Knight's Mechanical Encyclopedia, J., Jack-screw.

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19th-Century American

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Jack-screw.

A lifting implement which acts by the rotation of a screw in a threaded socket. In A the screw is double, the portion a turning in b, and the latter in the collar of the base c. The spanner d rotates the nut c and with it the screw b, which climbs out of c and at the same time projects a.

B is a railway-jack, moved by a lever (which is shown broken off), and acting by pawl and ratchet, either throughout a circle or by reciprocation where the position is confined.

C is a traversing-jack which moves the load along by a secondary screw f so that the standard g slips on the ways h.

In another form the screw is rotated by bevelwheel and pinion.

1877.

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Knight's Mechanical Encyclopedia
Knight, Ed.

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Jack-screw.

Knight's Mechanical Encyclopedia Knight, Ed.

This text is part of:

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Table of Contents:

Jack-screw.

Knight's Mechanical Encyclopedia
Knight, Ed.