U.S. patent number 3,798,839 [Application Number 05/285,345] was granted by the patent office on 1974-03-26 for movable wall panel.
This patent grant is currently assigned to Industrial Acoustics Company, Inc.. Invention is credited to Arne M. Kaufman.
United States Patent |
3,798,839 |
Kaufman |
March 26, 1974 |
MOVABLE WALL PANEL
Abstract
A movable wall panel is provided with an automatic compensating
system for ceiling deflections comprising a nestable top panel
casing or section spring-mounted within and projecting above an
upper body compartment or recess, which top casing in conjunction
with an overhead trolley support system and with linked dual jacks
which operate to extend a bottom closure panel casing from a lower
body compartment enable the panel to maintain a good seal against
the ceiling even when the ceiling is subjected to substantial
deflections of either a static type or of a temporary dynamic
nature. In certain embodiments, the trolley hanger studs are of a
fail-safe type having an internal safety cable extending through a
bore running the entire length of the stud.
Inventors: |
Kaufman; Arne M. (Plainview,
NY) |
Assignee: |
Industrial Acoustics Company,
Inc. (Bronx, NY)
|
Family
ID: |
23093826 |
Appl.
No.: |
05/285,345 |
Filed: |
August 31, 1972 |
Current U.S.
Class: |
49/127; 160/40;
49/425; 160/199 |
Current CPC
Class: |
E06B
7/18 (20130101); E05D 15/0613 (20130101); E04B
2/827 (20130101); E05Y 2900/142 (20130101) |
Current International
Class: |
E05D
15/06 (20060101); E06B 7/18 (20060101); E05d
015/26 () |
Field of
Search: |
;49/127,409,125,425
;160/40,199,206 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Taylor; Dennis L.
Attorney, Agent or Firm: Morgan, Finnegan, Durham &
Pine
Claims
I claim:
1. A wall panel which may be moved along tracks in a ceiling for
selective division of a room comprising:
A. a main panel member having top and bottom compartments
constructed therein, said panel member having means for slidably
hanging said main panel in the ceiling tracks;
B. a top panel section slidably mounted in telescopic relation
within the top compartments to form a top end surface for the main
panel member; said top section being spring biased for retractable
projection from said top compartment;
C. a bottom panel section slidably mounted in telescopic relation
within the bottom compartment to form a bottom end surface for the
main panel member, said bottom section being mounted on two or more
horizontally spaced jacks for selective projection from said bottom
compartment said jacks being secured to the main panel member;
and
D. means in the bottom and top sections in operative association
with the hanging means and the jack mounting means for allowing
uneven projection of said sections in order to allow the bottom and
top surfaces thereof to conform to ceiling and floors which are
untrue.
2. A wall panel which may be moved along tracks in a ceiling for
selective division of a room as described in claim 1 wherein the
hanging means comprises:
A. two or more ball bearing trolleys horizontally spaced along the
top panel sections, said trolleys engaging the tracks in the
ceiling in a translatable relation; and
B. studs secured to the trolleys and extending downward through
openings in the top section to the main panel section where they
are secured to support said main panel section.
3. A wall panel which may be moved along tracks in a ceiling for
selective division of a room as described in claim 2 wherein the
top panel section is slidably mounted on the studs, said studs
having coil springs mounted thereon to bias said top panel section
in the projected direction.
4. A wall panel which may be moved along tracks in a ceiling for
selective division of a room as described in claim 3 wherein the
openings in the top panel section through which the studs pass are
oversized to provide the means for allowing uneven projection of
said top panel.
5. A wall panel which may be moved along tracks in a ceiling for
selective division of a room as described in claim 1 wherein the
means for securing the jacks to the bottom panel section
comprises:
A. threaded bolt elements secured to the jacks;
B. a load distributing element secured to the main panel member
having tapped holes therein to receive the bolts; and
C. a channel member having passages therein through which the bolts
may pass and being situated between the jacks and the main panel
member, said passages being oversized to accommodate the bolts in a
loose fitting manner to allow movement of said channel member.
6. A wall panel which may be moved along tracks in a ceiling for
selective division of a room as described in claim 5 wherein the
bottom panel section is mounted on the jacks by means of bolts
which extend through slots in the bottom panel section, said slots
providing a range of sliding motion for said section, thereby
providing the means for allowing uneven projection of the bottom
panel section.
Description
CROSS-REFERENCE TO RELATED APPLICATION
The safety stud described herein is disclosed and claimed per se in
my concurrently filed application Ser. No. 285,347.
BACKGROUND OF THE INVENTION
Field of the Invention
This invention relates to an improved movable wall panel provided
with self-compensating means to obtain better sealing against fixed
parts of a building structure, particularly in coping with dynamic
and static variations in ceiling height. Better and safer handling
and installation characteristics for engagement with similar panels
are also obtained.
Prior Art
Numerous sliding doors and movable panels have been devised to
facilitate the dividing of large floor areas into smaller areas for
individual exhibits or into booths in gymnasiums, exhibition or
convention halls. Various supporting and guiding devices for
individual panels have been employed, including floor tracks,
overhead trolleys riding on wheels or balls in channels
incorporated within the ceiling, and folding door systems have also
been used. In general, the appearance and performance of these
movable panels have only been satisfactory in structures having
plumb walls and ceiling that are substantially parallel to the
floors.
Haws U.S. Pat. No. 2,945,535 describes a foldable partition system
employing a relatively complicated overhead trolley support system
wherein the panels are sealed at both top and bottom during
installation by hydraulic cylinders pushing the track support
system down into contact with the upper sealing strip of the
panels. In such installations, a rather bulky decorated housing
structure is extended downward below the ceiling.
Stein U.S. Pat. No. 3,253,552 is concerned mainly with improved
trolley systems for movable wall panels and these panels are
composed of two sections. For installation, the relatively shallow
bottom section is extended downward from its recess in the lower
end of the main body section by means of a single scissors type
jack. After the sealing strip beneath the bottom section reaches
the floor, further operation of the jack elevates the main body
section until the sealing strip on top thereof engages either the
overhead track or the ceiling and the trolleys no longer support
the weight of the panel. There is no provision for compensating for
deflections in the ceiling.
The disclosure in Burmeister U.S. Pat. No. 3,072,975 resembles that
of Stein except for employing crank arrangements as the panel
elevating mechanisms.
Little attention has evidently been paid to the problems
encountered with nominally flat ceilings that actually have
pronounced deflection curves of either a relatively permanent
nature as, for example, when the floor above is employed as a
warehouse or a temporary dynamic deflection as may result from the
changing loads occasioned by the use of the floor above as a
parking garage.
SUMMARY OF THE INVENTION
The present invention relates to a movable wall panel suspended
from two overhead hangers which comprises a body having separate
compartments adjacent to the top and bottom thereof and open at the
top and bottom, respectively, a bottom casing telescopically
mounted in said bottom compartment on a device operable to retract
said bottom casing within said compartment prior to moving said
panel or to extend said bottom casing below said bottom compartment
into engagement with the floor to close the space between said
bottom compartment and the floor and to elevate said body during
the installation of said panel in a selected location, and a top
casing telescopically and resiliently mounted in said top
compartment to engage and conform with the contours of a surface
thereabove to close the space between said top compartment and said
surface when said body is elevated in installing said panel.
Narrower aspects of the invention are concerned with the
combination with the foregoing panels of one or more of such
features as employing two similar jacks operated simultaneously by
a single actuating means to retract or extend said bottom casing,
connecting the jacks to the body in a manner that permits
longitudinal tilting of the bottom casing, the use of scissors
jacks and specified attachments, utilizing a pair of springs under
moderate compression as the resilient mounting for the top casing,
equipping the overhead hanger with a safety cable disposed in a
longitudinal channel through the hanger, providing stop fittings
fastened to the cable adjacent to each end of the channel,
disposing acoustic insulation between metal walls of the panel body
and disposing strips of resilient material on top of the top casing
and on the bottom of the bottom casing as effective seals against
sound, light and air flow. A number of significant benefits and
advantages are obtained with the novel structural features in the
panels of this invention; and a description of these follows the
detailed description of the panels.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal sectional elevation (partially schematic)
of a movable wall panel in the retracted condition and supported
from an overhead trolley system.
FIG. 2 is a vertical cross section taken along the line 2--2 in
FIG. 1.
FIG. 3 is an enlarged horizontal cross section taken along the line
3--3 in FIG. 2.
FIG. 4 is a side elevation view illustrating the manner in which
the wall panels are placed in position.
FIG. 5 is an enlarged sectional detail of a portion of FIG. 1.
DESCRIPTION OF SPECIFIC EMBODIMENTS
The movable wall panels of this invention may be conveniently
suspended from a spaced pair of trolleys so that they can be easily
guided to the desired location along suitable overhead tracks which
may be embedded deeply or flush with the ceiling or supported on
brackets below the ceiling. Each of the panels is comprises of at
least three distinct sections, a central section or main body of
the panel and two telescoping casings or sections that are mounted
in compartments or recesses in the body. The upper casing is
resiliently mounted on springs to project a predetermined distance
beyond the main body, and this mounting allows it to telescope at
least partially into the upper body compartment when the top casing
or section engages the track or ceiling. The bottom casing is
attached to a twin jack operating mechanism so that it can be
retracted into the lower body compartment when a panel is to be
moved or extended below the bottom of the main panel to serve as a
bottom closure.
After the wall panel has been shifted to a selected location by the
operator pushing it along the track with the bottom section
retracted in order to clear the floor, the operator then extends
the bottom casing downward by actuating its operating mechanism
first until that casing reaches the floor and then to raise the
entire panel until the top casing bears firmly against the ceiling.
The trolley system is so designed that the wall panel can freely
move upwardly for that purpose and the weight of the installed
panel is no longer supported by the trolley as the hanger studs are
lifted somewhat above their normal position so that the panel is
supported entirely by the floor on which it rests.
This upward movement is started after the panel has been placed
into edgewise engagement with a similar panel or perhaps a grooved
member or groove in a permanent wall.
A movable wall panel 10 is shown in FIGS. 1 and 2 in its retracted
mobile condition in which it is suspended from a pair of overhead
trolleys 11 and 12. This panel is an assemblage of a central
section or body 13 and two telescoping top and bottom casings that
can be at least partially housed in recesses in body 13. The
resiliently mounted top casing 14 projects above the body 13 and is
adapted to engage the overhead track to close off the space above
the body and also to aid in firmly securing the panel installation
in place. The retractable bottom section 15 is designed to be
extended from within body 13 to fix the panel in position and close
off the space beneath the body 13 and also to raise the sections 13
and 14 of the panel until the top casing 14 is in firm contact with
the track and forms a seal there. The bottom casing 15 is retracted
until it is entirely within a lower part of the body section 13
when it is desired to move the panel from one installed position to
another location, and that retraction also disengages the top
casing 14 from the ceiling and shifts the weight of the panel to
the trolleys as will be described hereinafter.
The wall panel is usually a welded sheet metal structure which
includes a pair of spaced outer walls 16 and 17 having their
vertical edges bent inwardly at right angles to form flanges 18,
19, 20 and 21 as illustrated in FIG. 3. Vertical channel members
22, 23 are secured between the outer walls 16 and 17; and channels
22 and 23 do not extend into the top and bottom compartments,
instead they terminate short of the channels 25 and 28 described
hereinafter. Depending on the width of the panel, one or more
channels (not shown) of the same length and parallel to channels 22
and 23 may be spot welded to walls 16 and 17 for the purpose of
stiffening the panel. The vertical edges of each panel are designed
for tongue and groove engagement with adjacent wall panels. Thus, a
channel 26 of blunt V-shape in cross section may be constructed
from sheet metal or other suitable material, and secured to the
inner surface of flanges 18 and 19 to provide the outwardly
extending tongue projection. A slightly larger V-shaped channel 27
which may be constructed from perforated or solid sheet material is
secured in the inner surfaces of flanges 20 and 21 and extends
inwardly therefrom to provide the vertical groove along the
opposite edge of the wall panel.
The compartment at the upper end of the body 13 is bounded mainly
by an upper channel member 28 secured between the outer walls 16
and 17 with the flange portions of the channel member extending
upwardly to the top edges of the outer walls; and its end walls are
continuations of tongue channel 26 and groove channel 27, but the
spacing channel members 22 and 23 are not employed in this top
compartment section of the panel body 13.
The top casing 14 is an inverted channel member 29 which projects
out of the upper end of the body 13. The ends of casing 14 are
closed by securing suitable tongue and groove channels 30 and 31,
respectively to the ends of channel 29. The external dimentions of
this top casing 14 are slightly smaller than the internal
dimensions of the top compartment, and channel 29 is slidably
mounted within the channel 28 which has a polytetrafluoroethylene
tape or coating 32 on the upper half of its surface to facilitate
the sides of channel 29 sliding into channel 28 freely when the
rubber sealing strip 33 is pushed into firm engagement with any
ceiling structure, such as the box track 34. To properly distribute
the weight of the wall panel, rigid supporting plates 24 of metal
(e.g. 3.5 inches .times. 5 inches) are secured to the lower surface
of channel 28. The casing 14 is resiliently mounted on a pair of
coil springs 35, each surrounding a trolley hanger stud 36 and
located near an end of channel 28, which springs are mounted on a
large spring-retaining washers 37 which rest on the bottom of
channel 28 and are fastened to the plate 24 by machine screws.
These springs also bear against the spring-retaining washers 37
which are fastened to the under side of the horizontal section of
channel 29. Springs 35 are adjusted in known manner to a controlled
degree of compression by means of threaded fittings 38 at each end
of the three flexible, stranded, restraining wires 39 surrounding
each spring.
Near the bottom of body 13 is an inverted lower horizontal channel
25 with its flanges thereof extending downwardly and securely
attached to the outer walls 16 and 17. Channel member 25 is
positioned a suitable distance above the lower edges of the outer
walls so as to provide a recess or bottom compartment within the
body 13 for housing the schematically shown twin jack mechanisms 40
and 41 as well as bottom casing 15 when in the retracted position
as shown in FIGS. 1 and 2.
Bottom casing 15 is essentially a channel member 42 with relatively
long upwardly extending flanges, and its ends are closed by
securing suitable tongue and groove channels 43 and 44,
respectively, to the ends of channel 42 which has a laminated
rubber sealing strip 45 on its lower exterior surface conforming to
the shape of channels 43 and 44. The external width and length of
bottom casing 15 are slightly smaller than the internal dimensions
of body 13 so that the casing can easily be telescoped into the
body of the panel. Either or both of the top casing 14 and the
bottom casing 15 may be built larger for telescoping around the
exterior of the upper and lower portions of body 13 rather than
nesting into internal compartments of the panel, but such
arrangements are usually less desirable from standpoints of
appearance and possible damage in exposing more of the moving
parts.
The operating mechanism is a combination of the bodies of two
conventional screw-operated scissor jacks 40 and 41 arranged in
tandem for simultaneous operation and each includes a generally
horizontal threaded screw shaft 46 of special construction and a
pair of jack platforms 47 and 48 positioned, respectively, above
and below the threaded shaft. This twin jack arrangement produces a
very stable wall panel installation.
The operating mechanism for raising and lowering the bottom casing
15 is connected to the body 13 of the panel in a unique and
flexible manner to permit the bottom of channel 42 to be tilted up
or down a small distance of perhaps one-half inch at either end.
This flexibility permits the jacks and the bottom casing to adapt
to a slightly tilted suspension of the panel by the two trolleys
and also to uneven or sloping floors. The bottom casing 15 is
attached to the lower jack platform 48 by means of the shoulder
bolts or screws 49 extending through the slots 50 in the bottom of
channel 42 into threaded engagement with tapped holes in the lower
platforms 48 of the jacks. These shoulder bolts permit platforms 48
to slide back and forth on the horizontal inner surface of channel
42 within the limits imposed by the length of the slots, and this
freedom of motion is desirably improved by affixing
polytetrafluoroethylene coatings or tapes on those surfaces of
platforms 48 and channel 42 which are in contact with one another.
The upper platforms 47 of the jacks are each rigidly attached by
means of a two machine screws (not shown) to holes tapped in a
structural member in the form of a rectangular tubing or a box
channel 51 having a wall thickness of approximately one-fourth
inch. This bottom section structure, including the connection
between the jack which is described hereinafter, may conveniently
be prefabricated as a subassembly which is then inserted and
connected with the body 13 of the panel.
The box channel 51 is attached to the body in a secure manner which
nevertheless permits the aforementioned swinging or tilting motion
of the box channel and all elements of the bottom section beneath
it. This is accomplished by attaching the box channel 51 by means
of two bolts 52 to a load distributing element in the form of the
rigid metal plate 53 which is welded to the upper surface of the
channel member 25. The two bolts 52, spaced only two or three
inches apart, are the only connection between the box channel and
the load distributing plate above it; and while these bolts are
securely fastened in tapped holes in plate 53, the manner of
connecting the bolts to the box channel provides the flexibility
described earlier. The bolts 52 carry pipe collars 54 that are
slightly longer than the depth of box channel 51 (e.g., 1/32 to
1/16 inch longer for a 3 inch box channel). These pipe collars
serve as spacers along with the relatively thick washers 55 (e.g.,
1/8 inch thick) and thus permit the bolts 52 to be securely
tightened without similarly restraining box channel 51 against all
movement. In addition, a deliberately loose fit of the collars 54
in the holes 56 in the box channel is provided to promote
flexibility in the mounting of the bottom casing 15. For example,
the diameter of the holes 56 is desirably of the order of 1/8 to
1/4 inch greater than the outer diameter of the collars 54.
In addition to the conventional bodies and elevating linkages, the
twin jack simultaneous operating system illustrated in FIG. 1
consists of a hardened hexagonal bar 57 extending from the vicinity
of the overlapping slots 58 and 59 in grooved channels 27 and 44,
respectively, to its welded connection with the unthreaded end of
the screw shaft 46 which raises and lowers jack 40; and the other
end of shaft 46 is connected to the jack 41 through universal joint
60 having one arm welded to the threaded end of that screw shaft
and its other arm welded to a square bar 61 which is slidably
fitted into the square broach 62 to provide an expansion coupling,
and a second universal joint 63 which has one arm welded to the end
of broach 62 and the other arm welded to the screw shaft 46 of jack
41. This drive train for simultaneous operation of the connected
operating screw shafts 46 of the two jacks is actuated by extending
a conventional socket wrench through the slots 58 and 59 and
rotating the hexagonal bar 57 which is sized to fit such a wrench.
The distance between jack platforms 47 and 48 is increased by
rotating screw shafts 46 in one direction thereby pushing bottom
casing 15 downward out of its recess, and the casing is retracted
by rotation of these shafts in the opposite direction.
The screw shafts 46 of these jacks are also of unique design in
having two extra bushings besides the conventional single bushing
64 affixed to the shaft 46 and which bears against ball thrust
bearing 88 and the unthreaded trunnion 65 when the jack is being
extended. The extra bushing 66 is welded to the shaft 46 on the
other side of that trunnion, and it bears against thrust bearing 89
and the unthreaded trunnion when reverse rotation of the screw
shaft 46 is being used to retract the jack. Bushing 66 provides for
complete and positive retraction without the nuisance of applying
pressure between the jack platforms as is necessary for the
complete closure of a conventional scissors jack. Thus bushing 64
may be described as an elevation drive bushing and bushing 66 as a
retraction drive bushing. The other extra bushing 67 is welded onto
the threaded portion of shaft 46 in a predetermined location to
serve as a stop which strikes the threaded trunnion 68 and halts
further rotation of shaft 46 and thus limits the degree to which
the jack can be extended. This prevents the panel from being raised
so high that the top casing 14 is telescoped so greatly as to have
little available range of movement to compensate for downward
deflection of the ceiling.
The sheet metal shell of the body 13 is bounded by the side walls
16 and 17 and the channels 23, 25, 26 and 28, and this internal
space is usually filled with a suitable acoustic fibrous material
selected for the thermal insulating and sound absorbing
requirements of the particular installation. In general, fiber
glass mat is very satisfactory for such purpose, and it is also
desirable to fill the top body compartment between channel 28 and
casing 14 and the bottom compartment between channel 25 and casing
15 with the same material.
It is generally preferable to build relatively narrow and stable
movable panels as exemplified by a width of five feet for
convenience in handling, shipping and storage as well as providing
a better fit against sagging ceilings and uneven floors. Panel
height is of course dictated by ceiling height and this sometimes
exceeds 40 feet. In the case of such extremely tall panels, it is
contemplated that the central body section between the channels 25
and 28 may desirably consist of several smaller units of 12 to 18
feet in height (or less if necessary) that can be easily shipped
and carried through restricted passageways for assembly as a tall
panel at the installation site.
Each trolley 11 and 12 supporting an end of the wall panel includes
a circular bearing plate 69 and a plurality of spherical bearing
members 70 individually housed in the bearing retainers 71 which
contain a suitable lubricant for the bearings as well as a wiper
seal (not shown) to prevent the entry of foreign matter. These
bearing retainers 71 are spaced uniformly and concentrically around
the threaded stud 36. In many embodiments, six bearing members are
desirable in enabling the designer to employ overhead track
channels of commercially available sizes, and they handle well at
tee and ell intersections. However, for installations that require
considerable handling over cross-shaped intersections, it may be
advantageous to employ trolley structures having nine or more
spherical bearing members as recommended in Stein U.S. Pat. No.
3,253,552.
The spherical bearing members support the bearing plate and trolley
on a suitable overhead track which can be an almost completely
enclosed box channel 34 shown in FIG. 2 with a longitudinal opening
or slot 72 running along the entire length of its lower surface to
provide for the movement of hangers 36. This box track 34 may be
fabricated from a single piece of steel plate, and it may be
secured to a ceiling with suitable bolts or brackets for mounting a
track flush, in the ceiling or below the ceiling.
When the bottom casing 15 is retracted into its compartment in the
panel body 13, the weight of the movable panel is suspended from
the long stud hangers 36 which transfer the load to the centers of
the two bearing plates 69. Each stud 36 extends downward through
slot 72 and apertures in the sealing strip 33, the top of channel
29 and the bottom of channel 28 where its thread 73 engages the
thread in a tapped hole in the rigid plate 24. Thus, the stud is
rigidly attached to the load bearing plate 24 and this connection
is secured against loosening by means of the jam nut 74 and its
lock washer on top of the plate as well as the retainer snap ring
75 which fits into a circumferential groove (not shown) in stud 36
below the plate 24.
At its upper end, the stud 36 extends through a hole 76 in the
bearing plate 69, and this aperture is about 1/16 inch larger in
diameter than the stud in order to permit a small amount of tilting
of the stud without similar tilting of the spherical bearing member
assembly. A thrust bearing assembly 77 consisting of two hardened
steel washers, one above and one below a roller thrust bearing, is
located on the stud immediately above the bearing plate 69. There
is a slotted nut 78 engaging the threaded upper end of stud 36, and
this nut is locked in place by the semi-circular spring 79 which
has tab ends bent inwardly toward one another. These tab ends
extend through the slot in nut 78 and into opposite ends of a hole
drilled diametrically through the stud. At least one other such
hole 80 is drilled through the stud at a different level in order
to provide for adjusting the distance between the top of the panel
and the overhead track. In particular, it is usually desirable to
tilt the tongue edge of the panel slightly backward from its bottom
corner to facilitate engaging it with the groove in the adjacent
wall panel. This tilting can be readily accomplished by adjusting
the nut 78 on the stud near the tongue edge 26 of the panel and
locking spring 79 into the lower hole as in FIG. 2 while the nut on
the remote stud is locked with the spring at the upper hole 80.
From an appearance standpoint, the studs 36 are desirably of the
smallest diameter consistent with safety in order that the slot 72
and the overall size of the box track 34 may be as small and
inconspicuous as possible. On the other hand, the stud 36 may be
subjected to an extreme impact or bending moment in some
installations if the wall panels are handled carelessly or roughly
when being moved. The studs are typically of the order of 17 inches
in length and they may be subjected to tremendous forces, as for
instance, in the case of a panel about 36 feet long and weighing
about 2000 pounds being pushed rapidly into an ell or tee
intersection so that the foremost long stud hanger strikes the edge
of the cross track with a great impact. Accordingly, it is
desirable to provide a fail-safe type of stud which is novel and
peculiarly adapted for use in the long stud hangers in the panels
of the present invention.
One of these safety studs 36 is illustrated in FIG. 2 and it
incorporates a 1/8 inch diameter flexible stainless steel wire 81
of 7 .times. 19 standard construction disposed in a 3/16 inch
diameter central longitudinal bore that extends through the entire
length of the stud. The wire or cable 81 has swaged fittings of a
dome shaped type 82 resting on the top end of the bore and a
cylindrical collar or barrel 83 hanging about 1/4 inch below the
lower end of the bore. Thus, the safety wire has an effective or
free length about 1/4 inch greater than that of the stud 36 so that
the wire remains in an unstressed condition without any wear or
fatigue effects as long as the stud is intact. However, in the
event of the stud being fractured by any mishap, the collar 83 will
be drawn up against the bottom of the stud and the safety cable 81
will take up the entire load which it can readily sustain in view
of its great tensile strength and flexibility. The operator
handling the panel will be aware of the breakage of the stud by
reason of the flexing motion felt as he pushes or pulls the panel.
Also, the sudden 1/4 inch sag in the position of an end of the door
will warn him of the breakage of the stud. Such a safety device is
of unusual importance when incorporated in a movable wall panel in
substantially eliminating the risk of death or personal injury or
extensive damage to nearby equipment from falling panels in view of
the fact that panels of great length are frequently employed in
exhibitions, trade shows, etc. attended by large numbers of people
and with many costly instruments and equipment on display.
The manner in which the wall panels are installed in their proper
positions is illustrated in FIG. 4 with respect to wall panels 84,
85 and 86 which are shown prior, during and after installation,
respectively. Panel 84 is in its mobile state as it is suspended
from the pair of overhead trolleys with bottom casing 15 fully
retracted. In this condition, the wall panel is guided along the
overhead track to a desired position adjacent other wall panels
such as 85 and 86.
Panel 85 is being installed and this is positioned adjacent a
previously installed wall panel 86, whereupon the operator actuates
the twin jack mechanisms by means of a socket wrench or other
suitable wrench. Mating engagement of long tongue edges with
grooved edges is facilitated by having the tongue edge 26 tilted
backward from the bottom, and first inserting the tongue into the
lower end of the vertical groove 27. Such tilting may be readily
accomplished prior to installation by adjusting the stud nuts 78 to
raise the tongue edge of the panel above its grooved edge. In
addition, before and while operating the jack mechanism, it is
desirable for the operator to apply pressure to the lower portion
of the panel 85 to hold the tongue of that panel in close abutting
engagement with the lower end of the groove of adjacent panel 86.
It should be noted that due to the flexible manner of mounting the
jack mechanism in the body 13, the bottom casing 15 will properly
engage the floor. Initial operation of the jacks has pushed the
bottom casing 15 down into sealing engagement with the floor but
the level of body 13 was not changed and there is still a gap above
the panel 85. It should be noted from FIG. 1 that the twin jack
arrangement is located slightly off center and nearer its own
grooved edge. Thus, as the operation of jack mechanixm is continued
to raise the body 13, the panel 85 tilts back to the vertical, that
is toward the top of adjacent panel 86 as indicated by arrow 87, to
thereby assure close abutting engagement between the panels at
their upper ends. Further operation of the twin jack mechanism
raises the body 13 and top casing 14, until the overhead track
compresses top casing 14 into its compartment in the panel. After
the sealing strip 33 reaches the overhead track telescoping of the
top casing 14 into the recess provided by channel 28 commences with
any further lifting of body 13 by the jacks. Accordingly, the panel
installation is complete soon after such telescoping starts;
typically, a firm installation is obtained with top casing 14
telescoped about two inches. As the body 13 and top casing 14 are
raised to the levels illustrated in panel 86 the studs 36 move
upwardly through the centers of their respective bearing plates 69
so that the weight of the wall panel is no longer supported by the
trolleys.
Wall panel 86 is shown in the installed position with the wall
panel engaging both the floor and the ceiling and it has already
compensated for any permanent ceiling deflections by the resilient
mounting which also permits a restricted degree of longitudinal
tilting of the top casing. Any further variations in the ceiling
height, either of a static or dynamic nature, are automatically
compensated for by the further compression or extension of coil
springs 35.
As previously mentioned, the wall panel is filled with fibrous
material and thus provides excellent acoustic insulation. This
effect is enhanced by rubber sealing strips 33 and 45 secured to
the top and bottom, respectively, of the wall panel to provide
seals which prevent the flow of acoustic energy either above or
below the wall panel. As may be seen in FIG. 3, the tongue and
groove fitting between adjacent panels provides a labyrinth path
which restricts the flow of acoustic energy between adjacent
panels. Also with channel member 27 perforated and backed by
fibrous acoustic energy absorbing material, there is further
significant attenuation of any acoustic energy that might otherwise
pass between the edges of adjacent panels.
Many benefits and advantages are derived from the novel structure
of instant wall panels. The spring-mounted telescoping construction
of the top casing enables it to automatically adjust for variations
in the height of a ceiling and the track supporting the panel. Such
variations may be either upward or downward ceiling deflections of
either a static type or a temporary dynamic nature without loss of
the acoustic seal or damage to panels from changing ceiling heights
after installation of the panels. Within the designed compensation
range of the panel, changing deflections of ceiling or support
track do not restrict its mobility or its installation or its
storage. Also, carpets or floor tile may be subsequently laid on a
bare floor by merely temporarily moving installed wall panels, as
no floor tracks are involved and the resiliently mounted top
casings easily compensate for the thickness of such floor
coverings. While ceiling deflections are usually of a curved rather
than a linear nature, such curves tend to be quite long; therefore
the flat tops of the five-foot wide panels provide close fits
against the ceiling contours. A resilient sealing strip of suitable
thickness located on top of the casing completes the formation of a
good seal at the ceiling; consequently such seals effectively
prevent any drafts or passage of light, and no significant amount
of noise and other sounds are transmitted across the space above
the panels.
The overhead suspension system is designed to permit the use of the
deflection-compensating top casing and the bottom casing is
designed for a moderate degree of longitudinal tilting. Such
tilting may be employed with suitable adjustment of the overhead
hangers to facilitate the fitting or engagement of the tongue edge
of the panel with the grooved edge of the adjacent panel; also, it
enables the bottom casing to adapt itself to uneven floor contours.
The use of two or more jacks provides a very desirable increase in
the stability of the installed panel over that obtainable with a
single jack. In addition, this permits using jacks of lesser width
than would be required for a single jack and that is helpful in
keeping the thickness of the panel as small as possible; moreover,
it allows one to use jack bodies of common commercial size instead
of ordering a special custommade jack for heavy panels. The
provision of a stop bushing on at least one of the jacks at a
predetermined location for a particular installation allows the
panel to be installed rapidly by preventing it from being raised
too high and thus restricting and designed range of compensation
for ceiling deflections. Also, the addition of a retraction drive
bushing to each jack facilitates the full retraction of the bottom
casing by the jacks.
Finally, the use of fail-safe bolts or studs with internal safety
cables is particularly desirable for the long hanger studs required
for the deflection-compensating mounting of the top casing,
particularly where such studs may be subjected to extreme impact or
bending moments from the accidential or careless handling of panels
as tall as twenty feet or higher.
Although the present invention has been described in great detail
in respect to one embodiment of the invention for the purpose of
providing a complete disclosure, it will be apparent to those
skilled in the art that many other embodiements and modifications
are within the purview of the invention. For example, synthetic
resins, and especially those reinforced with glass and other
fibers, may be substituted for many of the steel structural
elements which are generally preferred. Accordingly, this invention
should not be construed as limited in any particulars except as may
be recited in the appended claims or required by the prior art.
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