The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 2009
Filed:
Jan. 08, 2008
Yongbing Zhu, Nanjing, CN;
Yongbing Zhu, Nanjing, CN;
Chervon Limited, Hong Kong, HK;
Abstract
A power tool having a hollow base member and a motor housing vertically, movably received in the base member. A vertical toothed bar is fixed on an outside wall of the motor housing. A gear shaft is horizontally mounted on the base member and a worm shaft is vertically mounted on the base member. A link gear that engages the toothed bar and a lock gear are both mounted on the gear shaft. The lock gear is axially movable between a first position and a second position and has a tendency to be in the first position. When the lock gear is in the first position, the lock gear engages a worm mounted on the worm shaft and is circumferentially fixed relative to the link gear. When the lock gear is in the second position, the lock gear disengages the worm and is rotatable relative to the link gear.