US 10,850,338 B2Granted

Electric power tool

AssigneesBosch Power Tools (China) Co., Ltd., Robert Bosch GmbH

InventorWeixin Zheng

Life of this patent

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Abstract

An electric power tool includes a drive device for providing a driving force, a rotation wheel that has a central axis and is driven by the drive device to rotate around the central axis, a spindle that supports a tool holder configured to hold a tool of the electric power tool, a first intermediate member, a second intermediate member, and a counterweight device. The first intermediate member is offset from the central axis of the rotation wheel, and revolves around the central axis when driven by the rotating rotation wheel, while driving the spindle to reciprocate in a first direction. The second intermediate member is driven by the first intermediate member to rotate around the central axis and is disposed to be offset from the central axis of the rotation wheel on the side opposite the first intermediate member. The counterweight device is driven by the second intermediate member.

Claims20

Dependent claims

An electric power tool, comprising:

a drive device;
a rotation wheel configured to be driven by the drive device to rotate around a central axis of the rotation wheel;
a spindle supporting a tool holder, the tool holder configured to hold a tool of the electric power tool;
a first intermediate member disposed on the rotation wheel and configured to drive the spindle to reciprocate in a first direction while being driven by the rotating rotation wheel to rotate around the central axis, the first intermediate member offset from the central axis of the rotation wheel;
a second intermediate member configured to be driven by the first intermediate member to rotate around the central axis, the second intermediate member disposed to be offset from the central axis of the rotation wheel on a side opposite the first intermediate member;
a counterweight device configured to be driven to move by the second intermediate member;
and
a sliding guide fixed relative to a housing of the electric power tool, the sliding guide configured to guide the counterweight device to be driven to move only in the first direction.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/013,832Filed 20 Jun 2018
Priority: CN 2017 1 049315126 Jun 2017
Published: US 2018/0370012 A127 Dec 2018
Granted: 1 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B23D 51/161
Of drives or feed mechanisms for straight tools, e.g. saw blades, or bows: with dynamic balancing
B23D 49/007
Machines or devices for sawing with straight reciprocating saw blades, e.g. hacksaws: jig saws, i.e. machine saws with a vertically reciprocating…
B25D 11/12
Means for driving the impulse member: comprising a crank mechanism
B25D 17/24
Details of, or accessories for, portable power-driven percussive tools: damping the reaction force