Note: Descriptions are shown in the official language in which they were submitted.
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
1
TITLE
"LADDER STABILISER"
FIELD OF THE INVENTION
This invention relates to a ladder stabiliser for stabilising a
ladder.
BACKGROUND OF THE INVENTION
The use of ladders on a level, firm surface by an individual is
typically quite safe. Feet, usually found on most modern ladders, are
sufficient to keep the ladder in position when a person is climbing a ladder
on a flat surface.
However, difficulties often arise when the surface is inclined
and/or soft. A person who climbs a ladder frequently causes the stability
of the ladder to be compromised causing the ladder and the person using
the ladder to fall. Therefore, on an inclined or soft surface, a second
person has been required to hold the ladder.
To overcome the need for a second person, ladder
stabilisers have been developed to assist in preventing the ladder from
falling when in use. One such ladder stabiliser is shown in European
Patent Application No. 172 284. This ladder stabiliser works well in most
situations as the leg of the stabiliser can be adjusted relative to the stile
on
the ladder to allow for differing incline surfaces.
However, the ladder stabiliser shown in European Patent
Application No. 172 284 may not provide sufficient ladder stability when
there are obstacles such as walls preventing the extension of the leg. In
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
2
this situation, the leg will provide little or no stability to the ladder.
Further,
the number of components that are used to manufacture the ladder
stabiliser is large making the ladder stabiliser expensive to manufacture
and difficult to attach to the ladder.
Similar ladder stabilisers have been disclosed in US Patent
No. 5,551,529, US Patent No. 5,154,257, US Patent No. 4,807,720
Canadian Patent Application No 2,281,209 and International Publication
No WO 02/059446. All of these ladder stabilisers have legs that are
extendable. However, all these ladder stabilisers are expensive to
manufacture, do not extend substantially laterally and/or are difficult to
transport.
OBJECT OF THE INVENTION
It is an object of the invention to overcome or alleviate one or
more of the above disadvantages or provide the consumer with a useful or
commercial choice.
SUMMARY OF THE INVENTION
In one form, although not necessarily the only or broadest
form, the invention resides in a ladder stabiliser for stabilizing a ladder
comprising:
an arm member attachable to the ladder, the arm member
including a body, a leg and a foot;
said leg being movable telescopically with respect to the
body;
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
3
said foot being attached adjacent to an end of the leg and
movable with respect to the leg; and
a brace attached to the arm member and attachable to the
ladder;
wherein a pivot is attached to the end of the arm member to
pivotally mount the ladder stabiliser to a ladder.
The arm member may be pivotally attached to the ladder
using a hinge. The hinge may be attached adjacent an end of the body.
The leg may be located within the body. The leg may be
fixed to the body once a desired location has been attained. A fastener
such as a thumbscrew or spring biased pin may be used for this purpose.
The foot may be rotatably movable with respect to the leg.
The foot may include a threaded shaft that rotates within a nut. The nut
may be attached to a plate.
Alternatively, the foot may be pivotally attached to the end of
the leg.
The brace may be attached to the body. The brace may be
pivotally attached to the ladder. A tab forms part of the body to capture a
pin located on the brace.
The brace may be telescopic to adjust the angle of the arm
member with respect to the ladder.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention, by way of example only, will
be described with reference to the accompanying drawings in which:
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
4
FIG. 1 is a front view of two ladder stabilisers attached to
stiles of a ladder according to a first embodiment of the invention;
FIG. 2 is an exploded perspective view of the ladder
stabiliser shown in FIG. 1.
FIG. 3 is a front view of two ladder stabilisers attached to
stiles of a ladder according to a second embodiment of the invention;
FIG. 4 is an exploded perspective view of the ladder
stabiliser shown in FIG. 1;
FIG. 5 is a side view of a hinge connecting the ladder
stabiliser to the ladder;
FIG. 6 is a perspective view of a foot attached to a leg; and
FIG. 7 is a perspective view of an alternate brace.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIGS. 1 and 2 show a ladder stabiliser 10 for use on a ladder
11. The ladder stabiliser 10 comprises an arm member 20 and a brace
30. The arm member 20 has a body 40, a leg 50 and a foot 60.
The body 40 is produced using a rectangular hollow channel
41. A threaded hole 42 is positioned adjacent a bottom end of the channel
for location of a thumbscrew 43. A tab 44 is located on the side of the
hollow channel 41 to allow the brace 30 to be attached to the body 40. A
hinge 45 is attached to the top end of the channel 41 and is used to attach
the body 40 to a stile 12 of the ladder 11. Rivets (not shown) are used to
attach the hinge 45 to the stile 12 of the ladder.
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
The leg 50 is also formed from a rectangular hollow channel
51. The channel 51 is sized so that it fits with the channel 41 that forms
the body 40. This allows the leg 50 to slide telescopically with the body
40.
5 A series of spaced threaded holes 52 are located along the
length of the channel 51. The holes 52 are positioned so that when the
leg 50 is slid with the body 40, the holes 52 of the leg 50 are aligned with
hole 42 located on the body 40. The thumbscrew 43 is placed through the
aligned holes 42,52 to hold the leg 50 securely with respect to the body
40.
The foot 60 includes a U-shaped plate 61 to which is
attached a threaded nut 62. A threaded shaft 63 is located through the
nut 62. A base 64 is attached to an end of the threaded shaft 63 and a
rubber shoe 65 is attached to the base 64. Rotation of the shaft 63
causes the base to move closer to or further away from the U-shape plate
61 dependent upon the direction of rotation of the shaft 63. The foot 60 is
attached to the leg by located screws 67 through holes 66,53 in the U-
shape plate 61 and the leg.
The brace 30 is formed from a flat strip of metal 31. A pin 32
is located at one end of the brace to allow the pin to be located with the
tab 44 of the body 40. The brace 30 is attached to a stile 12 of the ladder
11 using an appropriate fastener such as a screw, bolt or the like.
In use, the ladder stabiliser 10 is used in the following
manner. Once the ladder 11 is located in its desired position, the pin 32
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
6
on the brace 30 is located through the tab 44. The thumbscrew 43 is then
removed from the hole 43,52 and the leg 50 is extended from the body 40
until the foot hits the ground. If the hole 52 in the leg 50 and the hole 42
in
the body 40 do not align when the foot touches the ground, the threaded
shaft 63 is then rotated to extend or shorten the length of the arm member
so that the holes 42,52 are aligned. The thumbscrew 43 is then replaced
in the holes to secure the leg with respect to the body.
FIGS 3 and 4 show a further embodiment of a ladder
stabiliser 110 attached to a ladder 111. The ladder stabiliser 110 again
has an arm member 120 and a brace 130. The arm member 120 again
has a body 140, a leg 150 and a foot 160.
The body 140 is produced using a hollow channel 141. A
spring biased pin 142 is located within a hollow shaft 143 that extends
upwardly from the body 141. The pin 142 is biased toward a position
where the pin 142 extends into the hollow channel 141. A tab 144 is
located on the side of the hollow channel 141 to allow the brace 130 to be
attached to the body 40. A hinge 145 is attached to the top end of the
hollow channel 141 and is used to attach the body 140 to a stile 112 of the
ladder 11.
FIG 5 shows the hinge 145 in more detail. The hinge 145
includes a spigot 146 and a hinge pin 147. The spigot 146 is connected to
a stile 112 of the ladder 111. The hinge pin 147 extends through the
hollow channel 141 and the spigot 146 to allow rotation of the arm
member 120 with respect to the ladder 111. A lock 148 passes through
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
7
the hinge pin 146 to prevent loss of the hinge pin 146. A chain 149,
connected to the hollow channel 141 and the lock 148, assists in prevent
the loss of the hinge pin 147.
The leg 150 is also formed from a rectangular hollow
channel 151. The channel 151 is sized so that it fits with the channel 141
that forms the body 140. This allows the leg 150 to slide telescopically
with the body 140.
A series of spaced holes 152 are located along the length of
the channel 151. The holes 152 are positioned so that when the leg 150
is slid with the body 140, the holes 152 of the leg 50 are aligned with pin
142 located on the body 140. The pin 142 extends through the hollow
channels 141 and 151 to locate within a respective hole 152 to fix the
channels 141 and 151 with respect to each other.
The foot 160, shown in more detail in FIG. 6, is formed from
a plate 161 with two upwardly extending wings 162. A lug,153 is located
between the wings 162 and is attached to the end of the leg. A bolt 163
extends through the lug 153 and the wings 162 to pivotally mount the foot
160 to the leg 150.
The brace 130 is the same as described above and formed
from a flat strip of metal 131. A linking pin 132 is located at one end of the
brace to allow the linking pin 132 to be located with the tab 144 of the
body 140. The brace 130 is attached to a stile 12 of the ladder 11 using
an appropriate fastener such as a screw, bolt or the like.
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
In use, the ladder stabiliser 110 is used in a similar manner
to that described above. Once the ladder 111 is located in its desired
position, the linking pin 132 on the brace 30 is located through the tab
144. The spring biased pin 142 is pulled upwardly to allow the leg to 150
to move telescopically from the body 140 until the foot 160 hits the ground.
Once the foot touches the ground, the spring biased pin is released and
the leg 150 moved with respect to the body 140 until the spring biased pin
engages a hole 152.
FIG. 7 shows an alternate brace 200 that may be used with
either of the above embodiments. The brace 200 includes an outer body
210 and an inner body 220. The inner body 220 fits within the outer body
and is reciprocatable with respect to the outer body 210. A spring biased
pin 230 is located within a hollow shaft 240 that extends upwardly from
outer body 250. The pin 230 is biased toward a position where the pin
230 extends into the outer body 210.
The inner body 220 has a series of holes 260 that extend
along the inner body 220. The holes 260 are positioned so that when the
inner body 220 is slid with the outer body 210, the holes 260 of the inner
body 220 are aligned with pin 230 located on the outer body 210. The pin
230 extends through the outer body 210 and inner body 220 to locate
within a respective hole 260 to fix the outer body 210 and the inner body
220 with respect to each other.
As with the earlier brace 130, a linking pin 270 is located at
one end of the brace 260 to allow the linking pin 132 to be located with the
CA 02553422 2006-07-13
WO 2005/083223 PCT/AU2005/000275
9
tab 44 or 144 of the body 40 or 140. The brace 270 is pivotally attached
to a stile of the ladder using an appropriate fastener such as a screw, bolt
or the like.
The alternate brace 200 enables the arm member to be
angled at a variety of different angles with respect to the ladder due to the
telescopic nature of the brace 200. Therefore, on ground that is uneven,
the ladder stabiliser can provide a greater lateral force if necessary by
increasing the angle between the ladder and the ladder stabiliser.
The advantage provided by the ladder stabilisers described
above is ease of manufacture, the ease in which it is attached to ladder
and the ease in which the ladder stabiliser is positioned for use. Further,
the ladder stabilisers can be easily transported whilst still attached to the
ladder.
It should be appreciated that various other changes and
modifications may be made to the embodiment described without
departing from the spirit or scope of the invention.
