Appeal No. 97-1439 Page 9
Application No. 08/417,981
Claim 1 recites a system for adjusting the height of a post.
The system comprises, inter alia, a tubular bottom post, a top
post having a plurality of outer grooves, an expandable stop ring
which is split to facilitate expansion thereof, and a keeper.
Namur discloses an adjustment fixture for wishbone booms of
board-sailing devices. As shown in the top view of Figure 1, the
wishbone boom consists essentially of two main tubes 1 joined
under an acute angle on the mast side by way of a connecting
member 2, and of two end tubes 3 accommodated in a telescope
fashion by the main tubes 1 and joined together by way of an
elastic connecting member 4. As shown in Figure 2, each end tube
3 includes several spaced-apart, indented peripheral grooves 5
which can be engaged by an O-ring shaped locking member 6 of
a locking ring generally denoted by 7, when the wishbone boom is
assembled and is to be adjusted to the length corresponding to
the respective sail. The locking ring 7 is made of rubber or the
like and provides a tight seal between the main tube 1 and the
end tube 3. In the embodiment of the locking ring 7 according to
Figure 2, a cylindrical intermediate annular sleeve 8 adjoins the
O-ring-shaped locking member 6 of the integrally constructed
locking ring 7, and a conical end section 9 constitutes the
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Last modified: November 3, 2007