Oct- 1‘, 1946» ‘ B. F. RAYNDRUP FOLDABLE BOAT 2,408,579 ' Filéd May 22, 1944 , ' s Sheets-Sheet 1 +2151 INVENTOR, A TTORNE K Oct. 1', 194a. ' B. F.’ RANDRUP ' ‘ 2,408,579 FOLDABLE BOAT IFiied' Kay 22, 1944 - _s sheets-sheet s 1k A 7' TORNE Y. ‘2,408,579 Patented Oct. 1‘, 1946 UNITED ' STATES ‘ PATENT 1 OFFICE ' ' 2,408,579’ I .7 ' 'FOLDABLE BOAT . , 7 7 ‘Benjamin- F. Randrup, Brisbane, Calif. Application May 22, 1944, Serial No. 536,811 5 Claims. (01. 9-2) 1 ing boats. , . ‘ ‘ g of Fig. 6; . Fig. 8 is an enlarged detail section showing the manner in which the end members are secured An object of my, invention is to provide a fold? able boat embodying a ‘construction capable of being readily collapsed and folded intoa compact 5 to the sides of the boat; 1 I I ' Fig. 9 is an enlarged sectional view taken’ on form for convenience in handling; storage‘ or transportation. Another object of my invention, is 2 ,Fig. 7 is a vsectionalview taken on the line '|—‘! This invention relates to improvements in fold- ‘ Y the line 9—9_of Fig. 2; . ;_ Fig. 10 is an enlarged sectional View taken on to provide > a foldable boat having longitudinally disposed bottom and sidejmemb'ers which'are- articulately the line Ill-40 of Fig.2.; connectedalongltheirfcontiguous edges, whereby ‘ “ the line lI-ll of Fig. 2; 1 I 5 ~ Fig. 12 is an enlarged side elevation of one of ‘ Fig. 11 isan enlarged sectionalrview taken on the parts may be readily unfolded from acol the hinges employed in connecting certain parts lapsed form into a rigid boat ‘structure wherein the parts are ?rmly secured in extended positions ' of the boat together and maintaining, them in and so locked that there is no danger of accidental 15 ioldable collapse. , ‘ ' I _ ‘ wherein , . Fig. 14 is a diagrammatic vplan view showing a‘number of the boats connected'end to end to assembled and‘operable form, provides a rigid and structure } ‘a, collapsed or folded gformi A further object of my invention is to provide a folding or collapsible :boatgwhich, when in an seaworthy relationship; Fig. 13 is a sectional View showing the :boat in considerable 2,0 form a supporting structure for a bridge; and Fig. 15 is a side elevational view of the con a amount of material and a number of persons may nected Iboats shown in Fig. 14-.’ be safely carried without likelihood of. damage or injury from leaks, .capsizing or foundering. Referring to the drawings, the numerals I and 2 designate two elongated bottom members which Other and further.‘ objects of my invention will be pointed out hereinafter, indicatedin; the ap 25 are ?exibly connected together along their ad jacent longitudinal side edges by an intervening pended claims, or will be obvious to one skilled in the art upon an understanding of the present strip 3 of ‘waterproof fabric, such as canvas. . The disclosure. For the purpose of this application, I have elected to show herein certain forms and bers at their upper‘ sides :by means of nailed, glued, waterproof strip 3 is secured to the bottom mem details of a folding boat representativeof my_in 3.0 or otherwise suitably secured battens 4'. Overly; vention; it is to be understood, however, that the ' ing the strip 3 is a ‘rigid longitudinal member 5. Secured to andunderlying ‘the strip 3 is a rigid > embodiment of my invention herein shown. and longitudinally disposed'member 6 _iwhich is'nor¢ mally engaged at its opposite, side edges by the described is for the purpose of illustrationonly, and that therefore it is not to .be regarded as exhaustive of the variations of theinvention, nor ~ .35 lower inner side edges of- the bottom members ' [l and 2 (seeFig..5). Secured to and underlying is it to be given an interpretation such as might the member 6 is'a, lower longitudinally disposed member 1 which. normally extends" across the longitudinal space separating 'the inner edges of the bottom members. The lower member 1 pro. have the e?ect ‘of limiting the claims short of the true and most comprehensive scope of the inven tion in the art. . _ In the accompanying drawings: . ' " ~Fig. 1 is a side elevation of afolding or. col; lapsible boat embodying the preferred principles of my invention; ' ' ' ~ ' ‘ ' Fig.2 is a plan view of the same; Fig. 3 is an endview of the ‘same; ' I - - vides a support for the inner edges of thebottom members I and 2 and at the same. time it forms rigid protecting means fornormally preventing damage to the'keel area of the boat when land ings are made. The bottom'members l. and 2. are 45 made preferably from ?at ‘panels of ‘plywood or Fig. 4 is an enlarged sectional view taken on the line 44-4 of Fig. 1, showing the manner‘in which the bottom and side members are fastened other suitable material, and'each is substantially, ' rectangularwinlshape. When the boat is unfolded ' and 'set' up'and the various ‘parts are in assem bled cooperating positions, the bottom members vFig. 5 is an enlarged sectional 'v'iéwgtak‘en 'on 50' ‘I and 2 are slightly inclined in opposite directions. Flexibly connected to the outer‘ edges of the the line 5-5 of Fig. 2,'showing themanner'in (bottom members land 2, respectively, are elon Which the bottom of the boat is constructed; together; ‘ ' ‘ }_ - T v ‘ - Fig. 6 is an enlarged side elevation of one of the, car looks; I I 1 55 gated side members 8 and 9. The adjacent edges of the bottom and side members are connected 4 together by waterproof strips W of canvas or other suitable material. The ?exible strips 19 are se cured to the inner surfaces of the side and bot tom members by nailed, glued or otherwise suit ably attached battens H, The side and bottom the boat alongside one another. Hinged as at 23 to the lower portions of the frame members members when in unfolded and set up positions side members 8 and 9. When the boat is being set up it becomes necessary to exert an inner 20 are horizontal seats 24 which extend across the interior of the boat and are supported at their opposite ends by strips 25 secured to the are arranged so that the lower edge of each side member rests on its associated bottom member. pull upon the upper edges of the side members 3 and 9 in order to bring the- side and bottom The particular battens H which are secured to the bottom members i and 2 provide abutments 10 members into their proper relative positions as well as into ?rm engagement with the U-shaped to prevent the lower edges of the side members ribs. The preferred means used to accomplish from engaging with the ?exible strips l6. Such .this result comprises a number of three-piece clamps 26 (see Fig. 9) of the kind employing a side and it still permits the folding of the‘mem 15 principle commonly used in trunk latches to se cure the lid to the main body. The clamps are bers one upon another in a most satisfactory mounted on the upper ends‘of the angular frame manner. members 20, and each clamp is adapted to engage Hinged as at 12 to the bottom member v2 is a with an upwardly disposed member 27 secured to centrally disposed member (3 (see Fig. 5) which normally overlies the longitudinal member 5 and 20 the upper edges of the side members 8 and 9, and by swinging the lever members of the clamps provides a rigid ?oor piece for protecting the inwardly, the side members 8 and 9 at their up ?exible connecting strip .3 against damage from per edges are ‘drawn toward each other and into within. The stern and bow of the boat are constructed . ?rm engagement with the frame members 28, a connecting means for the bottom and side mem-. . . . hers is well protected from damage from the out substantially alike and each comprisesa ?exible 25 thereby forming‘ a rigid construction throughout the length of the boat. Secured as by a universal hinge '28 (see Fig. 10) to the longitudinal member 5' at each end of the boat is a centrally disposed brace 29 which ex end member it of waterproof material such as convas which is somewhat rectangular in shape. The lateral and lower edges of the end members [4 are secured to the bottom members i and 2 and to the side members 8 and 9 by spaced glued tends longitudinally to the end panel H. The braces 29 are each normally disposed in a ver or nailed battens M’ or other suitable means tic'al plane and an end thereof is secured to the end panels [6 and IT by a bracket 28' and one 0;‘ the same bolts I8 which normally holds the said Secured as by universal hinges 15 (see Fig. 11) 35 panels in engaging relationship. Each brace 29 provides a rigid reenforcing structure for an end to the opposite endsv of the bottom members i of the boat, and if desired it may serve as a sup and 2, respectively, are rigid end panels !6 and port for an outboard motor or other device. i‘! which are each of su?cient- length to extend At opposite sides of the boat, on the upper edges across an end of the boat. When the boat is in a set up position the end panels it and H are 40 of the side members 8 and 9 are mounted oar locks 36 which are adapted to drop from an up lodged at their opposite. ends between the bat wardly extending position to one wherein they tens M' which are secured to the side members are positioned against the said side members (see 8 and 9. (See Fig. 8.) The hinges l5 are so Fig. '7) . The car locks are each provided with an constructed and arranged as to permit the end upper opening for the insertion of an oar and panels l6 and i"! to ‘be removed from engaging witha lower opening for the engagement of a positions between the spaced battens la’ without bracket 3| which serves as means for securing detachment from the bottom members i and 2 the oar lock to the side member. when‘ the boat is to be collapsed and folded. The At opposite sides of the boat near thetwo ends end panels I6 and I‘! are normally positioned in lengthwise engagement with each other. They 50 thereof are arranged four foldable buoyant mem which will prevent water from entering where the end members engage with the side and bot tom members. provide rigid stiffening members for maintain bers 32 which are suitably secured to the upper ing ‘the bottom and side members in their un folded respective normal positions, and at the areas ofthe'side members 8 and E3.v (See Figs.2, ' 3 and 11.)- Each of' the buoyant members is pref erably provided with‘ahinged side 33, canvas same time they maintain the ?exible end mem ends 33’ and a pivoted’ top 34 which has a hinged door 35. I vThe side 33 of the buoyantmember is movably connected at its lower end by a water proof strip to a side member 9, and a similar hinge boat is collapsed. When extended across the ends connection is provided between the topiili and of the boat; the end panels l6 and H are se cured together at one or more pointsby bolts I8 ‘60 the side 33 as‘well as between the door '35 and the side member. The hinged door is provided or other suitable means. with a ‘latch 36 for holding the door and the top Extending across the interior of the boat in 34 in connected relationship. The interior vof engagement with the side members are pairs of angular frame members 29, which form rigid " each buoyant member has an air chamber which U-shaped ribs or frames for maintaining the side 65 is'adapted to provide suitable buoyancy to pre vent the capsizing of the boat in rough waters. and bottom members in extended positions. The bers ‘M in taut, protected positions. The end panels [6 and ll’ ‘are adapted to fold against‘ the bottom members I and 2, respectively, when the 55 tommernbers as by universal hinges 2i ' (see Figs. ' VVhenr folded the door drops downwardlyv against the sideimember 9, the top-34 drops downwardly 9 and 12) which permitlthe folding of the said against the inside surface of 33, and the latter angular frame members are connected to the bot frame members against vthe bottom members. 70 with the canvas ends 33' tucked inwardly is positionedin closs proximity to the said mem The upwardly disposed parts of the frame mem bers 2B are normally lodged between spaced strips 22 secured to the inside surface of the side mem ber. bers Band 9.. The lower portions of the frame . members of each pair extend across the bottom of 75 ‘ > > As shown in Figs. 14 and 15, the ends of sev eral boats may be connected as by interlocking means 31 to provide an elongated supporting 2,408,579 5 6 structure for a pontoon bridge. ‘When so con nected together, the boats provide a semi-rigid structure capable of supporting a considerable weight. ' ' The universal hinges 15, 2| and 28 are provided, as shown in Fig; 12, with a plate looped member 39 on said plate, a pin 40 nected to the looped member, and a second each 33, a con plate 4| having an eye or opening Within which the ally connected to and foldable upon the frame members. _ > ' 2.'In' a collapsible boat, a pair of elongated bottom members ?exibly connected together lon gitudinally along‘ adjacent side edges, two elon gated side members ?exibly connected to the ‘ outwardly disposed longitudinal edges of the bottom members, the side members each being arranged to fold upon its associated bottom mem pin is rotatably mounted and held. The free 10 ber, foldable end members pivotally connected to and foldable upon the bottom “members, the . movement of the pin 49 with respect to the looped said end members being arranged in pairs and member 39, and the free movement of vthe second each pair being positioned toclose an‘ end of the plate 4| about the pin 4!) permits the members boat, rigid frame members connected to and to which the plates are secured to assume various positions with respect to one another. Thus the 15 foldable upon the bottom members and normally interposed between the side members for main frame members 20, the end members l5 and I‘! taining them in separated positions, and seats and the braces 29 are respectively held in a conpivctally connected to the frame members and I nected position with respect to bottom members arranged to fold thereupon. I and 2 and the longitudinal member 5, both when the boat is in a set up position'and when it is 20 ‘ 3. In a collapsible boat, means for connect ing an elongated side member to an elongated bottom member comprising a ?exible strip inter When the boat is to be collapsed for conven ’ posed between adjacent longitudinal edges of the ience in carrying, storage or handling, the clamps side and bottom members, and longitudinally 26 and the bolts l8 are ?rst disconnected, follow ing which the frame members 20 making up the 25 disposed battens securing the strip to- the side folded. ' ‘ , U‘-shaped ribs, the braces 29 and end panels 15, and I‘! are folded against the bottom members i and 2. The buoyant members 32 are collapsed and bottom members, the battens and ?exible strip being arranged on the inside of the boat and one of the battens being positioned to provide an abutment for the longitudinal edge of the side and positioned alongside theside members 8 and 9. The seats 24, previous to the folding‘ of 30 ‘member when the boat is in an unfolded opera tive position. the frame members 20, are folded against the latter. The side members I, and Z are swung inwardly against their associated bottom mem bers 8 and 9, and each of the latter, together with the aforementioned parts connected there to, are then folded upwardly toward each other. The ?exible end members 14 are tucked inwardly 4. In a collapsible boat having ?exibly con nected elongated side and bottom members, means for connecting a longitudinal side edge of a bottom member with an adjacent longitudinal side edge of a side member, comprising a ?exible strip arranged interiorly and disposed between ranged and connected together, the time required ‘to assemble the structure into an operable boat is but a few minutes. the adjacent longitudinal edges of the side and bottom members, two longitudinal battens en gaging with the lateral longitudinal edges of the strip, one being secured to the bottom member and the other to the side member, the particular batten secured to the bottom member being ar ranged to engage with the aforesaid longitudinal 45 edge of the side member when the boat is in an unfolded operative position, whereby lateral Having described my invention, what'I claim . strains on the strip are reduced and contact between the adjacent side members, and a suit-' able cord or‘other means is then extended around the folded structure to maintain the various parts of the boat in a collapsed form. Owing to the novel manner in which the parts are ar therewith-from the outside is avoided. 5. In a collapsible boat comprising longitudi bottom members ?exibly connected longitudi 50 nally connected ‘side and bottom members ar nally along adjacent side edges, two elongated ranged for folding one upon another, the side side members ?exibly connected to the outwardly members being arranged in upstanding positions disposed'longitudinal edges of the bottom mem with respect to the bottom members with their lower longitudinal edges resting on the bottom bers, the said side members each being arranged to fold upon its associated bottom member, fold 55 members, ?exible strips positioned interiorly of the boat and arranged to form a water-tight ?ex able end members pivotally connected to and fold ible joint between the adjacent longitudinal’ able upon the bottom members, the said end mem bers being arranged in pairs and each pair being edges of the bottom and the side members, and longitudinally disposed battens positioned inte positioned to close an end of the boat, and a plu 1S1 ‘ 1. In a collapsible boat, a pair of elongated rality of pairs of rigid frame members pivotally 60 riorly for securing the ?exible’ strip to the bot tom and side members, vthe said battens securing connected to and folded upon the bottom mem the strips to the bottom members being, arranged bers and normally interposed between the side and bottom members for maintaining them in unfolded positions, the pairs of rigid frame mem bers each comprising two angular members con nected to the bottom members andv arranged to engage with the side members, and seats pivot to engage with the lower edges of the side mem bers, whereby the said side members are pre vented from shifting beyond certain points and thereby exerting strains in the ?exible members. BENJAMIN F. RANDRUP.