| 摘要 |
A release key for adjustable track hurdles having telescoping members with a biased detent locking assembly located within a pair of longitudinal telescoping members, wherein the detent extends outwardly through aligned apertures in the telescoping members to selectively lock those members in predetermined longitudinal positions. The key features a pressure plate having inner and outer faces, with the inner face having an inwardly extending release protuberance and shaped portion which corresponds in conformation with at least a portion of the outer surface of the telescoping members. The outer face preferably includes a handle to further facilitate manipulation by the user, and the release protuberance is aligned with the biased detent in use and extends at least partially into the aligned apertures when its inner face is placed in contact with the outer surface of the telescoping members. In a preferred embodiment, the key includes a pair of release protuberances longitudinally spaced along the inner face of the pressure plate at intervals corresponding with spacing between adjustment apertures on the hurdle standards to enable quick adjustment of hurdle heights between predetermined, non-adjacent adjustment apertures. The release key also preferably includes a curved pressure plate having a semicircular shape to correspond with the cylindrical outer tube of hurdle standards, and the handle includes a rounded thumb clasp designed to receive the user's thumb and to enable simultaneous release of the locking pin and grasping of the outer circumference of the adjustable hurdle standard.
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