| 摘要 |
The present invention is directed to a self-contained desoldering gun (10) having a built-in vacuum pump (40) operated by a low voltage electric motor (50) which is electrically connected in at least partial series with a heating tip (20). The heating tip reduces the voltage in the circuit and reduces the size of the motor required to operate the pump. In exemplary embodiments, a portion of the heating tip which is not in partial series with the motor is electrically connected in parallel with the motor. In alternate embodiments, the heating tip can include separately formed first and second heating elements, the first heating element being connected in parallel with the motor and the second heating element being connected in series with the motor. In yet other embodiments, a multi-position switch (38) is used.
|
