| 摘要 |
A tube-adjusting device includes a tubular guide having a longitudinal line of apertures and a longitudinal groove diametrically opposite to the line of apertures. A tube extends in the tubular guide and has an inner transverse column defining a through-hole aligned with alternative one of the apertures and with the longitudinal groove of the guide. The inner transverse column has a threaded inner wall adjacent to the longitudinal groove. A pin is movable in the through-hole of the inner transverse column, and has a rounded end adapted to engage the apertures of the guide. A thumbscrew has a threaded shank extending into the through-hole in the transverse column through the longitudinal groove, and is threadedly engaged with the threaded inner wall. Additionally, a helical spring is received in the through-hole of the inner transverse column and compressed between the pin and the threaded shank of the thumbscrew.
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