U.S. patent number 3,727,975 [Application Number 05/155,711] was granted by the patent office on 1973-04-17 for folding stadium chair.
Invention is credited to Paul G. Anderson.
United States Patent |
3,727,975 |
Anderson |
April 17, 1973 |
FOLDING STADIUM CHAIR
Abstract
A stadium chair has spaced pairs of vertical side members with
attachment means at the bottom of each side member pair for
attachment to the riser face or the horizontal platform of the
stadium row. The vertical members support pivot plates at the level
of the seat. Fiberglass, plastic or cast or forged metal seat
surfaces are attached to the pivots. The rear edge of each seat is
weighted. Each vertical side member pair has a registry hub that
includes a pair of arcuately spaced stops against which resilient
locators on the seat register to predetermine occupied and
unoccupied seat attitudes. A back rest is attached to spaced
support members extending from the vertical side members.
Preferably the registry hubs are compound such that side members
between adjacent seats accommodate pivots for both seats.
Inventors: |
Anderson; Paul G. (Claremont,
CA) |
Family
ID: |
22556497 |
Appl.
No.: |
05/155,711 |
Filed: |
June 23, 1971 |
Current U.S.
Class: |
297/332;
297/336 |
Current CPC
Class: |
A47C
1/121 (20130101) |
Current International
Class: |
A47C
1/00 (20060101); A47C 1/121 (20060101); A47c
001/12 () |
Field of
Search: |
;297/332,333,335,336,249
;287/101 ;248/383 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Zugel; Francis K.
Parent Case Text
This application is a continuation-in-part of copending patent
application Ser. No. 853,695 filed Aug. 28, 1969 and entitled
"Stadium Chair With Folding Seat," now U.S. Pat. No. 3,638,998.
Claims
I claim:
1. A folding chair comprising side members spaced apart to define
the chair width, attachment means at the bottom of each side
member, a chair back secured between the side members, a chair
seat, a seat weight at the back of the seat, a seat support bracket
at each side of the seat adjacent a side member, means securing the
seat to the bracket; a cylindrical shroud projecting from each side
member toward a seat, a registry stop in the shroud adapted to
register the seat support bracket in occupied position, a registry
stop in the shroud adapted to register the seat support bracket in
unoccupied position, a pivot in each support bracket, a bushing
journalling each pivot within the shroud; and contact members on
each seat support bracket adapted to extend into the shroud to
contact a registry stop, each of said contact members including a
contact guide, a contact within the guide, and a spring biasing the
contact toward a registry stop.
2. A folding chair in accordance with claim 1 further comprising a
flange on each support bracket adapted to extend within each side
member shroud adjacent thereto so as to inhibit entry of foreign
matter.
3. A folding chair in accordance with claim 1 further comprising a
pivot boss central of each shroud securing the pivot bushing, and
means securing the pivot in the seat support bracket.
4. A folding chair in accordance with claim 1 wherein each registry
stop comprises a first rib extending from the wall of said shroud
inwardly, a second rib extending inwardly from the wall of the
shroud to join the first rib at its inward termination, each rib of
one registry stop being substantially parallel to a rib of the
other registry stop, and both ribs of a registry stop defining a
dihedral angle.
5. A folding chair in accordance with claim 4 further comprising a
flange on each support bracket adapted to extend within each side
member shroud adjacent thereto so as to inhibit entry of foreign
matter.
Description
BACKGROUND OF THE INVENTION
The invention relates to stadium and theater chairs in which the
seat folds to maximize the exit aisle for the chair occupants.
Stadium chairs must be designed to seat comfortably the maximum
number of people within the stadium or theater confines. Fire and
safety ordinances dictate the distance between rows essential for
exit in accordance with safety standards. Seat front-to-back width
is therefore a compromise between the desire for a maximum number
of rows of chairs safely allowable and the user's comfort
requirements. Therefore, it is desirable to provide a chair whose
components use part of the required exit aisle space when occupied
but which automatically retracts or folds back from the aisle those
forward components projecting so as to leave the minimum required
row to row spacing when the seat or chair is vacated.
The chairs are conventionally used in large quantities and cost per
chair is a major consideration in selecting a design for a
particular site. Complicated folding mechanisms are therefore
unwanted. Since the seat occupant cannot be depended upon to raise
the seat upon leaving the chair, any seat retraction that takes
place is required to be automatic when the seat is vacated. I have
invented a stadium chair which is comfortable, simple to fabricate
in quantity and which has seat components that fold automatically
to accomplish desired row to row aisle clearance.
SUMMARY OF THE INVENTION
The invention contemplates a stadium chair wherein pairs of
vertical members are spaced apart with each pair rising from means
for attaching the chair to the horizontal or vertical surfaces of
the stadium floor and riser defining the stadium row. A pivot
support plate connects the individual vertical members of each
vertical pair adjacent the chair seat level. The seat and the back
rest are preferably of a molded metallic or plastic material
secured between the vertical member pairs. Pivots, which preferably
include self-lubricating bushings, project from the pivot support
plates and attach to the seat at the opposed sides thereof. Each
pivot support comprises a registry hub in which circumferentially
spaced registry stops are adapted to be contacted by resilient
contact members carried by a seat support arm at each side of the
seat. One stop and contact member pair associated with a registry
hub maintain the seat level when it is occupied. The rear of the
seat is weighted or biased to swing downwardly at the rear when the
seat is vacated. A second associated pair of stop and contact
members determine the folded attitude of the seat. The contact
members on the seat support arm at each side of the seat are
resilient to provide overtravel of the seat beyond its registry
attitude to give more room between adjacent rows. Back rest
supports extend from the vertical members of each side member pair
to support each back rest. The seat is restrained by the registry
stops and contact members from touching the back rest when the seat
automatically folds to an upright position.
An object of the invention is to provide a stadium or theater chair
which attaches to either the horizontal or the vertical surface
defining the stadium or theater row.
Another object of the invention is to provide a chair which is
proportioned to hold a user comfortably and which folds such that
the space between adjacent chair rows is wide enough for easy exit
from the row. A further object of the invention is to provide means
of registering the articulating seat in both occupied and folded,
unoccupied positions, with the registry elements being shrouded
against deterioration within a registry hub.
These and other advantages of the invention are apparent from the
following detailed description and drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a fragmentary plan view of a row of stadium chairs in
accordance with the invention joined in a row;
FIG. 2 is a sectional elevation taken along line 2--2 of FIG.
1;
FIG. 3 is a fragmentary sectional elevation taken along line 3--3
of FIG. 2;
FIG. 4 is a detail view of the registry hub of the embodiment of
FIG. 1;
FIG. 5 is a fragmentary detail view of the contact arm of the seat
partly in section;
FIG. 6 is a fragmentary front elevation of an alternate chair
embodiment shown joined to others in a row;
FIG. 7 is a sectional elevation taken along line 7--7 of FIG. 6
with the back removed;
FIG. 8 is a detail view of the registry hub of the embodiment of
FIG. 6;
FIG. 9 is a fragmentary sectional elevation through the registry
hub of the chair of FIG. 6;
FIG. 10 is a sectional view taken along line 10--10 of FIG. 7 with
the seat removed; and
FIG. 11 is a fragmentary sectional view similar to FIG. 10 of a
further alternate embodiment.
In the various views like parts are similarly numbered.
One embodiment of the invention is illustrated in FIGS. 1-5. In
FIG. 1 a plurality of stadium or theater chairs 11, 12, 13 and 14
are joined together by similar vertical side members 16, 17 and the
end chairs 11 and 14 are stabilized by terminating side members 18
and 19. Each side member has a registry hub 21 attached to it by
means of a mounting plate 22. The hub and plate may be integral.
The plate is fastened in each instance to a front vertical brace 24
and a rear vertical brace 25 of the vertical side member. Each
front vertical brace is bent horizontally to define a back support
27 which extends rearwardly of the chair. Each back support has a
transverse end piece 31 to which a seat back 32 is fixed.
The seat back has a metallic frame 34 to which a molded plastic
back member 36 is secured by suitable fasteners extending through
the member to the frame.
The lower ends 24A, 25A of the front and rear vertical braces of
the side member 17 of FIG. 2 are curved and attached to a mounting
bracket 38 by which the side member is fixed to the riser face 39
of a stadium or theater row. The row is defined by the riser face
39 and a floor surface 41. In an alternative embodiment the
vertical members may extend without curving portions and be fixed
to a bracket (not shown) adapted to secure the side member to the
floor surface instead of the riser.
Turning again to FIG. 2, it can be seen that a chair seat 43, like
the seats 43 of the chairs 11-14 of FIG. 1, is in occupied
position. In that FIG. 2 the chair seat shown includes a metallic
frame 45 which has a heavy portion 46 at its rearward boundary and
to which a seat member 48 is suitably secured. A pivot bolt 51
supports a seat frame bracket 52 which has a front support arm 53
and a rear support flange 54. Suitable fasteners secure the seat
frame to the arm and flange of the frame bracket on each side of
the chair.
In FIG. 3 the relationship of the frame bracket 52 to the registry
hub 21 is shown in sectional elevation. The registry hub has an
inner annular wall 56 and an outer annular wall 57 concentric
therewith and having a larger diameter. The hub also has a central
boss 58 with a central cylindrical chamber 59 within which the
semispherical head 61 of pivot bolt 51 lodges. A self-lubricating
bushing 63 intervenes between the chamber wall and the head.
Preferably the bushing is of a resilient plastic material such as
Teflon or other material which is self-lubricating and which is
capable of recovery from distortion to snap around the spherical
head and remain attached to the head.
A lock pin 66 engages the bushing and the boss to maintain the
bushing in the proper position.
Each seat frame bracket has an outer plate 71 with a protruding
boss 72 which is apertured at 73 to receive the shank 74 of the
pivot bolt 51. The shank is threaded and receives a retaining nut
75. A keeper 76 protruding from the apertured wall positions the
bolt axially within the frame bracket.
The frame bracket has an inwardly projecting annular flange 78
whose outer diameter relative to the inner diameter of outer
chamber 57 of the registry hub provides free running between the
two surfaces. The frame bracket is thus free to revolve about the
axis of the pivot bolt with the overlap between the bracket flange
and the hub chamber precluding admission to the hub of
deteriorating materials such as liquid and dirt.
The pivot bolt head is free to move in the bushing in response to
rotation of the frame bracket. It is also desirable that the pivot
bolt be capable of off-axis positions to compensate for
misalignments of the seat with respect to the side member as may be
occasioned by uneven floors or curving rows. Therefore, a conical
relief chamfer 79 at the open end of the bushing enables the bolt
to move off-axis with respect to the spherical bushing opening 81.
Such motion also requires clearance between chamber 57 and flange
78 greater than required just to provide rotating freedom between
the two parts, since the motion of the frame bracket is then
slightly eccentric with respect to the hub.
The described components provide for arcuate movement of the seat
about the pivot bolts 51. In order to provide stops for the
positioning of the seat in occupied and retracted positions,
further elements are combined with those for arcuate movement. The
registry hub 21, for instance, on each side of the seat has
diametrically opposed registry stops 85, 86, each of which is
defined by a pair of diverging ribs 87, 88 extending outwardly from
the back of the registry hub to flush with a bottom 89 of outer
annular wall 57, as can be seen in FIG. 3.
The frame bracket has inwardly protruding contact members 91, 92 of
which contact member 92 is visible in FIG. 3, as well as FIG. 5.
The contact members are divided by an interval 94 into which
central boss 58 of the registry hub fits when the frame bracket and
the registry hub are assembled.
In FIG. 4, the contact members 91, 92 are shown in dotted lines in
registry with the ribs 88 of the registry stops 85, 86,
respectively. As can be appreciated from an inspection of FIG. 5,
the dotted line position therein indicates a substantially
horizontal attitude for frame bracket 52 such that the seat is in
occupied position, as in FIG. 2. When the seat is unoccupied,
biasing weight 46 swings the seat about the pivot bolts 51 such
that the contact members 91, 92 approach the outer surface of ribs
87 of each of the stops. In this position the attitude of the seat
is substantially vertical. The top of the seat may be further moved
toward the back 36 until contact is made between the contact
members and the ribs 87 of both registry stops. Full spacing
between the seat of one row and the back of the lower adjacent row
is thus established.
The lock pin 66 normally retains bushing 63 within the registry
hub. If the bushing is resilient or is split, frame bracket 52 may
be removed from the registry hub without removing the pivot bolt 51
therefrom. Alternatively, nut 75 may be removed and the frame
bracket removed from the pivot bolt with retainer 76 being
displaceable with respect to the bolt because of flat 98 on the
bolt. In either configuration the seat frame brackets are easily
removed from the registry hub of the side members to disassemble
the chair.
In the embodiment of the invention illustrated in FIGS. 6-10 a
plurality of chairs, such as the chairs 101, 102, 103 may comprise
a row. Each chair has pairs of separated side members, such as the
side members 106, 107 of FIG. 7, which members each terminate in
attachment plate 108 which is fixed by bolts 109 to a riser 110 of
a row step 111.
Side member 106 extends in a horizontal arm portion 114 which joins
to side member 107 in a back support portion 116. Attachment cleats
118, 119 protrude from the side member 107 to receive a back, such
as the backs 121, which are not shown in FIG. 7. As is
conventional, the adjoining chairs share the pair of side members
between them and registry hubs 124 extend from either side of the
side members toward the seat. The side members at the end of each
row conventionally have hubs extending only in one direction.
As can be seen in FIG. 7, the side members of each pair may be
connected by a web 126. To reduce weight and material, the web has
an aperture 127 defined by a closed figure flange 128. In part, the
registry hub at each side member pair extends from the web 126. As
can be seen from FIG. 8, each registry hub 124 is substantially
similar to the hub of the previously described embodiment, having
an annular wall 56 defining an annulus 57 and a central boss 58
with an annulus 59 therein extending from the vertical wall 126A of
the registry hub. Registry stops 85,86 are diametrically opposed
within annulus 57, as in the previously described embodiment. Each
registry stop has stop surfaces 87, 88, against which the contact
members 131, 132 of a seat frame bracket 133 register to determine
seat position.
FIG. 10 shows hubs 124, 124A extending toward adjacent seat frame
brackets 133, 133A of adjacent seats (not shown). The seats share
the side member pair 106, 107, as for instance, seats 101, 102 of
FIG. 6. Each hub is like the hub 124 of FIG. 8.
The frame brackets 133, 133A are substantially identical and a
description of one will suffice for both. They are, of course,
right and left hand types. Each frame bracket has an elongate arm
53 terminating in attachment flanges 54, 54A. An exterior boss 72
with an aperture 73 fits about a pivot bolt 51. The bolt has a
spherical head 61 within a split bushing 163 and a threaded shank
74 extending outwardly of the boss. A nut 75 secures the bolt in
the frame bracket, which in turn is secured by the bolt in the
registry hub. A lock pin 134 common to the bushings 63 of both hubs
124, 124A holds the bushings in place.
The outer plate 71 of the frame bracket has an inner flange 78
which resides inside annular wall 57 of the hub. The overlap of the
flange and wall precludes entry of dirt into the hub, protecting
the moving parts thereof from deterioration.
From plate 71 a pair of separated contact member guides 135, 136,
of which guide 136 is visible in FIG. 10, extend into the registry
hub. Guide 135 contains contact member 131 and guide 136 contains
contact member 132. Each member is biased outwardly by a
compression spring 138 lodged in a cavity 139 of the member. Each
contact member carries a transverse limit pin 141 which extends
into slots 143 on each side of the guide containing the member to
limit the travel of the member with respect to the guide
In FIG. 9, the seat is shown in the process of descending under the
weight of an occupant. When fully seated, contact member 132, with
its contact pad 145, rests against registry rib 88 of stop 85,
while the end wall 147 of guide 135 of contact member 131 rests
against rib 88 of stop 86. The weight imposed upon the seat is thus
absorbed by both stops of the registry hub.
The broken lines 149 of FIG. 9 illustrate the attitude of the
contact members when the seat is unoccupied and biased into
vertical position by the weight 46 at the back edge of the seat
(FIG. 7). Freedom for further movement of the seat front edge
toward the back of the chair is afforded by the resilience of the
contact member 131 touching rib 87 of registry stop 85.
The pivot bolt bushing 163 is divided into upper and lower halves
151, 152, respectively, for ease in assembly and fabrication. Each
half is indented peripherally at 154 to provide for the lock pin.
Each half is also chamfered to allow off-axis freedom for the pivot
bolt shank as the spherical head 61 of the bolt moves in a socket
81 defined by the two bushing halves.
In the further alternate embodiment shown in FIG. 11, the pivot
bolt bushing 158 is not split, but differs from the previously
described bushings 63 and 163 in having a barrel-like outer
configuration. The periphery 159 is generated by an arc revolved
about the axis of a central cylindrical chamber 161 within which a
cylindrical pivot bolt shank 162 of a headless pivot bolt 164
resides. Off-axis freedom is imparted by the ability of the bushing
158 to rock within the cylindrical chamber 59 of boss 58.
In other respects the embodiment of FIG. 11 is substantially
identical to the embodiment of FIG. 7, both operating automatically
to fold the seat when empty and registering the seat in occupied
position. In all embodiments the moving parts are shrouded within
the registry hub away from damage, although easily accessible for
adjustment or disassembly.
Modifications within the scope of the invention other than those
shown will occur to those skilled in the particular art. It is
therefore desired that the invention be measured by the appended
claims rather than by the illustrative disclosures made herein.
* * * * *