Setting tool with a setting depth control
AssigneeHilti Aktiengesellschaft
InventorsChristoph Würsch, Albert Binder, Harald Schmitzer, Wolfgang Zesch
Life of this patent
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Abstract
An explosive powder charge-operated setting tool having a drive piston (4) for driving a pin-shaped nail (5) in a constructional component in a single drive-in step, and a control circuit (I) for controlling a setting depth (T) and including control electronics (7), a set point generator (8) for setting the setting depth (T), a position-determining sensor (9) for determining a position of a lower dead point (uTP) of movement of the drive piston (4), and a regulator (10) for an automatic adjustment of a motion energy of the drive piston; and a method of controlling the setting depth (T).
Claims15
An explosive powder charge-operated setting tool, comprising a drive piston (4), which is driven by an expandable propellant, in a combustion chamber (2), for driving a pin-shaped nail (5) in a constructional component (6) in a single drive-in step;
- and a control circuit (I) for controlling a setting depth (T) and including control electronics (7), a set point generator (8) for setting the setting depth (T), a position sensor (9) for determining a position of a dead point (uTP) of the drive piston (4), and a regulator (10) for an automatic adjustment of a motion energy of the drive piston (4).
A method of controlling a setting depth (T) of a pin-shaped nail (5) driven into a constructional component with a setting tool including a drive piston (4), and a control circuit (1) for controlling a setting depth (T) and including control electronics (7), a position-determining sensor (9) for determining a position of a lower dead point (uTP) of the drive piston (4) which is correlated with the setting depth, and a regulator (10) for an automatic adjustment of a motion energy of the drive piston (4) the method comprising the steps of:
- initiating a drive-in process;
- numerically determining a position of the drive piston during the drive-in process with the position sensor (9) and determining a position of a lower dead point (uTP) of the movement of the drive piston (4) in response to signals generated by the position-determining sensor (9);
- generating, based on the position of the lower dead point (uTP) and a set value of the setting depth (T), a control variable for a following drive-in process;
- temporary storing the control variable as a setup for a following drive-in process;
- adjusting motion energy of the drive piston (4) the regulator (10) in accordance with the stored control variable;
- and
- effecting the following drive-in process.
Dependencies are inferred from the claim text.