| 摘要 |
In a preferred embodiment, a seating structure for a dental instrument, provided with a forward port for retractably receiving a dental instrument into the seat and provided with a rearward port for travel of an air tube connected operably to the dental instrument, has an open top with a minor overhang and with a narrowed width at the rearward port, and a forwardly mounted arched channel structure defining a through space of a height sufficient for travel of the air tube above the overhang, and including the air tube with a slidable retainer ring mounted thereon and axially adjustable to and fro to alternate positions as might be desired, with the retainer ring having a width greater than width of the open top adjacent the overhang but of a dimension sufficiently small to be retracted through the forward port into the seat beneath the overhang, the arched channel structure providing a guide track within which the tube may be flipped when the retainer ring is forward of the forward port, in orderto cause the retainer ring to become retracted onto a top of the overhang and rearwardly as the instrument is thereafter retracted into the seat.
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