U.S. patent number 3,638,998 [Application Number 04/853,695] was granted by the patent office on 1972-02-01 for stadium chair with folding seat.
Invention is credited to Paul G. Anderson.
United States Patent |
3,638,998 |
Anderson |
February 1, 1972 |
STADIUM CHAIR WITH FOLDING SEAT
Abstract
A stadium chair has spaced pairs of vertical side members with
means at their bottoms for attachment to the riser face or the
horizontal platform of the row. The vertical members support hinge
plates at the level of the seat. Fiber glass, plastic or sheet
metal seat surfaces secured to metal outside frames are pivotally
mounted to the plates. The rear edge of each seat is weighted. The
front of each vertical member has a seat stop against which the
seat frame registers when the seat is occupied. A backrest similar
to the seat is attached to spaced support members extending from
the vertical members. The support members may be either rigidly or
articulately attached to the front vertical members.
Inventors: |
Anderson; Paul G. (Claremont,
CA) |
Family
ID: |
25316680 |
Appl.
No.: |
04/853,695 |
Filed: |
August 28, 1969 |
Current U.S.
Class: |
297/332 |
Current CPC
Class: |
A47C
7/56 (20130101); A47C 1/12 (20130101) |
Current International
Class: |
A47C
1/00 (20060101); A47C 7/00 (20060101); A47C
7/56 (20060101); A47C 1/12 (20060101); A47c
001/02 (); A47c 001/06 (); A47c 001/12 () |
Field of
Search: |
;297/332,335,248,445,301,336 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
34,741 |
|
Feb 1935 |
|
NL |
|
366,618 |
|
Feb 1932 |
|
GB |
|
475,842 |
|
May 1929 |
|
DD |
|
550,212 |
|
Dec 1942 |
|
GB |
|
Primary Examiner: Franklin; Jordan
Assistant Examiner: Krizmanich; George H.
Claims
I claim:
1. A folding chair comprising spaced-apart side members, each side
member having a pair of vertical members terminating in a single
attachment means at the bottom, a seat frame, a seat member fixed
to the frame to define therewith a seat, a weighted area at the
back of the seat, a pivot bushing on each side member securing the
seat frame between the side members; a back support secured to each
side member, a back frame secured between opposite back supports, a
back member fixed to the back frame; said pivot bushing on each
side member extending seatward from each side member, a limit
bracket on the seatward end of each pivot bushing having two
registry positions, a contact arm on the seat frame at each of two
opposed sides thereof, a flange on the contact arm adapted to
contact the registry positions, and a pivot pin on each contact arm
journaled in each of said pivot bushings.
2. A folding chair comprising spaced-apart side members, each side
member having a pair of vertical members terminating in an
attachment means at the bottom, a seat, a weighted area at the back
of the seat, a seat frame to which the seat is secured, a pivot
bushing on each side member securing the seat frame between the
side members; a back support on each side member, a seat back
secured to the back support on each side member; said pivot bushing
on each side member extending seatward from each side member, two
registry positions extending seatward from each side member, a
contact arm on the seat frame on each of two opposed sides thereof,
two contact surfaces on each contact arm on the seat frame adapted
to alternately meet the registry positions, and a pivot pin on each
contact arm journaled in each of said pivot bushings.
Description
Stadium chairs must be designed to seat comfortably the maximum
number of people within the confines of the stadium or theater.
Fire ordinances dictate the interval between rows that must be
available for seat users to exit. Seat width is a compromise
between the desire for maximum units and user comfort requirements.
Therefore, it is desirable to have a seat whose components use part
of the exit aisle space when occupied but which retracts or folds
back those components to afford the minimum row spacing when the
seat is vacated.
Since the chairs are conventionally used in great quantity, the
cost per chair is a major consideration in design. Complicated
mechanisms to induce folding are undesireable. The seat occupant
cannot be depended upon to operate the seat after he rises. Any
seat folding which takes place should be automatic when the seat is
vacated.
I have invented a stadium chair which is comfortable, simple to
fabricate, and which has components that fold automatically to
accomplish desired row-to-row clearance.
BRIEF SUMMARY OF THE INVENTION
The invention contemplates stadium chairs wherein spaced vertical
member pairs rise from means for attaching the vertical members to
either the vertical face of the stadium risers or the horizontal
base of the stadium row. A pivot support plate connects the
individual vertical members of each vertical pair at approximately
the seat level. The seat and the backrest are preferably of a
shaped metallic or plastic or fiber glass material secured to a
rigid metal frame. Pivots, which preferably comprise
self-lubricating bushings, project from the pivot support plates
and attach to the metal frame of the seat. Seat stops on the front
vertical member of each pair maintain the seat level when it is
occupied. The rear rim of the seat is weighted to swing downwardly
when the seat is vacated. Backrest supports extend from the front
vertical member of each pair to support a metal-framed backrest.
Thus, the seat automatically moves to a folded position nearer the
central vertical axis of the chair when the chair is unoccupied
than the attitude which it has when the chair is occupied.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a fragmentary plan view of a row of stadium chairs in
accordance with the invention;
FIG. 2 is a fragmentary front elevation of the chairs of FIG.
1;
FIG. 3 is a side elevation of a chair of the embodiment of FIG.
1;
FIG. 4 is a sectional elevation taken along line 4--4 of FIG.
1;
FIG. 5 is a fragmentary sectional elevation taken along line 5--5
of FIG. 2;
FIG. 6 is a side elevation of an alternate embodiment of the
invention;
FIG. 7 is a front elevation of the chair of FIG. 6;
FIG. 8 is a side sectional elevation of an alternate embodiment of
the invention having an articulated back;
FIG. 9 is a fragmentary side sectional elevation of the embodiment
of FIG. 8 showing the back and seat folded;
FIG. 10 is a fragmentary sectional elevation of a further alternate
embodiment of the invention fixed to a sloping riser;
FIG. 11 is a fragmentary sectional elevation of a still further
alternate embodiment of the invention; and
FIG. 12 is a fragmentary section taken along line 12--12 of FIG.
11.
FIGS. 1 through 5 illustrate a preferred embodiment of my
invention. FIG. 1 shows in plan a partial row of stadium chairs 15,
16, 17, and 18. Chairs 15 and 16 are also shown in FIG. 2. Each
chair comprises a seat 21, a back 22 and side members 25. Adjacent
chairs share a side member. Terminating side members 26 are
outboard of chairs 15 and 18.
As can be seen in FIG. 3, each side member comprises a front
vertical brace 31 and a rear vertical brace 32. The braces
terminate at the bottom in an attachment bracket 33 by means of
which the side member is fastened to the vertical riser face 35 of
a stadium row 36.
Each front vertical brace is bent horizontally to define a back
support 38 which extends rearwardly of the chair. Each back support
has a transverse endpiece 41 which fixes one side of each adjacent
chair back between the side members.
A registry stop bar 43 is fixed to each side member at the front
vertical brace. The row of chairs shown in FIGS. 1 and 2 has a
common stop bar which also adds stability to the adjoined
chairs.
A support plate 45 is secured to the front and rear vertical braces
of each of the side members near the vertical middle of the member.
A pivot bushing 47 extends from both faces of each support plate
with the exception of those support plates on the terminal side
members 26. Each bushing journals a pivot pin 48 held in an arm 49
fixed to the seat frame. The bushing may be of the barrel or cone
type.
Turning now to FIGS. 4 and 5, which illustrate an identical
individual chair to those of FIGS. 1 and 2, each back 22 of a chair
can be seen to have a rigid back frame 51 of which the top and
bottom portions 52, 53 are seen. The back frame of each chair holds
a back sheath 55 which is secured to the frame by conventional
fasteners. Transverse endpieces 41 of each side member are fixed to
the vertical side portions of the back frame to secure the back in
position between the side members.
Each seat 21 comprises a rigid seat frame 56 to which is attached a
seat sheath 57. While seats and backs having separate frame and
sheath elements are shown, it is to be understood that seats and
backs wherein the frame and sheath portions are integrally formed
are equally comprehended within the scope of the invention. The
rearward portion 58 of the frame, whether separate or integral with
the sheath, is substantially heavier than the rest of the frame
such that the seat is biased to pivot about the pair of pivots 48
each mounted in an arm 49 depending from a side portion of the seat
frame. Preferably the pins are removably mounted in the arms as
shown in FIG. 12.
As can be seen in FIG. 5, pivot pins 48 are journaled in pivot
bushings 47 by a bearing or bushing 63 which is preferably a
self-lubricating type. The horizontal position of the bushing is
selected in accordance with the seat-biasing weight, the fulcrum
point moving forward or back in accordance with the decrease or
increase of the weight. By using barrel or cone bushings it is
possible to compensate for chair rack which may occur due to uneven
base conditions.
The pivots, fixed to each portion of the chair side frame,
pivotally mount each chair seat between the side members such that
the seat folds into the substantially vertical position shown in
FIG. 5 when the seat is vacant, nearer to a central vertical axis
of the chair, under the influence of weighted seat frame portion
58.
When the seat is occupied, the weight bias is overcome and the seat
pivots into the position of FIGS. 3 and 4, wherein registry stop
bar 43 supports the seat forward of pivot 48 as long as the seat is
occupied.
The seat and back sheaths 57, 55, secured to the respective frames
may be of sheet metal, fiber glass or plastic. Each of these
materials may be formed into a seat or back sheath member having a
support area and a surrounding flange or skirt, which skirt may be
thickened in one embodiment to define the rigid frame.
Alternatively, the material may be thick enough to provide support
to a user and attain rigidity through combination with a separate
frame.
The side braces may be made of tubing, which is conveniently formed
into the shapes shown in the illustrative Figures. The embodiment
of FIGS. 1 through 5 has the advantage of light weight coupled with
strength due to the closed configuration defined by the spaced
front and rear braces joined by the attachment means and the back
support member. Although the tubular members represent the
presently preferred form, side members cast integrally are not
precluded.
FIGS. 6 and 7 show an alternate embodiment of the invention wherein
the side members are comprised of a single metallic piece bent into
a wide U-shape as viewed from the front of the chair. The chair 70
of this embodiment has spaced vertical side members 71, 72 from
each of which back supports 73 extend rearwardly of the chair. Each
back support has an integral transverse portion 74 fastened to an
outer back frame 75. A back sheath 76 is fixed within the frame by
suitable fasteners 77. The back sheath may be of similar material
and configuration to the back sheath 55 previously described.
The chair 70 has a seat 81 with a seat sheath 82 secured to a rigid
angle frame 83. A weight bias bar 85 is fixed to the rear edge of
the frame. The weight biases the rear of the seat to pivot
downwardly about a pivot 86 fastened in each side portion of the
seat frame at each side of the seat and journaled in a stop angle
88 secured to the inner face of each of the side members. Each stop
angle has a flat flange 89 cut away a 91 such that the seat may
pivot into a vertical orientation closer to a central vertical axis
of the chair. When the seat is occupied the frame 83 registers
against the bottom flange of the stop angle, supporting the chair
in seating position.
Each vertical side member bends inwardly in an attachment portion
93 and is joined to a flange 94 from which a sleeve 95 depends.
Preferably the side members and the attachment portions are
integral, as previously mentioned. A post 96 secured in the base of
the stadium row by a flange 97 receives the sleeve. A pin 98
extends through aligned holes in the sleeve and the post. The post
determines the chair height and prevents chair turning on the post.
Additional holes such as the hole 99, in either the sleeve or the
post, may be provided for height adjustment.
Obviously post 96 can be bent at right angles such that the flange
97 may alternatively be attached to the vertical surface of the row
riser.
FIGS. 8 and 9 illustrate another embodiment of the invention
wherein a folding stadium or other chair 101 has transversely
spaced side members each having a front vertical brace 103 and a
rear vertical brace 104 secured in spaced relationship at their
tops by an arm rest 105. The bottoms of the braces of each side
member turn inward transversely and join at a plate 107 fixed to a
depending sleeve 108 by which the side members may be attached to a
post (not shown) fixed at the chair site in the stadium or other
like location.
The horizontal run 110 of each side member brace at the bottom
depends upon the desired width of a seat 112. The seat has a seat
sheath 113 fixed to a tubular seat frame 116 from which a mounting
arm 117 depends on each side of the frame. A weighted framed
portion 119 at the rear edge thereof biases the rear of the seat to
pivot downwardly when not occupied about a pair of aligned pivots
121 each carried by an arm 117 and extending into a pivot bushing
(not shown) similar to the bushing described with respect to the
embodiment of FIG. 1. The bushings may be fixed to rear vertical
braces 104.
A chair back 125 is supported from the side members by a tubular
back support 127 which has spaced vertical arms 128 connected at
their tops by a transverse portion 129 and spaced horizontal arms
131 mounted by a pivot pin 132 in each arm to a front vertical
brace 103. Pivot 132 is carried by a boss 135 on each horizontal
arm which extends inwardly from brace 103 to a position beneath the
sides of the seat frame 116. The boss acts as a registry stop when
the seat is occupied, contacting seat frame 116 and supporting the
forward extension of the seat beyond pivot point 121. In turn, the
bushing (not shown) which receives pivot pin 121 is contacted by
the bottom surface of the back support arm on each side of the seat
to register the back 125 in position for occupancy.
Back 125 has a back sheath 151 secured to a rigid frame 152 which
is fastened to the vertical support arms 128 and the transverse
portion 129 of the back support.
As seen in FIG. 9, the backrest and the seat may assume positions
close to the central vertical axis of the chair when the chair is
vacant. Weight bias 119 urges the seat to pivot to the vertical
position of FIG. 9 and the back of the chair may be pushed or
pulled forward to increase the open space between rows of chairs
and facilitate exit from the rows.
A modified folding chair 161 in accordance with the invention is
illustrated in sectional elevation in FIG. 10. The chair has a back
162 similar to the back described with respect to the chair of FIG.
1. The chair has two spaced side members such as the side member
164, each comprising a front vertical brace 165 and a rear vertical
brace 166. The vertical braces of each side member terminate in a
canted attachment plate 167 shown fixed to a sloping riser surface
168 of a stadium row.
A pivot support plate 171 is fixed between the vertical braces of
each side member. A pivot bushing 172 extends inwardly from each
plate toward the seat. An elongate support arm 173 extends
downwardly from each side frame portion of chair seat frame 175.
The seat frame is covered by a seat sheath 176 and is rearwardly
weighted by a bias wedge 177 fixed transversely of the frame.
A pivot pin 179 removably secured in arm 173 extends into the pivot
bushing 172 on each side of the seat. Each arm has a forward
surface 181. The surface registers against the inner face 182 of a
tubular registry bar 183 which extends between the front vertical
braces of the spaced side members. With the seat in occupied
position as in FIG. 10 the surface 181 registers against lower face
184 of the bar 183 and maintains the seat in sitting position
against the bias of wedge 177. A stop surface 815 on that portion
of the support arm 173 remote from the seat frame contacts the
registry bar when the chair is vacant, as the seat pivots about
pivots 179 to a position more proximate the central vertical axis
of the chair.
Registry stops for both seat positions are also present in the
embodiment of FIG. 11. A chair 190 is shown fragmentarily in
section. The chair is a pedestal type, with a sleeve 192 supporting
a horizontal attachment plate 193 to which transversely extending
bottom portions 195, 196 of vertical braces 197, 198 respectively,
are fixed. The braces define a side member 199 of which the chair
has a pair.
Front brace 197 of each member bends horizontally in a back support
201 which extends rearwardly to support a chair back (not shown) in
the fashion of previously described embodiments. In addition to the
back, a front bar 203 is fixed to the front brace of each side
member to stabilize the chair.
A chair seat 205 is pivotally supported between the side members.
The seat has an angle frame 206 with a rear biasing weight 207. A
seat sheath 208 is secured to the frame in convenient fashion, as
by fasteners 209 passing through sheath skirt 211 into the
frame.
A pair of support arms like arm 213 extend from the frame at each
side of the seat. Each arm terminates in a contact flange 214. Each
flange contacts a stop or limit bracket 216 which has arcuately
spaced stop edges 217, 218. When the seat is occupied the flanges
214 register against surface edges 217, holding the seat in the
occupied position of FIG. 11 against the bias of weight 207. When
the seat is vacant the seat pivots in response to the weight bias
into a vertical position limited by stop edge 218 against which
flange 214 registers.
Each stop bracket 216 is supported from a side member by a pivot
bushing 221 mounted on a pivot support 222 fixed to each of the
vertical braces 197, 198. Each bushing extends toward the seat from
the side member, as seen in FIG. 12. The pivot support also holds a
pivot bushing 221A of the adjacent seat assembly.
A pivot pin 225 is journaled in each pivot bushing and threadably
secured removably in each pivot arm 213. The pivot bushing has an
inner bushing or bearing 227, preferably of graphite-impregnated
nylon or teflon, although other self-lubricating bushings may be
used. While a cylindrical bushing is illustrated, other bushing
configurations for particular installation purposes may be
utilized, such as the previously mentioned barrel and cone
configurations.
The pivot pin 225 has a head 229, a threaded portion 231 and a
reduced diameter shank 232. The shank fits into the inner bushing
and supports the seat pivotally.
The axial length of both the bushing and the pivot pin may be such
that spacing between side members of chairs may vary and still need
only one size of bushing and pin. By changing the position of the
bushing or the support arm on the seat, the weight biasing the seat
to fold may be lessened. The attitude of the seat in folded or
seating position may be adjusted by altering the stop or registry
bar positions. Seats and backs, whether of wood, metal or plastic,
may be upholstered for greater comfort and indoor use.
* * * * *