Metal graphite grounding brush mainly composed of silver and method for producing same
AssigneeTRIS Inc.
InventorsMitsuo Ikeda, Hirotada Kanagawa, Mitsuhiro Hirota, Yoshihiro Nishimura
Life of this patent
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Abstract
The metal graphite grounding brush including silver is made in slide contact with a peripheral surface of an axle and grounds the axle. The mass ratio between silver and carbonaceous components including a volatile component in the brush is silver above 30% and up to 90% and carbonaceous components less than 70% and down to 10%. When the total of silver and carbonaceous components is made 100%, the volatile component is down to 2.0% and up to 15%. The brush grounds the axle reliably so that noise from a car radio is reduced and has a long service life and mechanical strength.
Claims8
A metal graphite grounding brush comprising a brush main body having silver as one of main components of the brush main body and being configured to be made in slide contact with an axle for grounding said axle,
- wherein a mass composition in the brush main body between silver and carbonaceous components including graphite and a volatile component is silver more than 30 mass % and not more than 90 mass % and the carbonaceous component less than 70 mass % and not less than 10 mass %, and
- wherein a content of the volatile component in the brush main body is not less than 2.0 mass % and not more than 15 mass %, total mass content of silver and the carbonaceous component being 100 mass %.
A method for producing a metal graphite grounding brush comprising a brush main body having silver as one of main components of the brush main body and being configured to be made in slide contact with an axle for grounding said axle, said method comprising:
- a step for mixing and kneading a silver powder, a graphite powder, and a synthetic resin binder, in order to prepare a brush material;
- and
- a step for press-molding said brush material into a press-molded piece of the brush main body,
- such that a mass composition in the brush main body between silver and carbonaceous component comprising graphite and a volatile component derived from the synthetic resin binder is silver more than 30 mass % and not more than 90 mass % and the carbonaceous component less than 70 mass % and not less than 10 mass %, and
- such that a content of the volatile component in the brush main body is not less than 2.0 mass % and not more than 15 mass %, total mass content of silver and the carbonaceous component being 100 mass %.
Dependencies are inferred from the claim text.