EP0128430A2 - Ice skate sharpening machine - Google Patents
Ice skate sharpening machine Download PDFInfo
- Publication number
- EP0128430A2 EP0128430A2 EP84105970A EP84105970A EP0128430A2 EP 0128430 A2 EP0128430 A2 EP 0128430A2 EP 84105970 A EP84105970 A EP 84105970A EP 84105970 A EP84105970 A EP 84105970A EP 0128430 A2 EP0128430 A2 EP 0128430A2
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- EP
- European Patent Office
- Prior art keywords
- blade
- wheel
- skate
- edge
- machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
- A63C3/00—Accessories for skates
- A63C3/10—Auxiliary devices for sharpening blades
Definitions
- the present invention relates to a machine for sharpening the blades of ice skates.
- the present invention has the general objective of providing improvements in this class of machine and, in particular, seeks an improvement in the uniformity of grinding along the length of the blade.
- the depth of metal to be removed from the blade will vary, e.g. from about 2 thousandths of an inch, in the case of a blade requiring only minor sharpening, up to about 10 thousandths of an inch in the case of a badly deteriorated blade.
- a skate blade is initially constructed with a convex profile when seen in side view. In the longitudinally central portion of the blade this convexity is comparatively slight. At the ends, the curvatures are sharper, especially at the toe. This profile is designed to maximise the performance of the skate and it is therefore desirable to maintain such profile throughout the life of the blade. Removal of excessive metal from either or both of the toe and heel portions will distort this profile and shorten the life of the skate.
- the inventive concept in its broadest scope, provides for effecting relative movement of the blade and the wheel in an arc that is curved in the same direction as the profile of the blade edge.
- the wheel is mounted in a vertical plane at a fixed location in the machine and the skate is mounted blade down in a cradle assembly that is located above the wheel, the central longitudinal plane of the blade being coplanar with the central plane of the wheel.
- the cradle assembly is pivotable about an axis that extends parallel to the axis of the wheel at an upper location in the machine. Hence both the blade profile and the traversing arc of the blade over the wheel are curved in the same direction, i.e. convexly downwardly.
- the axis of the pivotted cradle assembly can be located to compensate reasonably well for the comparatively gentle and substantially circular curvature of the central portion of the blade profile. However, it can at the same time compensate only partially for the more sharply curved end portions.
- a further feature of the machine disclosed herein relates to a system for obtaining additional compensation for the "end effect.”
- This result is achieved by increasing the speed of relative movement between the blade and the wheel when grinding the end portions of the blade.
- the depth of cut taken by the wheel is related not only to the strength of the biassing force and its direction relative to the normal to the blade edge at the point of contact, but also to the length of time that the wheel remains in contact with each part of the blade. In other words, other factors being equal, a grinding wheel that passes quickly over a workpiece will take a shallower cut than one that passes more slowly.
- This effect is exploited in the present machine by arranging for the relative motion, e.g. travel of the cradle assembly, to be speeded up when the end portions of the blades are in contact with the wheel.
- a further feature of the machine consists of providing means for accurately sensing the location of the point of contact between the wheel and the blade edge and for regulating the relative movement between them to take place at a high speed when this point is at one end, at a series of incrementally reduced speeds as the point travels towards a central portion of the blade and at a low speed as the point moves along this central portion. Preferably the speed is then again increased through a series of increments as the contact point travels from the central portion to the other end of the blade.
- the incremental reductions and subsequent increases in the speed of traverse can be applied to either one or both passes, e.g. an outward pass in which the blade moves over the wheel from the toe end to the heel end or a return pass when its direction of travel is reversed.
- FIG. 2 The details of the cradle assembly 10 are shown in Figures 2 and 3.
- An upper pivot shaft 101 is journalled in brackets 901 fixed to the frame 90.
- brackets 901 Fixed to the frame 90.
- arms 103 freely mounted by journals 104 on the shaft 101.
- the majority of the length of each of the arms 103 is stiffened by a stiffener 105 which is welded at its ends 106 to the respective arm and is connected thereto at the center by a mounting 107.
- a hydraulic cylinder 108 mounted on the shaft 101 by a journal 109 has a piston 110 that is pivoted at 111 to pairs of transverse links 112 that are pivoted at 113 to the mountings 107.
- Downward movement of the piston 110 by the cylinder 108 moves the links 112 to the broken line positions shown in Figure 2, drawing the arms 103 inwardly towards each other.
- the stiffeners 105 the effect of this inward movement is to flex the arms 103 about their unstiffened upper portions 103a and force the lower ends 114 of the arms towards each other.
- These lower ends 114 carry clamping plates 115 that act to clamp a skate blade between them in a manner and for a purpose that will appear more clearly below.
- the skate detector 20 is mounted beneath the clamping plates 115, as shown in Figures 2 and 3. Details of the skate detector 20 are better seen from Figures 4a and 4b.
- This detector consists of a plate 201 having ends bent up to form upstanding skate supports 202 each containing a centrally located, blade centering groove 203. Centrally of the plate 201 there is a body 204 on the upper surface of which there is a magnet 205. A portion 206 of this central body 204 projecting below the plate 201 contains a known type of detecting mechanism 737, e.g. a lamp and photocell device. A pair of pins 208 project upwardly through holes in the plate 201 in alignment with the grooves 203.
- the pins 208 are mounted on the arms of a U-shaped member 209, the central portion of which is spring urged upwardly and passes through the detecting mechanism 737. As shown by broken lines in Figure 4a, when both the pins 208 are depressed, the central portion of the member 209 moves to a lower position relative to the mechanism 737. The depressed position of the member 209 is thus detected by the mechanism 737.
- any other convenient detecting mechanism can be used that will confirm that a skate blade is in position between the clamping plates 115, e.g. a pair of spaced apart photosensors that directly sense front and rear parts of the blade without the intermediary of the pins 208 and member 209.
- the skate detector 20 is located beneath the clamping plates 115 of the cradle assembly 10 in such a manner as to be movable between a raised and a lowered position.
- it is mounted on an arm 212 that is freely pivoted to the frame at 902. Shown in these views in its lowered position, the detector 20 can be raised by a vertical member 211 secured to it.
- the member 211 carries a horizontal pin 210 that is controlled by parts of the door moving system 80 in the manner described below.
- This assembly 30 is secured to the far side of the cradle assembly 10 as seen in Figure 1, for which reason it is largely obscured in that figure. However a fragment of the frame 301 of the assembly 30 is shown in Figure 2 to make it clear that the assemblies 10 and 30 swing together on the shaft 101.
- the frame 301 supports a motor 303 that, through a chain 304, drives a threaded shaft 305 mounted in bearings 306 in a central housing.
- the shaft 305 has two ends that project in respective directions from the bearing housing, these ends being respectively provided with right and left hand threads.
- the carriages 307, 308 respectively carry laterally projecting arms 309, 310 (see also Figure 9) that extend towards the cradle assembly. On the ends of these arms 309, 310 there are respectively an upwardly projecting toe stop 311 and a downwardly projecting heel stop 312 (also seen in Figure 1).
- the grinding assembly 40 which is shown in detail in Figures 10, 11 and 12 and in location in the machine in Figure 1, has a fixed housing 401 mounted in the frame 90.
- the housing 401 pivotally supports a projecting shaft 402 and, as seen in Figures 1 and 10, contains an electromagnetic brake 403 mounted on the inner end of the shaft 402.
- On its projecting end the shaft 402 is connected to a frame 404 which is thus tiltable with the shaft about its longitudinal axis.
- the frame 404 supports a motor 405 that drives through a belt 406 to one end of a shaft 407 that is journalled at 408 on the other side of the frame 404.
- the other end of the shaft 407 supports a grinding wheel 409 that projects through a slot 904 of a frame plate 903 ( Figure 10).
- a conventional wheel dressing assembly has an arm 410 operated by a crank 411 from an auxiliary motor 413 ( Figure 1) in the housing 401.
- the arm 410 carries a head 412 for oscillation in an arc across the face of the grinding wheel 409 for cleaning and dressing the same with the desired convex shape. Since this dressing assembly is known, no further details need discussion.
- the cradle drive mechanism 50 is principally shown in Figure 13 and will be seen to consist of a block 501 that is connected to the cradle assembly 10 at a lower end thereof (see also Figures 1, 2 and 3 for this detail).
- a cable 502 extends in both directions from the block 501. Starting from the block 501 a part of the cable 502 extends to the left in a generally horizontal direction to pass over a vertical pulley 503 from where it extends downwardly to pass around a further vertical pulley 504, the shaft of which is supported in a journal 505 connected to a bolt 506 that is spring urged downwardly by a spring 507 relative to a fixed stop 910 of the frame 90.
- the spring 507 thus serves to maintain tension in the cable 502.
- the cable continues over further vertical pulleys 508, 509 and 510 and over one pulley 511 of a pulley block 512.
- the pulley 511 it extends to an anchor 911 on the frame.
- the cable 502 passes over a pulley 513 and a second pulley 514 of the block 512 to an anchor 912.
- the block 512 which mounts the pulleys 511 and 514 is connected to a piston 516 of a cylinder 515 secured to a frame bracket 913 ( Figure 1). With the pulley block 512 in the upper position shown in Figures 1 and 13, the cradle assembly 10 is in its starting position.
- the cradle assembly 10 is swung to the right in accordance with the operating sequence described below. Reverse travel of the cradle assembly is achieved by retraction of the piston 516 and consequent raising of the pulley block 512.
- the cradle position detection system 60 shown in Figures 6, 9 and 15 consists of a pair of plates 601, 602 secured to respective carriages 307, 308 of the skate positioning assembly 30 by mountings 605, 606.
- the plates 601, 602 are each notched to form fingers or flags 603.
- mounted on the frame at 920 is a bificated post 608 through which the flags 603 of the plates 601, 602 pass when the cradle assembly 10 is swung from its start position of Figures 1, 3 and 9.
- the post 608 carries a known light and photocell device that detects passage therethrough of each of the edges, leading and trailing, of each of the flags 603. This function is more fully described below in connection with the overall operation of the machine.
- FIG 17 shows the hydraulic circuit of the control system. Fluid is drawn by a pump 701 from a reservoir 702 and supplied under pressure to each of three reversible direction valves 703, 704 and 705 that respectively supply the clamping cylinder 108, a door cylinder 801 and the cradle cylinder 515. In the forward positions of the valves shown, these cylinders are driven in their forward directions. To reverse their movements, the respective valves are moved upwardly to their reverse positions. On the discharge side, each of the valves 703, 704 and 705 passes fluid to a respective bypass valve 706, 707 and 708, whereby such fluid is returned to the reservoir 702. A general pressure release valve 709 maintains the desired pressure on the pressure side of the pump 701.
- a flow control assembly 710 is connected between the reservoir 702 and the discharge side of the valve 705 controlling the cradle cylinder 515. The function of this assembly 710 is described in more detail below.
- the control system 70 also includes a number of limit switches, namely a limit switch 730 ( Figure 3) mounted on a frame member 950 for detecting that the cradle assembly 10 is in its start position; a limit switch 731 ( Figures 3 and 16) mounted on a frame member 951 for detecting the condition of the door closing system 80; a limit switch 732 ( Figures 1 and 3) mounted on the frame 90 for determining the pressure in the valve 703 and hence in the cradle cylinder 108; and a limit switch 734 ( Figure 10) mounted in the housing 401 for determining the status of the grinding wheel dressing device.
- a limit switch 730 Figure 3
- a limit switch 731 Figures 3 and 16
- a limit switch 732 Figures 1 and 3
- a limit switch 734 ( Figure 10) mounted in the housing 401 for determining the status of the grinding wheel dressing device.
- the door moving system 80 ( Figures 1 and 16), employs a cylinder 801 pivotally mounted on the frame at 930 and having a piston 802 connected to an arm 803 at a pivot 804.
- the arm 803 is connected to a transverse shaft 805 mounted on the frame at 931.
- the shaft 805 serves to turn a pair of arms 806, one of which is located on each side of the machine as best seen in Figure 1.
- Each arm 806 supports at its free end a further arm 807 that has a longitudinal slot 808. This slot engages a pin 809 of a block 810 that is pivotally mounted on a pin 816 secured to an arm 811.
- the block 810 terminates in a hooked portion 812 and is urged by a spring 815 to engage an upper end 814 of a vertical member 813.
- the arm 811 supports a door (not shown) that is mounted to slide to open and close an opening 907 at the front of the housing. Behind the opening 907 there is an enclosure 906 (shown partly cut away in Figure 1) designed to protect the hand of a user when he is inserting a skate 8 into the machine.
- a member 820 (see also Figure 3) that can turn with the arm 811 about a pivoted mounting 932 on the frame.
- the lower end of the arm 820 is pivotally connected at 822 to a horizontal link 821 that at its far end is pivoted at 823 to a link 824 (see also Figure 2) that in turn is connected to an arm 825 that extends laterally beneath the cradle assembly 10, terminating in a arm 826 that engages the pin 210 of the device 20 for moving it between the lower position shown in Figure 3 and a raised position (not shown) in which it will have been turned somewhat anti-clockwise about the pivot 902 to lie more closely beneath the clamping plates 115 with its magnet 205 parallel to and centred on the gap between the clamping plates 115.
- Figure 1 also shows a tank 935 at the foot of the frame 90 for containing coolant that is sprayed onto the grinding wheel in a known manner (not otherwise described or illustrated) and a control panel 936 for operation by the user.
- the housing will be completed by a door on the near side seen in Figure 1, which door can conveniently serve to support a microcomputer assembly (not shown) that will form part of the control system 70, and may also include a conventional coin operated mechanism (not shown) for energising the machine.
- Figure 15 shows the blade 9 and the grinding wheel 409 as seen from the far side of the machine.
- the broken vertical lines indicate the relationship between points Pl to P18 on the blade 9 and edges El to E18 of the flags 603 that trigger signals in the photo sensor in the post 608. It is not necessary that the extreme toe end Pl of the blade 9 be physically aligned in the machine with the edge El. All that is necessary is that the post 608 be so positioned that, when the centre of the wheel is directly below the point Pl, the edge El is aligned with the beam in the post 608 to generate an appropriate signal. However, for convenience in the diagram of Figure 15, actual alignment has been shown.
- the first outward pass P0 with the direction of movement of the cradle assembly from right to left, is shown at the bottom of Figure 15.
- the machine now repeats the same sequence of steps either once or twice. Once these repeat passes have been made, or if only one double pass was selected (light grind), the computer now stops the grinder motor 405 and allows the cradle cylinder 515 to continue to move the cradle assembly 10 until its attainment of its start position has been confirmed by the limit switch 730. The coolant flow is stopped when the grinding wheel stops.
- the computer reactivates the door opening cylinder 801. As the door is opened the skate detector 20 is again brought up to sense the presence of the skate. The computer then reverses the clamping cylinder 108 to release the blade 9 from the plates 115 and to enable the operator to remove the sharpened skate.
- the operation can be so modified that the incremental changes in the traversing speeds from S8 down to Sl and up again to S7, the example for the outward pass PO given in Figure 15, is different for the return pass PR.
- a constant speed can be adopted throughout, or fewer increments can be used, say speed S2 between edges E18 and Ell and between edges E10 and El and speed Sl between edges Ell and E10.
- the return pass can retain the numerous increments of speed, while the outward pass is simplified.
- the speed or speeds adopted on the return pass will have to be taken into account in selecting the values chosen for the varying speeds on the outward pass, and vice versa.
- the system is thus especially well adapted to modification to accommodate different blade profiles.
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- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
- The present invention relates to a machine for sharpening the blades of ice skates.
- As is well known, the bottom edge of an ice skate blade is required to have a somewhat concave transverse cross-section so that a sharp ridge extends along each of the two side edges. This shape is maintained by grinding the blade periodically with a grinding wheel, the periphery of which has a corresponding convex shape in transverse cross-section. A typical machine for this purpose has been disclosed, for example, in United States patent 3,735,533 issued May 29, 1973 to M. Salberg (Canadian patent 920,819 dated February 13, 1973).
- The present invention has the general objective of providing improvements in this class of machine and, in particular, seeks an improvement in the uniformity of grinding along the length of the blade. The depth of metal to be removed from the blade will vary, e.g. from about 2 thousandths of an inch, in the case of a blade requiring only minor sharpening, up to about 10 thousandths of an inch in the case of a badly deteriorated blade. Whatever the depth of cut that is selected, it is important that essentially the same depth of cut be maintained along the full length of the blade. If a reasonable approximation to this ideal is not maintained, after repeated sharpening operations the basic profile of the blade will become significantly modified.
- One of the principal difficulties with prior machines of this type has been a tendency for them to remove more metal from the ends of the blade, i.e. near the toe and the heel, than from the central portion of the blade, during each pass of the grinding wheel along the blade. A skate blade is initially constructed with a convex profile when seen in side view. In the longitudinally central portion of the blade this convexity is comparatively slight. At the ends, the curvatures are sharper, especially at the toe. This profile is designed to maximise the performance of the skate and it is therefore desirable to maintain such profile throughout the life of the blade. Removal of excessive metal from either or both of the toe and heel portions will distort this profile and shorten the life of the skate.
- The tendency towards removal of more metal from the end portions than from the center, flows from the fact that, when a grinding wheel is urged against a skate blade in a direction perpendicular to the general longitudinal direction of the blade and the portion of the blade engaged by the wheel does not extend at right angles to such perpendicular direction due to the curvature of the blade, such portion contacts the wheel at a radius inclined to such perpendicular direction. Thus, if a uniform force is applied to bias the wheel in the perpendicular direction throughout a complete pass of the wheel along the blade, the blade resists this applied force by a somewhat larger force acting along the inclined radius, since the action and reaction forces between the blade and the wheel can only act along a radius normal to the tangential direction of the contact between the blade and the wheel.
- A proposal to compensate for this effective increase of force between the blade and the wheel (and hence increased depth of cut) at the ends of the blade by varying the perpendicular biassing force in accordance with the grinding resistance (sensed by measuring the power input to the motor driving the wheel), is disclosed in United States patent 4,235,050 issued November 25, 1980 to J.H. Hannaford et al. (Canadian patent 1,118,514 issued February 16, 1982). This proposed solution has, however, not been found reliable or satisfactory in practice.
- It is the principal objective of the present invention to provide an alternative solution to the problem of ensuring substantial uniformity of depth of cut throughout the length of the blade, especially the "end effect" problem, by a system that is both simple in construction and more accurate and reliable in practice than any machine hitherto constructed.
- To this end, the inventive concept, in its broadest scope, provides for effecting relative movement of the blade and the wheel in an arc that is curved in the same direction as the profile of the blade edge.
- In a preferred form of the invention, the wheel is mounted in a vertical plane at a fixed location in the machine and the skate is mounted blade down in a cradle assembly that is located above the wheel, the central longitudinal plane of the blade being coplanar with the central plane of the wheel. The cradle assembly is pivotable about an axis that extends parallel to the axis of the wheel at an upper location in the machine. Hence both the blade profile and the traversing arc of the blade over the wheel are curved in the same direction, i.e. convexly downwardly. If the curved profile of the blade edge were a simple circular arc, it would be possible to compensate fully for such curvature, and especially for the "end effect," by locating the cradle assembly axis coincident with the center of curvature of the blade profile. However, only the central part of the blade profile is even approximately circular. As already mentioned, towards the ends the blade curves up relatively sharply, such curvature being different at the heel portion from the toe portion. In addition, a figure skate has a differently shaped toe portion from that of a hockey skate, and it is desirable that the same machine should be able to sharpen both types of skate. Hence, as a practical matter, the axis of the pivotted cradle assembly can be located to compensate reasonably well for the comparatively gentle and substantially circular curvature of the central portion of the blade profile. However, it can at the same time compensate only partially for the more sharply curved end portions.
- For this reason, a further feature of the machine disclosed herein relates to a system for obtaining additional compensation for the "end effect." This result is achieved by increasing the speed of relative movement between the blade and the wheel when grinding the end portions of the blade. The depth of cut taken by the wheel is related not only to the strength of the biassing force and its direction relative to the normal to the blade edge at the point of contact, but also to the length of time that the wheel remains in contact with each part of the blade. In other words, other factors being equal, a grinding wheel that passes quickly over a workpiece will take a shallower cut than one that passes more slowly. This effect is exploited in the present machine by arranging for the relative motion, e.g. travel of the cradle assembly, to be speeded up when the end portions of the blades are in contact with the wheel.
- A further feature of the machine.consists of providing means for accurately sensing the location of the point of contact between the wheel and the blade edge and for regulating the relative movement between them to take place at a high speed when this point is at one end, at a series of incrementally reduced speeds as the point travels towards a central portion of the blade and at a low speed as the point moves along this central portion. Preferably the speed is then again increased through a series of increments as the contact point travels from the central portion to the other end of the blade.
- The incremental reductions and subsequent increases in the speed of traverse can be applied to either one or both passes, e.g. an outward pass in which the blade moves over the wheel from the toe end to the heel end or a return pass when its direction of travel is reversed.
- Other features of the machine are explained below and in the accompanying claims.
- A machine embodying various preferred features of the present invention is illustrated by way of example in the accompanying drawings, in which:
-
- Figure 1 is a perspective, overall view of the machine with the near side door of the housing removed;
- Figure 2 is a view of a cradle assembly and some related parts, as seen from the right hand side of Figure 3;
- Figure 3 is a side view of the cradle assembly and some related parts as seen from the left hand side of Figure 2;
- Figure 4a is a side view of a skate detector, as seen from below in Figure 4b;
- Figure 4b is a view as seen from the top of Figure 4a;
- Figure 5 is an end view of a skate positioning assembly;
- Figure 6 is a view as seen from the left of Figure 5;
- Figure 7 is a fragmentary view showing a skate initially placed on the cradle assembly;
- Figure 8 is a view similar to Figure 7 at a later stage in the operation;
- Figure 9 is a diagrammatic perspective view of part of the skate positioning assembly together with a cradle position detection system as seen from the far side of the machine;
- Figure 10 is a side view of a grinding assembly, looking horizontally, and with some parts cut away;
- Figure 11 is a plan view as seen from the top of Figure 10, and with some parts omitted;
- Figure 12 is a perspective view of the grinding assembly illustrating its operation;
- Figure 13 (on the sheet with Figures 4a and 4b) is a diagrammatic perspective view of a cradle drive mechanism;
- Figure 14 (on the sheet with Figures 7 to 9) is a fragmentary perspective view showing a stage in the operation in the machine;
- Figure 15 is a diagram illustrating the manner of operation of the cradle position detection system;
- Figure 16 is a fragmentary view illustrating part of a door closing system; and
- Figure 17 is a diagram of part of a control system.
- For convenience the machine has been illustrated and will be described as a series of sub-systems, as follows:
- (a) A
cradle assembly 10, the parts of which are identified by reference numerals beginning 100. - (b) A
skate detector 20, the parts of which are identified by reference numerals beginning 200. - (c) A
skate positioning assembly 30, the parts of which are identified by reference numerals beginning 300. - (d) A grinding
assembly 40, the parts of which are identified by reference numerals beginning 400. - (e) A
cradle drive mechanism 50, the parts of which are identified by reference numerals beginning 500. - (f) A cradle position detection system 60, the parts of which are identified by reference numerals beginning 600.
- (g) A
control system 70, the parts of which are identified by reference numerals beginning 700. - (h) A
door moving system 80, the parts of which are identified by reference numerals beginning 800. - (i) A
housing frame 90, the parts of which are identified by reference numerals beginning 900. - The details of the
cradle assembly 10 are shown in Figures 2 and 3. An upper pivot shaft 101 is journalled inbrackets 901 fixed to theframe 90. Depending from the shaft 101 are fourarms 103 freely mounted byjournals 104 on the shaft 101. The majority of the length of each of thearms 103 is stiffened by astiffener 105 which is welded at itsends 106 to the respective arm and is connected thereto at the center by a mounting 107. - A
hydraulic cylinder 108 mounted on the shaft 101 by ajournal 109 has apiston 110 that is pivoted at 111 to pairs oftransverse links 112 that are pivoted at 113 to themountings 107. Downward movement of thepiston 110 by thecylinder 108 moves thelinks 112 to the broken line positions shown in Figure 2, drawing thearms 103 inwardly towards each other. By virtue of thestiffeners 105 the effect of this inward movement is to flex thearms 103 about their unstiffened upper portions 103a and force the lower ends 114 of the arms towards each other. These lower ends 114 carry clampingplates 115 that act to clamp a skate blade between them in a manner and for a purpose that will appear more clearly below. It should however be noted that, by virtue of the fact that the skate blade is clamped by a pair of plates that move in unison towards each other, the central longitudinal plane of the clamped blade will always lie in a predetermined plane regardless of the thickness of the blade. In this connection, it should be noted that figure skate blades are generally thicker than those of hockey skates. Moreover, even within one of these types of blade there can be thickness variations among manufacturers. This predetermined central plane of clamping is, of course, arranged to coincide with the central plane of the grinding wheel, so that the peak of the convexity on the wheel will always be aligned with the peak of the concavity in the blade. - It should also be noted that the inward force exerted by the clamping
plates 115 is made sufficiently great and these plates are dimensioned to engage a sufficient length of a blade 9 (Figure 7) that any initial lack of straightness in the blade will be eliminated by the clamping action. Such straightening action thus serves to ensure the desired coincidence of the central plane of the grinding wheel with the central longitudinal plane of the blade throughout its entire length. - The
skate detector 20 is mounted beneath the clampingplates 115, as shown in Figures 2 and 3. Details of theskate detector 20 are better seen from Figures 4a and 4b. This detector consists of aplate 201 having ends bent up to form upstanding skate supports 202 each containing a centrally located,blade centering groove 203. Centrally of theplate 201 there is abody 204 on the upper surface of which there is amagnet 205. Aportion 206 of thiscentral body 204 projecting below theplate 201 contains a known type of detectingmechanism 737, e.g. a lamp and photocell device. A pair ofpins 208 project upwardly through holes in theplate 201 in alignment with thegrooves 203. Thepins 208 are mounted on the arms of aU-shaped member 209, the central portion of which is spring urged upwardly and passes through the detectingmechanism 737. As shown by broken lines in Figure 4a, when both thepins 208 are depressed, the central portion of themember 209 moves to a lower position relative to themechanism 737. The depressed position of themember 209 is thus detected by themechanism 737. - Alternatively, any other convenient detecting mechanism can be used that will confirm that a skate blade is in position between the clamping
plates 115, e.g. a pair of spaced apart photosensors that directly sense front and rear parts of the blade without the intermediary of thepins 208 andmember 209. - As shown in Figures 2 and 3, the
skate detector 20 is located beneath the clampingplates 115 of thecradle assembly 10 in such a manner as to be movable between a raised and a lowered position. For this purpose, it is mounted on anarm 212 that is freely pivoted to the frame at 902. Shown in these views in its lowered position, thedetector 20 can be raised by avertical member 211 secured to it. Themember 211 carries ahorizontal pin 210 that is controlled by parts of thedoor moving system 80 in the manner described below. - This
assembly 30 is secured to the far side of thecradle assembly 10 as seen in Figure 1, for which reason it is largely obscured in that figure. However a fragment of theframe 301 of theassembly 30 is shown in Figure 2 to make it clear that theassemblies - Details of the skate positioning assembly itself are shown in Figures 5 and 6, where it will be seen that the
frame 301 supports amotor 303 that, through achain 304, drives a threadedshaft 305 mounted inbearings 306 in a central housing. As will be apparent from Figure 6, theshaft 305 has two ends that project in respective directions from the bearing housing, these ends being respectively provided with right and left hand threads. On the left hand end of theshaft 305 there is atoe carriage 307 and on the right hand end aheel carriage 308. Rotation of theshaft 305 by themotor 303 will move thesecarriages carriages arms 309, 310 (see also Figure 9) that extend towards the cradle assembly. On the ends of thesearms toe stop 311 and a downwardly projecting heel stop 312 (also seen in Figure 1). - The grinding
assembly 40, which is shown in detail in Figures 10, 11 and 12 and in location in the machine in Figure 1, has a fixedhousing 401 mounted in theframe 90. Thehousing 401 pivotally supports a projectingshaft 402 and, as seen in Figures 1 and 10, contains anelectromagnetic brake 403 mounted on the inner end of theshaft 402. On its projecting end theshaft 402 is connected to aframe 404 which is thus tiltable with the shaft about its longitudinal axis. On one side theframe 404 supports amotor 405 that drives through abelt 406 to one end of ashaft 407 that is journalled at 408 on the other side of theframe 404. The other end of theshaft 407 supports agrinding wheel 409 that projects through aslot 904 of a frame plate 903 (Figure 10). A conventional wheel dressing assembly has anarm 410 operated by acrank 411 from an auxiliary motor 413 (Figure 1) in thehousing 401. Thearm 410 carries ahead 412 for oscillation in an arc across the face of thegrinding wheel 409 for cleaning and dressing the same with the desired convex shape. Since this dressing assembly is known, no further details need discussion. - The
cradle drive mechanism 50 is principally shown in Figure 13 and will be seen to consist of ablock 501 that is connected to thecradle assembly 10 at a lower end thereof (see also Figures 1, 2 and 3 for this detail). Acable 502 extends in both directions from theblock 501. Starting from the block 501 a part of thecable 502 extends to the left in a generally horizontal direction to pass over avertical pulley 503 from where it extends downwardly to pass around a further vertical pulley 504, the shaft of which is supported in ajournal 505 connected to abolt 506 that is spring urged downwardly by aspring 507 relative to afixed stop 910 of theframe 90. Thespring 507 thus serves to maintain tension in thecable 502. From the pulley 504, the cable continues over furthervertical pulleys pulley 511 of apulley block 512. After thepulley 511 it extends to ananchor 911 on the frame. Extending in the other direction from theblock 501, thecable 502 passes over apulley 513 and asecond pulley 514 of theblock 512 to ananchor 912. Theblock 512 which mounts thepulleys piston 516 of acylinder 515 secured to a frame bracket 913 (Figure 1). With thepulley block 512 in the upper position shown in Figures 1 and 13, thecradle assembly 10 is in its starting position. As thecylinder 515 is expanded to force theblock 512 downwardly, thecradle assembly 10 is swung to the right in accordance with the operating sequence described below. Reverse travel of the cradle assembly is achieved by retraction of thepiston 516 and consequent raising of thepulley block 512. - The cradle position detection system 60 shown in Figures 6, 9 and 15 consists of a pair of
plates respective carriages skate positioning assembly 30 bymountings plates bificated post 608 through which theflags 603 of theplates cradle assembly 10 is swung from its start position of Figures 1, 3 and 9. Thepost 608 carries a known light and photocell device that detects passage therethrough of each of the edges, leading and trailing, of each of theflags 603. This function is more fully described below in connection with the overall operation of the machine. - Figure 17 shows the hydraulic circuit of the control system. Fluid is drawn by a
pump 701 from areservoir 702 and supplied under pressure to each of threereversible direction valves clamping cylinder 108, adoor cylinder 801 and thecradle cylinder 515. In the forward positions of the valves shown, these cylinders are driven in their forward directions. To reverse their movements, the respective valves are moved upwardly to their reverse positions. On the discharge side, each of thevalves respective bypass valve reservoir 702. A generalpressure release valve 709 maintains the desired pressure on the pressure side of thepump 701. In addition aflow control assembly 710 is connected between thereservoir 702 and the discharge side of thevalve 705 controlling thecradle cylinder 515. The function of thisassembly 710 is described in more detail below. - The
control system 70 also includes a number of limit switches, namely a limit switch 730 (Figure 3) mounted on aframe member 950 for detecting that thecradle assembly 10 is in its start position; a limit switch 731 (Figures 3 and 16) mounted on aframe member 951 for detecting the condition of thedoor closing system 80; a limit switch 732 (Figures 1 and 3) mounted on theframe 90 for determining the pressure in thevalve 703 and hence in thecradle cylinder 108; and a limit switch 734 (Figure 10) mounted in thehousing 401 for determining the status of the grinding wheel dressing device. - The door moving system 80 (Figures 1 and 16), employs a
cylinder 801 pivotally mounted on the frame at 930 and having apiston 802 connected to anarm 803 at a pivot 804. Thearm 803 is connected to atransverse shaft 805 mounted on the frame at 931. Theshaft 805 serves to turn a pair ofarms 806, one of which is located on each side of the machine as best seen in Figure 1. Eacharm 806 supports at its free end afurther arm 807 that has alongitudinal slot 808. This slot engages a pin 809 of ablock 810 that is pivotally mounted on apin 816 secured to anarm 811. Theblock 810 terminates in a hookedportion 812 and is urged by aspring 815 to engage anupper end 814 of avertical member 813. - On the left hand end seen in Figure 16, the
arm 811 supports a door (not shown) that is mounted to slide to open and close anopening 907 at the front of the housing. Behind theopening 907 there is an enclosure 906 (shown partly cut away in Figure 1) designed to protect the hand of a user when he is inserting askate 8 into the machine. - From the other end of one of the arms 811 (right hand end of the near arm) there depends a member 820 (see also Figure 3) that can turn with the
arm 811 about a pivoted mounting 932 on the frame. The lower end of thearm 820 is pivotally connected at 822 to ahorizontal link 821 that at its far end is pivoted at 823 to a link 824 (see also Figure 2) that in turn is connected to anarm 825 that extends laterally beneath thecradle assembly 10, terminating in aarm 826 that engages thepin 210 of thedevice 20 for moving it between the lower position shown in Figure 3 and a raised position (not shown) in which it will have been turned somewhat anti-clockwise about thepivot 902 to lie more closely beneath the clampingplates 115 with itsmagnet 205 parallel to and centred on the gap between the clampingplates 115. - Virtually all the significant parts of the
frame 90 have already been described in relation to their support of the various sub-systems. However, Figure 1 also shows atank 935 at the foot of theframe 90 for containing coolant that is sprayed onto the grinding wheel in a known manner (not otherwise described or illustrated) and acontrol panel 936 for operation by the user. The housing will be completed by a door on the near side seen in Figure 1, which door can conveniently serve to support a microcomputer assembly (not shown) that will form part of thecontrol system 70, and may also include a conventional coin operated mechanism (not shown) for energising the machine. - Assuming that the machine has been turned on, either by a coin operated mechanism or the like, or by a master switch, the following sequence of steps is carried out under the control of the microcomputer.
- (1) The number of passes of the
cradle assembly 10 since thegrinding wheel 409 was last dressed is checked and, if above a selected number, the dressingassembly motor 413 is actuated. When the dressing operation is complete, or was not carried out, the ready status of thewheel 409 is signalled by thelimit switch 734. - (2) Location of the
cradle assembly 10 in its start position is detected by thelimit switch 730. If it is not, thecradle cylinder 515 is retracted to bring it to this start position. - (3) The door to the
opening 907 is opened by thecylinder 801 by moving thevalve 704 to the position opposite to that seen in Figure 17. This action involves thearms 807 pulling up on the pins 809 to rotate theblocks 810 to unlatch thehooked portions arms 811 to rotate upwards about themountings 932. Raising of the door enables the operator to insert askate 8 toe first, as shown in Figure 1. The front face of the housing will contain appropriate instructions for the operator. Opening of the door also raises theskate detector 20 through themembers 820 to 826, 210 and 211. - (4) The
blade 9 of the skate will pass between the clampingplates 115 to engage and be lightly held by themagnet 205 of theskate detector 20, while resting in thegrooves 203 and depressing thepins 208 to activate the detectingmechanism 737 and hence signal the presence of a skate blade to the control system. - (5) The
skate positioning assembly 30 is then actuated,e.g. motor 303, in the direction to move the toe and heel stops 311, 312 towards each other to engage the respective ends of the skate. Compare Figures 7 and 8. The effect of this movement is to ensure centering of the skate blade in the longitudinal direction, regardless of how far forward or rearward it has been inserted by the operator. Firm engage- ment of both ends of the skate by thestops heel carriages - (6) The control system then moves the
valve 703 to the position shown in Figure 17 to energise thecylinder 108 to clamp the blade tightly between theplates 115. Achievement of tight clamping is reflected in a build up of pressure in thecylinder 108, which is detected by thelimit switch 732. Any subsequent loss of such pressure would be detected by theswitch 732 to halt the operation of the machine. Themotor 303 is deenergised but not reversed, so thestops - (7) The door is now closed by returning the
valve 704 to its Figure 17 position to expand thecylinder 801. The downward sliding movement of the door takes place under gravity only, being merely permitted rather than forced by the return movement of themechanism 80, so that the operator is not harmed if his hand is still inserted into theopening 907. He will, of course, have been instructed to remove his hand from the machine as soon as he had inserted the skate in step (3) above, and the sequence of steps will be controlled with appropriate delays to ensure that he has had adequate time for this purpose. In any event, while thecylinder 801 will have been fully expanded to move thearms 807 to the position shown in Figure 16, the pins 809 will only have reached the end of theirslots 808 if thearms 811 have been permitted by a fully closed door to reach the position shown in Figure 16. Until this occurs (indicating that the operator's hand must have been removed from the machine), thelatches cylinder 801. At this time thelimit switch 731 signals that the door is in the closed and latched condition. It also indicates that theskate detector 20 has been allowed to drop clear of the blade by lowering of themember 826. Should themagnet 205 be strong enough to prevent this, the linkage connected to the door moving system that raises thedetector 20 can be modified to lower it positively at this time. - (8) At this or some earlier stage in the operation the operator is invited, e.g. by flashing lights, to press appropriate control buttons on the
panel 936 to indicate the type of skate, i.e. hockey or figure, and the depth of grinding he desires, e.g. light, medium or heavy. If a light grind is chosen, the machine makes one double pass (forward and back) of the skate over the wheel. For the medium and heavy grinds two and three double passes respectively are made. - (H9) Assuming a hockey skate has been inserted into the machine and so indicated on the
panel 936, the control system turns on the supply of coolant to the wheel and starts to move thecradle assembly 10 by means of thevalve 705 and thecradle cylinder 515. The speed of movement of thecylinder 515 and hence the speed of traverse of thecradle assembly 10 is controlled by theflow control assembly 710 in the exhaust flow from the cylinder. In the preferred form of flow control assembly, there is a series of valve controlled orifices that can be selectively opened or closed to enable the computer to select oneof eight different increments of resistance to flow and hence one of eight different traversing speeds for the cradle assemly. Initially, theassembly 710 sets the traversing speed at its minimum value Sl. Figure 15 shows theblade 9 and thegrinding wheel 409 as seen from the far side of the machine. The broken vertical lines indicate the relationship between points Pl to P18 on theblade 9 and edges El to E18 of theflags 603 that trigger signals in the photo sensor in thepost 608. It is not necessary that the extreme toe end Pl of theblade 9 be physically aligned in the machine with the edge El. All that is necessary is that thepost 608 be so positioned that, when the centre of the wheel is directly below the point Pl, the edge El is aligned with the beam in thepost 608 to generate an appropriate signal. However, for convenience in the diagram of Figure 15, actual alignment has been shown. The first outward pass P0, with the direction of movement of the cradle assembly from right to left, is shown at the bottom of Figure 15. - (H10) As soon as the computer detects the first flag edge El, i.e. at time Tl, it starts the
grinder motor 405. Thebrake 403 will already be released, except on subsequent forward passes, in which case it is now released. The weight of themotor 405 and that of any counterweight that is added to themotor 405 are made greater than the combined weights of the parts of theassembly 40 on the other side of the axis of theshaft 402, so that thewheel 409 is biassed upwardly when thebrake 403 is released. There is, however, a stop (not shown) on theshaft 402 limiting eventual upward tilting of theframe 404 to avoid the wheel or its shaft fouling theplate 903. Between points Pl and P2 the wheel is assuming its full rotational speed and hence the traversing speed can be at the minimum value Sl. In any case, exact uniformity in the depth of cut at this extreme end of the blade is less important that in the area beyond point P2. - (Hll) When the computer detects edge E2 at time T2 (corresponding to the
wheel 409 engaging the blade point P2), the traversing speed is increased by theflow control assembly 710 to the maximum value of S8. - (H12) The signal from the edge E3 is not used by the computer which waits for that from the edge E4 which reduces the speed to S7 and, so on, edges E5, E6, E7,E8, E9 and E10 reducing the speed by successive smallincrements to values designated S6, S5, S4, S3, S2 and Sl respectively. The latter speed is reached at time T10 when point P10 on the blade has reached the
wheel 409. Typically the lowest speed Sl could be about half the highest speed S8. - (H13) The pass has now reached the central portion of the blade between points P10 and Pll where no compensation for depth of cut is required beyond that provided by the pivotal mounting of the cradle assembly.
- (H14) When the flag edge Ell is detected a sequence of speed increases commences. As shown in the lower part of Figure 15, edges Ell to E16 initiate speeds S2 to S7 respectively. Speed S8 is not used at the heel end of the blade due to the lesser curvature.
- (H15) At edge E17, i.e. time T17, the computer reapplies the
brake 403 so that the wheel cannot rise any further and the blade loses contact with it shortly after point P17. Point P18 is never in contact with the wheel. At the same time, i.e. time T17, the traversing speed is reduced to Sl. - (H16) When the edge E18 is detected at time T18 the computer commences a time delay Dl after which at time T19 it reverses the direction of the
cradle cylinder 515. The return pass PR is shown in Figure 15 above the outward pass P0. The initial speed on the return pass is S7. - (H17) When the edge E18 is again detected at time T20 the
brake 403 is again released and travel continues at speed S7 until edges E16 to Ell are each detected and used to reduce the speed through successive steps to Sl. - (H18) As on the outward pass, the speed remains low at Sl across the central part of the profile, until edge E10 is again reached. Edges E10 to E4 progressively increase the speed up to S8. Then at edge E2 and time T21 the
brake 403 is again applied. - (H19) At edge El and time T22, # second time delay D2 is commenced before the cradle assembly reaches the start position at time T23.
- (H20) If the operator has selected more than one double pass (medium or heavy grind) the machine now repeats the same sequence of steps either once or twice. Once these repeat passes have been made, or if only one double pass was selected (light grind), the computer now stops the
grinder motor 405 and allows thecradle cylinder 515 to continue to move thecradle assembly 10 until its attainment of its start position has been confirmed by thelimit switch 730. The coolant flow is stopped when the grinding wheel stops. - (H21) The computer then reverses the
skate positioning motor 303 to move thestops - (H22) After the occurrence of this action has been confirmed by the respective limit switches, the computer reactivates the
door opening cylinder 801. As the door is opened theskate detector 20 is again brought up to sense the presence of the skate. The computer then reverses theclamping cylinder 108 to release theblade 9 from theplates 115 and to enable the operator to remove the sharpened skate. - (H23) A short time delay, say three seconds, after the
detector 20 has reported removal of the skate, the computer again closes the door. Closing and latching of the door must be detected by the computer, before a new cycle can be initiated. - (F9) Assume now that a figure skate has been inserted into the machine and so indicated on the
panel 936. The toe portion of a figure skate has picks that could be damaged by thewheel 409 if it were rotating. These picks are in the area defined between the points Pl and P7 of the hockey skate blade shown in Figure 15. Hence, in the outward pass for a figure skate, thegrinder motor 405 is not started until the edge E7 has been detected, i.e. at time T24. Thebrake 403 will have been released as before, i.e. by edge E2, so that the picks of the blade will have been able to depress thewheel 409 as they moved forward over it. By the time the edge E7 is reached, the wheel will be beyond the picks. The variations in the speed of traverse of the cradle assembly and other procedures follow the same sequence as for the hockey skate, i.e. steps H12 to H17. - (F10) On the return pass, again the same procedure is followed until the edge E7 is again detected, whereupon the
brake 403 is applied, i.e. at time T25. - (Fll) If a medium or heavy grind has been ordered, this procedure is repeated. If no repeat is called for, or after having performed the necessary repeats, the
cradle cylinder 515 is again reversed and thebrake 403 released. This means that, starting from the position P7 and with the grinding wheel still turning, the cradle assembly is again moved in an outward pass. The speed of travel is regulated as before, i.e. from S4 down to Sl and up again to S7. At the edge E17, thebrake 403 is again applied. At the edge E18, the time delay Dl is again commenced. Thegrinder motor 405 is stopped and the travel direction reversed after the delay Dl. A complete return pass is then made with themotor 405 no longer driven and thebrake 403 released. This return pass continues until the cradle assembly has reached its start position as indicated by thelimit switch 730, whereupon steps H21 to H23 are adopted. It will thus be seen that, for a light grind, a figure skate is moved in two double passes. The first double pass is the same as for a hockey skate, except that the front area of the blade (points Pl to P7) is not ground. The second double pass consists of an outward pass that is the same as the first outward pass and a return pass that is entirely ineffectual as far as grinding is concerned. Thus, in effect, there will be three grinding passes, compared to the two given to a hockey skate. On medium grind, a figure skate will receive five grinding passes and, on heavy grind, seven grinding passes. This procedure is adopted to enable the stopping of the grinding motor to take place when the wheel is out of contact with the blade. - If desired, the operation can be so modified that the incremental changes in the traversing speeds from S8 down to Sl and up again to S7, the example for the outward pass PO given in Figure 15, is different for the return pass PR. For example, in the return pass a constant speed can be adopted throughout, or fewer increments can be used, say speed S2 between edges E18 and Ell and between edges E10 and El and speed Sl between edges Ell and E10. As a still further alternative, the return pass can retain the numerous increments of speed, while the outward pass is simplified. In other words, provided one of the passes is carried out at varying traversing speeds, it is not essential that the other be the same. However, to achieve uniformity of the ultimate depth of cut, i.e. after a pair of passes, and substantial elimination of the end effect, the speed or speeds adopted on the return pass will have to be taken into account in selecting the values chosen for the varying speeds on the outward pass, and vice versa.
- The system is thus especially well adapted to modification to accommodate different blade profiles.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84105970T ATE36461T1 (en) | 1983-06-10 | 1984-05-25 | DEVICE FOR SHARPENING SKATES. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000430117A CA1208023A (en) | 1983-06-10 | 1983-06-10 | Ice skate sharpening machine |
CA430108 | 1983-06-10 | ||
CA430117 | 1983-06-10 | ||
CA000430108A CA1210935A (en) | 1983-06-10 | 1983-06-10 | Ice skate sharpening machine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0128430A2 true EP0128430A2 (en) | 1984-12-19 |
EP0128430A3 EP0128430A3 (en) | 1985-12-27 |
EP0128430B1 EP0128430B1 (en) | 1988-08-17 |
Family
ID=25670057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840105970 Expired EP0128430B1 (en) | 1983-06-10 | 1984-05-25 | Ice skate sharpening machine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0128430B1 (en) |
DE (1) | DE3473409D1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1989000443A1 (en) * | 1987-07-17 | 1989-01-26 | Svenska Skatebox Ab | Skate sharpening device |
US11806826B2 (en) | 2019-09-11 | 2023-11-07 | Prosharp Inc. | Automatic blade holder |
US11878386B2 (en) | 2019-09-11 | 2024-01-23 | Prosharp Inc. | Automatic blade holder |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE851002C (en) * | 1951-06-23 | 1952-09-29 | Hudora Werk Hugo Dornseif | Device for grinding the running surfaces of ice skates |
US3789551A (en) * | 1972-02-28 | 1974-02-05 | Custom Radius Corp | Skate sharpening devices |
US4078337A (en) * | 1977-01-10 | 1978-03-14 | Chiasson Robert H | Apparatus for sharpening ice skate blades and the like |
US4294043A (en) * | 1978-01-16 | 1981-10-13 | Glenn Sakcriska | Ice skate sharpener |
-
1984
- 1984-05-25 EP EP19840105970 patent/EP0128430B1/en not_active Expired
- 1984-05-25 DE DE8484105970T patent/DE3473409D1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE851002C (en) * | 1951-06-23 | 1952-09-29 | Hudora Werk Hugo Dornseif | Device for grinding the running surfaces of ice skates |
US3789551A (en) * | 1972-02-28 | 1974-02-05 | Custom Radius Corp | Skate sharpening devices |
US4078337A (en) * | 1977-01-10 | 1978-03-14 | Chiasson Robert H | Apparatus for sharpening ice skate blades and the like |
US4294043A (en) * | 1978-01-16 | 1981-10-13 | Glenn Sakcriska | Ice skate sharpener |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1989000443A1 (en) * | 1987-07-17 | 1989-01-26 | Svenska Skatebox Ab | Skate sharpening device |
US11806826B2 (en) | 2019-09-11 | 2023-11-07 | Prosharp Inc. | Automatic blade holder |
US11878386B2 (en) | 2019-09-11 | 2024-01-23 | Prosharp Inc. | Automatic blade holder |
Also Published As
Publication number | Publication date |
---|---|
DE3473409D1 (en) | 1988-09-22 |
EP0128430A3 (en) | 1985-12-27 |
EP0128430B1 (en) | 1988-08-17 |
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