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A gear case, also known as a chain case or chainguard, is an enclosure for the bicycle chain and sprocket assemblages commonly employed by utility bicycles. It serves to protect the cyclist from being soiled or trapped in the chain rings and tends to fully enclose the drive train. It may also contain an oil bath to keep the chain lubricated. Modern examples are usually moulded in plastic. Similar devices may be found in connection with chains used on larger vehicles and machinery.
Air and gasoline are mixed in the accelerator carburetor gear-case 55 56
The gear-case is on one side of the frame and the chain on the other, and the frame itself was a marvel of ingenuity misapplied.
Thus encouraged, he set to work to refix the gear-case.
"If anything goes wrong with your gear-case, sell the machine and buy a new one; it comes cheaper."
He then said that while he was about it he would see to the chain for me, and at once began taking off the gear-case.
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