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Патент USA US3032794

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May 8, 1962
3,032,784
B. F. RANDRUP
FOLDABLE BOAT
Filed March 21, 1960
3 Sheets-Sheet 1
val-
INVENTOR.
BENJAMIN F RANDRUP
BY
61,4“, mil». ~» wm/
ATTORNEYS
May 8, 1962
B. F. RANDRUP
3,032,784
FOLDABLE‘BOAT
Filed March 21, 1960
3 Sheets-Sheet 5
IN VEN TOR.
BENJAMIN /.- RANDRUP
BY
3,74,, 7/741“: wml
' A T TO/PNEYS
nited States Patent 0
3,932,784
M
1C6
Patented May 8, 1962
2
1
FOLDABLE BOAT
gitudinally extending lower edges to the opposed outer
edges of panels 1 and 2. The forward ends of panels 1
and 2 merge to form a pointed bow, generally designated
Pleasant Hill, Calif.
Filed Mar. 21, 1960, Ser. No. 16,394
15 Claims. (Cl. 9-2)
5, and a transom panel 6 connected to the rear end edges
of panels 1, 2, 3 and 4 encloses the stern of the boat.
One or more thwarts, generally designated 7, extend
3,032,784
Benjamin F. Randrup, 423 Roberta Ave.,
transversely ‘between the side panels 3, 4 for holding said
panels inunfolded or set-up condition.
This invention relates to improvements in foldable
When the boat is in such set-up condition the bottom
boats. Foldable boats of the general type herein de
scribed have been previously disclosed in Letters Patent 10 panels 1, 2 extend generally horizontally from the stem
at transom panel 6 to the bow 5 of the boat. Said bottom
No. 2,504,225, issued April 18, 1950. Such boats are
panels are generally rectangular in shape but are prefer
intended to be folded to a relatively compact ?at con
ably somewhat wider amidships than at their rear ends
dition for storing or transporting and yet are adapted to
at the stern and are formed to pointed forward ends at
be unfolded, in a relatively short time, to a set-up posi
tion for use by ?shermen, campers, sportsmen and the 15 the how 5. Said bottom panels are preferably made from
?at sheet material, such as marine plywood or hardboard
like.
surfaced plywood, and are bent to assume a convex shape
One of the primary problems in prior foldable boat
at their forward end portions. Bottom panels 1, 2 are
construction of this type wherein panels are ?exibly
also preferably oppositely upwardly and outwardly in
joined longitudinally of the boat is the prevention of leak
clined throughout their lengths and have progressively
age in the ?exible joints between such panels which form
greater inclination toward their forward ends (FIGS. 2,
the hull. Another problem that has occurred in such
prior boat construction is that of providing sufficiently
rugged hull members and bracing therefor to withstand
3, 8).
the severe usage to which such boats are subjected in
are preferably made from the same material as bottom
Side panels 3, 4 are generally triangular in shape and
addition to carrying heavy loads, especially outboard mo~ 25. panels 2. Said side panels extend from transom 6 at the
stern of the boat to points short of the pointed how 5
and form the generally upright .sides of the boat. Side
panels ‘3, 4 are convexly outwardly curved and oppositely
upwardly and outwardly inclined near their forward ends
tors and other boat accessories.
It is therefore a main object of this invention to provide
improvements in a foldable boat which overcome the de
?ciencies and disadvantages of prior art construction.
Another object of this invention is the provision of a 30 so as to merge with bottom panels 1, 2 in providing a
hydro-dynamically proper hull. The upper free edges of
foldable boat which may be easily and readily unfolded
said side panels and of the pointed forward ends of bot
from a compact storage condition into a set-up hull hav
tom panels 1, 2 form the gunwales of the boat.
ing improved handling characteristics in the water.
Said upper free edges of side panels 3, 4 may be pro~
It is a further object of this invention to provide a
foldable boat which, when in unfolded or set-up condi v35 tected by a gunwale member 10 (FIGS. 1, 2, 15) in the
form of an elongated member having an inverted, gen
tion is su?‘iciently strong and rugged to withstand sub
stantial loads without danger of collapsing or capsizing.
Still another object of this invention is the provision
of a foldable boat which may be set up to form a com
pletely watertight hull.
Other objects and advantages will become apparent
erally U-shaped cross section. Member 10 is preferably
formed from a resilient material and may have its free
edge marginal portions 11 turned inwardly and upwardly
40 into parallel, spaced relationship for receiving therebe
from the following description taken in connection with
the accompanying drawings in which:
FIG. 1 is a top plan view of the foldable boat of this
invention in unfolded or set-up condition;
tween the upper free edge of side panels 3, 4 (FIG. 15).
Member 10 may be made of su?’iciently resilient material
so that the edge portions 11, and particularly oppositely
inwardly projecting sharp ridges ‘12 on said edge portions,
are held by the resiliency of member 10 in frictional and
gouging engagement with the surfaces of panels 3, 4 for
FIG. 2 is a perspective view of the boat of FIG. 1;
holding member 10 in place against upward withdrawal.
FIG. 3 is a greatly enlarged sectional view as seen from
Outwardly opening notches may be provided in said side
line 3—-3 of FIG. 1;
panels to receive inwardly directed sharp ridges 12 (FIG.
FIG. 4 is a bottom plan view of the boat of FIG. 1;
50 15). Screws 13, projecting through portions 11 and side
FIG. 5 is an enlarged sectional view as seen from line
panels 3, 4 may serve as optional means to hold gunwale
5-5 of FIG. 1;
FIG. 6 is an enlarged sectional view as seen from line
6——6 of FIG. 2;
FIGS. 7 and 8 are enlarged sectional views as seen 65
from lines 7——7 and 8-~3, respectively, of FIG. 4;
FIG. 9 is a greatly enlarged sectional view as seen from
members 10 in place extending along the upper free edges
of said side panels. The gunwale members 10 may ex
tend a few inches rearwardly of the transom 6 to serve
as handles and protective bumpers (FIGS. 1, 2).
Extending along the longitudinal center line of the ‘hull
of the boat between bottom panels 1 and 2 is a keel con
line 9——9 of FIG. 2;
struction, generally designated 14 (FIGS. 1, 4, 7). Said
FIGS. 10, 11, 13 and 14 are enlarged perspective views
of a corner of the stern of the boat of FIG. 2, illustrating 60 keel construction includes the means which ?exibly or
hingedly connect the adjacent longitudinal side edges of
in progressive steps the formation of the watertight cor
bottom panels 1 and 2 in the form of an elongated strip
ner joint;
FIG. 12 is a sectional view as seen from line 12--<12
of FIG. 11, and,
15 (FIG. 7) of ?exible, waterproof material, such as rub
Nylon fabric impregnated
berized fabric or the like.
FIG. 15 is a greatly enlarged sectional view as seen 65 with neoprene is desirable for this use because of its
impregnability to gasoline and oil. It will be noted from
from line 15—15 of FIG. 2.
In detail, referring to FIGS. 1 and 2, the boat of this
invention generally comprises a pair of elongated bottom
panels 1, 2 ?exibly or hingedly connected along their ad
jacent longitudinal edges at the longitudinal center line
of the boat. A pair of elongated side panels 3, 4 are re
spectively ?exibly or hingedly connected along their lon
FIG. 7 that the longitudinal edges of bottom panels 1, 2
are protected and reinforced by elongated angle members
16, one leg 17 of each of which extends along the in
wardly directed edge of its respective bottom panel and
the other leg 18 of which overlies the upper surface of
- said bottom panel adjacent said edge.
3,032,784
3
4
Flexible strip 15 extends across the intervening space
between panels 1 and 2 and has its longitudinal side edges
Furthermore, the boat of this invention may be more
safely used with an outboard motor than conventional
folded inwardly and under legs 18 of angle members 16,
whereby strip 15 may be secured in watertight relation
to panels 1 and 2 by a plurality of rivets 19 extending
through the overfolded portions of ?exible strip 15, legs
boats. Normally the transom depth (from the top of the
transom on which the outboard motor is mounted to the
18, and bottom panels 1 and 2. In addition, a waterproof
bottom of the keel) must be set to accommodate the free
board of the motor (the standard dimension from the mo
tor mount to the motor’s cavitation plate) so that the
adhesive, such as solvent activated, may be applied to the
propeller will be at the correct depth below the bottom
of the boat. In the boat of this invention the depth of
turned under edges of ?exible strip 15 to assure the forma
tion of a watertight joint. Strip 15 is connected in this 10 the'transom panel may be made sufficient to provide a
safe freeboard for the boat (that is, the distance from
manner to bottom panels 1 and 2 along the entire length of
the waterline to the upper edge or gunwale of the transom
their adjacent longitudinal side edges from the bow of the
panel) to prevent backwash into the boat and still ac
boat to its stern and thereby serves to connect said bot
commodate a standard outboard motor mounted on the
tom panels for folding one on the other.
Included in the keel construction 14 of the foldable 15 transom in a conventional manner.
In the foldable boat of this invention each side panel
boat of this invention is an elongated keel member com
3, 4 is hingedly connected to its respective bottom panel
prising an inverted channel 20 (FIGS. 2, 7) having a
1, 2 along the lower longitudinal edge of the side panel
generally horizontally extending central web 21, a pair
and the outer longitudinal edge of the bottom panel 'by
of downwardly depending legs 22, and a pair of ?anges
23 extending oppositely outwardly from the lower edges 20 means such as an elongated strip of ?exible material 30
(FIG. 12). These strips 30 extend along the junctures
of legs 22. Channel 20 is disposed between the longi
tudinal side edges of bottom panels 1 and 2 with web
21 positioned upwardly of the lower surfaces of said
panels when the same are in unfolded condition (FIG. 7).
between the side panels and bottom panels or the chines
means to connect bottom panels 1 and 2 for folding on
panels is substantially similar to that previously described
of the hull for the entire length thereof (FIGS. 1, 2).
Each said strip 301 is folded to a generally G-shaped or
In this position the marginal edge portions of panels 1 25 U-shaped cross section and has its free marginal edges
secured in watertight relation to the respective adjacent
and 2 are received in the outwardly and upwardly open
edges of the associated side and bottom panel. One such
ing angles formed by legs 22 and ?anges 23 and ?exible
securing means, which also provides protection for the
strip 15 overlies the upper surface of web 21.
panel edges, is shown in FIGS. 12, 13 as angle member
An elongated batten 24, of wood or the like, extends
31. One leg of each angle member 31 may overlie a
along the keel in overlying relation to the central portion
marginal edge of strip 31} while the other leg depends
of strip 15 and is secured in place by a plurality of bolts
‘alongside the free edge of the panel to which it is con
or rivets 25 extending through said batten, strip 15, and
nected. Preferably, angle members 31 are secured by
the web 21 of channel 26. Batten 24 serves both to pro
rivets 32 to the panels in this position and a waterproof
tect the upper surface of ?exible strip 15 in the interior
adhesive may be applied, if desired, to insure a secure
of the boat and to connect channel 20 to strip 15 and
and watertight joint. It will be noted that the manner
thence to bottom panels 1 and 2.
of connection of ?exible strip 30 to the side and bottom
This keel construction functions in the manner of hinge
each other to a collapsed position as indicated by dot
dash lines 26 in FIG. 7. When panels 1 and 2 are in the
unfolded condition, indicated in solid lines in FIG. 7,
channel 20 and ?exible strip 15 function to hold the inner
side edges of .said bottom panels in spaced relation and
span the space so formed between the panel edges up
for connection of strip 15 to the bottom panels.
noted in FIGS. 2 and 4 that channel 20 extends rear
these edges are protected by the preferably metallic angle
members 31, damaging contact between the panel edges
vThis method of hingedly or ?exibly connecting the side
and bottom panels not only forms a watertight joint at
the chines of the boat, but also permits each side panel
to fold on its adjacent bottom panel as indicated by dot
dash lines 33 in FIG. 12. When the boat is in unfolded
wardly of the lower surfaces of said panels to provide 45 or set-up condition, the lower edge of each side panel
normally rests on the upper surface of the adjacent bot
an unobstructed downwardly opening groove extending
tom panel adjacent the outer edge thereof. Since both
along the longitudinal center line of the boat. It will be
Wardly from midship to stern and opens outwardly of
the stern to provide such downwardly opening groove
through a substantial length of the keel of the boat.
The provision of a keel on a boat is for the purposes
of increasing the maneuverability and handling charac
and/or with the ?exible strip 30» is prevented.
The adjacent edges of panels 1 and 2, panels 1 and 3,
and panels 2 and 4 are slightly convexly curved so that
when said panels are in the unfolded condition the cen
tral portions thereof tend to spring outwardly. The end
Conventional keels are usually in the
form of a downwardly projecting ridge along the bottom 55 portions of said panels, by the same action, tend to sepa
rate from each other. These tendencies of the panels to
of the boat provivding outwardly facing generally vertical
spring outwardly at their central positions and to spring
surfaces for preventing sidewise slippage of the hull in
apart at their ends would tend to put the ?exible strips
the water. The improved, so-called “inverted” keel of
15 and 30 under tension.
this invention has several substantial advantages over
Such tension may be relieved by connecting the bow
conventional keels, while at the same time providing the 60
ends of panels 1 and 2, 1 and 3, and 2 and 4 by addi
generally vertical surfaces of legs 22 of channel 20 for
tional hinge means in the form of conventional metal
the above mentioned purpose. Since no portion of the
butt hinges for holding said bow ends together with ?ex
keel construction herein described (with the slight ex
ible strips 15 and 30 in a relaxed condition. At the
ception of the very thin ?anges 23) projects below the
stern end ‘angle clips 28 (FIGS. 2, 4, 13, 14) riveted to
bottom panels of the hull, the draft of the herein de 65 the
outer edges of panels 1 and 2 with a leg of each
scribed boat may be considerably shallower than a boat
projecting
upwardly along the outside of panels 3, 4, re
with a conventional projecting 'keel.
spectively, serve to hold the stern ends of panels 1 and 3
The conventional, projecting keel is subject to excessive
and 2 and 4 together with the ends of strips 30 relaxed.
abuse whenever a boat is pulled ashore. The entire
The
construction of transom 6 (to be described) is such
70
weight of such boat usually rests upon a very small area
that it holds the adjacent stern edges of bottom panels
on the bottom of the keel. ‘This has resulted in fraying
1 and 2 together without tensioning the stern end of
or breakage of the usual wood member. In this inven
strip .15.
tion the portion of the boat resting upon the ground is
The central portions of the lower edges of panels 3 and
the relatively ?at metal ?anges 23, thus eliminating the
75 4 are prevented from springing outwardly with respect to
disadvantages of the conventional keel.
teristics thereof.
3,032,784
5
.
the outer edges of panels 1 ‘and 2, respectively, by angle
members 29 (FIG. 12) which are secured to panels 1
and 2 with a leg of each projecting upwardly along the
outside of panels 3 ‘and 4. Angle members 29 thereby
hold panels 3 and 4 in their proper relation to panels 1
and 2 in which strips 30 are not under tension and no
portions of the panels are in engagement with the strips 30.
The transom panel 6 which encloses the stern of the
boat in this invention is preferably formed from a plural
ity of separable panels ‘34, 35, 36 (FIG. 5 ). These panels
may be formed from the same type of material as side
panels 3, 4 and bottom panels 1, 2. The two inner panels
34, 35 overlie one another, when in the set-up condition,
and a ?exible rear end member 37 overlies the outer or
6
strengthening the entire transom panel 6. Panel 36
may also be provided with a forwardly extending lip 45
(FIG. 5) along its upper edge for projecting over the
upper edges of ?exible member 37 and inner panels 34, 35.
When set up the component panels comprising transom
panels 6 are preferably clamped together by means such
as a through bolt 46. The transom panel thus described
is Watertight and strong enough for normal usage, but it
is advisable to provide a transom brace, generally desig
10 nated 47, where an outboard motor is intended to be
mounted on said transom panel.
Brace 47 is preferably fabricated from angle iron or
channel iron and comprises an elongated base member 48
(FIG. 5) secured to the keel '14, as by bolting through
Member 37 may be formed 15 channel member 20 and batten 24. An upright member
49‘ is swingably connected by pivot 50 to the rear end
from the same type of rubberized fabric material as ?ex
of base member ‘48 and is thereby swingable from a col
ible strips 15 and 30 and has its bottom and side periph
lapsed position overlying said base member to a raised
eral edges secured in watertight relation to the rear end
rear surface of panel 35.
edges of the bottom panels 1, 2 and side panels 3, 4
respectively. Outer protective panel 36 extends across
position projecting upwardly alongside the inner surface
of rear end panel 34.
the outer surface of ?exible member 37.
The rear end panels 34, 35 are respectively swingably
An inclined member 51, swingably connected to base
ing strips 33 at the line of connection of the elongated
hinges 38 and each end panel :34, 35 is preferably pro
ber 49. A transversely extending bearing plate 53 may
panel.
A tubular nut 54 with a handle may be threadedly re
member 48 at a point forwardly of its rear end by pivot
52 is similarly swingable from a collapsed position ex~
connected along their generally vertical side edges to side
tending along keel 14 to a bracing position with its upper
panels 3, 4, as by hinges 38 (FIG. 6) for folding thereon.
The side panels may be provided with vertical reinforc 25 end in engagement with the upper end portion of mem
extend over the upper central portion of inner end panel
34 to reinforce the transom panel against the clamping
vided with a vertical strip at the hinge 38 providing an
action of the outboard motor mount. Plate 53 may be
abutment shoulder 40. Panels 34, 35 do not extend
completely across the stern of the boat, but each extends 30 secured either to panel 34 or to upright member, 49, and
through bolt 46 extends through said bearing plate and
from the side panel to which it is hingedly connected into
the upper, engaging ends of brace members 49 and 51.
engagement with the shoulder strip 40 on the other end
ceived on the inner end of bolt 46 for clamping the brace
When unfolding and setting up the boat, the free end
of rear panel 35 is ?rst brought into engagement with 35 member, bearing plate and rear end panels together. An
outer reinforcing plate 55 on the outer surface of panel
the shoulder strip 45 (not shown) on the panel 34 and
36 may be provided if desired.
‘
said latter panel is then swung rearwardly to a position
In prior art folding boats the most di?icult portions in
against rear panel 35 and with the free edge of panel 34
which to provide watertight folding joints have been the
in engagement with the shoulder strip 40 attached to
panel 35. The horizontal extent of ?exible member 37 40 corners where three panels in different plane-s meet. Such
corner joints exist at the junctures between two longitu
is such that it is drawn taut against the outer surface of
dinal panels, one of which is a bottom panel, and the
panel 35 by this interengagement of the panels.
rear end or transom panel. In the boat of this inven
Each panel 34, 35 is also provided along one-half of its
tion improvements have been made in rendering the
lower edge with a projecting lip 41 (FIG. 5) on which
rests the corresponding half of the lower edge of the 45 joints watertight at the rear corner-s of the stern and where
the keel intersects the stern.
other of said panels. The central portion of the lower
At theselocations the ?exible rear end member 37 is
edges of panels 34, 35 are cut away to receive the out
provided with ear portions 56 (FIGS. 9, 13) which pro
wardly projecting keel construction .14 but the remaining
portions of such lower edges, including the oppositely
projecting lips 41 of panels 34, ‘35, engage bottom panels
1, 2 and hold them in the slightly inclined relation shown
in FIG. 2.
ject outwardly from the remainder of the peripheral edge
of said ?exible member. At each of these same locations
tail portions 57 are provided in continuation of and ex
tending rearwardly from the respective ?exible strips 15
and 30 (FIGS. 9, 10, 11 and 13). The ends of the
The connection of the peripheral edges of ?exible rear
strips 15 and 30 are joined in watertight relation
end member 37 to the rear end edges of bottom panels
1, 2 and side panels 3, 4 may be similar to that employed 55 to ?exible rear end member 37 and by rolling ear portions
56 and the respective tail portions 57 together, with ear
for connection of ?exible strips 15 and 30‘. That is, angle
portions 56 on the inside of the rolls thus formed.
members 42 (FIG. 6) may be riveted to side panels 3, 4
As previously ‘described, each of the ?exible strips 15
with one leg of the angle overlying the folded under
and 30 have an inverted, generally U-shaped cross section
peripheral side edge portion of ?exible member 37 and
when the boat is in the set-up condition (FIGS. 7, 12). In
with the other leg of the angle member extending across
order to provide the relatively ?at tail portions which are
the rearwardly directed edge of the respective side panel.
to be rolled with the ear portions 56, each of the ?exible
A pair of similar angle members 43, each approximately
strips 15, 36 must ?rst be folded forwardly on itself and‘
as long as the width of the rear end edge of a bottom
then rearwardly over the previously folded portion While
panel are similarly riveted thereto for securing the under
folded bottom peripheral edge of ?exible member 37 to 65 the extending tail portion 57 is ?attened from its U
shaped cross section. FIGS. 10, 11, 13 and 14 illustrate
said bottom panels. As in the case of ?exible strips 15
the steps which are performed in providing the improved
and 30, an adhesive compound may be spread on the con
watertight corner joint of this invention, and such steps are
nections of member 37 to assure watertight joints.
also illustrative of the formation of the watertight joint
Reverse angle members 44 (FIG. 6) may be secured
back to back with angles 42 on the rear edges of side 70 at the intersection of keel strip 15 and ?exible rear end
member 37.
panels 3, 4 with the legs of angles 44 directed oppositely
By folding the ?exible strip 30 (or 15 as the case may
inwardly, thereby forming channels for receiving the
be) forwardly on itself to form a fold 58 (FIG. 10) and
opposed vertical edges of separate, outer rear panel 36.
then folding it rearwardly over said fold, the tail portion
Panel 36, in this position overlying the rear side of ?exible
member 37, serves to protect the latter as Well as 75 57 assumes a shape that is somewhat inverted (FIG. 11)
3,032,784
7
8
from that which it assumes when connected between the
rivets. The spacer 62 may be individual blocks positioned
at the bolts only.
associated panels (FIG. 12). It is advisable to spread a
suitable adhesive compound on the ?exible strip at this
oyerfolded portion and between said strip and the asso
ciated panels. By this construction the connected panels,
Along the forward, upwardly curved portion of the
such as bottom panel 1 and side panel 3 illustrated in
how an elongated, transversely curved cap strip '65
(FIGS. 3, 4, 8) is secured in overlying spaced relation
to strip 63 by belts 64 and tubular spacers 69. The up
FIG. 11, may be folded on each other without disturbing
wardly and rearwardly inclined outer edges ‘of cap strip
the watertight joint formed by ?exible strip 30 to fold 58.
65 extendover and thereby protect the oppositely inward
ly directed longitudinal edges of panels 1 and 2. A bow
beth sides are placed with their pointed ends under fold 10 cap ‘66 (FIGS. 1-3) may be provided extending over the
50 and extending transversely away from strip 30 along
forward upper end of strip 63 and spacer 62. Bow cap
616 may be secured to strip 65, and obviously, sufficient
the rear edges of panels 1, 3 (or 2, 4). The respective
ear portion 56 is then placed in overlying relationship to
clearance must be provided ‘for the edges of bottom pan
the rearwardly projecting tail portion 57 of member 37
els 1 and 2 for folding the same together as indicated by
and the‘ two are enfolded or rolled together forwardly 15 dot-dash lines 67 in FIG. 8.
toward ?exible member 37 with tail portion 57 on the out
in order to prevent undue spreading of the upper free
edges of bottom panels 1 and 2 at bow 5 by the thwarts 7,
side of the roll thus formed (FIG. ‘13). The roll is
then ?attened on underlying told 58 and clamped or
a generally triangular, ?exible member 68 (FIGS. l-3)
secured to the rear edges of the panels 1, 3 by the over
is permanently secured along two of its peripheral edges
Strips 59 of sponge rubber or the like with adhesive on
lying legs of the angle members 42, ‘43 (FIG. 14) secured
to said upper free edges of said bottom panels. It is not
to said panels by rivets 60. It will be noted that the ends
necessary that deck member 68 extend rearwardly past
the juncture of side panels 3 and 4 with bottom panels 1
of angle members 42‘, 43 overlie the lateral edge portions
of‘ ear portion 56 and tail portion 57 in the rolled joint
fold 58, and strips 59. This construction coupled with
and 2. The transverse extent of deck member 68 is such
that it is pulled ‘taut between the upper edges of panels
the preferable addition of an adhesive compound both to 25 1 and ‘2 when the boat is in the unfolded condition and
the interior of the rolled portions as well as between the
thereby serves to hold the upper edges or gunrwales of
roll strips 59, and the adjacent panels provides a com
pletely watertight corner joint, especially since strips 59
are compressed by angle members 42, 43 and act as ?llers
the panels from undue spreading.
ture of the keel with the stern and the reverse fold 58
In order to hold the bottom and side panels in the
proper shape for forming the hull of the boat, as de
Preferably, deck member 68 is formed from a water
proof material such as rubber impregnated fabric and
between fold 58 and the adjacent panels.
tubular gunw-ale members 70, similar to member 16}, may
Such joint does not interfere in any way with the fold
be secured over the upwardly directed free edges of bot
ing of the associated panels one on the other since the
tom panels 1 and 2 adjacent the connection of deck mem
central portion 61 (FIG. 14) of the rolled ear and tail
ber 68 thereto. If preferred, gunwale members 70 may
portions is-?exible and may be folded in the same manner
be formed of a rigid material and provided with inwardly
35 directed portions 71 (FIG. 1) connected to the comers
asthe remainder of the ?exible strip 30 (or 15).
FIG. 9u-illustrates the rolled portions 56, 57 at the junc
of deck member ‘68 at its rear edge.
which provides the relatively flat tail portion '57. The roll
formed by enfolding portions 56, 57 on ?exible strip 15
and ?exible member 37 is secured in watertight relation
scribed, this invention provides one or more thwarts, gen
to the rear end edges of bottom panels v1 and 2 in a similar
erally designated 7 (FIGS. 1, 2 and 5) which engage
and spread said panels in the set-up condition of the boat.
manner by clamping the lateral edge portions of said roll
under the ends of angle members 43. Filler strips, such
‘Each of said thwarts extends transversely of the boat
as ‘58, may also be incorporated under the edge portions
of such roll. This joint is similarly provided with a
comprises an elongated seat ‘member 72 which has its
amidships between side panels 3 and 4 and preferably
45
?exible central portion so that the bottom panels 1, 2 may
befolded on each other.
In the case of each such joint, since the ?exible strip
is secured in watertight relation to the panels which it
connects up to the point where the ?exible ‘rear end 50
member 37 is so secured to the panels, the joining or en
folding of the strip and the ?exible rear end member into
watertight relation forms a completely watertight, yet
foldable connection.
The keel construction previously described is somewhat 55
modi?ed near the forward end 01' bow of the boat.
It
is not necessary to provide the downwardly opening chan
nel near the bow since the forward portion of the boat
is often out of the water especially at increased speeds.
opposed ends received in oppositely inwardly opening
sockets 73 secured to or formed in said sidewalls. Two
or three of such seat members may be provided and the
transverse extent thereof is such as to spread the side
panels 3, 4- again'st their inherent resiliency to form the
oppositely outwardly curving sides of the boat (FIGS.
1, 4). Seat members '72 are preferably independent and
separable from the remainder of ‘the boat and may be
inserted in the sockets 73 by springing side panels 3, 4
‘outwardly against their own resilience. Obviously, the
resiliency of said side panels will serve to retain the ends
of seat members 72 in sockets 73.
Hin-gedly cone'cted to each seat member 72, as by
hinge 74 (FIG. 5) is a transverse member or frame 75
swingable from a position lying along the underside of
The batten 24- and ?exible strip 15, connected in the man 60 seat member 72 to an unfolded position depending there
from with its lower edge 76 adjacent bottom panels 1, 2.
ner described to bottom panels 1, 2, preferably extend for
In such unfolded position frame 75 extends in a gene-rally
wardly all the way to the pointed how 5 as shown in
vertical plane transversely of the boat with its vertical
FIGS. 3, 8. Channel 20, however, may terminate rear
side edges adjacent side panels 3, 4.
‘wardly of bow 5 and in its place an elongated spacer
.A latch means is provided which prevents the side pan
member 62 (FIG. 3) extends along the longitudinal cen 65
els 3, 4 from spreading when ‘the ‘transverse member '75
ter line of the boat under ?exible strip 15. A flat strip
is in the ‘unfolded position (FIG. 5 ) . A slotted element 9,
63, preferably of metal or other rigid material, ‘extends
secured to each side panel is adapted to receive a tongue
along the other surface of spacer member 62 from the end
8 secured to each edge of member 75 when "said member
of channel 20 to the upper forward corners of panels 1, 2 70 is moved into the unfolded position. This engagement
at bow 5 (FIG. 4). The rear end of strip 63 may be
of tongues 8 in the slots in elements 9 prevents spreading
riveted to the forward end of channel 20 (FIG. 4) and
of the side panels 3, 4.
'
the remainder of said ?at strip is secured together with
Frame 75 is held in said unfolded position 'by releas
spacer '63, the central portion 'of ?exible strip 15, and
able latch means 77 which provide a pair of opposed
batten 24 by a plurality of spaced bolts 64 (FIG. 8) or 75 ?anges 78, 79 adapted to receive lower'edge 76 ‘there
3,032,784
between. Latch means 77 is secured to keel construction
14 and one of said ?anges 78, 79 is mounted for move
ment away from the lower edge 76 of frame 75, prefer
ably as by mounting it on a hinge leaf 80. By swinging
hinge leaf 80 and ?ange 79 oppositely away from the
latched position shown in FIG. 5, frame 75 may be
swung upwardly and removed with seat member 72 in
the manner described.
When frame 75 is in the unfolded, downwardly de
10
opening elongated groove along the central bottom of
said boat.
'3. In combination with a foldable boat having a pair
of elongated bottom panels ?exibly connected along their
adjacent longitudinal side edges, a keel member, com
prising: an elongated inverted channel having a web
and downwardly depending legs extending along said side
edges and disposed with said web positioned upwardly of
the lower surfaces of said bottom panels when the same
pending position, ?anges 78, 79 embrace the lower edge
10 are in unfolded position thereby providing a downwardly
76 thereof and securely hold it in place. It is advan
tageous to form hinge leaf 80 to a slightly bowed, spring
said boat, said channel extending from the rear end of
opening elongated groove along the central bottom of
said panels forwardly and opening rearwardly of the
construction whereby ?anges 78, 79 will yieldably engage
stern of said boat.
the opposite sides of frame 75 at its lower edge. The
4. In combination with a foldable boat having a pair
remaining portions of the lower edge of each frame 75 15
of elongated bottom panels and ?exible connecting means
may be formed to a contour corresponding to the desired ‘
contour of bottom panels 1, 2 (FIG. 2) so that frames
'75 assist in forming said bottom panels to the bowed
connecting said panels along their adjacent longitudinal
side edges, a keel member, comprising: an elongated in—
verted channel member having a central web, a pair of
In folding the boat of this invention from its set-up 20 spaced downwardly depending legs, and a pair of oppo
sitely outwardly extending ?anges at the lower edges of
condition shown in FIGS. 1 and 2, the frames 75 are ?rst
said legs, and means securing said channel to said con
unlatched and swung to a generally horizontal position
necting means with said side edges of said bottom panels
and then the seat members 72 removed by springing side
in unfolded condition respectively received in the out
panels ‘3, 4 outwardly to permit removal of the ends of
the seat members from sockets 73. The next step is the 25 wardly and upwardly opening angles formed by said legs
and said ?anges thereby providing a downwardly opening
disassembly and collapsing of transom panel 6 and in
longitudinal groove in the central bottom of said boat.
cludes removing through bolt 46, collapsing transom
5. In combination with a foldable boat having a pair
brace 47, as described, and removing outer panel 36
of elongated bottom panels and ?exible connecting means
from angle members 44. The thwarts 7 and outer panel
connecting said panels along their adjacent longitudinal
36 are the only structural members which are separate
side edges, a keel member, comprising: an elongated in
and independent from the remainder of the boat.
verted channel member having a central web, a pair of
in further folding the boat of this invention the inner
spaced downwardly depending legs, and a pair of oppo
rear panels 34, 35 are then folded oppositely into
sitely outwardly extending ?anges at the lower edges of
overlying relation with the side panels 3, 4 to which they
are hingedly connected. Said side panels with rear panels 35 said legs, and means securing said channel to said con
necting means with said side edges of said bottom panels
34, 35 adjacent thereto are then folded oppositely inward~
in unfolded condition respectively received in the outward
1y on their respective bottom panels 1, 2. Flexible rear
ly and upwardly opening angles formed by said legs and
end member 37 is then pulled rearwardly out of the way
said ?anges thereby providing a downwardly opening
and deck member 68 tucked inwardly while bottom panels
1, 2 are folded upwardly and together with side panels 3, 40 longitudinal groove in the central bottom of said boat,
said channel extending from the stern of said boat to
4 and rear panels 34, 35 folded therebetween.
con?guration described against their inherent resiliency.
The boat of this invention may thus be folded to a
compact unit for transporting or storage purposes. When
approximately midship.
6. In a folding boat, a pair of elongated panels at least
folded the boat of this invention occupies a space of ap
one of which is a bottom panel, a ?exible strip secured in
in FIG. 2 ready for use. When in the unfolded condition
this boat is su?iciently strong and braced to Withstand
considerable rough usage and the carrying of substantial
of said panels adjoining said side edges for extending
proximately six inches by 24 inches by the length of the 45 watertight relation to the adjacent longitudinal side edges
of said panels for hingedly connecting the same, a ?ex
boat. In a matter of minutes one man can unfold the
ible rear end member, means securing the peripheral edges
boat of this invention and set it up in the condition shown
loads while remaining completely watertight.
Although the improved boat has been herein described
of said member in watertight relation to the rear end edges
across and enclosing the stern of the boat when said panels‘
are in unfolded condition, and the rear end portion of said
strip being joined in watertight relation to said member
for forming a watertight joint between said panels and said
in some detail, ‘such is not to be taken as restrictive thereof
member.
since modi?cations which would occur to one skilled in
7. In a folding boat, a pair of elongated panels at least
the art are intended to be within the spirit and scope of 55
one of which is a bottom panel, a ?exible strip secured
the invention.
I claim:
1. In a foldable boat, a pair of elongated bottom panels,
in watertight relation to the adjacent longitudinal side
edges of said panels for hingedly connecting the same, a
?exible rear end member, means securing the peripheral
edges of said member in watertight relation to the rear
end edges of said panels adjoining said side edges for ex
tending across and enclosing the stern of the boat when
ning the space between said side edges upwardly of the
said panels are in unfolded condition, said member having
lower surfaces of said panels when the same are unfolded
a projecting ear portion adjacent said side edges of said
for providing an unobstructed, downwardly opening
and the rear end portion of said strip being en
groove extending longitudinally centrally of the bottom 65 panels,
folded with said ear portion into a watertight joint.
of said boat.
,
8. In a folding boat having a pair of elongated bottom
2. In combination with a foldable boat having a pair
panels, a ?exible keel strip connecting said panels in water
hinge means connecting said panels along their adjacent
longitudinal side edges and including rigid means holding
said side edges in spaced relation, said hinge means span
of elongated bottom panels ?exibly connected along their
tight relation along their adjacent longitudinal side edges,
adjacent longitudinal side edges, a keel member, com 70 a pair of elongated side panels, ?exible chine strips respec
prising: an elongated inverted channel having a web and
tively connecting said bottom panels and said side panels
downwardly depending legs extending along said side
edges and disposed with said web positioned upwardly of
in watertight relation along the oppositely outwardly dis
posed edges of said bottom panels and the respective lower
‘the lower surfaces of said bottom panels when the same
longitudinal edges of said side panels, and a ?exible mem
are in unfolded position thereby providing a downwardly 75 ber enclosing the stern of the boat and having its periph
3,032,784
1l
eral edges secured in watertight relation to the rear end
edges of said bottom panels and said side panels, water
tight corner joint construction comprising: at the junctures
between said side panels, said bottom panels and said
member, an ear portion formed on said member and pro
jecting from said peripheral edge, a rearwardly project
ing tail portion formed in continuation of the adjacent said
12
tom of the boat when unfolded, an elongated side panel
?exibly connected along its lower longitudinal side edge
of each said bottom panel for folding thereon and for
forming the generally upright sides of the boat when un
folded, a transom panel, means for connecting said tran
som panel to the rear end edges of said side and bottom
panels for enclosing the stern of the boat, an elongated
base member secured to and extending along said keel
strip and interfolded with said ear portion, and means se
member forwardly from the stern, an elongated upright
curing said ear portion and said tail portion in said inter
folded condition.
10 member swingably connected to the rear end of said base
member for swinging from a collapsed position extending
9. In a folding boat having a pair of elongated bottom
along said base member to a raised position lying along
panels, a ?exible keel strip connecting said panels in water
side said transom panel for bracing the same, an inclined
tight relation along their adjacent longitudinal side edges,
member swingably connected to said base member at a
a pair of elongated side panels, flexible chine strips respec
tively connecting said bottom panels and said side panels 15 point forward of its‘ said rear end for swinging from a col
lapsed position extending along said base member to a
in watertight relation along the oppositely outwardly
bracing position extending into engagement with said up
disposed edges of said bottom panels and the respective
right member, and releasable means for securing said up
lower longitudinal edges of said side panels, and a ?exible
right member and said inclined member to said transom
member enclosing the stern of the boat and having its pe
panel.
ripheral edges secured in watertight relation to the rear
13. A folding boat comprising: a pair of elongated
end edges of said bottom panels and said side panels,
bottom panels, an elongated keel member, means ?exibly
watertight corner joint construction comprising: at the
connecting the adjacent inner longitudinal side edges of
junctures between said side panels, said bottom panels and
said bottom panels to said keel member for folding on
said member an ear portion formed on said member and
each other and for forming the generally horizontal bot
projecting from said peripheral edge, a rearwardly pro
tom of the boat when unfolded, an elongated side panel
jecting tail portion formed in continuation of the adjacent
?exibly connected along its lower longitudinal side edge
said strip, said ear portion and said tail portion being
of each said bottom panel for folding thereon and for
rolled together with said tail portion on the outside of the
forming the generally upright sides of the boat when un
roll thus formed, and means holding said ear portion and
30 folded, a transom panel, means for connecting said tran
said tail portion in ?attened, rolled condition.
som panel to the rear end edges of said side and bottom
10. In a folding boat, a pair of elongated panels at least
panels for enclosing the stern of the boat, an elongated
one of which is a bottom panel, a ?exible strip secured in
base member secured to and extending along said keel
watertight relation to the ‘adjacent longitudinal side edges
member forwardly from the stern, ‘an elongated upright
of said panels for hingedly connecting the same, a ?exible
member swingably connected to the rear end of said base
rear end member, means securing the peripheral edges of
member for swinging ‘from a collapsed position extend
said member in watertight relation to the rear end edges
ing along said base member to a raised position lying
of said panels adjoining said side edges for extending
alonside said transom panel for bracing the same, an in
across and enclosing the stern of the boat when said panels
clined member swingably connected to said base member
are in unfolded condition, said member having a project
ing ear portion adjacent said side edges of said panels, said 40 at a point forward of its said rear end ‘for swinging from
a collapsed position extending along said base member
strip being secured to said panels in a manner to provide
to a bracing position extending into engagement with said
an inverted generally U-shaped cross section and having
upright member, and releasable means for securing said
its rear end portion folded forwardly on itself and then
upright member and said inclined member to said transom
rearwardly to provide a rearwardly projecting, upright,
generally ?attened U-shaped tail portion underlying said 45 panel, said transom panel being formed from a plurality
of superposed separate sheets, and said releasable means
ear portion, and said portions being rolled together with
extending across and clamping together said sheets, said
said tail portion on the outside of the roll thus formed
upright member and said inclined member.
thereby providing a watertight joint between said panels
1-4. A folding boat comprising: a pair of elongated bot
and said member.
tom panels, an elongated keel member, means ?exibly
11. A folding boat comprising: a pair of elongated bot
tom panels ?exibly connected along their adjacent inner
longitudinal side edges for folding on each other and when
unfolded extending forwardly and upwardly from the
stern of the boat to the bow, said bottom panels having a
convex shape and being oppositely upwardly and outward
ly inclined to form a pointed bow, an elongated side panel
?exibly connected along its lower longitudinal side edge
connecting the adjacent inner longitudinal side edges of
said bottom panels to said keel member for folding on
each other and for forming the generally horizontal bot
tom of the boat when unfolded, an elongated side panel
?exibly connected along its lower longitudinal side edge
of each said bottom panel for folding thereon and vfor
forming the generally upright sides of the boat when un
folded, a transom panel, means for connecting said tran
to the outer longitudinal side edge of each .said bottom
som panel to the rear end edges of said side and bottom
panel for folding thereon and when unfolded extending
generally upright from the stern to its forward end short 60 panels for enclosing the stern of the boat, an elongated
base member secured to and extending along said keel
of the bow, said side panels being convexly outwardly
member forwardly from the stern, an elongated upright
curved and oppositely upwardly and outwardly inclined
member swingably connected to the rear end of said base
near said forward ends, thwarts extending transversely be
member for swinging from a collapsed position extending
tween Said panels for holding the same in unfolded co
dition, and a ?exible deck member permanently secured to 65 along said base member to a raised position lying along
side said transom panel for bracing the same, an inclined
the upper free edges of said bottom panels forwardly of
member swingably connected to said base member at a
said forward ends of said side panels and extending over
point forward of its said rear end for swinging from a
the bow, said deck member being taut when said panels
collapsed position extending along said base member to
are held in unfolded condition for preventing spreading
70 a bracing position extending into engagement with said
of said bottom and side panels.
upright member, and releasable means for securing said
12. A folding boat comprising: a pair of elongated
bottom panels, an elongated keel member, means ?exibly
connecting the adjacent inner longitudinal side edges of
upright member and said inclined member to said tran
som panel, said transom panel being formed from a plu
rality of superposed separate sheets, a rigid bearing plate
said bottom panels to said keel member for folding on
each other and for forming the generaly horizontal bot 75 extending transversely of said transom panel and super
assays‘;
13
posed over the upper central portion thereof interiorly of
the boat, and said releasable means including a bolt ex
tending through said sheets, said plate and said upright
and inclined members and threaded to receive a nut for
clamping the same together.
15. A folding boat comprising: a pair of elongated
bottom panels ?exibly connected along their adjacent
14
ends received in said sockets and having a length sui?cient
to spread said side panels in unfolded condition against
their inherent resiliency, and a frame swingably connected
to said thwart for swinging to an unfolded position de
pending therefrom with its lower edge adjacent said bot
tom panels, and means releasably securing said frame in
said unfolded position, said means including a pair of op
posed ?anges connected with said bottom panels and
inner longitudinal side edges for folding on each other and
adapted to receive said lower edge of said frame there
when unfolded extending forwardly and upwardly from
the stern of the boat to the bow, said bottom panels hav 10 between, at least one of said ?anges being mounted for
movement away from said lower edge of said frame to
ing a convex shape and being oppositely upwardly and
permit swinging of said frame away from said unfolded
outwardly inclined to form a pointed bow, an elongated
position.
side panel ?exibly connected along its lower longitudinal
side edge to the outer longitudinal side edge of each said
‘bottom panel for folding thereon and when unfolded ex 15
References Cited in the ?le of this patent
tending generally upright from the stern to its forward
UNITED STATES PATENTS
end short of the bow, said side panels being convexly
outwardly curved and oppositely upwardly and outwardly
352,420
inclined near said forward ends, a transom panel, means
1,760,673
1,861,048
2,353,013
2,408,579
2,504,225
for connecting said transom panel to the rear ends of 20
said side and bottom panels for enclosing the stern of the
boat, oppositely inwardly opening sockets provided on
said side panels intermediate their said ends, an elongated
thwart adapted to extend transversely of the boat with its
Martin _______________ __ Nov. 9, 1886
Van Hoorn ___________ __ May 27,
Conover _____________ __ May 31,
Clark _________________ __ July 4,
Randrup ______________ __ Oct. 1,
Randrup _____________ __ Apr. 18,
1930
1932
1944
1946
1950
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