A rack-and-wheelbox linkage- paul-ryan.info Wiper arm spindle Cogged wheel Rack Rack tube Union nut Connecting rod Gear wheel Motor casing
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In a rack and wheelbox system, a connecting rod from the gear wheel slides the flexible rack backwards and forwards. The rack tube may curve from the motor to the screen. The wiper arm spindles are mounted on cogged wheels that engage with the rack to provide a swinging motion.

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Servicing the windscreen-wiper mechanism

A pushrod linkage The wiper arm may be held to its spindle by a hexagonal nut, usually hidden by...