as illustrated in fig1 - 10 , the present invention is a belay device , indicated generally at 10 , for use in climbing activities and the like . the belay device 10 of the present invention is moveable from a released first position to an impeded second position and can be used by climbers and others during any type of climbing activity including , but not limited to , mountaineering , rock climbing , safety descents during emergencies and rescues , etc . other uses for the belay device 10 are also within the scope of the present invention . as illustrated in fig1 and 2 , the belay device 10 of the present invention includes a swivel plate 12 having a swivel lobe 14 and a handle 16 extending from the swivel plate . the handle 16 can be formed as part of the swivel plate 12 or can be fixedly attached to the swivel plate 12 , depending on the desires of the manufacturer . in addition , the belay device 10 of the present invention includes a base plate 18 pivotally connected to the swivel plate 12 . preferably , the base plate 18 also includes a base lobe 20 and a carabiner receiving hole 22 for receiving a carabiner ( not shown ). preferably , both the swivel lobe 14 and the base lobe 20 are integrally formed with the swivel plate 12 and the base plate 18 , respectively . the belay device 10 of the present invention further includes a connecting pin 24 extending through the swivel plate 12 and the base plate 18 thereby allowing the swivel plate 12 to rotate relative to the base plate 18 and the base plate 18 to rotate relative to the swivel plate 12 . the connecting pin 24 extends through aligned pin - receiving apertures 26 in the swivel plate 12 and the base lobe 20 of the base plate 18 . the connecting pin 24 can be secured through the swivel plate 12 and the base plate 18 with a nut or other fastening means . as mentioned above , at least one of the plates 12 , 18 is rotatable about the connecting pin 24 . in an embodiment of the belay device 10 of the present invention , the connecting pin 24 can be integrally formed with the swivel plate 12 and extend therefrom into the hole in the base lobe 20 of the base plate 18 . when the belay device 10 is assembled , the plates 12 , 18 and the lobes 14 , 20 define a channel 28 through which a rope 29 is fed . because the swivel plate 12 and the base plate 18 can rotate with respect to each other about the connecting pin 24 , the swivel lobe 14 and the base lobe 20 can be brought closer together to impede the movement of the rope 29 through the belay device 10 , or separated to allow the rope 29 to move through the belay device 10 more freely . fig3 illustrates the belay device 10 of the present invention while in use where the rope 29 is free to move through the belay device 10 . as illustrated in fig3 , the swivel lobe 12 and the base lobe 20 are sufficiently separated , widening the channel 28 , allowing the rope 29 to move freely through the belay device 10 . putting pressure on the handle 16 , as illustrated in fig3 , increases the separation between the swivel lobe 14 and the base lobe 20 . fig4 illustrates the belay device 10 of the present invention while in use where the rope 29 is impeded in its movement through the belay device 10 . as illustrated in fig4 , the swivel lobe 14 and the base lobe 20 are urged toward each other , narrowing the channel 28 through which the rope 29 moves thereby slowing or stopping movement of the rope 29 through the belay device 10 . it should be noted that the carabiner receiving hole 22 and the pivot point through the base lobe 20 are offset . in fact , when the rope is under tension , the carabiner receiving hole 22 is aligned in the direction of the rope tension thereby allowing movement of the swivel plate 12 and the base plate 18 relative to each other and causing narrowing of the channel 28 . when there is a pull on the rope 29 ( e . g ., the upper portion of the rope 29 shown in fig4 is placed under tension ), such as would occur if the climber attached to the rope 29 fell , the swivel plate 12 will naturally be pulled upward by the rope 29 ( as indicated by the arrow in fig4 ). this upward movement of the swivel plate 12 narrows the channel 28 and either slows or stops movement of the rope 29 through the belay device 10 . it should be noted that the swivel lobe 12 and the base lobe 20 can be of a wide variety of shapes to better grip the rope 29 when urged toward each other and are not limited by the shapes described and illustrated herein . in fact , the swivel lobe 12 and the base lobe 20 can be identically shaped or shaped differently from each other . as illustrated in fig6 , a plurality of teeth 30 can be added to the base lobe 20 of the base plate 18 and / or the swivel lobe 14 of the swivel plate 12 . the teeth 30 are preferably disposed along the surface of the lobe 14 or 20 that helps define the channel 28 through which the rope 29 moves through the belay device 10 . consequently , the teeth 30 enhance the grip the belay device 10 exerts on the rope 29 , particularly if the channel 28 is narrowed and the rope 29 slowed or stopped due to the climber &# 39 ; s fall or other emergency . as illustrated in fig7 , the base plate 18 can have a slot 32 around its peripheral edge . a tab 34 on the swivel plate 12 rides along this slot 32 when the swivel plate 12 and the base plate 18 move relative to each other providing additional stability to the belay device 10 . referring now to fig8 - 10 , in another embodiment of the belay device 10 of the present invention , the handle 16 is rotatably secured to the base plate 18 rather than the swivel plate 12 . the handle 16 is rotatable and includes a spring mechanism 36 for biasing the handle 16 into the impeded second position . when the handle 16 is in the impeded second position , the swivel plate 12 and the base plate 18 are positioned such that the channel 28 is narrowed about the rope 29 to impede the travel of the rope 29 through the channel 28 . when the handle 16 is moved toward a second position , the swivel plate 12 and the base plate 18 are moved such that the channel 28 is widened allowing the rope 29 to freely travel through the channel 28 . if the climber attached to the rope 29 fell , the handle 16 will return to the impeded second position with the swivel plate 12 being pulled upward by the rope 29 narrowing the channel 28 and either slowing or stopping movement of the rope 29 through the belay device 10 . the swivel plate 12 of the belay device 10 of the present invention includes a handle pin 38 . a downward force on the handle 16 engages the handle pin 38 in a slot 17 on the handle 16 resulting in the base plate 18 moving in opposite rotation of the swivel plate 12 causing the base lobe 20 and the swivel lobe 14 to further separate and widen the channel 28 . the handle pin 38 can be formed on the swivel plate during manufacture of the belay device or be a separate piece added after manufacture is completed . in addition , the base plate 18 includes a shelf 50 for following a guide 52 on the swivel plate 12 . the guide 52 maintains the base plate 18 relative to the swivel plate 12 during rotation of the swivel plate 12 relative to the base plate 18 . referring now to fig1 and 12 , the belay device 10 of the present invention includes a second swivel plate 40 rotatably mounted to the opposite side of the base plate 18 . the second swivel plate 40 includes a second swivel lobe 42 and the base plate 18 includes a secondary base lobe 44 thereby forming a second channel for receiving a second rope 48 . operation of the belay device 10 of this embodiment of the present invention is similar to the operation described above . in all embodiments , preferably , the swivel plate 12 , the swivel lobe 14 , the base plate 18 , and the base lobe 20 are formed from metal although forming the swivel plate 12 , the swivel lobe 14 , the base plate 18 , and the base lobe 20 from other materials including , but not limited to , plastic , fiberglass , ceramics , resin , etc ., are within the scope of the present invention . in sum , the present invention is a belay device 10 for climbing . the belay device includes a first plate 12 having a first lobe 14 ; a second plate 18 having a second lobe 20 ; a connecting pin 24 connecting the first plate 12 and the second plate 18 together and allowing the first plate 12 and the second plate 18 to rotate relative to each other ; and a channel defined by the first plate 12 , the second plate 18 , the first lobe 14 , and the second lobe 20 through which a rope 29 moves through the belay device 10 . tension on the rope 29 rotates the first plate 12 to narrow the channel 28 by moving the first lobe 14 and the second lobe 20 toward each other thereby impeding or inhibiting movement of the rope 29 through the belay device 10 . the foregoing exemplary descriptions and the illustrative preferred embodiments of the present invention have been explained in the drawings and described in detail , with varying modifications and alternative embodiments being taught . while the invention has been so shown , described and illustrated , it should be understood by those skilled in the art that equivalent changes in form and detail may be made therein without departing from the true spirit and scope of the invention , and that the scope of the present invention is to be limited only to the claims except as precluded by the prior art . moreover , the invention as disclosed herein , may be suitably practiced in the absence of the specific elements which are disclosed herein .
a belay device for climbing with at least one rope is provided . the belay device comprises a first plate having a first lobe with the rope wrapping at least partially about the first lobe and a second plate having a second lobe . a connection mechanism connects the first plate to the second plate through a rotation point with the rotation point positioned inside the second lobe . a first channel is defined by the first plate and the first lobe and the second plate and the second lobe with the rope moveable through the first channel wherein tension on the rope rotates the first plate and the second plate relative to each other thereby narrowing the first channel and impeding movement of the rope through the first channel .