The British Shotgun Vol; 2 by Baker & Crudgington, pages 75 & 108 discusses the combination of Perks patent #1968 an Scott Patent 727 of 1885. The objective being to provide assisted opening of the gun.
The Perks patent used cocking rods sliding diagonally upwards from the knuckle to the lockwork, the locks being cocked as the barrels are raised. The Scott patent added compression springs around the cocking rods, combined with "L"shape levers guided in the cocking rods and the action bar. The energy stored in the springs on closing being released when the gun was opened thus through the "thingee" [ one end of the lever] the barrels are given a boost to open!

Roy Hebbes