Pneumatic hammer mechanism
AssigneeHilti Aktiengesellschaft
InventorsAlexander John, Reinhard Schulz, Eduard Pfeiffer
Life of this patent
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Abstract
A pneumatic hammer mechanism is disclosed. The hammer mechanism features: a flying mass, which is movable along an impact axis; an impact surface, which limits a movement of the flying mass along the impact axis in the impact direction; an exciting piston, which limits a movement of the flying mass along the impact axis opposite from the impact direction; a pneumatic chamber between the flying mass and exciting piston; and a drive for periodically moving the exciting piston with a stroke along the impact axis. The flying mass is excited to a periodic movement between the impact surface and a minimum approach of the exciting piston. A length ratio of the maximum length of the pneumatic chamber to the stroke is selected as less than 1.55.
Claims7
A pneumatic hammer mechanism, comprising:
- a flying mass which is movable along an impact axis;
- an impact surface which limits a movement of the flying mass along the impact axis in an impact direction;
- an exciting piston which limits the movement of the flying mass along the impact axis opposite from the impact direction;
- a pneumatic chamber disposed between the flying mass and the exciting piston;
- and
- a drive for periodically moving the exciting piston with a stroke along the impact axis, wherein the flying mass is excited to a periodic movement between the impact surface and a minimum approach of the exciting piston;
- wherein a length ratio of a maximum length of the pneumatic chamber to the stroke is less than 1.55 such that an increase in impact energy is achievable due to a deceleration of the flying mass during a second phase of a cycle of the flying mass.
Dependencies are inferred from the claim text.