U.S. patent number 3,858,850 [Application Number 05/390,230] was granted by the patent office on 1975-01-07 for adjustable picket rail assembly for stairways.
This patent grant is currently assigned to W-T Industries, Inc.. Invention is credited to George A. Glass, Frederic R. Maxcy.
United States Patent |
3,858,850 |
Maxcy , et al. |
January 7, 1975 |
ADJUSTABLE PICKET RAIL ASSEMBLY FOR STAIRWAYS
Abstract
The rapid and economical assembly of raked rails for stairways
permitting the adjustment of the railing assembly to variable
angles ranging from about 35.degree. to 42.degree., to the
horizontal. The top and bottom picket rails of the assembly are
constituted of channel-shaped metal extrusions, the oppositely
facing webs of which are broached to form spaced deformable tabs,
each of which is provided with at least one opening. The opposite
ends of hollow pickets of extruded metal, provided with at least
one screw boss extending longitudinally on the interior thereof,
are affixed to the vertically aligned tabs in said webs of the
picket rails, with the free ends of the tabs extending in opposite
directions. A rocking of the rails in opposite directions results
in the deformation of the tabs within the confines of the picket
rails to impart the desired adjustable angularity to the latter
while the pickets remain vertical. The ends of picket rails are cut
at an angle conforming to the desired rake angle and are fitted
with fastening straps or splines which are mitered to the same
angle for fastening to vertical newel posts at the terminals of the
picket rails, which rigidifies the assembly at the desired rake
angle.
Inventors: |
Maxcy; Frederic R. (Ellicott
City, MD), Glass; George A. (Baltimore, MD) |
Assignee: |
W-T Industries, Inc.
(Baltimore, MD)
|
Family
ID: |
23541643 |
Appl.
No.: |
05/390,230 |
Filed: |
August 21, 1973 |
Current U.S.
Class: |
256/22;
256/24 |
Current CPC
Class: |
E04F
11/1834 (20130101) |
Current International
Class: |
E04F
11/18 (20060101); E04h 017/16 () |
Field of
Search: |
;256/21,22,24,59,65,66-70 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Taylor; Dennis L.
Attorney, Agent or Firm: Lebowitz; Samuel
Claims
We claim:
1. An adjustable rail assembly for a stairway comprising spaced
upper and lower picket rails disposed at an angle to the horizontal
with spaced hollow vertical pickets extending therebetween,
a. said picket rails being formed of channelled sections of
extruded material with the respective central webs thereof facing
each other,
b. a plurality of tabs stamped and broached from the central web of
the upper rail spaced from each other and each readily deformable
from the plane of said web along an axis substantially
perpendicular to the longitudinal axis of the rail at a level
higher than the cut at the free edge of the respective tab,
c. each of said tabs having an opening therein,
d. a plurality of tabs stamped and broached from the central web of
the lower rail spaced from each other corresponding to the spacings
of the tabs in the upper rail, and in the opposite direction, and
each readily deformable from the plane of said lower web along an
axis substantially perpendicular to the longitudinal axis of the
rail at a level lower than the cut at the free edge of the
respective tab,
e. each of said last-mentioned tabs having an opening therein,
f. said spaced vertical pickets formed from predetermined lengths
of hollow extruded material formed with an integral screw boss as
an integral part of an interior wall surface and adapted for
aligment with said openings,
g. self-engaging threaded screw fasteners extending through said
openings in said tabs into penetrating threaded engagement with the
screw boss at the ends of the hollow pickets adjacent to each tab,
and
h. said tabs readily bent from the planes of the respective webs at
angles corresponding substantially to the inclination of the
stairway relative to the horizontal, to dispose said tabs and end
portions of said pickets within said picket rails.
2. A rail as set forth in claim 1, wherein the angularity of said
tabs relative to the planes of the respective webs is adjustable
between approximately 35.degree. to 42.degree. to adjust the rake
of the rail assembly to that of the stairway on which it is adapted
to be installed.
3. A rail assembly as set forth in claim 1, wherein said hollow
vertical pickets are of substantially rectangular section and with
the integral screw boss on the interior thereof extending along the
entire length thereof.
4. A rail assembly as set forth in claim 1, wherein said tabs are
of substantially rectangular outline, each of a length slightly
greater than its width and the hollow vertical pickets are of
substantially square cross-section having an external dimension
nearly that of the width of said tabs.
5. A rail assembly as set forth in claim 1, wherein the opening in
each of the tabs in the upper and lower rails is of oval shape with
its long axis coincident with the longitudinal axis of the rails,
and the spaced vertical pickets are of square cross-section having
a screw boss on the opposite sides of the interior thereof, one
adapted for engagement with the fasteners extending through the
openings in the tabs of the upper rail and the other adapted for
engagement with the fasteners extending through the openings in the
tabs in the lower rail.
6. A rail assembly as set forth in claim 1, including a vertical
post of polygonal cross-section at the overlying terminals of said
picket rails, and means for affixing the ends of said picket rails
to said vertical post.
7. A rail assembly as set forth in claim 6, wherein said
last-mentioned means comprises a U-shaped fastening strap seated
within the ends of the channeled sections of said picket rails with
the legs thereof affixed to the sides of the picket rail and the
base thereof disposed in a vertical plane for abutting contact with
a face of said vertical post.
8. A rail assembly as set forth in claim 7, wherein said polygonal
vertical post is provided with a longitudinal slot extending along
the length thereof, to permit the passage of a bolt through an
opening in the base of said fastening strap and through said slot
for integrating the parts with a nut engaging the end of the
bolt.
9. A rail assembly as set forth in claim 6, wherein the ends of
said picket rails are mitered at an angle corresponging to the rake
of the stairway.
10. A rail assembly as set forth in claim 9, including a retaining
clip affixed to the junction of said vertical post and upper rail,
and a hand rail engageable with said retaining clip for concealing
the tabs, the upper end portions of said pickets and the screw
fasteners interconnecting them.
11. An adjustable rail assembly for a stairway comprising spaced
upper and lower picket rails disposed at an angle to the horizontal
with spaced hollow vertical pickets extending therebetween,
a. said picket rails being formed of channeled sections of extruded
material with the respective central webs thereof facing each
other,
b. a plurality of tabs stamped and broached from the central web of
the upper rail spaced from each other and each readily deformable
from the plane of said web along a bending axis substantially
perpendicular to the longitudinal axis of the rail at a level
higher than the cut at the free edge of the respective tab,
c. a plurality of tabs stamped and broached from the central web of
the lower rail spaced from each other corresponding to the spacings
of the tabs in the upper rail and in the opposite direction, and
each readily deformable from the plane of said lower web along a
bending axis substantially perpendicular to the longitudinal axis
of the rail at a level lower than the cut at the free edge of the
respective tab,
d. each of said tabs in the upper and lower rails having a pair of
openings therein displaced longitudinally from each other between
the bending axis of each tab and the free end thereof, and
constituting inner and outer openings relative to said bending
axis.
e. said spaced vertical pickets formed from predetermined lengths
of hollow extruded material formed with an integral screw boss as
an integral part of an interior wall surface and adapted for
alignment with said openings,
f. a self-engaging threaded screw fastener extending through one of
the openings in each of the tabs of the upper rail in penetrating
threaded engagement with the screw boss at the end of the hollow
picket adjacent to the respective tab,
g. a self-engaging threaded screw fastener extending through the
oppositely designated opening in each of the tabs of the lower rail
in penetrating threaded engagement with the screw boss at the end
of the hollow picket adjacent to the respective tab, and
h. said tabs being readily bent from the planes of the respective
webs at angles substantially corresponding to the rake of the
stairway relative to the horizontal, to dispose said tabs and end
portions of said pickets within said picket rails.
12. A rail assembly as set forth in claim 11, wherein said
first-mentioned screw fastener extends through the outer opening in
each tab in the upper rail, and the last-mentioned screw fastener
extends through the inner opening in each tab in the lower
rail.
13. A rail assembly as set forth in claim 12, wherein the
angularity of said tabs relative to the planes of the respective
webs is adjustable between approximately 35.degree. to 42.degree.
to adjust the rake of the rail assembly to that of the stairway on
which it is adapted to be installed.
14. A rail assembly as set forth in claim 12, wherein
a. said picket rails and hollow pickets are fabricated from an
extrudable aluminum alloy,
b. said tabs are of substantially rectangular outline, each of a
length, in the direction of the longitudinal axis of the rails,
slightly greater than its width, and
c. said hollow vertical pickets are of square cross-section having
an external dimension nearly that of the width of said tabs with
the screw boss on the interior wall surface of the width of each
picket adjacent to the outer edge of each tab of the upper
rail.
15. A rail assembly as set forth in claim 14, wherein said openings
in said tabs in the upper and lower rails are of oval shape with
the long axis thereof coincident with the longitudinal axes of said
rails.
Description
This invention relates to a rail assembly for stairways which may
be assembled quickly and economically from extruded metal
components, and which may be adapted to stairways of varying rake
angles.
It is the object of the present invention to provide a rugged and
reliable rail assembly for stairway which is composed essentially
of standard prefabricated components, and which may be adapted to
meet the needs of varying architectural and structural designs
without entailing the costs of fabrication according to set
specifications.
It is another object of the invention to provide a rail assembly
for stairways which lends itself to variations in the utilization
of its components, so that rails with conventional pickets may be
interspersed with pickets which retain panels of colored or
translucent plastic material to attain distinctive ornamental and
artistic effects. Alternatively, the rail assembly may be formed
entirely of conventional pickets or pickets framing plastic panels,
to the exclusion of the other.
It is a further object of the invention to provide a rail assembly
for stairways which may be fabricated by mass production procedures
at the factory, preparatory to assembly procedures which may be
executed at that point, or at the point of utilization immediately
prior to the mounting thereof on the construction site. In the
latter case, all of the advantages of shipping and packaging of
knockdown constructional components are realized.
Other objects and purposes will appear from the detailed
description of the invention following hereinafter, taken in
conjunction with the accompanying drawings, wherein.
FIG. 1 is a front elevation of the preliminary assembly of the top
and bottom picket rails and pickets extending therebetween;
FIG. 2 is a front elevation of the rail assembly in its
substantially completed form, mounted on a stairway;
FIG. 3 is an enlarged vertical sectional view along line 3--3 of
FIG. 1 with the mid-portion of the pickets indicated in dot-dash
lines;
FIG. 4 is a vertical sectional view along ling 4--4 of FIG. 3;
FIG. 5 is a vertical sectional view with certain parts in section,
showing the assembly of FIG. 4 following the racking of the
assembly to the desired angle from that shown in FIG. 1 to that
illustrated in FIG. 2;
FIG. 6 is a horizontal sectional view along line 6--6 of FIG.
1;
FIG. 7 is a horizontal sectional view along line 7--7 of FIG. 1, to
illustrate a preferred embodiment of a picket construction;
FIG. 8 is a horizontal sectional view along line 8--8 of FIG. 2, to
illustrate a portion of the railing having a panel of plastic
material extending between a pair of adjacent hollow pickets;
FIG. 9 is a horizontal sectional view, similar to FIG. 6, showing a
picket rail with the broached tabs therein provided with a single
opening therein;
FIG. 10 is a horizontal sectional view of another embodiment of a
hollow picket, as a variant of that shown in FIG. 7, which may be
used with the picket rail shown in FIG. 9;
FIG. 11 is a sectional view along line 11--11 of FIG. 2;
FIG. 12 is an isometric view of the mounting straps at the ends of
the picket rails for fastening the latter to the newel posts or
columns mounted on the stairway;
FIG. 13 is a sectional view along line 13--13 of FIG. 2; and
FIG. 14 is sectional view along 14--14 of FIG. 2.
In the drawings is shown the basic rail assembly for a stairway S,
which preferably is fabricated from lengths of extruded metal such
as aluminum alloys. The top rail 10 is formed of a continuous
extrusion of generally channeled-shaped cross-section, having the
web 12 extending between the walls 11, which walls are provided
with inwardly facing flanges 13 at the free ends of the walls 11,
and flanges 13' on the interior thereof in close proximity to the
web 12. The bottom picket rail 20 is preferably formed from the
same continuous extrusion as rail 10, and is comprised of the web
22 extending between walls 21 which terminate in inwardly directed
flanges 23 at the ends of the walls and flanges 23' adjacent to the
web 22. The flanges not only reenforce the rails but serve as
guides for mounting straps or solid splines which serve to
interconnect the rails with the supporting posts.
In the preferred embodiment of the invention, rectangular tabs 30
are broached from the web of the channeled extrusion, as clearly
shown in FIGS. 4 to 6, which tabs are severed along two lateral
edge 32 parallel to and equidistant from the longitudinal axis of
the picket rail, and which are spanned by the transverse edge 31
slightly displaced from the plane of the web 12 by virtue of the
inclined portion 34 at the end of the tab remote from the free end
31, which permits the tab to be deformed along the axis 34',
substantially perpendicular to the longitudinal axis of the
rail.
Apertures or openings 35 and 36 are stamped in the tabs 30 at the
same time that the boundaries of the tabs are broached, and
preferably these openings are of oval shape to permit manufacturing
and assembly tolerances when the pickets are integrated with the
picket rails.
The bottom rail 20 is fabricated from the same continuous length of
extrusion as the top rail, and the desired lengths of the top and
bottom rails, for example, 5 or 6 feet, are assembled by disposing
them in the relation shown in FIG. 1, with the webs facing each
other, but with the tabs 30 extending in opposite directions. The
webs are spaced from each other corresponding to the desired
vertical spacing between them and the lengths of the hollow
vertical pickets P adapted to extend therebetween, which, as shown
in FIG. 7 is formed of a hollow extrustion of rectangular or square
cross-section having the four faces 1, 2, 3 and 4 with the screw
boss 5 cast integrally on the interior of one of the faces, for
example, face 1.
As shown in FIG. 4, the screw boss 5 is disposed in alignment with
the aperture 35 which is adjacent to the free end 31 of the tab 30
while the screw boss 5 is adjacent to the aperture 36 in the tab of
the lower rail which is remote from the free edge 31. Screw
fasteners F, for example size 10, are passed through the apertures
35 and 36 and are driven into the screw boss 5 adjacent to the tabs
30. Thus, the several pickets are fixed between the top and bottom
rails, following which the top and bottom rails are rocked in
opposite directions, for example, the top rail 10 to the left, and
the bottom rail 20 to the right, so that the parts assume the
position shown in FIG. 5 wherein the tabs are deformed about the
axes 34' to dispose them within the confines of the channels of the
top and bottom rails which conceal the fasteners F as well as the
opposite end of the pickets P.
The degree of the rocking movement may vary so that the angles
assumed by the rails 10 and 20 may range from 35.degree. to
42.degree. to the horizontal, to render the angularity of the rail
assembly adjustable so that it may be adapted to variations in the
rake of the stairway on the construction site following the
preliminary assembly of the railing at the factory or at the
building site.
The invention permits the utilization of hollow pickets of
different sections, and variations of the picket shown in FIG. 7,
of square cross-section, may be utilized. The outlines of the
deformable tabs may be modified accordingly. Of course, dimensions
of the tabs vary with the cross-sectional dimensions of the
pickets. Tabs or tongues having a length of 1.198 inches and a
width of 0.770 inches have proven very practical in conjunction
with pickets of 3/4 inches square section.
FIG. 8 illustrates an assembly in which a screw boss 5 extends on
the interior of an open-faced picket P' of the same external
dimensions as the pickets P described above, so that, in effect,
the picket is of channel-shape cross-section. Such a structure
permits the interspersion of channel-shaped pickets P' amongst the
closed perimetric pickets P and, as indicated in FIGS. 1 and 2,
such an arrangement renders possible the insertion of a panel 7 of
plastic material of approximately 1/4 inches thickness, which may
be set within gaskets G to secure the panels 7 between the pickets
P', as shown in FIG. 8. The panels 7 may alternate with one or more
plain pickets P or may be used to the exclusion of the latter.
FIGS. 9 and 10 illustrate a modified arrangement from that shown in
the preceding embodiments. In this case, the tabs 40 are stamped
with a single opening 41 and use is made of a picket P" having the
same external dimensions as the pickets P described above, but
which is provided with an additional screw boss 6 on the interior
of the picket, laterally displaced from the screw boss 5, which is
cast integrally with the face 1. Thus, in the assembly of the
picket rails and pickets in this construction, the fasteners F pass
through the openings 41 into driving enagement with the screw boss
5, and the fasteners F in the bottom rail pass through the openings
41 in the tabs 40 for engagement with the screw boss 6.
As is the case in the previously described embodiments, the
openings 41 in the tabs 40 may be punched out at the same time that
the tabs are broached from the planes of the webs and preferably
are of elondated form to allow for variations in alignment and
assembly procedures.
Following the assembly of the top and bottom rails with the pickets
extending therebetween, the rails are affixed to the newel posts or
columns C at the top and bottom of the stairway, as shown in FIG.
2. As shown in FIG. 12, the U-shaped fastening straps U are cut
from a continuous extrusion E with the lateral straps 45 cut at an
angle A corresponding to the rake of the stairway. The U-shaped
fastening strap U is fitted within each end of the rails by
accommodating the lateral walls 45 within the channel of the picket
rails between the internal flanges 13 and 13' in the top rail and
23 and 23' in the bottom rail. Self-tapping screws 50 serve to
integrate the lateral straps 45 with the side wall 11 and 21 of the
picket rails.
The web 46 extending between the lateral straps 45 is provided with
a central aperture 47 for the reception of a bolt 52 extending
through the opening and through longitudinal slot C' into the newel
post C. The assembly is tightened to the post by means of nut 53
acting on the end of the bolt opposite the head 51 and washer 54.
If desired, solid splines having inclined top faces corresponding
to the rake angle may be affixed to the post C for supporting the
ends of the picket rails, as described in application Ser. No.
371,384, filed July 19, 1973.
As indicated in FIG. 12, the angle A defining the angularity of the
fastening straps 45 and the vertical edge corresponds to the rake
angle of the rail assembly. Thus, if the stairway has an
inclination of 35.degree. to the horizontal, angle A is 55.degree..
Should the inclinations to the horizontal plane be less, the angles
A' and A" may be varied, as indicated in FIG. 12, to accommodate
the rail assembly to the decreasing inclinations of the stairway.
Correspondingly, the walls 11 of the top rail, and 21 of the bottom
rail, are mitered to the same degree as the rake angles of the
attaching straps C, so that these abut closely the newel posts C,
as indicated in FIG. 2.
Following the fixation of the terminals of the rail assembly to the
newel posts C at the top and bottom of the stairway, the top rail
may be finished in any desired way. As shown in FIGS. 13 and 14,
the post clips 60 are affixed to longitudinally displaced points of
the top rail 10 by engagement of screw fasteners F within the screw
bosses 56 of the post C. Thereafter, a top hand rail H, of any
desired section, is adapted to be snapped into engagement with the
post clips, for example, at points 61 and 62 of the latter, to
integrate the assembly and impart a finished appearance
thereto.
Rail assemblies of extended length may be fabricated by extending
the picket rails from the opposite sides of the posts or columns C,
as shown in FIGS. 11 and 14. When the rails assume a change in
direction, posts are employed which are provided with longitudinal
slots C' in faces which are in planes at desired angles relative to
the plane whereat the picket rails are joined to the posts. Thus, a
post or column C having the longitudinal slot C' in the side 65
thereof would serve to mount and direct the rail assembly in a
direction perpendicular to the assembly as shown.
* * * * *