Patent · US Expired

Handheld portable tool having an internal combustion engine

US4836297A · kind A · utility

10Cited by

2References

13Claims

0Family size

Assignee

Andreas Stihl · DE

Inventors

Wolfgang C. Dorner · Oconomowoc, US
Helmut Lux · Winnenden, DE
Reinhold Fink · Pettenbach, AT

Key dates

Filing date	Dec 19, 1986
Grant date	Jun 6, 1989
Priority date	—
Expiry date	Dec 19, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/2183
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A handheld portable tool has a drive unit connected to the handle via damping elements. The drive unit includes an internal combustion engine having a crankshaft. To reduce the vibration transmitted by the drive unit to the handles, a static or dynamic imbalance of defined position and quantity is provided on the crankshaft of the engine, as a result of which vibration in the handles is considerably reduced. An imbalancing weight may for instance be provided in the fan wheel, so that the crankshaft and its elements are manufactured and balanced in the same manner as before, and only the fan wheel has to be structurally modified.

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