Transmission of Power by Wire RopesD. Van Nostrand, 1893 - 131 Seiten |
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Seite 10 - ... used in mining regions for transmitting the power of a water-wheel by means of a crank on its main axis, pulling during half its revolution to raise a heavy weight or ' balance bob ' at the remote end of the line of bars ; but a system of draw rods cannot economically be employed in producing rotatory motion at great distances. "In recent days, the idea so clearly seen by Bramah has been realized upon a large scale by Armstrong and others...
Seite 38 - Next pursue the same course with b and 2, stopping, however, within four feet of the first set ; next with e and 5 ; also with c, 3, and d, 6.
Seite 36 - Plate 4), and then bring the open bunches of strands face to face, so that the opposite strands interlock regularly with each other. Secondly. — Unlay any strand, A, and follow up with the strand 1 of the other end, laying it tightly into the open groove left upon unwinding A, and making the twist of the strand agree exactly with the lay of the open groove, until all but about six inches of 1 are laid in and A has become twenty feet long.
Seite 38 - ... pursue the same course with B and 2, stopping, however, within four feet of the first set ; next with E and 5 ; also with C, 3 and D, 4. We now have the strands laid into each other's places with the respective ends passing each other at points four feet apart as shown in Fig.
Seite 130 - ... inches, and a thickness of one twenty-fifth of an inch. This presented two inconveniences. In the first place, on account of its considerable surface, it was liable to be agitated by the winds; and secondly, it soon became worn and injured at the points where it was riveted. It served, however, very well for eighteen months to transmit a twelve-horse power to a distance of eighty metres (266 feet.) A cable was then substituted, and this, first introduced in 1852, is still in good condition.
Seite 86 - That is, the horizontal component of the tension is constant, and the vertical component of the tension at any point is equal to the load between that point and the lowest point.
Seite 38 - ... face, so that the opposite strands interlock regularly with each other. Secondly. — Unlay any strand, A, and follow up with the strand 1 of the other end, laying it tightly into the open groove left upon unwinding A, and making the twist of the strand agree exactly with the lay of the open groove, until all but about six inches of 1 are laid in and A has become twenty feet long. Next cut off A within six inches of the rope (see Fig.
Seite 36 - IK splicing wire rope the greatest care should be taken to leave no projecting ends or thick parts in the rope. Heave the two ends taut, with block and fall, until they overlap each other about twenty feet.
Seite 15 - The wheels are made as light as is consistent with strength, not only for the sake of reducing the inertia of the moving mass and the friction on the axes to a minimum, but for the more important object of -diminishing the resistance of the air. It can hardly be doubted that an abandonment of spokes entirely, and making the pulley a...
Seite 38 - ... C and 3; and lastly with 6 and F. The strands are now all laid in with the ends four feet apart, as shown in Fig. 4. Fifth and Last. The ends must now be secured without enlarging the diameter of the rope. Take two rope slings or twisters (see Fig. 5) and fasten them to the rope as shown in Fig.