US430885A

US430885A - Island

Info

Publication number: US430885A
Authority: US
Publication date: 1890-06-24
Anticipated expiration: 1907-06-24

Description

(No Model.)

0. N. RICHARDSON. EXTENSION LADDER HOOK.

No. 430,885. Patented June 24, 1890.

1 l X 5 N1 1 WITNEEEEEI .Z'N VENTUE:

UNITED STATES PATENT OFFICE.

CHARLES N. RICHARDSON, OF PROVIDENCE, RHODE ISLAND.

EXTENSION-LADDER HOOK.

SPECIFICATION forming part of Letters Patent No. 430,885, dated June 24, 1890. Application filed April 25, 1890! Serial No. 349,431. (No model.)

To all whom it may concern:

Be it known that 1, CHARLES N. RICHARD- SON, of the city and county of Providence and State of Rhode Island, have invented a new and useful Improvement in Hooks for Extension-Ladders; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention has reference to an improvementin the construction of an automatic hook for extension-ladders; and it consists in the peculiar and novel construction of the baseplate, the hook, and the latch, as will be more fully set forth hereinafter.

Extension-ladders as heretofore constructed have been provided with hooks constructed to connect and disconnect two ladders. These hooks,as well as the operating-latch,the spring, and the stop, have each been secured to the sides of the ladder, and as the ladders are exposed to the weather the several parts, and particularly the hooks, are liable to work loose the screw forming the pivotal connection.

The objects of thisinvention are to secure the different parts to a strong firm metal base, construct the latch so as to form the stop for the hook as well as the operating-lever, and to pivot the hook and latch on posts forming part of the plate.

Figure 1 is a side View, and Fig. 2 an edge view, of my improved extension-ladder hook.

In the drawings, the number 4. indicates a metal plate having the raised ends 5,provided with the screw-holes (3. The rim 7 extends from the plate 4 on a line with the ends 5, so that when secured to the side of the ladder by screws passing through the holes 6 a clear space will be between the ladder and the plate 4 for the hook to operate in. The plate at is provided with the rib S. The post 9, on which the latch 10 is pivoted, is held in place by the screw 11-. A shoulder is formed on the base of the post 9 and a washer is placed between the latch 10 and the screw 11 to reduce the friction at these points. The hook 12 is pivoted on the post 13 and is secured by the screw 14:. The spring 15 is wound around the post 16, the short end bearing against the raised end 5 and the longer end against the hook 12.

It will be seen that the latch 10 forms a stop against which the hook 12 is held by the spring 15, and also that when the latch 10 is moved up into the position shown in,Fig. 1 inbroken lines the hook will be forced into the case formed by the plate 4 and the side of the ladder, as shown by the broken lines, and also that the hook will be closed by the latch 10 when in the position shown in broken lines, so that one ladder may slide on the other without engaging with the hook in the same manner as has been done heretofore with extension-ladders provided with automatic hooks.

The hook, the latch, and the spring are all secured to posts forming part of the plate 4. These parts are fastened to the posts by screws, so that the self-contained complete device may be handled or shipped and can be readily secured to a ladder, while the screws, by preventing lateral play, are of some utility, but may be dispensed with if desired. The operation of this class of hooks on extension-ladders is well known, and consists in allowing the upper end of the hook and the latch to slide over the rungs when moved upward and to engage with the rungs when moved downward.

'Having thus described my invention, I claim as new and desire to secure by Letters Patent- In an extension-ladder hook, the combina tion, with the plate provided with the raised ends 5, the rim 7, and the posts 9, 13, and 16, of the hook 12, pivotally secured on the boss 14, the latch 10, pivoted on the post 9 and forming a stop for the spring, and the spring 15, constructed to be secured to the ladder and operate the hook, as described.

CHARLES N. RICHARDSON.

l/Vitnesses:

M. F. BLIGH, J. A. MILLER, J r.