the exercising apparatus 10 comprises a base 12 and two bumpers 14 attached to opposite end portions of the base . the base 12 includes of a plurality of boards 16 which are connected to each other by hinges 18 ( fig2 ). the upper side of the rectangular base 12 is covered by a flexible glide sheet 20 . the glide sheet 20 is made from plastic . the rigid boards 16 are preferably made of wood or other material , such as hard plastic . the rectangular base 12 has a distance between bumpers 14 of approximately 8 feet . the base 12 has a width of approximately 2 feet . the rectangular sheet 20 has a length and width which is approximately the same as the length and width of the base 12 . the sheet 20 has a thickness of approximately 1 / 8 inch . fig2 shows that the exercising apparatus consists of three boards 16 . however , the number of boards 16 may vary dependent on the desired distance between bumpers 14 and the width of the boards . the bumper 14 generally comprises a cushion part 22 ( fig3 and 4 ) and a support part 24 . the part 24 may be wood , metal or hard plastic . the cushion part 22 is preferably molded with the support part 24 . clearly , other means such , i . e ., as glue , may be used to connect the cushion part 22 with the support part 24 . the bumpers 14 , glide sheet 20 and boards 16 are interconnected by clamp assemblies 26 . each of the releasable clamp assemblies 26 includes a metal bracket 28 , a bolt 30 and a nut 32 ( fig4 ). each of the nuts 32 is mounted in a support part 24 of a bumper . in the illustrated embodiment of the invention , two bolts 30 and nuts 32 are used to secure each of the clamp members 26 with the end portion of a bumper support part 24 . however , any desired number of bolts could be used . the bolts 30 are tightened into the nuts 32 to apply force to the bracket 28 ( fig4 ) and bumper support part 24 to compress the glide sheet 20 between the bumper support part and a board 16 engaged by the bracket 28 . the clamping force applied to the board 16 and glide sheet 20 by the bumper support part 24 and bracket 28 holds the bumper 14 against movement relative to the glide sheet 20 and holds the glide sheet 20 against movement relative to the board 16 . by loosening the bolts 30 for each of the bumpers 14 , it is possible to slide the bumpers along the length of the glide surface 20 to vary the distance between the bumpers and thereby vary the length of the glide stroke of a person exercising with the apparatus 10 . when the exercise apparatus 10 is to be used , a speed skater puts on socks over suitable exercise shoes . the socks provide the shoes with a surface having a low coefficient of friction to enable the feet of the skater to slide over the upper surface of the glide sheet 20 . 0f course , the shoes could have soles which would slide easily over the sheet 20 . the skater then gets on the glide sheet 20 , in the manner illustrated schematically in fig1 . the skater pushes against one bumper 14 with the lower side of one foot , for example , the right foot as shown in fig1 and slides along the plastic sheet 20 toward the opposite bumper 14 . the other foot , that is , the left foot , slides into abutting engagement with the opposite bumper 14 to limit sideward movement of the skater . the skater then pushes off the second bumper with his left foot and slides back toward the first pumper . when the right foot of the skater engages the first bumper , he again pushes off to repeat the sliding movement across the upper surface of the plastic sheet 20 . sliding movement of the skater between bumpers 14 is repeated until the exercises are completed . each time a foot of the skater pushes off against one of the bumpers 14 , the leg muscles are exercised in a manner which is generally the same as when the skater pushes the edge of a blade of a skate against the ice with a power stroke . through consistent practice with the exercise apparatus 10 , the legs of the skater are strengthened in the same manner as which they would be strengthened if he was actually skating on the ice . as the leg strength of the skater increases , the length of the exercise strokes are increased by increasing the distance between the bumpers 14 . when the skater has finished using the apparatus 10 , the bolts 30 and nuts 32 holding the bumpers 14 are loosened and the plastic sheet 20 is removed from between the bumpers 14 and the base 12 . the sheet 20 is then rolled . the base 12 is then folded at the hinges 18 . the rolled sheet 20 and folded base 12 can be easily stored or transported . although the plastic sheet 20 is too thick and rigid to be folded , it is sufficiently flexible to enable the sheet to be compactly rolled . the sheet 20 is rigid enough to transmit forces applied by the gliding movement of the sock covered feet of a skater to the bumpers 14 . thus , if the skater is pushing off with a right foot and gliding with a left foot , as shown in fig1 friction forces applied against the sheet 20 will be transmitted by the sheet to the bumper on the skater &# 39 ; s left ( fig1 ) without forming wrinkles in the sheet . it should be understood that although the base 12 has been illustrated in fig2 as being formed by three boards 16 which are interconnected by hinges 18 , a different number of boards could be used if desired and the boards could be interconnected in a different manner . however , it is believed that it will be preferred to interconnect the boards 16 in such a manner that the base 12 can be compactly collapsed by either completely disconnecting the boards 16 or by maintaining the boards interconnected with the use of suitable hinges , similar to the hinges 18 . it should also be understood that the exercise apparatus 10 may be used by persons who participate in sports other than skating , for example , skiing . in fig1 - 3 , the bumpers 14 are shown as extending perpendicular to the longitudinal central axis of the base 12 . however , when a foot of a skater using the exercise apparatus 10 pushes off against a bumper 14 in the manner previously explained , the side of the foot naturally tends to be turned slightly outwardly at an angle of approximately 10 ° to a path along which a skater would be travelling if he was on ice . to accommodate this natural tendency of feet of the skater to turn outwardly as they push off , the bumpers 14 may be positioned so as to flare outwardly relative to each other . in fig5 the exercise apparatus 10 has been illustrated with the bumpers 14 extending at an acute angle 40 of approximately 80 ° relative to a longitudinal central axis 42 of the base 12 . this results in a side surface 44 ( fig3 ) of each of the bumpers 14 being positioned at the same angle relative to the base 12 as the foot of a skater when the foot engages the side surface 44 of the cushion part 22 of a bumper 14 . the angle at which the bumpers 14 are disposed relative to the base 12 can be adjusted , by releasing the clamp assemblies 26 , to accommodate different foot orientations for different skaters . in the embodiment of the invention illustrated in fig1 - 5 , the base 12 and glide sheet 20 are horizontal when the exercise apparatus is used . however , it is contemplated that the leg muscles of a skater or other athlete may be further strengthened by having the glide sheet extend upwardly to the bumpers . an embodiment of the invention having this construction is illustrated in fig6 . since the embodiment of the invention illustrated in fig6 is generally similar to the embodiment of the invention illustrated in fig1 - 5 , similar numerals will be utilized to designate similar components , the suffix letter &# 34 ; a &# 34 ; be associated with the numerals of fig6 to avoid confusion . an exercising apparatus 10a includes a base 12a and a pair of bumpers 14a attached to opposite end portions of the base . the base 12a includes a plurality of boards 16a which are attached to each other by hinges 18a . the upper side of the rectangular base 12a is covered by a flexible glide sheet 20a . in accordance with a feature of this embodiment of the invention , the boards 16a to which the bumpers 14a are connected , extend upwardly from a horizontal central section of the base . therefore , befor the foot of a skater engages the bumper 14a , the foot must slide upwardly to the bumper . although the bumpers 14a ( fig6 ) extend perpendicular to the longitudinal central axis of the base 12a , it is contemplated that the bumpers could be skewed relative to the longitudinal central axis of the base 12a , in the same manner shown in fig5 to accommodate the angled orientation of a foot of a skater . the boards 16a at opposite ends of the base 12a are supported by wedges or spacer blocks 48 and 50 so that the glide sheet 20a slopes upwardly from a horizontal central section to the bumpers 14a . the wedges 48 and 50 may be formed of any desired material capable of supporting the weight of a skater . however , it is preferred to form the wedges 48 and 50 from a rigid foam or plastic . the wedges 48 and 50 are secured to boards 16a of the base 12a by screws and / or adhesive . the clamp assemblies for the bumpers 14a can be moved relative to the base 12a to adjust the exercise stroke of a skater and / or to adjust the angle which the bumpers make with the longitudinal central axis of the base 12a . although the wedges 48 and 50 have been shown in fig6 as being disposed beneath the boards 16a , the wedges could be disposed between the glide sheet 20a and the boards 16a if desired . when the skater has finished using the apparatus 10 , the clamp assemblies holding the bumpers 14a are loosened and the glide sheet 20a is removed from between the bumpers and the base 12a . the base 12a can then be folded at the hinges 18a . the wedges 48 and 50 can be left connected to the boards 16a or can be disconnected from the boards . in the embodiment of the invention illustrated in fig6 the base 12a supports the glide sheet 20a so that the glide sheet has a generally concave configuration . it is contemplated that it may be desired to provide the glide sheet with a different configuration . in the embodiment of the invention illustrated in fig7 the glide sheet has a convex configuration . since the embodiment of the invention illustrated in fig7 is generally similar to the embodiment of the invention illustrated in fig6 similar numerals will be utilized to designate similar components , the suffix letter &# 34 ; b &# 34 ; being associated with the embodiment of the invention illustrated in fig7 to avoid confusion . the exercise apparatus 10b comprises a base 12b and two bumpers 14b attached to opposite end portions of the base . the base 12b includes a plurality of boards 16b which are connected to each other by hinges 18h . a flexible glide sheet 20b is disposed above the base 12b . in accordance with a feature of this embodiment of the invention , the glide sheet 20b has a convex configuration so that a skater must pull his foot upwardly toward the raised central section of the glide sheet 20b after the foot engages a bumper 14b . to provide the glide sheet 20b with a convex configuration , a plurality of spacer blocks 56 , 58 and 60 are provided between the boards 16b of the base 12b and the glide sheet 20b . the spacer blocks 56 , 58 and 60 have flat bottom side surfaces . the bottom side surfaces of the spacer blocks 56 , 58 and 60 are disposed in abutting engagement with and have the same size as upper side surfaces of the boards 16b of the base 12b . the spacer blocks 56 , 58 and 60 have arcuate upper side surfaces which form a continuously curving support surface for the glide sheet 20b . the spacer blocks 56 , 58 and 60 can be formed of any desired material having sufficient strength to support a skater . however , it is preferred to form the spacer blocks 56 , 58 and 60 of a rigid foam or plastic material . in the embodiment of the invention illustrated in fig7 the spacer blocks are provided between the base 12b and glide sheet 20b . however , if desired , the spacer blocks could be disposed beneath the base 12b . the spacer blocks 56 , 58 and 60 are held against movement relative to the base 12b by the clamps which connect the bumpers 14b with the base 12b . thus , the edge portions of the spacer blocks 56 and 60 are compressed between the bumpers 14b and the base 12b to securely connect the bumpers 14b with the base 12b and to hold the support blocks 56 and 60 against sidewise movement under the influence of forces applied against the glide sheet 20b by the skater . when the skater has finished using the exercise apparatus 10b , the clamp assemblies for the bumpers 14b are loosened and the plastic glide sheet 20b is removed from between the bumpers 14b and the spacer blocks 56 and 60 . the base 12b is then folded at the hinges 18b . the spacer blocks 56 , 58 and 60 are connected with the boards 16b and can be folded with the boards . however , if desired , the spacer blocks 56 , 58 and 60 could be disconnected from the boards . it is clear from the foregoing description that the present invention provides a simple universal exercising apparatus 10 for skaters or other athletes which is simple , lightweight , easy to transport and store and , also , permits the skater not to remain on the same spot . the apparatus 10 can be very quickly assembled and disassembled and occupies little space . to assemble the apparatus 10 , it is sufficient to unfold a stack of hinged boards 16 , unroll the gliding sheet 20 and fix the bumpers , gliding sheet and board platform together . a skater or skier then can put socks on his or her legs and exercise . while the invention has been described herein in terms of the preferred embodiment , numerous variations may be made in the apparatus illustrated in the drawings and herein described without departing from the spirit and scope of the invention set forth in the appended claims .
an exercising apparatus for a speed skater or similar athlete including a base having a plurality of board members arranged in side - by - side relationship . hinges pivotally connect adjacent board members to each other . a flexible plastic sheet overlays the board members and has a smooth glide surface on which the skater can slide . bumpers are located at opposite ends of the base . clamps releasably interconnect the base , the sheet , and the bumpers .