The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 1987
Filed:
Apr. 25, 1983
Nobuaki Omata, Yokohama, JP;
Nifco Inc., Awa, JP;
Abstract
An oil type damper comprises a housing formed of a basic member in the shape of a blind tube and a cap, a rotating member and a braking disc adapted to rotate jointly and accommodated within the housing, viscous oil applied to the braking disc, and at least one flexible membrane opposed to the braking disc so as to allow the braking disc to be sealed in the housing as covered with the oil. In this oil damper, when the oil serving to brake the rotary motion of the rotating member connected to a given door expands in volume because of rising temperature, the flexible membrane is deformed under the pressure of the expanded oil enough to absorb the voluminal expansion of the oil and prevent otherwise possible leakage of the oil from the housing.