fig1 shows a sharpener for the steel edges of skis according to the invention . in this embodiment , a holder 1 is provided , on which a cutting plate 2 and a guide pin 3 are mounted . holder 1 is made circularly cylindrical and is provided with a support bead 5 around its circumference . cutting plate 2 , preferably made in the form of a rotating plate , has one cutting edge 10 approximately perpendicular to the surface of holder 1 and is held in place by means of a clamp . a clamping cover 6 is fastened to holder 1 by a threaded bolt 8 which fits into a blind hole 7 with an internal thread . cutting plate 2 consists of wear - resistant cutting material , preferably cutting alloy . guide pin 3 is mounted in a blind hole 9 of holder 1 by a press fit and preferably consists of a hardened adapter pin . cutting plate 2 is mounted in such manner that its central plane forms an angle of less than 90 ° with a line 11 formed by its cutting edge 10 and the lower edge of guide pin 3 . line 11 therefore corresponds to the steel edge of a ski to be sharpened . as best shown in fig3 a cover 4 is provided which is preferably made in the shape of a box or a hollow cylinder . cover 4 can be adjusted on holder 1 in such manner that in one position , as shown in cross section in fig3 it covers cutting plate 2 and guide pin 3 , or , as shown by the dot - dash line , it serves as a handle when using the sharpener . the circumferential bead 5 serves as a support for cover 4 . holder 1 and cover 4 are preferably made from impact - resistant plastic . as shown by the dashed lines in fig1 blind holes 7 and 9 are provided on holder 1 to accept threaded bolt 8 and guide pin 3 . the blind holes can be provided with reinforcing ribs 12 for reinforcement . to use the device , after adjusting cover 4 , the sharpener is placed on the steel edge , corresponding to line 11 , contacting it with the lower edge of guide pin 3 and the cutting edge 10 of cutting plate 2 . by smoothly sliding the device along the length of each steel edge in the direction of arrow 13 , the steel edge is sharpened by cutting edge 10 . by making a simple adjustment , the surface of the steel edge of the ski , displaced by 90 °, can be sharpened in similar fashion . if a known rotating plate is used as cutting plate 2 , the user can employ another of the four cutting edges of cutting plate 2 by loosening threaded bolt 8 and rotating cutting plate 2 . when all four cutting edges have been used , cutting plate 2 can be simply resharpened in known fashion . fig4 shows another preferred embodiment of a sharpener for the steel edges of skis according to the invention . in this embodiment , a holder 21 is provided , with a cutting plate 22 and a guide pin 23 . holder 21 in this embodiment is made in the form of a circular cylinder , but can also be made oval or angular . it is provided with a circumferential bead 25 around its edge . cutting plate 22 , preferably made in the form of a rotating plate , has two cutting edges approximately perpendicular to the surface of holder 21 , as best seen in fig4 and 5 . it is held in place by a clamping and supporting plate 27 and a backing plate 30 inside holder 21 . clamping plate 27 and backing plate 30 are connected by means of hex cap bolts 28 and 29 . a roller 24 is mounted centrally in holder 21 as a guide element . this roller 24 is fastened in a central portion 39 of holder 21 by a holder 26 . cutting element 22 is advantageously provided with bevels 31 and 32 , as best shown in fig7 in order to produce spiral chips when used . grooves 33 and 34 are advantageously provided on clamping plate 27 opposite these bevels 31 and 32 to allow the chips to escape . instead of central guide roller 24 , a guide rib 35 can be provided as shown by the dot - dash line in fig4 which rib serves to support the device on the edge of the ski . in a further modification , two symmetrically located guide ribs 35 and 36 can be provided . a hex wrench 40 is attached to the inside of holder 21 in an advantageous fashion to central part 39 , as shown in fig5 . for this purpose , a groove 38 in central part 39 as well as a clamp 37 attached by means of a bolt 41 are used . it is also evident from fig5 that at least one spare cutting plate 47 is provided inside holder 21 . it can be held in place by means of a clamp , a bolt , or another suitable device . fig6 is an end view of the embodiment according to fig4 . according to a further embodiment , locking studs 42 and 43 are provided on the circumference of supporting part 44 , which fit into bilaterally acting bayonet locking openings 46 in a cover 45 , shown only partially in fig6 . according to a modification of the invention , edge part 44 can be made sufficiently wide that it can be used as a handle without cover part 45 . fig7 shows a cutting plate 22 alone . the two bevels 31 and 32 are clearly visible . the invention is not limited to the preferred embodiments shown and described . for example , holder 1 can also be made rectangular , oval , or the like , but the circular or box - shaped design considerably simplifies manufacture by the injection molding method . instead of the circumferential support bead 5 , supporting lugs or the like can be provided . the holder according to the invention , and the cover part if required , are preferably made of impact - resistant and weather - resistant plastic , but can also be made of sheet metal , aluminum , or another appropriate material . it is particularly important that the device operate reliably even at low temperatures . preferably the device is made of low - pressure polyethylene . the invention includes all modifications and improvements made by experts , as well as partial and subcombinations of the features and measures described and / or shown .
a sharpener for steel edges of skis comprises a compact , inexpensive , portable holder containing a cutting plate and a guide pin . the cover for the holder can be positioned to serve as a handle . the cutting plate preferably forms an angle of less than 90 ° with the steel edge of the ski to be sharpened .