US1398622A - Extension-ladder stop - Google Patents

Description

P. BROMAN.

EXTENSION LADDER STOP.

APPLICATION FILED FEB. 7, 1920.

1 3984522. Patented Nov. 29, 1921.

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PETER BROMAN, OF CHICAGO, ILLINOIS, 'ASSIGNOR TO BROWN SAFETY LADDER MFG.

(30., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

XTENSION-LADDER STOP.

Specification of Letters Patent. 7 Patented Nov. 29, 1921.

Application filed February. '7, 1920. Serial No. 356,965.

To aZZ whom it may concern: 7

Be it known that I, PETER BROMAN, a citizen of the United States, residing at 5821 S. Ada St., Chicago, in the county of Cook and State of Illinois, have invented a new and useful Extension-Ladder Stop, of which the following is a specification.

This invention relates to extension ladders and fastening means for the same.

The primary object of this invention is to provide a fastening means for extension ladders which will hold the ladders securely locked against relative movement in one direction and which will readily permit relative movement of the two in the opposite direction.

This and other objects as will appear are accomplished by my invention which is fully described in the following specification and shown in the accompanying drawing, in which- Figure 1 is a partial perspective view of two sections of an extension ladder, which are secured together by my lock; Fig. 2 is a perspective view of the lock removed, and Fig. 3 is a partial sectional view on the line 3-3 of Fig. 1.

I have illustrated an embodiment of my invention as applied to a ladder having side rails 10 and 11, which are connected by any form of rungs 12. This ladder forms I the bottom section of the extension ladder and will be called the stationary ladder.

The movable ladder has side rails 13 and 14, which are adapted to lie between the side rails 10 and 11 of the stationary ladder and which are connected by rungs 15. A hook which is represented generally by A, is preferably made of bar iron and has loops 16 through which one of the ru'ngs 15 is placed before the ladder is assembled. Adjacent the loops are bearing portions 17 and bent portions 18, which serve as hooks to engage the rungs 12 of the stationary ladder. The loops 16 terminate in diagonal extensions 19 and bent ends or lugs 20 which engage the outer edges of the side rails of the movable ladder.

It will be understood that the stationary ladder has the lower ends of its side rails resting upon the floor and that near its upper end it has a guide (not shown) for the upper end of the movable ladder. As the movable ladder is pushed up, the straight bearing portions 17 strike the next rungand the entire hook A is turned about its rung 15 in a counter-clockwise direction, until the bearing portion 17 has moved'far enough to one side to permit the rung 12 to pass, when the hook A will drop back by gravity to the position shown in Figs. 1 and 3.

As the movable ladder again descends, the bearing 17 will engage the next rung 12 and the lugs 20 engage the edges of the side rails 13 and 14 and hold the hook A in the position shown, thereby preventing the movable ladder from descending farther.

It will also be observed that with this arrangement, the rungs of the two ladders come at the same level, so that a person descending the ladder will not encounter an unequal space when the movable ladder ends.

While I have shown and described but a single embodiment of my invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as, broadly as possible in view of the prior art;

What I claim as new and desire to secure by Letters Patent is:

1. A hook for extension ladders comprising a member having an eyelet adapted to oscillate about a rung of one of said ladders, a hooked portion adapted to engage a rung of an adjoining ladder and a lug adapted to engage the first mentioned ladder so as to prevent relative movement of the two ladders in one direction.

2. A hook for extension ladders comprising a member having an eyelet adapted to oscillate abouta rung of one of said ladders, a hooked portion adapted to engage a rung of an adjoining ladder and a lug adapted to engage the first mentioned ladder so as to prevent relative movement of the two ladders in one direction, said hook being adapted to maintain said rungs at substantially the same level.

3. A hook for extension ladders comprising a member having an eyelet adapted to oscillate about a rung of one of said ladders,

a hooked portion adapted to engage a rung ders in one direction, said hook being adapted to be swung out of the path of the rungs of said adjoining ladder as said ladders are moved in the reverse direction.

4. In combination, a stationary ladder, a movable ladder having side rails adapted to lie Within the side rails and against the rungs of the stationary ladder and a hook hingedly mounted on a rung of the movable ladder having lugs adapted to engage stops whereby said hook Will lock the ladders against relative motion, in one direction 15 and will swing out of the path of the rungs ofithe stationary ladder to permit the upward movement of the movable ladder.

PETER BRO MAN.

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