Rotary damper having a clutch spring and viscous fluid

• US 4,574,423 A
• Filed: 02/06/1984
• Issued: 03/11/1986
• Est. Priority Date: 02/09/1983
• Status: Expired due to Term

• Current Assignee: Fuji Denki Kk
• Original Assignee: Fuji Denki Kk
• Inventors: Watanabe, Masanori, Ito, Kenji
• Primary Examiner(s): Silverberg, Fred
• Application Number:
  US06/577,007
• Time in Patent Office: 764 Days
• Field of Search: 16/49, 16/51, 16/52, 16/82, 16/85, 16/86 R, 16/86 A, 16/337, 16/342, 16/347, 188/82.1, 188/271, 188/290, 188/291
• US Class Current: 16/85
• CPC Class Codes: E05F 3/14 with fluid brakes of the rotary type
• CPC Class Codes: E05Y 2201/21 Brakes
• CPC Class Codes: E05Y 2201/254 Fluid or viscous friction
• CPC Class Codes: E05Y 2201/266 rotary
• CPC Class Codes: F16F 9/12 Devices with one or more rotary vanes turning in the fluid any throttling effect being immaterial, i.e. damping by viscous shear effect only F16F9/53 takes precedence; pivoting supports for apparatus or articles placed on stands or trestles F16M11/06
• CPC Class Codes: G11B 15/67507 Ejection damping means

Abstract

A rotary damper with a directional property is disclosed which is capable of being simplified in structure, manufactured with a low cost, and stably and precisely operated. The rotary damper is constructed in such a manner that a clutch spring is interposed between a revolving shaft and a rotor to selectively carry out the integral rotation of the rotor with the shaft or the stop of the rotor independent from the shaft.

Claims

1. A rotary damper with a directional property, comprising:

a housing having a bottom;

a rotor rotatably received in said housing, said rotor having a circular recess formed on the upper surface thereof;

a viscous liquid interposed between the bottom of said housing and the lower surface of said rotor to apply a viscous resistance to said rotor;

a revolving shaft having a part thereof rotatably inserted in said recess of said rotor;

clutch means in the form of a coil spring fitted on said part of said revolving shaft in a manner to be interposed between said rotor and said revolving shaft through said recess and form a frictional contact with said revolving shaft;

a cutout formed in said part of said revolving shaft opposite to the upper end of said recess and having one end of said clutch spring securely supported therein; and

friction means comprising a rubber ring interposed between and mutually engaging an annular recess formed at the lower portion of the outer periphery of said rotor and the bottom of said housing.