U.S. patent number 3,715,012 [Application Number 05/184,054] was granted by the patent office on 1973-02-06 for safety ladder brace.
Invention is credited to Adelbert W. Perry.
United States Patent |
3,715,012 |
Perry |
February 6, 1973 |
SAFETY LADDER BRACE
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.
Inventors: |
Perry; Adelbert W. (Grandview,
MO) |
Family
ID: |
22675391 |
Appl.
No.: |
05/184,054 |
Filed: |
September 27, 1971 |
Current U.S.
Class: |
182/107;
182/214 |
Current CPC
Class: |
E06C
7/48 (20130101); E06C 7/482 (20130101) |
Current International
Class: |
E06C
7/00 (20060101); E06C 7/48 (20060101); E06c
007/48 () |
Field of
Search: |
;182/214,107,108 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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:
a. a body member having a pair of diverging arms;
b. a wing extending outwardly from each of said arms and having a
portion engageable by a respective side rail of a ladder;
c. means on each of said wings for securing said respective side
rail of the ladder thereto;
d. an extension for each of said pair of diverging arms, said
extensions extending from said respective arms at an angle to
position said extensions in substantially normal planes.
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:
a. a body member having a pair of diverging arms forming a
generally V-shape having substantially coplanar upper edges;
b. a wing extending outwardly from each of said arms and having a
portion engageable by a respective side rail of a ladder said rail
engaging portions of said wings being positioned in a plane
inclined relative to the plane of the upper edges of said arms;
c. an extension for each of said pair of diverging arms, said
extensions extending from said respective arms at an angle to
position said extensions in substantially normal planes;
d. a flange extending outwardly from a free end of each of said
extensions, said flanges being substantially coplanar; and
e. means on each of said wings for securing said respective rails
of the ladder thereto.
5. A safety device for ladders as set forth in claim 4
including:
a. resilient material mounted on facing surfaces of said arms and
engageable with the surface to support an upper end portion of the
ladder;
b. resilient material mounted on said extensions of said arms and
engageable with respective surfaces in substantially normal planes
to support an upper end portion of the ladder; and
c. resilient material mounted on said flanges and engageable with a
substantially planar surface to support an upper end portion of the
ladder.
6. A safety device for ladders as set forth in claim 5 wherein:
a. said arms of said body member have respective upper edges
adapted to be positioned in a plane substantially parallel with a
surface supporting a lower end portion of the ladder;
b. said wings each have a portion inclined relative to the plane of
said upper edges whereby the ladder may be inclined with the safety
device being in a substantially horizontal plane;
c. said diverging arms of said body member are planar members;
and
d. said diverging arms are positioned to define an included angle
therebetween of less than 60.degree. .
7. A safety device for ladders having a pair of spaced side rails,
said safety device comprising:
a. a body member having a pair of diverging arms;
b. a wing extending outwardly from each of said arms and having a
portion engageable by a respective side rail of a ladder;
c. means on each of said wings for securing said respective side
rail of the ladder thereto;
d. said diverging arms of said body member being planar
members;
e. said diverging arms being positioned to define an included angle
therebetween of less than about 60.degree.;
f. said diverging arms having sufficient resiliency to permit a
generally rounded object to effect separation of said arms when a
ladder having the body member thereon is moved toward and into
engagement with a generally rounded object to thereby substantially
wedge same between the diverging arms.
8. A safety device for ladders as set forth in claim 1 and
including:
a. said diverging arms having flat inner faces;
b. resilient material fixed to said diverging arm interfaces and
positioned for engagement with said generally rounded objects
wedged between the diverging arms.
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.degree..
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.
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