U.S. patent number 3,867,997 [Application Number 05/427,833] was granted by the patent office on 1975-02-25 for guard rail support for scaffold.
Invention is credited to Thomas Hyslop, Jr..
United States Patent |
3,867,997 |
Hyslop, Jr. |
February 25, 1975 |
GUARD RAIL SUPPORT FOR SCAFFOLD
Abstract
A guard rail support for scaffolds comprises an upright post
having a bracket at one end thereof pivotably mounting an elongated
crossbar. The crossbar includes a second bracket. The two brackets
include rigid protruding lips that face one another and serve to
engage a scaffolding platform in an operative position along
upwardly facing surfaces adjacent opposed side walls. The crossbar,
when the lips are thus engaged, extends across the platform against
a downwardly facing surface thereof. The post and crossbar may be
selectively locked in this position to secure the support to the
platform. The support also includes fixed and movable brackets for
receiving and securing guard rails thereon.
Inventors: |
Hyslop, Jr.; Thomas (Spokane,
WA) |
Family
ID: |
23696480 |
Appl.
No.: |
05/427,833 |
Filed: |
December 26, 1973 |
Current U.S.
Class: |
182/113;
256/65.14; 256/65.05 |
Current CPC
Class: |
E04G
21/3233 (20130101); E04G 5/14 (20130101); E04G
2007/285 (20130101) |
Current International
Class: |
E04G
5/14 (20060101); E04G 21/32 (20060101); E04h
017/14 (); E04g 001/16 () |
Field of
Search: |
;182/113,82,138 ;248/228
;256/65 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Machado; Reinaldo P.
Attorney, Agent or Firm: Wells, St. John & Roberts
Claims
What I claim is:
1. A removable guard rail support for an elongated scaffolding
platform having horizontal first and second upwardly facing surface
areas adjacent transversely opposed sides and a downwardly facing
area spaced elevationally below said first and second upwardly
facing surfaces, said guard rail support comprising:
an upright post;
first bracket means fixed to one end of the post for engaging said
platform along a portion of the first upwardly facing surface
area;
a crossbar having one end thereof mounted to the first bracket
means for pivotal movement about a pivot axis to an operative
position wherein said crossbar engages the downwardly facing
surface;
second bracket means provided at the remaining end of the crossbar
for engaging said platform along a portion of the second upwardly
facing surface area with said crossbar in said operative
position;
locking means interconnecting the first bracket and the crossbar
for selectively locking the crossbar in the operative position
against relative angular movement about the pivot axis; and
guard rail mounting means on said upright post for releasably
receiving and supporting a horizontal guard rail.
2. The invention set out in claim 1 wherein said first bracket
means includes a horizontal protruding lip fixed to the upright
post and elevationally spaced from the crossbar when in said
operative position, by a distance substantially equal to the
distance between the first upwardly facing surface area and the
downwardly facing surface area; and
wherein said second bracket means includes a horizontal protruding
lip fixed to said second bracket means and spaced from the crossbar
a distance substantially equal to the distance between the second
upwardly facing surface area and the downwardly facing surface
area.
3. The invention set out in claim 2 further comprising adjusting
means for enabling the second bracket means to be selectively
positioned along the length of the crossbar.
4. The invention set out in claim 1 wherein the locking means
comprises:
complementary apertures formed through said first bracket means and
said crossbar at equal radial distances from the pivot axis, said
complementary apertures being positioned so that they align with
one another in the operative position of the crossbar; and
a rigid locking member slidably receivable through the aligned
complementary apertures.
5. The invention set out in claim 1 wherein the guard rail mounting
means comprises:
a guard rail support bracket slidably receiving a guard rail, said
first support bracket being mounted to the upright post for
movement along the post;
fastening means connected to the post for urging the guard rail
against the first guard rail support bracket; and
a guard rail support channel mounted to the other end of the
upright post for receiving a second guard rail therethrough.
Description
BACKGROUND OF THE INVENTION
The present invention relates broadly to the field of safety
equipment for scaffolding utilized in the construction industry
and, more particularly, to such equipment utilized to support guard
rails on suspended platforms for scaffolding.
Many industrial and government safety codes specifically require
the use of a guard rail on suspended platforms, including single
portable scaffolding planks. While it is relatively simple to
construct a guard rail and support system for a large suspended
platform, the construction and attachment of guard rails to
portable planks or platforms is a rather difficult procedure and
often results in unsafely constructed guard rails and supports. It
is also desirable to utilize removable guard rails and supports for
such portable platforms to enable their disassembly for
transportation and reuse.
The difficulty experienced in currently available guard rail
supports is their usual bulk and complex nature. The relative
complexity of these supports not only makes them expensive to
purchase, but also potentially dangerous to use.
U.S. Pat. Nos. 3,084,759 and 1,934,000 granted to R. K. Squire and
B. J. Piccirilli respectively both disclose a removable guard rail
stanchion comprising an upright guard rail support post having
clamps at a lower end thereof. The clamps allow the posts to be
secured to the walking surface of a platform.
Another U.S. Pat. No. 2,706,662 granted to D. N. Brown discloses a
detachable staging stanchion for suspended platforms in which an
upright guard rail support is held against the walking surface of a
platform by a supporting clamp assembly extending part way across
the bottom of the platform.
The apparatus of the present invention includes an upright post,
held outward of the walking surface of a supporting scaffold. It
utilizes an easily adaptable mounting bracket assembly extending
over the scaffold to fix the post to the scaffold and allow a
maximum amount of usable surface area along the walkway.
SUMMARY OF THE INVENTION
A removable guard rail support for an elongated scaffolding
platform is disclosed herein comprising an upright post with a
first bracket means fixed to one end thereof. The first bracket
means pivotably mounts a crossbar for pivotal movement about a
pivot axis. The crossbar includes a second bracket means and is
freely pivotable about the axis to an operative position wherein
the crossbar engages a downwardly facing surface of the scaffolding
platform. The first bracket means is utilized to engage the
platform along a first upwardly facing surface area and the second
bracket means is utilized to engage the platform along a second
upwardly facing surface area with the crossbar in an operative
position. Locking means is provided between the crossbar and first
bracket means to enable selective locking of the crossbar to the
first bracket to prevent pivotal movement of the crossbar about the
pivot axis. Guard rail mounting means is provided on the upright
post for releasably receiving and supporting horizontal guard
rails.
It is a first object of my invention to provide a removable guard
rail support for scaffolds that enables maximum utilization of the
walking surface area of the supporting scaffold.
It is a further object of my invention to provide such a guard rail
support that is simple in construction and thereby inexpensive to
manufacture and easy to use.
An additional object is to provide such a guard rail support that
is of sturdy construction and provides maximum safety to the
user.
It is a yet further object of my invention to provide such a guard
rail support that is easily adjustable to fit scaffolding platforms
of varying sizes and configurations.
These and other objects and advantages will become evident upon
reading the following disclosure which, taken with the accompanying
drawings, describe a preferred form of my invention.
A BRIEF DESCRIPTION OF THE DRAWINGS
A preferred form of the present invention is illustrated in the
accompanying drawings in which:
FIG. 1 is an elevational view showing the guard rail support
mounted to a scaffolding plank;
FIG. 2 is a cross-section view taken along line 2--2 in FIG. 1;
FIG. 3 is an enlarged fragmentary section view taken along line
3--3 in FIG. 2; and
FIG. 4 is an enlarged fragmentary view illustrating details of a
portion of the guard rail support.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The guard rail support of the present invention is illustrated in
FIGS. 1 and 2 mounted to a scaffolding platform generally
designated by the reference numeral 10. Platform 10 is of
conventional construction embodying a transversely spaced pair of
upright sidewalls 12, a lower surface 13 and an upper horizontal
surface 11. The upper surface 11 is utilized as a walkway 15 to
enable a user or users to move freely along the platform while it
is suspended above the ground.
The guard rails are designated by the numeral 14 and are removably
supported by the apparatus of the present invention. Such guard
rails 14 are normally utilized as safety precautions to prevent
persons or equipment from accidentally falling from a scaffold
platform 10 that is normally narrow in configuration.
Looking now in greater detail to FIG. 2, the guard rail support
comprises an upright post 17 having a first bracket 18 rigidly
fixed to the lower end thereof. The bracket 18 pivotably carries a
crossbar 20 by means of a pivot bolt 21. The crossbar 20 is
pivotable about the axis of the pivot bolt 21 to an operative
position wherein a protruding lip 23 of the bracket 18 and the
upper surface 25 on crossbar 20 are substantially parallel as shown
in FIG. 2.
The crossbar includes a second bracket 22 mounted at the other end
thereof. The second bracket 22 also includes a protruding lip 24
that extends from the second bracket 22 toward the first bracket
18. The lip 24 is spaced from the upper surface 25 of crossbar 20 a
distance substantially equal to the thickness of the downwardly
facing support surface 13.
The crossbar 20 may be selectively locked in the operative position
described above by aligning a pair of apertures 28 formed through
the first bracket 18 and a complementary aperture 29 formed through
the crossbar 20. A locking member comprising a bolt and wing nut
assembly 32 may be secured through the aligned apertures 28 and 29
to securely lock the crossbar 20 to the bracket 18 to prevent
pivotal movement of the crossbar 20 about the pivot axis of the
pivot bolt 21.
The guard rail support may be mounted to the scaffold platform 10
simply by positioning the second bracket over the surface 13
adjacent one side wall 12 so that a portion of the surface is
included between the lip 24 and the top surface 25 of crossbar 20.
The remainder of the support is then pivoted about the axis of
pivot bolt 21 to bring the crossbar to the operative position with
the lip 23 covering a portion of the support surface 13 adjacent
the remaining side wall 12. The bolt may then be inserted through
the aligned apertures 28 and 29 and the wing nut secured to the end
of the bolt. In this position, the lips 22 and 23 rest on upwardly
facing surfaces of the support surface 13 and the crossbar 20
extends across the downwardly facing surface. The guard rail
support is thereby securely attached to the platform with none of
the supporting structure being exposed on the walkway 15.
Adjusting means is provided to enable the guard rail support to be
mounted to scaffolding platforms of different widths. The adjusting
means is comprised of a number of apertures 35 formed through the
crossbar 20 adjacent the end supporting the second bracket 22. The
bracket 22 is mounted to the crossbar 20 by a spaced pair of bolts
34. By removing the bolts 34 and sliding the bracket 22 along the
crossbar 20 until a different set of apertures 35 is aligned with
the holes (not shown) formed through bracket 22 for receiving bolts
34. Bolts 34 are then inserted through apertures 35 to secure
second bracket 22 in a different position along crossbar 20.
Upright post 17 includes means for mounting guard rails which
comprises a first support bracket 37 slidably mounted on upright
post 17 adjacent first bracket 18. First support bracket 37 is
C-shaped in configuration, with its ends mounted to semi-circular
clips 40. Clips 40 are complimentary to the cross sectional
periphery of post 17 to allow bracket 37 to be freely moved up and
down post 17. The adjustability of first bracket 37 is an important
feature of this invention in that it enables the guard rail support
to be mounted to platforms of varying thickness. It also enables
the lowermost guard rail 14a to be elevationally positioned with
respect to walkway 15. The lowermost guard rail or "toe board" 14a
is provided to prevent tools from inadvertantly being kicked off
the platform 10 and as a safety measure to further aid in
preventing a worker from falling from the platform. Guard rails or
toe boards 14a are received within a passageway defined by the
bracket 37 and a portion of upright post 17 as seen in FIG. 2. The
rails 14a are selectively secured to the bracket 37 by fastening
means comprising a clamp screw 41 that threadably extends through
post 17 toward the bracket 37. Once guard rail 14a has been
inserted through bracket 37 and clamp screw 41 is tightened,
bracket 37 will no longer freely slide along post 17.
To further facilitate adjustment of first bracket 37 along the
length of upright post 17, two threaded clamp screw receiving
apertures 42 are provided through post 17. Apertures 42 enable
clamp screw 41 to be selectively moved between two positions along
upright post 17 to further enable positioning of bracket 37
thereon.
A second bracket 38 is provided approximately midway along upright
post 17. A second clamp screw 43 is provided to securely clamp
guard rails within bracket 38 which is rigidly fixed to the post
17.
The upward end of upright post 17 includes a guard rail support
channel 45 that is rigidly fixed thereto for receiving an upper
guard rail therethrough.
As shown in FIG. 1, several guard rail support assemblies can be
utilized to support a continued progression of several elongated
support rails along an elongated scaffold platform 10. When several
guard rails are to be utilized end to end to span a substantially
long distance, the ends may be arranged as shown in FIGS. 1 and 2
in overlapping engagement within the second support bracket 38. In
this manner both guard rails are securely held together and to the
scaffold platform 10.
It may become evident from the above description and the attached
drawings that various changes and modifications may be made therein
without departing from the scope of this invention. It is therefore
intended that only the following claims be taken as definitions of
this invention.
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