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Патент USA US2126171

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Aw? 9,‘ 1938”
H, J. CARBIS '
‘ 2,126,171
LADDER.
Filed June 28, 1937
3 Sheets-Sheet 1
/// '
Aug. Q, 193%. ‘
H, J. cAéais ‘
‘
2,126,171
LADDER‘
Filéd' June 28, 1937
3 Sheets-Sheet 2
O
3mm
J r J Gambia .
hi’atented Augl9,‘ 1938
I
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‘
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a
,
UNITED STATES PATENT OFFICE‘
Henry J. Carbis, Tarentum, Pa., assignor to
.
Aluminum Ladder 00., Tarentum, Pa.
Application June 28, 1937, Serial‘No..150,875
'
' 4 Claims.
(Cl. 22a-29)
The device forming the subject matter of this
application is a ladder, made preferably of extruded metal, such as aluminum or magnesium;
The invention aims to improve the connection
5 between the steps and the side rails of the ladder,
to improve and simplify the platform construction, to improve the prop, if the device is of the
‘The steps fit between the ?anges} and 4 of
thevside rails |,- and each step comprises a tread
B,a front ?ange 9, and a rear ?ange iii, the ?anges
extending downwardly. Securing elements ii
connect the front ?ange 9 of each step with-the t
front ?anges l of the rails i, and connect the
rear ?ange Iii of each step with the rear ?anges
step ladder type, to improve the shelf structure ‘ ii of the side rails ll-
'
and, generally to improve and to enhance the
The treads 8 of the steps have depending in
‘hereinafter described and claimed, it being under-'
stood that'changes in the precise embodiment of
ing peculiarly desirable in connection with long
ladders, strength being gained, and the weight
i a. utility'of devices of that type to which the present termediate ?anges i2, and there may be any ill
invention appertains.
> '
desired number of. the ?anges ll, %As shown in
With the above and other objects in view, which ' Fig. 1, all of the steps saving the lowermost step
will appear as the description proceeds, the in- _ are provided with a single intermediate ?ange i2,
vention resides in the combination and arrange- but the lowermost step has a plurality of such
35 ment of parts and in the details of construction ?anges, for instance two, such a construction be-' .15
_ the invention herein disclosed, may be made with-
in the scope of what is claimed, without depart20 ‘ing from the spirit of the invention.
,
‘In the accompanying drawings: ‘
lower edges with enlarged, longitudinal reinforc- 20
‘
ing ribs ll.
Fig. 1 shows in vertical section, a ladder, con-
structed in accordance with the invention;
Fig. 2 is a front elevation;
25
'
3!
‘
"
If the structure is to be embodied in a step
ladder, a platform it is provided. This platlorm
'
' t it, as Fig. 4 will show, is a duplicate of the upper
Fig. 3 is a top plan on an enlarged scale, parts
being broken away;
of the ladder,‘ as a. wholebeing kept down. The
several ?anges 3, ii and it are suppliedat their
'
most step and of all of‘ the steps saving the 2s '
lowermost step.
It includes atread it, a front
Fig. 4 is a transverse section on the line ll-d flange ill, a rear ?ange it, and an intermediate
of Fig. 3;
~
?ange i9, all, constructed as hereinbefore de
Fig. 5 is a section on the line H of Fig. ‘i; scribed, and supplied at their lower edges with
'30 . Fig. 6 is a section on the line .d-? of Fig. l; , longitudinal reinforcing ribs 2d, like the ribs it. 30
Fig. 7 is a section on the line ‘l-"l of Fig. i; The tread it of the platform is placed in hori
Flg. 8 is a side elevation showing a modi?ca- _ zontal ‘alignment with the tread t of the upper
tion,parts being broken away;
, ,
most step, the depending front ?ange ll of the
Fig. 9 is a cross section on‘ the line d—'@ of
35 Fig. 3.
.
"
.
‘
tread-"it of the platform being placed against
the‘ rear surfaces of the rear ?anges 3 of the side 35
The ladder proper includes side rails l,'which
‘rails Ilfof the both]. Thesecuring elements it
‘in the form shown in Figs. 1 to 7 ‘are one-piece which‘connect the rear ?ange it of the upper
‘ channels, each including a body 2 having an most step with'the ?anges l of the side rails lv
inwardly projecting rear “?ange l and an in~ Y aiso‘connect the front‘ ?ange ll of‘the platform
40 wardly projecting front ?ange l. The ?anges , it with the said rear ?anges l.
'
3 and l are. slit transversely. near their lower
Top rails ii are provided, and are angle mem
ends, and are turned inwardly, whereby the lower
portions of the bodies l'of the side rails i form
‘ inwardly extended foot pieces 5 closing the lower
45 ends 'of the side rails i, the lower portions of >
1 50
hers. Their horizontal ?anges overlap the tread
t of the uppermost step and the tread it of
the platform It. The vertical depending ?anges
of the top ‘rails 20 extend downwardly, and close 45
the ?anges l and. d forming lips t which overlap
the uppermost step and the platform l5 at their
the lower ends of the ?anges 3 and It, as shown
‘ends. as shown in Fig. 4." Securing elements 22
in Fig. l. Securing elements 7! connect the lips
connect the depending ?anges of the top rails
84 with the ?anges ii and 4.
'
‘
Any desired number of steps are provided and
do
ill with the bodies 2 of the side rails i.
Secur-.
ingeIements 23 connect the horizontaL'inwardiy 50
are in the form of channel members. The steps, . projecting ?anges‘ of the top rails II with the
‘the side rails i and other parts to be described
hereinafter preferably are made of extruded
metal, and aluminum or magnesium is mentioned
55 as a proper metal, owing to its lightness.
'
tread ii of the platform IS.‘ The uppersurfaces
of the steps and of the platform ii are grooved
longitudinally, as at’ 24, to form anti-slipping
ribs 25.
'
' 55
‘
2
9,128,171
If the invention is embodied’ in the form of
a step ladder, a prop P is provided, and includes .
side members 21, each in the form of a channel,
including a front ?ange 28, a rear ?ange 29'
and a body 30, the foot pieces 3i being formed
in the manner hereinbefore described in connec
tion with the foot pieces 5.
The body 30 voi’
each side member 21 of the prop P is extended
upwardly above the ?anges 23 and 29 to form an
10 ear 32.
subject matter of this application is simple in '
construction, light, and characterized by strength
and ability to withstand hard and long continued
use.
'
In Figs. 8 and 9, parts hereinbefore described
are designated by numerals previously used, with
the suffix "‘a". In this
form of the invention,
the side rails in, although channel-shaped, are
made of angle members. The .angle members
The side, members 21 of the prop P . .which make up the side rails are connected near 10
extend upwardly inside of the depending ?anges
of the top‘ rails 2i, the ears 32 being connected
to the said ?anges by pivot elements 33. The
rear ?anges 29 of the side members 21 of the
15 prop P may be joined by as many transverse ties
34 as are considered necessary. Downwardlyand
outwardly inclined braces 35 connect the ties 34
with the rear ?anges 29 of the side members 21
of the prop P.
U-shaped, inwardly projecting brackets 36 are
20
connected by securing elements 31 to the bodies
30 of the side members 21 of the prop P, as shown
their upper ends by a gusset plate ill. They are
connected near their lower ends by a gusset plate
131, and a U-shaped seat I92 is interposed be
tween the angle members at their lower ends.
Having thus'described the invention, what is
claimed is:
_
.
1. A ladder comprising side rails having front
and rear'?anges, steps having their ends dis
posed between the ?anges, the steps being in the
form- of channels having depending front and
rear ?anges, means for securing the front ?anges
of the steps to the front ?anges of the side rails,
in Fig. 6. A rearwardly extended shelf S is pro- . a platform ‘duplicating one step and disposed in
vided and includes side strips 39, which are angle alignment therewith, and means for securing the
members. The inwardly extended horizontal front ?ange of the platform and the rear ?ange
- ?anges of the side strips 39 support a table 40, of said one step to the rear ?anges of the aid
connected thereto by securing elements 4i, the rails.
2. A ladder comprising side rails having front
table 40 being supplied at its rear end with a‘
depending lip 42 which extends downwardly over and rear ?anges, steps having their ends disposed
the rear ends of the side strips 39. Intermediate between the ?anges, the steps being in the form
their ends, the depending ?anges of the side strips of channels having depending front and rear
?anges, the depending terminal ends of said
39 are connected to the brackets 36 by pivot ele
ments 39. When the shelf S is in a horizontal ?anges being enlarged to provide reenforcing and
position, the forward portions of the side strips strengthening means for said steps, means for
39 engage the lower edge of the‘ rear ?ange iii securing the front ?anges of the steps to the front
of the step next below the top step, and the side ?anges of the side rails, a platform duplicating
strips 39 of the shelf ?t closely between the inner one step ‘and disposed in alinement therewith,
edges of the front ?anges 4 of the side rails I, and means for securing the front ?ange of the
as shown in Fig. 2. When the shelf S is turned
on the pivot elements 38 into alignment with the
prop P, the lower end of one of the side strips 39
of the shelf engage an inwardly projecting stop
48 (Fig. 22) secured as shown‘ in Fig. 1 to the rear
45
?ange 29 of one of the prop members 21.
Foldable braces B hold the prop and the main
portion of the ladder in‘the position shown in
Fig. 1. The braces B include rear members 43,
pivoted at 44 to the bodies 30 of the side members
21 of- the prop P. The braces include forward
members 45, pivoted at 43 to the bodies 2 of the
side rails I of the ladder proper. Intermediate
their ends the forward members 45 of the braces
B are pivoted at 50 to the forward ends of the
rear members 43 of the braces. As shown in Fig.
"l, the forward member 45 of each brace 13 isv sup
plied along its upper edge with a lateral lip 41
which engages the upper edge of the rear mem
platform and the rear ?ange of said one step to
40
the rear ?anges of the side ‘rails.
3. A ladder comprising side rails having front
and rear ?anges, steps having their ends disposed
between the ?anges, the steps being in the form
of channels having depending front and rear
?anges and intermediate depending ?anges be 45
tween said front and rear ?anges, the depending
terminal ends of all of said ?anges being en
larged to provide reenforcing and strengthening
means for said steps, means for securing the front
?anges of the steps to the front ?anges of the 50
side rails, a platform duplicating one step and
disposed in alinement therewith, and means ‘for
securing the front ?ange of the platform and
the rear ?ange of said one step to the rear ?anges
of the side rails.
'
.55
4. A ladder comprising side rails having front
and rear ?anges, steps having their ends disposed
between the ?anges, the steps being in the form
of channels having depending front and rear
ber 43 of the brace B and holds the parts 43 and
45 of the brace in the position shown in Fig. 1
‘ ?anges, and intermediate depending ?anges be
of the drawings.
Especial attention is directed to the way in . tween said front and rear ?anges, the depending.
which the steps are joined to the side rails i, and terminal ends of said ?anges being enlarged to
to the way in which the platform 15 is formed provide reenforcing and strengthening means for
said steps, means for securing the front ?anges
and held in place, as shown in Fig. 4, the plat
of the steps to the front ?anges of the side mus;
form being a duplicate of the uppermost step.
By' using extruded metal'whenever possible, an -a platform duplicating‘one step and disposed in
advantage is- gained over the use of fabricated alinement therewith, and means for securing the
front ?anges of the platform and the rear flange .
sheet metal. The extruded metal can be pur
chased as an article of manufacture and can
simplyl-be cut off in proper lengths, it being un
of said one step to the rear ?anges of the side '
rails, and a prop pivoted to said platform and 70
necessary to- form a channel as a step in the comprising rails having front and rear ?anges.
‘
. \
HENRY J. CARBIB.
making of the ladder. The device forming the -
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