The Thistle were worthy of their three points following their disciplined and dominant performance over West Lothian rivals, Whitburn.
The first half ended on a stalemate with few chances created by either side.
Following the break, Thistle scored three fine goals. A 20 yard strike, in off the bar from Maxwell; a well worked effort from Orr, blasting in from close range; and Swords calmly converting from 18 yards after a Jamie McLean lay off.
Thistle now face Penicuik United on Saturday in another tough league encounter.