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The Sally Saw was designed and produced by the Cummings Machine Works around 1946. Compared to today's chainsaws, it may be crude and bulky in appearance. But, for the times it was a well designed and simply constructed machine. Chainsaws had just barely begun to be built, so the Sally Saw filled a niche market, and was apparently well accepted. I say well accepted because, currently it isn't hard to find a Sally Saw in the market places, such as auction websites.
How was it well designed? Let's divide the saw into three basic areas.
The engine is a durable, reliable and well built Lauson RSC. It is a 4-cycle air cooled engine producing 1 or 1.5 hp. I am not sure if Lauson special built the block or already had it and it wasn't yet in their literature, but it had a large round boss on the output shaft side. This was so the clutch cover and shaft tube assembly could bolt up. Otherwise it was a outfitted just like any other RSC. One website documented the Sally Saw as having a Zenith carburetor. But, Lauson also installed Tillotson ML-1B carbs on the RSC's as on this saw. All the online photos show Sally Saws likewise mounted with ML-1B's. Since the engine uses a stream of air to cool itself, it was necessary to put a deflector after the cylinder to protect the operator's hand. Lauson didn't show the dry type air filter mounted on this saw, so I will say it was installed by Cummings. The only type shown in Lauson's engine manual is an oil bath filter which would have spilled its contents when the saw was tipped up or down. Another assumption is that Sally Saws typically came with unbadged engines, in order to prevent people from thinking that this was a Lauson saw. I don't know if Lauson ever made any saws, but they did make many other types of equipment besides engines.
The clutch and drive shaft assembly is very basic, externally. They can be rotated by releasing the clamp on the clutch housing. This is done by means of the tee handle. Rotating allows the operator to use the blade horizontally for felling trees, or vertically for bucking. The clutch is operated by the rear handle which pivots forward or backward to engage and disengage. Both handles have to hand grips for the two blade positions.
The saw head's housing is made of cast aluminum. It contains a drive gear and five idlers. The saw blade is a ring and has square holes around its inner circumference. When the blade is mounted in the head, the drive gear is engaged in one of these square holes. As the engine turns the shaft, the gear turns the blade. The two idlers gears are on the same side as the drive gear, and their teeth also are engaged in the holes on the blade. On the opposite side of the housing, the three idlers are machined as spools. When the housing is closed and bolted, the spools fit over the teeth of the gears, sandwiching the blade in position but allowing it to rotate freely. A very simplistic design, but effective. There is a long brace that protrudes out from the front of the saw head. This locks against the wood as the blade is turning, preventing it from kicking out of the cut. This therefore, indicates the blade turns from bottom to top.
Enjoy the photos. If anyone has any additional information or corrections, please contact me so that I keep this section accurate. My email is firstname.lastname@example.org