10 5th basics mechanical movements description and applications

40 and 41. Rotary converted into rotary Motion. The teeth of these gears, ‘being oblique, give a more continuous bearing than ordinary spur gears.

42 and 43. Different kinds of gears for transmitting rotary motion from one shaft to another arranged obliquely thereto.

44 A kind of gearing used to transmit great force and give a continuous bearing to the teeth. Each wheel is composed of two, three, or more distinct spur-gears. The

teeth, instead of being in line, are arranged in steps to give a continuous bearing. This System is sometimes used for driving screw

propellers, and sometimes, with a rack of similar character, to drive the beds of large iron-planing machines.

45. Frictional grooved gearing a comParatively recent invention. The diagram to the right is an enlarged section, which Can be more easily understood.

46. Fusee chain and spring-box, being the prime mover in some watches, particu- larly of Engtish make. The fusee to the right is to compensate for the loss of force of the spring as it ancoils itself, The chain is on the small diameter of the fusee when the watch is wound up, as the spring has then the greatest force.

47- A frictional clutch-box, thrown in and out of gear by the lever at the bottom. This is used for connecting and discon-

necting heavy machinery. The eye of the disk to the right has a slot which slides upon a bong key or feather fixed on the shaft.

48. Clutch-box. The pinion at the top fives a continuous potary motion to the gear below, to which is attached half the clutch, and both turn loosely on the shaft. Wheo

it is desired to give motion to the shaft, the other part of the clutch, which slides upon a key or feather fixed in the shaft, is thrust into gear by the lever.

49. Alternate circular motion of the hori- zontal shaft produces a continuous rotary motion of the vertical shaft, by means of the ratchet-wheels secured to the bevelgeara, the ratchet-teeth of the two wheels being set opposite ways, and the pawls acting in opposite directions. The bevel-gears and ratchet-wheels are loose on the shaft, and the pawls attached to arms firmly secured on the shaft.