Patent · US Active

Hand-held work implement and process for producing a braking device of a hand-held work implement

US9624993B2 · kind B2 · utility

1Cited by

4References

14Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Norbert Apfel · Waiblingen, DE
Manfred Schumacher · Leutenbach, DE
Ralf Cornelsen · Aspach, DE

Key dates

Filing date	Mar 27, 2014
Grant date	Apr 18, 2017
Priority date	—
Expiry date	Nov 22, 2034

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16D2250/0053
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A hand-held work implement having a tool has a braking device for the tool that includes a brake band which wraps around a brake drum. The brake band and the brake drum undergo friction as they move relative to one another during braking. At least one of the band or drum comprises an austenitic steel, a duplex steel, super duplex steel, a nickel-base alloy or a cobalt-base alloy and has a base body and a marginal layer. The hardness of the marginal layer is approximately 150% to approximately 600% of the hardness of the base body and the carbide proportion in the marginal layer is less than approximately 0.5% by weight. A process for production of the foregoing includes diffusing carbon and/or nitrogen into a marginal layer at a temperature of less than 500° C.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.