Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1991-02-05
1993-03-23
Kisliuk, Bruce M.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51218R, 51221BS, 269 71, 269160, 269269, 76 822, B24B 336
Patent
active
051952750
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a blade sharpener especially envisaged for use in sharpening cutting instruments such as knives, axes, scissors, shears, secateurs, choppers, chisels, buzzer blades, chain saws, circular saws and hand saws and the like.
FIELD OF THE INVENTION
Previously, to sharpen a blade, an abrasive wheel has been used. The wheel is rotated at speed and the blade is drawn across the wheel so as to sharpen an edge of the blade. The angle to which the edge of the blade is sharpened is generally judged by the eye of the person sharpening the blade.
Considerable skill and experience is required to accurately sharpen blades in such manner.
Also, abrasive wheels sharpen by grinding away from the edge which method is not preferred in sharpening blades. Blade sharpening is preferably curved out by grinding toward or into the edge.
Also, such wheels rotate at speeds which cause heat to build up during sharpening which causes subsequent loss of temper of the blade edge and hence more rapid dulling thereof with use.
Also sharpening with such wheels tends to lead to the production of an edge which is not as straight or as continuous as the original edge at manufacture. Thus, although the blade edge may be sharpened it generally becomes softer and less straight, which results in the need for more frequent sharpening and less efficient cutting with the blade edge.
This is particularly true of hair dressing scissors where blade edges must co-act to cut hair. Professional quality scissors are very expensive and once they loose their manufactured edge it is very difficult to re-establish a good edge with the use of prior art apparatus. It is known to use blade sharpeners comprising a clamp mechanism to hold a blade and allow movement of a sharpening tool at an angle to an edge of the blade. Such prior art blade sharpeners suffer from insufficient adjustability of both angle of sharpening and of the clamp mechanism, as a consequence of which they are capable of sharpening only certain blades.
For example, an edge of a knife is at an angle of about 15.degree. to 35.degree. to a body of the knife. Axes and chisels have similar edges to those of knives. However, scissors have blade edges at about 40.degree. to 85.degree. to a body of the scissor blade. Chain saw teeth and saw teeth have cutting edges requiring two angles requiring special prior art sharpening devices.
No single prior art blade sharpener is able to cope with such varieties of blade and edge types.
SUMMARY OF THE INVENTION
The present invention provides a blade sharpener which attempts to overcome the above difficulties. In accordance with the present invention there is provided a blade sharpener for sharpening an edge of a blade of a cutting instrument, the blade sharpener characterised in that it comprises:
(a) a frame having a first upright member, a second upright member disposed at right angles to the first upright member, and a base upon which the first upright member and the second upright member are mounted, the base being attachable upon a bench edge or the like;
(b) a guide means being attached to the first upright member and being height adjustable thereon;
(c) a clamp means having:
(i) a first jaw comprising a first end and a second end, a first surface and a second surface each of which extends between the first end and the second end, the first surface being substantially flat, the second surface having a ledge diverging from the first end toward the second end, the first end being relatively thin, a flange extending from a longitudinal edge of the first jaw and pivotally connected to the second upright member, a threaded hole disposed through the first jaw upon a centre line thereof; and
(ii) means to clamp the cutting instrument against the first jaw at a location selected from a group consisting of, the ledge, the first surface and the second surface; and
(d) a sharpening tool having a sharpening member and a rod fixed thereto, the rod being disposed to rest upon the guide means and to be guided thereby and
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Kisliuk Bruce M.
Marlott John A.
McLean Pty. Ltd.
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