JPH09150352A - Abrasive jig for abrading chisel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart a straight line shape or a projecting shape to an inclined face to demarcate the cutting edge, particularly, of a chisel besides a recessed shape imparted by a radius of a grinding wheel by solving a problem related to polishing of the chisel. SOLUTION: A jig to polish a grinding chisel 1 by using a grinding wheel 4 or similar one, has a support body 5 having support part 6 which can be fixed to the grinding wheel by the support body 5 and whose whole extends in parallel to the axis of the grinding wheel. A bearing sleeve 8 is installed on the support part 6 so as to swing in a plane vertical to the axis of the grinding wheel as a whole, and receives a bar 9 movable in a swinging plane of the bearing sleeve 8. This bar 9 carries a swingable locking stirrup-shaped member 10 on the free end closer from the grinding wheel 4, and the swingable stirrup-shaped member can be locked on a different position, and the chisel 1 is firmly fixed to the jig in this position.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to the first aspect of the present invention.
The present invention relates to a polishing jig for polishing chisel (round chisel (only)) of the type defined in the introduction of the section.

[0002]

2. Description of the Related Art Finger-shaped turning chisel, farming (f
For example, it is very difficult to polish chisel and injured stone. The chisel is usually ground straight as received from the supplier and is therefore often unsuitable for its intended purpose, requiring the user to regrind it.

Chisel is often freehand polished using high speed grinding (dry polishing) or underwater grinding wheels. Uniform grinding of chisel is generally performed using a hand-held device in which the chisel is supported by only one leg against the floor in front of the grinding wheel. Be fastened. With this tool, it is almost impossible to perform finger shape grinding of chisel accurately and symmetrically.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems associated with polishing chisel, especially so-called finger-shaped turning chisel, in which the radius of the grinding wheel is on the slope defining the cutting edge of the chisel. In addition to the concave shape given by, the linear shape or the convex shape is given.

[0005]

The above-mentioned object can be achieved by using the polishing jig of the present invention described in the characterizing part of claim 1.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, typical embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figures 1 (a) to 1 (c) show chisel, ie the tip of a turning chisel 1 in the same state as it would normally be supplied by the supplier. The chisel shown has a beveled surface 2 defining its cutting angle α.
And has two surfaces 3 that form the so-called side slopes by polishing the sides of the chisel. It is often desirable to polish the chisel into a so-called finger shape to enhance its usefulness.
Such a finger shape is shown in FIGS. 2 (a) to 2 (c). In this case, the chisel is polished in the polishing process by rotating the chisel,
As a result, both oblique polishing surfaces 2 and side slopes that define the cutting angle of the chisel are formed continuously.

According to the present invention, such a chisel can be polished very easily in a simple manner.

4 and 5 show a polishing jig of the present invention for polishing the chisel 1 into a finger shape. FIG. 4 shows a portion of the grinding wheel 4 and a universal support 5 which is arranged close to the grinding wheel mounting portion and which can be raised and lowered. The universal carrier has, in a known manner, a portion 6 extending parallel to the grinding wheel axis. The sleeve 8 including the journal bearing 7 is swingably and displaceably carried by the part 6 of the universal carrier which extends parallel to the axis of the grinding wheel. As is clear from FIG. 4, the journal bearing 7 is arranged below the sleeve 8 at a distance a from the sleeve 8,
As a result, the chisel 1 can be twisted (turned) so that it can be polished at an angle of at least 180 °. A rod 9 is mounted in the sleeve 8,
The rod is movable in the longitudinal direction of the sleeve and its ends project outwardly from the sleeve 8. The so-called lock stirrup member (stirrup) 10 is
At the end of the rod 9 located close to the grinding wheel, it is mounted so as to be swingable and lockable. The locking stirrup member 10 can thus be swung relative to the longitudinal axis 11 of the rod 9 and the longitudinal axis 12 of the chisel 1.
, The chisel is locked in a different angular position β, and the chisel is firmly fixed in the locking stirrup member by means of a screw 13. The screw 13 has a grip 14 whose tip acts to positively lock the tool against the V-block 15 of the locking stirrup 10.

At the end of the rod 9, which is located further from the grinding wheel 4, there is provided a stop ring 16 which is axially movable along the end of the rod. The rod 9 still comprises an axially restricted groove 17 in which the end of a screw 18 screwed into the stop ring 16 extends. The screw 18 is formed integrally with the handgrip 19, and the stop ring 16
Act to lock different positions along the rod 9.

The manner in which the chisel is polished by the jig of the present invention can be easily understood from FIGS. 4 and 5. The cutting angle α depends on the length of the chisel protruding from the locking stirrup-shaped member and the portion 6 of the universal support extending from the grinding wheel.
Determined by the distance of. The side slopes corresponding to the side slopes shown in FIGS. 2 (a) to (c) twist the locking stirrup-shaped member and the tool 1 about the longitudinal axis of the rod 9 (roll). Obtained by The shape of the side slope (finger-shaped grinding), ie its length d (see FIG. 2), is determined by the angle β between the tool and the longitudinal axis 11. The preferred angle β is 20 ° and the jig can be graduated with large and small angles around this value, as shown at 20 in FIGS. 4 and 5, or with similar markings. Can be attached. The smaller the angle, the shorter the side slope, and the larger the angle, the longer the side slope. The side slopes are concave and have a radius corresponding to the radius of the grinding wheel.
However, the jig according to the invention can be quickly reconfigured to obtain a linear or convex side slope. Convex side slopes may be desired, for example, by a turning operator for certain lathe operations. To reset the jig,
This is done by grinding the chisel with a stop ring 16 that locks in the position closest to the sleeve 8. Then, the stop ring is separated from the sleeve 8 by a distance of, for example, 10 to 15 mm, and the lock stirrup member 10 is moved together with the chisel 1 as shown in FIGS. 2 (a) to 2 (c). , To the grinding wheel and the tail 21 of the cutting edge is polished to form the desired convex side slope. The front edge of the cutting edge can be simultaneously polished by moving the jig away from the grinding wheel without changing the setting state of the jig, and this is automatically performed by the rotation of the grinding wheel. Therefore, it is possible to grind the leading edge of the cutting edge and the trailing edge of the cutting edge in one and the same setting, which results in a convex side bevel or a beveled grinding surface 2, the degree of convexity being the stop ring 16 Is determined by the distance c set by
The rod 9 can be provided with scales, for example to facilitate its adjustment.

In the illustrated embodiment, the locking stirrup member 10 is locked to the rod 9 by means of a lip screw and nut, although other fastening devices, such as a grip carrying screw, can be used. . The rod 9 does not have to be smooth, as shown in FIGS. 4 and 5, but is provided with threads that engage the threads in the bearing sleeve 8 so that the rod 9 moves axially within the sleeve. The stop ring 16 may have a handle that is screwed onto the rod 9.

[Brief description of the drawings]

FIG. 1 is a side view, a longitudinal sectional view and a plan view of the tip of a chisel according to the present invention;

FIG. 2 is a side view, a partial cross-sectional view, and a plan view of the tip of a finger-shaped polished chisel according to the present invention;

FIG. 3 is a diagram showing the outline of a chisel;

FIG. 4 is a view showing a polishing jig constructed according to the present invention;

5 is a front view of the jig shown in FIG. 4. FIG.

[Explanation of symbols]

 1 chisel 2 bevel 3 side bevel 4 grinding wheel 5 support 6 support 6 journal bearing 8 sleeve 9 rod 10 lock stirrup member 11 longitudinal axis of sleeve 12 longitudinal axis of chisel 13 screw 14 Grip 15 V-block 16 Stop ring 17 Groove 18 Screw 19 Grip 20 Scale 21 Rear

Claims (6)

[Claims] 1. A polishing jig for polishing a chisel (1) using a grinding wheel (4) or the like, which support can be fixed in position with respect to the grinding wheel. A polishing jig having (5) and a supporting portion (6) extending entirely parallel to the axis of the grinding wheel, wherein a bearing sleeve (8) mounted on the supporting portion (6).
A bearing sleeve, which as a whole can be swung in a plane perpendicular to the axis of the grinding wheel, and which receives a rod (9) which can be moved in the swing plane of the bearing sleeve (8);
And said rod (9) carries a swingable locking stirrup (10) at its free end near said grinding wheel (4),
A polishing jig, wherein the locking stirrup-shaped member can be locked at different positions, and the chisel (1) is firmly locked to the jig at this position. 2. The free end of the rod (9) remote from the locking stirrup (10) carries a stop (16) movable along the rod. The polishing jig according to claim 1. 3. A polishing jig as claimed in claim 2, characterized in that the stop has the shape of a stop ring (16) which can be locked in a selected position along the rod (9). 4. The bearing sleeve (8) wherein the rod (9) is
Screwed into the rod so that the rod is movable therein, the stop (16) having the shape of a gripping abutment member screwed onto the rod (9). The polishing jig according to claim 2 or 3. 5. The rod (9) so as to read the angle (α) between the rod (9) and the locking stirrup (10).
And the locking stirrup-shaped member (10) has graduations (20) cooperating with each other, the abrasive treatment according to any one of claims 1 to 4. Ingredient 6. The end of the rod (9) remote from the locking stirrup (10) so that the position of the rod (9) within the bearing sleeve (8) can be determined. Has a scale (20), The polishing jig according to any one of claims 1 to 5.