Patent Application WO/2019/168076
Kind Code:
A1
Abstract:
This oil damper (91) is provided with: a cylinder unit (93a) which is filled with oil; a piston (93b) which is provided so as to be capable of moving inside of the cylinder unit (93a) and the movement speed of which is controlled with resistance resulting caused by the oil; and a spring (93g) which expands and contracts in accordance with the position of the piston (93b) and which applies to the piston a force corresponding to the amount of expansion and contraction. The cylinder unit (93a) and the piston (93b) are configured from materials with different expansion/contraction ratios depending on temperature change, and the piston (93b) is configured from a material that has a thermal expansion coefficient greater than that of the cylinder unit (93a).

Inventors:
TANAKA Hiroshi (6-6, Nihonbashi Hakozaki-cho, Chuo-k, Tokyo 02, 〒1038502, JP)
Application Number:
JP2019/007713
Publication Date:
September 06, 2019
Filing Date:
February 27, 2019
Export Citation:
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Assignee:
MAX CO., LTD. (6-6 Nihonbashi Hakozaki-cho, Chuo-ku Tokyo, 02, 〒1038502, JP)
International Classes:
F16F9/52; B25C7/00; F16F9/32; F16F9/48
Domestic Patent References:
WO2018159491A12018-09-07
Foreign References:
JPS34006011B1
JPS4843088U1973-06-02
JPS31009060B1
JPS5148590U1976-04-12
JPH08276375A1996-10-22
JPH10156753A1998-06-16
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (Toranomon East Bldg. 10F, 7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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