| 摘要 |
A pipe section (5) can be axially moved along the outer surface of a cylinder (4) causing one of the toothed inner surfaces (10) positioned at both of its ends to engage with the outer teeth located at one of two function selecting rings (8, 9). The mechanism is activated by rotating a button (12) acting on an eccentrically positioned pin carrying a swash plate on a cam (13) at its upper end. The plate is pressed down by a helical spring released by a slight rotation of the button (12) and causing the pin to move along a curved slot.
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