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:
Dec. 22, 2009
Filed:
Sep. 07, 2006
Hiroshi Harada, Shizuoka-ken, JP;
Hiroshi Harada, Shizuoka-ken, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka, JP;
Abstract
A shock absorbing device for a watercraft propeller is provided that can include an outer tube unitarily formed with blades of a propeller. An inner tube can be coupled with a propeller shaft. An intermediate tube can be positioned between the outer tube and the inner tube. A first damping means can be placed between the intermediate tube and the outer tube. A second damping means can be placed between the intermediate tube and the inner tube. One of the damping means can include a rubber damper interposed between the inner tube and the intermediate tube, and an engaging means for limiting an angle range in which the inner tube and the intermediate tube can be rotatable relative to each other to a predetermined angle range. The rubber damper can have a spring constant with which elastic deformation thereof begins at a moment that the propeller shaft initiates its rotation. The other damping means includes a torque limiter (tolerance rings) having a circumferential surface that slips against frictional resistance.