Title:
SAFETY LADDER BRACE
United States Patent 3715012
Abstract:
A safety device for supporting an upper end portion of a ladder having a pair of side rails joined by rungs wherein the safety device includes a body member having a pair of diverging arms forming a generally V-shape, each having an extension with the extensions being in substantially normal planes and a flange extending outwardly from a free end of each of the extensions with the flanges being substantially coplanar and a wing extending outwardly from each of the diverging arms and having a portion engageable with a respective side rail of the ladder and a clamping member on each wing for securing the respective side rails of the ladder thereto.
US Patent References:
Ladder attachment
Chubbs - September 1959 - 2903086
Pole rest attachments for ladders
Palmquist - October 1957 - 2808975
Platform for ladders
Christie - May 1967 - 3318415
Stand-off ladder bracket
Peters - January 1963 - 3072218
/1096903.html
Graham - May 1914 - 1096903
Ladder attachment
Chubbs - September 1959 - 2903086
Pole rest attachments for ladders
Palmquist - October 1957 - 2808975
Platform for ladders
Christie - May 1967 - 3318415
Stand-off ladder bracket
Peters - January 1963 - 3072218
/1096903.html
Graham - May 1914 - 1096903
Application Number:
05/184054
Publication Date:
02/06/1973
Filing Date:
09/27/1971
View Patent Images:
Export Citation:
Primary Class:
Other Classes:
182/214
International Classes:
E06C7/48; E06C7/00; E06C7/48
Field of Search:
182/214,107,108
US Patent References:
Primary Examiner:
Machado, Reinaldo P.
Claims:
What I claim and desire to secure by Letters Patent is
1. A safety device for ladders having a pair of spaced side rails, said safety device comprising:
2. A safety device as set forth in claim 1 including a flange extending outwardly from a free end of each of said extensions, said flanges being substantially coplanar.
3. A safety device for ladders as set forth in claim 2 including resilient material mounted on surfaces of said diverging arms and extensions and flanges and positioned for engagement with respective surfaces to support an upper portion of the ladder.
4. A safety device for ladders having a pair of laterally spaced side rails joined by spaced rungs, said safety device comprising:
5. A safety device for ladders as set forth in claim 4 including:
6. A safety device for ladders as set forth in claim 5 wherein:
7. A safety device for ladders having a pair of spaced side rails, said safety device comprising:
8. A safety device for ladders as set forth in claim 1 and including:
1. A safety device for ladders having a pair of spaced side rails, said safety device comprising:
2. A safety device as set forth in claim 1 including a flange extending outwardly from a free end of each of said extensions, said flanges being substantially coplanar.
3. A safety device for ladders as set forth in claim 2 including resilient material mounted on surfaces of said diverging arms and extensions and flanges and positioned for engagement with respective surfaces to support an upper portion of the ladder.
4. A safety device for ladders having a pair of laterally spaced side rails joined by spaced rungs, said safety device comprising:
5. A safety device for ladders as set forth in claim 4 including:
6. A safety device for ladders as set forth in claim 5 wherein:
7. A safety device for ladders having a pair of spaced side rails, said safety device comprising:
8. A safety device for ladders as set forth in claim 1 and including:
Description:
The present invention relates to safety devices for supporting an upper end portion of a ladder and more particularly to a safety device adapted to engage objects against which the ladder is placed such as a generally rounded object, as a pole or tree, a corner of a building and a side wall of a building with an absence of lateral movement of the ladder.
When an upper end portion of a ladder having a pair of laterally spaced side rails joined by rungs is placed in engagement with a rounded object such as a pole, tree, or the like, or a corner of a building, only the upper rung engages the supporting object and the ladder tends to rock, tip, or the like movement whereby the ladder and person thereon may fall. Also when the lower end portion of the ladder is placed on a yielding surface, such as soft ground, and the top of the ladder is placed in engagement with a rounded object or a corner of a building, the ladder may also move laterally thereby causing the person thereon to fall.
The principal objects of the present invention are: to provide a safety device for supporting an upper end portion of ladders having side rails joined by rungs and avoiding the difficulties experienced with such ladders when placed against generally rounded objects, building corners, and the like; to provide such a safety device which is versatile in use wherein the safety device has respective portions adapted to supportingly engage an exterior surface of a rounded object such as a pole, tree, a corner of a building and a generally planar wall surface; to provide such a safety device for ladders wherein respective portions of a body member of the safety device for ladders are adapted to receive the rounded object or the corner of a building with a wedging action between the respective portions of a body member; to provide such a safety device for ladders having resilient material on respective surface engaging portions to frictionally engage the respective supporting surface; to provide such a safety device for ladders effecting optimum engagement with a surface against which the ladder is placed and frictional engagement aiding in holding the ladder against movement; and to provide such a safety device for ladders which is economical to manufacture, durable in use, simple to install on an upper end portion of a ladder, and particularly well adapted for the intended use.
Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawings wherein are set forth by way of illustration and example certain embodiments of this invention.
FIG. 1 is a perspective view of a safety device for supporting an upper end portion of a ladder and embodying features of the present invention.
FIG. 2 is a side elevational view of the safety device shown supporting a ladder on a generally cylindrical object.
FIG. 3 is a transverse sectional view taken on line 3--3, FIG. 2 and showing resilient material mounted on the body member.
FIG. 4 is a plan view showing the safety device engaging a generally cylindrical object.
FIG. 5 is a plan view showing the safety device engaging substantially perpendicular wall surfaces, such as at a building corner.
FIG. 6 is a plan view showing the safety device engaging a generally planar wall surface.
Referring more in detail to the drawings:
As required detailed embodiments of the present invention are disclosed herein, however, it is to be understood that the disclosed embodiments are merely exemplary of the invention which may be embodied in various forms. Therefore, specific structural functional details disclosed herein are not to be interpreted as limiting but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriate detailed structure.
In the disclosed embodiment of the present invention, the referenced numeral 1 generally designates a safety device for supporting an upper end portion 2 of a ladder 3 having a pair of laterally spaced side rails 4 and 5 joined by a plurality of vertically or longitudinally spaced rungs 6. The safety device 1 is adapted to support and prevent lateral movement of the upper end portion 2 of the ladder 3 on a plurality of different shaped objects, including generally cylindrical objects, such as poles and trees, and intersecting surfaces, such as building corners, and planar surfaces, such as building walls.
In the disclosed embodiment, the safety device 1 includes a body member 7 having a pair of diverging arms 8 and 9 forming a generally V-shape and having extensions 10 and 11 respectively positioned in substantially normal planes adapted to engage building corners and the like. The body member 7 has flanges 12 and 13 extending outwardly from a free end of the extensions 10 and 11 respectively with the flanges 12 and 13 being substantially coplanar to engage a planar surface.
Wings 14 and 15 extend outwardly from the diverging arms 8 and 9 respectively and have portions 16 and 17 engageable with respective side rails 4 and 5 of the ladder 3 and clamping members 18 and 19 secured to the wings 14 and 15 and the side rails 4 and 5 respectively for securing the safety device 1 on the upper end portion 2 of the ladder 3.
The illustrated body member 7 has a forward end 20 with the diverging arms 8 and 9 extending rearwardly therefrom. The diverging arms 8 and 9 are generally planar members preferably of flat metal strip and having upper and lower edges 21 and 22 respectively adapted to be positioned in respective planes substantially parallel with a supporting surface 23 for a lower end portion 24 of the ladder 3 whereby flat faces of the arms lie against the surface of an object against which the ladder is leaned. The diverging arms 8 and 9 are positioned to define and include an angle preferably less than about 60°.
It is desirable to protect the respective surfaces engaged by the body member 7 while supporting the upper end portion 2 of the ladder 3. It is also desirable to insulate the body member 7 particularly when formed of metal, from the respective surfaces, therefore, resilient material 25 is mounted on facing surfaces 26 and 27 of the diverging arms 8 and 9 and on surfaces 28 and 29 of the extensions 10 and 11 and on rearwardly facing surfaces 30 and 31 of the flanges 12 and 13. The resilient material 25 is engageable with respective surfaces to support the upper end portion 2 of the ladder 3 and provide a frictional engagement aiding in holding the ladder against movement.
The extensions 10 and 11 extend from the arms 8 and 9 respectively and at an angle therewith to position the extensions 10 and 11 in substantially perpendicular or normal planes. The resilient material 25 on the extensions 10 and 11 is positioned to engage intersecting surfaces which are substantially perpendicular, such as building corners and the like.
The flanges 12 and 13 extend outwardly from free ends of the extensions 10 and 11 respectively and at an angle therewith to position the flanges 12 and 13 substantially coplanar wherein the resilient material 25 thereon is positioned to engage a generally planar surface, such as building walls and the like.
The wings 14 and 15 are generally planar members each having one end suitably secured to the body 7 and extending outwardly therefrom. The wings 14 and 15 have the portions 16 and 17 respectively which are inclined relative to the plane of the upper edges 21 of the diverging arms 8 and 9 whereby the ladder 3 may be suitably inclined with the safety device being in a substantially horizontal plane thereby providing optimum engagement with a surface against which the ladder 3 is placed.
Suitable means are provided on each of the inclined portions 16 and 17 of the wings 14 and 15 for securing the respective side rails 4 and 5 of the ladder 3 thereto. The clamping members 18 and 19 are illustrated as U-bolts having suitable fasteners thereon, such as wing nuts 32 and 33 respectively. The inclined portions 16 and 17 of the wings 14 and 15 respectively have a plurality of spaced apertures 34 therein for the U-bolts 18 and 19 to extend therethrough.
In using a safety device for ladders constructed as illustrated and described, the clamping members or U-bolts 18 and 19 are secured to respective side rails 4 and 5 to position and secure the safety device 1 on the upper end portion 2 of the ladder 3. When the ladder 3 is to be supported relative to a generally rounded member, such as a wooden or metal pole, tree or the like, the safety device 1 is positioned with the generally rounded object between the diverging arms 8 and 9. The safety device 1 and the upper end portion 2 of the ladder 3 are then moved toward said rounded object. The diverging arms 8 and 9 extend rearwardly from the forward end 20 of the body member 7 with the diverging arms having sufficient resiliency to permit a generally rounded object to effect some spreading of the arms 8 and 9 to thereby substantially wedge same between the diverging arms 8 and 9 and the resilient material 25 thereon. The resilient material 25 is particularly effective to frictionally engage metal poles and the like and to electrically insulate the safety device 1 and the ladder 3 from the respective metal pole. When the safety device 1 is to support an upper end portion 2 of the ladder 3 relative to substantially normal intersecting surfaces, such as at a building corner, the body member 7 is moved toward the corner and the diverging arms 8 and 9 are spread whereby the intersecting surfaces are wedged between the extensions 10 and 11 with the resilient material 25 thereon cooperating with the wedging action and frictionally engaging the respective intersecting surfaces of the building corner. When the safety device 1 is to support an upper end portion 2 of the ladder 3 relative to a generally planar surface, the flanges 12 and 13 and the resilient material 25 thereon is moved into engagement with the respective planar surface with the resilient material 25 thereon is moved into engagement with the respective planar surface with the resilient material 25 protecting the finish or surface of the respective wall to prevent damage from engagement by the safety device 1.
It is to be understood that while I have illustrated and described one form of my invention it is not to be limited to the specific form or arrangement of parts herein described and shown.
When an upper end portion of a ladder having a pair of laterally spaced side rails joined by rungs is placed in engagement with a rounded object such as a pole, tree, or the like, or a corner of a building, only the upper rung engages the supporting object and the ladder tends to rock, tip, or the like movement whereby the ladder and person thereon may fall. Also when the lower end portion of the ladder is placed on a yielding surface, such as soft ground, and the top of the ladder is placed in engagement with a rounded object or a corner of a building, the ladder may also move laterally thereby causing the person thereon to fall.
The principal objects of the present invention are: to provide a safety device for supporting an upper end portion of ladders having side rails joined by rungs and avoiding the difficulties experienced with such ladders when placed against generally rounded objects, building corners, and the like; to provide such a safety device which is versatile in use wherein the safety device has respective portions adapted to supportingly engage an exterior surface of a rounded object such as a pole, tree, a corner of a building and a generally planar wall surface; to provide such a safety device for ladders wherein respective portions of a body member of the safety device for ladders are adapted to receive the rounded object or the corner of a building with a wedging action between the respective portions of a body member; to provide such a safety device for ladders having resilient material on respective surface engaging portions to frictionally engage the respective supporting surface; to provide such a safety device for ladders effecting optimum engagement with a surface against which the ladder is placed and frictional engagement aiding in holding the ladder against movement; and to provide such a safety device for ladders which is economical to manufacture, durable in use, simple to install on an upper end portion of a ladder, and particularly well adapted for the intended use.
Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawings wherein are set forth by way of illustration and example certain embodiments of this invention.
FIG. 1 is a perspective view of a safety device for supporting an upper end portion of a ladder and embodying features of the present invention.
FIG. 2 is a side elevational view of the safety device shown supporting a ladder on a generally cylindrical object.
FIG. 3 is a transverse sectional view taken on line 3--3, FIG. 2 and showing resilient material mounted on the body member.
FIG. 4 is a plan view showing the safety device engaging a generally cylindrical object.
FIG. 5 is a plan view showing the safety device engaging substantially perpendicular wall surfaces, such as at a building corner.
FIG. 6 is a plan view showing the safety device engaging a generally planar wall surface.
Referring more in detail to the drawings:
As required detailed embodiments of the present invention are disclosed herein, however, it is to be understood that the disclosed embodiments are merely exemplary of the invention which may be embodied in various forms. Therefore, specific structural functional details disclosed herein are not to be interpreted as limiting but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriate detailed structure.
In the disclosed embodiment of the present invention, the referenced numeral 1 generally designates a safety device for supporting an upper end portion 2 of a ladder 3 having a pair of laterally spaced side rails 4 and 5 joined by a plurality of vertically or longitudinally spaced rungs 6. The safety device 1 is adapted to support and prevent lateral movement of the upper end portion 2 of the ladder 3 on a plurality of different shaped objects, including generally cylindrical objects, such as poles and trees, and intersecting surfaces, such as building corners, and planar surfaces, such as building walls.
In the disclosed embodiment, the safety device 1 includes a body member 7 having a pair of diverging arms 8 and 9 forming a generally V-shape and having extensions 10 and 11 respectively positioned in substantially normal planes adapted to engage building corners and the like. The body member 7 has flanges 12 and 13 extending outwardly from a free end of the extensions 10 and 11 respectively with the flanges 12 and 13 being substantially coplanar to engage a planar surface.
Wings 14 and 15 extend outwardly from the diverging arms 8 and 9 respectively and have portions 16 and 17 engageable with respective side rails 4 and 5 of the ladder 3 and clamping members 18 and 19 secured to the wings 14 and 15 and the side rails 4 and 5 respectively for securing the safety device 1 on the upper end portion 2 of the ladder 3.
The illustrated body member 7 has a forward end 20 with the diverging arms 8 and 9 extending rearwardly therefrom. The diverging arms 8 and 9 are generally planar members preferably of flat metal strip and having upper and lower edges 21 and 22 respectively adapted to be positioned in respective planes substantially parallel with a supporting surface 23 for a lower end portion 24 of the ladder 3 whereby flat faces of the arms lie against the surface of an object against which the ladder is leaned. The diverging arms 8 and 9 are positioned to define and include an angle preferably less than about 60°.
It is desirable to protect the respective surfaces engaged by the body member 7 while supporting the upper end portion 2 of the ladder 3. It is also desirable to insulate the body member 7 particularly when formed of metal, from the respective surfaces, therefore, resilient material 25 is mounted on facing surfaces 26 and 27 of the diverging arms 8 and 9 and on surfaces 28 and 29 of the extensions 10 and 11 and on rearwardly facing surfaces 30 and 31 of the flanges 12 and 13. The resilient material 25 is engageable with respective surfaces to support the upper end portion 2 of the ladder 3 and provide a frictional engagement aiding in holding the ladder against movement.
The extensions 10 and 11 extend from the arms 8 and 9 respectively and at an angle therewith to position the extensions 10 and 11 in substantially perpendicular or normal planes. The resilient material 25 on the extensions 10 and 11 is positioned to engage intersecting surfaces which are substantially perpendicular, such as building corners and the like.
The flanges 12 and 13 extend outwardly from free ends of the extensions 10 and 11 respectively and at an angle therewith to position the flanges 12 and 13 substantially coplanar wherein the resilient material 25 thereon is positioned to engage a generally planar surface, such as building walls and the like.
The wings 14 and 15 are generally planar members each having one end suitably secured to the body 7 and extending outwardly therefrom. The wings 14 and 15 have the portions 16 and 17 respectively which are inclined relative to the plane of the upper edges 21 of the diverging arms 8 and 9 whereby the ladder 3 may be suitably inclined with the safety device being in a substantially horizontal plane thereby providing optimum engagement with a surface against which the ladder 3 is placed.
Suitable means are provided on each of the inclined portions 16 and 17 of the wings 14 and 15 for securing the respective side rails 4 and 5 of the ladder 3 thereto. The clamping members 18 and 19 are illustrated as U-bolts having suitable fasteners thereon, such as wing nuts 32 and 33 respectively. The inclined portions 16 and 17 of the wings 14 and 15 respectively have a plurality of spaced apertures 34 therein for the U-bolts 18 and 19 to extend therethrough.
In using a safety device for ladders constructed as illustrated and described, the clamping members or U-bolts 18 and 19 are secured to respective side rails 4 and 5 to position and secure the safety device 1 on the upper end portion 2 of the ladder 3. When the ladder 3 is to be supported relative to a generally rounded member, such as a wooden or metal pole, tree or the like, the safety device 1 is positioned with the generally rounded object between the diverging arms 8 and 9. The safety device 1 and the upper end portion 2 of the ladder 3 are then moved toward said rounded object. The diverging arms 8 and 9 extend rearwardly from the forward end 20 of the body member 7 with the diverging arms having sufficient resiliency to permit a generally rounded object to effect some spreading of the arms 8 and 9 to thereby substantially wedge same between the diverging arms 8 and 9 and the resilient material 25 thereon. The resilient material 25 is particularly effective to frictionally engage metal poles and the like and to electrically insulate the safety device 1 and the ladder 3 from the respective metal pole. When the safety device 1 is to support an upper end portion 2 of the ladder 3 relative to substantially normal intersecting surfaces, such as at a building corner, the body member 7 is moved toward the corner and the diverging arms 8 and 9 are spread whereby the intersecting surfaces are wedged between the extensions 10 and 11 with the resilient material 25 thereon cooperating with the wedging action and frictionally engaging the respective intersecting surfaces of the building corner. When the safety device 1 is to support an upper end portion 2 of the ladder 3 relative to a generally planar surface, the flanges 12 and 13 and the resilient material 25 thereon is moved into engagement with the respective planar surface with the resilient material 25 thereon is moved into engagement with the respective planar surface with the resilient material 25 protecting the finish or surface of the respective wall to prevent damage from engagement by the safety device 1.
It is to be understood that while I have illustrated and described one form of my invention it is not to be limited to the specific form or arrangement of parts herein described and shown.