(57) 5n7 A self-propelled cleaning vehicle (10) comprises matter removal means (18) including
primary brushes (24,26) and an additional or third brush (28). The third brush (28)
is mounted on a brush mounting arm (46) comprising inner (48) and outer arm (50) portions,
pivotally interconnected (52), and controlled by a control linkage (58) interconnecting
them and actuated by a remote actuating ram (72) at the inboard end of the assembly.
The outer arm portion (50) is of telescopic construction for length-adjustment. The
telescoping portion is provided by two parallel rams (98,100). Oil flow to the hydrostatic
motor (104) passes through the rams and their piston rods themselves. The pressure
on the piston is used to telescope the rams (98,100). When the third brush (28) is
in use, contour-following means enables the inboard primary brush to follow the peripheral
contours of a surface it is sweeping without driver intervention. Such automatic contour-following
is activated by driver-controlled selection (113) of a contour-following control mode
which causes the inboard brush to move outwards until it meets, for example, a gutter
profile. Position sensing switches (124A) enable the primary brushes (24,26) to automatically
adopt standard sweeping positions when a non-contour following mode is selected.
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