JPH0321931Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates only to a corner used in a corner chisel.

(Prior art) Conventional corner chisels have a structure in which the case is first attached to the corner cutter side, and then the drilled blade is chucked and attached (see Utility Model Application No. 54-35496). You have to adjust the amount of output. Therefore, the work was troublesome and there was a risk of injury due to the cutting edge. Furthermore, since the case is attached using a spline fitting method, it is not only troublesome to fit it in, but also wears out due to rotation, causing play.Furthermore, the chuck's tightening torque is low, causing it to slip and become difficult to handle.

(Technical Problem) The purpose of the present invention is to solve the above-mentioned problems and drawbacks, and to provide only a corner that is easy to handle, has no danger, and is easy to adjust.

(Technical Means) The object is to fit a shaft 4 for power coupling into the axial tip of the shaft 3 of the drilled blade 2 which is rotatably supported inside the main body 1 at the corner, and to connect the shaft 4 to the shaft 4. One-way bearing 2 is installed on the outer peripheral surface of the rear end in the axial direction.
A case 6 is fitted into the center hole 26 of the main body 1 and forms a cylindrical surface 5 that engages with a plurality of rolls 25a facing inside the center hole 26. An operating member 7 that can move forward and backward in the axial direction is interposed on the outside or inside of the shaft 4, the operating member 7 is movable in the axial direction with respect to the shaft body 3, and a screw The operating member 7 and the shaft body 3 are screwed together by a portion 16, and are assembled to be moved in the axial direction by a rotation operation. 3 is linked by an engaging means 8 consisting of a stepped portion 15 or an abutment portion 15' provided on the shaft body 3 at a portion that engages with either a part that moves together with the operating member 7 or the operating member itself. This can only be achieved by using sharp corners.

(Example) This will be explained below with reference to the drawings.

In the drawing, the corner body 1 has a cylindrical shape with blades 1a and 1b only at the tip and ridgeline, and the cutting waste of the drilled blade 2 rotating in the hole penetrating the inside is discharged from the outlet 9 on the side. do. Main body 1 has case 6 on the base side
The drill bit 2 is integrated with a shaft 3 that passes through the inside thereof, and a shaft 4 for power coupling is fitted to the rear end by a fitting part 10 to rotate together. An operating member 7 for moving the shaft 3 back and forth is combined between the rear part of the case 6 and the shaft 3.

Reference numerals 11, 12, and 13 designate members or bearings that rotatably support the shaft body 3 toward the main body case side. A collar 14 is interposed between the front bearings 11, 12 and the rear bearing 13, and the collar 14 is operated by the operating member 7. The front bearings 11 and 12 are kept in a constant position relative to the rear bearing 13. Reference numeral 15 designates a stepped portion of the shaft body 3 serving as an engaging means 8 that engages with the front bearing 11;
When the operating member 7 moves forward, the front bearing 11 pushes the stepped portion 15 and causes the drill bit 2 to protrude relatively. Reference numeral 16 denotes a threaded portion consisting of a male and female thread screwing together the operating member 7 and the case 6, 17 a bolt connecting the shaft body 3 and the shaft 4, 18 a washer thereof, and 19 a threaded portion between the shaft 4 and the operating member 7. At the engagement surface, the step portion 15 and the engagement surface 19 constitute engagement means 8 with the operating member 7 .

In the example shown in FIG. 3, a bolt as the operating member 7 is screwed axially forward from the rear end of the shaft 4, and the shaft 3 can be pushed out at the tip of the operating member 7. and are wedged together by key 10',
It is formed so that it can rotate freely within the case 6. Reference numerals 18' and 18'' are retainers for the shaft 4. Reference numeral 15' is a stopper for the shaft 3 as an engaging means 8 that engages with the tip of the non-threaded internal rod 7' located axially inward of the operating member 7. The abutting portion at the rear end is pushed by the advancement of the operating member 7 to advance the shaft 3.Other configurations may be the same as described above.

Further, 20 is a corner chisel, the main parts of which are shown in Figure 2, 21 is a corner only mounting base, 22 is a holding part into which the rear part of the corner only case 6 is inserted, and 23 is a corner only shaft. Motor shaft located at the rear on the axis of 4, 2
A coupling ring 4 connects the motor shaft 23 and the shaft 4 via a one-way bearing 25 by bosses 24a and 24b at both ends. The bearing 25 may be a commercially available one, and has several rolls 25a that fit into the center hole 26 and the shaft 4, as shown in FIG. Connects and disconnects power by intervening or separating. 25c indicates a compression spring.
Note that two can be used when transmitting in both forward and reverse directions. Reference numeral 27 indicates gunmetal, 28 indicates a positioning notch for orienting only the corners, and 29 indicates a screw that engages with the notch 28. Figure 4 shows a corner cutter that uses only the corners of the example in Figure 3, with a motor shaft 23 and an upper boss 2.
4a is of the Jacob taper coupling type, and the other configurations may be the same as described above except that the size of the bearing 25 is different.

(Operations and Effects of the Invention) Since the present invention is constructed as described above, by turning the operating member 7 to adjust the degree of protrusion of the drill bit 2 with respect to the cutting blade 1a, the shaft 3 moves in and out together with the drill bit 2. So it is easily adjustable. For example, in the example shown in FIG. 1, when the operating member 7 is turned clockwise, the operating member 7, which is threaded through the threaded portion 16, engages the engaging means 8 with the member 7 via the bearing 13, the collar 14, and the bearings 12, 11.
As the stepped portion 15 is pushed, the drill bit 2 protrudes, and when the shaft is turned counterclockwise, the engagement surface 19 pushes the shaft 4, causing the drill bit 2 to retreat. Next, the case 6 is held by the holding part 22 of the corner cutter, and the shaft 4 is inserted and fitted into the one-way bearing 25, thereby completing the mounting on the corner cutter. Since the shaft 4 slides on the one-way bearing 25, it can be adjusted very easily even after installation. In the example shown in FIG. 3, an operating member 7 screwed into a shaft 4 having a bolt-like portion is screwed relative to the case 6, and its tip engages the rear end of the shaft body as an engaging means 8. The joint part 15' is pushed to cause the drill bit 2 to protrude, and the tip of the drill bit is pressurized for retraction.

Therefore, according to the present invention, it is very easy to attach to a corner chisel, and the degree of protrusion of the drill bit 2 can be adjusted freely and easily, without any danger, and due to the power transmission action of the one-way bearing. , it is possible to rotate the drill bit 2 with the necessary torque regardless of wear.

[Brief explanation of the drawing]

The drawings show a corner-only embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view, FIG. 2 is a partial cross-sectional side view showing the corner-only mounting part of a corner milling machine, and FIG. 3 is a longitudinal cross-section of a modified example. 4 is a side view of the mounting part of the corner chisel machine shown in FIG. 3, and FIG. 5 is a sectional view of the one-way bearing. 1...Angle only main body, 2...Awl blade, 3...Shaft body,
4...Shaft, 5...Cylindrical surface, 6...Case,
7... Operating member, 8... Engaging means.

Claims (1)

[Scope of utility model registration request] A power coupling shaft 4 is fitted to the axial tip of the shaft 3 of the drill bit 2 which is rotatably supported inside the main body 1 only at the corner, and the outer periphery at the axial rear end of the shaft 4 is fitted. The center hole 2 of the one-way bearing 25 is placed on the surface.
A case 6 is provided on the main body 1 to attach the main body 1 to a corner cutter, and the shaft An operating member 7 that can move forward and backward in the axial direction is installed on the outside or inside of the case 6, and the operating member 7 is movable in the axial direction with respect to the shaft body 3. The operating member 7 and the shaft member 3 are combined so as to be moved in the axial direction by rotational operation, and furthermore, the operating member 7 and the shaft member 3 advance the shaft member 3 by advancing the operating member 7 with respect to the case 6. Therefore, only the corners connected by the engaging means 8 consisting of a stepped portion 15 or an abutting portion 15' provided on the shaft body 3 at a portion that engages with either a portion that moves integrally with the operating member 7 or the operating member itself.