U.S. patent number 3,704,849 [Application Number 04/860,250] was granted by the patent office on 1972-12-05 for boltless gym set.
Invention is credited to Martin Green.
United States Patent |
3,704,849 |
Green |
December 5, 1972 |
BOLTLESS GYM SET
Abstract
A gym set having boltless joining members wherein one member
interlocks into the other through gravity friction. This frame
construction has plays that are connected to the top horizontal bar
of the frame structure, the top bar of the structure having a
minimum number of holes for receiving plays, thus allowing for a
lighter gauge tubing while at the same time providing a stronger
member. The end of one member of the structure having tapered,
reinforced ends for insertion within a complementary opening in
another member to provide tightening at the interlocked joint of
the two members while in use. The top bar having reinforced members
extending from its center to its ends, thus eliminating the need of
an additional two legs for center support.
Inventors: |
Green; Martin (Mahwah, NJ) |
Family
ID: |
25332802 |
Appl.
No.: |
04/860,250 |
Filed: |
September 23, 1969 |
Current U.S.
Class: |
248/165; 29/445;
29/516; 182/151; 248/163.2; 248/370; 403/217; 403/347; 472/118;
182/181.1 |
Current CPC
Class: |
A63B
9/00 (20130101); Y10T 403/44 (20150115); Y10T
29/49861 (20150115); A63B 2208/12 (20130101); Y10T
403/7003 (20150115); Y10T 29/49927 (20150115) |
Current International
Class: |
A63B
9/00 (20060101); F16m 011/32 () |
Field of
Search: |
;248/163,165,370,440,340,341 ;287/54A,54B |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Parsons, Jr.; Marion
Claims
What is claimed is:
1. A gym set comprising a top bar, leg means for support of said
top bar and a plurality of play supports connected to said top bar,
said top bar having holes at its upper portion for receiving said
play supports, said play supports including hooked ends for
insertion within the holes of said top bar and supported thereby,
said leg means includes a first leg and a second leg, said first
leg having a tapered end and said second leg having a tapered end
with a slot formed therein of a complementary predetermined size to
receive the tapered end of said first leg and thereby forming a
crossing therewith and further, wherein said top bar having slots
of a complementary predetermined size to receive the tapered ends
of said first leg and said second leg resulting in a gravity
friction connection between said first leg and said second leg, and
a gravity friction connection between said mentioned legs and said
top bar as the gym set is used.
2. The structure defined by claim 1 wherein said first leg and said
second leg of said leg means are each formed of an elongated tube
having open ends and said structure further comprises a sleeve for
insertion at one end of said first leg and said second leg and
wherein said ends are flattened to produce reinforced tapered ends
for insertion within the slots of said top bar.
3. The structure of claim 1 wherein said top bar comprises a pair
of horizontal pieces coaxially connected at one end thereof at the
center of said top bar and an overhanging trestle supporting the
center of said top bar at the connection of said two horizontal
sections and extending to interconnect the legs at the connection
of said legs with said top bar.
4. The structure of claim 3 wherein said trestle comprises a
vertical bar threaded through the center of said top bar at the
connecting ends of said two pieces and extending upwardly thereof,
and a pair of opposed bars extending from the top of said vertical
bar to the connection of said legs with said top bar, and inserted
within the crossings of said legs and held in place thereby by said
trestle structure supports.
5. The structure of claim 4 wherein the ends of said pair of
opposed bars are of tapered triangular configuration
interconnecting said legs and said top bar at the crossings of said
legs.
6. The structure of claim 4 further comprising end bars extending
from the free ends of said top bar, and said end bars including
ends of tapered triangular configuration for firmly wedging between
the crossings of said legs, said end bars being adapted for use
with an additional play supports at the ends of said top bar as
needed.
Description
BACKGROUND OF THE INVENTION
Heretofore gym sets necessitated the use of a multiplicity of nuts
and bolts in the assembly of the structure and the plays on said
structure. In addition, it necessitated drilling through the
members of the structure to connect them to each other and to
connect the plays thereon, which, in turn, necessitated the use of
heavier gauge members.
Because of a large number of parts, complicated instructions had to
be followed by the consumer which made it difficult to assemble a
gym set. The large number of different size nuts and bolts resulted
in the improper fitting of the structure members and the plays upon
them. More difficult was the fact that if any of the parts were
missing a large percentage of users wasted the jobber's time in
requests for delivery of these parts and further, the large number
of different sizes of nuts and bolts presented the problem of
misfits, thereby causing dissatisfaction among customers which
resulted in the factory receiving many complaints, which again
caused loss of time for the jobber in replacing parts.
Further, gym sets heretofore presented insurance problems since the
exposed edges of the bolt ends would scrape children's bodies.
Additional problems were encountered when, in tightening the bolts,
the top bar would flatten in the direction of loading, thus
reducing its strength.
Further, a conventional gym set frame holding, for example, six
plays necessitated a longer top bar, thereby requiring two
additional legs for center support. The two extra legs for support
of the longer top bar produced an obstruction in the use of the gym
set. Eliminating these two legs would permit an additional play to
be installed in their place.
BRIEF SUMMARY OF THE INVENTION
This invention relates to physical fitness frame structures and,
more specifically, to a gym set having boltless joining members
wherein one member interlocks into the other through gravity
friction. The present invention is basically constructed to provide
a boltless frame structure and, in addition, it presents a means of
attaching a plurality of plays to the top bar of the frame
structure.
Therefore, an object of this invention is to provide a frame
structure that can be constructed with lighter gauge tubing while,
at the same time, providing a stronger member.
Another object of this invention is to provide a boltless structure
that includes interlocking joints that are tightened while in use
through gravity friction.
Another object of this invention is to provide a frame for a gym
set that can be manufactured with fewer parts inexpensively and can
be readily assembled and disassembled.
A further object of this invention is to provide for a gym set
having a top bar that is longer than the top bar of a conventional
gym set while eliminating the two center legs.
An additional object of this invention is to provide for a gym set
having component parts with fewer holes punched or drilled through
so that lighter gauge metal tubing can be used.
Other objects and features of the invention will appear as the
description of the particular physical embodiment selected to
illustrate the invention progresses. In the accompanying drawings,
which form a part of the specification, like characters of
references have been applied to corresponding parts throughout the
several views which make up the drawings.
DRAWINGS
FIG. 1 is a perspective view of a preferred embodiment of the
invention;
FIGS. 2, 3, 4, 5, and 6 are side views of members of the invention
in the process of their manufacture;
FIG. 7 is a side view of another member of the invention;
FIG. 8, 9, and 10 are views showing the end of the top bar in the
process of its manufacture;
FIG. 11 is a perspective view of the end of the top bar in its
assembly;
FIG. 12 is a sectional view taken along lines 12--12 of FIG.
11.
FIG. 13 is a sectional view of the interlocked joint of the top bar
and the interlocked legs of the invention;
FIG. 14 is a perspective view of FIG. 13 with the top bar
removed;
FIG. 15 is a sectional view of the chin bar interlocked joint;
FIG. 16 is a sectional view of another embodiment of FIG. 15;
FIG. 17 is a side view of the joint of FIG. 15 with the leg
partially broken to show details;
FIG. 18 is a side view of an attaching means of one of the
plays;
FIG. 19 is a perspective view of an attaching means for another
play;
FIG. 20 is a side view showing the attaching means of FIGS. 18 and
19 assembled with the top bar of the invention;
FIG. 21 is a side sectional view showing one of the plays in
operation;
FIGS. 22 to 24 show a second embodiment of the invention;
FIG. 25 is an end sectional view showing details taken along lines
25--25 of FIG. 22;
FIG. 26 shows a further embodiment of the invention;
FIG. 27 shows an additional embodiment of the invention; and,
FIGS. 28 to 30 show embodiments of the invention with slight
variations.
DETAILED DESCRIPTION
In the drawing, typical applications of the present invention are
shown. It is to be understood that the present invention has
application to any structures wherein the members are interlocked
and held by gravity friction and further, in that the members are
joined closer together while in use.
Referring to FIG. 1, a gym set 10 is shown having a top rail or bar
12, a pair of legs 14 and 16 supporting the top bar 12 at each end
and interlocked therein at joints 18 and 20. The legs 14 and 16 are
reinforced by chain bars 22 and 24 respectively to form an
"A-frame" configuration. Suspended from the top bar 12 are a
plurality of play supports 26, which plays may be of the type that
are supported by chains 28 such as swing seats or by uprights 30,
which support plays such as lawn swings. The ends of the top bar 12
are covered by plastic tips 31 and 32 to prevent water from being
accumulated within the top bar.
Although the instant invention is basically directed to providing a
boltless frame structure, the present frame construction is
particularly useful in the plays that are connected to the top bar
of the frame structure. At least, the broad concepts of this
invention are equally applicable for use with all plays connected
to the top bar. As shown in FIG. 20 and FIG. 21, the plays are
connected at uppermost points 34 of the top bar 12 by means of
hooks 36 inserted within washers 38 and single holes 40 of the top
bar 12. Therefore by this method, in using a single hole for
attaching the play support, the present invention is provided with
a frame structure that can be produced with lighter gauge tubing,
yet remains stronger because the holes 40 are not punched or
drilled through the tubing, but are drilled only at the upper
portion of the tubing.
It may be noted in FIG. 21 that for safety reasons hooks 36 are so
designed as to limit its rotating motion and thereby limits the
height the play can be propelled.
Referring further to FIGS. 2 to 6, the drawing shows the method the
end portions of legs 14 and 16 are constructed to produce a
reinforced taper for insertion within a complementary opening in
the top bar 12 as shown in FIGS. 13 and 14 to provide, through
gravity friction, tightening at the interlocked joints 18 and 20 of
the legs 14 and 16 within the top bar 12 while the gym set is in
use. That is, as hereinafter more fully described, the boltless gym
structure becomes tighter in use since the weight of the plays
directing a force downwardly will cause the legs 14 and 16 at
joints 18 and 20 to be inserted further within the top bar 12.
Therefore, in this manner, the boltless structure becomes tighter
while in use since the weight of the users causes the joints 18 and
20 to be more firmly connected.
In detail, each leg 41, 42 and 43 and 44 of the pair of legs 14 and
16 respectively comprises a tube 46 and a heavier gauge sleeve 48.
Each tube 46 has a slot 50 for insertion of the chin bars 22 or 24
by means shown in FIGS. 15 and 16 and hereinafter more fully
described.
A reinforced end is produced for each leg by inserting the sleeve
48 within an end 52 of the tube 46 of each leg. The end 52 is then
flattened and tapered as best shown in FIGS. 5 and 6. FIG. 5 shows
the sleeve 48 inserted within the end 52 of the tube 46, and FIG. 6
shows the end 52 with the sleeve 48 flattened and squeezed into a
taper 54.
One leg of each pair of legs 14 and 16, such as leg 41 or 43
remains as shown in FIG. 3, with a slot 56 formed therein and the
opposite leg of each pair of legs 14 and 16, such as leg 42 or 44
is cut, as shown in FIG. 4, having a smaller sized end 58 with a
taper 60 for insertion within the slot 56 of the legs 41 and
43.
Therefore, the initial taper of each leg 41, 42, 43 and 44 provides
for the interlocked joint and, further, securing of these legs
within the top bar 12 as the gym set is used and the taper 60
formed in legs 42 and 44 further secure these legs in legs 41 and
43 respectively as the gym is used and as best shown in FIG.
13.
FIGS. 7 to 12 show the manner in which the end portions of the top
bar 12 are fabricated. The top bar 12 comprises a bar or tube 62
having sleeves 64 and 66 of an outside diameter slightly smaller
than the inside diameter of two ends 68 and 70 of the tube 62. As
shown in FIG. 10, the sleeves 64 and 66 are fabricated of a flat
piece 72 with slots 74, 76, 78, and 80 cut through the plate. The
plate is then rolled into a sleeve, as best shown in FIG. 8 for
insertion within end 68 or 70 of the tube 62, as shown in FIG.
11.
The tube 62 is fabricated with slots 81 and 82 cut therethrough and
indentations 83 and 84 formed substantially diagonally opposite the
slots 81 and 82 respectively.
Referring specifically to FIGS. 11 and 12, one end 68 is shown. It
should be noted that the same arrangement holds true for the other
end 70 of the top bar 12. In FIG. 12, sleeve 64 is shown inserted
within end 68 of the top bar 12 with slots 74 and 76 of the sleeve
64 in line with slots 81 and 82 of the end 68 respectively. The
sleeve 64 and the end 68 are indented at 86 and 88, as best shown
in FIG. 12 to permit easy assembly of the tapered ends of legs 41
and 43 within the end 68 of the top bar 12.
As shown in FIGS. 13 and 14, the interlocked joint 18 which is the
time as the assembly of joint 20, the tapered end of leg 41 is
guided by indentation 86 through slot 82 of end 68 of the top bar
12 to reach the indentation 84 diagonally opposite the slot 82. The
slope of the taper at the end of the leg and the size of the slot
82 determining the depth the end of the leg is inserted within the
end 68 of the top bar 12. The tapered end of leg 42 is then guided
by indentation 88 through slot 81 of the tube 62 and through slot
74 of the sleeve 64 through slot 56 of leg 41 to the indentation 83
of the tube 62.
Here again the slope of the tapers and the size of the slots
determine the depth the leg is inserted within the end 68 of the
top bar 12 and the depth one leg is inserted within the other.
When the interlocked joint 18 is assembled as hereinbefore
described, it is held in place by the tapered end and the slots,
but it should be noted that before the application of weight to
cause gravity friction connection between the legs 41 and 42, a
spring latch 90 is needed to hold the first joint 18 together until
joint 20 is assembled in the same manner as described for joint 18.
Once the joint 20 is connected and the chin bars 22 and 24 are
inserted, as hereinafter more fully described, the spring latch 90
can be removed for insertion of the plastic ends 31 and 32.
FIGS. 15 to 17 show three means of interlocking the chin bars 23
and 24 within the legs 14 and 16 to form the A-frame configuration.
FIGS. 15 and 17 show end 92 of the chin bars 22 and 24 flattened
and bent so as to be interlocked into slot 50 of the legs. The end
92 is bent at a slight angle downwardly so as to lock in place as
the legs are caused to move opposite to each other as the gym set
is loaded. The further the legs are moved outwardly the more
clamping is caused by this downward angular configuration of the
ends 92 of the chin bars 22 and 24.
FIG. 16 shows two other methods of installation of the chin bars 22
and 24 on to the legs 14 and 16. The first method of installation
shows an end 96 bent at a 90.degree. angle to the body of a chin
bar and inserted within indentation 98 of the leg. Another method
of installation is the use of a sharp angular configuration 100 at
the very tip of end 102 of the chin bars with the end 102 wrapped
around the leg to produce a wrapping effect while at the same time
as the legs are moved outwardly due to loading of the gym set, the
increase of distance between the legs will cause tip 104 of the
angular configuration 100 to be further directed inwardly, as shown
by arrow 106, within slot 108 of the legs to more firmly hold the
chin bar within the leg.
Referring specifically to FIGS. 18 to 21, the means of attaching
the play supports on to the top bar is shown. FIG. 18 shows the
attachment of the chain support 26 wherein a rod 110 is bent in a
circle having an inside diameter slightly larger than the outside
diameter of the top bar 12 and hooked to form ends 112 for
insertion within a washer 144 for further insertion within holes 40
of the top bar 12, as hereinbefore described.
Another method of attachment of a play such as a lawn swing is by
having a lawn swing upright 116 wrapped around hooks 36 as
hereinbefore described, which in turn are connected within the
washers 38 and within holes 40 of the top bar 12.
FIGS. 22 to 25 show another embodiment of the invention. In a
conventional gym set with six or more plays it was previously
necessary to use a central top bar support. That is, the use of an
extra A-frame support in the center of the bar. This extra A-frame,
while acting as a support, was also an obstruction in the use of
the gym set. In addition, the length of the top bar was limited
since it was difficult to transport a top bar longer than a
prescribed length. In the present embodiment a top bar 120 of
substantially twice the length of a conventional top bar is used by
separating the top bar at the center into two pieces 121 and 122
connected and supported by an overhead support 124. In addition,
support 124 is used instead of the conventional central A-frame
support. The overhead support 124 is shown having a vertical bar
126 extended upward from the center of the top bar 120. From the
top of this vertical bar 126 extend two bars 128 and 130 which lead
from the top of the vertical bar to the ends of the top bar 120 and
enter into the top bar 120 at slots 132. The vertical bar 126 is
held in position by cotter pin 134. As shown in FIG. 23, the bars
128 and 130 interlock in the top of vertical bar 126. This assembly
acts as an overhanging trestle support, thus eliminating the need
for the extra central A-frame support.
In addition, this embodiment includes a supporting bar 136 which
can extend from either end of the top bar 120 and used to hang an
extra play.
As shown in FIG. 25, supporting bar 136 is held firmly between
A-frame legs 140 and 142 which have tapered ends such as the legs
41, 42, 43 and 44 of the first embodiment.
The shape of the end of bar 136 which fits into the end of the top
bar 120 is triangular as shown in FIG. 24 for firmly wedging
between the crossing of the legs, as best shown in FIG. 25. This is
also the shape of the ends of the bars 128 and 130 which fit into
slots 128 of the top bar 120.
FIG. 25 shows the same gravity friction interconnection between the
top bar 120 and legs 141, 142 as that described in the first
embodiment and best shown in FIG. 13.
FIG. 26 shows that the interlocking joint 18 of FIG. 1, better
shown in FIGS. 13 and 14, can be utilized in a conventional central
A-frame support. An overhead bar 150 is shown having three A-frame
supports 151, 152 and 153 connected by interlocking joints 154, 155
and 156 respectively. Here again, a single hole 158 is used for
attaching a play support as hereinbefore described. In this
respect, the present invention is provided with A-frame structure
having a lighter gauge overhead support yet remaining stronger
since the holes supporting the play support are drilled only at the
upper portion of the tubing.
FIG. 27 shows how a single overhead bar 160 can be reinforced by an
overhead support 164. Support 164 is used in place of the A-frame
support 152 of FIG. 26. The support 164 includes a vertical bar 166
which extends upward from the center of the bar 160. From the top
of the vertical bar 166 extends bar 168 which leads from the top of
the vertical bar 166 to the ends of the overhead bar 160. The
vertical bar 166 is held in position between the bar 168 and
overhead bar 160 by cotter pins 171 and 172 shown in FIG. 29 in
disassembled position. The structure 164 acts as an overhead
trestle support thus eliminating the need for the extra central
A-frame 152 of FIG. 26.
FIGS. 28 and 30 show another method of interlocking the two-piece
top bar 120. The two pieces 121 and 122 are connected and supported
by an overhead support 174. Support 174 is used instead of the
central A-frame 152 of FIG. 26. The support 174 is shown having a
vertical bar 176 extending upward from the center of the top bar
120. On either side of the vertical bar 176 extends a bar 178 which
in turn is hooked at its ends 181 and 182 to the top end portions
of the pieces 121 and 122 of the overhead bar 120. The support 174
acts as a trestle to support the overhead bar 120 without the need
for an extra central A-from 152 of the embodiment shown in FIG.
26.
The invention described may therefore be varied in construction
within the scope of the claims, for the particular devices selected
to illustrate the invention are but two of many possible
embodiments of the same. The invention therefore is not to be
restricted to the precise details of the structure shown and
described.
* * * * *