| 摘要 |
<p>An actuator having a bi-directional spring holder assembly is disclosed. The assembly has a substantially cylindrical housing (42) having a projection (60) formed on a rim of its cylindrical wall (56). The projection (60) is provided with first and second abutments (62, 64) facing in opposite directions along the circumference of the rim (58). A spring (70) is mounted around a shaft which passes through a longitudinal axis of the housing. A first, internal spring end (72) is engaged to the shaft while a second, external spring end (74) projects radially outward of the cylindrical wall (56). The assembly also includes a spring cover (80) provided with a cover abutment (84) which similarly projects radially outward of the cylindrical wall (56). When the holder assembly is assembled, the spring (70) is coiled and the cover abutment (84) pushes against the projection's first abutment (62) while the external spring end (74) pushes against the second abutment (64). The actuator housing is provided with a wall member (48), one side of which forms a stop for the cover abutment (84), while the other side serves as a stop for the external spring end (74). When the gear train is driven, one of the cover abutment (84) and the external spring end (74) abut a corresponding stop, and the entire housing (42) rotates with the output lever, causing the spring to coil. The coiled spring then provides a restoring force, returning the output lever to the neutral position.</p> |
