U.S. patent number 3,601,397 [Application Number 04/863,603] was granted by the patent office on 1971-08-24 for play center having table, swing, slide and gymnastic bars.
This patent grant is currently assigned to Gym-Dandy Gym-Dandy. Invention is credited to Edward T. Carlin, Bobbie L. White.
United States Patent |
3,601,397 |
Carlin , et al. |
August 24, 1971 |
**Please see images for:
( Certificate of Correction ) ** |
PLAY CENTER HAVING TABLE, SWING, SLIDE AND GYMNASTIC BARS
Abstract
A play center for home yard, patio, or recreation room use by
preschool and grade school age children designed and constructed to
encourage innovative play as well as conventional usage by such
children. The play center is a fabricated structure composed of six
main tubular frames; three novel platform assemblies providing a
table, associated bench seats and a slide approach platform; a
slide board; a swing; and variously disposed tubular cross braces
and wide step structures forming ground or floor engaging outrigger
members to prevent upsetting of the assembled unit, swing supports,
chinning and gymnastic bars, steps and seats. These fabricated
elements and subassemblies are joined together to form an assembled
unit of generally cubical configuration when viewed from the sides
and opposite ends and the ground or floor area, measuring roughly 3
feet by 7 feet, delimited by the main frame subassemblies which
cooperates with the main frame subassemblies, table and associated
benches to form a house area and tunnellike passage in innovative
usage by preschool children.
Inventors: |
Carlin; Edward T. (N/A, LA),
White; Bobbie L. (N/A, LA) |
Assignee: |
Gym-Dandy; Gym-Dandy
(LA)
|
Family
ID: |
25341384 |
Appl.
No.: |
04/863,603 |
Filed: |
October 3, 1969 |
Current U.S.
Class: |
482/36;
297/158.3 |
Current CPC
Class: |
A63B
9/00 (20130101); A63B 2208/12 (20130101) |
Current International
Class: |
A63B
9/00 (20060101); a63b 017/00 () |
Field of
Search: |
;272/60,56.5,57,62 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: OECHSLE; Anton O.
Assistant Examiner: Dror; Richard
Claims
What is claimed and desired to be secured by Letters Patent is:
1. A play center for preschool and grade school age children
designed to encourage innovative play activity comprising a tubular
skeletal structure composed of respective pairs of side and end
frame assemblies each formed of interconnected tubular support
runs, upstanding end runs, and top cross runs defining closed
skeletal shapes; means respectively interconnecting said frame
assemblies to define a generally rectangular skeletal frame
structure delimiting a play area wherein said end frame assembly
support runs are outwardly offset beyond the ends to stabilize the
play center against end tilting in use; a cross frame assembly
disposed substantially midway of said side frame assemblies and
having an upper cross run and oppositely extending end sections
disposed laterally outwardly of said side frames including inwardly
directed support runs terminating at and fixedly connected to said
side frame support runs and laterally spaced vertical runs disposed
outwardly of said respective side frame assemblies and extending
upwardly from said inwardly directed support runs and fixedly
connected to said cross frame upper cross run; means fixedly
interconnecting said laterally spaced vertical runs at said
respective ends of said cross frame assembly comprising vertically
spaced ladder rungs, said ladder rungs at one side extending the
full height of said cross frame assembly to provide access to the
top of said play center and provide a climber section and said
ladder rungs at said other side extending about one-half the height
of said cross frame assembly to provide access to a point midway of
the height of said play center, and means fixedly connecting said
innermost vertical run at each end of said cross frame assembly to
a respective side frame upper cross run to rigidify said laterally
outwardly disposed ends of said cross frame assembly and stabilize
the play center against side tilting in use; slide board means
including a slide board and a slide approach platform extending
longitudinally of said other side of said play center toward one
end of said play center, said slide approach platform having one
end fixed to said laterally spaced vertical runs and platform hand
rails fixed to said laterally spaced vertical runs at said other
side and to the adjacently related upstanding runs of said end
assembly at said one end of said play center and means fixedly
connecting said hand rails to said slide approach platform to
support the other end of said slide approach platform and the upper
end of said slide board of said slide board means; a swing
suspended from the top cross run of said one end of said play
center; an upper table platform and a pair of lower bench seat
platforms providing a bench seat alongside of and below each edge
of said table platform respectively; means fixedly connecting said
table platform and said pair of bench seat platforms in vertically
spaced relation to the upstanding end runs of the other end section
and the adjacently related upstanding end runs of said side frame
assemblies, the space between said bench seats and below said table
platform providing an open ended crawl tunnel passage.
2. The play center of claim 1 wherein said cross frame assembly
upper cross run is provided with a laterally directed truss member
having dependent end runs telescopically associated with the
adjacently related, innermost vertical runs of said cross frame
assembly and downwardly and inwardly inclined runs integrally
joined at their inner lower ends to a laterally directed run
fixedly connected to the midpoint of said upper cross run of said
cross frame assembly to strengthen said cross frame assembly
adapting it to resist compression forces transmitted to said upper
tubular cross run in use of the play center.
3. The play center of claim 1 wherein each of said ladder rungs
comprises an injection molded plastic member comprising an
elongated planar tread plate having dependent skirt portions along
its opposite longitudinal edges interconnected at equispaced points
at opposite sides of its longitudinal center by integral, laterally
directed reinforcing webs and said tread plate is formed at its
opposite ends with integrally formed, dependent annular sleeve
members diametrically end notched at their lower ends in alignment
with the longitudinal axis of the tread plate, the outer wall
surfaces of said sleeve member being formed to merge smoothly into
the outer faces of said dependent skirts and the inner wall surface
of which lying between the skirt ends is thickened throughout its
length at opposite sides of said longitudinal axis to reinforce the
line of juncture between each sleeve member and the tread plate and
to provide a tangential flat face providing full bearing engagement
with the abutment faces of the nuts of nut and bolt assemblies
provided to fixedly connect the respective sleeve members in
selected vertical position along the respective vertical runs
assembled in the respective sleeve through bores.
4. The play center of claim 3 wherein the outer face of each sleeve
member in surrounding relation to the notch in its lower end is
thickened to provide a tangential flat face segment providing full
bearing engagement with the abutment face of the bolt head of said
nut and bolt assemblies.
5. The play center of claim 1 wherein the top cross run of said one
of said end frame assemblies at equispaced distances from its
opposite ends is provided with a through aperture dimensioned to
freely pass the shank of an L-bolt and the upper wall only in
axially spaced relation to said through aperture is through drilled
to form an L-bolt locking passage, said suspended swing includes a
pair of straplike suspension members formed at their upper ends
with loops positioned to encircle said top cross run in overlying
relation between said through passage and said locking passage, and
said L-bolts have dependent locking lugs disposed to enter said
locking passages and threaded shank ends inserted through said
through apertures to dispose the elongated head of said L-bolt in
overlying relation to said positioned strap loops and are provided
with securing nuts which, when tightened, draw said elongated heads
firmly against said overlying portions of said loops forcing said
portions of said loops into clamped engagement with said top cross
run thereby fixing said loops against axial and rotational movement
relative to said top cross run.
6. The play center of claim 5 wherein said L-bolt shank between
said threaded shank end and said elongated head is bent inwardly at
its juncture with said elongated head at an acute angle and then
reversely bent to dispose its threaded shank end in centered axial
relation to said elongated head and said through aperture in said
top cross run is formed by an entry end and an exit end offset in
the direction of said locking passage to dispose said threaded
shank end in coaxial relation to the longitudinal center of said
elongated head whereby the securing nuts will be disposed
approximately midway between the edges of said straplike suspension
members so as to be housed by the loop to prevent accidental
contact of playing children with the nut.
7. The play center of claim 1 wherein said slide approach platform,
said table platform and said bench seat platform each comprise a
pair of support channel members disposed in laterally spaced
relation with their channel openings in opposed facing relation and
delimited along their upper edges by an inturned lip and delimited
along their lower edges by an inturned lip having longitudinally
spaced notches cut therein at predetermined intervals and a
plurality of platform channel members disposed in preselected
spaced relation lengthwise of said support channel members with
their channel openings facing downwardly, the ends of their web
portions formed with laterally spaced, upwardly directed button
punches engaged behind the inturned lip delimiting the upper edges
of the channel openings of said support channel members to fix said
platform channels against axial withdrawal from said opposed
support channel members, and their dependent channel forming
flanges disposed in preselected spaced notches of said support
channels to fix said platform channel members against relative
movement axially of said support channel members.
8. The play center of claim 7 wherein the web portion of each of
said support channel members adjacent its opposite ends is formed
with a bolt passage adapting said support channel members for
selective bolted connection to the respective upstanding runs of
said end frame assemblies at said other end of said play center and
to the respective adjacently related upstanding runs of said side
frame assemblies.
9. The play center of claim 8 wherein the platform channel members
of said slide approach platform and said table platform are
disposed in close side-by-side relation adjacent the longitudinal
center of said channel support members and the platform channel
members of said bench seat platform are disposed in widely spaced
relation adjacent the opposing ends of said channel support members
to properly relate the seats to the table platform.
10. The play center of claim 1 wherein said side frame assemblies
are each composed of a support run having upwardly and outwardly
inclined ends, a pair of upstanding side members having a straight
run telescopically fitted to and bolted to the upwardly and
outwardly inclined ends of said support run and an inturned upper
end lying in the plane defined by said support run and said
straight run and a wide inverted V-shaped run telescopically fitted
to and bolted to the inturned upper ends of said side members and
said end frame assemblies each comprise respective U-shaped support
runs the ends of which are inclined upwardly and toward the
respective opposed ends of said side frame assemblies, a pair of
upstanding members having a straight tubular run telescopically
fitted to and bolted to the respective upstanding inclined ends of
said support runs and a return bent upper end angled to abuttingly
engage and be bolted to the underside of the opposing straight
tubular runs of said respective side frame assemblies, said end
frame return bent run being shorter in length than its associated
straight tubular run, and a U-shaped top cross run having its end
portions telescopically fitted to and bolted to the return bent
upper ends of said related pairs of upstanding members.
Description
BACKGROUND OF INVENTION
For the past 30 years the play centers offered to the public have
generally employed a main frame of heavy tubular members formed by
a pair of end A-frames connected at their apexes by a tie bar
having straplike reinforcement members interconnecting its opposite
ends to the upper ends of the legs of the A-frame exemplified by
U.S. Letters Pat. No. 2,800,949 to I. Horowitz issued July 30,
1957. This main frame tie bar has served to suspendingly mount
swings, chain supported gym bars, gliders, and a device widely
known as a "Skyscooter" in side-by-side spaced relation and in some
cases these conventional main frames have had sliding board
assemblies mounted on the outer side faces on one of the end
A-frames. For the most part, the length, width, height, and tubular
size of these A-frame units have been designed of such magnitude to
assure structural strength and stability that the play centers have
been largely limited to yard usage because of their space
requirements and these units afford little, if any, play activities
other than that provided by the equipment suspended from the main
frame. As a consequence, the inherent "make believe" or innovative
nature of the children for which they are designed is not satisfied
by such play equipment and the children soon become tired or bored
with such play centers. In the past additional pieces of equipment
have been offered to satisfy the childrens' desire for climbing, a
play house, tunnelling, and picnic activity. The present
construction and the lighter weight tubular stock from which it can
be constructed with structural strength and stability required for
safety, provides for the first time a play center which may be set
up for use indoors as well as in the home yard and is offered for
use on covered patios, recreation rooms, or even spare rooms of
homes and apartments to afford play centers useful even in
inclement weather and a unit which may be readily moved from place
to place when desired. In addition, the single unit of the present
invention provides for climbing activities, picnic activities and
innumerable innovative activities such as tunnelling, play house
activities, a ranger lookout station, and the like.
SUMMARY OF INVENTION
It, accordingly is a primary object of this invention to provide a
childrens' play center which provides the children not only with
the usual swing, glider, sliding board, and gym bar activities but
a picnic area, a climber, and innovative activities such as play
house activities, lookout station activities, tunnelling and other
play activities which are generated in the seeking, imaginative
minds of children of the preschool and grade school age group.
Another important object of the present invention is to provide an
antitilt stabilized play center for children composed of a pair of
identical side frame members having support runs assuring line
contact with a support surface, a cross frame assembly
interconnecting the side frame members medially thereof and
providing outrigger, ground or floor engaging, lateral, stabilizing
runs providing line contact with said support surface laterally
outwardly of said side frame members, and respective end frame
assemblies interconnecting the side frame ends and providing
outrigger, ground or floor engaging longitudinal stabilizing runs
providing line contact with said support surface outwardly of the
opposite ends of said play center.
A further object of the present invention resides in constructing
the cross frame assembly above the outrigger stabilizing run at one
side with laterally spaced vertically extending tubular runs
connected at vertically spaced intervals with laterally directed
step members spaced vertically between the ground level and
midheight and a pair of laterally spaced, upwardly longitudinally
directed, generally U-haped support bars cooperating with the
laterally spaced vertical runs to support the upper end of a
sliding board and a sliding board approach platform.
Still another object of the present invention resides in
constructing the cross frame assembly above the outrigger
stabilizing run at the other side with laterally spaced, vertically
extending runs connected at vertically spaced intervals with
laterally directed step members spaced vertically between the
ground level and the upper tubular run of the cross frame assembly
to form a ladder providing climbing access to the top runs of the
cross frame assembly and the side frame members.
A further object of the present invention is to construct the end
frame assemblies provided to interconnect the side frame members
with a pair of axially related runs defining a wide V, the upper
run of which is axially shorter than the lower run and respective
U-shaped upper and lower crossmembers interconnecting said V-runs
through respective telescopically interfitted ends, the lower
ground engaging crossmembers being offset laterally outwardly
beyond the upper crossmembers to enable the upper crossmembers to
be used respectively as a swing support and/or chinning and gym bar
with the lower outward offset ground engaging crossmembers arranged
to provide line contact with a support surface operative to resist
the tilting forces of the play center when the swing moves
outwardly in its swinging movement or the upper crossmember is used
for chinning and gymnastic activities.
Another object of the present invention resides in providing a
novel strap connector for securing the upper loop end of a swing
support strap, rope or the like against relative axial and
rotational movement with respect to the upper run of the end frame
assembly.
Still another object of the present invention resides in providing
a novel platform assembly composed of a pair of opposed channellike
support rails and one or more channellike platform members fixedly
end fitted into the opposed channels of the support rails without
the need of separable fasteners of any kind.
A still further object of the present invention resides in mounting
a vertically spaced pair of platform assemblies formed according to
the previous object in vertically spaced relation to the lower runs
of one end frame assembly and the adjacently related end runs of
said side frame assemblies, the upper of said platform assemblies
comprising a pair of platform members adjacently centered with
respect to an opposed pair of support rails to form a table and the
lower of said platform assemblies comprising a pair of platform
members respectively connected to the adjacent opposed ends of a
longer pair of support rails to form respective bench type seats
extending in longitudinal parallelism to said table platform
members.
BRIEF DESCRIPTION OF DRAWINGS
Additional objects will appear from the following description and
appended claims when read in conjunction with the accompanying
drawings wherein:
FIG. 1 is a perspective view of a play center according to the
present invention showing several children playing, some indulging
in innovative activities encouraged by the novel unit of the
present invention;
FIG. 2 is an end view of the play center of FIG. 1 as viewed from
the left of FIG. 1;
FIG. 3 is an end view of the play center as viewed from the right
of FIG. 1;
FIG. 4 is a side view of the play center of FIG. 1 as viewed from
the side opposite that shown in FIG. 1;
FIG. 5 is a side view of one of the two main side frame assemblies
showing the manner of assembly thereof;
FIG. 6 is a front view of the cross frame assembly main frame
section the opposite vertical runs and the oppositely inturned runs
of which form a part of the outrigger stabilizing structure for
preventing side tilting of the play center;
FIG. 7 is an end view of one of the two end frame assemblies, the
lower cross run of which is offset to the right with respect to the
upper cross run as seen in FIG. 7 thereby adapting the end frame
assembly to serve as an outrigger stabilizing structure for
preventing end tilting of the play center;
FIG. 8 illustrates a tubular reinforcing frame assembly for
completing and reinforcing the cross frame assembly when associated
with the main frame section of FIG. 6;
FIG. 9 is a fragmental longitudinal sectional view through the end
frame upper cross run to illustrate the novel swing strap connector
of the present invention;
FIG. 10 is a view similar to that of FIG. 9 illustrating an
alternate strap connector clamp bolt provided to conceal the
threaded bolt end of associated nut midway within the upper end
loop of the swing strap;
FIG. 11 is a perspective view of the platform construction of the
present invention arranged with adjacently centered platform
members to form the table or slide approach platform of the present
invention;
FIG. 12 is a sectional view taken on the line 12--12 of FIG. 11 and
looking in the direction of the arrows to illustrate the axial
locking association of the button punch interlock formations of the
platform members with the inturned lip of the support rails and the
lateral locking association of the inturned lips of the platform
members with the opposing wall of the notches formed in the rolled
edge of the lower support rail flanges;
FIG. 13 is a top plan view of the novel wide tread, injection
molded, plastic ladder steps provided by the present invention to
assure ready assembly and final tightening of the round headed
securing bolts with the concealed nuts;
FIG. 14 is a front quarter section of the step of FIG. 13 to
illustrate the transverse reinforcing rib structure provided
between the depending front and rear walls of the step and the
thickened vertical reinforcing rib formed along the length of the
ladder rail sockets provided at the opposite ends of the steps;
FIG. 15 is a bottom plan view of the ladder step of FIG. 13;
FIG. 16 IS AN END VIEW AS seen from the right end of FIG. 13;
FIG. 17 is a sectional view taken on line 17--17 of FIG. 14 looking
in the direction of the arrows; and
FIG. 18 is a sectional view taken on line 18--18 of FIG. 14 looking
in the direction of the arrows.
DESCRIPTION OF PREFERRED EMBODIMENT
With continued reference to the drawings wherein the same reference
numerals are used throughout the several views to indicate the same
parts, the play center of the present invention comprises a
skeletal main frame 20 made up of a pair of identical side frame
assemblies 21 (FIG. 5), a single cross frame assembly 22 (FIG. 6),
a pair of identical end frame assemblies 23 (FIGS. 2, 3 and 7)
having ground engaging outboard cross runs stabilizing main frame
20 against endwise tilting, and a reinforcing truss assembly 24
(FIG. 8) forming with the end portions of cross frame assembly 22
in the final assembly of main frame 20 respective oppositely
laterally extending, outrigger frame sections stabilizing main
frame 20 against sidewise tilting. Assembled main frame 20 is
arranged to suspend a swing assembly 30 from the upper cross run of
a first end frame assembly 23; to support between the side runs of
the second end frame assembly 23 and the adjacently related end
runs of the two side frame assemblies 21 a multiuse platform
assemblage 27, 28, serving alternately as a picnic table-bench
unit, a crawl through play tunnel, a walk across stile, and a two
sided step ladder to gain access to the upper cross run of the
other end frame assembly 23 and the adjacently right angularly
related upper side frame runs designed for use as a chinning and
swing bar and parallel bars for performing gymnastic exercises; to
support between the outrigger frame section at one side and the
adjacently related runs of a first side frame assembly 21 and the
vertical side run of the first end section frame assembly 23 a
sliding board approach ladder, approach platform 26, and sliding
board 29 assembly; and to support between the vertical runs of the
outrigger frame section at the other side staggered wide tread
ladder steps 25 alternately used as a ladder to gain access to the
upper runs of main frame 20 used as a play lookout tower, tree
house or the like with the wide tread steps being also used as
seats when playing imaginative games of war, cowboys and indians,
forest rangers, and the like. Each of the frame assemblies 21, 22,
23 and 24 are formed of angularly related runs of tubular pipe
stock the ends of which are adapted to be telescopically connected
and fixedly bolted together by the purchaser so the parts may be
boxed and shipped in knocked down form to conserve shipping space
and minimize shipping and handling costs. These various units may
be selectively dimensioned to serve the needs of children of
preschool age or older. In either case the construction of the
overall structure as well as the respective frame assemblies will
be identical except for pipe stock sizes and dimensions, larger and
heavier pipe stock being used in the larger size units to assure
adequate strength and safety. The following detailed description
will be directed to a preschool age play center the dimensions
given being exemplary only.
Referring for the moment to FIG. 5 illustrating in detail one of
the two side frame assemblies 21 required, a generally U-shaped
ground engaging member 32 having a ground engaging straight run 33
of approximately 11 inches in length and upwardly divergent
straight runs 34 of approximately 121/4 inches in length integrally
joined by curved transition sections 35 defining respective
included angles of 120.degree. (See angle A) is provided. The upper
end of each divergent run 34 is telescoped into a respective long
leg 36 of an inverted generally L-shaped member 37 and through
bolted thereto as indicated at 38 by a bolt and nut assembly
preferably comprising a rounded kerfed bolt head and a cap nut to
minimize exposed sharp corners and edges that might scratch and cut
the playing children. The short leg 39 of each member 37 defines
with its related long leg 36 an included angle of 80.degree. (See
angle B) and is integrally joined thereto by a curved transition
section 41. The straight run of long legs 36 is roughly 42 inches
and the straight run of the short legs 39 is roughly 8 inches. The
oppositely inwardly directed short legs 39 telescopically receive
the opposite ends of an inverted wide V-shaped cross tubular member
42 defining an included angle of 140.degree. (See angle C) having
its inserted ends and the enclosing ends of legs 39 vertically
through drilled at 40 (FIG. 5) adapting them to receive bolt and
nut assemblies of the type heretofore described. As best seen in
FIG. 5, the curved transition section of tubular member 42 is
horizontally through drilled at 43 for bolted connection to frame
assembly 24 as will be hereinafter described. The straight run 33
of member 32 is also vertically through drilled at 44 midway of its
ends for bolted connection to the ground engaging runs of frame
assembly 22 as will presently appear. While the dimensions and
angles of side frame assemblies 21 may be varied to provide larger
play centers, the dimensions and angles given provide side frame
assemblies 21 having an overall height of about 5 feet 2 inches
adequate to provide a play center of about 7 feet total height.
Referring next to fig. 6, illustrating in detail the main frame
section 49 of the cross frame assembly 22, it will be seen that
main frame section 49 is composed of an upper straight run 51 the
opposite ends of which are telescoped into the ends of respective
right-angled corner members 52 and are through bolted to the
horizontal run thereof at 38 by bolt and nut assemblies of the type
heretofore described, a pair of respective vertical runs 53 having
their upper ends telescoped into the respective vertical runs of
corner members 52 to which they are through bolted at 38 to the
respective vertical runs of a pair of ground engaging right-angled,
corner members 54 as will presently appear. The horizontal runs of
members 54 terminate in opposingly spaced free ends 55 which are
flattened out, upwardly arched and through drilled vertically
adapting them to overly and be through bolted at 38 (FIG. 1) to the
midpoint of the ground engaging straight run 33 of the respective
side frame assemblies 21 by nut and bolt assemblies of the type
previously described in the final assembly of the play center. The
upper straight run 51 of the main frame section 49 is horizontally
through drilled at 56 at its midpoint adapting it for through
bolted connection to the cross truss member of reinforcing truss
assembly 24 of FIG. 8 which will be presently described. The
horizontal runs of ground engaging corner members 54 are also
horizontally through drilled inwardly from free ends 55 at
equispaced points 57 adapting the corner members 54 for bolted
connection to the ground engaging members of reinforcing truss
assembly 24 to be presently described. The upper right end corner
member 52 of main frame section 49 is further through drilled at 58
adapting it for bolted connection to the reinforcing truss assembly
24 as will presently appear. The tubular elements 51 and 53 for the
small dimensioned play center here illustrated are respectively
given an axial length to assure an overall height of 681/2 inches
and an overall width of 7 feet 21/2 inches to the main frame
section 49 while the ground engaging runs of corner members 54 are
of a length to dispose free ends 55 to be connected to side frame
runs 33 an equal distance of about 223/4 inches inwardly of the
respective vertical runs 53 of main frame section 49. This
dimensioning of main frame section 49 assures an adequate lateral
extension of main frame section 49 beyond the side frame assemblies
21 to form outrigger reinforcing frame sections and above the side
frame assemblies 21 to respectively resist sidewise tilting of the
play center as finally assembled and a truss structure, when
assembled with truss assembly 24, that will rigidly support the
side frame assemblies 21 in predetermined laterally spaced
relation; about 29 inches in the small play center depicted.
Referring now to the truss assembly 24 of FIG. 8, it comprises a
pair of identical U-shaped ground engaging members 61 the legs of
which extend vertically to respectively receive a pair of
equilength vertical runs 62 and a third vertical run 62 and a half
length vertical run 63 the lower ends of which telescope into legs
of the respective ground engaging members 61 and are through bolted
thereto as indicated at 38 by nut and bolt assemblies of the type
heretofore described. Truss assembly 24 is completed by telescoping
the ends of respective ladder steps 25 onto vertical runs 62--62 in
laterally staggered, vertically spaced relation and to vertical
runs 62-63 in laterally staggered, vertically spaced relation as
depicted in FIG. 8 and telescopically inserting the upper ends of
the innermost vertical runs 62 into the dependent legs 64 of a
cross truss member 65 and through bolting the telescoped ends
thereto as will presently be pointed out. Preferably the steps are
through bolted in their final vertical locations by nut and bolt
assemblies 60 entered through laterally aligned passages 57 formed
in the lower ends of steps 25 and vertical runs 62-63 as shown in
FIG. 14. Each of the ground engaging members 61 are through drilled
at 57 at laterally spaced intervals to match the through drilled
openings 57 of the ground engaging members 54 of main frame section
49, which are preferably through bolted to members 61 prior to
assembly of vertical runs 57 of the main frame section 49 as shown
in dot-dash lines in FIG. 8. Cross truss member 65 is formed with
downwardly and inwardly inclined runs 66 defining with the
dependent legs 64 an included acute angle having their lower ends
integrally joined with a straight cross run 67 through drilled
midway of its length at 57 for a purpose to be presently pointed
out. The included angle defined by runs 66 and the length of runs
66 and vertical runs 62 are so chosen as to assure that straight
run 67 will lie in adjacent side-by-side relation to upper straight
run 51 of main frame section 49 upon completing the cross frame
assembly 22 as will now be described.
Partially assembled main frame section 49 (lacking corner member 54
previously through bolted to members 60 of truss assembly 24) is
assembled with truss assembly 24 by entering the lower ends of runs
53 through the free ends of the outermost laterally outwardly
disposed steps 25 and inserted into the upstanding legs of the
respective corner members 54 and through bolted thereto at 38 (See
FIG. 1 and 6). In this partially assembled relation the center
through drilled passage 56 of upper straight run 51 will align with
drilled passage 57 in the straight run 67 of cross truss member 65
enabling the run 51 and truss member to be through bolted together
as indicated at 38 in FIGS. 1, 2, and 3. At the same time the inner
most through drilled passages in the horizontal run of corner
members 52 will align with the through drilled openings 57 in the
telescoped ends of innermost runs 62 and dependent truss member
legs 64 enabling these three parts to be through bolted together at
38 as indicated in FIGS. 1, 2, and 3 to complete cross frame
assembly 22. It will be appreciated from the preceding description,
that the lateral outrigger ends of cross frame assembly 22
constitute rigid reinforced end sections interconnected by an
equally rigid cross run 51 as a result of the three bolted
connections of truss member 65 and the bolted interconnection of
cross run 51 and the outermost full height vertical run 62 as seen
at the right side of FIGS. 1 and 2.
This reinforcing cross frame assembly 22 is then raised to its
upstanding position as seen in FIGS. 1, 2 and 3 and the side frame
assemblies 21 previously described are then respectively set in
position with ground engaging runs 33 beneath the arched ends 55 of
corner members 54 and the midpoint of side frame cross tubular
member 42 crossing and abutting the inner face of the respective
innermost vertical runs 62 of truss assembly 24 which are through
drilled at the point of cross adapting the cross tubular member to
be through bolted thereto as indicated at 38 in FIGS. 1, 2 and 3.
The free ends of arched ends 55 of corner members 55 are then
through bolted to the respective runs 33 of the side frame
assemblies 21 as indicated at 38 in FIG. 1 to complete the assembly
of side frame assemblies 21 and cross frame assembly 22.
Side frame spacer struts 71 having flattened and upwardly arched
ends 55 are then through bolted at 38 respectively to cross tubular
member 42 using the vertical through drilled passages 72 (FIG. 5)
and the through drilled ends 55 of struts 71 to fix the lateral
spacing of the side frame assemblies 21.
Further fixing of the spacing of side frame assemblies 21 and
rigidification of the side frame assemblies is effected by the pair
of end frame assemblies 23 (FIG. 7) which will now be described in
detail. These end frame assemblies are of identical constructure
and each comprise a U-shaped ground engaging member 75, an upper
U-shaped crossmember 76 and a pair of wide V-shaped tubular side
runs 77 defining an included angle of about 120.degree.. The leg
portions 78 of the U-shaped members 75 and 76 telescope into the
opposite ends of the side tubular runs 77 and are respectively
through bolted together, the legs of member 75 at the right end
being through bolted together as indicated at 38 in FIGS. 1 and 7.
U-shaped members 75 and 76 are designed so that their respective
legs will be spaced apart about 29 inches adapting them to impart
to side tubular runs 77 a relative lateral spacing equal to that of
the side frame assemblies previously described. The straight run 79
of each side tubular run 77 is about 2 feet in length while the
upper straight run 81 of each side tubular member 77 is about 14
inches thereby assuring that the ground engaging straight run of
each member 75 will be offset outwardly beyond the straight run of
its associated upper crossmember 76 as indicated by the dot-dash
line 82 of FIG. 7 for a purpose to be presently pointed out.
Each of the straight runs 81, about 1 inch and about 10 inches
inwardly from its free end, is through drilled in the plane defined
by the axes of its respective straight runs 79 and 81 to mate with
similarly spaced drilled passages provided in the straight runs 36
of side frame assemblies 21 adjacent their inner ends adapting the
side tubular runs 77 to be through bolted at spaced points 38
(FIGS. 1, 2, and 3) to under sides of the runs 36 of side frame
assemblies 21. The upper bolted connection in each case also
secures the telescoped ends of side tubular runs 77 to the
associated leg portions 78 of upper crossmember 76. This bolted
connection of end frame assemblies 23 with side frame assemblies 21
disposes runs 79 and 36 of the respective end frame assemblies and
side frame assemblies in downward divergent relation as best shown
in FIG. 1 with the straight run of each ground engaging member 75
contacting the ground or other support surface a substantial
distance outwardly of the upper crossmember 76. As a consequence,
end frame assemblies 23 in addition to fixing and rigidifying the
spacing of side frame assemblies 21 also prevents end tipping of
the play center in use.
It will be appreciated from the preceding description that the play
center frame 20 in its assembled condition not only delimits a play
area on the ground or other support surface but defines skeletal
side and sloping top walls defining a play space above the ground
play area which can, by use of suitable cover and wall materials,
such as canvas or plastic sheeting, form a play house when desired.
At the same time this skeletal frame 20 provides a stable, tilt
resisting, support structure capable of use as a climbing and
gymnastic workout structure, as a lookout or ranger tower and as a
support for swings, a sliding board, a picnic table and bench set
which also provides a stilelike step ladder and crawl tunnel, and
many other play activities which the imaginative child will
conceive.
To provide these further play activities, the present invention
contemplates that the steps 25 be of unique construction to serve
as seats as well as steps, that the upper cross member 76 of the
end frame assemblies be formed to fixedly support strap or ropelike
swing supports, that one of the outrigger sections providing steps
for the full height provide a ladder for climbing or access to the
top of the structure, that the other outrigger section providing
steps for half the height provide an access ladder to slide
approach platform and slide fixedly mounted to the outrigger
structure and adjacently related outer sides of the side and one
end frame assembly to serve also as a counterbalancing weight to
resist tilting forces due to use of the crossbar of the opposite
end assembly as a chinning and swing bar, and that the area defined
by the divergent runs of the other end frame assembly and the
adjacently related ends of the side frame assemblies provide a
support for table-bench platform structures which provide a crawl
through tunnel, a stilelike step ladder providing access to the
crossbar of the other end frame assembly, and a counterbalancing
weight to resist tilting forces due to use of the swing suspended
from the upper crossbar of the opposite end frame assembly as well
as a picnic table and benches. FIG. 1 depicting a group of children
turned loose and unobtrusively photographed while using the play
center of this invention clearly illustrates some of the innovative
play activity engendered by this invention.
Referring for the moment to FIGS. 9 and 10 of the drawings, there
are illustrated in cross section two similar swing suspension
structures which this invention contemplates. In both cases, the
sectioned tubular member 91 comprises the straight upper cross run
of one of the crossmembers 76 of an end frame assembly 23. Tubular
crossmember 91 at laterally spaced points 92 (See FIG. 3) is
through drilled at 93 through the upper wall only (FIG. 9) and
through drilled outwardly from passages 93 through both walls to
from aligned passages 94 (FIG. 9) adapted to freely pass the
straight shank 95 of a rodlike L-bolt the shank end 96 of which is
threaded to receive a nut 97, preferably a domed nut to house the
sharp thread edges. The free head end of the L-bolts is provided
with a dependent lug 100 fitted into the passages 93 to fix the
bolt head against lateral movement relative to crossmember 91. The
swing suspension member, a straplike fabric member, providing an
attachment loop 98 by stitching its turned back free end crosswise
at 99 to an axially spaced area, is telescoped over the free ends
of crossmember 91 before the end frame assembly 21 is assembled.
After assembly, the loop 98 is positioned in overlying encircling
relation to the portion of crossmember 91 lying between passages 93
and 94 and the shank 95 of the L-bolt is passed through passages 94
to dispose the rodlike head 101 in overlying clamping relation to
the loop 98. Upon applying nut 97 and threading it home, head 101
will be drawn tightly down upon the underlying portion of loop 98
clamping the loop portion between the covered portion of
crossmember 91 and head 101. Since all surfaces contacting the
fabric loop 98 are smooth and rounded and of substantial area, the
clamped section of loop 98 will be firmly fixed against both axial
and rotational movement relative to tubular member 91 and swinging
will merely flex the free portions of the straplike members back
and forth. Little or no wear will be experienced assuring a long
useful life of the suspension strap.
The structure of FIG. 10 is substantially the same and the common
parts have, therefore, been given the same reference number. The
sole difference is that tubular member 91 is drilled to form an
entrance passage 94 through the upper wall and the exit passage 94
in the lower wall is through drilled midway between recess 93 and
entrance passage 94 to provide a slightly elongated passage 102 and
shank 95 is bent inwardly at 103 and then return bent at 104 to
dispose its threaded shank end 96 in laterally centered relation to
rodlike head 101. In this form of the invention, the shank 95 is
threaded through passage 94 then canted to pass its thread shank
end 96 into and through elongated passage 102 until the L-bolt
assumes the position shown in FIG. 10. This construction places the
nut 97 in housed relation between the two open sides of loop 98
minimizing the possibility of injury should a child hang by his
hands from and swing on tubular member 91 or in playing passes his
head under crossmember 91 near loop 98.
Referring now to FIGS. 13 and 18, detailing the ladder steps or
rungs 25 designed for use as seats as well as ladder steps or
rungs, each step 25 comprises a one piece injection molded
structure designed to provide a tread plate 111 of maximum width
(27/8 inches) along its lateral center tapering toward its opposite
ends where it merges into the top ends of right angularly related,
dependent, elongated, sleevelike, tubular mounting formations 112
having peripheral curved sidewalls 113 (FIG. 13) comprising arcs of
a circle having a radius of 9/16 inches into which the tread plate
edges merge at a tangent. This unique tread plate shape provides a
central seating area of substantial width flanked on either
side-by-step areas 114 (FIG. 13) of reduced width disposed adjacent
the mounting formations 112 which are conveniently disposed (See
FIG. 2) for use as stepping areas in ascending and descending using
either the center run 62 or 63 or adjacently related runs 62--62,
62-53, 63-62, or 63-53 as hand hold ladder rails.
Tread plate 111 is rigidified by the provision of integrally formed
depending skirts 115 along the edges of tread plate 111 merging
tangentially at their opposite ends into curved sidewalls 113 of
mounting formations 112 as indicated at 116 in FIG. 15 and
respective axially spaced pairs of crosswebs 117 equidistantly
spaced from the midpoint of treadplate 111 and crosswebs 118
equidistantly spaced from crosswebs 117 as best seen in FIG. 14 and
15.
The outer wall face of each mounting formation 112 lying between
the outer ends of dependent skirts 115 is provided with a full
length thickened rib 119 providing a flat face 121 for abutting
contact with the securing nut of nut and bolt assembly 60 while the
opposing outer wall face in surrounding relation to the through
aperture 57 is provided with a thickened boss 122 providing a
similar flat face 121 for abutting contact with the opposing flat
face of the bolt head of nut and bolt assembly 60. As a result of
this rib and boss construction a wide gripping area of the tubular
runs 62, 63, 53 underlying the bolt head and nut is assured when
the bolt and nut assembly is tightened thereby positively fixing
each step or rung 25 in its selected vertically spaced relation.
Preferably, the upper face of tread plate 111 as its center is
formed with a depressed recess 123 for receiving the manufacturer's
trademark or like identification (not shown) and the area outside
of recess 123 is formed with a hobnail tread 124 (FIGS. 13 and 14)
to assure a nonslip tread surface. The lower edge of skirts 115 is
thickened at the center and to a progressively lesser degree
outwardly toward each end as indicated at 125 (FIGS. 13, 16, 17,
and 18) to better resist sidewise blows from the children's feet
when using the steps or rungs 25 as a ladder.
While the slide board approach platform 26 and table and bench seat
platforms 27 and 28, may be variously constructed, the present
invention contemplates a novel construction which may be
preassembled without the need of separable fastener elements for
unitary installation. While this novel platform structure is here
shown for use in providing slide approach platform 26, table
platform 27 and bench seat platform 28, it is to be understood that
the construction is of general utility and may be employed to form
platforms adapted for any desired use. For example, the platform
construction may be employed to form seats and foot platforms for
home yard, and porch gliders, for bench seats designed for general
use, and for picnic and table structures of general utility.
As will appear from a consideration of FIGS. 11 and 12 of the
drawings detailing the table platform 27, each platform comprises a
pair of identical platform support channels 131 and a pair of
platform channels 132, which, in the case larger surface areas or
abutting surface areas are desired, can be multiplied as
desired.
Referring for the moment to support channels 131, each support
channel comprises a channel member of a preselected length
comprising a pair of spaced flanges 133 and 134 interconnected
along adjacently related sides by an integrally formed web 135
through drilled at 136 adjacent the opposite ends adapting support
channel 131 for bolted connection at 38 (FIG. 1) to frame runs 36,
79 in the case of platforms 27 and 28 and to runs 53, 62 and the
slide board hand and support rails 137 in the case of platform 26.
Through drilled openings 136 will be omitted, of course, in cases
where such a bolted connection is not required or will be relocated
in other selected locations along web 135 where a different bolted
connection is required.
As best seen in FIG. 11, the free ends of flanges 133 and 134
terminate in vertically spaced aligned relation and are
respectively provided with an inturned, slightly spaced, return
bent lip 138 and an inturned rolled lip 139. Rolled lip 139 is
suitably notched at longitudinally spaced intervals as indicated at
141 or a double width notch as indicated at 142 in place of the two
inner notches 141 for a purpose to be presently pointed out.
Still referring to FIG. 11, platform channels 132 each comprise a
channel member of a preselected length comprising a pair of spaced
flanges 143 and 144 interconnected by a wide web 145 the center
areas of which may, if desired, be embossed as indicated at 146.
The free ends of flanges 143 and 144 are provided with an inturned,
slightly spaced, return bent lip 147 the thickness and spacing of
which is designed together with the thickness of the respective
flanges to freely fit within the notches 141 of support channels
131 as shown in FIG. 12 with the outer flange faces lightly
abutting the opposing notch edges thereby fixing the platform
channels against lateral shifting movement relative to support
channels 131. In event a solid platform surface area rather than a
divided platform surface area is desired then a pair of platform
channels 132 having respectively wider webs 145 would be selected
so the adjacently related faces of flanges 143 and 144 could be
face butted in notch 142 as shown in dot-dash lines in FIG. 12.
Webs 145 at laterally spaced points inwardly from their opposite
ends are likewise button punched as indicated at 148 to form
upstanding interlock formations providing an upwardly semispherical
wall facing toward the respective opposite ends of web 145 and a
diametrically laterally disposed abutment edge 149 facing toward
the center of webs 145. The inward spacing of these button punched
interlock formations 148 is preselected so that the axial distance
of abutment edges 149 inwardly from the adjacently related ends of
webs 143 will approximate but not exceed the distance between the
inner face of webs 135 and the inturned free edge of lips 138 of
support channels 131. This is done so that axial insertion of the
respective ends of webs 145 into notches 141 or 141 and 142 of the
respective support channels 131 will result in a momentary camming
engagement between the semispherical wall of the interlock
formations and the opposing surfaces of lips 138 raising lip 138
toward its support flange 133 followed by a snapping back of lip
138 to its normal spaced position as abutment edges 149 pass
inwardly of the free edge of lip 138. Once this insertion is made
axial retracting movement of the platform channels 132 from support
channels 131 can be accomplished only by destructive deformation of
the portions of lip 138 in the area of the interlock formations. It
follows, therefore, that a permanent interlocked assembly of the
support channels 131 and platform channels 132 is assured by this
novel platform construction without the aid of separable
fasteners.
Once the preassembly of platforms 26, 27 and 28 is effected, these
respective platforms are assembled as a unit onto skeletal frame 20
by through bolting their respective support channel ends as shown
at 38 in FIG. 1 to frame runs 53 and 62 in the case of platform 26
with the upper end of frame run 63, which is flattened out as shown
at 150 (FIG. 8), adapting it to be abuttingly clamped behind the
adjacently related dependent flange 143 of the end mounted platform
channel 132 as shown in FIG. 1 and to frame runs 36 and 79 as shown
at 38 in the case of platforms 27 and 28 as also shown in FIG. 1.
The opposite end of slide approach platform 26 together with the
upper end of slide board 29 are then through bolted to the straight
runs 151 of hand rails 137 as shown at 38 in FIG. 1. The upper ends
of the return bent runs 152 of hand rails 137 are then through
bolted as shown at 38 in FIG. 1 to frame runs 53 and 62 in
vertically spaced crossing relative above platform 26 while the
lower ends of straight runs 153 of hand rails 137 are through
bolted to frame runs 53 and 62 in cross relation at 38 using the
same bolt and nut assemblies used to secure the telescoped ends of
runs 53 and 62 to the upstanding legs of the adjacent frame corner
members 54 and adjacent U-shaped member 61 as seen at the lower
right corner of FIG. 3. The lower end of slide board 29 is
supported in spaced relation to the ground or other support surface
by U-shaped support member 154 the upper leg ends of which are bent
over and telescoped into the rolled slide board side rails 155.
The exposed ends of support channels 131 are preferably fitted with
triangularly shaped, plastic, protective cups 159 the walls 161 of
which are through drilled at 162 to align with passages 136 of
support channels 131 adapting the caps to be fixed in place with
walls 161 clamped between the channel webs and the opposing frame
runs to which they are bolted. Similar protection is provided for
the free ends of crossing tubular runs by cylindrical plastic cup
members 163 (FIG. 1).
The invention may be embodied in other specific forms without
departing from the spirit or essential characteristics thereof. The
present embodiment is therefore to be considered in all respects as
illustrative and not restrictive, the scope of the invention being
indicated by the appended claims rather than by the foregoing
description, and all changes which come within the meaning and
range of equivalency of the claims are therefore intended to be
embraced therein.
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