Abstract:
A clamp secures objects against a structure adjacent to and on either sidef a rib of the structure. First and second arms are pivotally coupled to one another at a pivot point. The arms define a pair of opposing jaws that engage the rib and a pair of levers extending away from the opposing jaws on either side of the rib. A threaded member cooperating with each lever is rotated towards the structure. An object is positioned between each threaded member and the structure. In this way, the threaded members press the objects securely against the structure as the opposing jaws grip the rib.

Description:
STATEMENT OF GOVERNMENT INTEREST 
     The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefore. 
    
    
     BACKGROUND OF THE INVENTION 
     (1) Field of the Invention 
     The present invention relates generally to clamps, and more particularly to a clamp that attaches to a structure&#39;s rib while simultaneously securing one or more objects against the structure adjacent the rib. 
     (2) Description of the Prior Art 
     Many wall structures incorporate ribs to increase the strength thereof. When it is necessary to secure an object to such a wall structure, it is desirable to maintain the integrity of all ribs. Thus, any means of securing objects to a ribbed wall structure should not require any modifications, e.g., drill holes, cuts, etc., to any rib. In addition, if the object must be easily removed at a later time, the means of securing the object should not involve a bonding material, e.g., glue, epoxy, solder, etc. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide an apparatus that secures an object to a ribbed wall structure without requiring any modification of the ribbed wall structure. 
     Another object of the present invention is to provide an apparatus that secures an object to a ribbed wall structure while also allowing the object to be easily removed. 
     Still another object of the present invention is to provide a clamp capable of clamping to the rib of a ribbed wall structure without requiring any modification of the rib. 
     Other objects and advantages of the present invention will become more obvious hereinafter in the specification and drawings. 
     In accordance with the present invention, a clamp is provided that secures objects against a structure adjacent to and on either side of a rib of the structure. First and second arms are pivotally coupled to one another at a pivot point to define a pair of opposing jaws for engaging the rib and a pair of levers extending away from the opposing jaws on either side of the rib. A plurality of threaded members are in threaded engagement with the levers. At least one threaded member cooperates with each lever such that, when rotated towards the structure with one of the objects positioned between the threaded member and the structure, presses the object securely against the structure as the opposing jaws grip the rib. The clamp can be also used to securely grip the rib even when no objects are being secured to the structure. The clamp can be easily modified to secure a plurality of objects on either side of the rib. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A more complete understanding of the invention and many of the attendant advantages thereto will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein corresponding reference characters indicate corresponding parts throughout the several views of the drawings and wherein: 
     FIG. 1A is a side view of one embodiment of the rib clamp of the present invention prior to being clamped onto a rib of a structure on which objects positioned on either side of the rib are to be secured; 
     FIG. 1B is a side view of the rib clamp after it has engaged the rib and secured the objects to the structure; 
     FIG. 2 is an alternative embodiment of the rib clamp with its jaws modified to cooperate with a rib that is shaped like an I-beam; and 
     FIG. 3 is another alternative embodiment of the rib clamp in which a plurality of objects can be secured on either side of the rib. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring now to the drawings, and more particularly to FIGS. 1A and 1B, one embodiment of a rib clamp 10 according to the present invention is shown just prior to being clamped onto a rib 100 (FIG. 1A) and after being clamped onto rib 100 (FIG. 1B). By way of example, rib 100 is integral with a base (wall) structure 102, both of which are shown in cross section. In its preferred application, clamp 10 is used to easily secure objects 110 and 112 to base structure 102 without the use of any bonding adhesives. As illustrated, the two objects 110 and 112 are located on either side of rib 100. However, as will be apparent to one of ordinary skill in the art, clamp 10 can be used when only one object needs to be secured or when no objects need to be secured. In addition, as will be explained further below, clamp 10 can be modified to secure more than two objects to base structure 102. 
     Clamp 10 includes lever arms 12 and 14 pivotally coupled to one another by a pin 16 at a pivot point 18. Lever arms 12 and 14 are L-shaped at respective ends 12A and 14A to define opposing jaws that will be used to engage either side of rib 100. Each respective jaw face 22 and 24 can be provided with means to enhance the gripping action between each jaw face 22 and 24 and rib 100. For example, as shown, each jaw face 22 and 24 is formed with teeth 22A and 24A, respectively. Another option is to provide a non-skid material (e.g., rubber) on each jaw face 22 and 24. Still another option is to provide such a non-skid material on top of teeth 22A and 24A. 
     Lever arms 12 and 14 extend away from the opposing jaws (formed by ends 12A and 14A) on either side of rib 100. In the illustrated example, lever arm 12 extends (at least partially) over object 110 at end 12B while lever arm 14 extends (at least partially) over object 112 at end 14B. To secure clamp 10 to rib 100, and objects 110 and 112 to base structure 102, a jacking mechanism cooperates with each end 12B and 14B. By way of example, each jacking mechanism is a threaded screw 32 and 34 that is in threaded engagement with respective and 12B and 14B of lever arms 12 and 14. Each screw 32 and 34 can be provided with a base 32A and 34A to facilitate turning of the screws and to distribute pressure exerted by the screws when clamp 10 is secured to rib 100 as will now be explained. Also, screws 32 and 34 can be provided with hex sockets 32B and 34B to aid in the turning of the screws. 
     In operation, the opposing jaws formed by ends 12A and 14A are held in an open position and placed over rib 100 as shown in FIG. 1A. Objects 110 and 112 are positioned on base structure 102 on either side of rib 100 such that they are between respective screws 32 and 34 and base structure 102. Screws 32 and 34 are then rotated towards base structure 102 until they engage objects 110 and 112. Rotation of screws 32 and 34 continues until jaw faces 22 and 24 engage rib 100. At this point, screws 32 and 34 are further rotated until a required axial force, represented by the arrows designated F A , is applied to respective objects 110 and 112. At the same time, lever arms 12 and 14 move such that the opposing jaws formed by ends 12A and 14A securely grip rib 100 with a gripping force, represented by the arrows designated F G , applied through jaw faces 22 and 24. The use of bases 32A and 34A distribute the axial force F A  applied to each of objects 110 and 112. 
     The compressive or gripping force F G  applied at jaw faces 22 and 24 to rib 100 varies in proportion to the axial force F A  exerted by screws 32 and 34 on objects 110 and 112. Typically, rib 100 is made of a rigid material. However, objects 110 and 112 may be delicate instruments (e.g., sensors). Accordingly, the gripping force F G  applied to rib 100 can typically be greater than the axial force F A  applied to objects 110 and 112. The ratio of F G  to F A  varies with the width W of rib 100 (and therefore the width of the opposing jaws formed by ends 12A and 14A), the distance D from pivot point 18 to a point that is centrally located in the area between jaw faces 22 and 24 subjected to gripping force F G , and the distance L from each of screws 32 and 34 to pivot point 18. 
     In the illustrated embodiment, the opposing jaws formed by ends 12A and 14A are identically sized and shaped. In this way, pivot point 18 is centrally positioned over rib 100 as the compressive or gripping forces are applied thereto. This provides a stable clamp structure in which the compressive forces are balanced on either side of rib 100. 
     The advantages of the present invention are numerous. Neither a base structure nor its ribs need to be modified when used in conjunction with the subject rib clamp. The apparatus secures the clamp to the rib and also secures one or more objects to the base structure. Thus, securing (and removal) of the objects is accomplished simply and without the use of any bonding agents. This is especially important when the objects to be secured are sensors (e.g., thermal, acoustic, etc.) that require direct contact with the base structure. Also, the apparatus can be utilized as a lifting device with the clamp secured to the rib and the screws engaging the base structure directly. 
     Although the present invention has been described relative to a specific embodiment thereof, it is not so limited. For example, as shown in FIG. 2, base structure 102 may have a rib 120 that is constructed in the shape of an I-beam. Lever arms 42 and 44 could then be C-shaped at respective ends 42A and 44A such that the opposing jaws formed thereby positively engaged the I-beam shaped construction of rib 120. 
     As mentioned above, the rib clamp of the present invention can be modified to secure a plurality of objects on either side of the rib to which it is clamped. Such a modification is shown in FIG. 3 where a plurality of screws 32C, 32D, . . . and 34C, 34D, are positioned in successive fashion along, and threaded through, ends 12B and 14B. Screws 32C and 34C are used to generate the necessary gripping force on rib 100 while securing objects 110C and 112C. Remaining screws 32D and 34D, . . . can be used to secure corresponding objects 110D and 112D, . . . to base structure 102. Any screws not needed could be removed from ends 12B and 14B. 
     Thus, it will be understood that many additional changes in the details, materials, steps and arrangement of parts, which have been herein described and illustrated in order to explain the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claims.