507 Mechanical Movements. Mechanisms and Devices by Henry T. Brown

By Henry T. Brown

This 1868 compendium of inventive mechanisms employs easy drawings to give an explanation for 507 of the small elements that represent advanced equipment. Left-hand pages characteristic illustrations, and dealing with pages provide short descriptions of use and operation. starting from uncomplicated to complicated, the mechanisms contain cranks, pulleys, drills, wheels, and screws.

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The character of this motion may be varied by altering the shape of the teeth or profile of the edge of the rim of the wheel. 137. Expansion eccentric used in France to work the slide-valve of a steam engine. The eccentric is fixed on the crank-shaft, and communicates motion to the forked vibrating arm to the bottom of which the valve-rod is attached. 138. On turning the cam at the bottom a variable alternating rectilinear motion is imparted to the rod resting on it. 139. The internal rack, carried by the rectangular frame, is free to slide up and down within it for a certain distance, so that the pinion can gear with either side of the rack.

The small pulley at the top being the driver, the large, internally-toothed gear and the concentric gear within will be driven in opposite directions by the bands, and at the same time will impart motion to the intermediate pinion at the bottom, both around its own center and also around the common center of the two concentric gears. 58. For transmitting three different speeds by gearing. The lower part of the band is shown. on a loose pulley. The next pulley is fixed on the main shaft, on the other end of which is fixed a small spur-gear.

Used for ore-stampers or pulverizers, and for hammers. 86. A method of working a reciprocating pump by rotary motion. A rope, carrying the pump-rod, is attached to the wheel, A, which runs loosely upon the shaft. The shaft carries a cam, C, and has a continuous rotary motion. At every revolution the cam seizes the hooked catch, B, attached to the wheel, and drags it round, together with the wheel, and raises the rope until, on the extremity of the catch striking the stationary stop above, the catch is released, and the wheel is returned by the weight of the pump-bucket.

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