It would probably be easier to explain in a hands-on demonstration with props...or you could wade through the Engineer-speak on the patent applications or the Serviceman's Manual.
But I'll give it a KISS shot. (Keep it simple, stupid)
When the bag spring and attached bag 'sled' are folded and latched against the back of the bag chamber with a genuine Electrolux bag with sealed edge inserted, the bag/hose door is latched closed against its spring catch.
According to pre-set launch settings, when the pressure differential created when the motor and fan are spinning suction between the bag chamber and the bleed hole inside the hose coupler intake goes past a certain balance point due to accumulation of dust within the bag closing up pores, this differential exhausts enough air from a large rubber diaphragm that pulls down a floating lever connected to the bag door latch and the launch sled rail.
The door opens first on its coil-sprung hinges and drops flat to the floor at the same time that the interconnected power switch is flipped to OFF by a toggle wire.
The dust-clogged bag now being sealed by residual suction to the rubber seal bag compartment rim, as the motor winds down the suction holding the bag in place lessens to the point that the spring latch, now in a half-cocked position, releases the powerful flat folded spring and shoots the bag support sled down the rail to its stops flinging the loose bag out of the machine.
My record fling was achieved by filling a dust wrapper with a carved styrofoam block, btw)
Each of these automatic actions has a external mechanical override lever so that the door can be opened or the bag ejected with the LX unplugged from the wall socket.
On the first generation LXs without the control dial the single setting was established at the factory then fine-tuned in the purchaser's home.
It was found that different above sea levels and particulate size of the household dust environment could cause the ejection to happen prematurely - Oh My! - before the bag was at full capacity, or not at all after the bag was beyond full.
The quick-fix solution from the Factory or Dealer was the Attic & Cellar Key that jammed the release lever to maximum bag fill.
These keys are scarce as hen's teeth but that's ok since most early LX's were retrofitted by the Servicemen with the control dial mechanism.You were advised to store the key under the power cord plug door on top of the machine. Not all LX's came with the cord re tractor - it was an up-sale option.
The 2nd generation aluminum (later plastic) rotation dial addressed this failure to adapt to the various dust properties throughout the same home so that bags were not wasted unnecessarily and Milady could adjust the trip action as she pleased, from outdoor to basement to main floor to attic, from sea level to Denver heights.
The final version of the LX (model 60), the LX1 (model 61), added features such as rear wheels on the runners and a flip sideways cord winder so that one didn't have to unscrew & remove the cordwinder to access the blower port.
Whew! read over several times.
Dave[this post was last edited: 1/18/2013-17:17]
