| 摘要 |
<p>HOT STICK WITH AIR CUSHION A telescopic pole having an elongated tubular handle section, an elongated tubular tool section, and one or more intermediate tubular sections. Each of the tool and intermediate sections is slidably telescoped within the next lowermost section and is provided with a manually releasable locking device which coacts with the next lowermost section for holding the sections in a fully extended position. The locking device includes a cylindrical locking member which is sealingly connected to the tubular section on which it is mounted. The locking device is provided with a small bleed hole which provides communication between the interior of the tubular section and the surrounding atmosphere for limiting the escape of air from one tubular section when the adjacent tubular section is being telescopically collapsed therein. The locking member has a cup seal disposed in sliding engagement with the interior of the adjacent tubular section, whereby when the locking member is telescopically collapsed into the adjacent section, the air therein is pressurized and forced outwardly through the bleed hole associated with the other end of said adjacent section. The cup seal also causes any moisture or contamination which collects in the adjacent section to be forced outwardly through the bleed hole.</p> |
