RU2036067C1 - Device for sharpening of domestic cutting tool edges - Google Patents

Abstract

FIELD: sharpening and dressing of tool edges. SUBSTANCE: working members made as abrasive inserts are rigidly, attached to two handles, which can be rigidly fixed in the body to provide the necessary tool and dressing angle within 20 to 50 deg. EFFECT: enhanced convenience in use. 6 dwg

Description

 The invention relates to metalworking and for sharpening and straightening the blades of a household cutting tool, in particular household knives, dangerous razors, scalpels.

Closest to the proposed is a device for sharpening knives (ed. St. USSR N 1261772, class. 24 V 3/54, 1984), comprising a housing in which two parallel rolls are installed and fixed. On the rolls, disc working elements are freely installed, between which washers are installed. The working elements have the ability to change the angular position relative to the longitudinal axis of the rolls by an angle of 75.82 ^about , which ensures the removal of metal chips when sharpening the knife blade.

This device has the following disadvantages:
the sharpening process is uncontrollable, since sharpening is performed by unevenly removing chips from the sharpened edges of the blade, which is unacceptable for tools such as dangerous razors and scalpels;
the impossibility of adjusting the angle of sharpening of the blade of the cutting tool, since the disk working elements are located on two rolls rigidly fixed in the housing.

 The aim of the invention is to improve the quality of sharpening the blades of cutting tools.

To do this, the design of the proposed device provides the following:
the ability to install working abrasive elements along the blade profile of sharpened cutting tools;
the possibility of replacing working abrasive elements by grain and hardness depending on the type of work (sharpening or dressing).

In the case of conventional sharpening, abrasive inserts from KZ or KCH (corundum green or black) are used. For straightening blades, for example, scalpels or dangerous razors, abrasive inserts made of corundum ceramics of the Polikor brand (VK 100-1) with a roughness of working surfaces R _a = 0.1 (GOST 2789-73) are used.

 The table shows the comparative characteristics of the prototype and the proposed device.

 In FIG. 1 shows the proposed device; figure 2 is the same, a top view; figure 3 view a in figure 1; in Fig.4 node I in Fig.1 (the relative location of the sharpened and machining surfaces); figure 5 section BB in figure 4; Fig.6 profile of the cutting edge after sharpening, dressing and roughness a) according to the prototype, b) according to the proposed device.

 The device for sharpening and dressing the cutting tool blades includes a housing 1, consisting of two identical halves, in which two handles 3 are movably mounted on the axis 2 with working abrasive elements 4. The halves of the body are pulled together by two screws 5. There are cutouts on the halves of the body, forming grooves when connecting the halves of the body in which the handles move.

 On the sides of the cutouts of the housing there are radial recesses (Fig. 3), designed to accommodate the protrusions 7 of the handles in them when setting the angle of sharpening. In the grooves of the handles (figure 5) installed interchangeable working abrasive elements. For the convenience of working with the device, a rubber sleeve 6 is put on the body flange.

 The procedure for sharpening or editing blades is as follows.

 A sharpened blade, for example, a knife 8 (Fig. 5) is inserted into the slot of the body, as in the prototype, until it touches the working surfaces of the abrasive elements. If the angle of sharpening or editing the blade does not coincide with the set angle on the device, the screws 5 are loosened, turning the knobs 3 sets the necessary angle of sharpening or editing. This angle is fixed by placing the protrusions 7 on the handles in the radial recesses of the housing and fastening the halves of the housing with screws.

 Sharpening or editing is performed by moving the tool to be sharpened by reciprocating the entire length of the blade.

 To replace the abrasive elements 4, it is necessary to unscrew the screws 5, remove the collar 6, part the body half, remove the handles 3 from the axis 2 and remove the working elements 4. The working elements are installed in the reverse order.

 The proposed device extends the life of cutting tools.

Claims (1)

 DEVICE FOR GRINDING THE BLADES OF A HOUSEHOLD CUTTING TOOL, in the case of which work elements and a unit for changing their angular position are located, characterized in that the latter is made in the form of two handles located on the axis with axial grooves and protrusions, and the case is made in the form of two fastened one to the other parts with symmetrical cuts, on the sides of which vertical recesses are made, while the working elements are installed in the grooves of the handles, which are placed in the cutouts of the housing with the possibility of their fixation by means of stupas in vertical recesses.

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