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:
Aug. 06, 2002
Filed:
Dec. 20, 2000
Abstract
Provided is a road surface friction coefficient measuring method and device for measuring the friction coefficient of road surfaces such as roads and runways, and which can be used by being mounted on a general car. This device has a spindle detachably connected to the wheel of a travelling wheel of a car, a support arm oscillatably connected to the spindle, and a measuring wheel supported rotatably by the support arm. Provided to the support arm are a vertical load generating mechanism for applying a vertical load to be added to the self weight of the measuring wheel , a first detection unit for detecting the vertical load that is applied to the measuring wheel from the road surface, a rotation transmission mechanism for transmitting to the measuring wheel the rotation of the spindle so as to provide a circumferential velocity difference between the travelling wheel and the measuring wheel, and a second detection unit for detecting the rotational resistance incurred by the measuring wheel from the road surface. The road surface friction coefficient is calculated with a computing unit based on the self weight of the measuring vehicle including the detected values of these detection units and the arm.