Handheld work apparatus having a blower tube
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United States of America Patent
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Aug 22, 2017
Issued Date -
May 28, 2015
app pub date -
Nov 24, 2014
filing date -
Nov 22, 2013
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A handheld work apparatus has a blower tube with a blower arranged therein. The blower conveys a working air flow through the blower tube and has an impeller rotatably driven by an electric drive motor. A diffuser is mounted in a stationary manner in the blower tube downstream of the impeller. The motor is arranged in a motor compartment in the blower tube. Downstream of the diffuser, the work apparatus has an extraction opening for cooling air for the drive motor, via which an annular space, formed between the blower tube and the motor compartment, is connected to the motor compartment. The motor compartment has an outflow opening for cooling air arranged upstream of the extraction opening. The extraction opening and the outflow opening are arranged so that during operation the pressure at the extraction opening is greater than the pressure at the outflow opening.
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