| 摘要 |
A releasable lock of a tube telescope, variable as to its length, as a column of an office chair, which comprises a cone, and a column tube movable as to its height and having a longitudinal slot at its free lower end. Tongues are supported by the column tube and the cone is pressed in the locking position against the inner face of the tongues. The latter carry a nose member pointing towards the cone, whereby the line of the convex surface of the cone converges in the direction towards a seat of the chair.
|
