Abstract:
An amphibious vehicle is disclosed including at least one outrigger pontoon member connected with the vehicle body for pivotal movement about a horizontal longitudinal pivot axis between retracted and laterally extended positions relative to the vehicle body. The pivot axis is adjacent the bottom portion of the vehicle body, seal means being provided for sealing the space between the vehicle body and the pontoon member.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an amphibious vehicle which is used either alone or in combination with a plurality of other vehicles to form a floating bridge. 
     2. Description of the Prior Art 
     Amphibious vehicles which form a floating bridge are known in the prior art as evidenced, for example, by the patent to Gehlen et al U.S. Pat. No. 3,152,569, which discloses an amphibious vehicle including a floating main body, and a pair of auxiliary floats which are pivotally connected with the main body for movement between an upper storage position in which the floats rest on the deck, and a lower position in which the floats extend laterally from the main body. The known amphibious bridge devices have shortcomings in that the bridge sections and floats are usually stored on the deck of the vehicle during transport, thereby causing the vehicle to be bulky and unstable. 
     SUMMARY OF THE INVENTION 
     Accordingly, a primary object of the present invention is to provide an amphibious vehicle in which the pontoon sections are stored substantially within the vehicle body member thereby causing the vehicle to be compact and maneuverable during transport. 
     The vehicle includes a vehicle body member, a longitudinal upper deck, longitudinally extendable front and rear ramps, and laterally extendable opentop outrigger pontoons on both sides. The outrigger pontoons are pivotable about a longitudinal extending horizontal pivot axis between a retracted transport position in which a major portion of the pontoon is contained within the vehicle body, and a laterally extended position in which the pontoons are positioned substantially externally of the vehicle body member. When the pontoons are in the extended position, the vehicle can displace more water and therefore will have an increased load carrying capacity. The extended pontoons also provide lateral stability when the amphibious vehicle is in the water. By pivoting the pontoons about an axis slightly above the bottom of the vehicle body, any leakage water collected in the bottom may be easily pumped out. The vertical joints between the outrigger pontoon and the vehicle body sidewalls are sealed by a compressible seal which is held in compression between the side wall and the pontoon by locking pins which tighten by rotation on a camway. 
     It is therefore another object of the invention to provide an amphibious vehicle which has an increased load supporting capacity in water relative to its land transport size. 
     It is another object of the invention to provide improved seal means for sealing the joints between the outrigger pontoons and the vehicle body. 
     It is still another object of the invention to provide an amphibious vehicle which possesses excellent structural strength in the bridge forming water condition. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     Other objects and advantages of the invention will become apparent from a study of the following specification when viewed in light of the accompanying drawing, in which: 
     FIG. 1 is a front view of the amphibious vehicle with the pontoons in the laterally-extended bridge-forming condition; 
     FIG. 2 is a front view of the vehicle with the pontoons in the retracted transport condition; 
     FIG. 3 is a side elevational view of the apparatus of FIG. 2; 
     FIG. 4 is a side elevational view of the apparatus of FIG. 1; 
     FIG. 5 is a detailed cross-sectional view taken along line 5--5 of FIG. 3; 
     FIG. 6 is a detailed cross-sectional view taken along line 6--6 of FIG. 4; 
     FIG. 7 is a top view of FIG. 4; 
     FIG. 8 is a cross-sectional view taken along line 8--8 of FIG. 3, with the deck sections removed; 
     FIG. 9 is a detailed cross-sectional view of the vertical sealing means taken along line 9--9 of FIG. 7; 
     FIG. 10 is a detailed view of the cam plate taken along line 10--10 of FIG. 9; 
     FIG. 11 is a cross-sectional view taken along line 11--11 of FIG. 10; 
     FIG. 12 is a detailed side view of the locking pin; 
     FIG. 13 is a cross-sectional view of the locking pin taken along line 13--13 of FIG. 12; and 
     FIG. 14 is a detailed view of the slidable stringer. 
    
    
     DETAILED DESCRIPTION 
     Referring first to FIGS. 1 and 2, the amphibious vehicle includes a vehicle body member 2 having a horizontal bottom wall 2a, a pair of generally vertical front and rear end walls 2b, and a pair of generally vertical side walls 2c. As shown in FIGS. 3 and 4, side walls 2c contain an opening defined by a generally horizontal bottom edge 3 and a pair of vertical edges 4. A pair of outrigger pontoons 6 are pivotally connected with the bottom edge 3 of the opening by a longitudinally extending hinge 8, said pontoons being movable between an initial laterally extended condition (as shown in FIGS. 1 and 4), and a retracted transport condition (illustrated in FIGS. 2 and 3). As shown in FIG. 1, the pontoons, when in the laterally extended position, include a generally rectangular bottom portion 6a which is pivotally connected with the side wall 2c by hinge 8, a side portion 6b, and a pair of front and rear end portions 6c. Hydraulic cylinders 10 are provided for pivoting the pontoon between the extended and retracted positions. The vehicle body member 2 is provided with a plurality of wheels 11 which are retracted into the vehicle body member during nautical use. Propulsion in the water may be provided by conventional means such as propellars or water jets, strategically located as indicated for example at ports 9--9 in FIGS. 1, 2 and 3. 
     As shown in FIGS. 5 and 6, a rubber sealing strip 12 is secured to the body member sidewall 2c and the pontoon bottom portion 6a by a plurality of fasteners 14. Water pressure compresses the seal against the hinge 8 and seals the joint between the sidewall 2c and the bottom portion 6a, thereby preventing water from entering the vehicle body member. 
     As shown in FIG. 9, a compressible sealing strip 16 is located between the body member sidewall 2c and the pontoon end portion 6c. The pins 18 pass through a vertical flange 20 on the sidewall 2c, the sealing strip 16, the end portion 6c, and a cam plate 22, respectively. The cam plate is secured to the inner surface of the end portion 6c. The pins 18 include a tubular shaft portion 18a, a hexagonal head portion 18b, and a triangular shaped locking portion 18c. The cam plate 22 includes a base portion 22a, a pair of inclined camway surfaces 22b, a pair of rotation stops 22c and an opening 22d. In operation, the locking portion 18c of the locking pin 18 is inserted through a hole in the verticle flange 20, through the opening 22d in the base plate, and rotated through an angle of about 90° as indicated in FIG. 10. Rotation of the locking portion 18c on the camway surfaces 22 b causes the body member vertical flange portion 20, and the pontoon end portion 6c to move toward each other thereby compressing the sealing strip and effecting a waterproof seal. 
     Observation windows 17 and 19 are provided to allow viewing from the main control cabin hatch 21. Auxiliary control positions 23 are located in each of the pontoons 6. 
     The upper surface of the body member is provided with deck sections 24a, 24b, and 24c which support heavy traffic loads during use. The deck is preferably made from a dimpled sheathing material, such as U.S. Army Expedient Runway Surface &#34;Mo-Mat&#34; which may be provided with a gritty upper surface for better wear and traction. Filler panels 25 provide footways and support light narrow traffic loads. Ramps 26 pivot about hinges 28 to increase the overall length of the amphibious vehicle. 
     The deck sections are supported by a plurality of longitudinally arranged support stringers 50 which are provided with slots through which the pontoon end walls 6c pass in the retracted transport position. The support stringers 50 are provided with slidable inner stringers 52, FIG. 14, which are slid across the gap by a hydraulic cylinder 54. After the slidable inner stringer is across the gap, a plurality of anchors 56 are inserted into the anchor holes 58 to rigidly connect the stringer sections 50. The stringers, when rigidly connected, provide structural support for the vehicle when the pontoons are in the laterally extended position.