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

By Henry T. Brown

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

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Extra resources for 507 Mechanical Movements. Mechanisms and Devices

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77. The vibration of the lever, C, on the center or fulcrum, A, produces a rotary movement of the wheel, B, by means of the two pawls, which act alternately. This is almost a continuous movement. 78. A modification of 77. 79. Reciprocating rectilinear motion of the rod, B, produces a nearly continuous rotary movement of the ratchet-faced wheel, A, by the pawls attached to the extremities of the vibrating radial arms, C, C. 80. Rectilinear motion is imparted to the slotted bar, A, by the vibration of the lever, C, through the agency of the two hooked pawls, which drop alternately into the teeth of the slotted rack-bar, A.

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. 87. A contrivance for a self-reversing motion.

The middle pulley is fast on said shaft, and has a small bevel-gear secured to its hub. Pulley on the right, which, like that on the left, is loose on shaft, carries, transversely, another bevel-gear. A third bevel-gear, loose upon the shaft, is held by a friction-band which is weighted at the end. On moving band on middle pulley a simple motion is the result, but when it is moved to right-hand pulley a double speed is given to shaft. The friction-band or curb on the third bevel-gear is to allow it to slip a little on a sudden change of speed.

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