| 摘要 |
The present invention provides a tamper-resistant fluid-operated brake actuator (20) having a power spring (88) housed within a head or cap (90) which is attached to a flange case (28) having one or more diaphragms (60,78) or pistons (48,86) responsive to changes of fluid pressure within the brake actuator chambers (50,100). In one embodiment, the head (90) is attached to the flange case (28) by a substantially continuous curvilinear annular metal retaining member (104) which must be inelastically deformed or destroyed in order to remove the head from the flange case, thus rendering tampering more difficult. In another embodiment, the annular metal retaining member (104) of the present invention is integral with the actuator head (90) and is metal-spun or the like onto the flange case (28). The invention extends to a method of securing the head to the flange case. |
