referring to fig1 , in a preferred embodiment , the oral exercise device 10 of the present invention includes an upper lever 12 that has a superior surface 14 , an inferior surface 16 , a proximal end 18 and a distal end 20 . additionally , the oral exercise device 10 includes a lower lever 22 that has a superior surface 24 , an inferior surface 26 , a proximal end 28 and a distal end 30 . the upper lever 12 and the lower lever 22 are preferably constructed of a stiff material , such as plastic . the upper lever 12 and the lower lever 22 are preferably rectangular and of equal length , sufficient to extend from a hard palate of a human subject to just outside a mouth of the subject . however , the upper lever 12 and the lower lever 22 may have rounded edges to increase the comfort to the subject . finally , the upper lever 12 and the lower lever 22 are preferably of a width that is less than the width of the mouth of the subject to also increase the comfort to the subject . a pivoting element 32 is located at least midway , and preferably outside the subject &# 39 ; s mouth , between the proximal end 18 and the distal end 20 of the inferior surface 16 of the upper lever 12 . alternatively , the pivoting element 32 may be located at least midway , and preferably outside the subject &# 39 ; s mouth , between the proximal end 28 and the distal end 30 of the superior surface 24 of the lower lever 22 . a pivoting element receiver 34 is located at least midway , and preferably outside the subject &# 39 ; s mouth , between the proximal end 28 and the distal end 30 of the superior surface 24 of the lower lever 22 , at a distance that is complimentary to the pivoting element 32 when the pivoting element 32 is on the upper lever 12 . alternatively , the pivoting element receiver 34 may be located at least midway , and preferably outside the subject &# 39 ; s mouth , between the proximal end 18 and the distal end 20 on the inferior surface 16 of the upper lever 12 , at a distance that is complimentary to the pivoting element 32 when the pivoting element 32 is on the lower lever 22 . as shown in fig1 , the pivoting element 32 may be triangular and the pivoting element receiver 34 a recess to receive a tip of the triangle . alternatively , and as shown in fig5 , the pivoting element 32 may be cylindrical and the pivoting element receiver 34 a socket to receive the cylinder . the cylinder and socket arrangement can be manufactured whereby the cylinder snaps into the socket , helping to add even greater stability to the oral exercise device 10 during operation . regardless of the shape , the pivoting element 32 and pivoting element receiver 34 are preferably molded into the upper lever 12 and the lower lever 22 , and thus made of the same material as the upper lever 12 and the lower lever 22 . referring again to fig1 , a resistance element 36 may be removably attached to at least one resistance element receiver 38 that encircles both the upper lever 12 and the lower lever 22 . the resistance element receiver 38 need be no more than a notch or a groove with a width and depth that fits the resistance element 36 in the upper lever 12 and in the lower lever 22 . the resistance element 36 is preferably at least one elastic band , though the resistance element 36 may also be a spring . as shown in fig3 , the spring may be a torsion spring . alternatively , and as shown in fig4 , the spring may be a compression spring . furthermore , it is contemplated that the resistance element 36 could be an elastic material attached between the inferior surface 16 of the upper lever 12 and the superior surface 24 of the lower lever 22 . as shown in fig5 , when the resistance element 36 is an elastic band , it may be more than one elastic band , which are sequentially added to at least one resistance element receiver 38 to increase the level of resistance . the multiple elastic bands could either be of the same thickness or of gradually increasing thickness to widen the range of resistance . as shown in fig3 , when the resistance element 36 is a torsion spring , the ends of the spring may be also be integrated into the oral exercise device 10 . however , the ends of the spring may be manufactured to removably attach to the resistance element receiver 38 . alternatively , and as shown in fig4 , when the resistance element 36 is a compression spring , one end of the spring is attached by an adhesive or integrated into to the inferior surface 16 of the upper lever 12 , while the other end of the spring would be attached by an adhesive or integrated into the superior surface 24 of the lower lever 22 . referring again to fig1 , the oral exercise device 10 may include a stabilizer 40 . the stabilizer 40 should preferably be in the form of a cylindrical rod running through the upper lever 12 and the lower lever 22 . the stabilizer 40 can be constructed of the same material as the upper lever 12 and the lower lever 22 , with the ends of the stabilizer 40 possessing threading , such that the stabilizer 40 can be capped with ends that screw onto it . the stabilizer 40 is preferably used when the resistance element 36 is a spring . the stabilizer 40 should function to prevent twisting or turning of the upper lever and the lower lever , yet should slide between the upper lever and the lower lever so as not to interfere with an exercise . to further aid in stabilizing the oral exercise device 10 , bite blocks 42 that extend radially from the upper lever 12 to a distance that is not wider than the mouth of the subject , but should extend far enough to fit comfortably between the subject &# 39 ; s molars . the bite blocks 42 should be constructed of the same material as the upper lever 12 and the lower lever 22 and preferably molded into the upper lever 12 . continuing to refer to fig1 , the oral exercise device 10 may also include a hard - palate adaptor 46 attached to the superior surface 14 of the proximal end 18 of the upper lever 12 . the hard - palate adaptor 46 is preferably constructed from any material that is comfortable and can assume the shape of a subject &# 39 ; s hard palate . for example , the hard - palate adaptor 46 constructed from dental putty so that it may be custom - molded provides a comfortable fit within a subject &# 39 ; s mouth . the hard - palate adaptor 46 may also be constructed from material similar to that used for mouth guards , as described in u . s . pat . no . 2 , 827 , 899 , such that a custom fit to the subject &# 39 ; s hard palate can be achieved . the hard - palate adaptor 46 is attached to the superior surface 14 of the upper lever 12 by an adhesive or similar material , though the hard - palate adaptor 46 may be screwed into the upper lever 12 or even molded into the upper lever 12 . continuing to refer to fig1 , the oral exercise device 10 may further include a tongue adaptor 48 fastened by an adhesive or screw to the inferior surface 26 of the proximal end 28 of the lower lever 22 . the tongue adaptor 48 can be constructed from any material that will conform to the surface of a subject &# 39 ; s tongue . for example , the tongue adaptor 48 constructed from a plastic that is rigid yet comfortable for the subject meets this need . the tongue adaptor 48 can also be constructed from material similar to that used for mouth guards , as described in u . s . pat . no . 2 , 827 , 899 , such that a custom fit to a subject &# 39 ; s tongue can be achieved . alternatively , the tongue adaptor 48 could be molded into the lower lever 22 and would be constructed from the same material . furthermore , the surface of the tongue adaptor 48 can be roughened to better enable the tongue to grip the tongue adaptor 48 . referring now to fig2 , the oral exercise device 10 may further include a feedback element 44 , which may be fastened by an adhesive or similar material near the proximal end 18 of the upper lever 12 or near the proximal end 28 of the lower lever 22 . it is also acceptable to fasten the feedback element 44 with a screw . as one example , the feedback element 44 can be constructed from any material that will emit a sound when it comes into contact with another surface . additionally , the feedback element 44 may also be constructed to produce a tactile sensation during operation of the oral exercise device 10 that can be sensed by the subject . suitable materials for the feedback element 44 include , but are not limited to metal or plastic shaped like a disc , whereby the convex surface faces either the lower lever 22 when attached to the upper lever 12 or the upper lever 12 when attached to the lower lever 22 . referring now to fig6 , fig7 and fig8 , the oral exercise device 10 may be series of oral exercise devices , each with a resistance element 36 having a gradually increasing level of resistance . as shown in fig6 , the resistance element 36 may be elastic bands of increasing resistance . alternatively , and as shown in fig7 , the resistance element 36 may be torsion springs of increased resistance . finally , and as shown in fig8 , the resistance element 36 may be compression springs of increasing resistance . in operation , and now referring to fig2 and fig9 , the proximal ends 18 , 28 of the upper lever 12 and the lower lever 22 are inserted into the subject &# 39 ; s mouth . at this position , the proximal ends 18 , 28 of the upper lever 12 and the lower lever element 22 are a mutually separated position . the subject then pushes upward on the inferior surface of the lower lever element 22 with his or her tongue . if a tongue adaptor 48 is present on the lower lever element 22 , then the subject pushes upward on the tongue adaptor 48 . the resistance element 36 provides the resistance to a force applied by the subject &# 39 ; s tongue . the lower lever element 22 is pushed upwards until the feedback element 44 emits a sound . as shown in fig9 , at this position the proximal ends 18 , 28 of the upper lever element 12 and the lower lever element 22 are now in a mutually adjacent position . the subject may then relax his or her tongue , allowing the proximal ends 18 , 28 of the upper lever element 12 and the lower lever element 22 to return to the mutually separated position and repeat the exercise . the above description has been that of a preferred embodiment of the present invention , it will occur to those that practice the art that many modifications may be made without departing from the spirit and scope of the invention . in order to apprise the public of the various embodiments that may fall within the scope of the invention , the following claims are made .
an oral exercise device that is portable , that has adjustable resistance and that allows the tongue to perform isotonic exercises in an environment that closely approximates the natural configuration of the tongue and the mouth to improve disorders of speech and swallowing .