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:
Sep. 12, 2000
Filed:
Jun. 17, 1999
Bahram Berj Kafai, Granada Hills, CA (US);
Other;
Abstract
A lead screw piezo nut positioning device includes coupling and driven members and a piezo nut positioner assembly. The coupling member is secured to an external machine part and received about a lead screw such that the lead screw does not directly drivingly engage and cause movement of the coupling member nor of the external machine part. The driven member is threadably coupled about the lead screw for undergoing coarse movement along the lead screw in response to its rotation. The piezo nut positioner assembly is disposed between the coupling and driven members and received over the lead screw such that the assembly is not directly drivingly engaged nor moved by the lead screw. The assembly is electrically activatable to undergo axial expansion along the lead screw and extends between and interconnects the coupling and driven members such that the position of the external machine part secured to the coupling member can be coarsely adjusted relative to the lead screw via the assembly and coupling member and finely adjusted relative to the lead screw via the coupling member after the rotation of the lead screw and thus the coarse movement of the driven member have ceased. The axial expansion of the piezo nut positioner assembly is proportional to the frequency of an electrical voltage applied to the assembly.