US46648A - Improved extension-ladder - Google Patents

Description

UNrTED STATES PATENT OFFICE.

`CALVIN EATON, OF WEBSTER, NEW YORK.

IMPROVED EXTENSION-LADDER.

Specification forming part of Letters Patent No. 46,618, dated March 7, 1865.

To @ZZ whom it may concern,.-

Be it known that I, CALVIN EATON, of Webster, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Extension-Ladders; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanyin g drawings, makinga part of this specification, in which- Figure l is an elevation of an extensionladder containing my invention. Fig. 2 is an inside view of that portion of the principal splice described. within the red lines o in Fig. l. Fig. 3 is a side view ofthe top of one rail, showing its disk or friction-roller fr', and the red lines D representing a temporary splice.

Similar letters of reference indicate like parts in the several gures.

This invention relates to that class called extel'lsion-ladders and it consists in making the upper section narrow enough to move freely between the rails of the lower section, and in providing the top of each upper rail with a suitable friction-roller; also, in the peculiar construction of a temporary splice to be applied to the top ofthe upper section.

To enable others to work my invention, I will describe its construction and operation.

A and A in the drawings represent the rails of the lower section; B and B', those of the upper section; O, the crank of the windlass. The rails A and Al are spread at the foot, as shown in Fig. l, so as to constitute a lateral brace to steady it while in use. The metallic clips c are attached rigidly to the inner face ofthe rails A and A', and they are so bent as to just clasp the edge of the rails B and B and leave rooinfor them to slide freely between the hooks thus formed and the rounds of the lower section.

The hook It is hinged to a round near thek lower end of the upper section, and the space between that round and the next one above it should be somewhat greater than the others, whereby when the other double rounds are in a proper relative position the hook shall have more of a draft and a less crushing strain or tendency than it otherwise would have upon the parts. The pulley'block p is suspended from the upper round of the lower tra length is required. The foot of the rails of this section are split, as seen in Fig. 3, so that they may be slipped over the two top rounds of the upper section 'of the ladder proper, and a strap may be buckled around the parts on each side at the point i; or a cord may be applied, or a small bolt may be put through the points of the split rails at i. The several sections may be made of any desired length.

This ladder, while folded, may be raised against a brick or stone wall, or a clapboarded building and the extension run up with perfect ease, the frictionrollers r ett'ectually preventing the ends of the rails from catching.,

By making the upper section to t between the rails of the lower one the ladder is rendered much stiffer and stronger and more compact and portable, also less top'heavy, than A OALVIE EATON.

' Witnesses:

WM. S. LoUGHBoRoUGH,

ASA H. BILLlNcs.

Images