Hammer tool
AssigneeMakita Corporation
InventorYonosuke Aoki
Life of this patent
Estimating the term…
Abstract
A hammer tool for hammering on a workpiece by a tool bit moving at least linearly in a longitudinal direction of the tool bit, configured so that a hammering element moves toward the tool bit to hits the tool bit by way of air pressure fluctuation in an air chamber when a driving element is moved from a first position to a second position. In addition, the stroke center position of the reciprocating movement of the driving element moved between the first position and the second position is configured to be changeable.
Claims21
A hammer tool which at least linearly drives a tool bit at least linearly in a longitudinal direction of the tool bit and performs a hammering operation on a workpiece, comprising:
- a main body,
- a cylinder which is arranged in the main body and extended in the longitudinal direction of the tool bit,
- a hammering element which drives linearly in the longitudinal direction of the tool bit in the cylinder and hits the tool bit,
- a driving element which is slidably arranged in the cylinder and is configured to move the hammering element, and
- a driving apparatus which drives the driving element,
- wherein the driving element is arranged inside the cylinder such that it reciprocally moves in the cylinder along the longitudinal axis of the cylinder between a first position at which the driving element is most remote from the tool bit and a second position at which the driving element is closest to the tool bit,
- when the driving element is moved from the first position to the second position, the driving element moves the hammering element toward the tool bit and the hammering element hits the tool bit, and
- wherein the reciprocal movement of the driving element has a stroke center position relative to the cylinder between the first position and the second position;
- and
- wherein the driving element and driving apparatus are configured to change the stroke center position.
A hammer tool in which a tool bit drives at least linearly in a longitudinal direction of the tool bit and performs a hammering operation on a workpiece, comprising:
- a main body,
- a cylinder which (1) is arranged inside the main body and (2) has a center axis,
- a hammering element which is slidably arranged within the cylinder,
- a driving element which is slid inside the cylinder and drives the hammering element,
- a connection rod which is connected to the driving element,
- a crank mechanism which is connected to the connection rod and drives a piston as the driving element,
- wherein:
- the driving element has a bottom dead center position in which the driving element is most remote from the tool bit and a top dead center position in which the driving element is closest to the tool bit,
- the connection rod has a longitudinal axis, and
- the cylinder, the driving element and the connection rod are configured such that, at some point when the driving element is between the top dead center position and the bottom dead center position, but not at the top dead center position or the bottom dead center position, the longitudinal axis of the connection rod is parallel to the center axis of the cylinder.
Dependencies are inferred from the claim text.