US1887546A - Metallic trussed aerial ladder - Google Patents

Description

No 15, 1932- R. F. cowELL METALLIC TRUSSED AERIAL LADDER FiledJune 1'7. 1931 Y INVENTOR 'berll. ZWe/l v sembled and operated, both the bed and fly Y Patented Nov. 15, 1932 UNITED STATES [PATENT f ROBERT F. coWnLL, or TEANECK, New JERSEY, Assrenon fro rivrninvA-'rremiI. Moron YCOMPANY', or New YORK, N. Y.,

A 'ooRroRAT'ro-N oF DELAWARE- e METALLIC TRUSSED AERIAL LADDER Application led J une 17,

The present invention relates to extension ladders for use particularly in connection with fire apparatus and embodies, more specically, an improved ladder construction, wherein a bed land fly ladder are so constructed as to be adaptedto be readily asladders being trussed, the fly ladder being `of a maximum width which is substantially equal to that of the bed ladder.

More particularly, the invention embodies an improved ladder construction, wherein great rigidity is afforded against stresses transverse to the plane of the ladderand, with the foregoing in view, it is proposed to provide trusses for both the bed and fly ladders, at the same time preserving, as closely as possible, the width of the fly ladder to substantially that of the bed ladder.

A further object of the invention is to provide a ladder construction of the above character, wherein the gravitational weight of the fly ladder is carried effectively by the bed ladder upon suitable rollers to facilitate the nesting and extension of the fly ladder.

A further object of the invention is to provide a ladder construction of the above char- Y acter which affords a maximum strength with a minimum of weight, the assembly and operation of the elements being readily effected.

Further objects, not specifically enumerated above. will be apparent as the invention is described in greater detail in connection with the accompanying' drawing, wherein:

Figure 1 is a view in section, taken on line 1-1 of Figure 2, showing a portion of one side of the ladder assembly, the section being taken through the ladder rungs and looking toward the side beams of the bed and fly ladders in the nested position.

Figure 2 is a view in section, taken on line 2-2 ofFigure 1, and looking in the direction j ders are formed of metal and the bed ladder includes spaced channels 10. these channels being U-shaped in cross section and the up-v per and lower flanges 11 and 12, respectively, extending inwardly. lVithin the channel,

spaced brackets 13 are secured, the brackets 1931. gserial no. 544,991.T I

being .formed with oppositely extending arms 14 which .are riveted tothechannel -at 15. Upon ,the brackets are bosses 146v over, which the lends of the ladder ringsI 17 are inserted. The rungs are ,preferably welded 1n :positionat 18 asshown inFigure 2. "Upon theputer sidesof .the channels, brackets 19 are mounted, the. lower. extremities' lof v.theses brackets ,being riveted at 20 to the channels andformed with Yoppositely extending arms 19, rivetedv at 15 to channel'l@ ,and'brackets 13.

Spaced from the rivets, are bolts 21 which not only serveto secure the brackets. 19 to the channel butk extend inwardly `between .the flanges 11 .and 12 andmount rollers The brackets-19 are formedwithupwardly .ex-y tending truss rodposts 23, at the lower extremities of which toes 24C are formed to extend over theV upper Hang-e111 .of the, channel.

and afford bearing lsupports, for, the `posts thereon. 4*The upper extremities ofthe truss rodposts are aperture-d at 25 and receive va hollow trussy rod 26` which is .preferably welded or otherwise secured thereto and anchored at its ends at the extremities of the channel.

The fly ladder is formed of a pair of chani nels 27 each of which has upper and lower flanges 28 and 29, respectively. L The flanges 28 and 29 extend outwardly and the'lower flange 29 is mounted between the flange 11 and the rollers 22. This construction affords adequate bearing support for the channels 27. at the same time preserving a maximum width of flyladder. `VUpon the sides Vof the channels, brackets 30 are mounted, these A brackets being formed with oppositely extending arms 31 which are riveted at 32 to the 'channels andr bosses 33 over which the fly' ladder rungs 34 are mounted. Rungs 34 are welded to the bosses 33 at 35 and thel brackets 30 areprovided with offsetY and upwardly I extending truss rod supporting posts 36 which are formed with flanges 37 rivetedv at 38 tothe top flange 28. Posts 36 terminate at substantially the height of the correspond- L ving bed ladder truss rod posts in order that eof ooV

posts are apertured at 39 to receive the fly ladder truss rod 40 which is suitably secured thereto.

From the foregoing, it will be seen that a ladder construction has been provided which affords a maximum width of Hy ladder for a given width of bed ladder, the construction being such as to afford great strength to the ladder assembly. The foregoing construction further provides a minimum'of ladder weight with a maximum of rigidity, the operation of the ladder being. facilitated by the .provision of rollers which are mounted Within the bed ladder channels, as above described. Y

While the invention has been described with specific reference Ato the accompanying drawing, it is not to be limited, save as defined in the appended claim.

I claim as my invention:

A metallic ladder construction comprising a bed ladder having 'channel beams with flanges turned inwardly, bed ladder truss rods, truss rod posts secured to the channels and lying substantially in the plane of the outer sides of the channels, said truss rods being secured to the truss rod posts, a fly ladder carriedby the bed ladder vand l,formed withv channel beams having flanges turned outwardly, the loweranges of the fly ladder beams lying between the flanges of the bed ladder beams, and truss'rods carried by the fly ladder beams. v Y' This specification signed June A'. D. 1931.

this .3rd Vday of ROBERT F. cowELL.`

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