A V-band clamp includes first and second clamp sections each having an arcuate shape with a first end, a second end, and inside surface defining a recessed channel. A hinge pivotably connects the second end of the first clamp section to the first end of the second clamp section. At least one fastener is configured to releasably connect the first end of the first clamp section to the second end of the second clamp section in a closed position. When the V-band clamp is in the closed position, each fastener extends through an opening in an end face on the first end of the first clamp section and into a bore in an end face on the second end of the second clamp section.

TECHNICAL FIELD

The present disclosure relates generally to clamping assemblies and more specifically to a V-band clamp suitable for use on an underwater vehicle.

BACKGROUND

A clamp can be used to secure cylindrical connections in vacuum system components and other joints that require an air-tight or water-tight seal. For example, adjacent sections of a vacuum tube each have an annular flange that can be drawn against the flange on the other component. A clamp can be installed around the abutted flanges to hold them together with the flanges received in a slot defined in sections of the clamp. Such clamps may have two curved sections that are fastened together on one side and include a toggle fastener between the clamp sections on the opposite side. The toggle fastener may be a bolt that can be pivoted so that the head of the bolt engages a catch on one of the clamp sections. Tightening the bolt against the catch tightens the clamp around the flanges and draws together the flange faces.

The figures depict various embodiments of the present disclosure for purposes of illustration only. Numerous variations, configurations, and other embodiments will be apparent from the following detailed discussion.

DETAILED DESCRIPTION

In accordance with an embodiment of the present disclosure, a V-band clamp is configured to be installed on a joint between adjacent portions of an underwater vehicle. In one example, the clamp includes a plurality of arcuate sections that are hinged together in a single assembly. Open ends of the V-band clamp can be secured together to form a closed band around a cylindrical joint. In one example, the V-band clamp includes two semicircular sections of approximately equal circumferential length. A hinge connects adjacent ends of the clamp sections and allows the sections to be pivoted between open and closed positions. Inside faces of the clamp sections define a channel that is configured to receive flanges or interfaces on adjacent sections of an underwater vehicle. When the V-band clamp is installed on the joint, one or more fasteners extending in a tangential direction can be used to secure the clamp in a closed position. For example, fasteners extend between free ends of the V-band clamp, and when tightened, draw the clamp sections together in a closed shape around the joint.

In accordance with some embodiments, each fastener can be installed in a pocket hole that extends through an end face of one clamp section and into an opening in the end face of the other clamp section. In some such embodiments, the fasteners are retained in the pocket hole by way of a threaded end that is larger than the smooth fastener shaft. When the fasteners are tightened to secure the clamp in the closed position, the fastener head is received in the pocket hole. Accordingly, the fastener does not protrude beyond the outside surface of the clamp. The hinge between sections of the V-band clamp can be made flush with inside, outside, and/or lateral faces of the V-band clamp.

The V-band clamp according to the present disclosure can be configured for installation on a cylindrical joint or a joint having an oval or other rounded cross-sectional shape. When installed on an underwater vehicle, for example, the outside surface of the clamp, including fasteners and hinges, can be made flush or recessed with respect to the outside surfaces of the adjacent sections being joined. Accordingly, the V-band clamp can reduce frictional drag on the underwater vehicle compared to existing designs. As will be appreciated in light of this disclosure, reference herein to an underwater vehicle refers to a vehicle configured for underwater travel. The vehicle may be manned or unmanned, and may be, for instance, a submarine or exploratory vehicle, or a guided or unguided projectile. To this end, the vehicle may include a payload that is non-lethal (e.g., imaging gear, data collection gear, supplies, etc.) or lethal (e.g., explosives, etc.). Numerous variations and embodiments will be apparent in light of the present disclosure.

General Overview

Existing V-band clamps used for vacuum connections, automotive applications and other uses include hardware and hinge assemblies that protrude radially beyond the outside surface of the clamp. When used on a vacuum hose connection in a laboratory setting or on an exhaust pipe connection, such a design may be acceptable to facilitate use of tools and access to the clamp. However, when clamp is used to secure sections of an underwater vehicle, for example, protruding fasteners and hinges increase the aerodynamic drag on the vehicle. Shaft collars have been designed with two separate semicircular portions that can be fastened together with machine screws extending between ends of each section, reducing the overall size of the collar. However, existing shaft collars include multiple individual components that easily separate from one another when the collar is not installed, such as an assembly including separate collar sections and loose fasteners. The separate components of such a collar complicate assembling the collar to its intended location, particularly when installed underwater or in an environment with little free space. When existing clamps are used to join sections of an underwater vehicle, protruding fasteners and protruding hinges increase the aerodynamic drag as the vehicle moves through water. Clamps involving individual components complicate installation, especially in an underwater environment. For example, more than one person may be required to place and hold together clamp sections, place and hold together vehicle sections, and install multiple fasteners into the clamp at the same time, all while working underwater.

The present disclosure addresses these and other challenges by providing a V-band clamp configured for use on an underwater vehicle. In one example, a rigid hinge between semicircular clamp sections enables movement of the clamp between open and closed positions while maintaining proper alignment of the sections. As a result, fasteners are aligned with fastener openings when the clamp is moved to the closed position. A V-band clamp with such a hinge also reduces the number of fasteners needed to secure the clamp in a closed position and simplifies handling the clamp since it is a single assembly.

In some embodiments, screws in the first end of one clamp section can be retained captive in pocket holes so they are ready to engage fastener openings in the end of the other open end of the clamp. Captive fasteners simplify handling required to start a fastener as well as reduce or eliminate the chance of dropped or lost fasteners. In one example, each captive fastener can have a threaded end portion of the shaft that prevents the fastener from escaping the pocket opening and separating from the clamp section.

Additional embodiments and advantages will be apparent in light of the present disclosure.

Example Embodiments

FIG.1illustrates a perspective view of a V-band clamp100in a closed position with some components of a hinge150shown disassembled from the band, in accordance with an embodiment of the present disclosure. The V-band clamp100includes a first clamp section110and a second clamp section120connected to one another by a hinge150. In this embodiment, the hinge150connects the second end110bof the first clamp section110to the first end120aof the second clamp section120so that the clamp sections110,120can pivot about the hinge150with respect to one another and with respect to a central axis10through the V-band clamp100. In the closed position, such as shown inFIG.1, the V-band clamp100substantially defines a closed circle or hoop of rounded shape that is continuous except for a small circumferential gap166between adjacent ends of the first and second clamp sections110,120.

In the example ofFIG.1the V-band clamp100includes two clamp sections110,120. In other embodiments, the V-band clamp100can have three, four or other number of clamp sections that include a first clamp section and a last clamp section linked or otherwise connected together. In such embodiments, the first end of one clamp section is movably joined (e.g., by a hinge) to the second end of an adjacent clamp section to permit converting the V-band clamp100between open and closed positions and facilitate installation on and removal from a joint. The V-band clamp100of the present disclosure is not limited to a circular geometry when closed, and similarly can be configured to be installed on a joint of oval, elliptical, or other rounded geometry, as will be appreciated.

The first end110aof the first clamp section110and the second end120bof the second clamp section120(or last clamp section) are releasably connected by one or more fasteners160. In this example, the first clamp section110and second clamp section120each have a semicircular geometry, accounting for intentional or unintentional gaps between adjacent first end110aand second end120bwhen closed. Example fasteners160are discussed in more detail below.

The hinge150includes hinge plates152positioned along and secured to opposite lateral sides of the first and second clamp sections110,120. The hinge plates152are positioned and dimensioned to approximate a continuous band of consistent axial width and consistent radial thickness at the location of the hinge plates152. In combination with a relatively small circumferential gap158between first and second clamp sections110,120, hinge plates152enable the V-band clamp100to apply continuous pressure to a joint along all or substantially all of the circumferential length of the V-band clamp100. This in turn reduces leaks in the joint.

Each hinge plate152can be fixedly attached with fasteners154(e.g., with recessed machine screws) to the second end110bof the first clamp section110, and pivotably secured with a hinge pin156(e.g., a dowel pin or screw) to the first end120aof the second clamp section120, or vice versa. As such, the second clamp section120can pivot between open and closed positions of the V-band clamp100yet can rigidly secure a joint due to the fixed connection with part of each hinge plate152. In other embodiments, each hinge plate152is pivotably attached to both the second end110bof the first clamp section110and the first end120aof the second clamp section120(or adjacent ends of other clamp sections as the case may be). Other types of attachment methods can be used between hinge plates152and clamp sections110,120, whether fixed or movable, and including welding, machine screws, rivets, and pins.

In this example, adjacent ends of the first and second clamp sections110,120are retained in close proximity by the hinge plates152. A small circumferential gap158between the second end110bof the first clamp section and first end120aof the second clamp section120is bridged by the hinge plates152extending along lateral faces102. By bridging the circumferential gap158, the V-band clamp100can maintain contact with a joint surface along the entire location of the hinge150.

The lateral faces102of the first and second clamp sections110,120define a recess103to accommodate the hinge plates152. Accordingly, the hinge plates152can be substantially flush with the lateral faces102of the clamp sections110,120so as to provide generally continuous lateral faces102around the circumference of the V-band clamp100. Hinge plates152also can be dimensioned consistently with the lateral faces102of the V-band clamp100so that the hinge plates152are flush with substantially flush with the inside face106and/or the outside face104of the V-band clamp100. For example, surfaces of the hinge plates152and corresponding faces102,104,106of the clamp sections110,120are within ±2 mm, within ±1 mm, within ±0.2 mm, or within ±0.1 mm. As a result, the hinge150of the V-band clamp100simulates a continuous inside face106, outside face104, and lateral faces102. Additionally, with minimal or no protrusion from components of the hinge150, the V-band clamp100as a whole can be substantially flush with or recessed with respect to the outer surfaces of adjacent sections of a joint when installed, depending on the overall diameter of the V-band clamp100and required tolerances.

In other embodiments, the hinge plate152can be integral to the first clamp section110or can be omitted altogether. For example, the hinge150can employ overlapping portions of the first and second clamp sections110,120that can be pivotably connected with hinge pins156on opposite lateral sides of the hinge150or by a single hinge pin156extending axially through both sides of the hinge150. In yet other embodiments, the hinge150is or includes a deformable linkage, a region of reduced thickness along a single continuous band or clamp section, or a structure that otherwise permits moving the clamp sections110,120between open and closed positions. Numerous embodiments and variations will be apparent in light of the present disclosure.

In the example shown inFIG.1, the first end110aof the first clamp section110and the second end120bof the second clamp section120can be releasably connected and tightened together using fasteners160oriented generally in a circumferential or tangential direction. In this example, two fasteners160are shown, but a single fastener160or more than two fasteners160can be used as needed for a particular application or a particular lateral width of the V-band clamp100, as will be appreciated. Each fastener160is installed through pocket holes162in the first clamp section110so that the fasteners160engage fastener openings114extending into the end face126of the second end120bof the second clamp section120, or vice versa. Fasteners160are discussed in more detail below.

FIG.2shows a cross-sectional view showing part of a V-band clamp100, in accordance with an embodiment of the present disclosure. As noted above, the V-band clamp100has a hoop shape in its closed configuration, in accordance with some embodiments. The outside face104has a linear profile and the inside face106defines a channel108positioned between opposite lateral faces102. In some embodiments, the channel108is centered between the opposite lateral faces102, but this is not required in all embodiments. Sides108aof the channel108define an obtuse angle α with the inside face106between the sides108a. In some embodiments, the angle α is from 100-130°, including 105-115°, 110-120°, 115-130°, 110°, and 120°.

The V-band clamp100optionally defines a plurality of fastener openings109extending in a radial direction part way through (e.g., a blind bore) or completely through the V-band clamp100(e.g., a through bore). Fastener openings109are defined in lateral portions105of the clamp between the channel108and the lateral face102where the clamp sections have an increased radial thickness. The fastener openings109can be used for mounting accessories to the V-band clamp100. In some such embodiments, the fastener openings109are threaded along all or part of the fastener opening109. In some embodiments, each fastener opening109can be a combination of concentric bores of different diameters, such as to accommodate threaded and smooth portions of the fastener opening109. In one embodiment, fastener openings109are distributed around the circumference of the V-band clamp100with consistent or inconsistent spacing. For example, fastener openings109are spaced every 15-60°, such as every 20°, every 30°, or every 45°. In other embodiments, fastener openings109are positioned only along part of the circumference, may have an irregular circumferential spacing, or may define a hole pattern specific to a particular component to be mounted to the V-band clamp100, for example. Numerous variations and embodiments will be apparent in light of the present disclosure.

In some embodiments, the V-band clamp has an overall radial thickness T1of 8-12 mm, such as about 10 mm, and a channel thickness T2in the channel108from 2-8 mm, such as 3-5 mm, or about 4 mm. The overall lateral width W1is from 40-60 mm, including 45-55 mm, and about 50 mm. The channel108has a channel width W2(measured along the inside face106) that is 40-60% of the overall lateral width W1, including 45-55%, or about 50% of the overall lateral width W1. In one example, the overall lateral width W1is about 50 mm, the channel width W2is about 22 mm, the overall thickness T1is about 10 mm, the channel thickness T2is about 3.8 mm, and angle α is about 110°. Fastener openings109have a diameter from 2-6 mm, such as about 5 mm. When made of anodized aluminum, titanium, stainless steel or similarly rigid materials, some such embodiments of the V-band clamp100have sufficient structural rigidity to securely clamp adjacent sections of an underwater vehicle with a water-tight seal.

FIG.3is a perspective view of the V-band clamp100ofFIG.1shown in an open position, in accordance with an embodiment of the present disclosure. Here, the fasteners160have been disengaged from fastener openings114in the end face126of the second clamp section120, allowing the first clamp section110to pivot about hinge150with respect to the second clamp section120. Optionally, fasteners160are retained in a position so that ends of fasteners160protrude through the end face116of the first clamp section110, ready to engage the fastener openings114in the second clamp section120(or last clamp section) when the V-band clamp is returned to a closed position.

FIG.4illustrates a cross-sectional view showing the first end110aof the first clamp section110and the second end120bof a second clamp section120(or last clamp section) of a V-band clamp100, in accordance with an embodiment of the present disclosure. InFIG.4, the section is taken through a fastener160and the corresponding pocket hole162and fastener opening114. Each fastener160extends through a first fastener opening115in the first end110aof the first clamp section110and into a second fastener opening114in the second end120bof the last clamp section (e.g., second clamp section120). Due to the increased thickness at lateral portions105, fastener openings114,115can be defined through lateral portions105of the clamp sections110,120. The fastener head161is larger than the fastener's smooth shaft portion160band occupies a pocket hole162that is continuous with the first fastener opening115. Note that first fastener opening115includes a larger first portion115aand a smaller second portion115b, where the smaller second portion115bis between the larger first portion115aand the pocket hole162. The pocket hole162, first fastener opening115, and second fastener opening114are coaxially arranged along a bore axis170that is normal to the end faces116,126.

In this example, first fastener opening115includes a first portion115aof a first diameter and a second portion115bof a smaller second diameter, where the second portion115bis between the pocket hole162and the first portion115a. The first portion115ais sized to clear the threads on the threaded portion160aof the fastener160and to allow free axial movement of the threaded portion160a. The second portion115bis sized to clear the smooth shaft portion160bof the fastener160and to allow free axial movement of the smooth shaft portion160bbetween the threaded portion160aand the fastener head161. In some such embodiments, the second portion115bis threaded consistent with the threaded portion160aof the fastener160. As such, the threaded portion160aof the fastener160can be advanced through the threaded second portion115bof the first fastener opening115so that the fastener160is retained by the second clamp section120even when the fastener160is not engaged in the second fastener opening114in the second clamp section120, and still allowing the fastener160to be removed from the first clamp section110if desired. Captive fasteners160have the advantage of reducing or eliminating the use of incorrect fasteners and loss of fasteners. Captive fasteners160also facilitates installation of the V-band clamp100by reducing the amount of handling necessary to install a fastener160when the V-band clamp100is in the closed position.

In some embodiments, the V-band clamp100has a circumference that is slightly smaller than the corresponding joint on which it is intended to be installed. For example, the V-band clamp100has a circumference between 99-100% of the corresponding joint circumference. In such an embodiment, the first end110aof the first clamp section110and the second end120bof the second clamp section120(or last clamp section) define a circumferential gap166when the V-band clamp100is tightened around the joint. In one example, the V-band clamp100is configured for installation on a joint between cylindrical sections of an underwater vehicle, where the joint has an outer diameter of about 15 cm, 20 cm, 25 cm, 30 cm, or some other size. In some such embodiments, the circumferential gap166is from 0.5-3 mm when fully tightened around the joint, including 1-2 mm, 1.2-1.8 mm, at least 0.2 mm, at least 0.5 mm, at least 1.0 mm, at least 2 mm, not more than 5 mm, not more than 4 mm, not more than 3 mm, and not more than 2 mm. The circumferential gap166allows the V-band clamp100to be tightened around the joint with the necessary clamping force and without being limited by contact of the first and second clamp sections110,120.

FIG.5illustrates a perspective view showing second end120bof second clamp section120, in accordance with an embodiment of the present disclosure. In this example, fastener openings114extend into end face126in a direction normal to the end face126. Each fastener opening114is defined in a lateral portion105of the second clamp section120between the channel108and the adjacent lateral face102. InFIG.5, fastener openings114are illustrated as being smooth bores, but the fastener openings114are typically threaded along at least a portion of the fastener opening114.

FIG.6illustrates a side view of a fastener160used to connect adjacent clamp sections, in accordance with an embodiment of the present disclosure. The fastener160includes a fastener head161and a threaded portion160aon opposite ends of a smooth shaft portion160b. The fastener head161has a first diameter D1, the smooth shaft portion160bhas a second diameter D2, and the threaded portion160ahas a third diameter D3. In one example, D1is greater than D2and D3is greater than D2, where D3is measured as the outside thread diameter. The threaded portion160ahas a length suitable to extend between and connect the first and second clamp sections110,120, such as described above, with the threaded portion160aengaging the fastener opening114in the second clamp section120. The fastener160can be advanced to tighten the V-band clamp100around a joint on which it is installed, where tightening may include drawing together clamp sections such that the inside face106of V-band clamp100contacts the corresponding outside surface face of the joint along all or substantially all of its circumference. For example, when installed on a cylindrical joint with abutting flanges, the inside face106makes contact with the joint along at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 95%, at least 98%, at least 99% of the circumference of the joint.

FIGS.7-8show an inside face106and an outside face104, respectively, of part of a V-band clamp100along a hinge150between a second end110bof a first clamp section110and a first end120aof a second clamp section, in accordance with an embodiment of the present disclosure. The hinge150includes hinge plates152, fasteners154, and hinge pins156as discussed above. Recesses103in lateral faces102of each clamp section result in a tongue128that has a reduced lateral width compared to the remainder of the first and second clamp sections110,120. Each hinge plate152is received in recesses103on the first and second clamp sections110,120and is secured to the lateral faces102of the tongue128. Each hinge plate152extends to connect the tongue128on the first clamp section110to the tongue128on the second clamp section120. In some embodiments, the overlapping arrangement of tongues128and hinge plates152provides a rigid hinge with little or no torsional movement between the clamp sections110,120. Accordingly, when the V-band clamp100is moved to the closed position, the open ends (e.g., first end110aand second end120b) are properly aligned for relatively quick and easy installation of the fasteners160to retain the V-band clamp100in the closed position.

The lateral width of each tongue128and thickness of each hinge plate152can be selected so that the hinge plates152are flush with the lateral faces102, inside face106, and outside face104of the clamp sections110,120. Each hinge plate152can be curved with a radius of curvature equal to that of the clamp sections110,120. With dimensions and shape appropriately selected, each hinge plate152can approximate a continuous clamp section. In one embodiment, fasteners154, such as machine screws, secure the hinge plate152to the side of one tongue128, while a hinge pin156(e.g., a dowel pin, rivet, screw, etc.) is used to movably secure the hinge plate152to the side of the adjacent tongue128. In the example shown, two machine screws are used to secure each hinge plate152to one tongue128. In other embodiments, a single fastener or a hinge pin156may be used. In its assembled state, tongues128are between hinge plates152, and each hinge plate152is flush with lateral faces102of the clamp sections110,120.

Referring now toFIGS.9-10, perspective views show a closure200as part of a V-band clamp100, in accordance with an embodiment of the present disclosure.FIG.9shows a partially exploded perspective view of a V-band clamp100with a plurality of clamp sections and closure200. In this example, the V-band clamp100includes a first clamp section110, a second clamp section120, and a third clamp section130. In other embodiments, more or fewer clamp sections can be used, as will be appreciated. In some embodiments, the materials used to make the V-band clamp100may be sufficiently resilient to enable a single clamp section to be used (e.g., a band of metal or a polymer composite), where the clamp section can be opened to the extent necessary to install on a cylindrical joint. In other embodiments, the V-band clamp100includes, 2, 3, 4, or other number of clamp sections. Metals (e.g., aluminum, titanium, and stainless steel) can be used for various portions of the V-band clamp100to provide a rigid assembly, as desired.

In the example ofFIG.9, the first clamp section110is pivotably connected to the second clamp section120by a hinge150and the second clamp section120is pivotably connected to the third clamp section130by a hinge150. The first clamp section110and the third clamp section130are releasably connected by the closure200. Each hinge150includes hinge plates152connected to opposite lateral faces102of a tongue128defined in the end portion of the respective clamp section. Fasteners154extend through the hinge plate152and into the tongue128to pivotably connect the hinge plate152to the tongue128. Optionally, a washer or bushing (not shown) may be used to facilitate movement between the clamp section and the hinge150, although such components are not required.

Optionally, the V-band clamp100defines one or more recesses220in an inside face106of a clamp section, such as along lateral portions105. Recesses220can be used to correctly orient the V-band clamp100on the joint. For example, recesses220on one side of the clamp section have a rectangular geometry while recesses220on the opposite side of the clamp section have a rounded geometry. When the V-band clamp100is installed on a joint with corresponding protrusions of a mating shape, the recesses220can be seated on the protrusions when the V-band clamp100is properly positioned.

In more detail, and with continued reference toFIG.9,FIG.10illustrates a close-up perspective view of closure200as seen from an opposite side. The closure200includes a clasp202that is pivotably mounted to the tongue128of the third clamp section130using fasteners154extending axially into opposite sides of the tongue128. For example, the clasp202includes side plates203that are similar in size and shape to the hinge plates152used in the hinge150, in accordance with some embodiments. Arms204are pivotably mounted to the clasp202and include a hook206configured to engage a pin208or catch extending laterally outward from the tongue128of the first clamp section110. Optionally, a clasp pin210extends between and connects the arms204so that they pivot as a single unit when the clasp202is operated between open and closed positions. In use, the clasp202can be pivoted away from the V-band clamp100(e.g., upward and away from third clamp section130) so that the hooks206can engage the pins208. After the hooks206are positioned on the pins208, the clasp202can then be folded down against the third clamp section130to tighten the closure200. In doing so, the lever action of the clasp202causes the arms204to draw the first clamp section110towards the third clamp section130and tighten the V-band clamp100by reducing the circumferential length of the V-band clamp100. When the V-band clamp100is installed on a joint, this tightening action secures the V-band clamp100around the joint and retains the joint in a closed position.

FIGS.11A and11Billustrate cross-sectional views of part of a joint240between first and second sections301,302of an unmanned underwater vehicle (UUV)300with V-band clamp100installed, in accordance with an embodiment of the present disclosure. InFIG.11A, the joint240includes first and second interfaces242,244, components that are separate from but secured to respective first and second sections301,302of the UUV300. InFIG.11B, the first and second interfaces242,244are integral to the respective first and second sections301,302of the UUV300. In either case, the V-band clamp100performs the same function of securing and drawing together the interfaces242,244. Accordingly,FIGS.11A-11Bare discussed concurrently below.

The first interface242includes a tongue portion242aand body portion242bthat defines a recess242cconfigured to receive the corresponding tongue portion244aof the second interface244. Similarly, the second interface244includes a tongue portion244aand a body portion244bdefining a recess244cconfigured to receive the corresponding tongue portion242aof the first interface242. In the assembled condition, the tongue portions242a,244aoverlap. The tongue portion242aof the first interface242extends to be in close proximity with the body portion244bof the second interface244. Similarly, the tongue portion244aof the second interface244extends to be in close proximity with the body portion242bof the first interface242. Optionally, one or more O-rings245or gaskets can be positioned between the interfaces242,244, such as between tongue portion242aof first interface242and body portion244bof second interface244.

Each interface242,244further defines a channel246to receive a lateral portion105of the V-band clamp100. In one embodiment, inner faces105aof the lateral portions105are sloped to engage corresponding sloped faces on the interfaces242,244. As such, when the V-band clamp100is tightened around the joint240, the inner faces105aon the lateral portions105of the V-band clamp100cam the interfaces242,244axially towards each other. In doing so, a seal can be formed between the V-band clamp100and the interfaces242,244and/or between the interfaces242,244. When an O-ring245is present, the O-ring245can be compressed to form a water-tight seal between interfaces242,244. In some embodiments, as the V-band clamp100is tightened around the joint240, the first section301and second section302of the UUV are drawn together to form a water-tight seal, where a reduction in the circumference of the V-band clamp100translates to axial force to tightly draw together adjacent sections of the UUV300.

In other embodiments, the joint240can employ a tongue-and-groove interface, abutting surfaces, a sealing taper, a gasket seal, a plurality of O-rings245, or other suitable configuration or combination of features to form a water-tight seal between interfaces242,244, and therefore between first section301and second section302of the UUV300.

As can be seen in the examples of11A and11B, the V-band clamp100and joint240can be sized and configured so that the outside face104of the V-band clamp100is flush with, substantially flush with, or recessed compared to the outside surface301aof the first section301and the outside surface302aof the second section302of the UUV. For example, for a V-band clamp100having a diameter of 30 cm, the outside face104does not protrude radially beyond the outside surface301aof the first or the outside surface302aof the second section302, and when recessed is recessed not more than 5 mm, not more than 3 mm, not more than 2 mm, or not more than 1 mm relative to the outside surfaces301a,302a. Accordingly, the V-band clamp100results in little or no additional drag on the UUV300compared to an otherwise continuous outer cylindrical surface of the UUV300.

FIG.12illustrates a side view of a UUV300with a first section301(e.g., a nose section or front section), a second section302(e.g., a body section), and a third section303(e.g., a tail section or propulsion section), in accordance with an embodiment of the present disclosure. The UUV300has a first V-band clamp100abetween the first section301and the second section302, and a second V-band clamp100bbetween the second section302and the third section303.

FIG.13Aillustrates a perspective view showing a front part300aof the UUV300ofFIG.12in a disassembled state, in accordance with an embodiment of the present disclosure. The first section301is disassembled from the second section302and from first V-band clamp100a. The first section301includes an integral first interface242configured to mate with the second interface244on the distal end of the second section302. In this example, the first interface242includes a circumferential protrusion248adjacent a lip249. When assembled, the second interface244on the distal end of the second section302overlaps the lip249so that a circumferential protrusion250on the second interface244abuts or is adjacent the circumferential protrusion248on the first interface242to form a water-tight seal. For example, the second interface244and lip249have a sealing taper. When assembled, the circumferential protrusions248,250can then be received in the channel108defined in the first V-band clamp100a.

FIG.13Billustrates a perspective view showing a rear part300bof the UUV300ofFIG.12in a disassembled state, in accordance with an embodiment of the present disclosure. The rear portion includes the second section302, second V-band clamp100b, third section303, and accessory320configured to be mounted to the second V-band clamp100b. Similar to the front part300a, the proximal end of the second section302includes an integral first interface242configured to mate with the second interface244on the distal end of the second section302. In this example, the first interface242includes a circumferential protrusion248adjacent a lip249. When assembled, the second interface244on the third section303overlaps the lip249so that a circumferential protrusion250on the second interface244abuts or is adjacent the circumferential protrusion248on the first interface242to form a water-tight seal. For example, the second interface244and lip249have a sealing taper. The circumferential protrusions248,250can then be received in the channel108defined in the second V-band clamp100b. Tightening the second V-band clamp100baxially draws together the first and second interfaces242,244and retains the second section302coupled to the third section303.

The accessory320can be a sonar device, a temperature sensor, a camera, a lifting handle, a tow hook, or other accessory that facilitates unmanned underwater activity, for example. In this example, the accessory320includes a mounting plate324with holes arranged to align with fastener openings109on the second V-band clamp100b. Fasteners322can be installed through the mounting plate324and into the fastener openings109to secure the accessory320to the second V-band clamp100b. One or more accessories320can be mounted to the either or both of the first and second V-band clamps100a,100b.

V-band clamp100as variously described herein can be made of anodized aluminum, titanium, stainless steel, a reinforced polymer composite, or any other suitable material. In some embodiments, V-band clamp100can be made of rigid materials, such as metal, to facilitate camming action of the interfaces242,244of a joint240. In other embodiments, V-band clamp100can be made of flexible materials that are inelastic or of limited elasticity, such as a polymer composite, such that the V-band clamp100maintains sufficient sealing pressure on the joint240when tightened.

In use, some embodiments of the V-band clamp100as variously described in the present disclosure advantageously feature clamp sections110,120, a hinge150, and captive fasteners160in a single assembly of attached parts. As such, installation of the V-band clamp can be simplified by avoiding loose fasteners and unattached clamp sections. For example, the V-band clamp100can be handled as a single component that allows simplified opening, closing, installing, and tightening. Additionally, some embodiments of the V-band clamp100are particularly suited for use on an underwater vehicle due to having low aerodynamic drag when installed on the joint between vehicle sections. The materials and dimensions of the V-band clamp100can be selected to provide for a rigid structure that securely retains together joint components in a water-tight seal. Further, by avoiding protruding hinge or fasteners, the installed V-band clamp100can be flush with the outside surface of the underwater vehicle. Numerous variations and embodiments will be apparent in light of the present disclosure.

FURTHER EXAMPLE EMBODIMENTS

Example 1 is a V-band clamp comprising a first clamp section and a second clamp section, the first and second clamp sections each having an arcuate shape with a first end and a second end, and having an inside surface defining a recessed channel; a hinge pivotably connecting the second end of the first clamp section to the first end of the second clamp section; and at least one fastener configured to releasably connect the first end of the first clamp section to the second end of the second clamp section in a closed position, wherein when in the closed position the at least one fastener extends through an opening in an end face on the first end of the first clamp section and into a bore in an end face on the second end of the second clamp section.

Example 2 includes the subject matter of Example 1, wherein the at least one fastener includes a threaded end portion and wherein the bore in the end face on the second end of the second clamp section is a threaded bore configured to engage the threaded end portion of the at least one fastener.

Example 3 includes the subject matter of Examples 1 or 2, wherein the hinge includes hinge plates extending in a circumferentially direction between and connecting the first and second clamp sections, each hinge plate connected to the second end of the first clamp section and to the first end of the second clamp section, and each hinge plate being substantially flush with side faces of the first and second clamp sections.

Example 4 includes the subject matter of Example 3, wherein a first end of each hinge plate is fixedly secured to one of the first clamp section or the second clamp section, and wherein a second end of each hinge plate is pivotably secured to the other of the first clamp section or the second clamp section.

Example 5 includes the subject matter of Example 3 or 4, wherein each hinge plate is substantially flush with side faces, inside faces, and outside faces of the first and second clamp section.

Example 6 includes the subject matter of any of Examples 1-5, wherein each at least one fastener is captive to the first clamp section.

Example 7 includes the subject matter of Example 6, wherein each at least one fastener is partially retained in a pocket hole in the first clamp section.

Example 8 includes the subject matter of any of Examples 1-7, wherein in the closed position, the V-band clamp defines a circumferential gap between the first end of the first clamp section and the second end of the second clamp section.

Example 9 includes the subject matter of any of Examples 1-8, wherein at least one of the first and second clamp sections defines bores extending in a radial direction.

Example 10 includes the subject matter of Example 9, wherein the bores are threaded bores.

Example 11 is a V-band clamp comprising a plurality of arcuate clamp sections each having a first end portion and a second end portion, wherein the plurality of arcuate clamp sections are movably linked together from a first clamp section to a last clamp section such that the second end portion of one the plurality of arcuate clamp sections is adjacent the first end portion of an adjacent one of the plurality of arcuate clamp sections, and wherein the plurality of arcuate clamp sections defines a continuous channel along an entire inside surface of the V-band clamp; and a fastener configured to releasably connect the first end portion of the first clamp section to the second end portion of the last clamp section, the fastener including a head portion of a first diameter, a shaft portion of a smaller second diameter, and a threaded portion on an end of the shaft portion and having a third diameter greater than the second diameter; wherein the first end portion of the first clamp section defines a pocket hole through an end face of the first end portion, the pocket hole having a first bore sized and configured to accept the head portion and a threaded through-bore configured to engage threads of the threaded portion of the fastener; and wherein the second end portion of the last clamp section has an end face defining a threaded bore extending into the end face, the threaded bore configured to engage the threaded portion of the fastener.

Example 12 includes the subject matter of Example 11, wherein the plurality of arcuate clamp sections substantially defines a closed circular shape when the fastener connects the first end of the first clamp section to the second end of the last clamp section.

Example 13 includes the subject matter of Examples 11 or 12, wherein each of the plurality of arcuate clamp sections defines part of a circle.

Example 14 includes the subject matter of any of Examples 11-13, wherein the head portion of the fastener is within the pocket hole when the fastener connects the first clamp section to the last clamp section.

Example 15 includes the subject matter of any of Examples 11-14, wherein the plurality of arcuate clamp sections includes only the first clamp section and the last clamp section, the first clamp section and the last clamp section each having a semicircular shape.

Example 16 includes the subject matter of Example 15 and further comprises a hinge connecting the second end of the first clamp section to the first end of the second clamp section.

Example 17 is an underwater vehicle comprising a first vehicle section, a second vehicle section abutting the first vehicle section to define a joint, and the V-band clamp of any of Examples 1-16 in the closed position around the joint.

Example 18 includes the subject matter of Example 17, wherein the underwater vehicle includes a first vehicle section and a second vehicle section joined in abutment with the V-band clamp, wherein an outside surface of the V-band clamp is flush with an outside surface of the underwater vehicle.

Example 19 includes the subject matter of Example 17 or 18, wherein the underwater vehicle has a cylindrical shape with a diameter from 6 cm to 35 cm.

Example 20 includes the subject matter of Example 19, wherein the diameter is from 10 cm to 30 cm.

Example 21 is an underwater vehicle comprising a first vehicle section with a first outside surface and a first flange on a cylindrical first end, the first flange having a first radially outer face that is recessed with respect to the first outside surface of the first vehicle section; a second vehicle section with a second outside surface and a second flange on a cylindrical second end, the second flange having a second radially outer face that is recessed with respect to the second outside surface of the second vehicle section; and a V-band clamp including a first clamp section hingedly connected to a second clamp section, the V-band clamp configured to extend around the first flange and the second flange in a closed configuration in which the first radially outer face and the second radially outer face are received in a channel defined along an inside of the V-band clamp; wherein in an installed condition, an entirety of the v-band clamp is flush with or recessed with respect to the first outside surface and the second outside surface.

Example 22 includes the subject matter of Example 21, wherein the V-band clamp defines threaded openings extending radially into at least one of the first clamp section and the second clamp section.

Example 23 includes the subject matter of Examples 21 or 22, wherein in the installed condition, the V-band clamp defines a circumferential gap between the first end of the first clamp section and the second end of the second clamp section.

Example 24 includes the subject matter of any of Examples 21-23 and further comprises a fastener extending between and connecting the first end of the first clamp section to the second end of the second clamp section when the V-band clamp is in the closed configuration.