Electively detachably coupled ball joint and pivot cup combination for a wind-propelled surfboard
US4498410A · kind A · utility
Inventor
Key dates
| Filing date | Jul 28, 1982 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Jul 28, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/32688
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention is an electively detachably coupled ball joint and pivot cup combination for electively detachably coupling a mast to a surfboard. The electively detachably coupled ball joint and pivot cup combination includes a pivot cup which is pivotally and rotationally coupled to the surfboard and an annular plate which is disposed on and mechanically coupled to the peripheral edge of the opening of the pivot cup. The electively detachably coupled ball joint and pivot cup combination also includes a spherical member which has been cut into a plurality of sections and which, when not held apart, may be either inserted into or removed from the pivot cup through the annular plate with each of the plurality of sections of the spherical member being loosely coupled to the mast and a sleeve into which the mast is inserted and which is slidably coupled to the mast. A spring resiliently biases the sleeve against the plurality of sections of the spherical member so that the plurality of sections of the spherical member, which are spaced apart, are secured in the pivot cup whereby the application of a force overcoming the resiliently biasing force of the spring moves the sleeve aw…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.