| 摘要 |
<p>A pre-rinse unit 10 incorporates a normally closed water shutoff valve 14 connected to the lower end 12b of a vertical riser pipe 12 carrying a source of water. An outer tube 24 is rotatably and longitudinally slidable on the riser pipe 12. A pair of rotatable arms 50 are mounted for rotation at one end to the upper end 12a of the vertical riser pipe 12 above the outer tube 24 for rotation about a horizontal axis and the arms 50 carry cams 54 contacting a cam follower ring 34 whose lower surface abuts the outer tube 24. A concentric coil spring 38 surrounding the vertical riser pipe 12 and interiorly of the hollow tube 24, abuts a lower collar 26 fixed to the riser pipe 12, interiorly of the tube 24, at its lower end and its upper end abuts the cam follower ring 34. Stop means 66, 70 carried by the riser pipe 12 limits pivoting of the arms 50. At the outboard end 50b of the arms 50, a hollow sleeve 52 fixed to the arms 50 at right angles thereto slidably receives a flexible hose 20 connected at one end 20a to the upper end 12a of the riser pipe 12, whose opposite end 20b bears a urethane foam insulated handle and spray head assembly 22. A set screw 53 carried by the sleeve 52 adjustably locks the hose 20 to the arms 50 and determines the vertical height position of the spray head 60. A cam 36 fixed to the lower end 24b of the hollow tube 24 contacts a cam follower 82 on a pivotable lever 78 having an end remote from the cam follower 82 which bears on a spring biased plunger 74 of the shutoff valve 14 to automatically open the shutoff valve 14 in response to downward movement of the outer tube 24 upon rotation of the paired arms 50 by pull down of the handle and spray head assembly 22. Automatic termination of water supply occurs upon release of the handle and spray head assembly 22 and reverse rotation of said paired arms 50.</p> |
