U.S. patent number 3,630,309 [Application Number 04/831,917] was granted by the patent office on 1971-12-28 for portable shell.
This patent grant is currently assigned to Wenger Corporation. Invention is credited to Daryl D. Douglas, Erich Harfmann, Jerry A. Wenger.
United States Patent |
3,630,309 |
Wenger , et al. |
December 28, 1971 |
PORTABLE SHELL
Abstract
A portable acoustical shell structure arranged for reflecting
sound. The shell structure arranged for reflecting sound. The shell
structure is freestanding and is portably carried on a base which
may be provided with suitable casters. The shell structure
comprises a plurality of panels which are selectively disposed in
an extended sound-reflecting arrangement or in different storage
arrangements as desired. The panels are movably connected to the
frame of the structure for facilitated rearrangement. The uppermost
panel is adjustably mounted for controlling height of the shell
structures and direction of projection of the sound. A plurality of
the shell structures may be used in side-by-side arrangement to
define sound-reflecting walls, or shells, such as choral and
symphonic shells.
Inventors: |
Wenger; Jerry A. (Owatonna,
MN), Douglas; Daryl D. (Owatonna, MN), Harfmann;
Erich (Owatonna, MN) |
Assignee: |
Wenger Corporation
(N/A)
|
Family
ID: |
25260199 |
Appl.
No.: |
04/831,917 |
Filed: |
June 10, 1969 |
Current U.S.
Class: |
181/30; 160/351;
160/135 |
Current CPC
Class: |
E04B
1/8236 (20130101) |
Current International
Class: |
E04B
1/82 (20060101); E04b 001/99 () |
Field of
Search: |
;181/30,33,33.12
;160/135,231,231R,351 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Ward, Jr.; Robert S.
Claims
We claim:
1. A portable acoustical shell structure comprising: panel means
having a planar upright lowermost portion and a planar forwardly
inclined uppermost portion; a framework carrying said panel means
to define an upright sound-reflecting surface; and base structure
extending substantially only rearwardly of said surface and
provided with wheel means for movably carrying said framework, said
wheel means including front wheels disposed subjacent said
lowermost panel means portion.
2. The portable acoustical shell structure of claim 1 wherein said
base structure includes a rear crosspiece comprising counterweight
means and means removably securing said counterweight means in said
base structure for stabilizing the rear of the base structure and
concurrently counterbalancing the shell structure.
3. The portable acoustical shell structure of claim 1 wherein said
base structure is forwardly open and narrows rearwardly.
4. The portable acoustical shell structure of claim 1 wherein said
panel means includes a forwardly inclined bottom section extending
to forwardly of said base structure whereby said base structure is
effectively hidden from view from forwardly of said surface by said
bottom section.
5. The portable acoustical shell structure of claim 1 wherein said
base structure defines a forwardly opening trapezoidal
configuration adapted to nest with the base structure of a second
of said shell structures.
6. In an acoustical shell structure: support means having a
forwardly open, rearwardly closed bottom portion, panel means
carried by said support means including means defining an upright
sound-reflecting front surface spaced above the bottom of said
support means, and a kicker panel hingedly connected to said panel
means for selectively extending downwardly of said panel means to
the level of and forwardly of the bottom of said forwardly open
support means selectively positionable to close the opening thereof
during use and expose the opening thereof for nested storage of a
second such shell structure therewith.
7. The acoustical shell structure of claim 6 including means
hingedly connecting said kicker panel to the lowermost portion of
said panel means and means carried on said base for causing the
kicker panel to be forwardly tilted in the downwardly extending
arrangement.
8. The acoustical shell structure of claim 6 further including
retaining means for releasably securing said kicker panel in an
upper storage position spaced above the bottom of said support
means.
9. The acoustical shell structure of claim 6 wherein said kicker
panel is opaque and effectively hides the lower portion of said
support means below said panel means from view from forwardly of
said surface.
10. In an acoustical shell structure: support means provided with
front and rear wheels for movably carrying the shell structure,
panel means carried by said support means including means defining
an upright sound-reflecting front surface, a canopy panel, and
means for adjustably positioning said canopy panel upwardly of said
panel means including adjustable articulated arm means connected
between said canopy panel and a portion of said support means
rearwardly of a vertical plane defined by said front wheels.
11. The acoustical shell structure of claim 10 wherein said arm
means includes threaded means for threadedly adjusting the
arrangement of the arm, said threaded means being disposed fully
rearwardly of said vertical plane.
12. The acoustical shell structure of claim 11 wherein said
threaded means comprises turnbuckle means for providing the
adjustability thereof.
13. The acoustical shell structure of claim 10 wherein said support
means and arm means are provided with cooperating detachable pin
and connector means for connecting the arm means to the support
means.
14. In an acoustical shell structure having support means, panel
means carried by said support means including a first panel fixedly
secured to the support means and defining an upright
sound-reflecting front surface, second and third panels, and means
movably mounting said second and third panels to said support means
for selective disposition in a storage position rearwardly of said
first panel and a sound-reflecting position of said second panel in
coplanar edgewise alignment with said first panel and said third
panel in angular relationship to said second panel in edgewise
alignment therewith, said second and third panels cooperatively
defining a sound-reflecting front surface in said sound-reflecting
position effectively comprising a turned continuation of the
sound-reflecting surface of said first panel.
15. The acoustical shell structure of claim 14 wherein said
mounting means comprises hinge means swingably mounting said second
panel on said support means and said third panel on said second
panel.
16. The acoustical shell structure of claim 14 further including a
fourth panel, said mounting means being arranged to dispose said
third and fourth panels at an angle to said first panel in said
sound-reflecting position.
17. A portable acoustical shell structure comprising:
an upright frame;
a first sound-reflecting panel fixed to said frame;
a second sound-reflecting panel;
means movably mounting said second panel in said shell structure
for selective disposition in a storage position facially adjacent
said first panel and a sound-reflecting position in edgewise
adjacency to said first panel;
a canopy panel;
means movably mounting said canopy panel in said shell structure
for selective disposition in a storage position facially adjacent
said second panel and a sound-reflecting position in edgewise
adjacency to said second panel; and
a base extending substantially only rearwardly of said first panel,
said base narrowing rearwardly to nest with a similar base of a
second similar acoustical shell structure.
18. The portable acoustical shell structure of claim 17 wherein
said first panel is spaced above the base to permit facilitated
longitudinal relative movement of said base into the nested
relationship.
19. The portable acoustical shell structure of claim 17 wherein
said second panel is disposed rearwardly of said first panel and
said canopy panel is disposed rearwardly of said second panel, said
panels being in facial juxtaposition in the storage position, the
first panel of said second shell structure being rearwardly
facially juxtaposed to the canopy panel of the first shell
structure in the nested storage arrangement.
20. The portable acoustical shell structure of claim 17 wherein
said second panel is hingedly mounted on said frame.
21. The portable acoustical shell structure of claim 17 wherein
said canopy panel is hingedly mounted on said second panel.
22. The portable acoustical shell structure of claim 17 wherein
said second panel is disposed rearwardly of said first panel and
said canopy panel is disposed rearwardly of said second panel, said
panels being in facial juxtaposition in the storage position, the
thickness of said juxtaposed first, second, and canopy panels in
the storage position being less than one-third the fore-and-aft
dimension of said base.
23. The portable acoustical shell structure of claim 17 wherein the
shell structure has a length less than 6 feet 6 inches and a
fore-and-aft dimension of less than 3 feet when the panels are in
said storage position whereby said shell structure may be moved
freely through a conventional doorway.
24. The portable acoustical shell structure of claim 17 wherein
said shell structure may be arranged with said first and second
panels in edgewise adjacency and said canopy panel facially
adjacent said second panel in a partial storage arrangement of the
shell structure.
25. The portable acoustical shell structure of claim 17 wherein a
counterweight is provided on the base having a weight and spacing
rearwardly of the frame preselected to counterbalance the panel
arrangement with the canopy panel extending angularly upwardly from
an upper portion of said first sound-reflecting panel.
26. The portable acoustical shell structure of claim 17 wherein
said first panel is spaced above the base and said shell structure
further includes a counterweight in the base and a kicker panel
selectively movable to extend downwardly from said first panel to
the level of the bottom of said base in a sound-reflecting
position, and upwardly from the bottom of said first panel in a
retracted position permitting nesting of said bases.
27. A portable acoustical shell structure comprising: an upright
frame; a first sound-reflecting panel fixed to said frame; a second
sound-reflecting panel; means movably mounting said second panel in
said shell structure for selective disposition in a storage
position facially adjacent said first panel and a sound-reflecting
position in edgewise adjacency to the upper edge of said first
panel; a canopy panel; a kicker panel; and means movably mounting
said canopy panel in said shell structure for selective disposition
in a storage position facially adjacent said second panel and a
sound-reflecting position in edgewise adjacency to the upper edge
of said second panel, and movably mounting said kicker panel in
said shell structure for selected disposition in a storage position
facially adjacent said first panel and a sound-reflecting position
in edgewise adjacency to the lower edge of said first panel.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to acoustical reflectors and in particular
to reflectors for use as shells, such as choral or symphonic
shells.
2. Description of the Prior Art
In the conventional music shell, bandstand, or stage provided for
performances of orchestras, smaller musical ensembles, choruses,
choirs, dramatic groups, etc., wall structures have been built in
to provide reflection of the sound from rearwardly and from the
sides of the performers. Such built-in reflecting means have had
the serious disadvantage of limitation or adaptability of different
size groups. Further, it is desirable at times to conduct such
performances in rooms and spaces which are not normally used for
such performances.
Further, it is conventional for many performers to travel from
place to place. Often the facilities for the performances do not
include satisfactory sound-reflecting means. Thus, there has
developed a need for a low-cost portable acoustical shell structure
which may be arranged when desired to provide the desirable
reflection of the sound produced by the performers.
An improved portable sound shell providing a highly desirable
portable sound-reflecting means has been recently developed as
disclosed and claimed in H. J. Wenger's U.S. Pat. No. 3,180,446
issued Apr. 27, 1965 for a "Portable Sound Shell." In said patent,
a portable sound-projecting shell structure is disclosed which is
adapted to provide desirable sound reflection functioning as
discussed above. Sound reflector shell units made in conformity
with said patent are manufactured and sold by the assignee hereof.
Such units have found wide acceptance in the performing arts
field.
SUMMARY OF THE INVENTION
The present invention comprehends an improved portable acoustical
shell structure providing additional highly desirable features over
and above those found in the portable sound shell disclosed in said
Wenger letters patent.
Thus, the present invention comprehends an improved portable
acoustical shell structure having an improved base structure
extending substantially only rearwardly of the upright panel
portion for improved convenience in providing a portable
sound-reflecting means closely adjacent the rear of a performance
area. The base may be provided with suitable counterweights to
stabilize the shell structure and facilitate handling thereof.
The invention further comprehends an improved acoustical shell
structure having a kicker panel movably associated with the upright
panel means for selectively extending downwardly completely to the
floor to provide a complete sound-reflecting surface from the floor
to the top of the shell structure.
The invention still further comprehends the provision of a new and
improved acoustical shell structure having new and improved means
for adjustably positioning the canopy panel at the upper portion of
the sound-reflecting surface. The positioning means includes
adjustable arm means connected between the canopy panel and the
frame support means of the shell structure thereby providing
improved positive retention of the canopy panel in the adjusted
position.
Yet further the invention comprehends the provision of such a
portable acoustical shell structure having new and improved panel
mounting means wherein a first panel is fixedly secured to the
framework support means and a second panel is movably mounted on
the support means for selective disposition in a storage position
rearwardly of the first panel and a sound-reflecting position in
edgewise alignment with the first panel.
The acoustical shell structure is arranged to fold into a compact
storage arrangement having relatively small width and height so as
to permit the shell structure to be easily moved through standard
doorways such as to other performing or storage areas. The base
comprises an integral portion of the shell structure and may be
provided with suitable casters so that the shell structure may
define a self-contained trucking arrangement for facilitated
movement both in positioning the shell structure in erection and in
moving the shell structure to the other performing or storage
areas.
Still further, the portable acoustical shell structure of the
present invention is arranged to have facilitated nesting with
similar acoustical shell structures so that minimum storage space
is required for maintaining substantial numbers of the shell
structures.
BRIEF DESCRIPTION OF THE DRAWING
Other features and advantages of the invention will be apparent
from the following description taken in connection with the
accompanying drawings wherein:
FIG. 1 is a front elevation of a shell formed of a plurality of
portable acoustical shell structures embodying the invention;
FIG. 2 is a rear perspective view of a shell structure embodying
the invention in a storage arrangement;
FIG. 3 is a fragmentary side elevation thereof with the panel means
in a partially erected arrangement shown in dotted lines;
FIG. 4 is a rear elevation thereof;
FIG. 5 is a fragmentary side elevation with the panels arranged in
the sound-reflecting erected arrangement;
FIG. 6 is a rear perspective view thereof;
FIG. 7 is a fragmentary enlarged perspective view showing details
of the panel mounting means; and
FIG. 8 is a schematic side elevation showing a plurality of the
shell structures in nested association.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the exemplary embodiment of the invention as disclosed in the
drawing, a portable acoustical shell structure generally designated
10 is shown to comprise a sound-reflecting reflecting panel
structure which may be used in suitable multiples to define a shell
generally designated 11 such as for use in reflecting sound in
connection with the performing arts. Illustratively, the shell may
be used as a choral shell, a symphonic shell, a shell suitable for
reflecting sound with smaller groups such as dramatic groups,
ensembles, etc. As shown in FIG. 1 in the shell arrangement, the
plurality of shell structures 10 are disposed in side-by-side
arrangement to form effectively a portable wall. In the illustrated
embodiment, each shell structure 10 includes a first fixed panel
12, a second movable panel 13, an upper canopy panel 14, and a
kicker panel 15. In the sound-reflecting arrangement, the panels
are arranged in a vertical series in edgewise adjacency with panels
15, 12 and 13 extending substantially vertically upright and canopy
panel 14 adjustably positioned to extend at an angle forwardly from
the top of panel 13. Thus, shell 11 effectively defines an
acoustical freestanding floor unit shell with the arrangement being
adjustable to accommodate different areas and types of performing
arts.
More specifically, as shown in FIG. 2, the shell structure 10
includes an upright frame 16 and a base 17. The base 17 is provided
with suitable wheel means, such as casters 18 for facilitated
movement of the shell structure as desired. The rearmost casters
may be provided with suitable locking brakes 19 to hold the shell
structure in position when desired.
The frame includes a left upright 20 and a right upright 21 secured
as by bolts 22 to suitable gussets 23 on the base 17. The fixed
panel 12 is secured to the uprights 20 and 21 by a pair of fixed
lower panel brackets 24 and a pair of upper lockable panel brackets
25 cooperating with clips 26 and 27 respectively on the uprights as
best seen in FIG. 4. The kicker panel 15 may be retained in an
upper storage position forwardly facially juxtaposed to the fixed
lower panel 12 as by means of suitable clips 28.
Base 17 is provided with a suitable counterweight 29 which may be
bolted to a rear crosspiece comprising a second counterweight 30
thereof as by suitable bolts 31. As shown in FIG. 2, the length of
crosspiece 30 is substantially less than the spacing between
uprights 20 and 21 whereby the sidepieces 32 of the base are angled
inwardly toward the rear thereof. Thus, the base narrows rearwardly
for improved facilitated nesting as will be brought out more fully
hereinafter.
Canopy panel 14 is hingedly secured to second panel 13 by a
suitable hinge 33. The panels may be held together as during
storage by suitable clip 34 at the top thereof, as shown in FIG. 2.
Panel 13 is provided with a pair of hinge connectors 35 which are
secured to the upper ends of the uprights 20 and 21, which as shown
in FIG. 3 permit the assembled canopy panel 14 and panel 13 to be
swung as a unit from a storage position as shown in FIG. 2 to an
upright position as shown in FIG. 6. In the storage position, the
panel 13 is rearwardly facially juxtaposed to panel 12 and canopy
panel 14 is rearwardly facially juxtaposed to panel 13. The total
thickness of the three panels in the storage position shown in FIG.
2 is preferably small, and in the illustrated embodiment, is less
than one-third the fore-and-aft dimensions of base 17. As shown in
FIGS. 2 and 6, panel 14 may be provided with stiffeners 36, panel
13 may be provided with a stiffener 37, panel 12 may be provided
with a stiffener 38, and kicker panel 15 may be provided with a
stiffener 39. As shown in FIG. 6, clips 28 may be retained on
stiffener 38 when not in use and clip 34 may be stored on one of
stiffeners 36 when not in use.
Panel 13 is provided with a pair of upright extensions 40 which are
secured thereto by suitable brackets 41. As shown in FIG. 7, each
of the hinge connectors 35 includes a bracket 42 which is fixedly
secured to the upright extension 40 and a pivot 43 which is secured
to the uprights 20 and 21. The panel 13 is retained in the upright
position, when the bracket 42 is swung from the upside down
position of FIG. 2 to the upright position of FIG. 6, by a locking
pin 44 received in a pair of aligned holes 45 in the bracket 42 and
removably retained therein by suitable spring 46 connected to the
pin. In the upright positions as shown in FIGS. 4 and 6, the lower
edge 47 of panel 13 abuts the upper edge 48 of lower panel 12 with
the panels in edgewise juxtaposed alignment. As shown in FIG. 5,
when panel 13 is swung to the upright position of FIG. 4, the
canopy panel 14 is carried therewith to lie forwardly of panel 13.
Canopy panel 14 is hingedly secured to the upper edge of panel 13
by the hinge 33 permitting the canopy panel to be swung upwardly
from the dotted position of FIG. 5 to the full line position
thereof. To effect the swinging movement and positioning of panel
14, a pair of articulated lifting arms 49 are provided. Each
lifting arm 49 includes a first rod 50 secured to a side stiffener
51 on the back of the canopy panel 14 and a second rod 52 pivotally
connected to rod 50 by a suitable pivot means 53 and provided at
its lower end with a suitable turnbuckle 54. The turnbuckle is
arranged to engage a pin 55 on the frame uprights 20 and 21
respectively. As best seen in FIGS. 5 and 6, suitable adjustment of
the turnbuckles 54 will adjust the angular position of the canopy
panel 14 about the axis of hinge 33.
The kicker panel 15 is hingedly connected to the lower end of panel
12 by a suitable hinge 56 permitting the kicker panel to be swung
downwardly from the dotted position of FIG. 3 to the full line
position thereof by removal of the retaining clips 28. As indicated
above, when the clips are so removed, they may be stored on the
stiffener 38 as shown in FIG. 6. The weight of composite
counterweight 29 and 30 is preselected to balance shell structure
10 at all times including when the canopy panel 14 is angularly
forwardly disposed as shown in FIGS. 5 and 6. Thus, while the base
17 extends substantially only rearwardly of the frame uprights 20
and 21 and the panels carried thereby, the shell structure
comprises a stable unit. Further, all of the mechanism for mounting
and positioning the panels in relation to the frame is mounted
rearwardly of the panels so that the panels present forwardly, as
shown in FIG. 1, a continuous sound-reflecting surface structure.
Further as shown in FIG. 1, canopy panel 14 is trapezoidal,
narrowing upwardly whereby the shell structures may be arranged in
a turned series with the canopy panels in abutment with each other
to form a closed upper panel portion of the complete shell. The
canopy panels may be readily adjusted by means of the turnbuckles
54 and the shell structure may be readily movably positioned on
casters 18 to provide an accurate fit thereof providing the
continuous series across the top of the shell as shown in FIG.
1.
As best seen in FIG. 6, when viewing the shell structure from
forwardly thereof, kicker panel 15 effectively hides the base 17.
However, when the kicker panel 15 is swung upwardly on hinge 56,
the base 17 is exposed below the bottom edge 57 of panel 12. Thus,
as shown in FIG. 8, a plurality of shell structures 10 may be
nested with each other in close juxtaposition by movement of the
respective bases below the panel edge 57. The narrowing arrangement
of the sidepieces 32 of the base 17 permits the unimpeded movement
of the next base thereinto. The arrangement of the shell structures
in the storage position of FIG. 2 is preferably such that the total
thickness of the panels and stiffeners is relatively small compared
to the depth of the base 17 so that the shell structures may be
nested in effectively minimum space. Illustratively, with the shell
structures disposed in the storage arrangement of FIG. 2, six such
shell structures 10 may be nested in a space of approximately 721/8
inches wide by 64 inches deep by 112 inches high. In the partially
folded position of FIG. 4, six of the shell structures 10 may be
nested in a space of approximately 721/8 inches wide by 84 inches
deep by 743/4 inches high. In the storage arrangement of FIG. 2,
the shell structures may be individually moved through conventional
door openings and the like as the depth of the base 17 is smaller
than the width and the length of the unit is less than the height
of the conventional door opening. In the illustrated embodiment,
the base has a depth of approximately 341/2 inches. Thus, while the
shell structures have a width of approximately 6 inches in use, by
folding them to the storage arrangement of FIG. 2, and moving the
shell structures in a direction parallel to the flat plane of the
panels, the shell structures may be readily moved on the casters 18
to and from performing and storage areas.
In erecting the shell structures to the sound-reflecting
arrangement of FIG. 6 from the storage arrangement of FIG. 2, the
user merely positions the shell structures on the casters in the
desired location and then swings the assembly of the upper panel 13
and canopy panel 14 on the pivots 43 in a counterclockwise
direction as seen in FIG. 3 to bring the canopy panel 14
forwardmost in the arrangement shown in dotted lines in FIG. 5. The
clip 34 is removed to permit swinging of the canopy panel 14 about
the hinge 33. At this time, the lifting arms 49 are connected only
to the canopy panel 14 and, thus, swing upwardly therewith to the
dotted position of FIG. 5. The turnbuckles 54 are then brought
downwardly from the dotted position of FIG. 5 to the full line
position thereof and engaged with the pins 55. Suitable adjustment
of the turnbuckles may then be effected to dispose the canopy panel
14 at the desired angle. The kicker panel 15 may be swung
downwardly upon removal of the clips 28 to complete the erection.
The entire shell structure may be locked in position on the floor
by suitable operation of the brakes 19 on the rearward casters
18.
As indicated briefly above, in forming the completed shell wall 11,
the plurality of shell structures 10 are disposed in side-by-side
relationship with the canopy panel 14 inclined forwardly suitably
to align with the adjacent canopy panels to form a continuous
inclined upper wall portion. The turnbuckles 54 may be adjusted to
assure that each of the canopy panels extends to the same uppermost
position. The shell structures 10 may be moved on the casters 18 to
bring the individual structures to proper relationship with the
adjacent structures to close any gaps between the canopy
panels.
Where sufficient height is available, the shell structures may be
stored in the partial storage arrangement of FIG. 4. Alternatively,
they may be stored in the full storage arrangement of FIG. 2.
Further, the desired arrangement of the shell structures in the
storage disposition may be affected by the dimensions of doorways,
etc., through which the shell structures are moved as between the
performing and storage areas. In either of the partial or full
storage arrangements, the shell structures are fully
counterbalanced so as to provide facilitated movement thereof on
the casters 18.
In rearranging the shell structures from the sound-reflecting
extended position of FIG. 6, the user need merely firstly raise the
kicker panel and secure it in the raised position by the clips 28.
The turnbuckles 54 are then removed from the pins 55 permitting the
canopy panel 14 to gently drop into face-to-face juxtaposition with
the upper panel 13. The panels may then be allowed to remain in the
partial storage position of FIG. 4, or swung about pivots 43 to the
full storage position of FIG. 2 as desired.
The base and frame uprights may be formed of heavy tubular steel
for improved rigidity. The wall panels may be formed of
conventional high density acoustical material which may be provided
with a suitable finish such as semigloss enamel. The shell
structures 10 are thusly of simple and economical construction
while yet providing the highly desirable features discussed
above.
The foregoing disclosure of specific embodiments is illustrative of
the broad inventive concepts comprehended by the invention.
* * * * *