Damper and method for manufacturing damper

Patent metadata

Field	Value
Publication number	US-10267375-B2
Application number	US-201515529832-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Nov 27, 2014
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A damper (10) includes a housing (11) and a rotor (16) combined with the housing (11) so as to be capable of rotating relative to the housing (11). The damper (10) includes an attenuating medium (90) filled in a rotation area inside the housing (11) wherein the rotor (16) rotates, and added with viscoelasticity by a viscoelasticity treatment; and an enclosure portion (80) provided outside the rotation area of the rotor (16), and communicating with the rotation area.

First claim

What is claimed is:

1. A damper, comprising:
a housing having a rotation area;
a cap covering the housing;
a rotation member combined with the housing so as to turn relative to the housing and cap;
an attenuating medium filled in the rotation area of the rotation member, and added with viscoelasticity by a viscoelasticity treatment; and
an enclosure portion provided radially outside the rotation area, communicating with the rotation area, and enclosing an excess attenuating medium relative to the rotation area to which the rotation member is combined,
wherein the enclosure portion includes a bend structure,
the cap covers the rotation area of the housing and includes annular projecting portions, as a part of the bend structure, radially outside the rotation area, and
the housing further includes two projections, as a part of the bend structure, radially outside the rotation area, and a recess between the two projections so that upon assembly of the damper, the annular projecting portions engage the two projections with the recess to form the enclosure portion separate from the rotation area, the rotation member being sandwiched between the cap and the housing in the rotation area.

2. A damper according to claim 1 , further comprising another enclosure portion enclosing the attenuating medium between the housing and a shaft portion which becomes a rotation center of the rotation member.

3. A damper according to claim 1 , further comprising another enclosure portion between the lid member closing an opening of the housing and a shaft portion which becomes a rotation center of the rotation member.

4. A damper according to claim 1 , applied to a turn structure turning a seat back relative to a seat cushion including a seating surface.

Assignees

• Nifco Inc

Inventors

• Muranaka Makoto

Classifications

• A47C1/02

  Reclining or easy chairs · CPC title

• F16F2224/048

  High viscosity, semi-solid pastiness (F16F2224/041 takes precedence) · CPC title

• F16F9/145 Primary

  involving only rotary movement of the effective parts (wing closers or openers with fluid brakes of the rotary type E05F3/14) · CPC title

• F16F15/1414

  Masses driven by elastic elements (F16F15/145, F16F15/1464 take precedence) · CPC title

• F16F9/003

  Dampers characterised by having pressure absorbing means other than gas, e.g. sponge rubber · CPC title