Schedule running Functions

I’m trying to schedule a function to be called hourly and set the event when the plugin is activated and remove it when it is deactivated. The function to run is feed_loader(). My code is below. It isn’t running the function so I must be doing something wrong. What is it?

register_activation_hook(__FILE__, 'aggregator_activation');
register_deactivation_hook(__FILE__, 'aggregator_deactivation');

add_action('feed_loader_hook', 'feed_loader');

function aggregator_activation()
{
	wp_schedule_event(time(), 'hourly', 'feed_loader');
}

function aggregator_deactivation()
{
	wp_clear_scheduled_hook('feed_loader');
}