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Патент USA US2408373

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Oct. 1, 1946.
’
-
.
J, DE F, CHASE‘ -'
LADDER EXTENSION
2,408,372
'
Filed Nov. 10, 1944
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2,408,372
Patented Oct. 1, 13946‘
UNITED ’ STATES‘ PATENT
2,408,312
_
’
Lennon EXTENSION ~
Jesse, De ForestChase, Kansas CitygMo. ‘in. . _
* ' ‘Application November 10, 1944, Serial No. 562,8151
2 Claims. (01. 228-63)
1
recesses H, the plate being slidably mounted on
the pins [3 and retained in position thereon by
The present invention relates to new and useful
improvements in attachment for ladders and
more particularly to an extension adapted to be
attached to the lower end of one of the side rails
of the ladder to increase the length thereof
whereby to permit the ladder to stand level on
the heads M of the pins.
The plate I5 is formed with a pair of lateral ex-r
tensions l5 extending transversely of the adjacent
edge of the rail 5 and formed at their ends with
angular ?anges l1 adapted to engage ‘the side
edge of the rail 5. The inner surface of the ex
tensions l6 are also formed with serrations or
uneven surfaces.
An important object of the present invention
is to provide a ladder extension of this character
teeth It adapted to bite into the edge of the rail.
which may be easily and quickly attached in po 10 A U-shaped plate H! has its leg portion recessed
sition to either rail of the ladder and which at
in the opposite side of the member ‘I ?ush with
the same time is strong and durable, relatively
the surfaces thereof with the ends of the plate
inexpensive to manufacture and otherwise well
adapted for the purposes for which the same is
intended.
I9 projecting outwardly beyond the plate l5 and
15 provided with a pin 20 on which a lever 2| is piv
Other objects and advantages reside in the de
tails of construction and operation as more fully
otally mounted, the lever having a cam head 22
at its pivoted end adapted to bear against the
plate l5 to force the same inwardly against the I
hereinafter described and claimed, reference
member ‘I and with the extension IS in clamping
being had to the accompanying drawing forming
engagement with the rail 5 as shown in Figure 3
20
part hereof, wherein like numerals refer to like
of the drawing.
‘
.
parts throughout, and in ‘which:
Figure 1 is a fragmentary front elevational
view of a ladder showing the extension in posi
The lower end of the member 1 is formed with
a plurality of transversely extending openings 23
adapted to receive a pin 24 for underlying the rail
,
5 to further ‘support the lower end of the rail 5
Figure 2 is a transverse sectional view taken 25 on the extension ‘I. The openings 23 are prefer
substantially on a line 2-2 of Figure 3, and
ably arranged in vertical rows as shown in Fig
Figure 3 is a side elevational view of the exten
ure 3 of the drawing with the openings of one
broken
away
and
shown
in
‘ sion and with parts
row staggered with respect to the openings of
the other row, the pin 24 being selectively posi
section.
' .
Referring now to the drawing in detail wherein 30 tioned in the openings of either row in order that
for the purpose of illustration I have disclosed a
a relatively ?ne adjustment of the member 1
preferred embodiment of the invention, the‘ nu
relative to the rail 5 may be obtained.
meral 5 designates the pair of side rails of the
In the operation of the device when the lever
ladder and with the ladder rungs indicated at 6.
2| is moved into its lowermost position, the
35
The extension comprises a short piece of mate
clamping plate l5 and extensions it will be pro
rial 1 of a cross-sectional area substantially equal
jectedoutwardly from the member ‘I by the spring
to that of one of the rails 5 and preferably made
l2 whereby the extension member 1 may be ad
of wood and adapted for placing in facing con
justed longitudinally of the rail 5 and the pin
tact with the outer surface of one of the rails as
24 is then inserted into one of the openings 23 to
40
shown to advantage in Figure 1 of the drawing.
retain, the ladder in its adjusted position. The
To one edge of the member 1 is attached a pair
lever 2| is then raised upwardly so as to cause
tion thereon.
' .
of U-shaped plates 8 adapted to receive both the
rail 5 and the member 1 within the legs 9 of the
plate, the plate ‘being free of the ‘rail 5 and formed
at its inner surface with serrations or teeth Ill
adapted to bite into the edge of the rail.
The oppositeedge of the member ‘I is formed
with vertically spaced recesses ll within which
l2 are positioned and through which
coil springs
pins l3 extend with their inner'ends embedded
in the member 1 and their outer ends formed with
heads l4 spaced outwardly from the adjacent edge
the cam 22 to engage theplate l5 and force the
same inwardly against the member 1 thereby
forcing the extensions 16 inwardly against the
rail 5, the plates 8 and the extensions “3 thus
cooperating to'clamp the extension member ‘I
to the opposite edges of the rail 5.
operation and advantages of the device will be
readily understood from the foregoing without
50
7 further detailed explanation.
of the extension member 1.
A clamping plate [5 extends longitudinally
I
It is believed that the details of construction,
along‘the edge of the member ‘I and covers the 55
Having thus described the invention, what I
claim is:
.
'
1. A ladder extension comprising an elongated
3
2,408,372
member adapted for placing against one side of
a ladder rail, a pair of stationary U-shaped
clamping plates secured in vertically spaced rela
tion to said member and adapted to receive an
edge of both the ladder rail and said member for
relative sliding movement and to secure the mem
ber against lateral movement from the rail as
well as against forward or rearward tilting move
ment on the rail,v a movable clamping plate car
ried ‘by the member; cam means engaging: said
movable plate and adapted for moving the mov
able clamping plate into clamping engagement
with an opposite edge of the ladder rail, and
spring means yieldably urging the movable
clamping plate out of clamping‘ engagement.
2. A ladder extension comprising an elongated
4
a ladder rail, a pair of stationary U-shaped
clamping plates secured in vertically spaced rela
tion to said member and adapted to receive an
edge of both the ladder rail and said member for
relative sliding movement and to secure the mem
ber against lateral movement from the rail as
well as against forward or rearward tilting move
ment on the rail, a pair of pins projecting from
a relative opposite edge of the member, a mov~
able clamping plate slidably' mounted en; the pins,
cam means‘ carried by the elongated member and
adapted for moving the movable clamping plate
into clamping engagement with an adjacent edge
of. the: ladder rail, and spring means yieldably
urging the movable clamping plate out of clampiing engagement.
member adapted for placing: against one~ side‘ or - JESSE DE FOREST CHASE.
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