Centrifugally expansible hula hoop |
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| 申请号 | US3729860D | 申请日 | 1972-04-04 | 公开(公告)号 | US3729860A | 公开(公告)日 | 1973-05-01 |
| 申请人 | KARGUL A; | 发明人 | KARGUL A; | ||||
| 摘要 | A circumferentially curved member has its one end portion slidably telescoped in its other end portion and thus forms a closed annulus, the telescoped end portions being relatively slidable with sufficient freedom to permit diametric expansion of the annulus by centrifugal force when the hoop is gyrated by the body of a user. The annulus remains in its expanded position to show its enlargement, more-or-less in relation to the gyrating effort involved in expanding the same. | ||||||
| 权利要求 | 1. A centrifugally expansible hula hoop, comprising a circumferentially curved member having one end portion thereof slidably telescoped in its other end portion and thus forming a closed annulus, the telescoped end portions of said member being relatively slidable with sufficient freedom to permit diametric expansion of the annulus by centrifugal force when the hoop is gyrated by the body of a user, said expansion taking place within the telescoped end portions, releasable means reacting between the slidably telescoped end portions of said member for holding the same in a given relatively slid position corresponding to a given diameter of said diameter annulus, said holding means being self-releasing to permit diametric expansion of the annulus by centrifugal force as aforesaid, said holding means comprising a set of circumferentially spaced notches provided on one end portion of said member, and a resilient tongue provided on the other end portion of said member, said tongue being releasably engageable with said notches. 2. The device as defined in claim 1 together with means for indicating the extent of diametric expansion of said annulus as a function of relative sliding of the telescoped end portions of said member. 3. The device as defined in claim 1 which is further characterized in that said releasable holding means are effective successively step-by-step circumferentially of said annulus. 4. A centrifugally expansible hula hoop, comprising a circumferentially curved member having one end portion thereof slidably telescoped in its other end portion and thus forming a closed annulus, the telescoped end portions of said member being relatively slidable with sufficient freedom to permit diametric expansion of the annulus by centrifugal force when the hoop is gyrated by the body of a user, said expansion taking place within the telescoped end portions, releasable means reacting between the slidably telescoped end portions of said member for holding the same in a given relatively slid position corresponding to a given diameter of said annulus, said holding means being self-releasing to permit diametric expansion of the annulus by centrifugal force as aforesaid, said holding means comprising a set of circum-ferentially spaced notches provided on one end portion of said member, and a resiliently pressed detent provided on the other end portion of said member, said detent being releasably engageable with said notches. 5. The device as set forth in claim 4 wherein said notches and said tongue are slanted in a direction to permit outward expansion of said hoop but will resist inward sliding of said one end portion relative to said other end portion. 6. The device set forth in claim 4 wherein said resiliently pressed detent comprises a resilient integrally hinged tongue formed in said other end, said tongue having a socket formed in the underside thereof; and a ball detent seated in said socket. |
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