| 摘要 |
The present application relates to a tamper resistant cap (1). The cap (1) has a cover (5) for fitting over an opening, the cover (5) being adapted to be removed from the opening by rotation about a removal axis (A). A drive means (9) is positioned on the cover (5) offset from the removal axis (A) and the cover (5) may be rotated about the removal axis (A) by the drive means (9) to remove the cover (5) from the opening. A sleeve (7) surrounds the drive means (9) at least circumferentially with respect to the removal axis (A), the sleeve (7) being freely rotatable with respect to the cover (5). The cap (1) may be a secure cap for a fire hydrant (3, fig 3). The cover may have a screw thread or bayonet fitting, a tool (33, fig 5) is provided to engage the drive means to remove or install the cap. The sleeve may be mounted on a ball bearing (19) provided between the cover and the sleeve. |
