U.S. patent application number 11/819526 was filed with the patent office on 2007-11-08 for guard rail safety system.
Invention is credited to Jonny Jonathon Melic.
Application Number | 20070257180 11/819526 |
Document ID | / |
Family ID | 35731101 |
Filed Date | 2007-11-08 |
United States Patent
Application |
20070257180 |
Kind Code |
A1 |
Melic; Jonny Jonathon |
November 8, 2007 |
Guard rail safety system
Abstract
A support post and safety fence assembly in which the post has a
telescoping inner and outer tube and is supported on a threaded
internal shaft coupled to a floor engaging end and ceiling engaging
end preferably formed with claws that have a number of sharp
penetrating points for firm engagement with a support surface. In
one embodiment, a gravity lock assembly is provided for fixing the
relative position of the inner and outer tubes. Dynamic
adjustability of the support post is provided by internal
compression springs.
Inventors: |
Melic; Jonny Jonathon;
(Ontario, CA) |
Correspondence
Address: |
GOWLING, LAFLEUR HENDERSON LLP
ONE MAIN STREET WEST
HAMILTON
ON
L8P 4Z5
CA
|
Family ID: |
35731101 |
Appl. No.: |
11/819526 |
Filed: |
June 28, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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10901141 |
Jul 29, 2004 |
7255312 |
|
|
11819526 |
Jun 28, 2007 |
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Current U.S.
Class: |
248/551 |
Current CPC
Class: |
E04G 2005/148 20130101;
E04G 21/3233 20130101 |
Class at
Publication: |
248/551 |
International
Class: |
E04G 21/32 20060101
E04G021/32 |
Claims
1. An extendable post installable between opposed surfaces, said
post having: a first longitudinally extending tube, a second
longitudinally extending tube in sliding telescoping engagement
with the first tube, a locking mechanism having an unlocked
condition permitting relative sliding movement of the first tube
relative to the second tube and a locked condition preventing
relative sliding movement of the first tube relative to the second
tube when the first tube and the second tube are in a desired
longitudinal relationship, one of the first and second tubes having
an end which in use is adjacent to one of said spaced surfaces,
said one tube having an internal guide bushing adjacent said end
and an internal nut spaced from the guide bushing and further from
said end than the guide bushing, and a shaft having a threaded
portion adjacent one end and a smooth portion adjacent an opposite
end, the threaded portion being engaged with the internal nut and
the smooth portion extending through the guide bushing in sliding
engagement therewith, said smooth portion projecting from said end
of said one tube, said opposite end of the shaft carrying a surface
engaging member.
2. An extendable post according to claim 1 wherein the surface
engaging member is carried by the shaft in such as manner as to be
capable of angular movement relative thereto.
Description
RELATED APPLICATION
[0001] This application is a continuation of U.S. patent
application Ser. No. 10/901,141 filed Jul. 29, 2004.
FIELD OF INVENTION
[0002] This invention relates to a safety post and fence assembly
for use at a construction site.
BACKGROUND OF THE INVENTION
[0003] Safety barriers or fences are used during the construction
of high rise buildings to prevent construction workers from falling
from the building and injuring themselves. They are also useful to
prevent materials from falling from the building and for catching
any flying debris being blown against the barriers and injuring
people below. The safety barriers need to be set up and taken down
with relative ease since they are temporary and frequently moved
from one location to another as the construction progresses. A
safety barrier of this type typically comprises a plurality of
posts supporting intervening fence panels.
[0004] Various types of support posts and fencing assemblies have
been designed to try and address this need for a safety barrier.
U.S. Pat. No. 3,822,850 discloses a support for a construction
fence. The support comprises a telescoping jack post which can be
adjusted to fit snuggly between a floor and ceiling. U.S. Pat. No.
3,589,682 discloses another type of telescopic fence column which
has a manually operable jacking system and upper and lower pads for
contacting the ceiling and floor of a portion of the building. U.S.
Pat. No. 3,946,992 discloses another type of construction fence
post which comprises a C-shaped bracket which is used to clamp the
post to the edge of the floor section. U.S. Pat. No. 3,734,467
describes an upright for a wall partition which has a compression
spring that allows for frictional engagement of the upright between
floors of a building under construction. U.S. Pat. No. 6,679,482
discloses an improved construction perimeter guide stanchion. An
adjustment system allows one to tightly clamp the pair of jaws at
the lower end of the stanchion to the edge of a floor slab in an
elevated unfinished building.
[0005] Although many attempts have been made to design improved
safety barrier systems, there remains a need for a system that is
easily erected and dismantled and which is self-adjusting, easily
packaged safer and tamper-proof.
SUMMARY OF THE INVENTION
[0006] A support post and safety fence assembly in which the post
has a telescoping inner and outer tube and is supported on a
threaded internal shaft coupled to a floor engaging end and ceiling
engaging end preferably formed with claws that have a number of
sharp penetrating points for firm engagement with a support
surface. In one embodiment, a gravity lock assembly is provided for
fixing the relative position of the inner tube and outer tube.
Dynamic adjustability of the support post is provided by internal
compression springs which also allow the port to be temporarily
positioned in an upright position prior to securement.
BRIEF DESCRIPTION OF DRAWINGS
[0007] FIG. 1 is a side elevation view of a safety post and fence
assembly positioned between two floors of a building under
construction;
[0008] FIG. 2a is an assembly view of a post made in accordance
with the invention;
[0009] FIG. 2b is a cross-sectional view showing a top end of the
post of FIG. 2a in a compressed configuration;
[0010] FIG. 2c is a cross-sectional view of a center portion of the
post of FIG. 2a with a lock positioned in engagement with an outer
tube;
[0011] FIG. 2d is a perspective view showing the top end of the
post of FIG. 2a;
[0012] FIG. 2e is a perspective view showing a bottom end of the
post of FIG. 2a;
[0013] FIG. 3a is a side elevation view of the post;
[0014] FIG. 3b is a cross-sectional view drawn on line 3b-3b of
FIG. 3a;
[0015] FIG. 4 is a similar view to FIG. 3a showing the post in
position between floors of the building under construction;
[0016] FIG. 5 is a similar view to FIG. 4 from another side;
[0017] FIG. 6 is a side elevation view showing the post of FIG. 4
being lowered to a lock position;
[0018] FIG. 7 is a detail cross-sectional view of circled area 7 in
FIG. 6;
[0019] FIG. 8 is a side elevation view showing the post of FIG. 6
being returned to a vertical orientation;
[0020] FIG. 9 is a detailed cross-sectional view of the top end of
the post;
[0021] FIG. 10 is a perspective view of a portion of a fence panel
and associated fence lock;
[0022] FIG. 11 is a similar view to FIG. 10 showing the fence lock
in an operative locking orientation;
[0023] FIG. 12 is a similar view to FIG. 11 showing the fence lock
in engagement to capture a fence post;
[0024] FIG. 13 is a top plan view of a pair of fence panels
associated with a pair of support posts; and
[0025] FIG. 14 is a cross-sectional view of an alternative
embodiment of a support post made in accordance with the
invention.
DESCRIPTION OF PREPERRED EMBODIMENTS WITH REFERENCE TO DRAWINGS
[0026] The invention provides a safety fence assembly generally
indicated by reference numeral 20 and consisting of a plurality of
upright support posts 22 that extend between a supporting surface
or floor 24 and a ceiling 26. The posts are normally positioned
adjacent to an opening and spaced apart by a distance commensurate
with the length of an associated fence panel or barrier 28. The
fence panel 28 is normally positioned on the interior side of the
associated support post 22 and thus in the view of FIG. 1, the
observer would be looking out of a building, the floor 24 and
ceiling 26 having been drawn in cross-section. As will be
appreciated by those skilled in the art, the safety fence assembly
20 may be used in a number of circumstances according to the needs
at the building site.
[0027] The construction of the support post 22 is shown in more
detail in FIGS. 2a through 2e. An overall view of the support post
22 is provided in FIG. 3a where it will be observed that the
support post has a floor engaging end or foot 30 at one end and a
similar ceiling engaging end 32 at the opposite end with a pair of
telescoping inner and outer tubes 34, 36 in between. As will be
seen from FIG. 3b, the cross-section of the inner and outer tubes
is square so that rotation of the outer tube 36 will also turn the
inner tube 34, as is explained further below. The coupling of the
floor engaging end 30 and ceiling engaging end 32 to the support
post 22 will be explained in more details with reference to FIGS.
2a to 2e.
[0028] As will be observed in the detail view of FIG. 2e, the foot
34 has a cruciform shape with four claws 38 each having a pair of
sharp penetrating points for firm engagement with a supporting
surface. It will be observed that the points are spaced apart and
each has a length that is selected to limit penetration into a
supporting surface. This configuration allows safety post 22 to
come into firm engagement with the associated floor 24 and to
penetrate any surface frost or dust which might otherwise interfere
with safe operation of the post. By limiting penetration of the
claw into an associated surface, damage to the surface is
avoided.
[0029] As will observed from FIG. 2d, the ceiling engaging end 32
has a similar cruciform configuration with four claws 40 of similar
shape. However, it will be observed that the separation between
opposing pairs of claws 40 in the ceiling engaging end 32 is
smaller than the separation between pairs of claws 38 in the floor
engaging end 30. Thus, the floor engaging end 30 has a bigger
"footprint" than the ceiling engaging end 32 for increased
stability at the operatively lower end of the support post 22 where
it needs to support any fence panels 28. Conveniently, the floor
engaging end 30 and ceiling engaging end 32 can be nested thereby
saving space during shipping.
[0030] The floor engaging end 30 is rotatably coupled to a reduced
diameter portion of a shaft 42 which extends upwardly in the
operative orientation of the support post 22. The shaft 42 is a
solid steel bar that has a free end 44 that is threaded along its
length and concealed from view inside the outer tube 36. The outer
tube 36 has an internal nut 46 welded to its interior surface
adjacent a lower end thereof and having complementary threads to
the threaded end 44 of the shaft 42. The lower extremity of the
outer tube 36 has a guide bushing 48 for sliding engagement with
the shaft 42 and which closes the lower end of the outer tube 36 to
prevent the ingress of dirt into the assembly. A plate 50 is welded
to the interior surface of the outer tube 36 above the height of
the threaded end 44 of the shaft 42 to prevent any dirt from
falling into the assembly from the top of the support post 22.
[0031] The ceiling engaging end 32 is rotatably coupled to a stem
52 which is slidingly received in the operatively upper end of the
inner tube 34. The stem 52 carries a longitudinally extending pin
54 which has a head that locates against a collar 56 welded to the
interior surface of the inner tube 34. A top compression spring 58
is captured between the supporting collar 56 and the stem 52. Thus,
the application of pressure to the ceiling engaging end 32 will
cause the stem 52 to penetrate into the inner tube 34 and compress
the compression spring 58 as illustrated by FIG. 2b. The lower end
of inner tube 34 supports a gravity lock assembly generally
indicated by reference numeral 60 which is used to fix the relative
position of the telescoping inner and outer tubes 34, 36. A
supporting collar 62 is welded to an interior surface of the inner
tube 34 a short distance from the operatively lower end of the
inner tube. The supporting collar supports a longitudinally
extending pendulum stem 64 with associated flange 66 that, in use,
extends downwardly to the lower extremity of the inner tube 34. At
the lower end, the pendulum stem 64 is fitted into an enlarged
portion which pivotally supports a pendulum lock 68. The pendulum
lock 68 extends longitudinally a short distance below the pendulum
stem 64 and has two oppositely disposed fins 70 that extend
outwardly and are adapted to engage into a selected one of a series
of longitudinally spaced apertures 72 formed in the outer tube 36.
The apertures 72 are disposed in pairs formed on opposite sides of
the outer tube 36. The number and spacing of the apertures 72 can
be varied according to the degree of adjustability required in
fixing the relative position of the inner and outer tubes 34, 36.
It will also become apparent that the apertures 72 can be staggered
and do not need to be provided in oppositely disposed pairs. The
lower extremity of the pendulum lock 68 has a longitudinally
extending tongue 74 for added weight and also to provide a bearing
surface for accessing the pendulum lock 68 if it needs to be
dislodged.
[0032] A center compressing spring 76 is captured at a lower end of
the inner tube 34 between a locating collar 78 adjacent to the
pendulum lock 68 and the supporting collar 62 which is fixed to the
inner tube 34. A stop 80 is fixed to the interior of the inner tube
34 to limit the upward travel of the pendulum stem 64 and flange
66.
[0033] The outer tube 36 also has a stop shown in FIG. 2a in the
form of a washer 82 welded into its interior surface. The stop
limits the downward travel of the inner tube 34 relative to the
outer tube 36. It will be understood that the central aperture of
the washer 82 is provided to accommodate the length of the tongue
74 from the gravity lock assembly 60.
[0034] The operation and installation of the support post 22 will
now be described with reference being made to FIGS. 4 to 9. FIGS. 4
and 5 show the inner and outer telescoping tubes 34, 36 extended
from each other so that the separation between the floor engaging
end 30 and ceiling engaging end 32 approximate the height of the
ceiling 26 from the floor 24. Once the approximate separation of
the inner and outer tubes 34, 36 has been determined, the support
post 22 is inclined as indicated by arrow 84 in FIG. 6. Inclining
the support post 22 causes the pendulum lock 68 to pivot and for
one of the fins 70 to come into engagement with the internal
surface of the outer tube 36. The separation between the inner and
outer tubes 34, 36 is then adjusted so that the fin 70 of the
pendulum lock 68 is brought into engagement with the adjacent upper
aperture indicated by reference numeral 72a in FIG. 7. Selecting
upper aperture 72a fixes the relative position of inner and outer
tubes 34, 36 so that the combined length of the support post 22
would exceed the separation between the ceiling 26 and the floor
24. Returning the support post 22 to bring the ceiling engaging end
32 into engagement with the ceiling 26 as indicated by arrow 86 in
FIG. 8, causes the softer center compression spring 76 to compress
against the locating collar 78 as a downward load is applied to the
inner tube 34 as indicated by arrow 88 in FIG. 2c. Thus the center
compression spring 76 operates to maintain the relative position
between the inner and outer tubes 34, 36 while in the upright
position prior to securement of the post.
[0035] To secure placement of the support post 22, the outer tube
36 together with the inner tube 34 are rotated on the threaded
shaft 42 as indicated by arrow 90 in FIG. 8. The thread of the
threaded end 44 and the nut 46 are formed so that a
counterclockwise rotation will bring about an upward vertical
movement of the inner and outer tube assembly 34, 36. As pressure
is applied to the ceiling engaging end 32, the inner tube 34 moves
upwardly relative to the stem 52 thereby obscuring the stem from
view. Conveniently the stem 52 may have a bright color applied to
it such as a red colored band to provide a visual indication of the
load being applied to the top compression spring 58 as observed in
FIG. 2b. The inner tube 34 completely obscures the stem 52 when the
compression spring 58 is fully loaded. It will be appreciated that
the top compression spring 58 provides a means to respond in
dynamic fashion to any small dimensional changes due to expansion
or contraction of the floor and ceiling.
[0036] Once positioned, the support post 22 is extremely stable and
secure so that it can successfully withstand pull or push tension
tests applied to its mid portion thereby complying with regulations
of the applicable health and safety legislation or other
legislation. Compliance with the safety regulations is largely
attributed to the greater stability and improved surface contact
provided by the configuration of the floor engaging end 30 and the
ceiling engaging end 32. An added advantage of the post 22 made in
accordance with the invention is that the component parts are all
hidden in the interior of the telescoping inner and outer tubes 34,
36 and therefore are inaccessible to any accidental tampering which
would compromise the safety of the post. Conveniently, there are no
auxiliary tools required for proper position of the post and
therefore the post is always ready for placement without having to
seek and obtain the required tools. In addition, the square
configuration of the inner and outer tubes, in combination with the
counter clockwise thread, allows the tubes to be manually adjusted
without requiring the assistance of a torque wrench, although this
may used, if required. Because of the square cross-section,
gripping of the hands or the need for an auxiliary tool such as a
torque wrench is minimized.
[0037] In use, the support post 22 is erected at selected locations
and a plurality are positioned at suitable distances required to
support fence panels positioned in overlapping fashion as shown in
FIGS. 1 and 13 in order to form a security barrier. As shown in
FIG. 1, the fence panel 28 has a generally rectangular frame which
includes a pair of spaced oppositely disposed upright members 92.
These are coupled to a upper horizontal member 94 and an
operatively lower horizontal member 96. Conveniently, the lower
horizontal member has a kick guard 98 attached to it and extending
the length of the fence panel 28. A plurality of spaced horizontal
and vertical wires 100 form a grid and are attached at opposite
ends to the rectangular frame formed by the upright members 92 and
horizontal members 94, 96. A horizontal reinforcement member is
fixed to the upper horizontal member 94. A fence lock 104 is shown
in more detail in FIGS. 10 to 12 and consists of a bolt 106 which
is fixed to the upright 92 and has its threaded end extending
through the upright 92 in a plane which is parallel to that of the
rectangular frame of the fence panel 28. The inner end of the bolt
106 is secured to the upright 92 by welding. An L-shaped handle 108
is rotatably mounted to the bolt 106 and has its free end extending
parallel to the bolt so that it can be rotated from the plane of
the fence panel 28 outwardly as indicated by arrow 110 to a
parallel plane spaced from the fence panel 28. The handle 108 is
captured between a washer 112 and a spring washer 114 to which
pressure is applied with a nut 116. In the shipping position of the
fence lock 104, the handle 108 is brought to rest against a tab 118
that stops the handle 108 from further rotation out of the plane of
fence panel. Once rotated into the position shown in FIG. 11, the
fence panel 28 is slid in the direction indicated by arrow 120 to
move the fence panel towards the support post 22 and capture the
post between the handle 108 and the fence panel wires 100.
[0038] It will be noted that the handle 108 is sufficiently long to
accommodate the fence post 22 as well as the width of a second
fence panel 28 positioned between the post 22 and the fence panel
as drawn to the right of FIG. 13. It will be appreciated that the
fence panel 28 is thereby securely captured and will not easily
become dislodged thereby improving the safety of the safety fence
assembly which simplifies erection as a whole. In addition, the
extent of the overlap between adjoining fence panels may be
adjusted making it more or less difficult to release of an
individual panel from the assembly for repositioning elsewhere or
dismantling of the fence assembly.
[0039] The combination of the support post according to the
invention and the fence panel with a rotatably mounted fence lock
provides numerous advantages over the prior art, in particular with
respect to security and safety of workers and their co-workers. It
also makes the product easier to use and more practical.
[0040] An alternative embodiment of the support post according to
the invention will now be described with reference to FIG. 14.
[0041] The support post 130 in FIG. 14 has a floor engaging end 132
which is similar to the floor engaging end 30 of support post 22
and therefore will not be described in any more detail. However, it
has a ceiling engaging end 134 that has an outer surface covering
136 made of compressible material such as rubber or synthetic
equivalents that are mechanically equivalent to providing the
compressive load applied in the support post 22 to the top
compression spring 58. The support post 130 has an inner tube 138
of circular cross-section which is telescopically received in an
outer tube 140 which likewise has a circular cross-section. At the
lower extremity of outer tube 140 a threaded collar 142 is attached
to its internal surface for threaded engagement with a threaded
post 144 having a bottom end which is rotatably coupled to the
floor engaging end 132 and an upper free end which extends into the
interior of the outer tube 140. A stop flange 146 is fixed to the
upper threaded end of the post 144 to limit the relative position
of the outer tube 140 to the threaded post 144.
[0042] The outer tube 140 has a series of longitudinally spaced
apertures 148 formed in pairs on opposite sides of the outer tube.
A lug 150 is rotatably coupled to an operatively lower end of the
inner tube 138 through a bushing 152 fixed to the inner tube 138.
The lug 150 has a pin receiving hole 154 which is adapted to align
with a selected pair of the apertures 148 in the outer tube 140 in
order to receive a locking pin (not shown) which traverses the
outer tube 140 and the lug 150 to fix the relative position of the
telescoping inner and outer tubes 138, 140.
[0043] In use, the telescoping inner and outer tubes 138, 140 are
separated to approximate the height separating the ceiling from the
associated supporting surface or floor and the locking pin is
inserted as described above. Final adjustments of the height of the
support post 130 is achieved by rotating the outer tube 140 on the
threaded post 144 so as to extend the height of the support post.
By virtue of the bushing 152, the ceiling engaging end 134 remains
fixed against the upper engagement surface while the surface
covering 136 is compressed. As in the case of the support post 22,
the post is adapted to adjust dynamically to any dimensional
changes as may occur due to settling, weather conditions, drying of
the cement, etc. The dynamic adjustability at the ceiling engaging
end eliminates the need to constantly check and adjust post height
in order to ensure safety.
[0044] As will be appreciated by those skilled in the art, several
other variations may be made to above-described embodiments of the
invention within the scope of the appended claims.
* * * * *