Patent · US Active

Handheld work apparatus

US10941786B2 · kind B2 · utility

0Cited by

4References

15Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Gerd Densborn · Waiblingen, DE
Harald Schliemann · Waiblingen, DE
Ralf Cornelsen · Aspach, DE
Wolfgang Weissert · Winnenden, DE

Key dates

Filing date	Sep 14, 2018
Grant date	Mar 9, 2021
Priority date	—
Expiry date	Feb 26, 2039

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B63/02
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A handheld work apparatus has a blower wheel. The blower wheel is held via a nut on the shaft in a manner locked against rotation by frictional force. A thread moment of friction is transmittable between the nut and the shaft via a thread section. A first moment of friction is transmittable between the nut and the blower wheel via a first friction contact surface. The first friction contact surface is configured such that, at a minimum tightening torque of the nut, the first moment of friction is greater than the thread moment of friction. As a result, during the operation of the work apparatus when there is a relative movement between the blower wheel and the shaft, the blower wheel moves the nut along therewith. The nut retensions the blower wheel against the shaft. The second friction contact surface runs conically with respect to the rotational axis.

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