| 摘要 |
A linear extendable telescopic chute (10) pivotally mounted on a cement mixer truck (12) by a chute attachment structure (20). Chute (10) includes a first chute section (40) and a plurality of telescopically fitted movable chute sections (74, 76) structured of elongated open frames (78) having liners (86) removably affixed in the bottom interior of each open frame (78). Guide and support rails (70, 84) movably connecting one chute section to another are also preferably readily removable from the chute sections (40, 74, 76) for ease of replacement when worn. Inward and outward movement of the chute sections (40, 74, 76) relative to each other, is power operated through the use of multiple double-acting hydraulic rams (94 or 133) arranged to eliminate the need for long flexible hydraulic hoses. The hydraulic rams (94 or 133), and other powering devices (29, 36) used to move chute (10) up and down or left and right are controllable by way of a remote switching unit ( 18 or 148) used to actuate electric solenoid controlled valves (108) which control the flow of hydraulic fluid. The remote switching unit (18 or 148) cooperatively functions with control valves (108) to allow controllable powered movement of the telescopic chute (10) over a wide range of positions by the human operator while standing adjacent a dispensing end (16) of chute (10).
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