| 摘要 |
A rotatable hose coupling is provided for use with a pool cleaner, particularly of the type powered by a suction or vacuum source via a flexible vacuum hose or the like connected to the suction side of conventional pool water filtration equipment, wherein the rotatable hose coupling is mounted in-line along the vacuum hose and responds to cyclic pressure differentials to index the hose through a rotational increment each time the filtration equipment is turned on and off. The rotatable hose coupling comprises a tubular plunger having one end received axially and slidably within a cam housing defining an axially opposed and spaced-apart pair of cam surfaces. At least one radially extending cam pin carried by the plunger engages the cam surfaces to rotatably index the cam housing relative to the plunger in response to axial back-and-forth displacement of the plunger within the cam housing. A spring-loaded bellows assembly normally urges the plunger in one axial direction relative to the cam housing when the filtration equipment is turned off, but responds to pressure when the filtration equipment is turned on to displace the plunger in an opposite axial direction relative to the cam housing. The plunger and cam housing are adapted for respective in-line connection along the hose length, typically near a coupling site for connecting the hose to the filtration equipment. |
