| 摘要 |
A ratchet assembly includes an elongated shaft, a gear housing, a ratcheting member, and an arm. The elongated shaft can have a gear and be supported by the gear housing to allow rotation about a primary axis of the shaft. The ratcheting member can mount in the housing and be biased toward the gear to engage with the gear hindering relative rotation about the shaft axis in a first direction and allowing rotation about the shaft axis in a second direction opposite the first direction. The ratcheting member can rotatably mount within the housing about a second axis. The arm can couple to the gear housing in a first configuration to provide torque to rotate the housing about the shaft axis in the first direction when the arm is pressed downward. The arm can also be coupled to the gear housing in a second configuration to rotate the housing about the shaft axis in a second direction opposite the first direction when the arm is pressed downward. |
