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. 31, 2006
Filed:
Apr. 12, 2004
Josef Schittl, Thüringen, AT;
Eduard Sever, Ludesch, AT;
Georg Studer, Thüringen, AT;
Marcus Flock, Kaufering, DE;
Guenther Veik, Maeder, AT;
Roland Schaer, Grabs, CH;
Christoph Würsch, Werdenberg, CH;
Josef Schittl, Thüringen, AT;
Eduard Sever, Ludesch, AT;
Georg Studer, Thüringen, AT;
Marcus Flock, Kaufering, DE;
Guenther Veik, Maeder, AT;
Roland Schaer, Grabs, CH;
Christoph Würsch, Werdenberg, CH;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
For the automatic determination of the diameter of a tool, particularly a saw blade for an automatic wall saw, which is driven by a motor via a gear unit, the moment of inertia of the tool is used as an indicator for its diameter. Three basic solution variants are introduced. In particular, the system including a motor, gear unit and tool is treated as a dual-mass oscillator such that the elasticity of the shafts and gears is arranged as a torsion spring between the inertial masses in two discrete points while taking into account two coefficients of friction including coefficients of the known inertia of the motor rotor (Θ) and of the tool (Θ). This system can be described by equations which are then simplified by reasonable assumptions or premises. The selected formulations are solved for the moment of inertia of the tool to determine the diameter therefrom and to make an optimal adjustment for the drive possible which is adapted to the respective tool.