U.S. patent number 3,811,682 [Application Number 05/258,504] was granted by the patent office on 1974-05-21 for folding puzzle.
This patent grant is currently assigned to Berkeley Applied Research Corporation. Invention is credited to Robert E. Neale, Paul C. Wilhelmsen, David R. Winterhalter.
United States Patent |
3,811,682 |
Neale , et al. |
May 21, 1974 |
FOLDING PUZZLE
Abstract
An interlocking folding puzzle is formed from an elongated
rectangular web having a plurality of triangular stiffening panels
arranged thereon in spaced apart sets of four to form four
repeating spaced apart edge aligned squares. Each of the squares is
folded along one of its diagonals and the ends of the web are
connected together such that each square forms one quarter of a
composite interfolded square. Those portions of the web between the
stiffening panels constitute hinges which enable the stiffening
panels to assume various relationships relative to each other. The
web is formed of polyethylene, polypropylene or polyvinylchloride
to provide long life, non-memory hinges.
Inventors: |
Neale; Robert E. (New York,
NY), Wilhelmsen; Paul C. (Alamo, CA), Winterhalter; David
R. (Berkeley, CA) |
Assignee: |
Berkeley Applied Research
Corporation (Alamo, CA)
|
Family
ID: |
22980836 |
Appl.
No.: |
05/258,504 |
Filed: |
June 1, 1972 |
Current U.S.
Class: |
273/155;
273/DIG.5; 446/109; 273/DIG.4; 273/DIG.12; 446/488 |
Current CPC
Class: |
A63F
9/088 (20130101); Y10S 273/05 (20130101); Y10S
273/12 (20130101); Y10S 273/04 (20130101) |
Current International
Class: |
A63F
9/06 (20060101); A63F 9/08 (20060101); A63f
009/08 () |
Field of
Search: |
;273/155 ;46/1L,157 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
Edmund Catalog 711, Issued September, 1970, page 32 relied on .
Mathematical Models by Cundy & Rollett, 2nd Edition reprinted
1962, University Press, Great Britain, page 205 relied on.
|
Primary Examiner: Oechsle; Anton O.
Attorney, Agent or Firm: Philips, Moore, Weissenberger
Lempio & Strabala
Claims
1. An interlocking folding puzzle comprising:
an elongated rectangular flexible elastomer web having opposite
ends; and
a plurality of triangular stiffening panels disposed on the surface
of said web and fixedly attached thereto, said panels arranged in
spaced apart relationship in sets of four to form four repeating
spaced apart edge aligned squares, each of said squares being
foldable along either diagonal wherein portions of said plastic web
between said panels and said squares form non-memory hinges, said
squares each being folded along one diagonal into a planar lapping
relationship to form one quarter of a composite square, the ends of
the thus interfolded web being connected together to form an
endless loop, each of said quarter squares including two of said
triangular stiffening panels whereby the relative arrangement of
said panels can be interchanged through folding permutations of
said endless loop along said non-memory hinges without distorting
said stiffening
2. The puzzle defined in claim 1 wherein the elastomer is a plastic
selected from the group consisting of polyethylene, polypropylene
and
3. The puzzle defined in claim 1 wherein the stiffening panels are
formed
4. The puzzle defined in claim 1 wherein said stiffening panels
have at least two different indicia thereon distinguishing some of
said panels from other of said panels.
Description
BACKGROUND OF THE INVENTION
Numerous paper puzzles made by folding paper have intrigued persons
of all ages for years, and in particular, professionals in the
scientific fields, such as mathematics. Mathematical problems or
games, such as the number of different ways to fold a rectangular
map which is creased lengthwise and widthwise to form a matrix of
identical rectangles, is an example of a problem which can be
attacked by folding a piece of paper. Since the actual physical
permutation of folding operations experienced with paper puzzles or
models are fascinating of themselves, especially when combined with
a search for a solution to an underlying problem, these puzzles are
both entertaining and educational. Further, these operations can be
repeated by others for both purposes. Indeed some of the paper
puzzles themselves are unique in their arrangement and structure,
apart from any underlying theory, being a puzzle in a more general
sense, as contrasted to a tool or physical model. For example, see
"Folding Money" Volume II edited by Randlett (Magic Inc. 1968)
demonstrating some of the latter situations. More generally paper
folding is also an Oriental art known as origami, having many
advocates, demonstrating the interest in this area.
Because these paper puzzles involve a series of paper panels hinged
together, with a fold line, their service life is limited. Also the
folding may produce a "memory" in the puzzle making its solution
too simple for a subsequent user. Further, the mechanical strength
of such hinges may be inadequate for a puzzle designed for repeated
use. Special hinges used between the panels tend to be
prohibitively expensive and do not provide the necessary
flexibility often required.
Thus, it is an object to provide a plastic web and panel design for
such puzzles which are both durable and inexpensive, as well as a
unique puzzle having such a format.
SUMMARY OF THE INVENTION
A folding puzzle having excellent durability can be formed with an
elastomer mat or web having spaced thereon a plurality of
stiffening panels whereby the web will provide a hinging function
between the several panels, as the latter are articulated relative
to one another. The stiffening panels may have a variety of shapes,
but in a preferred embodiment they are triangular, with sets of
four such panels assembled in closely spaced relationship on the
web to approximate a square, with four such squares arranged in an
edgewise linear sequence on the rectangular web. With designs added
to half of each such assembled "sets," such as coloration, the web
may be folded in a lapping relationship, forming a larger
interlocked square by joining the opposite ends of the rectangular
web of the linear sequence of smaller squares. If the designs on
the panels are properly arranged, the final interlocked square can
be manipulated to obtain a mixed design on opposite sides of the
interlocked square or a uniform design on both sides.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood by referring to the
drawings wherein:
FIG. 1 illustrates a plan of the puzzle format employing a
rectangular elastomer web or sheet with a plurality of spaced-apart
stiffening panels disposed on the surface thereof;
FIG. 2 is a perspective of one end of the puzzle format showing the
relationship of the web and the individual panels;
FIGS. 3, 4, 5 and 6 are successive plan views of the puzzle format,
with FIG. 3 illustrating the first folding operation, FIG. 4
illustrating the second folding operation, FIG. 5 showing the third
folding operation and FIG. 6 illustrating the final folding
operation to form the larger interlocked square; and
FIG. 7 illustrates the completed puzzle in plan showing the panels
in an alternate configuration, with the colored panels all arranged
to be viewed from one side of the puzzle as opposed to the mixed
configuration shown in FIG. 6.
DESCRIPTION OF AN EMBODIMENT
Referring to FIG. 1, the puzzle format 10 is illustrated in an
unfolded condition and by considering FIGS. 1 and 2, it can be seen
the puzzle format employs an elastomer mat or web 11 with a
plurality of panels disposed thereon in a spaced-apart
relationship, the pattern having a repeating sequence. The web is
rectangular in shape and can be selected from various elastomers,
such as polyethylene, polypropylene or polyvinylchloride.
Polypropylene is somewhat preferred because of its superior flexing
characteristics in hinging applications. Also, these materials, in
the thin webs employed, (3 to 10 mil), are translucent or clear
which will allow the coloration (designs) in some of the panels to
be seen from both sides of the web. For example, this is
illustrated in FIG. 4, wherein the bottom surface 12 of the web is
shown along with the top surface 13 of the web in the same figure
as a result of a fold, and the coloration of all the colored panels
is seen, even though some are viewed from the bottom side of the
web.
More particularly, the panels 14 and 15, disposed on the top
surface 13 of the mat or web 11, are identical except for
coloration. Obviously designs may be employed on the surfaces of
these panels in place of the coloration, which has been indicated
by shading. The panels themselves are triangular, actually
isosceles right triangles, and forming stiffening members on the
web, thereby allowing the web portions between the stiffening
members (panels) to function as hinges. The panels are preferably
formed integrally with the web, but may be welded thereto
ultrasonically or with solvents, when separately formed. Also, the
panels may be actually disposed in the web, when integrally formed
therewith, so a raised portion thereof occurs on both the top and
bottom surfaces of the web, as opposed to being primarily
associated with one surface, as shown in drawings herein.
Panels 14 and 15 are associated with the web or mat 11 in a pattern
which includes "sets" of four panels slightly spaced-apart to form
squares, as shown in FIG. 2, and four of these "sets" are arranged
in a linear sequence, as can best be seen in FIG. 1. In this
figure, it can also be seen that tabs A and B are employed at the
opposite ends of the rectangular mat or web which tabs have a width
equal to the space between the "set" and individual panels referred
to above. Ultimately the tabs will be fused together to join these
ends in the puzzle.
To form the puzzle from the puzzle format illustrated in FIG. 1,
the end thereof having tab A, is folded under along folding axis C
(shown in FIG. 3) and thereafter the end having tab B folded over
along folding axis D (shown in FIG. 4) to form half of the enlarged
interlocked square. The remaining half is formed by folding the end
with tab B along folding axis E over the previously folded part so
the top surface 13 of the puzzle format is on top (shown in FIG. 5)
whereafter the end with tab B is subsequently folded over this
portion along folding axis F to bring tabs A and B together. These
tabs are welded to complete the puzzle and can be formed with a
thickness one half the thickness of the web so a double thickness
is avoided when they are joined. Also during the folding operations
the top surface is folded so its panels are contiguous to one
another and the bottom surface is folded to be contiguous to
itself, as review of the drawings will demonstrate.
As a result of the described folding operations an enlarged
interlocked square is formed, as can best be seen in FIGS. 6 and 7.
The object of the completed puzzle is to convert from the
configuration illustrated in FIG. 6 to that shown in FIG. 7 and
back again by folding permulations.
This is accomplished by folding the enlarged interlocked square
along its diagonal to form a triangle, opening the triangle like a
hat in the middle of its hypotenuse to form a smaller square, which
is then opened to a rectangle. This rectangle may be opened to a
cube tube and then collapsed to rearrange the relationship of the
panels. Thereafter, the sequence is reversed and the result is the
configuration shown in FIG. 7, if the original folding operations
were commenced with the configuration shown in FIG. 6.
* * * * *