in fig1 and 2 there is shown a preferred embodiment of mounting device 10 comprising a channel body member 12 having spaced - apart parallel sides and a top member connecting the two sides . preferably the top member is perpendicular to the sides , as shown . it is also preferred for the sides and the top member to be generally planar . the body member is preferably made of metal ( e . g ., aluminum ) or it may be composed of plastic ( e . g ., lexan , nylon , etc .) or it may be composed of separate layers of metal and plastic , for example . the two sides include registering apertures 12a for slidably receiving a key member 14 after the open bottom of the mounting body 12 has been positioned over a cleat 20 or other desired substrate . the key member secures the body 12 to the mounting substrate . preferably the two sides also include registering apertures 12b which are spaced further apart than apertures 12a . a different key member may be used for inserting through apertures 12b in order to secure the body member to the desired substrate . this is illustrated in fig3 where the body 12 is positioned over rail 30 , and key member 16 is slidably received in the apertures 12b . the prongs of the key member extend below the rail 30 to retain the body 12 on the rail . the top member of the body 12 can serve as an attachment surface or base on which any desired item may be secured ( e . g ., by screws or bolts passing through apertures 13 ). for example , a fishing rod holder can be secured to the top . the mounting device may also be mounted to a mounting block 22 which includes transverse apertures 23 which extend through the block . the block may be secured to any desired substrate by bolts or screws extending through apertures 24 . another embodiment of mounting device 32 is shown in fig5 which is cylindrical and includes a notch or recess 34 in its lower side . the portion of the cylindrical body on opposite sides of the recess form legs for the device . spaced - apart registering openings 36 extend transversely through the legs for slidably receiving a key member to connect the device to a desired mounting substrate . any desired item may be secured to the top of the cylindrical body 32 . in fig6 there is shown a fishing rod holder 40 which has been secured to the upper surface or top of a mounting device of fig1 . apparatus of this type may be mounted to a cleat or rail of a boat , for example . fig7 illustrates another type of fishing rod holder 42 secured to the body member 12 . in this embodiment the arms 42a of a fishing rod holder pass directly through openings in the side members of the body 12 and are secured in any desired position by means of j - bolts 44 . the body 12 can be fastened to any desired mounting surface ( e . g ., a cleat or rail ) by means of either key 14 or key 16 . if desired , the free ends of key 16 may be threaded for enabling a nut or other threaded fastener to be attached after the key is inserted through body 12 . fig8 is an exploded view showing the mounting device of fig1 which can be attached to a telescoping stand 50 , for example . leg members 52 can be moved upwardly or downwardly and then secured in any desired position by means of bolt 53 . the upper end 54 of the stand 50 includes spaced - apart apertures 54a . when the mounting device is positioned over the upper end 54 of the stand , the key 14 can be inserted through the registering openings 12a and 54a to secure to device 10 to the stand . any desired device , e . g ., a fishing rod holder , can be secured to the upper surface of the mounting device . fig9 illustrates another embodiment of mounting device of the invention which further includes a spring member 15 which is secured at each of its ends to one of the sides of the body member 12 . the spring can be extended around both legs of a key member 16 in order to retain the key member in its inserted position , as shown . thus , the spring prevents the key from sliding out of the apertures of the body member due to vibration , for example . fig1 and 11 illustrate another type of retention member 17 which is secured to one side of the body 12 . this type of retention member includes downwardly extending leg members 17a which are adjacent the apertures in the sides which receive the prongs of key member 16 , and leg members 17b are adjacent the apertures in the sides which receive the prongs of key member 14 . the lower edges of the legs 17a ( and 17b ) frictionally contact the prongs of the key members 16 ( and 14 ) and prevent the key members from easily sliding out of the body member 12 . if desired , the key members may include indentations or notches for engagement with the legs of the retention member . fig1 illustrates a fishing rod holder secured to a mounting device of the invention which includes another type of retention means to retain the key member 16 in the body member 12 ( which is shown mounted on rail 30 ). the retention means comprises a curved spring band 19 whose ends frictionally engage the prongs of the key 16 . fig1 is a perspective view showing another embodiment of mounting device 60 of the invention comprising channel body member 62 having spaced - apart parallel sides and a top member 63 connecting the two sides . any desired component or device can be secured to the top of the body 62 . a movable plate member 64 is positioned in the channel between the two sides . the screws or eye bolts 68 engage the plate 64 and are adapted to move the plate away from the interior surface of one of the sides of body 62 and toward the opposite side . this is advantageous for causing the body 62 to firmly grip or more closely engage the substrate to which the body member is being attached . the screws or bolts 66 serve as key members to lock the body onto a desired cleat or rail . for this embodiment the bolts 66 may be threadably received in threaded openings in the back wall of the body 62 ( or if such openings are not threaded , one may use threaded fasteners on the ends of bolt 66 to retain the bolts in place ). fig1 illustrates a fishing rod holder secured to the top of another embodiment of mounting device 70 of the invention comprising body member 72 . plate member 74 is positioned between the sides of the body 72 . bolts or pins 66 extend between the sides of the body and retain the plate 74 within the body member . bolts 66 also help to secure the body 72 to a desired substrate and also prevent or retard tilting of the body member relative to a substrate on which the body is mounted . by rotating the threaded bolts 75 in one direction the plate member is caused to move away from one side of the body to the other for the purpose of causing the body to firmly grasp or more closely engage the substrate to which it is being attached . spaced - apart registering apertures 72a are for receiving a key member for attaching the body 72 to the desired substrate ( e . g ., a cleat on a boat ). fig1 shows another type of fishing rod holder 80 secured to the top of a mounting device of the invention . the fishing rod holder includes a bracket 82 to which is attached an alarm system 84 for signalling when a fish strikes the line of a fishing rod supported in holder 80 . fig1 and 17 illustrate another embodiment of mounting device 90 of the invention comprising a channel body member 92 having spaced - apart sides which include apertures 92a and 92b . the top member 93 includes apertures to facilitate attachment thereto of any desired component . one side of the body member includes apertures 92c to enable arm 94 to be attached thereto for locking side movements . because there are several apertures 92c in an arc , the arm 94 can be secured thereto at any desired angle relative to the body . other variants are possible without departing from the scope of this invention . for example , the length , width and height of the body member may vary as desired .
a mounting device is described which includes a channel having a top and spaced - apart sides . registering openings are present in the sides . a key having elongated prongs is slidably received in the openings . the mounting device is useful in mounting a variety of objects to a desired substrate .