IMPROVED HAND CAR.

[Illustration]

In the accompanying illustration we show a new design of hand car,

being introduced by the Courtright Manufacturing Co., of Detroit. It

will be seen that the apparatus for propelling the car is very

different from the mechanism generally used. An upright framework

secured to the platform carries a large sprocket wheel, which is

connected to a smaller one upon one of the axles by means of a chain.

The larger sprocket wheel is rotated by means of a triangular shaped

lever attached at the lower corner to the crank of the sprocket wheel

and having a handle at each of its upper corners. It is hinged upon a

fulcrum which slides upon the two vertical rods shown in the

illustration. It will be seen that this gives a peculiar movement to

the handles by which the operators propel the car, but it has been

found that the motion is an excellent one, and it is claimed that a

higher speed can be obtained with the mechanism here shown than with

any other now in use. There is practically no dead center, as in the

case where the ordinary crank and lever is used. A number of leading

roads have given the car a trial, and being well satisfied it, have

given orders for more. The company claim that a car with 20 in. wheels

can easily be made to attain a speed of 15 miles an hour by two

men.--_Railway Review_.

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Scientific American Supplement, No. 803, May 23, 1891 · 第 34 / 48 题