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Poulan was founded as Poulan Saw Co. in 1946 by chainsaw pioneer Claude Poulan in Shreveport, Louisiana. Purchased in late 1950s or early '60 by the Beaird Company, also of Shreveport, it was known as Beaird-Poulan.
A chainsaw's clutch. The chain wraps around a sprocket behind the clutch that turns with the outer drum. The input of the clutch is connected to the engine crankshaft while the output may drive a shaft, chain, or belt. As engine revolutions per minute increase, weighted arms in the clutch swing outward and force the clutch to engage. The most ...
Racing engines often fail at high rotational speeds because mechanical springs are unable to retract the valves quickly enough to provide clearance for the piston. Renault's pneumatic valve technology replaced steel springs with light weight compressed air bellows. These could retract valves more quickly and reduce the possibility of piston ...
One-way bearing combining sprags and bearing rollers in one race Sprags jam when driven and slide when in reverse. A sprag clutch is a one-way freewheel clutch.It resembles a roller bearing but, instead of cylindrical rollers, non-revolving asymmetric figure-eight shaped sprags, or other elements allowing single direction rotation, are used.
Hele-Shaw clutch, sectioned A single pair of plates of the Hele Shaw clutch Section through a stack of plates The Hele-Shaw clutch was an early form of multi-plate wet clutch , in use around 1900. It was named after its inventor, Professor Henry Selby Hele-Shaw , who was noted for his work in viscosity and flows through small gaps between ...
The pressure from the pilot tube to the dome is routed through the actual control pilot valve. There are many designs but the control pilot is essentially a conventional PRV with the special job of controlling pressure to the main valve dome. The pressure at which the control pilot relieves is the functional set pressure of the PORV.
The force of the spring reverses the direction of rotation, so the wheel oscillates back and forth, driven at the top by the clock's gears. Torsion springs consisting of twisted ropes or sinew, were used to store potential energy to power several types of ancient weapons; including the Greek ballista and the Roman scorpio and catapults like the ...
Claude Casper Poulan (1915–1995) of Monroe, Louisiana was the founder of Poulan Chain Saws and the inventor of the bow guide.. In 1944, Poulan was supervising German prisoners cutting pulpwood in East Texas.