Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
  • B24D15/06—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
  • B24D15/06—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges
  • B24D15/08—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges of knives; of razors

Definitions

• the object of this invention is thus to provide a device that can maintain the selected sharpening angle throughout a sharpening session while enable selection of the desired sharpening angle prior to commencing with a sharpening action.
• This invention relates to sharpening equipment for sharpening a sharpenable edge of appropriate items and to a sharpening set assemblable into the sharpening equipment. 2
• Knife sharpening devices are known in the art. According to one arrangement a sharpening stone is recirpocable mounted by way of a rod to be moved over the edge of an article desired to be sharpened. To accommodate various sharpening angles the device provides a number of reciprocating apertures spaced in series along a formation. The rod is fitted along the aperture that results in the sharpening angle nearest to that required. (US 4 512 112)
• sharpening equipment for sharpening a sharpenable edge of appropriate items such as knives, scissors, chisels or the like.
• Figure 1 shows sharpening equipment in the form of a sharpening device for sharpening a sharpenable edge as found on an appropriate item such as a knife, scissors, a plane cutter or the like, in side elevation as set for sharpening an item of which the sharpenable edge is steeply bevelled, as in the case of the blade of a knife,
• Figure 2 shows the device as set according to figure 1 , in plan view
• Figure 3 shows the device as set for sharpening an item with a less steeply bevelled sharpenable edge such as a pair of scissors, in side elevation,
• Figure 4 shows the device as adapted into clamping fashion holding an appropriate item such as a chisel, in side elevation, 3
• Figure 5 shows the device as readjusted into sharpening a serratedly or like edged item such as a knife with a serrated cutting edge, in side elevation,
• Figure 6 shows in detail the gripping means of the device as incorporating the angle adjustment facility
• Figure 7 shows the device along the view A-A in figures 1 , 3 and 4,
• Figure 8 shows the base of the device as fitted with upstanding sharpening stones after removal of the guiding layout and the gripping means
• Figure 9 shows a conventional serrated edge sharpening element used when the device is readjusted according to figure 5.
• sharpening equipment in the form of sharpening device is generally indicated by reference numeral 10.
• the device 10 comprises gripping means generally indicated by reference numeral 12, a sharpening means carrier in the form of sharpening element holder as provided by a sharpening element holding base 14 releasably holding a sharpening element in the form of a sharpening stone 16, a guiding layout arranged to perform a sharpening session at a constant sharpening angle in the form of a guiding arm as provided by a guiding rod 18 mounted to reciprocate along an aperture in an adjustably mounted support guide 20 in parallel with the sharpening surface 16.1 of the sharpening stone 16 in response to retaining equal corresponding inner angles 22, and an angle adjustment facility in the form of a swivelling mechanism forming the connection between the rod 18 and the gripping means 12 as provided by an connecting arm 24 extending integrally with respect to the gripping means 12 and being swivellably connected to the leading end of the rod 18 via a disc 26 4
• the gripping means 12 is provided a jaw fashion assembly 30 comprising an upper jaw 32 extending into the arm 24 and a lower jaw 34.
• An item of which the cutting edge requires sharpening is gripping fashion receivable in the pinching zone 36 defined between the jaws 32, 34.
• Such item is securely so held in response the tightening of a tightenable element 40 engaging screw fashion between the jaws 32, 34.
• an adjustment element 42 situated towards the rear ends of the jaws 32, 34 engages screw fashion with the jaw 32 while urging with its inner end against the inner wall of the jaw 34 as suitably recessed to limit relative adjacent movement of the jaws 32, 34.
• the jaws are retained apart even if not holding an item by means of a spring 44 fitted onto the element 40 between the jaws 32, 34.
• the assembly 30 is arranged to cause its central axis 46 to pass through the pivotal point 48 between the gripping means and the rod 18 in response to the suitable formation of the connecting arm 24. Once an item is thus pinched in the zone 36 the axis 46 passes along its cutting edge.
• a knife 50 is normally held at a relatively small inner angle 22 to result in the one face 50.1 of its leading edge 50.2 lying flush against the sharpening surface 16.1 as its cutting edge bevelling angle is steep. As more clearly shown in figure 2 the knife 50 is pinched in the pinching zone along its blunt edge 50.3. When the cutting edge bevelling angle is not so steep, as shown in the case of scissors 52 in figure 3, the angles 22 require adjustment, as discussed below, to retain the leading edge face 52.1 requiring sharpening in contact with the sharpening surface 16.1.
• the gripping means 12 permits adaptation into forming a clamp 54 as shown in figure 4.
• the jaw 32 presents adjacent engaging apertures 56 (as seen in figure 2) engageable by means of wing nuts 58 used for securing a clamp formation 60 to the inner surface of the jaw 32.
• the clamp formation 60 is thus used to clamp an appropriate item, such as a chisel 62, to the gripping means 12 by way of gripping it to the inner surface of the jaw 32.
• its handle 64 extends alongside the disc 26.
• the leading portion of the chisel 62 is still located in the zone which defines the pinching zone in the case of the figures 1 to 3 embodiment the chisel 62 will still lie along an axis 66 that passes through the pivotal point 48.
• desired sharpening depends on the relevant face of the leading edge of a sharpenable item lying flush against the sharpening surface 16.1.
• the guiding layout in conjunction with the swivelling mechanism is thus formed to accommodate an infinite variety of bevels within the range of the device 10.
• the device 10 is fitted with a correlator in the form of a linear member as provided by the handle portion 70.1 of the screw 70 which extends in parallel with the sharpening surface 16.1 once the screw 70 is fitted to the guide 20.
• Sharpening is achieved by to-and-fro movement of the sharpenable edge of the appropriate item over the sharpening surface 16.1 in the direction of arrow 72. This is done by manual displacement of the gripping means 12 while urging it to the desired extent against the 6
• the base 14 makes provision for filmy holding the stone 16 in position once fitted to thereto by means of a seat 75 into which the stone is locked via a locking plate 77 as secured to the base 14 by means of a wing nut 79.
• the stone 16 is often required to be replaced during a sharpening action to pass though a procedure requiring stones of different grits.
• an object of which an edge is desired to be sharpened is thus secured to the gripping means 12, the desired angle selected on the dial and the support guide 20 locked to the rail 68 in a rod 18 to sharpening surface 16.1 parallel relationship. Sharpening is achieved by desirably sweeping the sharpenable edge over the surface 16.1. Once the one side of the sharpenable edge has been desirably sharpened the gripping means 12 is simply swivelled though 180 degrees owing to the threaded engagement of the rod 18 to the disc 26 and the procedure repeated for the opposite side.
• the device 10 permits the replacement of the disc 26 and the gripping means 12 by a conventional sharpening element 76 for use in conjunction with not-linear edges, as shown in more detail in figure 9. Disengagement is achieved by the leading end of the rod 18 fitting screw fashion into the socket 27 fast with 7
• the sharpening element 76 is fitted with a socket by means of which it engages screw fashion with the rod 18. To bring the item of which the non-linear edge requires sharpening into a sharpening relationship with the element 76 it is again gripped in the pinching zone 36 of the gripping means 12 as now fitted to the bottom end of the rail 68.
• the rail 68 is thus releasably secured to the base 14 by being screw fashion received in a threaded socket in the base 14 and so locked by means of a wing nut 80.
• An indication of the sharpening angle is achieved by the rail 68 presenting graduated markings 82 that indicate the sharpening angle 84 for as long as the gripping means 12 extends transverse to the rail 68.
• the guide 20 provides a desiredly shaped aperture 84, as shown in figure 7 in a wing 20.1 which has an oblong shape in the direction of the rail 68 while also permitting lateral play to attend to adjacent serrations or the like.
• the invention deals with a device 10 which is constituted from various members the invention also extends to a set constituting the gripping means 12 as fitted with the disc 26, the holding base 14, a sharpening stone 16, the guiding rod 18, the support 20, the rail 68.
• the set can also include the sharpening element 76 and the sharpening stones 86.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Paper (AREA)
• Magnetic Ceramics (AREA)
• Apparatuses And Processes For Manufacturing Resistors (AREA)
• Facsimile Image Signal Circuits (AREA)
• Image Processing (AREA)
• Picture Signal Circuits (AREA)

Applications Claiming Priority (5)

Publications (2)

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• 1999
  • 1999-05-05 AU AU41029/99A patent/AU4102999A/en not_active Abandoned
  • 1999-05-05 AT AT99924554T patent/ATE273107T1/de not_active IP Right Cessation
  • 1999-05-05 DE DE69919345T patent/DE69919345T2/de not_active Expired - Lifetime
  • 1999-05-05 WO PCT/ZA1999/000031 patent/WO1999056915A1/en active Application Filing
  • 1999-05-05 EP EP99924554A patent/EP1075356B1/de not_active Expired - Lifetime
  • 1999-05-05 CA CA002331369A patent/CA2331369A1/en not_active Abandoned

Non-Patent Citations (1)

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