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Патент USA US3088186

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May '-7, 1963
G. A. DELF ET AL
3,088,176
FOLDING BLEACHER
ATTORNEYS
May 7, 1963
G. A. DELF ETAL
3,088,176
FOLDING BLEAGHER
Filed May 5, 1960
A
`
2 Sheets-Sheet 2
73
0
FIGA.
INVENTORS
C-:EORGE A. DîLF'
ROBERT E. KQRTUM
BYCOMM'PMMQQ
ATTORNEYS
United States Patent Óíi?ce
3,088,176
Patented May 7„ 1963
2
ma
mined by a closed or lowered position of the hinged seat
3,083,176
FOLDING BLEACHER
apron on the lowest seat «frame when such lowest seat
frame is fully retracted relative to the tallest frame, there
by precluding unintentional extension of any seat frame.
An important object is to provide a seating structure
that is simple and durable in construction, economical to
manufacture, eflicient in operation, and which can be
'
George A. Delf, St. Louis, and Robert E. Kortum, Robert
son, Mo., assâguors to Narragansett Gymnasium Equip
ment Company, St. Louis, Mo., a corporation of
Missouri
Filed May 5, 1950, Ser. No. 27,053
9 Ciaims. (Cl. Ztl-1.126)
readily manipulated between extended and retracted posi
tions by anyone.
The foregoing and numerous other `objects and vadvan
This invention relates generally to improvements in seat 10
tages of the invention will more clearly appear from the
ing structures, and more particularly to improvements in
following detailed description of a preferred embodiment,
the construction and operation of bleacher seats `of `the
particularly when considered in connection with the ac
retractile or foldable type especially adapted for use in
companying drawings, in which:
gymnasiums, auditoriums and the like.
FIG. 1 is a side elevational View of the seating structure
Various types of folding bleacher structures have here 15
when disposed in a fully retracted position;
-tofore been proposed for use -in gymnasiums, arenas and
FIG. 2 is a side elevational view Vof the seating structure
similar places where it is desirable to conserve floor space
with the lowest seating frame partially extended;
at times while utilizing maximum seating capacity at other
times. Although some of the folding `or telescopic
bleacher assemblages heretofore proposed have enjoyed
a fair degree of commercial success, considerable dif
ficulty has lbeen encountered in providing unitary struc
-tures which are adapted to be folded or telescoped in a
simple manner by a single individual without need for
special equipment, and which form a neat land compact,
substantially enclosed un-it when not in use.
It is an important object of the present invention to
FIG. 3 is a side elevational View of the seating structure
20
fully extended, and
FIG. 4 is a rear elevational view of the seating struc
ture when retracted.
Referring now by characters of reference -to the draw
ings, and íirst to FIGS. l-3 inclusive, it is seen that the
seating structure includes a plurality of successive trans
verse frames indicated at 1t), 11 and 12 of gradually
decreasing heights. In the embodiment disclosed, there
are a total of three frames, but it will be readily apparent
provide yan improved retractable bleacher assembly which
that any suitable number may be utilized depending upon
obviates all of the previously mentioned disadvantages
30 preference and field of usage. The frames 11 and 12 con
heretofore attendant devices of this general type.
structed so that they can be selectively nested below and
An important objective is to provide an improved
within each adjacent taller frame as is illustrated in FIG.
unitary bleacher structure having a series of intercon
l or be selectively extended as is shown in FIG. 3.
nected -seating rows comfortably spaced and `arranged in
The tallest frame 16 includes a plurality lof laterally
tiers when extended, and adapted to be quickly and easily 35
telescoped or folded to compact nested -arrangement with
a lminimum of eñort when desired.
Another important objective is achieved by the provi
sion of improved latching mechanism interconnecting `the
spaced base members 13 -that normally seat on a sub
jacent surface such as -a floor. Usually, lthe tallest seating
frame 10 is located with its rear against a vertical Wall
and the base members 13 extend forwardly therefrom.
telescopically rel-ated seat frames which positively locks 40 A plurality of vertically extending posts 14 are attached
to and carried by base members 13. Attached lto the
the frames in extended position, and which selectively
posts 14 is a forwardly extending horizontal support 15.
unlocks the frames to permit sequential retraction.
Mounted on the top of posts 14 and extending transversely
Other important advantages Iare realized in that the
of the frame 1t) is a seat 16 formed by a long plank.
latching mechanism is conditioned to enable retraction
of the extended frames upon raising ya hinged seat apron 45 Depending from the front edge of top seat 16 -is a seat
apron 17 extending transversely of the frame 10.
on the lowest frame, and the latch interconnecting each
The tallest frame 1t) is provided with an inverted
adjacent pair of frames is unlocked -automatically upon
U-shaped channel 26 that is fixed to the front -of support
retraction, while lowering the apron allows locking of
Still another important object is achieved by providing
a toggle interconnecting adjacent 'se-ating frames which
15 Vand extends transversely of frame 10 along the top
of such support 1S. This channel 20 provides a mounting
for the longitudinal seat 21 and its depending yapron 22.
actuates a latch between its taller associated frame and
For reasons which will later appear, one flange 23 of
Asequential operation.
channel 2@ extends downwardly below the horizontal
lsupport 1S fora short distance.
Yet another important objective is realized by provid 55 A panel 24 formed by a longitudinal channel is `se
cured vto posts 14 and extends transversely of frame 10.
ing a lever pivotally mounted on the lowest seating frame,
the next taller adjacent frame »incident to movement of
its lower associated frame.
one end of which engages a hinged seat rapron -and the
The panel 24 extends substantially from the bottom edge
of seat apron 17 downwardly to the region just `above
other end being connected operatively to a latch mecha
support 15. The panel 24 cooperates with seat apron 17
nism between the lowest frame and the next taller frame.
Upon lifting the seat apron, the lever acts to unlock the 60 to provide a rear closure.
In addition, ya foot rest 25 formed by lan elongate plank
latch when the frames are extended and hence enables
is mounted on the forwardly extend-ing horizontal support
retraction, while lowering the apron allows locking of
15 and is located between the rear panel 24 and the front
the latch when the frames are moved to their extended
seat 21.
arrangement.
The middle frame 11 is constructed somewhat similarly
Another important object is afforded by providing a 65
spring connected »to the lever which tends to urge the
lever in a direction to cause unlocking of the latch be
tween the lowest seating frame and the next taller frame
automatically upon lifting of the hinged seat apron.
to the tallest frame 10 except that it only has a forward
seat portion and is constructed of 1a height so that «it fits
under the horizontal `support 15 of such taller frame 10.
More particularly, the middle frame 11 lincludes a plural
Still another important advantages are realized by
providing a stationary stop that is adapted to engage the
lever when the lever is disposed in a position as deter
rollers 27. The base members 26 ‘are slid-ably related to
ity Vof laterally spaced base members 26 mounted on
the adjacent base members 13 of the highest frame 10
3,088,176
3
and are located inwardly thereof. The rollers 27 enable
the middle iframe 11 to ‘be easily land quickly extended or
retracted relative yto the adjacent taller frame 10.
Similar to the above structure described with respect
to the taller frame 10, the middle frame 11 includes a plu
rality of upstanding posts 35 mounted on base members
26. As explained previously, the posts 30 extend upward
4
57 to posts 42 for vertical reciprocating movement with
in limits upon oscillating movement of lever 53.
A plate 4'60 is attached to posts 42 behind the panel 51
and extends upwardly above and behind the lower de
pending margin of channel ñange 35 to provide an abut
ment 61. Upon extending the lowest seating frame 12
relative to the next taller trarne 11, the abutment 61 en
gages the channel flange 35 and limits such extension, and
in addition, transmits the outward pulling force to the
ly to a point just below the horizontal support 15 of the
taller frame 10 to enable the middle frame 11 to be tele
scoped within. The middle frame 11 includes a forward 10 frame 11 to cause extension of such frame 11 relative to
the tallest frame 10.
ly extending horizontal support 31 attached to and carried
Cooperating with the -abutment 61 is a latch 62 that
by the posts 30. Annother inverted U-shaped channel
is pivotally connected to the horizontal support 31 of the
32 is secured to the upper front portion of horizontal sup
next taller frame 11. When in the relatively extended
port 31 and provides a mounting for a transverse seat
33 and its depending front Áapron 34. Again, it will be 15 position of the adjacent pair of frames 11 and 12, the latch
62 rests on top of actuating rod 56 and engages the abut
noted that the front ñange 35 of channel 32 extends down
ment 61 to preclude relative retraction. When so latched,
wardly below the horizontal support 31 to provide a
the rod 56 is in its lowermost position `as determined by
shoulder the purpose of which will be explained subse
the particular disposition of lever 53 when the hinged
A panel 36 extends transversely of middle frame 11 and 20 apron 47 is in its closed position, as is best illustrated in
FIG. 3.
is secured to the posts 3i), the panel 36 extending up
A tension spring 63 constituting a reselient means is
wardly from the support 31 substantially to the bottom
attached to the horizontal support 43 and is attached to
margin of seat apron 22 on the taller frame 10 to provide
lever 53, the spring 63 tends to pivot the lever 53 in a
a closure. Attached to the horizontal support 31 is .a
transversely extending foot rest 37 located between the 25 direction to raise rod 56 toward an unlocked position.
Such movement of lever 53 is normally restrained under
panel 36 and the front seat 33.
spring loading by engagement of the hinged seat apron
Of course, the seating structure can be constructed of
47 with the lever end 54.
any number of intermediate seating frames, all of which
To release the l-atching means interconnecting the lowest
will be constructed identically with middle frame 11, but
of successively and gradually decreasing heights to enable 30 frame 12 and the adjacent taller frame 11, and hence
permit relative retraction, the hinged apron 47 is raised
nesting below and within the next adjacent taller frame.
as is illustrated in broken lines in FîG. 3. The lever 53
Only a single intermediate frame 11 is disclosed in this
is thereby released and the spring 63 causes the lever to
embodiment for purposes of illustration and clarity.
raise actuating rod 56 upwardly so that rod 56 lifts the
The lowest seating frame 12 is constructed similar to
the intermediate frame 11 with a few modifications. For 35 latch 62 above the abutment 61. The frames 11 and 12
are now unlocked> and can be relatively retracted by roll
example, the lowest frame 12 includes a plurality of base
ing the lowest frame 12 inwardly below the next taller
members 40 slidably related to and located with the base
frame 11.
members 26 of the adjacent taller frame 11. Again, the
The locking mechanism interconnecting the next ad
base members 40 include a plurality of rollers 41 to facili
jacent pair of frames 10 and 11 includes a latch ’64
tate extending and retracting the frame 12. A plurality of
quently.
vertical posts 42 are carried by the rear of base members
pivoted to the forwardly extending horizontal support
15. A plate 65 is secured to vertical posts 30 behind
the panel 36, the plate 65 including an abutment 66 that
is adapted to engage the depending lower margin of chan
the support 43 being attached to upwardly extending posts 45 nel ñange 23 to limit relative extension of frames 10 and
11, and which is adapted to engage the latch 64 when
44 attached to the front of base members 40.
the frames 10 and 11 are extended so as to preclude rela
An langle plate 45 is attached to the horizontal sup
tive retraction. An actuating rod 67 constituting operat
port 43 and is attached to the top of the front posts 44,
ing means is slidably mounted by pins 68 to the posts
the angle plate 45 providing a mounting for a transverse
30 for reciprocating movement within limits.
seat 46.
When the frames 10 and 11 are relatively extended,
Hingedly connected to the front margin of seat 46 is
40,- the posts 42 terminating just below the horizontal
support 31 of the next adjacent taller frame 11. Extend
ing forwardly from posts 42 is a horizontal support 43,
the latch ‘64 rests on top of actuating rod 67 and engages
a depending front apron 47. The apron 47 is movable
the abutment 66 to prevent relative retraction. The rod
within limits from the closed position shown in full lines
67 is lowered to one limit as is illustrated in FIG. 3 by
in FIG. 3 to the raised position illustrated in broken
lines. When in the closed position, the seat apron 47 55 gravity to retain the latch 64 .as described.
A toggle 70 consisting of pivotally interconnected arms
can be selectively retained in such position by a lock 50.
71 and 72 is located at opposite sides of the frame 11.V
The lowest seating frame 12 includes .a panel 51 formed
The toggles 70 are interconnected by transverse equalizing
by a channel which is attached to and extends between
bars 73 and 74, bar 73 interconnecting the toggle arms 71
the rear posts 42. The panel 51 extends upwardly from
the horizontal support 43'to the lower margin of seat apron 60 and bar 74 interconnecting toggle arms 72. The toggle
arm 71 is pivotally connected to the rear vertical posts 42
34 on the adjacent taller frame 11. A foot rest 52 is
of the lowermost frame 12 while the other toggle arm
secured to the horizontal support 43 and is located be
72 is pivotally connected to the horizontal support 31 of
tween the panel 51 and the front seat 46.
the next taller frame 11.
The latching mechanism between the lowest frame 12
Upon release of latch 62 and subsequent retraction of
and the next taller frame 11 includes identical mechanism 65 -lower-most frame 12 relative to the next adjacent taller
at each side of the seating structure. A detailed descrip
frame 11, the toggle 70 at each side of the seating struc
tionv of the mechanism at one side will suñ‘ice for the
ture rotates to engage the actuating rod 67. More par
other.
'
ticularly, the toggle arm 72 moves upwardly to engage
This latching mechanism includes av lever 53 pivotally 70 the lower end of yrod 67 and operates to raise the rod 67
mounted to the front posts 44. One end 54 of lever 53
to lift latch 64 out of the path of abutment 66. This un
engages the back side of seat apron 47 when the apron
latching operation occurs substantially upon complete re
47 is in its closed position. The other end 55 of lever
traction of the lowermost frame 12 within the next taller
53 is attached to an actuating rod 56 constituting an op
frame 11, and hence conditions the frame 11 for retrac
erating means. The rod 56 is slidably mounted by pins 75 tion within the next taller frame 10. It is seen that this
3,088,176
5
-mechanism .provides for sequential retraction of the seat
ing frames.
A pair of toggles 75 operatively interconnects the ad
jacent frames 10 and 11, one of the toggles 75 being lo
6
and hingedly raised. The lever 53 is pivoted under the
loading of spring 63 to lift the actuating rod 56, and
hence lift the latch 62 above the abutment 61. The
lowest frame 12 can then be relatively retracted within the
next taller frame 11. When frame 12 is fully retracted
within the adjacent frame 11, the toggle 70 engages the
actuating rod 67 to lift the l-atch 64 above the abutment
cated at each side of the seating structure. Each toggle
75 includes pivotally interconnected arms 76 and 77.
Toggle arm 76 is pivotally connected to the horizontal
66. Then, the frames 11 and 12 as a unit may be re
support 15 of the tallest frame 10 while the other toggle
tracted relative to the adjacent taller frame 10. When
arm 77 is pivotally connected to the posts 30 of the next
lower frame 11. Equalizing bars 80 and 81 extend trans 10 fully retracted, the hinged apron 47 is closed so that the
lever arm 83 tits behind the angle plate 82 to lock the
versely between and interconnect the toggles 75 at op
frames in the retracted position. ‘1f desired, the hinged
posite sides of the seating structure. More particularly,
apron 47 can be retained in closed position by lock 50.
bar 80 operatively interconnects toggle arms 76 while bar
It is seen that the particular structure causes sequential
81 operatively interconnects arms 77.
lt is an important function of the equalizing bars 73 15 operation of the interconnected seating frames upon be
ing either extended or retracted. Furthermore, it is seen
and 74 interconnecting toggles 70 and of equalizing bars
that operation of the frames is controlled by a hinged seat
80 and 81 interconnecting toggles 75 to transmit equal
apron 47 on the lowest frame 12 and that movement of
forces to the opposite sides of the frames when being re
each frame conditions the next taller frame for either re
tracted or extended, thus assuring that the frames will
move in a straight path without any binding action there 20 traction or extension.
between, such as would occur if the frames could be
Although the invention has been described by making
detailed reference to `a single preferred embodiment, such
detail is to be understood in an instructive, rather than in
Lock means is provided to retain the frames in their
any restrictive sense, many variants being possible with
fully retracted position as is illustrated in FIG. l. An
angle plate 82 constituting a fixed stop is secured to the 25 in the scope of the claims hereunto appended.
We claim as our invention:
door immediately below lever 53. An arm 83 is attached
l. In a seating structure, a plurality of transverse
to lever 53 and extends downwardly to interiit behind
frames of decreasing heights, the lower frame being re
angle plate 32 when the lever 53 is pivoted upon closing
tractable toward or extensible from the next taller frame,
the front seat apron 47. This action locks all of the
frames in the retracted position. To release the frames, 30 an abutment on the lower frame, a latch movably
mounted to the next taller frame and engaging the abut
the hinged front apron 47 is raised and the lever 53` is
cocked laterally.
ment when the frames are extended to preclude retr-ac
tion, a lever pivoted to said lower frame, means hinged
63 so that lever arm 83 is raised above the angle plate 82.
to the lower frame and engaging one end of said lever,
The lowest frame 12 can then be extended relative to the
35 and an operating means operatively connected to the
next taller frame 11.
other end of said lever and mounted on said lower frame
It is thought that the operation and functional advan
automatically pivoted under the loading of tension spring
for movement within limits, the said latch being dis
tages of the seating structure have become fully apparent
posed in the path of said abutment to preclude retraction
from the foregoing detailed description of parts, but for
of said frames with the operating means in one limit, the
completeness of disclosure the extension and retraction of
the frames will be brieñy described. It will be assumed 40 operating means in another limit holding the said latch
out of such path to enable retraction, said lever moving
that the frames are relatively retracted and locked in such
the operating means to said limits in response to move
position, as is illustrated `in FIG. 1, `and that it is desired
ment of said hinged means.
to extend the frames to provide an operative seating
structure.
2. ln a seating structure, a plurality of transverse
First, the lock 50 is unlocked to release the hinged 45 trames of decreasing heights, the lower -frame being re
tractable toward or extensible «from the next taller frame,
front apron 47. Upon lifting of seat apron 47, as illus
an abutment on the lower frame, a latch movably mounted
trated in FIG. 2, the lever 53 is moved pivotally by
to the next taller frame and engaging the abutment when
spring 63 so that lock arm 83 clears angle plate 82 and
the frames are extended, a lever pivoted to said lower
so that actuating rod 56 raises latch 62 to clear the abut
ment 61. The frame 12 can then be relatively extended 50 iframe, an actuating rod connected to one end »of said lever
and slidably mounted on said lower 'frame for movement
with respect to the next taller trame 11.
within limits, the latch being disposed in the path of said
As the lowest frame 12 is extended, the latch 62 rides
abutment to preclude retraction of said frames with the
over the abutment 61 and drops down upon actuating
actuating rod in one limit, the rod in another limit hold
rod 56, the rod 56 being `lowered by hingedly closing the
seat apron 47. In this position, the latch 62 engages the 55 ing the latch out of such path to enable retraction, an
apron hinged to said lower frame and engaging the other
abutment 61 to preclude relative retraction of frames 11
end of said lever, resilient means connected to said lever
and 12, and in addition, the abutment 61 engages the
tending to pivot the lever in a direction to move the
lower margin of channel ñange 35 to exert an outward
actuating rod to the said other limit to unlock said latch,
pulling force on the taller frame 11.
As the intermediate frame 11 is extended relative to 60 said hinged apron in one position `moving the lever so
that the said latch is locked, and said apron in another
the next taller frame 10, substantially the same action
position enabling the lever to pivot under loading of said
takes place. lFor example, the latch 64 rides over the
resilient means so that the said latch is unlocked by said
abutment 66 and drops down on top of the actuating rod
actuating rod.
.
67, the rod 67 being lowered .because the toggle 70l has
3. In a seating structure, a plurality of transverse
been moved out of the collapsed position upon relative 65
frames of decreasing heights, the lower frame being re
extension of the frames 11 and 12. Furthermore, the
tractable toward or extensible from the next taller frame,
abutment 66 engages the lower margin of channel flanges
an abutment on one of said frames, a latch movably
23 to determine the fully extended position.
mounted to the next adjacent yframe and engaging the
When the frames 16, 11 `and 12 are fully extended, and
with the hinged seat apron 47 closed, the latches 62 and 70 abutment when the frames are extended, a lever pivoted
to said lower frame, an operating means connected to one
64 preclude unintentional retraction. The hinged seat
end of said lever and mounted on said lower frame for
apron 47 can then be locked in its closed position by
Ámovement within limits, the latch engaging the abutment
lock 50 if desired.
to preclude retraction of said frames with the operating
To retract the seating frames from their fully extended
position, the front seat apron 47 is unlocked by lock 50 75 means in one limit, the operating means in another limit
3,958,476.
disengagingthe latch from the Vabutment to enable retrac
tion, resilient :means connected to said lever Ytending to
'Pivot the lever in adirection to move the operating means
to the said other limit to unlock said latch, an apron
hinged to the
hinged apron
the said latch
tion enabling
lower frame and engaging the lever, said
in one position holding the lever so that
is locked, and said apron in another posi
the llever to pivot under loading of said
resilient means so that the said latch is unlocked by said
operating means, a stop element on said lever, a Íìxed
f_or retraction by unlocking ,the latching means normally
holding said next taller yframe.
Y
7. Aln Áa `seating structure, a plurality of transverse
frames of successive.y decreasing heights, said frames
ybeing retractable inne'stedrelation to the next taller frame
and ‘selectivelyV extensible therefrom, a latch pivotally
mounted to each frameexcept the lowest frame, an abut
ment on each frame except the tallest frame engaging the
latch on the next taller frame when the frames are ex
tended so as to prevent retraction, a seat apron hinged
stop shoulder, the stop element engaging the said stop
to the lowest frame and movable within limits, an actuat
shoulder when the frames are fully retracted and the
-apron is moved to said one position in which the said
ing rod slidably mounted on each frame except the tallest
latch is normally locked so as to prevent extension of
lever operatively interconnecting said hinged apron with
the said actuating rod on the lowest frame for moving the
.said frames.
4. `In a seating structure, a plurality of transverse frames
of successively decreasing heights, said frames being re
tractable in nested relation within and below the next
taller frame and successively extensible therefrom, a latch
movably mounted to each frame except the lowest frame,
an abutment on each frame except the tallest »frame en
gaging the latch on the next taller frame when the frames
are extended so as to prevent retraction, means hinged
to the lowest yframe and movable within limits, means
frame and engaging the latch on the next vtaller frame, a
latch associated with such rod out of locking relation
to the abutment on the lowest «frame upon 4movement of
said hinged apron to one of said limits, and a toggle in
terconnecting each pair of adjacent frames, each toggle
engaging the rod of its taller associated frame to move
,the latch of the next taller frame out of locking relation
to its abutment as its lower associated frame is selectively
retracted, the retraction of each frame conditioning the
next taller frame for retraction by unlocking the latch
operatively interconnecting the said hinged means with 25 normally holding `said next taller frame.
the latch on the next taller frame for moving the said
latch out of locking relation to the abutment on said lower
8. In a seating structure, a plurality of transverse frames
Iframe upon movement of said hinged means to one of
of decreasing heights, each frame including a seat on the
front of said frames, an apron extending downwardly
said limits, a toggle interconnecting each pair of adjacent
from each seat, a panel at the rear of said frames extend
frames, and means engageable by said toggles to move 30 ing :upwardly to the apron of the next taller frame when
said other latches out of locking relation to their asso
the frames are extended, and a foot rest mounted between
the seat and panel, the llower frame being retractable
ciated abutments as the yframes are sequentially retracted,
the retraction of each -frame conditioning the next taller
within and below the taller frame and selectively extensi
frame for retraction yby unlocking the latch normally hold
ble therefrom, a latch movably mounted to each frame
ing said next taller frame.
ka5 except the lowest frame, an abutment on each frame ex
5. In a seating structure, a plurality of transverse frames
cept the tallest »frame engaging the latch on the next taller
of successively decreasing heights, said frames being re
frame when the frames are extended so as to prevent
tractable in nested relation to the next taller frame and
retraction, operating means movably mounted on each
frame except the tallest frame and engaging the latch on
successively extensible therefrom, a latch movably
mounted to each Iframe except the lowest frame, an abut 40 the next taller frame, means hinged to the lowest frame
ment on each frame except the tallest frame engaging
and movable within limits, means .operatively intercon
the latch on the next taller -frame when the frames are
necting said hinged means with the said operating means
extended so as to prevent retraction, operating means
on the lowest frame 'for moving the latch associated with
movably mounted on each frame except the tallest frame
such operating means out of locking relation to the abut
Vand engaging the latch on the next taller frame, means 45 ment on the lowest -frame upon movement of said hinged
hinged to the lowest frame and movable within limits,
means to one of said limits, and a toggle interconnecting
means operatively interconnecting said hinged means
each pair of adjacent lframes, each toggle engaging the
with the said operating means on the lowest -frame for
operating means of its taller associated frame to move
moving the latch associated with such operating means
the latch of the next taller frame out of locking relation
out of locking relation to the abutment `on the lowest
frame upon :movement of said hinged means to one of
.said limits, and a toggle interconnecting each pair of ad
jacent frames, each toggle engaging the operating means
to its abutment as the toggle’s lower associated frame is
selectively retracted, the retraction of each _frame condi
tioning the next taller frame yfor retraction -by unlocking
the latch normally holding the said next taller frame.
:of its taller asociated Iframe to move the latch of the
9. In a seating structure, a plurality of transverse frames
next ta-ller frame out of locking relation to its associated 55 of decreasing heights, each frame including a seat on the
:abutment as its lower associated frame is selectively re
front of said frames, an apron extending downwardly
'.tracted, the retraction of each -frame conditioning the
from each seat, a panel at the rear of said frames extend
:next taller frame for retraction by unlocking the latch nor
ing upwardly to the apron of the next taller frame when
mally holding said next taller frame.
the yframes are extended, and a foot rest mounted between
6. In a seating structure, a plurality of transverse frames 60 the seat and panel, the lower frame being retractable
fof successively decreasing heights, each said frame being
within and below the taller frame and selectively exten
:retractable in nested relation to the next taller frame and
sible therefrom, a latch movably mounted to each frame
:selectively extensible therefrom, latching means inter
connecting each adjacent pair of frames when the frames
except the lowest frame, an abutment on each frame ex
cept the tallest frame engaging the latch on the next
:are extended so as to prevent retraction, means hinged 65 taller frame when the frames are extended so as to pre
to the lowest frame and movable within limits, means
operatively interconnecting said hinged means with the
said latching means interconnecting the lower pair of
adjacent frames yfor unlocking such latching means upon
vent retraction, a shoulder on each frame except the low
est frame engaging the abutment of the next taller frame
when the lower frame is extended so as to enable exten
sion of the said next taller frame, an actuating rod slid
movement of said hinged means to one of said limits, a 70 ably mounted -for reciprocation on each frame except the
toggle interconnecting each adjacent pair of -fra-mes, and
other latching means as the frames are retracted, the
tallest frame and engaging the latch on the next taller
frame, a lever pivoted to the lowest frame, the apron on
the lowest frame being hinged and engaging one end of
said lever, the actuating rod on the lowest yframe being
retraction of >each frame conditioning the next taller frame
operatively connected to the other end of said lever, said
means associated with each other latching means and
lselectively engageable by said toggles for unlocking said
3,088,176
lever moving the latch associated with the 4last said rod
out of locking relation to the abutment on the lowest
`frame upon movement of said hinged apron, a spring con
nected to said lever tending to pivot the lever in a direc
tion to move the last said rod to one limit to unlock said 5
latch, and a toggle interconnecting each pair of adjacent
frames, each toggle engaging the actuating rod of its
associated taller frame to move the latch of the next
taller frame out of locking relation as its associated lower
frame is selectively retracted.
10
References Cited in the ñle of this patent
UNITED STATES PATENTS
2,815,541
Lappin ______ _______ __ Dec. 10, 1957
OTHER REFERENCES
Safway Spectator Seating, pp. 4 and 5, catalog No.
GS-657 of Safway Steel Products, Inc., Milwaukee 13,
Wis.
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