US107822A - Improvement in extension ladders - Google Patents

Description

then either secured to the section B close to its lower end, or are passed around' pulleys n u of the same, and secured to each other.

With this arrangement of tackle, the nierewinding of the cords upon the drum 'i will-have the effect of extending or elevating the section B to any required extent, and, in order to extend theA section C simultaneously with the said section B, ,two additional cords, p p, are required. These are secured to the-top of the section A, are passed over pulleys q q at the top of the section B, and are conducted. downward through the grooves d of the latter to a point close to the bottom of the section C, to which they are secured, or are passed around pulleys r, and secured together in the same manner as the cords k 1a.-

The cords p p will be raised by the pulleys q qwhen the section B is elevated, so thata corresponding elevation of the section (l must necessarily follow.

'.lhe catches 71, may, if desired,be employed in connection with the ladder last described, but they are n ot absolutely necessary, as the pawl and ratchet vof the drum t' will preventthe accidental descent of the sections.

The section C is furnished at its upper extremities with wheels or rollers, s s, whchare'intended to rest against the 'wall -of a building when the ladder is being extended, and thus ease ,olf ,and reduce the friction caused by the rubbing ofthe said section against the wall.

The friction between the several sectonsmay also be reduced, and the extending of the ladder facilitated, by the employment of` small wheels, t t, hung' to cross-rods t t" of the sections Aand B, and adapted to ways on the latter section, and on the upper section O.'

Claim.

witnesses. I

4JOHN WILLIAM SCOTT.

Witnesses:

WILLIAM FALLS, l HARRY SMITH.'

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