CA2693530A1 - Ladder stabilizing device - Google Patents
Ladder stabilizing device Download PDFInfo
- Publication number
- CA2693530A1 CA2693530A1 CA 2693530 CA2693530A CA2693530A1 CA 2693530 A1 CA2693530 A1 CA 2693530A1 CA 2693530 CA2693530 CA 2693530 CA 2693530 A CA2693530 A CA 2693530A CA 2693530 A1 CA2693530 A1 CA 2693530A1
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- Canada
- Prior art keywords
- ladder
- stabilizing
- support structure
- stabilizing member
- length
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/48—Ladder heads; Supports for heads of ladders for resting against objects
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
- E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
- E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
A device for stabilizing a ladder is provided. The device for stabilizing a ladder comprises a first stabilizing member having a predetermined fixed first length and a second stabilizing member having a predetermined fixed second length. The device for stabilizing a ladder further comprises a support structure for being mounted to the ladder at a predetermined location. The support structure is mounted to an upper portion of the first and the second stabilizing member, respectively. The support structure holds the upper portion of the first and the second stabilizing member in proximity of a first frame rail and a second frame rail of the ladder, respectively, such that each of the first and the second stabilizing members is independently rotatable around a first axis oriented substantially parallel to rungs of the ladder and around a second axis oriented substantially perpendicular to the first axis.
Description
LADDER STABILIZING DEVICE
FIELD OF THE INVENTION
The present invention relates to the field of ladder stabilizing devices, and more particularly to a ladder stabilizing device for stabilizing an extension ladder to prevent the extension ladder from slipping sideways.
BACKGROUND OF THE INVENTION
Extension ladders are very effective tools enabling a person to reach locations high above ground in a simple fashion for performing various tasks such as, for example, cleaning, painting, or repair. Extension ladders are commonly used by workers in performance of their occupation as well as individuals performing various tasks in a do-it-yourself fashion.
Extension ladders usually comprise two or more ladder portions with each ladder portion having a pair of parallel frame rails spaced apart and connected by a plurality of rungs. Typically, an upper portion of an extension ladder is leaned against a supporting surface such as, for example, a wall or roof structure of a building. When properly placed on a flat and stable surface extension ladders are usually relatively stable.
However, accidents frequently occur because the upper portion of the extension ladder slipping sideways. Such accidents are particularly likely when the extension ladder is used on uneven or sloping ground and when a person is at or near the top of the extension ladder resulting in severe injuries or death.
Various ladder stabilizing devices have been disclosed such as, for example, in: US Patent 7,163,084 (Blehm); US Patent 6,672,427 (Sheffield); US Patent 6,527,084 (Hrincu); US Patent 5,868,222 (Charbonneau); and US Patent 4,949,809 (Levi et al.). Unfortunately, these devices are complex and cost intensive to manufacture by employing telescopic components, difficult to install by having to mount various components to the ladder at more than two locations, and cumbersome to use by having to transport the various components and setting the various Page 1 of 12 components up in a proper fashion.
It is desirable to provide a ladder stabilizing device for stabilizing an extension ladder that is simple to set up.
It is also desirable to provide a ladder stabilizing device for stabilizing an extension ladder that is simple to mount to an existing extension ladder.
It is also desirable to provide a ladder stabilizing device for stabilizing an extension ladder that is simple and cost effective to manufacture.
SUMMARY OF THE INVENTION
Accordingly, one object of the present invention is to provide a ladder stabilizing device for stabilizing an extension ladder that is simple to set up.
Another object of the present invention is to provide a ladder stabilizing device for stabilizing an extension ladder that is simple to mount to an existing extension ladder.
Another object of the present invention is to provide a ladder stabilizing device for stabilizing an extension ladder that is simple and cost effective to manufacture.
According to one aspect of the present invention, there is provided a device for stabilizing a ladder. The device for stabilizing a ladder comprises a first stabilizing member having a predetermined fixed first length and a second stabilizing member having a predetermined fixed second length. The device for stabilizing a ladder further comprises a support structure for being mounted to the ladder at a predetermined location. The support structure is mounted to an upper portion of the first and the second stabilizing member, respectively. The support structure holds the upper portion of the first and the second stabilizing member in proximity of a first frame rail and a second frame rail of the ladder, respectively, such that each of the first and the second stabilizing members is independently rotatable around a first axis oriented substantially parallel Page 2 of 12 to rungs of the ladder and around a second axis oriented substantially perpendicular to the first axis.
According to another aspect of the present invention, there is further provided a device for stabilizing a ladder. The device for stabilizing a ladder comprises a support structure for being mounted to the ladder at a predetermined location and for being mounted to an upper portion of a first and a second stabilizing member, respectively. In operation, the support structure holds the upper portion of the first and the second stabilizing member in proximity of a first frame rail and a second frame rail of the ladder, respectively, such that each of the first and the second stabilizing members is independently rotatable around a first axis oriented substantially parallel to rungs of the ladder and around a second axis oriented substantially perpendicular to the first axis.
The advantage of the present invention is that it provides a ladder stabilizing device for stabilizing an extension ladder that is simple to set up.
A further advantage of the present invention is that it provides a ladder stabilizing device for stabilizing an extension ladder that is simple to mount to an existing extension ladder.
A further advantage of the present invention is that it provides a ladder stabilizing device for stabilizing an extension ladder that is simple and cost effective to manufacture.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention is described below with reference to the accompanying drawings, in which:
Figure 1 a is a simplified diagram illustrating a perspective view of a ladder stabilizing device according to a preferred embodiment of the invention;
Figure lb is a simplified block diagram illustrating an exploded view of the ladder Page 3 of 12 stabilizing device according to a preferred embodiment of the invention;
Figures 1c and 1d are simplified block diagrams illustrating a side view and a front view, respectively, of a hinge bracket of the ladder stabilizing device according to a preferred embodiment of the invention;
Figure 1 e is a simplified block diagram illustrating a front view of a portion of an extension ladder with the support structure of the ladder stabilizing device according to a preferred embodiment of the invention;
Figures if, lg and lh are perspective views of a self centering washer for use in one embodiment of the present invention;
Figure 1 i is a perspective view of a portion of the present invention, in exploded view;
Figures 2a and 2b are simplified block diagrams illustrating an extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention in a transport position;
Figure 3a is a simplified block diagram illustrating a side view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention in a transport position;
Figure 3b is a simplified block diagram illustrating a side view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention set up;
Figure 3c is a simplified block diagram illustrating a front view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention set up;
Page 4 of 12 Figure 3d is a simplified block diagram illustrating a top view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention set up; and, Figure 3e is a simplified block diagram illustrating a front view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention set up and with one stabilizing element having an extension mounted thereto.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs.
Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods and materials are now described.
While embodiments of the invention will be described for use with an extension ladder for the sake of simplicity, it will become evident to those skilled in the art that the embodiments of the invention are not limited thereto, but are also applicable for use with other types of ladders such as, for example, non-extendable ladders and folding ladders.
Referring to Figures 1 a to 1 i, a ladder stabilizing device 100 according to a preferred embodiment of the invention is provided. The ladder stabilizing device 100 according to the preferred embodiment of the invention comprises a first and a second stabilizing member 5 with each having a predetermined fixed length. The fixed length is determined such that a user is enabled to stabilize a ladder 20 on an uneven or sloped surface as will be described herein below.
A support structure 1, 2, 3, 4, and 17 is mounted to the ladder 20 at a predetermined location -typically dependent upon the overall length of the extended ladder 20. The support structure 1, 2, 3, 4, and 17 is mounted to an upper portion of the first and the second stabilizing member 5, respectively. The support structure holds the first and the second stabilizing member 5 in proximity of a left hand side frame rail 14 and a right hand side frame rail 14 of the ladder 20, Page 5 of 12 respectively. Each of the first and the second stabilizing members 5 is independently rotatable around a first axis 101 oriented substantially parallel to rungs 15 of the ladder 20 and around a second axis 102 oriented substantially perpendicular to the first axis 101.
Figure lb, illustrates an exploded view of the ladder stabilizing device 100 according to the preferred embodiment of the invention. Preferably, the support structure comprises a rod 2 - for example, a threaded rod or a rod having threaded end portions made of stainless steel or Zinc plated steel - for being mounted to the ladder 20. The rod 2 forms the first axis 101 and has at each of the threaded end portions a U-shaped hinge bracket 1 mounted thereto using typical hardware such as, for example, flat washers and self locking nuts 3 such that the hinge brackets 1 are enabled to pivot around the rod 2 using, for example, a predetermined torque setting when fastening the nuts. Preferably, the rod 2 is disposed within a bore of a hollow rung 15 of the ladder 20 and centered using a centering member. Depending on the size of the bore an embossment 1A of the hinge bracket 1 is used as centering member, as illustrated in Figures 1 c and ld. Alternatively, a self centering washer 17 - for example, a self centering Nylon washer -is employed, as illustrated in Figures lb, If, lg and lh, having a hole 17b therethrough for receiving the rod 2 and having a male centering portion 17b for whole or partial insertion into the hollow horizontal rung 15 and having a female recessed area 17c illustrated in Figure if for receiving the embossment 1A of the u-shaped bracket 1. The end portion of each of the first and the second stabilizing member 5 is accommodated between flaps of the respective U-shaped hinge bracket 1 and mounted thereto using typical mounting hardware 4 comprising, for example, a hex bolt and a self locking nut. The bolt is disposed in bore 10 of the stabilizing member 5 and respective bores 1 B in the flaps of the U-shaped hinge bracket 1 and is then fastened to a predetermined torque using the respective self locking nut to enable the stabilizing members 5 to rotate around the bolt forming the axis 102.
Preferably, the stabilizing members 5 are made of commercially available lumber such as, for example, 2 X 4 or 2 X 6 boards depending on the length of the stabilizing member 5 to ensure sufficient stiffness. Of course, other materials are also employable as stabilizing members 5, for example, fiberglass. However, 2 X 4 or 2 X 6 boards are preferred because they are readily available, easy to cut, relatively light weight, and electrically non-conducting. The boards are cut Page 6 of 12 to a predetermined length, preferably, the distance between the location where the stabilizing member 5 is mounted to the ladder 20 and the bottom end of the frame rail 14 of the ladder 20. A
clearance 11 is cut at the top end portion of the stabilizing member 5 to enable rotation of the stabilizing member 5 about the axis 102 and a mitre cut 9 is provided at the bottom portion of the stabilizing member 5 to improve ground engagement of the stabilizing member 5.
Alternatively, a base member having a substantially flat surface for engaging uneven or sloped ground is rotatable attached to the bottom portion of the stabilizing members 5.
Optionally, level and angle of inclination indicators 12 - made of, for example, wire - are loosely mounted to the stabilizing member 5 using, for example, wood screws 13 at a location where it can be easily viewed when the ladder 20 is in an upright position. At the location of the indicator 12, a line is inscribed on the stabilizing member 5 representing approximately a 15 angle to the vertical. Use of the level and angle of inclination indicators 12 will be described herein below.
Preferably, a connecting structure directly connects the bottom portions of the stabilizing members 5 and provides a pulling action when extended. The connecting structure comprises, for example, one or more bungee cords 7 which are connected to plastic tie-wraps 6 attached to the respective bottom portions of the stabilizing members 5 via bores 8. The connecting structure prevents slipping of the stabilizing members 5 when the ladder 20 is in use by maintaining the distance between the bottom portions of the stabilizing members 5, but also facilitates set up by enabling extension of the same.
The ladder stabilizing device 100 is easy to manufacture using off-the-shelf hardware components, as well as easy to assemble and install. For example, the components described herein above and illustrated in Figure lb are provided as a kit for the customer to assemble and install using standard do-it-yourself tools. To safe space and shipping cost the stabilizing members 5 are not provided but are readily available, for example, as standard 2 X 4 or 2 X 6 at any lumber or home improvement store. Furthermore, the same ladder stabilizing device 100 is employable for a wide variety of extension ladders with only the stabilizing elements 5 being adjusted accordingly.
Page 7 of 12 Alternatively, the rod 2 is mounted to the frame rails 14 of the ladder 20 using, for example, two U-shaped brackets designed such that the flaps of the U-shaped brackets accommodate the respective frame rail 14 there between. The U-shaped bracket is clamped to the frame rail 14 using a bolt and locking nut. The rod 2 is accommodated in respective bores disposed at a predetermined location in the flaps of the U-shaped brackets and mounted thereto using standard hardware components as described herein above. Employment of the U-shaped brackets enables mounting of the ladder stabilizing device 100 to ladders absent hollow rungs without weakening the structure of the ladder by drilling holes into the frame rails.
Figures 2a and 2b illustrate an extension ladder 20 having the ladder stabilizing device mounted thereto and the stabilizing elements 5 secured to the outside of the frame rails of the ladder 20.
Preferably, the bungee cords 7 are used for securing the stabilizing elements 5 to the frame rails during storage, transport and handling of the ladder 20, thus minimizing the number of components employed. As is evident, the extension ladder 20 with the ladder stabilizing device 100 is easy to transport and no additional components need to be carried.
The extension ladder 20 with the ladder stabilizing device 100 is erected in the usual fashion and leaned against a surface such as a wall, as illustrated in Figure 3a. Of course, care has to be taken that the extension ladder 20 is securely anchored. If the ground is sloped or uneven the bottom end of the extension ladder 20 is levelled, for example, by disposing shims under the floating frame rail of the extension ladder 20. To ensure placement of the extension ladder 20 at a correct angle of approximately 15 , the extension ladder 20 is adjusted until the indicator 12 is approximately aligned with the line 30 marked on the stabilizing member 5.
After the extension ladder 20 is correctly erected the bungee cords 7 are removed from the storage and transport position. The stabilizing members 5 are then swung outwards from the frame rails around the axes 102 as well as towards the wall around the axis 101 until they are lowered plumb and placed in a plane parallel to the wall, as illustrated in Figures 3b and 3c. In this position the stabilizing elements 5 are then engaged with the ground 22 and the bottom portions of the stabilizing elements 5 are connected to each other using the bungee cords 7, as described herein above, to prevent the same from slipping during use of the extension ladder 20.
Page 8 of 12 If the bungee cords 7 are of insufficient length a sufficiently long piece of rope is employed to extend the connection. When used with extension ladders of longer overall length a longer piece of rope together with the bungee cords is employed to form the connection due to a wider spread of the bottom portions of the stabilizing elements 5. On soft ground, the mitre cut tips 9 of the stabilizing elements 5 are pushed to penetrate into the ground.
When set up, the stabilizing elements 5 form an approximate inverted V-shape depending on the slope of the ground 22, 24, as illustrated in Figure 3c showing a set up on approximate level ground 22 and sloped ground 24 (indicated by dashed lines). The ladder stabilizing device 100 provides further flexibility to adjust to uneven and sloped ground by allowing further independent rotational movement of the stabilizing elements 5 around the axes 101 and 102. As illustrated in Figures 3b and 3d, the stabilizing elements 5 are movable in a wide range towards the wall and away from the wall depending on the ground, thus enabling the user to find a proper location for engaging the stabilizing elements 5 with the ground.
If the slope is severe such that a stabilizing element 5 is too short to engage the ground, an extension member 16 is mounted thereto using, for example, wood screws, as illustrated in Figure 3e. The extension member 16 is, for example, made by the user by cutting an additional piece of 2 X 4 or 2 X 6 of appropriate length including a sufficient overlap of two feet or more.
The present invention has been described herein with regard to preferred embodiments. However, it will be obvious to persons skilled in the art that a number of variations and modifications can be made without departing from the scope of the invention as described herein.
Page 9 of 12
FIELD OF THE INVENTION
The present invention relates to the field of ladder stabilizing devices, and more particularly to a ladder stabilizing device for stabilizing an extension ladder to prevent the extension ladder from slipping sideways.
BACKGROUND OF THE INVENTION
Extension ladders are very effective tools enabling a person to reach locations high above ground in a simple fashion for performing various tasks such as, for example, cleaning, painting, or repair. Extension ladders are commonly used by workers in performance of their occupation as well as individuals performing various tasks in a do-it-yourself fashion.
Extension ladders usually comprise two or more ladder portions with each ladder portion having a pair of parallel frame rails spaced apart and connected by a plurality of rungs. Typically, an upper portion of an extension ladder is leaned against a supporting surface such as, for example, a wall or roof structure of a building. When properly placed on a flat and stable surface extension ladders are usually relatively stable.
However, accidents frequently occur because the upper portion of the extension ladder slipping sideways. Such accidents are particularly likely when the extension ladder is used on uneven or sloping ground and when a person is at or near the top of the extension ladder resulting in severe injuries or death.
Various ladder stabilizing devices have been disclosed such as, for example, in: US Patent 7,163,084 (Blehm); US Patent 6,672,427 (Sheffield); US Patent 6,527,084 (Hrincu); US Patent 5,868,222 (Charbonneau); and US Patent 4,949,809 (Levi et al.). Unfortunately, these devices are complex and cost intensive to manufacture by employing telescopic components, difficult to install by having to mount various components to the ladder at more than two locations, and cumbersome to use by having to transport the various components and setting the various Page 1 of 12 components up in a proper fashion.
It is desirable to provide a ladder stabilizing device for stabilizing an extension ladder that is simple to set up.
It is also desirable to provide a ladder stabilizing device for stabilizing an extension ladder that is simple to mount to an existing extension ladder.
It is also desirable to provide a ladder stabilizing device for stabilizing an extension ladder that is simple and cost effective to manufacture.
SUMMARY OF THE INVENTION
Accordingly, one object of the present invention is to provide a ladder stabilizing device for stabilizing an extension ladder that is simple to set up.
Another object of the present invention is to provide a ladder stabilizing device for stabilizing an extension ladder that is simple to mount to an existing extension ladder.
Another object of the present invention is to provide a ladder stabilizing device for stabilizing an extension ladder that is simple and cost effective to manufacture.
According to one aspect of the present invention, there is provided a device for stabilizing a ladder. The device for stabilizing a ladder comprises a first stabilizing member having a predetermined fixed first length and a second stabilizing member having a predetermined fixed second length. The device for stabilizing a ladder further comprises a support structure for being mounted to the ladder at a predetermined location. The support structure is mounted to an upper portion of the first and the second stabilizing member, respectively. The support structure holds the upper portion of the first and the second stabilizing member in proximity of a first frame rail and a second frame rail of the ladder, respectively, such that each of the first and the second stabilizing members is independently rotatable around a first axis oriented substantially parallel Page 2 of 12 to rungs of the ladder and around a second axis oriented substantially perpendicular to the first axis.
According to another aspect of the present invention, there is further provided a device for stabilizing a ladder. The device for stabilizing a ladder comprises a support structure for being mounted to the ladder at a predetermined location and for being mounted to an upper portion of a first and a second stabilizing member, respectively. In operation, the support structure holds the upper portion of the first and the second stabilizing member in proximity of a first frame rail and a second frame rail of the ladder, respectively, such that each of the first and the second stabilizing members is independently rotatable around a first axis oriented substantially parallel to rungs of the ladder and around a second axis oriented substantially perpendicular to the first axis.
The advantage of the present invention is that it provides a ladder stabilizing device for stabilizing an extension ladder that is simple to set up.
A further advantage of the present invention is that it provides a ladder stabilizing device for stabilizing an extension ladder that is simple to mount to an existing extension ladder.
A further advantage of the present invention is that it provides a ladder stabilizing device for stabilizing an extension ladder that is simple and cost effective to manufacture.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention is described below with reference to the accompanying drawings, in which:
Figure 1 a is a simplified diagram illustrating a perspective view of a ladder stabilizing device according to a preferred embodiment of the invention;
Figure lb is a simplified block diagram illustrating an exploded view of the ladder Page 3 of 12 stabilizing device according to a preferred embodiment of the invention;
Figures 1c and 1d are simplified block diagrams illustrating a side view and a front view, respectively, of a hinge bracket of the ladder stabilizing device according to a preferred embodiment of the invention;
Figure 1 e is a simplified block diagram illustrating a front view of a portion of an extension ladder with the support structure of the ladder stabilizing device according to a preferred embodiment of the invention;
Figures if, lg and lh are perspective views of a self centering washer for use in one embodiment of the present invention;
Figure 1 i is a perspective view of a portion of the present invention, in exploded view;
Figures 2a and 2b are simplified block diagrams illustrating an extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention in a transport position;
Figure 3a is a simplified block diagram illustrating a side view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention in a transport position;
Figure 3b is a simplified block diagram illustrating a side view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention set up;
Figure 3c is a simplified block diagram illustrating a front view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention set up;
Page 4 of 12 Figure 3d is a simplified block diagram illustrating a top view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention set up; and, Figure 3e is a simplified block diagram illustrating a front view of an erected extension ladder with the ladder stabilizing device according to a preferred embodiment of the invention set up and with one stabilizing element having an extension mounted thereto.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs.
Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods and materials are now described.
While embodiments of the invention will be described for use with an extension ladder for the sake of simplicity, it will become evident to those skilled in the art that the embodiments of the invention are not limited thereto, but are also applicable for use with other types of ladders such as, for example, non-extendable ladders and folding ladders.
Referring to Figures 1 a to 1 i, a ladder stabilizing device 100 according to a preferred embodiment of the invention is provided. The ladder stabilizing device 100 according to the preferred embodiment of the invention comprises a first and a second stabilizing member 5 with each having a predetermined fixed length. The fixed length is determined such that a user is enabled to stabilize a ladder 20 on an uneven or sloped surface as will be described herein below.
A support structure 1, 2, 3, 4, and 17 is mounted to the ladder 20 at a predetermined location -typically dependent upon the overall length of the extended ladder 20. The support structure 1, 2, 3, 4, and 17 is mounted to an upper portion of the first and the second stabilizing member 5, respectively. The support structure holds the first and the second stabilizing member 5 in proximity of a left hand side frame rail 14 and a right hand side frame rail 14 of the ladder 20, Page 5 of 12 respectively. Each of the first and the second stabilizing members 5 is independently rotatable around a first axis 101 oriented substantially parallel to rungs 15 of the ladder 20 and around a second axis 102 oriented substantially perpendicular to the first axis 101.
Figure lb, illustrates an exploded view of the ladder stabilizing device 100 according to the preferred embodiment of the invention. Preferably, the support structure comprises a rod 2 - for example, a threaded rod or a rod having threaded end portions made of stainless steel or Zinc plated steel - for being mounted to the ladder 20. The rod 2 forms the first axis 101 and has at each of the threaded end portions a U-shaped hinge bracket 1 mounted thereto using typical hardware such as, for example, flat washers and self locking nuts 3 such that the hinge brackets 1 are enabled to pivot around the rod 2 using, for example, a predetermined torque setting when fastening the nuts. Preferably, the rod 2 is disposed within a bore of a hollow rung 15 of the ladder 20 and centered using a centering member. Depending on the size of the bore an embossment 1A of the hinge bracket 1 is used as centering member, as illustrated in Figures 1 c and ld. Alternatively, a self centering washer 17 - for example, a self centering Nylon washer -is employed, as illustrated in Figures lb, If, lg and lh, having a hole 17b therethrough for receiving the rod 2 and having a male centering portion 17b for whole or partial insertion into the hollow horizontal rung 15 and having a female recessed area 17c illustrated in Figure if for receiving the embossment 1A of the u-shaped bracket 1. The end portion of each of the first and the second stabilizing member 5 is accommodated between flaps of the respective U-shaped hinge bracket 1 and mounted thereto using typical mounting hardware 4 comprising, for example, a hex bolt and a self locking nut. The bolt is disposed in bore 10 of the stabilizing member 5 and respective bores 1 B in the flaps of the U-shaped hinge bracket 1 and is then fastened to a predetermined torque using the respective self locking nut to enable the stabilizing members 5 to rotate around the bolt forming the axis 102.
Preferably, the stabilizing members 5 are made of commercially available lumber such as, for example, 2 X 4 or 2 X 6 boards depending on the length of the stabilizing member 5 to ensure sufficient stiffness. Of course, other materials are also employable as stabilizing members 5, for example, fiberglass. However, 2 X 4 or 2 X 6 boards are preferred because they are readily available, easy to cut, relatively light weight, and electrically non-conducting. The boards are cut Page 6 of 12 to a predetermined length, preferably, the distance between the location where the stabilizing member 5 is mounted to the ladder 20 and the bottom end of the frame rail 14 of the ladder 20. A
clearance 11 is cut at the top end portion of the stabilizing member 5 to enable rotation of the stabilizing member 5 about the axis 102 and a mitre cut 9 is provided at the bottom portion of the stabilizing member 5 to improve ground engagement of the stabilizing member 5.
Alternatively, a base member having a substantially flat surface for engaging uneven or sloped ground is rotatable attached to the bottom portion of the stabilizing members 5.
Optionally, level and angle of inclination indicators 12 - made of, for example, wire - are loosely mounted to the stabilizing member 5 using, for example, wood screws 13 at a location where it can be easily viewed when the ladder 20 is in an upright position. At the location of the indicator 12, a line is inscribed on the stabilizing member 5 representing approximately a 15 angle to the vertical. Use of the level and angle of inclination indicators 12 will be described herein below.
Preferably, a connecting structure directly connects the bottom portions of the stabilizing members 5 and provides a pulling action when extended. The connecting structure comprises, for example, one or more bungee cords 7 which are connected to plastic tie-wraps 6 attached to the respective bottom portions of the stabilizing members 5 via bores 8. The connecting structure prevents slipping of the stabilizing members 5 when the ladder 20 is in use by maintaining the distance between the bottom portions of the stabilizing members 5, but also facilitates set up by enabling extension of the same.
The ladder stabilizing device 100 is easy to manufacture using off-the-shelf hardware components, as well as easy to assemble and install. For example, the components described herein above and illustrated in Figure lb are provided as a kit for the customer to assemble and install using standard do-it-yourself tools. To safe space and shipping cost the stabilizing members 5 are not provided but are readily available, for example, as standard 2 X 4 or 2 X 6 at any lumber or home improvement store. Furthermore, the same ladder stabilizing device 100 is employable for a wide variety of extension ladders with only the stabilizing elements 5 being adjusted accordingly.
Page 7 of 12 Alternatively, the rod 2 is mounted to the frame rails 14 of the ladder 20 using, for example, two U-shaped brackets designed such that the flaps of the U-shaped brackets accommodate the respective frame rail 14 there between. The U-shaped bracket is clamped to the frame rail 14 using a bolt and locking nut. The rod 2 is accommodated in respective bores disposed at a predetermined location in the flaps of the U-shaped brackets and mounted thereto using standard hardware components as described herein above. Employment of the U-shaped brackets enables mounting of the ladder stabilizing device 100 to ladders absent hollow rungs without weakening the structure of the ladder by drilling holes into the frame rails.
Figures 2a and 2b illustrate an extension ladder 20 having the ladder stabilizing device mounted thereto and the stabilizing elements 5 secured to the outside of the frame rails of the ladder 20.
Preferably, the bungee cords 7 are used for securing the stabilizing elements 5 to the frame rails during storage, transport and handling of the ladder 20, thus minimizing the number of components employed. As is evident, the extension ladder 20 with the ladder stabilizing device 100 is easy to transport and no additional components need to be carried.
The extension ladder 20 with the ladder stabilizing device 100 is erected in the usual fashion and leaned against a surface such as a wall, as illustrated in Figure 3a. Of course, care has to be taken that the extension ladder 20 is securely anchored. If the ground is sloped or uneven the bottom end of the extension ladder 20 is levelled, for example, by disposing shims under the floating frame rail of the extension ladder 20. To ensure placement of the extension ladder 20 at a correct angle of approximately 15 , the extension ladder 20 is adjusted until the indicator 12 is approximately aligned with the line 30 marked on the stabilizing member 5.
After the extension ladder 20 is correctly erected the bungee cords 7 are removed from the storage and transport position. The stabilizing members 5 are then swung outwards from the frame rails around the axes 102 as well as towards the wall around the axis 101 until they are lowered plumb and placed in a plane parallel to the wall, as illustrated in Figures 3b and 3c. In this position the stabilizing elements 5 are then engaged with the ground 22 and the bottom portions of the stabilizing elements 5 are connected to each other using the bungee cords 7, as described herein above, to prevent the same from slipping during use of the extension ladder 20.
Page 8 of 12 If the bungee cords 7 are of insufficient length a sufficiently long piece of rope is employed to extend the connection. When used with extension ladders of longer overall length a longer piece of rope together with the bungee cords is employed to form the connection due to a wider spread of the bottom portions of the stabilizing elements 5. On soft ground, the mitre cut tips 9 of the stabilizing elements 5 are pushed to penetrate into the ground.
When set up, the stabilizing elements 5 form an approximate inverted V-shape depending on the slope of the ground 22, 24, as illustrated in Figure 3c showing a set up on approximate level ground 22 and sloped ground 24 (indicated by dashed lines). The ladder stabilizing device 100 provides further flexibility to adjust to uneven and sloped ground by allowing further independent rotational movement of the stabilizing elements 5 around the axes 101 and 102. As illustrated in Figures 3b and 3d, the stabilizing elements 5 are movable in a wide range towards the wall and away from the wall depending on the ground, thus enabling the user to find a proper location for engaging the stabilizing elements 5 with the ground.
If the slope is severe such that a stabilizing element 5 is too short to engage the ground, an extension member 16 is mounted thereto using, for example, wood screws, as illustrated in Figure 3e. The extension member 16 is, for example, made by the user by cutting an additional piece of 2 X 4 or 2 X 6 of appropriate length including a sufficient overlap of two feet or more.
The present invention has been described herein with regard to preferred embodiments. However, it will be obvious to persons skilled in the art that a number of variations and modifications can be made without departing from the scope of the invention as described herein.
Page 9 of 12
Claims (11)
1. A device for stabilizing a ladder comprising:
a first stabilizing member having a predetermined fixed first length;
a second stabilizing member having a predetermined fixed second length; and, a support structure for being mounted to the ladder at a predetermined location, the support structure being mounted to an upper portion of the first and the second stabilizing member, respectively, the support structure for holding the upper portion of the first and the second stabilizing member in proximity of a first frame rail and a second frame rail of the ladder, respectively, such that each of the first and the second stabilizing members is independently rotatable around a first axis oriented substantially parallel to rungs of the ladder and around a second axis oriented substantially perpendicular to the first axis.
a first stabilizing member having a predetermined fixed first length;
a second stabilizing member having a predetermined fixed second length; and, a support structure for being mounted to the ladder at a predetermined location, the support structure being mounted to an upper portion of the first and the second stabilizing member, respectively, the support structure for holding the upper portion of the first and the second stabilizing member in proximity of a first frame rail and a second frame rail of the ladder, respectively, such that each of the first and the second stabilizing members is independently rotatable around a first axis oriented substantially parallel to rungs of the ladder and around a second axis oriented substantially perpendicular to the first axis.
2. A device for stabilizing a ladder as defined in claim 1 wherein the fixed first length and the fixed second length are predetermined such that stabilizing of the ladder on a sloped surface is enabled.
3. A device for stabilizing a ladder as defined in claim 2 wherein the fixed first length and the fixed second length are a same length.
4. A device for stabilizing a ladder as defined in claim 1 wherein the support structure comprises a rod for being mounted to the ladder, the rod forming the first axis and having at a first and a second end portion a first and a second hinge bracket mounted thereto, respectively, the first and the second hinge bracket being rotatable mounted to the upper portion of the first and the second stabilizing member, respectively.
5. A device for stabilizing a ladder as defined in claim 4 wherein the support structure comprises a centering member for centering the rod in a bore of one of the rungs of the ladder.
6. A device for stabilizing a ladder as defined in claim 1 comprising a connecting structure for directly connecting a lower portion of the first stabilizing member with a respective lower portion of the second stabilizing member.
7. A device for stabilizing a ladder as defined in claim 6 wherein the connecting structure comprises a mechanism for providing a pulling action when extended.
8. A device for stabilizing a ladder as defined in claim 7 wherein the mechanism for providing a pulling action comprises a bungee cord.
9. A device for stabilizing a ladder comprising a support structure for being mounted to the ladder at a predetermined location and for being mounted to an upper portion of a first and a second stabilizing member, respectively, the support structure for holding the upper portion of the first and the second stabilizing member in proximity of a first frame rail and a second frame rail of the ladder, respectively, such that each of the first and the second stabilizing members is independently rotatable around a first axis oriented substantially parallel to rungs of the ladder and around a second axis oriented substantially perpendicular to the first axis.
10. A device for stabilizing a ladder as defined in claim 9 comprising a connecting structure for being mounted to a lower portion of the first stabilizing member and a respective lower portion of the second stabilizing member for directly connecting the same, the connecting structure comprising a mechanism for providing a pulling action when extended.
11. A device for stabilizing a ladder as defined in claim 9 wherein the support structure comprises a rod for being mounted to the ladder, the rod forming the first axis and having at a first and a second end portion a first and a second hinge bracket mounted thereto, respectively, the first and the second hinge bracket for being rotatable mounted to the upper portion of the first and the second stabilizing member, respectively.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2693530 CA2693530A1 (en) | 2009-12-20 | 2010-02-18 | Ladder stabilizing device |
| CA2705995A CA2705995C (en) | 2009-12-18 | 2010-06-04 | Improved ladder stabilizing device |
| US12/857,106 US8590671B2 (en) | 2009-12-18 | 2010-08-16 | Ladder stabilizing device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2,690,504 | 2009-12-18 | ||
| CA 2690504 CA2690504A1 (en) | 2009-12-21 | 2009-12-21 | "ladder-adder" ladder stabilizing device |
| CA 2693530 CA2693530A1 (en) | 2009-12-20 | 2010-02-18 | Ladder stabilizing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2693530A1 true CA2693530A1 (en) | 2011-06-20 |
Family
ID=44192769
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2690504 Abandoned CA2690504A1 (en) | 2009-12-18 | 2009-12-21 | "ladder-adder" ladder stabilizing device |
| CA 2693530 Abandoned CA2693530A1 (en) | 2009-12-18 | 2010-02-18 | Ladder stabilizing device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2690504 Abandoned CA2690504A1 (en) | 2009-12-18 | 2009-12-21 | "ladder-adder" ladder stabilizing device |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA2690504A1 (en) |
-
2009
- 2009-12-21 CA CA 2690504 patent/CA2690504A1/en not_active Abandoned
-
2010
- 2010-02-18 CA CA 2693530 patent/CA2693530A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CA2690504A1 (en) | 2011-06-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20130218 |