Solar cooker

This disclosure is directed to a portable, knock down, solar cooker having a box-shaped supporting body to which an expandible parabolic reflector and associated solar oven can be readily assembled and disassembled without the use of any hand tools, and in the disassembled position the component parts can be readily stowed within the box shaped supporting body. The solar cooker also includes a foldable parabolic reflector associated with a solar oven which has a circumscribing shield to define a confined air space about the solar oven in the erected position to enhance the efficiency thereof.

PRIOR ART 
Heretofore, numerous efforts have been made to develop a practical and 
workable solar cooker. In view of the present day energy crisis, the 
desire for a simple, portable, and efficient solar cooker is ever 
increasing. The following noted U.S. Patents are exemplary of the known 
efforts made by others to attain a practical and workable solar cooker; 
viz. U.S. Pat Nos. 2,859,745; 2,945,417; 2,994,318; 2,998,002; 3,053,248; 
2,326,227; 3,391,688; 3,896,786; 3,938,497; 3,990,914; 4,023,555; 
4,083,357; and 4,130,106. 
OBJECTS 
An object of this invention is to provide an improved portable, readily 
knock down, solar cooker which can be readily assembled and disassembled 
without the use of any hand tools. 
Another object is to provide a solar cooker having a construction whereby 
the respective component parts can be readily stored within the support 
body of the solar cooker when in the knock down position. 
Another object is to provide a portable knock down, solar cooker having an 
improved parabolic reflector and associated oven construction for 
obtaining maximum utilization of the sun's available energy. 
Another object resides in the provision of a portable solar oven or cooker 
which is relatively simple in construction; can be readily fabricated; and 
which is positive in operation. 
BRIEF SUMMARY OF THE INVENTION 
The foregoing objects and other features and advantages are attained by a 
solar cooker which includes a box shaped support to which the component 
parts such as the parabolic reflector and associated oven are attached in 
the erected position, and in which the component parts are stored in the 
disassembled or knock down position. The component parts comprise a pair 
of arms for detachably supporting therebetween a foldable parabolic 
reflector. Each of the respective arms include a pair of complementary arm 
segments which have overlying complementary end portions which are 
particularly constructed with inturned tabs having aligned openings which 
are adapted to extend into the box shaped body and which arms are rigidly 
held in assembled position by the insertion through the aligned openings a 
stanchion. The oven of the cooker is supported between the upper ends of 
opposed stanchions in predetermined spaced relationship to the parabolic 
reflector extended between the opposed arms fixed to the body by the 
stanchions. The oven construction comprises a tubular member in which the 
comestibles to be cooked is placed. Spaced about the tubular oven member 
is a transparent shield to define a confined space about the tubular oven. 
Connected to one of the stanchions are a pair of leg members which are 
pivoted to adjust the inclination of the solar cooker relative to the sun. 
FEATURES 
A feature of this invention resides in the provision of a solar cooker 
having a minimum of component parts which are relatively simple in 
construction and which can be readily assembled to define a sturdy and 
readily portable cooker which can be easily and quickly assembled and 
disassembled. 
Another feature resides in the provision of a pair of extensible arms which 
are detachably connected to the body portion of the solar cooker for 
supporting therebetween a foldable parabolic reflector which is provided 
with a curvilinear surface and which is disposed relative to the 
associated oven so that sun's rays striking the reflector are directed and 
focused toward the central axis of the oven for maximum efficiency. 
Another feature of this invention resides in the provision in which each of 
the extensible arms are constructed as two complementary arm segments 
which have overlying complementary end portions that are detachably 
secured to the body of the cooker by the stanchions. 
Another feature resides in the provision in which the optimum relationship 
between the reflector and the oven is maintained relatively fixed and 
assured in each assembly operation.

DETAIL DESCRIPTION 
Referring to the drawings, there is illustrated a solar cooker 20 which 
embodies the present invention. The illustrated solar cooker 20 is a 
portable type which can be readily assembled from its stowed position 
wherein all of the component parts are stored in the box shaped housing 21 
as seen in FIG. 10, to its operative assembled form as best seen in FIG. 
1. 
The solar cooker 20 comprises its box shaped body portion 21 which is 
defined by a body portion 22 formed as a rectangular box having opposed 
side walls 22A and 22B; interconnected end walls 22C and 22D, and a bottom 
wall 22E. A hinged cover 23 is connected to the box body 22. The 
arrangement is such that the box shaped housing 21 described functions as 
a support for maintaining the components of the solar cooker in the 
assembled position, as will be hereinafter described, and as a storage box 
for the components in the knock down position. 
Essentially, the solar cooker 20 comprises the box shaped housing 21, a 
foldable solar reflector 24, the collector or solar oven or cooking 
recepticle 25, and a pair of opposed stanchions 26 and 27 which function 
to maintain the component parts in the assembled position and to fixedly 
locate the oven or recepticle 25 at the focal center of the reflected sun 
rays. 
Referring to FIGS. 1 and 2, the reflector means 24 comprises a pair of 
opposed support arms 29--29, which are secured to the respective ends 22C 
and 22D of the box shaped housing 21 as will be hereinafter described, and 
a foldable reflector 30 supported therebetween. Each of the opposed arms 
29; 29 as best seen in FIGS. 1, 4, and 5 comprise a pair of complementary 
arm segments 29A and 29B which are somwhat similar in construction but 
opposite in hand. Each arm segment 29A and 29B has a side portion 31 
having an upper edge 31' having a curvilinear contour to which a "C" 
shaped track 32 is connected. The track 32 of the respective oppositely 
disposed arms 29 define a guideway for receiving the edge portion of a 
flexible reflector 30. As best seen in FIG. 1, the reflector 30 comprises 
two half sections 30A and 30B which are slid into the opposed 
complementary tracks 32. 
Referring to FIGS. 5 and 6 each complementary arm segments 29A, 29B is 
provided at its inner end portion with upper and lower inturned tabs. For 
example, arm segments 29A at its inner end is provided with spaced 
inturned tabs 34 and 35. The inner end portion of complementary arm 
segments 29B is provided with upper and lower inturned tabs 34A and 35A. 
The respective tabs 34, 35, and 34A, 35A are each provided with respective 
openings 34', 35' and 34A', 35A'; which in the assembled position are 
disposed in alignment as seen in FIGS. 5 and 6. If desired, arm 29B may be 
provided with an offset as seen at 36' in FIGS. 2 and 5 so that the inner 
end of arm 29 may overlap the inner portion of arm 29B. For reasons which 
will be hereinafter apparent, the holes 34', 35' and 34A' and 35A' are 
sized to conform to the shape of the respective stanchions 26 and 27. 
As best seen in FIG. 10, the side portions 22C and 22D of the box body 21 
are each provided with a T shaped type slot 36, 37 adjacent to the top and 
bottom thereof respectively. 
The respective stanchions 26 and 27 are each formed of a suitable flat bar 
or stock, each of which is provided with an opening 26A and 27A adjacent 
to the upper end thereof. The lower end of stanchion 26 is laterally bent 
as indicated at 26B. The lower end of stanchion 27 has connected thereto a 
pair of adjustable leg extensions 37 and 38. The respective leg extensions 
are adjustably connected to the stanchion 27 by a fastener or bolt 39. It 
will be understood that the leg extensions are adjustably connected to 
stanchion 27 and can be adjustably secured in any adjusted position by 
tightening of the fastener 39; which comprises a bolt and a wing nut. The 
arrangement is such that one end of the cooker 20 can be raised or lowered 
accordingly by adjusting the angle or spread of the respective leg 
extensions as noted in FIG. 1. Thus, the angle of the cooker 20 in its set 
up position can be varied in accordance to the angle of the sun rays. 
The collector or oven portion 25 comprises a tubular body 25A which is 
closed at each end by end walls 25B and 25C, one or both of which is 
rendered readily detachable connected to the tubular body 25A; so as to 
provide access to the tubular body. If desired, suitable seals may be 
provided about the end walls 25B and 25C to provide a fluid tight closure 
with body 25. In the illustrated embodiment, the end walls 25B and 25C are 
provided with an extending boss or pin 40 which is adapted to be received 
in the opening 26A and 27A of the corresponding stanchion 26 and 27. It 
will be understood that the outer surface of the tubular body 25A may be 
painted or colored black for maximum absorption of the sun's rays. 
Supported between the end walls 25B and 25C and in spaced relationship to 
the body 25A is a transparent shield 41. The shield 41 functions to define 
and maintain a closed space about the oven or collector body 25A to 
confine the absorbed heat within said space, and which shield also 
functions to prohibit the winds or air current from circulating directly 
about the collector body 25A, which if permitted would greatly reduce the 
overall efficiency of the solar oven or collector body 25A. 
The curvature of the solar reflector 30 is defined by the curvilinear 
tracks 32 so that sun rays reflecting therefrom are focused or 
concentrated on the solar collector or tubular body 25A. The solar 
reflector 30 is generally parabolic in shape and has a curvature 
constructed so that the angle of incidence of the sun rays striking the 
surface of the reflector equals the angle of deflection so that virtually 
all of the sun's rays are concentrated on the collector or oven 25. 
The comestible or liquid desired to be heated is placed in the tubular 
collector or oven 25. As shown in FIG. 7, solid foods such as meats 42 can 
be cooked on a skewer 43. The skewer 43 is constructed with a cross-head 
or end portion 43A which is sized to frictionally engage the internal 
surface of the collector or oven 25, and is thus rendered self-supporting 
within the oven. 
Referring to FIG. 8, the reflector sections 30A and 30B are made foldable 
by adhesively securing sections 30C of the reflectors to a readily 
foldable or flexible backing material 44. With the construction described, 
the reflector sections 30A and 30B can be readily folded in the manner of 
an accordian fold so that in the knock down position the reflector 30 as 
well as the other described components can be readily stowed within the 
box shaped body 21. 
To assemble the solar cooker 20, the respective arm segments 29A and 29B 
are disposed so that the inner end portions are disposed in overlapping 
position so that the holes 34' and 35' are disposed in alignment with 
holes 34A' and 35B.' With the respective arm sections so disposed, the 
center tab portions are inserted into the aligned T shaped slots 36 and 37 
of the box body 21. With the arm segments positioned so that tabs and 
their respective openings projecting into the box body 21, a stanchion 
member e.g. 26 is inserted from beneath the box body 21 so as to pass up 
through the aligned openings 37, 35', 35A', 34A,' 34' and 36. The 
stanchion is extended through said aligned openings until it is limited by 
the bent lower end 26B against the bottom 22E of the body. 
The other pair of arm segments are assembled and secured to the other side 
of the box body by stanchion 27. With the respective stanchions 26 and 27 
so placed, the respective arm segments 29A and 29B as rigidly secured to 
the opposed sides of the body without the need of any extraneous tools or 
fastening means. 
The collector or oven can then be detachably connected between the upper 
ends of the respective stanchions 26 and 27 by inserting the pins 40 on 
the end portions 25B and 25C into the corresponding holes 26A and 27A in 
the ends of stanchions. 
The reflector sections 30A and 30B are assembled by sliding the opposed 
edges thereof through the guideway defined by the opposed track portions 
32 of the respective arm segments. 
To tilt the assembled cooker 20 as may be desired to due to the position of 
the sun, the respective leg extensions connected to stanchion 27 may be 
spread apart or brought closer together as may be required so as to 
position the reflector to capture and reflect the maximum amount of the 
sun's rays. 
From the construction described, it will be noted that the relative 
position of the collector or oven 25 is maintained in a fixed relationship 
to the reflector in the assembled position. 
To disassemble, the steps are reversed and the cooker can be readily 
disassembled and assembled in a matter of seconds without the aid of any 
extraneous tools or parts. Also the component parts including the 
reflector and collector or oven can be readily stowed within the box 
shaped body thereby assuring that none of the component parts become lost 
or misplaced as is frequently the case with readily knock down type of 
devices. 
While the foregoing invention has been described with respect to a 
particular embodiment thereof, it will be appreciated and understood that 
variations and modifications may be made without departing from the spirit 
or scope of the invention.