Electric hand tool implement with no-load stroke disconnection
AssigneeHilti Aktiengesellschaft
InventorHans-Werner Bongers-Ambrosius
Life of this patent
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Abstract
An electrical hand operated tool driving device (1) for producing an at least partially impacting movement of a tool (11) with an air striking mechanism (2) and a no-load stroke disconnection, which scans the no-load stroke position (9) by a sensor (14) and evaluates it with an assigned control unit (15), and in the event of a no-load stroke, lowers the rpm of an energizing driving mechanism (3) over the control unit (15) to a previously fixed reduced rpm.
Claims7
An electrical hand operated tool driving device for producing an at least partially impacting movement of an axially elongated tool (11) driven by an air striking mechanism (2) with a no-load stroke disconnection of the impact in the absence of an axial counter-pressure over the tool (11), said air striking mechanism including a driving mechanism (3), having a range of rpm, a piston (4) connected to said driving mechanism (3), a free piston (6) spaced in the axial direction of said tool (11) from said piston (4), an anvil (7) between said free piston (6) and said tool (11), said free piston (6), said anvil (7) and said tool (11) having a no-load stroke position (9) in the event of a no-load stroke, a housing enclosing said no load stroke position (9), a sensor (14) within said housing for scanning said no-load stroke position, a control unit (15) connected to said sensor (14) for evaluating said sensor whereby, in the event of a no-load stroke, the rpm of the driving mechanism can be lowered to a previously fixed rpm by said control unit (15).
Dependencies are inferred from the claim text.