| 摘要 |
A cap lock system for restricting access to a threaded cylindrical end of an access or security device, such as a Schrader valve. An inner lock has a threaded cavity which screws onto an externally-threaded cylindrical end of the Schrader valve. The inner lock itself is received into an open end of an outer cap which captively encloses the inner lock in a manner which allows free rotation between the inner lock and outer cap and prevents the inner lock from being unscrewed. An upper endwall of the outer cap has a keyhole leading into a recessed cavity of the inner lock, with the recessed cavity surrounded by an annular wall. A key is provided for locking and unlocking the inner lock from the Schrader valve. The key has a pivot shaft which is matingly insertable into a section of the keyhole which is configured to support radial loads similar to a journal bearing. A tab connected to a leading end of the pivot shaft is insertable through the keyhole and into the recessed cavity. When the key is turned, the tab is pivotally abutted against the annular flange and the inner lock is wedged against the outer cap. The resulting wedged combination allows torque to be transferred to the inner lock to effect screwing on or off the Schrader valve.
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