US2615665A

US2615665A - Safety ladder bracket

Info

Publication number: US2615665A
Application number: US791499A
Authority: US
Inventors: Baxter Kirby
Original assignee: EVELYN M WHITE
Current assignee: EVELYN M WHITE
Priority date: 1947-12-13
Filing date: 1947-12-13
Publication date: 1952-10-28
Anticipated expiration: 1969-10-28

Description

Oct. 28, 1952 K. BAXTER SAFETY LADDER BRACKET Filed Dec. 13, 1947 I INVENTOR. K/RBY BAXTER M KAWAJ ATTOQKEVS.

Patented Oct. 28, 1 952 KirbyBaxter..("llevela nd, Ohio, assignonbyamesne" -entaJQEoneP-haIf-to -Evelm-M. White;

' ,Gleyelandfil i *sn nmi seee sg s messes M 9 3 It is one of'the principal obiectsiof; th-,- mvn+ tion to provide anovel laddetudtructure which when collapsed occupies a minimum of space for storage in any convenientout-of-the-way'place.

It is another object to provide novel means whereby the ladder'may'bequickly and'firmly clamped to a windowsill Off a building "with; the ladder; hanging downward along-the outer wall of such building. 1 f'ff Another object is to provide'a clampingmeans so constructed that the weight-of the ladder plus that of the persorr'or-persons-thereon is -operative to effectively increase the clamping' action effected by said means. "if

Other objects and advantages -'-will become apparent as the following description proceeds.

To the accomplishment of the foregoing and. related ends, said invention, then, comprises the features hereinafter fully described and particularly pointed out in the claim, the following description and the annexed drawing setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 is a side elevation view of a preferred embodiment of my invention showing the same in an unfolded position suspended from the windowsill of a building;

Fig. 2 is a front elevation view;

Fig. 3 is a top plan view;

Fig. 4 is a side elevation view illustrating the invention in its collapsed or folded position; and

Fig. 5 is a side elevation view of a modified form of clamping means by which the ladder may be suspended from a windowsill.

Referring now to the drawing and first to Fig. 1, there is shown therein a fragmentary vertical cross section of a building I through the window 2 thereof, the term building as used herein including dwelling houses, apartments, hotels, commercial and industrial vbuildings, etc. Said window is of the usual construction including a sill 3 having a projection 4 into the room and a projection 5- extending outward of the outer wall of the building.

The ladder structure herein illustrated comprises parallel side stripseach of which comprises a string of long links 5 arranged inzig za'g form with; the adjacent ends pivotally connected to one another by the rods I I and 8;said rods extending across saidsides to thus join them together. As shown, the links 6] fit o' e reduced end portions.

of"sa id"rods 8,an'd nuts 9 or the like threaded onto such reduced ends are emplo yed for retaining said strings and rods together.

f' Piv t ily connected tof'eac'hofi the rods 18 and also pivotally connected tofone another arelinks In which, as best shown'in' Fig. assumean inline position relative to ojne another when the ladder unfolded to thus retain' the string of lin'kst ina zig-zagform; Saidlinkslq also serve as convenient handrails adapted to be'jgrasped' by persons soingup' or down the'ladder- Thus the rods 8 constitutefrungs which are. spaced from the outer wall of the building to'thereby provide toeclearance.

A h rend' rollers H preferablymade of rubberer rubberlike material so a n dm'ar'the "outer. wall of the building wheii'tlie. ladder is lowered from the window. Said rollers also facilitate unfolding of the ladder.

Connected to the lower end of the ladder is a short chain l2 provided with a hook I4 which is adapted to be hooked onto the suspending means,

as shown in Fig. 4, whereby to retain the ladder in a folded condition.

Pivotally connected to the uppermost rod 8 is one end of a link I5 which has its other end pivotally connected as at I! to the outer end of a generally horizontally disposed lever I8. Connected to the inner end of lever l8 are two hook members l9 and 20, respectively hooked under'the

projections

4 and 5 of the windowsill 3. The means which connects hook l9 to lever 18 preferably includes a turnbuckle 2| which may be suitably adjusted to accommodate difierent sizes of windowsills, such adjustment being preferably made in advance so that should it be necessary to use the ladder in an emergency it can merely be hooked over the windowsill and lowered without necessitating such time consuming adjust-' ment.

The hook 20 is pivotally connected at the point 23 to lever l8 as by a chain or s-hook 22.

It is now apparent that with the suspending means just described any load applied at the I gaged with the

sill projections

4 and 5, and, likewise, when one or more persons are on the ladder "of, I there; areQprovide d such drawing-together action of the hooks will be correspondingly greater.

In the modified suspension means illustrated in Fig. there is a hook member 24 associated with the inner projection l of the windowsill 3 and a hook 25 associated with the outer projection 5 01 the windowsill, said hooks being pivotally connected to each other at the point 28 and the latter hook member being. of Z-shape providing an outwardly extending leg 21 to the outer end of which the ladder is connected, and an inwardly extending leg portion 28 disposed the inner end of said lever being disposed beunder the projection 5. Here, again, win the structure illustrated in Figs. 1-4, the weighto! the ladder will efl'ect drawing of the

hooks

24 and 25 toward one another into flrm clamping relation to the windowsill. In order to accommodate different sizes of windowsills the hook 24 is provided with a plurality of openings 29 about any of which said hook 25 may be pivotally connected.

In summary, it can be seen that I have provided a safety ladder which can be adjusted to fit difierent sizes and types of windows and which folds up to a compact size so that it can be stored either under the windowsill or some other convenient place near the window. Likewise, the ladder can be made of light-weight material and can be made to any convenient length, viz. long enough to extend from 'one window to the next one below or long enough to extend for two or more stories.

As an important safety feature I have provided a novel clamping arrangement which avoids the possibility of jarring loose but yet at the same time such clamping means is of such simple form that it can be quickly and positively attached to the windowsill.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in the iollowingclaim, or the equivalent of such, be employed.

tween said-opposed hooks, link means pivotally connected at its opposite ends to the upper por- "tionbi said outer hook and to the inner end of said 'lever ancl other link means pivotally connected at its opposite ends to the upper portion of said inner hook and to said lever at a point between the inner and outer ends thereof whereby the weight of a ladder on the outer end of said lever is operative through said lever and both of said link means to draw said hooks toward one another.

KiRBY BAX'I'ER. REFl lRENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS