U.S. patent number 3,620,564 [Application Number 04/865,616] was granted by the patent office on 1971-11-16 for mobile center.
This patent grant is currently assigned to Wenger Corporation. Invention is credited to Daryl D. Douglas, Harvey M. Urch, Jerry A. Wenger, John N. Polivka, Leonard Nordman.
United States Patent |
3,620,564 |
|
November 16, 1971 |
MOBILE CENTER
Abstract
A mobile center having a body and chassis with ground-engaging
wheels and with an over-the-road capability wherein the body has a
roof, sides and ends with the sides being defined by a pair of
raisable canopies and with a pair of floor structures disposed
within the body and interiorly of the canopies for over-the-road
travel. The floor structures can be lowered from each side of the
body to provide floors beneath the canopies with powered actuating
means for operating one or both of the canopies and floor
structures between operative and inoperative positions. Also,
enclosures are hingedly connected to the canopies and to the floor
structures to enclose the space between the floor structures and
canopies to provide additional uses for the mobile center.
Inventors: |
Jerry A. Wenger (Owatonna,
MN), Daryl D. Douglas (Owatonna, MN), Harvey M. Urch
(West Concord, MN), Leonard Nordman (Owatonna, MN), John
N. Polivka (Minneapolis, MN) |
Assignee: |
Wenger Corporation
(N/A)
|
Family
ID: |
25345894 |
Appl.
No.: |
04/865,616 |
Filed: |
October 13, 1969 |
Current U.S.
Class: |
296/83; 160/19;
52/69; 296/175 |
Current CPC
Class: |
B60P
3/0252 (20130101); E04H 3/28 (20130101) |
Current International
Class: |
B60P
3/025 (20060101); B60p 003/34 () |
Field of
Search: |
;296/26,23.2,23.6,56,23.7 ;52/68,69 ;160/19,59,82,207 ;49/199 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Philip Goodman
Attorney, Agent or Firm: Hofgren, Wegner, Allen, Stellman
& McCord
Claims
We claim:
1. A mobile center having a body with ends, sides, and a roof and
with a chassis mounting a plurality of ground-engaging wheels, a
canopy hinged along an edge of the roof to define a side of the
body when lowered and projecting outwardly from the roof when
raised, a pair of generally vertical guide tracks located one
adjacent each end of said body, a pair of spaced-apart arms
pivotally connected at one of their ends to opposite ends of said
canopy, the other ends of said arms being movable along said pair
of guide tracks, cable means connected to said other ends of each
of said arms, and power means connected to said cable means to move
said cable means and cause movement of said arms along said guide
tracks.
2. A mobile center as defined in claim 1 including a floor
structure positionable beneath said canopy, said floor structure
including an inner section hinged along an edge of said body and an
outer section hinged to said innner section, and actuating means
pivotally connected between said body and the inner floor section
to cause relative pivotal movement therebetween.
3. A mobile center as defined in claim 2 wherein there are a pair
of said canopies hinged one to each side of said body.
4. A mobile center as defined in claim 2 wherein said power means
and actuating means are hydraulic cylinders, a control station on
said body, and valve means at said control station for controlling
the operation of said power means and said actuating means.
5. A mobile center as defined in claim 2 wherein the space between
said canopy and said floor structure can be enclosed comprising, an
auxiliary sidewall hinged to the outer edge of the canopy whereby
said auxiliary sidewall can fold down from the canopy when the
canopy is raised, a first pair of end walls hinged to opposite ends
of said inner floor section and a second pair of end walls hinged
to opposite ends of said outer floor section, said first and second
pair of end walls being movable to an upright position to close off
the space defined by the floor structure, the canopy and the
auxiliary sidewall.
6. A mobile center having a body with ends, sides, a roof and with
a chassis mounting a plurality of ground-engaging wheels, a pair of
canopies hinged along opposite edges of the roof for pivotal
movement about axes extending lengthwise of the body, said canopies
defining the sides of the body when lowered and projecting
outwardly from the roof when raised, two pairs of lift arms with
one pair associated with one of said canopies, power means for
operating said lift arms, a pair of floor structures each including
inner and outer floor sections hinged together to fold together for
storage and with said inner floor sections each hinged to said body
along the length and at opposite sides thereof for movement between
a storage position inside said body and a lowered floor position,
actuating means for moving each of said floor structures including
a connection between said body and the underside of an inner floor
section, and a circuit for controlling said power means and said
actuating means.
7. Mobile center as defined in claim 6 wherein at least one of said
canopies has an auxiliary sidewall hinged to the outer edge thereof
and the inner and outer floor sections therebeneath have end wall
sections hinged to the front and rear edges thereof to provide an
enclosed space.
8. A mobile center having a body with ends, sides, a roof and with
a chassis mounting a plurality of ground-engaging wheels, a canopy
hinged along an edge of the roof to define a side of the body when
lowered and projecting outwardly from the roof when raised, a pair
of arms pivotally connected at one of their ends to said canopy,
the other ends of said arms being movable along a pair of generally
vertically extending guide tracks at each end of the body and
adjacent said canopy when closed and associated one with each of
said other arm ends, and power means connected to said other arm
ends for raising and lowering said arms.
9. A mobile center having a body with ends, sides, a roof and with
a chassis mounting a plurality of ground-engaging wheels, a canopy
hinged along an edge of the roof to define a side of the body when
lowered and an outward extension of the roof when raised and
extended, a floor structure pivoted to said body and movable
between a position stored inside said lowered canopy and an
extended horizontal position, power operated mechanism for raising
said canopy and for moving said floor structure, and an enclosure
for said space between the extended canopy and floor structure
comprising an auxiliary sidewall pivoted to the extended end of the
canopy to extend downwardly to the floor structure, and end walls
pivotally attached to the front and rear of the floor structure to
be movable to upright positions to span the distance between the
canopy and floor structure.
10. A mobile center as defined in claim 9 wherein the floor
structure has an inner section with an outer section pivoted
thereto, and each of the inner and outer sections have a portion of
an end wall pivotally connected thereto.
11. A mobile center having a body with ends, sides, a roof and with
a chassis mounting a plurality of ground-engaging wheels, a canopy
hinged along an edge of the roof to define a side of the body when
lowered and projecting outwardly from the roof when raised, a pair
of arms pivotally connected at one of their ends to said canopy,
the other ends of said arms being movable along a pair of generally
vertically extending guide tracks positioned at each end of the
body adjacent a side thereof and associated one with each of said
arm ends, power means for moving said arms to move said canopy
including a cylinder mounted to and extending along the chassis and
having a rod, a pair of cables connected to said rod with one cable
extending to a connection with an end of an arm whereby movement of
the rod relative to the cylinder causes simultaneous movement of
both arms for movement of the canopy
12. A mobile center as defined in claim 11 wherein said rod is
connected to a carriage, and enclosed structure on the chassis for
said carriage, guide rollers on said carriage mounting the carriage
for movement along the enclosed structure and the cables being
connected to said carriage.
13. A mobile center as defined in claim 11 and including a floor
structure positionable beneath said canopy, and actuating means
pivotally connected between said body and the floor structure to
cause relative pivotal movement therebetween.
14. A mobile center having a body with ends, sides, a roof and with
a chassis mounting a plurality of ground-engaging wheels, a canopy
hinged along an edge of the roof to define a side of the body when
lowered and projecting outwardly from the roof when raised, a pair
of arms pivotally connected at one of their ends to said canopy,
the other ends of said arms being movable along a pair of generally
vertically extending guide tracks associated one with each of said
other arm ends, cable means connected to each of said arms, power
means connected to said cable means to move said cable means and
cause movement of said arms along said guide tracks, a floor
structure positionable beneath said canopy, and actuating means
pivotally connected between said body and the underside of the
floor structure to cause relative pivotal movement
therebetween.
15. A mobile center having a body with ends, sides, a roof and with
a chassis mounting a plurality of ground-engaging wheels, a member
defining a canopy hinged along an edge of the roof to define a side
of the body when lowered and an outward extension of the roof when
raised and extended, a member defining a floor pivoted to said body
and movable between a position stored inside said lowered canopy
member and an extended horizontal position, power operated
mechanism for raising said canopy member and for moving said floor
member, and an enclosure for said space between the extended canopy
and floor members comprising an auxiliary sidewall pivoted to an
outward exposed end of one of the members for movement to an
upright position spanning the distance between said members, and
end walls pivotally attached to the front and rear of the floor
members for movement to upright positions to span the distance
between said members.
Description
This invention pertains to mobile centers, either self-propelled or
trailered, providing an easily set up stage for the performing arts
and also providing expandable enclosures which can travel to
particular locations to fulfill a need for an enclosed space, such
as a field medical center. The assignee of this application is the
owner of U.S. Pats. Nos. 3,181,203; 3,217,366; and 3,258,884,
disclosing prior types of mobile centers which provided a raisable
canopy and a form of floor structure transported with the mobile
center which could be set up for use of the unit. These prior
devices did not have the improved structure for raising a canopy
which provides for additional interior access openings to the
mobile center, nor did they provide for total expansion of the
mobile center by operation of canopies and floor structures from
both sides of the body. Additionally, such prior devices did not
have floor structures which were permanently connected to the body
and which could be moved into position by power structure. Also,
such prior devices did not have enclosures associated with the
canopy and floor structure for providing a totally-enclosed
space.
Other prior art known to the applicants includes U.S. Pats. Nos.
1,521,803 and 2,155,876 and the following foreign patents:
French Pat. No. 644,431,
Swiss Pat. No. 302,346, and
British Pat. No. 12,992. These patents do not show the structures
having the combination of features disclosed herein providing the
new and improved results, as outlined hereinafter.
SUMMARY
An object of this invention is to provide a new and improved mobile
center having all necessary structure for providing a portable
stage or similar arrangement for the performing arts and other uses
as well as total enclosures for additional uses and wherein all of
the structure is permanently connected to the body of the mobile
center and power means are provided for simple set up of the mobile
center when it is at the desired location.
Still another object of the invention is to provide a mobile
center, either self-propelled or trailered, having a body with a
pair of sides and at least one side being defined by a canopy
hingedly connected to the roof of the body for pivotal movement
about an axis longitudinally of the body and with power means for
raising the canopy including a pair of arms connected at one end to
the canopy and having their other ends movable along generally
vertical guide tracks, and power operated cables connected to said
other ends whereby the canopy may be raised. The structure for
raising the canopy is out of obstructing relation with access
openings to the mobile center body.
Still another object of the invention is to provide a mobile center
as defined in the preceding paragraph wherein floor structure is
hingedly connected to said body and is stored within the interior
of the body and interiorly of the canopy when folded down for easy
transport of the mobile center and which can be power-operated to
an operative position and with the floor structure having two
hingedly connected sections to provide a maximum extent of floor
area.
An additional object of the invention is to provide a mobile
center, as defined in the preceding paragraphs, wherein there is a
canopy and floor structure at each side of the body to provide a
total floor area twice that of the two floor structures plus that
of the main body of the mobile center. Power means for operation of
each of said components is positioned at both sides of the
body.
Still another object of the invention is to provide a mobile
center, as defined in the preceding paragraphs, wherein the canopy
and floor structure sections each hingedly mount additional panels,
with a panel hinged to the outer end of the canopy being movable
down to provide an auxiliary sidewall and with end wall panels
hingedly connected to the sections of the floor structure being
movable upwardly to be positioned beneath the extended canopy and
with the auxiliary sidewall enclosing the interior of the mobile
center.
FIG. 1 is a perspective view of a self-propelled mobile center
having the canopies and floor structures at both sides of the body
extended in operative position;
FIG. 2 is fragmentary perspective view of the mobile center,
looking generally from the rear thereof, showing an intermediate
stage in the setup of the mobile center, with the canopy extended
and with the floor structure still in storage position;
FIG. 3 is a perspective view of a portion of the mobile center
showing the canopy and floor structure extended and with portions
thereof broken away to show the operating mechanism for the canopy
and floor structure;
FIG. 4 is a detail section, taken generally along the line 4--4 of
FIG. 3;
FIG 5 is a detail section, taken generally along the line 5--5 of
FIG. 3;
FIG. 6 is a detail section, taken generally along the line 6--6 in
FIG. 3;
FIG. 7 is a fragmentary plan view of a portion of the chassis of
the mobile center showing the power means for operating the
canopies;
FIG. 8 is a view, similar to FIG. 7, showing the hydraulic circuit
for the power means and actuating means for the canopies and floor
structures;
FIG. 9 is a fragmentary, central transverse section of a modified
embodiment of a mobile center and showing certain parts thereof in
extended operative position in broken line; and
FIG. 10 is a perspective view, similar to FIG. 3, showing the
structure of FIG. 9 in set up position.
DESCRIPTION OF THE EMBODIMENTS
The mobile center is shown generally in FIGS. 1, 2 and 3 and in its
preferred embodiment is self-propelled, with a truck-type structure
including a cab, indicated generally at 10, having an engine
providing power for over-the-road operation of the mobile center
and a body, indicated generally at 12, on a chassis, indicated
generally at 15, which chassis has front wheels 16 and 17 and dual
rear wheels 18 and 19.
The body 12 has a roof 20, a front-end wall 21, a rear end wall 22,
and a pair of sidewalls 23 and 24. Each of these canopies defining
a sidewall is hingedly connected to the roof of the body along an
edge thereof for pivotal movement about an axis extending
longitudinally of the body. Such a hinge connection is shown in
FIG. 6 for the canopy 24, wherein spaced-apart hinges 25 are
connected between the roof and canopy and a weather seal, in the
form of a continuous strip 26, extends along the joint. The hinge
connection for the canopy 23 is similar to that shown in FIG. 6 for
canopy 24.
Each of the canopies is formed of a connected frame structure, with
a solid panel exterior and with front and rear ribs 30 and 31 each
having an operating arm 32 and 33, respectively, pivotally
connected thereto at 34 and 35, respectively. These arms have their
other ends provided with a grooved roller with the roller 38 for
the arm 32 being shown in FIG. 3. This roller is mounted on a pin
extending transverse to the length of the arm whereby the grooved
roller can travel in a slot 39 formed in a welded track 40 near the
front end of the body. The arm 33 has a similar roller movable in a
slot 41 in a welded track 42 at the rear end of the body. Each of
the arms 32 and 33, at their inner ends mounting the slot-engaging
rollers, is connected to an individual cable which transmits motion
from power means in the form of a cylinder 45 (FIG. 7) mounted on
and extending lengthwise of the chassis 15. The cylinder 45 has a
rod 46 extending from an end thereof, with a carriage 47 affixed to
the rod. The rod and carriage are disposed within a boxlike
elongate enclosure fixed to the chassis whereby road contamination
cannot reach the rod and carriage. This box enclosure, as shown
particularly for structure to be described in connection with
canopy 23 includes a bottom panel 48, side panels 49 and 50, and a
top enclosing panel 51. The carriage 47 has a pair of rollers 52
which mount the carriage for guided movement in the enclosure and a
pair of cables 53 and 54 are connected to the carriage by
adjustable turnbuckles and extend outwardly of the enclosure. The
cable 54 passes about a sheave 55 pivotally mounted on the chassis
and, as shown in FIGS. 3 and 7, changes direction about a sheave 56
to extend upwardly and around a sheave 56a to then extend downward
and connect with the arm 32.
The cable 53 passes about a sheave 57 to change direction and
extend lengthwise of the chassis where it passes about a sheave 58
and then extends toward the side of the chassis and about a sheave
59 comparable in function to the sheave 56, which directs the cable
upwardly to pass around another sheave and then connect with the
arm 33.
The cylinder rod 46 is substantially extended when the canopy 24 is
in folded down, body-enclosing position. When the canopy is to be
raised, fluid under pressure is supplied to the rod end of the
cylinder to draw the rod into the cylinder and pull on the cables
53 and 54 which results in raising the inner ends of the arms 32
and 33 for movement along the guide slots 39 and 41, with the
result that the arms are raised and extended and move the canopy 24
outward. The canopy is releasably locked in lowered position and,
additionally, suitable locking structure is provided to hold the
canopy either in a horizontally extending position or an outwardly
and upwardly inclined position, as shown in the drawings.
The canopy 23 is mounted for movement and moved by structure, the
same as that described for the canopy 24, with one of the arms for
the canopy 23 being shown at 65 corresponding to the arms 32. The
operating arms for the canopy 23 are operated by a cylinder 66,
shown in FIG. 7, having the rod 67 and the carriage 68 connected to
cables 69 and 70, with the cable 69 passing about sheaves similarly
to the cable 54 and to the point of connection with the
canopy-operating arm 65. The cable 70 passes about sheaves
similarly to the previously described cable 53 to extend to the
rear of the chassis and about additional sheaves for connection to
an operating arm (not shown) for the canopy 23, corresponding to
the operating arm 33 of the canopy 24.
The canopies 23 and 24 each have a depending front flange 75 and
76, respectively. When the canopies are folded downwardly into
travel position, the flanges overlie a chassis flange as shown at
77 (FIG. 2) for the skirt 76, with this chassis flange protecting
the front flange from road contamination. In order to permit this
positioning, the front flanges each have a removable panel 78
which, when removed, defines a notch in the flange to fit around
the wheel guard 79, shown in FIG. 2.
With the operating structure disclosed herein for the canopies it
is possible to have unobstructed access to both ends of the
interior of the body. As shown in FIG. 2, a rear access can be
provided by relatively wide door structure, indicated generally at
80, in the rear wall 22, while front access can be provided through
a compartment at the front of the body 12. The body compartment
immediately to the rear of the truck cab provides a space for
various components, such as sound equipment and storage. A side
door (not shown) opens thereto. The guide slots 39 and 41 for the
operating arms 32 and 33 are formed in welded tracks which do not
extend across the width dimension of the body and, therefore, do
not limit the access openings.
Floor structure is indicated generally at 90 in FIGS 1, 2 and 3 and
includes an inner floor section 91 and an outer floor section 92.
The inner floor section is hingedly connected to the body by a
piano-type hinge 93 (FIG. 3) for pivotal movement about an axis
extending longitudinally of the body. The outer floor section 92 is
hingedly connected to the inner floor section 91 by a hinge of the
type shown in FIGS. 3 and 5, wherein a series of hinge members 94
are pivotally connected between the floor sections 91 and 92 and
with abutment, as indicated at 95, between the floor sections
maintaining a planar relation between the floor sections when
extended outwardly into an operative floor position, as shown in
FIGS. 1 and 3. With the floor sections so extended, they form a
continuation of an interior floor 96 which is fixed within the body
of the mobile center. The floor structures 91 and 92 are
constructed of welded beam members, as shown in FIG. 3, with a
suitable covering. A pair of the beam members have a pivotal
connection 98 therebetween for the rod 99 of an actuating means 100
in the form of a fluid cylinder. This cylinder is pivotally
connected at 101 to the chassis of the mobile center at a level
beneath the hinge 93.
A first series of outer legs 102 are pivotally connected to the
outer edge of the outer floor section 92 whereby they can lie
between the floor sections when they are folded in storage
position, as shown in FIG. 2, and which can extend to
ground-engaging position, as shown in FIG. 1. These legs are
adjustable in length to adapt to the contour of the surface with
which they are engaged. A second series of legs 103 are pivotally
connected to the inner floor section 91 near the outer edge thereof
for storage between the floor sections and for downward
ground-engaging position, as shown in FIG. 1, with these legs also
being adjustable in length as required for accommodation to the
contour of the ground.
After the canopy 24 has been raised to the position shown in FIGS.
1, 2 and 3, the floor structure is then in the position shown in
FIG. 2 and for extension thereof to operative position, the rod 99
of the cylinder 100 is retracted, which causes outward pivoting
movement of the inner floor section 91 which carries the outer
floor section 92 therewith. After a degree of outward pivoting of
the inner floor section 91, it is necessary for the outer floor
section to be manually engaged and pulled outwardly as the inner
floor section descends under its own weight and as controlled by
the circuit for the cylinder 100.
The floor structure when stored is tilted inwardly of the vertical;
however, the cylinder axis is not beyond the vertical.
A series of skirt members 110 can be fastened to the
floor-supporting legs 102 and 103 for decorative purposes and, in
transport, these skirts are fitted between the folded floor
sections 91 and 92 when they are in the position shown in FIG.
2.
The floor structure at the opposite side of the body is indicated
generally at 120 and is of the same construction as the floor
structure 90 and the operating means therefor is the same including
a power cylinder 121 shown in FIG. 8.
The hydraulic circuit for control of the canopy-operating cylinders
45 and 66 and the floor-operating cylinders 101 and 121 is shown in
FIG. 8, with the mechanism at each side of the body being operated
independently of the other and from a control station at the same
side of the body. Specifically, a control station for the canopy 24
and floor structure 90 and for control of the cylinders 45 and 100
has a control valve 130. This control valve is provided with fluid
under pressure from a pump 131 operated by a power source carried
by the mobile center and has an output line 141 which passes
unobstructively through valve 140 and extending to the control
valve 130 by line 132. A pair of manually operated valve members
are included in the control valve 130, with one of these manually
operable valves controlling flow to lines 133 and 134 connected to
opposite ends of the cylinder 45. The other manually operable valve
member controls the supply of fluid to lines 135 and 136 connected
to the floor-operating cylinder 100. Return flow to tank passes
through a line 137 leading to tank 138.
A control station for the canopy 23 and floor structure 120 and for
control of the cylinders 66 and 121 includes the master valve 140
having a supply line 141 and a line to tank 142. A first manually
operable valve member controls lines 143 and 144 connected to
opposite ends of the cylinder 66 and the second manually operable
valve member controls lines 145 and 146 connected to the
floor-operating cylinder 121.
With the structure disclosed herein, it is possible to have a
self-propelled, mobile center which can be driven to a particular
location and then set up for the desired use. For such setup, an
operator first unlocks the canopy at one side of the body and then
goes to the particular control station and with the pump operating
operates the power cylinder for raising the unlocked canopy. The
floor structure which normally is also locked for transport is then
unlocked by release of suitable locking structure and at the same
control station the valve is operated to supply fluid to the
floor-operating cylinder. During lowering of the floor, the outer
floor section 92 must be manually pulled outwardly to assist in
full extension of the floor structure. The same steps can then be
repeated for the canopy and floor structure at the opposite side of
the body.
When the mobile center is used as a stage, curtains 150 can be
positioned as shown in FIG. 1.
An alternate embodiment of the invention is shown in FIGS. 9 and 10
providing for a completely enclosed space, as shown particularly in
FIG. 10. In this embodiment, a canopy 224 extends outwardly from a
body, indicated generally at 212, and is disposed in a horizontal
plane and is constructed similarly to the canopy 24 of the first
embodiment and with the same structure provided for operation and
positioning thereof.
Similarly, a floor structure, indicated generally at 290 is
constructed similarly to the floor structure 90 and is mounted and
operated similarly to the floor structure 90. The total enclosure
is obtained by the use of an auxiliary sidewall 301 extending
lengthwise of the body and additional front and rear walls. At the
front there are vertically extending enclosing walls 302 and 303,
while at the rear there are similar vertically extending enclosing
walls 304 and 305.
This assembly of walls is associated in the manner particularly
shown FIG. 9 in full line wherein the canopy 224 has the auxiliary
sidewall 301 hingedly connected at 310 to the lower edge thereof,
as shown in FIG. 9, and which is the outer edge when the canopy is
extended to the broken line position shown in FIG. 9 by movement
indicated by the arrow 311. The auxiliary sidewall 301 is latched
to the canopy 224 by suitable mechanism, not shown, for holding
this auxiliary sidewall to the canopy as the canopy is extended.
After the floor structure 290 has been extended, the auxiliary
sidewall can be released. The floor structure 290 has the inner
floor section 320 hingedly connected at 321 to the body of the
mobile center and an outer floor section 322 hinged to the inner
floor section, similarly to the first embodiment. The inner floor
section 320 has the rear wall panel 304 hinged along the rear edge
thereof by a hinge 325 and the outer floor section 322 has the rear
wall panel 305 hinged along the rear edge thereof by a hinge 326.
The front wall panels 302 and 303 are similarly hinged to the front
edge of the floor sections 320 and 322. The front-to-rear length of
the floor structure 290 is at least twice the height of the wall
panels 302-305 whereby such wall panels can be positioned in a
storage position in end-to-end relation and parallel with the floor
sections, as shown in FIG. 9, while still permitting complete
vertical spanning of the space between the canopy and floor
structure when the wall structure is in operative position.
Suitable structure, not shown, can be provided for holding the
various panels in erected position.
In use of the embodiment shown in FIGS 9 and 10, the canopy 224 is
first moved outwardly to extended position and the auxiliary
sidewall 301 is retained in locked relation to the canopy. The
floor structure is then moved outwardly to a horizontal position,
as shown in broken line in FIG. 9. The auxiliary sidewall 301 can
then be lowered into position and the front wall panels 302, 303
and rear wall panels 304, 305 are then pivoted about their hinge
connections to the sections of the floor structure to an upright
position into engagement with the underside of the canopy 224 and
the parts are then locked into position. With this construction,
some extension of the canopy and floor structure lies beyond the
auxiliary sidewall 301 which can be provided as a porch or other
structure and with a suitable opening in the auxiliary sidewall 301
entry can be made into the enclosed space where a desired activity
may take place. A primary use of such self-propelled mobile center
would be as a portable medical laboratory which can be taken to the
desired location and then readily set up with an enclosed space for
the facilities required.
* * * * *