U.S. patent number 3,744,500 [Application Number 05/209,703] was granted by the patent office on 1973-07-10 for screen enclosure for picnic tables.
Invention is credited to Robert S. Briggs.
United States Patent |
3,744,500 |
Briggs |
July 10, 1973 |
SCREEN ENCLOSURE FOR PICNIC TABLES
Abstract
A foldable, portable, light-weight, screen enclosure for picnic
tables adjustable to fit tables of various lengths and widths. The
enclosure framework has corner uprights with horizontally extending
arms at their lower ends slidably receivable in horizontal tubular
sockets in respective attachment members releasably clamped to the
table corners. Horizontal members interconnecting the upper ends of
the uprights are hinged at their respective ends and midpoints,
permitting the framework structure to fold into a compact bundle of
parallel frame elements.
Inventors: |
Briggs; Robert S. (Port Crane,
NY) |
Family
ID: |
22779908 |
Appl.
No.: |
05/209,703 |
Filed: |
December 20, 1971 |
Current U.S.
Class: |
135/140; 135/96;
135/912; 135/161; 135/913 |
Current CPC
Class: |
E04H
15/32 (20130101); A47C 29/006 (20130101); Y10S
135/913 (20130101); Y10S 135/912 (20130101) |
Current International
Class: |
E04H
15/32 (20060101); A45f 001/00 () |
Field of
Search: |
;135/1R,3R,5R,7.1 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Caun; Peter M.
Claims
What is claimed is:
1. A demountable and foldable enclosure comprising:
four attachment members, each consisting of a tubular portion and a
releasable clamp adapted to secure the attachment member to a
support with said tubular portion disposed substantially
horizontally, said attachment members, in normal use, being secured
to a support in pairs, with the tubular portions of the respective
members in substantially horizontal positions, the locus of the
attachment members in normal use being at the corners of a regular
plane quadrilateral;
a framework structure made up of eight elongate members
interconnected with hinged joints to define, when erected for
service, four corners and the planes of five contiguous faces of a
rectangular parallelepiped, the faces corresponding to the top and
four sides of the enclosure, four of said members which are in
mutual parallelism each carrying adjacent its end remote from said
corners, a perpendicularly projecting cantilever arm, each arm
being slidably receivable in the tubular portion of a respective
one of said attachment members; and
a fabric covering loosely attached to said framework structure,
said fabric being deployable in panels corresponding to and
substantially coextensive with the five contiguous faces of the
parallelepiped.
2. An enclosure according to claim 1 wherein each of the remaining
four elongate members, constituting edges of the parallelepiped in
one of said planes corresponding to the top of the enclosure, is
hinged at its ends to two of said parallel elongate members and at
its midpoint for pivotal movement about parallel axes in said one
plane, the pivotal axes of each of said remaining elongate members
being substantially aligned with the corresponding axes of the
elongate member parallel and opposite thereto, and orthogonal to
the axes of the elongate members adjacent and perpendicular
thereto.
3. An enclosure according to claim 2 wherein at least two parallel
and opposite ones of said remaining elongate members each includes
a telescoping slip joint permitting adjustment of the length of
said two members.
4. An enclosure according to claim 3 including a wheel mounted at
the end of two adjoining ones of said parallel elongate members for
rotation about co-linear axes.
5. An enclosure according to claim 4 wherein said elongate members
are fabricated of hollow stock of substantially square or
rectangular cross-section, said remaining four of said elongate
members contain longitudinal slots on their undersides, and said
enclosure includes a plurality of slide members with enlarged heads
slidably disposed in the slotted members, said slide members having
shank and hook portions extending through said slots and secured in
supporting relation to respective panels of said fabric.
6. An enclosure according to claim 5 wherein at least some of the
panels of said fabric are formed of an insect-proof mesh.
7. An enclosure according to claim 6 wherein each of the four
corners of the parallelepiped is formed of an end of one of said
parallel elongate members and the respective ends of two of said
remaining elongate members in mutually orthogonal relation
pivotally joined by a hinge joint assembly comprising:
means defining at said one end of each of said two remaining
elongate members a pair of spaced parallel gudgeons extending
laterally beyond the longitudinal edges of said members and
containing coaxially aligned bores;
means defining at said one end of the parallel elongate member, a
first gudgeon extending laterally beyond a longitudinal edge of
said member and in the plane of the face of the parallelepiped
defined by the vertical and one of said two remaining elongate
members;
means defining at said one end of the parallel elongate member, a
second gudgeon extending laterally beyond a longitudinal edge of
said parallel elongate member in the plane of the face of the
parallelepiped defined by said vertical member and the other of
said two remaining elongate members, said first and second gudgeons
containing respective bores perpendicular to the said planes
defined by the vertical member and the respective remaining
elongate members, the axes of said bores lying in another plane
perpendicular to the said planes, the bores in said one gudgeon and
second gudgeon being coaxially aligned respectively with the bores
in the parallel gudgeons on one and on the other of said two
remaining elongate members; and
a pintle member containing a right angle bend, said pintle member
being disposed in said other plane with the portion on one side of
the bend journaled in the bore of said one gudgeon and the bores of
the parallel gudgeons aligned therewith and with the portion of the
pintle member on the other side of the bend journaled in the bore
of the second gudgeon and the bores in the parallel gudgeons
aligned therewith.
8. An enclosure according to claim 7 including means defining a
third gudgeon on said parallel elongate member parallel to, and on
the opposite side of the member from, one of the other gudgeons
thereon and having a bore coaxially aligned with the bore of said
one other gudgeon and receive said pintle member.
9. An enclosure according to claim 8 wherein said parallel gudgeons
consist of flat plates secured to respective parallel faces of the
elongate members with respective end portions projecting beyond the
corresponding longitudinal edges of the members.
10. An enclosure according to claim 9 wherein at least some of the
flat plates are L-shaped and have one leg of the L parallel to and
in surface abutment with the elongate member and the other leg
constituting the projecting end portion of the plate.
11. An enclosure according to claim 9 wherein at least some of the
flat plates are of substantially rectilinear configuration and
extend at an acute angle to the longitudinal axes of the elongate
members.
Description
This invention relates to demountable and foldable enclosures and
more particularly to screen enclosures for picnic tables and the
like.
The unwelcome presence of insects at picnics has been endured for
generations and accepted as an unavoidable concomitant of outdoor
dining. While to the majority of picnickers flies and even stinging
insects are only a source of aggravation and unpleasantness, for
many who suffer allergic reactions, the sting of a bee or a wasp
can have serious, even fatal, consequences. Despite this
long-existing state of affairs, and the more or less obvious
solution of providing a screen enclosure for picnic use, nothing in
the way of a truly practical screen covering for picnic tables has
been proposed in the prior art.
Those that are known are either too cumbersome to be conveniently
carried to a picnic site and/or fail to provide for adjustment to
accommodate the variety of shapes and sizes of picnic tables
encountered.
The objects of the present invention are to provide a screen
enclosure for picnic tables which provides complete protection from
flying insects, is light in weight, is easily erected and adjusted
to various sizes of picnic tables, and folds into a compact bundle
for easy transport even over rough terrain and woodland paths.
To the accomplishment of the foregoing and other objects, the
invention contemplates an enclosure formed of four vertical and
four horizontal elongated members defining four corners and the top
and side faces or panels of the structure. The vertical members
have horizontally extending cantelever arms which are freely
slidably received in horizontal tubular portions of respective
support members secured to the four corners of a picnic table.
Sliding the arms into and out of the tubular support member
portions enables adjustment of one horizontal dimension. Two of the
horizontal members include telescoping joints to permit adjustment
of the enclosure in the other horizontal direction. All of the
horizontal members are hinged at their midpoints and ends to permit
the enclosure to be folded into a compact bundle which can easily
be carried by one person or rolled on two wheels in the manner of a
golf cart. A unique hinge joint assembly is provided at each of the
four corners of the enclosure which provides high rigidity in the
structure when erected. Fabric, at least selected areas of which is
insect screening, covers the top and four sides of the enclosure,
completely enveloping a picnic table and the seats as well.
In the drawings:
FIG. 1 is a perspective elevational view of an enclosure according
to the invention fully erected and installed on a picnic table;
FIG. 2 is a perspective elevational view of one of four identical
support members shown installed at the corners of the picnic table
in FIG. 1;
FIG. 3 is a fragmentary enlarged perspective view of one of the
corner joint assemblies appearing in FIG. 1;
FIG. 4 is a plan view of the joint assembly shown in FIG. 3;
FIG. 5 is a fragmentary elevation of a portion of the structure in
FIG. 1 on an enlarged scale;
FIG. 6 is a cross-sectional view taken on line 6--6 of FIG. 5;
and
FIG. 7 is a perspective elevation of the enclosure of FIG. 1
demounted and folded for transport.
Referring to FIG. 1, the enclosure, designated in its entirety by
reference numeral 10, comprises a framework structure 12 and four
attachment members 14a, 14b, 14c and 14d secured in series to the
respective corners of a picnic table 16.
As best shown in FIG. 2, each attachment member 14 consists of a
clamp, such as C-clamp 18, and a tubular portion 20 so oriented
with respect to the clamp that it is disposed in a horizontal
position when the clamp is secured to the edge of table top 22.
In the illustrated form attachment members 14 are of fabricated
construction, the tubular portion 20 being a length of
square-section metal tubing having a longitudinal flange 20a by
means of which it is secured to clamp 18 by metal straps 22, 24. Of
course, other forms of construction are possible.
Reverting to FIG. 1, framework structure 12 is made up of eight
elongate members defining four corners and five contiguous faces of
a rectangular parallelepiped, which faces constitute the top and
side panels of the enclosure. Four of the elongate members, 26a,
26b, 26c, 26d, are disposed in mutual parallelism when the
structure is erected and form the corner uprights of the
framework.
The upper ends of members 26a-d are hingedly connected to the
remaining elongate members, 28a, 28b, 30a and 30b to form corner
joint assemblies 32a, 32b, 32c, 32d in a manner to be described
presently. Adjacent their respective ends remote from corner joints
32 each of the vertical members 26 carries a cantelever support arm
34a, 34b, 34c, 34d pivotally secured at one end to the associated
vertical member 26a - 26d, preferably by means of a nut and bolt
assembly so that the resistance of the arm to pivotal movement can
be adjusted; this adjustment is such as to maintain the arm against
spontaneous pivotal movement while permitting it to be moved
manually with relative ease.
When the framework is erect, arms 34a - 34d are positioned to
project perpendicularly to the respective longitudinal axes of the
vertical members with the arms 34a and 34d on one pair of vertical
members 26a and 26d defining one side panel of the enclosure
extending coaxially toward each other in the plane of that panel.
Similarly the arms 34b and 34c on the remaining pair of vertical
members 26b and 26c extend coaxially toward each in the plane of
the side panel defined by said members.
The cross-sectional size and configuration of arms 34 enables a
free-sliding fit into the tubular portions 20 of respective
attachment members 14a - 14d, when the framework is erected.
Consequently, the framework accommodates a wide range of table
widths, i.e., for narrow tables only a small fraction of the length
of arms 34 are received in tubular portions 20 and conversely for
wider tables.
While support arms 34a - 34d have been described as disposed in the
planes of parallel sides of the enclosure, it will be appreciated
that they can be disposed in diagonal planes, i.e., planes defined
by vertical members 26a and 26c and by 26b and 26d. In such an
event, attachment members 14a - 14d would be installed
correspondingly with the tubular portions on diagonal lines of the
table top. With such an arrangement, particularly adapted to square
top tables, sliding of arms 34a - 34d in and out of the tubular
sockets on the attachment members, would effect simultaneous
adjustment of both length and width dimensions of the structure as
will be more fully understood as this description proceeds. Of
course, the support arms 34 can also extend in planes intermediate
the side planes and diagonal planes, if desired, and the attachment
members 14 installed accordingly.
Each of the elongate members 28a, 28b, 30a, 30b is hinged at its
midpoint and at its ends is hinged to respective pairs of adjoining
vertical members 26a - 26d. The axes of the hinges in member 28a
are parallel to each other and coaxially aligned with corresponding
hinges in the opposite and parallel member 28b. In like manner, the
hinge axes of member 30a are parallel and coaxially aligned with
those of member 30b.
In order to provide maximum rigidity to the erected structure and
maintain the horizontal members 28a,b and 30a,b in position
foldable corner braces 31a to 31h, each of which preferably is a
standard hardware item popularly known as a lid support. Each
support extends diagonally across a respective corner angle and has
its ends pivotally fastened, as by rivits, to a vertical member 26
and an adjoined horizontal member. At its midpoint, each lid
support has a limited hinge joint 33 (shown in FIG. 3) which
permits folding in one direction and establishes a fully extended
position by means of a stop which prevents angular movement in the
other direction beyond the condition in which the segments form a
straight angle, i.e., 180.degree..
The details of a hinge joint typical of those at the midpoints of
members 28a,b and 30a,b are shown in FIG. 5 for member 28a. Thus
member 28a is divided into two abutting length segments along
parting line 36. L-shaped plates 38a, 38b and 40a, 40b are secured
in parallel pairs on opposite sides of the abutting segments of
member 28a with one leg of each L-shaped plate projecting laterally
beyond a longitudinal edge of member 28a to form parallel pairs of
gudgeons 42 and 44 containing coaxially aligned bores receiving a
gudgeon pin 46.
Each of the elongate members 28a and 28b includes a telescoping
slip joint 47 by which the length of the member may be adjusted to
accommodate tables of different lengths. A pin 48 on the inner
member of the slip joint 47 riding in a longitudinal slot 50 in the
outer member limits the extent of adjustment and prevents the
members from becoming disengaged.
While slip joints are shown and necessary only in members 28a,b of
the illustrated embodiment, it will be appreciated that they can be
provided in members 30a and 30b as well and this would be
particularly advantageous in a variant structure, discussed above,
where the mounting arms 34a - 34d are disposed on diagonals of the
structure.
Referring now to FIGS. 3 and 4, there is illustrated in detail the
corner joint assembly 32d typical of all four such assemblies of
the framework structure. With the framework erected, the respective
longitudinal axes of members 30a, 28b and 26d are in mutually
orthagonal relation. At the end of member 28b, an L-shaped plate 51
is secured as nut and bolt assemblies 53, or by rivits, welding or
other suitable means to one side face of the member with one leg
parallel to the member's long axis and the other leg 51a extending
laterally beyond the longitudinal edge of the member to form one of
a pair of parallel gudgeons, the other being formed by a similar
plate not visible in FIG. 3 but secured to the opposite face of
member 28b and visible in FIG. 4 where it is designated as 54.
Spacing washers 55 are placed between plate 54 and member 28b and
at other locations in the joint assembly for reasons which will be
self-evident from the ensuing description. Gudgeons 51a and 54a
contain coaxially aligned bores 51b and 54b.
Elongate member 30a is similarly equipped with plates 56, 58,
forming gudgeons 56a, 58a, containing coaxially aligned bores 56b,
58b.
While L-shaped plates have been described, other means may be used
to form gudgeons laterally off-set from the elongate members. Thus,
a single gudgeon 59a is provided on the upper end of vertical
member 26d by means of a rectilinear plate 59 fastened to the
member at an acute angle to its long axis. Another gudgeon 60a
containing a bore 60b is provided at the upper end of member 26d by
means of L-shaped plate 60 in the manner of members 28b and 30a. At
least one additional gudgeon 61a is provided on member 26d,
parallel to gudgeon 60a by means of plate 61 having a bore 61b
coaxial with 60b.
Members 28b, 30a and 26d are pivotally connected by means of a
single gudgeon pin or pintle 62 containing a right angle bend. The
end of the pintle on one side of the bend is journaled in the bores
of gudgeons 60a, 51a, 61a and 54a and the other end in the bores of
gudgeons 59a, 56a, 58a. In this manner members 28b, 30a and 26d can
be folded relative to one another from the orthogonally related
position shown in FIG. 3 to one in which the long axes of the three
members is parallel. The corner joint assembly just described
permits this movement while imparting to the corner joints great
rigidity and resistance to twisting, not possible with conventional
hinges of known design or practical construction.
At the lower ends of each of two of the vertical members, 26c and
26d in the illustrated embodiment, small, preferably rubber-tired
ground-engaging wheels 64,66 are rotatably mounted to facilitate
transport of the enclosure when folded as will be seen
presently.
As shown in FIG. 1, the framework structure 12 is covered with
fabric forming panels corresponding to the top and four sides of
the enclosure 10. The fabric may consist entirely of a non-metallic
(e.g., Fiberglas) insect screen or the top and one or two sides may
be a closely woven material or solid plastic sheet to provide
shade. The fabric is loosely attached to the horizontal members 28,
30 in any suitable manner. In the illustrated embodiment members
28, 30 contain longitudinal slots in their undersides as
exemplified by slot 68 in the typical cross-section shown in FIG.
6. A plurality of slide members 70 such as that shown in FIG. 6
have enlarged head portions 70a slidably disposed with a respective
horizontal members, a shank portion 70b extended through slot 68
and a hook portion engaging a loop 72 on the enclosure fabric. The
fabric panels are split as at 74, 76 on opposite sides to
facilitate entry into and egress from the enclosure. Small weights
78 are fastened at regular intervals along the bottom edge of the
fabric covering to prevent lifting and blowing in the wind.
Prior to demounting the enclosure, the fabric covering is folded
around or reefed about the horizontal members. The framework
structure is then collapsed by loosening and removing attachment
members 14a -d from the table and slipping them off the support
arms 34a -d; these arms are then folded up alongside the respective
vertical members 26a-d. By "breaking" corner braces 31a-6, the
horizontal members 28a,b and 30a,b can then be folded at their
midpoints while moving the vertical members toward the central
vertical axis of the enclosure so that all frame members assume
parallel contiguous positions to form a compact bundle as shown in
FIG. 7. A strap or other cincture device 80 binds the upper part of
the bundle together and pivotal latch bars 82 of known design
perform a similar function at the lower part. In FIG. 7 it will be
apparent that the two vertical members 26a and b not carrying
wheels 64,66 are longer than 26c and d by an amount approximately
equal to the radius of the wheels to form a stand for the bundle,
making it self-supporting and stable in an upright position. A
handle 84 fastened to the bundle by strap 80 or in any other
suitable way provides a convenient handle-hold for supporting the
upper end of the bundle and pushing it when tilted back on wheels
64,66.
The demounting and folding procedure just described is reversed to
erect the enclosure.
* * * * *