exercise device 10 is illustrated in fig1 constructed of left body member 12 and right body member 14 connected through horizontal rod connection member 16 , rear upper horizontal member 18 and front upper horizontal member 20 . all of these members may be constructed of a variety of materials including thermoplastic polymers , wood , aluminum and any of the various materials of that class . it is preferably light in weight and may be connected in to a integral unit permanently or may be able to be broken down by providing that each member force fit into the other . device 10 may be used in any horizontal position and the sides are identified for clarity purposes only . rear upper horizontal member 18 is connected at end 24 to upper end section 38 of right body member 14 and at end 26 to upper end section 34 of the left body member 14 . likewise , front upper horizontal member 20 is connected at end 30 to upper end section 40 of right body member 14 and at end 32 to upper end section 36 of left body member 12 . horizontal member 18 provides horizontal top surface 22 while front horizontal member 20 provides horizontal top surface 28 . with body members 12 and 14 connected together , a curved rocking plane is formed by curved bottom surface 42 of member 12 and curved bottom surface 44 of member 14 on which device 10 rocks forwardly and backwardly to aid in the exercise of the hand and wrist . curved bottom surface 42 includes center section 46 as well as rear curved end section 48 and front curved end section 50 . the sections of curved bottom surface 44 are shown in fig2 consisting of center section 58 , front curved section 60 and rear curved section 62 . in this embodiment , the center sections of bottom curved surfaces 42 and 44 are each about one inch long with a curvature of a radius of about five inches with the front and rear curved sections having a radius of about two inches . the vertical distance between a line drawn between upper horizontal surfaces 22 and 28 and a line drawn between center sections 46 and 58 is about four inches . the length of the upper horizontal surfaces are both about four inches . in fig3 through 4b , use of device 10 is illustrated . fig3 through 3b illustrate flexion and extension movements while fig4 through 4b illustrate ulnar and radial deviation movements . in fig3 hand 52 is placed on device 10 resting digits 54 two through four ( digits three and four are hidden ) on front horizontal top surface 28 and the inside of wrist 55 on rear horizontal top surface 22 spanning the distance of about six inches between these upper horizontal surfaces . device 10 rests with center sections 46 and 48 resting on table surface 56 . in fig3 a , pressure is applied by the digits to rock the device 10 forwardly on front curved sections 50 and 60 bending wrist 55 in a flexion movement up to a maximum range of movement of about eighty degrees . while continuing to maintain the digits 54 and wrist on the upper horizontal surfaces , device 10 is rocked rearwardly as illustrated in fig3 b rocking the device onto rear curved end sections 48 and 62 conducting an extension exercise up to a maximum range of motion of about seventy degrees . this exercise is repeated a multiplicity of repetitions for best benefit . to conduct the ulnar and radial deviation exercise hand 52 is placed on device 10 as illustrated in fig4 with the end of digit four 64 resting on front upper surface 28 and side of wrist 55 resting on rear upper horizontal surface 22 with the hand 52 in a generally vertical position . again at the start of this exercise , and when at rest , device 10 rests on center sections 46 and 58 . in conducting ulnar deviation movement , as illustrated in fig4 a , device 10 is rocked forwardly so that it rests on front curved sections 50 and 60 to attain a maximum range of motion of about thirty degrees . continuing exercise as illustrated in fig4 c , device 10 is rocked rearwardly so that it rests on rear curved end sections 48 and 62 on table surface 56 to achieve radial deviation up to a maximum range of motion of about twenty degrees . although not illustrated , the device can also provide a pronation and supination exercise . the thumb and little finger ( first and fifth digits ) are stretched across the device , one resting on the front horizontal surface 22 and the other resting on the rear horizontal top surface 28 . again , the device is rocked forwardly and rearwardly on the curved plane of the bottom surfaces 42 and 44 to achieve a range of motion close to the maximum . the balance of the embodiments illustrated in the later figures all include mechanisms to adjust the distances between the upper horizontal surfaces . it also should be understood that the invention includes a continuous horizontal surface stretching between the front and rear upper horizontal surfaces . to conserve material and to limit the weight of the device it is preferred to provide an adjustment that allows the distance between the upper horizontal surfaces to be reduced to about five inches and increased to about seven inches to compensate for different hand sizes . in fig5 and all subsequent figures all similar elements to that of device 10 are designated with a &# 34 ; prime &# 34 ; or multiple &# 34 ; primes &# 34 ; after any number designation identifying an element of device 10 . in device 68 , as shown in fig5 all the upper end sections of the body members are separate part extensions although only upper end section 34 &# 39 ; is illustrated . upper end 70 of left body member 12 &# 39 ; interfits between depending sections 72 and 74 of upper end section 34 &# 39 ;. bolt 76 extends through aligned holes through sections 72 and 74 and end 70 sandwiched between the two depending members . wing nut 78 pressures the three parts together to hold upper end extension 34 in any chosen position . the balance of device 68 is similar to device 10 and similar attachments are provided for the balance of the three upper end sections / extensions 36 &# 39 ;, 38 &# 39 ;, 40 &# 39 ;, not illustrated herein . a portion of device 80 , again like device 10 where not shown , is illustrated in fig6 showing connection between the body members and the separate but connected upper end extensions 34 &# 34 ;, 36 &# 34 ;, 38 &# 34 ;, and 40 &# 34 ;. spaced teeth 82 are positioned on a convex arc on the ends of base body member 12 &# 34 ;. as shown in fig6 teeth 82 engage complimentary teeth 84 opposed and extending from a concave surface of upper end extension 34 &# 34 ;. as further illustrated in fig6 a , the two parts are held together in pivotal connection by bolt 86 with spring 88 positioned in recess 90 allowing body member 12 &# 34 ; to be biased away from engagement of extension 34 &# 34 ;, to disengage teeth 82 and 84 from each other . as shown in fig6 b , this mechanism allows the radial alignment of member 34 &# 34 ; from body member 12 &# 34 ; to change the length between the upper horizontal surfaces as illustrated in fig6 c . once aligned to the right distance , engagement is released to allow the teeth to reengage under spring pressure to hold the device as illustrated in fig6 a . device 92 as shown in fig7 and 7a incorporates an alternative embodiment for adjustment of distance between the upper horizontal surfaces as well as a modified front upper horizontal member 102 . adjustment of the length between the upper horizontal surfaces is attained by providing upper end 94 of base member 12 &# 39 ;&# 34 ; with serrated hole 96 and providing a complimentary overlapping extension 98 with ridged pin 100 force interfitting into hole 96 in various radial positions to adjust the angle between extension member 36 &# 39 ;&# 34 ; and base member 12 &# 39 ;&# 34 ;. front horizontal member 102 includes round rod ends which interfit into horizontal holes 104 on the inside surfaces of extension members 36 &# 39 ;&# 34 ; and 40 &# 39 ;&# 34 ; with a force fit , but allowing the member to be rotated in position for other exercises . rings 106 are sized to receive the fingers of the hand for improved stability of the device during exercise of flexion and extension . rear upper horizontal member 18 &# 39 ;&# 34 ; is identical to that of member 18 in device 10 . while this invention has been described with reference to the specific embodiments disclosed herein , it is not confined to the details set forth and the patent is intended to include modifications and changes which may come within and extend from the following claims .
an exercise device and method to exercise the wrist and hand of a person at the work station on a desk surface includes a base with a curved bottom surface with front and rear upper horizontal members , the front with finger rings to receive the ends of the digits of the middle fingers while resting the wrist on the rear horizontal member . upper sections of the base are separate and are rotatably adjustable to fix a chosen distance between the two upper horizontal members . the device is used by rocking the device frontwardly and backwardly on the curved surface to exercise and flex the wrist in all six directions .