fig1 - 11 depict one of a pair of convertible skates 20 in accordance with the present invention . referring to fig1 and 11 , the skate 20 includes a boot 22 having an upper vamp section 24 , a lower vamp section 26 and a sole 28 . the sole includes a front ball receiving area 30 and a rear heel area 32 . the lower vamp section 26 extends generally upwardly from the sole to provide support for the lower foot area . the upper vamp section 24 includes a typical opening to receive a user &# 39 ; s foot . the boot 22 may be molded of an appropriate synthetic material . referring to fig1 and 3 , the boot 22 permanently carries or includes front and rear attachment frame members 40 , 42 , respectively . the frame members 40 , 42 , specifically the peripheries thereof , generally follow the foot or sole profile of the boot to provide better responsiveness and performance when a ski , skate or blade is installed . each frame member 40 , 42 includes a front end 46 , 48 , respectively , a rear end 50 , 52 , respectively , and opposite sides extending between the front and rear ends . the rear frame member 42 has a generally parallel , inwardly facing edges 54 which extend parallel with the longitudinal center line of the boot , represented by line a in fig3 . similarly , the front frame member 40 has edges 54 &# 39 ; but , toward the front of the boot , the edges 54 &# 39 ; curve or angle toward each other . referring to fig4 and 7 , the skate of the present invention includes an interchangeable ski assembly 60 including a ski 62 and an adapter 64 . the adapter 64 includes attachment means for releasably engaging the front and rear frame members 40 , 42 fixedly connected to the sole 28 of the boot 22 . specifically , the rear portion 66 of the adapter 64 includes a rear flange 67 and opposed sidewall portions 68 , each having a groove 70 along its outer surface . the grooves 70 are defined by upper and lower opposed surfaces and innermost recessed surfaces , are generally parallel to the adapter upper surface 72 . the inside edges 54 of the rear attachment frame member 42 are adapted to enter the grooves 70 wherein they are closely engaged and wherein the rear 66 of the adapter 64 is held close to the heel area of the sole 28 of the boot 22 . the adapter 64 includes a front portion 80 carrying a front tongue 65 and opposed grooves 82 on the outside edges thereof . the grooves 82 are adapted to receive the side edges 54 &# 39 ; of the front attachment frame member 40 . referring to fig2 and 3 , fastening means are provided to retain the adapter 64 in the front and rear frame members 40 , 42 . the rear portion 66 of the adapter 64 and the front of the frame member 42 include a threaded portion 84 and 84 &# 39 ; for receiving a fastening member 86 such as an allen - headed bolt . the bolt 86 is inserted in an opening 88 and as depicted in fig2 a tool or allen wrench may be used to engage the bolt 86 with the threaded portions 84 , 84 &# 39 ; to fasten the adapter 64 in place relative to the boot . similar fastening structure may be provided for the wheel and blade trucks . referring to fig7 and 9 - 11 , the present invention includes a ski 62 . the ski includes a typical , generally planar bottom surface 92 ( shown in fig1 ), including a rear steering channel 94 and an upturned , generally pointed tip 96 . steel side edges 95 may be provided . referring specifically to fig9 just rearwardly from the tip 96 , the ski 62 includes a front tongue receiving shoulder 98 with a flange 99 . the shoulder 98 receives the front tongue 65 of the adapter 64 , and includes rounded side guide surfaces , both indicated at 100 , for guiding the tongue 65 into alignment with the central longitudinal axis of the ski 62 . the ski 62 also includes a rear mounting shoulder 102 ( fig1 ). the rear shoulder comprises two spaced , generally rectangular upstanding side centering blocks 104 , 106 and a flat - topped center table 108 extending generally perpendicularly between the blocks 104 , 106 and transversely across the ski surface . the ski 62 also carries a manually operable latch mechanism 120 to secure the ski 62 to the adapter 64 with the ski central longitudinal axis generally parallel to the central longitudinal axis of the adapter 64 . the latch mechanism 120 comprises an eccentric camming mechanism 122 pivotally mounted on a wire - like bracket 124 pivotally connected to the center table 108 . in use , when the ski 62 is positioned on the adapter 64 , and the rear flange 67 of the adapter 64 is in contact with the center table 108 , the camming mechanism 122 is pivoted to engage the flange 67 and to secure the ski 62 to the adapter 64 ( as shown in fig1 ). a handle 126 is provided on the cam mechanism 122 and the cam mechanism 122 includes a generally central rubberized resilient portion 128 so that it can be operated more easily and to bias it in place . in use , the wheeled truck 19 ( shown in fig2 and 7 ) is removed from the boot 22 of the present invention by loosening the allen - bolt 86 and sliding it rearwardly relative to the boot 22 as depicted in fig2 . the truck 19 is slid rearwardly and removed to open the front and rear mounting frames 40 , 42 to receive the adapter 64 ( fig3 and 4 ). next , the user may attach the ski assembly 60 to the boot 22 . this is done with the adapter 64 separated from the ski 62 as depicted in fig4 . the adapter 64 , particularly the front and rear attachment means thereof , is aligned with the edges 54 &# 39 ;, 54 of the front and rear mounting members 40 , 42 of the boot . the adapter 64 is then pushed toward the toe end of the boot 22 and the allen bolt 86 is inserted in the aperture 88 at the rear end of the adapter 64 above the flange 67 and tightened in place to lock the adapter to the boot 22 . to attach the ski 62 , the tongue 65 of the adapter is inserted into the front mounting shoulder 98 of the ski 62 and the flange 67 at rear of the adapter is placed between the spacer blocks 104 , 106 thereby aligning the longitudinal axes of the ski 62 , the adapter 64 and the boot 22 . the boot is lowered with respect to the ski until the flange 67 contacts the center block 108 . the latch mechanism 120 can be manipulated as outlined above and as depicted in fig8 to fully lock the ski 62 in place on the adapter 64 . a particular advantage of the present invention is that when the user is finished snow skating , the latch mechanism 120 can be released and the user may simply step away from the ski 62 . the bottom walking surface 130 of the adapter ( as shown in fig4 - 6 ) enables the user to walk safely and in a generally normal walking motion and pace away from the place of exercise . this ski removal feature avoids damaging the snow contacting bottom surface of the ski 62 and is much more comfortable for the user . any suitable material , such as appropriate polymers , plastics or fiberglass may be used to form all or a portion of the boot , the interchangeable wheeled trucks , blade trucks or ski assemblies of the present invention , provided that the selected material is sufficiently strong and light . the latch mechanism 120 may take the form of a spring - loaded detent system or a typical ski binding system . additionally , it may be modified to provide an automatic safety release or kick - off mechanism for the ski 62 . these skis for use in the present invention may be of selected length depending upon the skill of the user and the desired performance characteristics of the ski . the wheeled or blade trucks for use in the present invention may be of the type disclosed in u . s . pat . no . 4 , 932 , 675 , but any suitable wheel or skate assembly may be used . although a description of the preferred embodiment of the present invention is presented , various changes , including those mentioned above , could be made without deviating from the spirit of the present invention . it is therefore desired that reference be made to the appended claims rather than to the foregoing description to indicate the scope of the invention .
the skate of the present invention includes a foot receiving boot having a substantially rigid shell and sole . a frame is fixedly attached to the sole and includes a forward frame portion and a rear frame portion . the frame portion , and thus the skate , is adapted to receive interchangeably a wheeled truck for in - line roller skating , a blade - carrying truck for ice skating , and a ski for use on snow . the ski assembly includes a ski member and an adapter wherein the adapter is releasably attached to the boot and the ski is releasably connected to the adapter . the adapter includes a bottom surface that facilitates walking when the ski is removed .