| 摘要 |
Reset mechanism comprises a base, a spring arm (16) rotatable about an axis through the base (10), and an extendion spring (32) fixed to the base at one end and the spring arm at the other end. The spring passes around two ball bearings (26, 28) on studs on the base to permit use of a long spring in a small space without binding. The spring arm is limited to rotation between first and second angular positions, the angle between the spring and the spring arm becoming more acute as the arm is rotated from the first position (A) to the second position (B). The torque required to hold the arm at the second position is considerably less than the torque required to initiate rotation from the first position. |
