Damper for braking rotation

• US 4,571,773 A
• Filed: 06/08/1984
• Issued: 02/25/1986
• Est. Priority Date: 06/08/1984
• Status: Expired due to Fees

• Current Assignee: Nifco Incorporated 184-1 Maioka-Cho Totsuka-Ku Yokohama-Shi Kanagawa-Ken Japan
• Original Assignee: Nifco Incorporated
• Inventors: Yuda, Takuo
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Wolfe, James L.
• Application Number:
  US06/618,700
• Time in Patent Office: 627 Days
• Field of Search: 16/82, 16/51, 16/86 B, 16/DIG. 9, 16/DIG. 21, 16/225, 16/85, 16/334, 188/290, 188/381, 188/271
• US Class Current: 16/85
• CPC Class Codes: E05F 3/00 Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices construction of non-pneumatic or non-liquid braking devices E05F5/00; friction devices in hinges E05D11/08
• CPC Class Codes: F16F 7/08 with friction surfaces rectilinearly movable along each other F16F7/01 takes precedence ; one of the members being a spring F16F13/02
• CPC Class Codes: Y10S 16/10 Spring actuated checks and closers

Abstract

A rotation-braking damper comprises a housing formed of a cap and a case, a shaft provided at the external end thereof with a toothed wheel and inserted on the internal end thereof into the housing, a disk fastened to the internal end of the inserted shaft, and a lock washer disposed inside the housing as held in contact with the disk. By the lock washer, the shaft in rotation is braked against the cap. The damper of this invention produces a desired braking effect on an opening-closing object such as a lid. The damper can be constructed with a small number of component parts.

Claims

1. A rotation-braking damper, comprising:

a cylindrical housing consisting of a cap at one end provided at the center thereof with an aperture, a fitting piece and a case adapted to be fitted into said cap;

a shaft insertable into said aperture having shoulder means along its length for cooperation with said fitting piece and being rotatable within said fitting piece;

a non-rotatable disk fastened to the leading end of said shaft on a radial plane to the axis of said shaft and inserted home into said housing; and

a spring means for biasing said disk in an axial direction against the other end of said housing to provide braking of said shaft.

2. A damper according to claim 1, wherein said spring means is formed of an annular part containing a plurality of arms radially extended outwardly from the peripheral boundary of said annular part and bent back over one side of said annular part so that said arms are held in spring biasing contact with said disk.

3. A damper according to claim 2, wherein said disk is provided thereon with radially extending raised strips, which interfit with said plurality of radially extending arms in a non-rotatable manner.