Patent application title: Apparatus for Forming Temporary Guardrails on Stairs
Miguel Osvaldo Gutierrez (Atlanta, GA, US)
Safety Maker, Inc.
IPC8 Class: AE04H1714FI
Class name: Rail connection clamp
Publication date: 2011-11-10
Patent application number: 20110272659
An apparatus for use in erecting a temporary guardrail on a stair, having
a stair stringer. The apparatus has an elongated stanchion. A first jaw
assembly is operatively attached to the stanchion for engaging one side
of the stringer, proximal the bottom edge thereof, and includes a first
compression assembly to operatively urge the stanchion against the
stringer. A second axially spaced, jaw assembly is operatively attached
to the stanchion for engaging the one side of the stringer proximal a top
edge thereof, and includes a second compression assembly to urge the
stanchion against the stringer, and a bracket attached to the stanchion,
and being adapted to receive a temporary guardrail member.
1. An apparatus for use in erecting a temporary guardrail on a stair
having a stair stringer having a first and a second side comprising: an
elongated stanchion having a front side and a back side; a first jaw
assembly operatively attached to said stanchion, said first jaw assembly
including a first, head portion adapted to engage a first side of said
stair stringer proximal a bottom edge thereof; and a first compression
assembly attached to said first head portion and operative to urge said
stanchion against the front side of said stringer; a second, axially
spaced jaw assembly, operatively attached to said stringer, said second
jaw including a second head portion, adapted to engage said first side of
said stringer distal said bottom edge; and a second compression assembly
attached to said second head portion and operative to urge said stanchion
against the front side of said stringer; and at least one bracket
operatively attached to said stringer and axially spaced from said second
jaw, said bracket being adapted to receive a temporary rail member.
2. The apparatus of claim 1, wherein said first head portion is L-shaped and includes a first flange portion for engaging said first side of said stringer, and a first leg portion attached to said first flange portion, and said first compression assembly includes a first shank portion extending from said first leg portion and a first tightener operatively connected to said first shank portion to urge said first shank portion in a direction away from said first flange portion to thereby compressively urge said first flange portion into engagement with the first side of said stringer.
3. The apparatus of claim 1, wherein said second head portion is L-shaped and includes a second flange portion for engaging said first side of said stringer, and a second leg portion attached to said first flange portion, and said second compression assembly includes a second shank portion extending from said second leg portion and a second tightener operatively connected to said second shank portion to urge said second shank portion in a direction away from said second flange portion to thereby compressively urge said second flange portion into engagement with the first side of said stringer.
4. The apparatus of claim 1, wherein said second jaw assembly is longitudinally adjustable along said stanchion.
5. The apparatus of claim 2, wherein said first shank portion spans said front and back sides of said stringer.
6. The apparatus of claim 3, wherein said second shank portion spans said front and back sides of said stanchion.
7. The apparatus of claim 5, wherein there are registering bores in said front and back sides of said stanchion and said first shank portion extends through said registering bores.
8. The apparatus of claim 6, wherein there are registering bores in said front and back sides of said stanchion and said second shank portion extends through said registering bores.
9. The apparatus of claim 8, wherein there are plurality of said registering bores.
10. The apparatus of claim 1, wherein there are at least two of said brackets axially spaced from said second jaw assembly.
11. The apparatus of claim 1, wherein there is a fastener securing said at least one rail member to said stanchion.
12. The apparatus of claim 1, wherein said at least one rail member comprises a 2.times.4.
13. The apparatus of any one of claims 1 and 2, wherein said tightener comprises a nut.
14. The apparatus of claim 9, wherein there is a spacer overlying said plurality of said bores on said second side of said stanchion, said spacer being disposed between said second tightener and said second side of said stanchion.
15. The apparatus of claim 1, wherein said first jaw assembly, said second jaw assembly, and said at least one bracket, are rotatable relative to said stanchion.
FIELD OF THE INVENTION
 The present invention relates to temporary guardrails and, more particularly, to an apparatus for erecting a temporary guardrail on a stair.
BACKGROUND OF THE INVENTION
 Typically, stairs, particularly of the type in apartment buildings and the like, comprise three major components: stringers, treads and risers, although in certain stair constructions; e.g., pan stairs, there are no risers, open space is being formed between the treads. The stringers can be made of a steel channel beam, wood, etc., the dimensions of which can vary depending upon the load to be carried. As is well known, the treads are the generally horizontal portions of the stair, while the risers are the vertical portions connecting the treads.
 Because of safety concerns during construction or remodeling, it is generally necessary, before a permanent handrail or guardrail is installed, to erect a temporary guardrail or handrail, and thereby minimize the chance of injuries from a construction worker falling off the stair.
SUMMARY OF THE INVENTION
 One object of the present invention is to provide an assembly for erecting a temporary guardrail on a stair.
 Another object of the present invention is to provide an apparatus for erecting a temporary guardrail on a stair, which can be quickly assembled and disassembled, as needed.
 In one aspect, the present invention comprises a stanchion or other elongate member, first and second, spaced jaws connected to the stanchion, which are adapted to rigidly connect the stanchion to the stringer in such a manner that the stringer is substantially perpendicular to the pitch of the stair. The apparatus of the present invention can further comprise, at least one bracket which can receive a temporary handrail; e.g., a 2×4 or the like.
BRIEF DESCRIPTION OF THE DRAWINGS
 FIG. 1 is an elevational view of the front side of one embodiment of the apparatus of the present invention.
 FIG. 2 is an elevational, side view of the apparatus shown in FIG. 1.
 FIG. 3 is an elevational view of the back side of the apparatus of FIGS. 1 and 2.
 FIG. 4 is an isometric, environmental view of a temporary guardrail attached to a stair stringer, using one embodiment of the apparatus of the present invention.
 FIG. 5 is a cross-sectional view taken along the lines 5-5 of FIG. 4.
DESCRIPTION OF PREFERRED EMBODIMENTS
 Referring first to FIGS. 1-3, the apparatus of the present invention, shown generally as 10, comprises a metal tubular member or stanchion 12, having a front side 14, a first side 16, a second, opposite side (not shown), and a back side 18 (FIG. 3). Located generally near the lower end of the stanchion 12 is a first jaw assembly shown generally as 20, a second jaw assembly shown generally as 22 being spaced longitudinally from first jaw assembly 20 in a direction toward the upper end of stanchion 12.
 With reference to FIG. 5, the details of construction of jaw assemblies 20 and 22 are shown. Bottom jaw assembly 20 comprises an L-shaped head portion having a flange portion 24 and a leg portion 26 attached thereto, a threaded shank 28 extending from leg portion 26 and through registering bores 31 and 30 in the front and back sides 14 and 18, respectively. A wing nut 32 is threadedly received on the portion of shank portion 28 extending out of bore 30, a washer 34 being positioned between wing nut 32 and back surface 18. In effect, threaded shank 28 and wing nut 32 comprise a compression assembly for a purpose described hereafter. Second jaw assembly 22 also comprises an L-shaped head portion having a flange portion 36, a leg portion 38, a threaded shank portion 40 extending from leg portion 38 through registering bores 42 and 43 in stanchion 12. A wing nut 44 is threadedly received on the portion of threaded shank 40 extending through back side 18 of stanchion 18. As can be seen, stanchion 12 has a plurality of registering bores 42 and 43, through which threaded shank 40 can extend to allow jaw assembly 22 to be adjustable longitudinally along stanchion 12. To provide strength, a channel shaped spacer 60, effectively a washer, can be used, the spacer 60 overlying the plurality of bores on the back side 18 of stanchion 12.
 As can be seen, FIG. 5 is a cross-sectional view taken along the lines 5-5 of FIG. 4 and accordingly, shows a portion of a stair assembly. The stair assembly comprises treads 46 and risers 48, which are attached in a suitable fashion to stringers 50, 52 which support the stair. For purposes of the following description, the detailed construction of only one of the stringers of the apparatus of the present invention will be described. Further, although a stair with two stringers is shown, it will be apparent that many stairs are constructed against a wall so that only one stringer would have a guardrail. Furthermore, although the stairs shown have risers, as noted above, in the case of pan stairs there are no risers. As can be seen in FIG. 4, the stringers 50, 52 act as side supports for the stair and are generally at the desired pitch of the stairs. Stringer 50 comprises a channel shaped metal beam, having a main beam portion 52 and spaced, laterally extending flanges 54 and 56. As can be seen in FIG. 5, flanges 54 and 56 space beam portion 52 from stanchion 12. It will be appreciated that the stringer 50 need not be channel-shaped but could be a square tubular member, a wooden beam, etc., but in any event, would have a surface 58 spaced from stanchion 12.
 As can be seen in FIG. 5, stringer 50 is received between first and second jaw assemblies 20 and 22, such that flange portion 24 abuts the side 58 of stringer beam portion 54 adjacent flange portion 56. Further, when so positioned, it can be seen that by tightening wing nuts 32 and 44, flanges 24 and 36, respectively, will urge stanchion 18 toward stringer 50, stanchion 12 being compressed against the outer edges of flanges 54 and 56 of stringer 50, thereby rigidly securing stanchion 12 to stringer 50.
 With reference to FIGS. 1-4, it can be seen that the apparatus of the present invention is provided with first and second brackets or tubular members 70 and 72, which are affixed to stanchion 12 by means of bolts 74 and 76, respectively, which extend through registering bores 80, 82 in the front side 14 and back side 18 of stanchion 12. Although brackets 70 and 72 are shown as tubular, they could be L-shaped in construction or for that matter, any other form, the only proviso being that they be adapted to support a temporary guardrail; e.g., a 2×4. As shown, 2×4 temporary rails 84 and 86 are received in brackets 70 and 72, respectively, the rails being secured to the brackets 70 and 72 by fasteners 90 and 92; e.g., a screw, nail or the like, extending through holes 78, 79 of brackets 70, 72, respectively. Threaded wing nuts 75 and 77 are received on bolts 74 and 76, respectively, to secure brackets 70 and 72, respectively, to stanchion 12. It will be appreciated from the above description that jaws 20, 22 and brackets 70 and 72 are rotatable with respect to stanchion 12, such that they can be disposed at any desired angle, if necessary, to accommodate and provide rails which are at any desired angle. However, typically the guardrails are at an angle the same as the angle of the pitch line of the stair, as shown in FIG. 4.
 As is the case with jaw assembly 22, it can be seen that brackets 70 and 72 can be longitudinally adjusted along stanchion 12 by virtue of a plurality of registering bores, such as 80 and 82.
 The above description is intended in an illustrative rather than a restrictive sense, and variations to the specific configurations described may be apparent to skilled persons in adapting the present invention to other specific applications. Such variations are intended to form part of the present invention insofar as they are within the spirit and scope of the claims below.
Patent applications in class Clamp
Patent applications in all subclasses Clamp