Pneumatic percussive mechanism
AssigneeHilti Aktiengesellschaft
InventorsAlexander Hoop, Christoph Würsch, Hanspeter Schad, Hans Boeni, Albert Binder
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Abstract
A pneumatic percussive mechanism having an axially reciprocating percussive loaded percussion piston (2), wherein a non-contacting magnetic field sensitive sensor (3) is arranged radial thereto. The percussion piston (2) features at least externally ferromagnetic material and has a plurality of axially separated zones (4) of different magnetic permeability.
Claims15
A pneumatic percussive mechanism with an axially loaded percussive percussion piston (2), comprising a magnetic field sensitive sensor (3) contactless radial arranged therewith, wherein the percussion piston (2) has at least radial external portions thereof formed of a ferromagnetic material and has a plurality of axially spaced zones (4) of different magnetic permeability.
A machine or power tool having a pneumatic percussive mechanism with an axially reciprocating percussive percussion piston (2), wherein the pneumatic percussive mechanism comprises a magnetic field sensitive sensor (3) contact-less radial arranged therewith, wherein the percussion piston (2) at least radial externally comprises ferromagnetic material and the percussion piston (2) has a plurality of axially spaced zones (4) of different magnetic permeability and wherein the sensor (3) is connected to a computer unit (6) for determining at least one of a position and speed of the percussion piston (3) from a temporal trend of the sensor signal.
Dependencies are inferred from the claim text.