HANDHELD POWER TOOL - POSITEC POWER TOOLS SUZHOU CO LTD

Title:

HANDHELD POWER TOOL

Document Type and Number:

WIPO Patent Application WO/2019/158114

Kind Code:

A1

Abstract:

A hammer impact mechanism (20), a handheld power tool (1) having the hammer impact mechanism, and an attachment having the hammer impact mechanism. The hammer impact mechanism comprises a hammer (200) and a guide member (210) capable of rotating relative to each other, and an energy storage mechanism (231) abutting the hammer. One of the hammer and the guide member is provided with a curved guide portion (233), and the other is correspondingly provided with a conversion member (232). The curved guide portion comprises a plurality of upward sections (232a) and downward sections (232b) corresponding to the upward sections. When the conversion member passes the upward section, the conversion member drives the hammer to overcome the force of the energy storage mechanism to move in a first direction. When the conversion member passes the downward section, the energy storage mechanism drives the hammer to move in a second direction opposite to the first direction to implement an impact. The relative rotational speed of the hammer rotating relative to the guide member is 1000 to 2500 rpm. The ratio of the impact frequency of the hammer to the relative rotational speed is 2 to 4 times per rotation.

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Inventors:

XIE MINGJIAN (CN)
LI JI (CN)
ZHONG HONGFENG (CN)
ZHANG SHISONG (CN)
WU HONGBING (CN)

Application Number:

PCT/CN2019/075127

Publication Date:

August 22, 2019

Filing Date:

February 14, 2019

Export Citation:

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Assignee:

POSITEC POWER TOOLS SUZHOU CO LTD (CN)

International Classes:

B25B21/00

Foreign References:

CN103201074A	2013-07-10
CN101288950A	2008-10-22
TW200817141A	2008-04-16
TW200819250A	2008-05-01

Other References: