JP2009196016A - Fitting device of rotary tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting device of a rotary tool capable of speedily fitting a rotary tool to a rotary shaft with high precision, by making it possible to form the rotary shaft and the fitting device having a vibration isolating function into a unit and fit them to the rotary shaft. <P>SOLUTION: This fitting device includes: a flange part 8 thicker than the thickness of a substrate 21 of a rotary tool 20 in an axially intermediate part of a fitting tube 6 that can be screwed into a rotary shaft 1 so as to be protruded outward in a radial direction; an engagement part 8a on an outer periphery of the flange part 8 fitted in and locked with a fitting hole 21a formed in a center part of the substrate 21 of the rotary tool 20; disk-shaped inner holding plate 10 and outer holding plate 15 on the outer periphery of both ends in an axial direction of the fitting tube 6 so as to be screwed into each other; and O-rings 13 and 17 provided on mutually facing surfaces of the inner holding plate 10 and the outer holding plate 15 and on an outer peripheral side of the flange part 8 in such a manner as being protruded in a facing direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

 The present invention relates to a rotary tool attachment device that reduces vibration, noise, and the like when grinding or cutting steel, stone, or wood.

  There existed patent document 1 as a prior art. That is, a wheel washer and then a flange-shaped positioning ring (mounting ring) are passed through the rotating shaft, a vibration isolator and then a polisher (disc grindstone) are attached to the flange portion of the positioning ring, and then a wheel nut at the shaft end of the rotating shaft. And screw the wheel nut until it contacts the positioning ring. As a result, there is one in which the polisher is sandwiched between the wheel nut and the vibration isolator.

In the prior art, since the wheel washer, positioning ring, vibration isolator, polisher, and wheel nut were separated, it is necessary to assemble them on the rotating shaft at the site, and the accuracy of attaching the polisher to the rotating shaft As a result, the vibration is likely to be generated, and the attachment to the rotating shaft is troublesome.
JP-A-11-347929

  The present invention relates to a rotary tool mounting device capable of mounting a rotary tool on a rotary shaft with high accuracy and speed by making the rotary tool and a mounting device having an anti-vibration function as a unit. The purpose is to obtain.

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is provided with a flange portion thicker than the substrate of the rotary tool protruding radially outward at an axially intermediate portion of the mounting tube that can be screwed to the rotary shaft, An engaging portion is formed on the outer periphery of the flange portion to engage and lock the mounting hole formed in the central portion of the substrate of the rotary tool. A plate is provided so as to be able to be screwed together, and an O-ring is provided so as to protrude in the facing direction on the outer peripheral side of the flange portion, which is a surface opposite to the inner clamping plate and the outer clamping plate. there were.
According to a second aspect of the present invention, a plurality of O-rings are arranged concentrically on opposing surfaces of the respective clamping plates and protrude in the facing direction.
According to a third aspect of the present invention, an operation tool engagement surface having a plurality of chamfered outer peripheries is formed on the back surface of the inner holding plate, and a plurality of operation tool engagement holes are formed on the back surface of the outer holding plate. is there.

  According to the first aspect of the present invention, when the rotary tool is fitted to the outer periphery of the flange portion of the attachment pipe, and the engaging portion formed on the outer periphery of the flange portion is engaged with the attachment hole of the rotary tool, the rotary tool is attached to the attachment pipe. Relative rotation is impossible. Next, the inner clamping plate and the outer clamping plate are screwed to both ends of the mounting tube in the axial direction, and both are screwed in until they come into contact with both sides of the flange portion. Deformation causes both sides of the rotary tool to be clamped by the elastic force of the O-ring. As a result, before attaching to the rotating shaft, both of them can be made into a unit with the rotary tool clamped by the mounting tube, and both can be made with high precision in a factory equipped with measuring instruments, jigs, etc. Can be unitized. Then, when the mounting tube is screwed to the rotating shaft, the mounting tube is supported by the rotating shaft with a wide contact surface, whereby the mounting tube is firmly connected to the rotating shaft with high concentricity. .

Since the invention according to claim 2 is elastically clamped by a plurality of O-rings arranged concentrically on both sides of the rotary tool, the inclination of the rotary tool with respect to the load is reduced, and the restoring force against the inclination is increased. The vibration function becomes high.
In the invention according to claim 3, by engaging the operating tool with the operating tool engaging surface of the inner holding plate and the operating tool engaging hole of the outer holding plate, the inner holding plate and the outer holding plate are attached to the mounting pipe. The attachment / detachment work and the attachment / detachment work of the attachment tube to the rotating shaft are facilitated.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a cross-sectional view of an essential part showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a mounting tube according to the present invention, FIG. 3 is a left side view of FIG. 5 is a left side view of FIG. 4, FIG. 6 is a right side view of FIG. 4, FIG. 7 is a cross sectional view of an outer clamping plate according to the present invention, FIG. 8 is a left side view of FIG. FIG. 10 is a right side view of FIG. 7, and FIG. 10 is a sectional view of an essential part showing a second embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a rotating shaft of a disc grinder. A small-diameter support portion 2 is formed at a shaft end via a step portion 1a. A screw shaft portion 2b is formed at the tip portion. Reference numeral 5 denotes an attachment device attached to the support portion 2, which includes an attachment tube 6, an inner holding plate 10, an outer holding plate 15, and O-rings 13 and 17.

  The attachment tube 6 is attached to the rotary shaft 1 so as to be screwed (screwed). As shown in FIGS. 2 and 3, the fitting shaft portion 2a of the rotary shaft 1 is provided on the inner periphery of the left end portion of the cylindrical main body. A circular fitting hole 6a that fits closely is formed, and a screw hole 6b that is screwed into the screw shaft portion 2b of the rotary shaft 1 is formed on the remaining inner periphery. A first male screw 7a is formed at the left end portion of the outer periphery, a second male screw 7b is formed at the right end portion of the outer periphery, and a large-diameter flange portion is formed at an axially intermediate portion located between the first male screw 7a and the second male screw 7b. 8 is formed. As shown in FIG. 1, the flange portion 8 is formed thicker than a substrate 21 of a rotary tool 20 to be described later. Further, as shown in FIG. 3, the flange portion 8 is radially outward at three circumferential positions on the outer periphery. An engagement protrusion (engagement portion) 8a is formed.

  The inner clamping plate 10 is attached to the left end portion (inner side) of the mounting tube 6 so as to be screwable. As shown in FIGS. 4 to 6, the inner clamping plate 10 is attached to the shaft center of the disk-shaped main body. A screw hole 10a that is screwed into the first male screw 7a is formed, a small-diameter boss portion 10b is formed on the left side (rear side), and an operation tool engagement surface 11 that is chamfered in parallel to the outer periphery of the boss portion 10b. (FIG. 5) is formed. An annular O-ring groove 12 is formed on the outer peripheral portion of the right surface, and an O-ring 13 made of an elastic material such as rubber is fitted into the O-ring groove 12 as shown in FIG. The depth of the O-ring groove 12 is made a predetermined amount smaller than the wire diameter of the O-ring 13, thereby causing the right side portion of the O-ring 13 to protrude outward from the right surface of the inner clamping plate 10.

  The outer clamping plate 15 is attached to the right end portion (outer side) of the mounting tube 6 so as to be screwable. As shown in FIGS. 7 to 9, the outer clamping plate 15 is attached to the axial center portion of the disk-shaped main body. A screw hole 15a to be screwed into the second male screw 7b is formed, an annular O-ring groove 16 is formed in the outer peripheral portion of the left surface, and the O-ring 13 described above is formed in the O-ring groove 16 as shown in FIG. The O-ring 17 made of the same material is fitted. The depth of the O-ring groove 16 is made a predetermined amount shallower than the wire diameter of the O-ring 17, thereby causing the left side portion of the O-ring groove 16 to protrude outward from the left surface of the outer holding plate 15. In addition, four operation tool engagement holes 18 are formed at equal pitches in the circumferential direction on the inner peripheral portion of the right side (back side) (FIG. 9).

  Reference numeral 20 denotes a rotary tool attached to the attachment device 5 described above. The rotary tool 20 grinds or cuts steel, stone, or wood, and is formed by adhering an abrasive 23 such as diamond grains to the outer periphery of the substrate 21. The substrate 21 is formed thinner than the flange portion 8 of the mounting tube 6 described above, and the mounting hole 21a is fitted in the center portion of the flange portion 8 of the mounting tube 6 and the engaging protrusion (engaging portion) 8a. Is formed. The mounting hole 21a has a circular reference hole 21a and an engagement recess 22 in which three circumferential portions of the reference hole 21a are cut out radially outward as shown by phantom lines in FIG. The reference hole 21a is closely fitted to the flange portion 8 of the mounting pipe 6, and the engagement recess 22 is fitted and locked to an engagement protrusion (engagement portion) 8a formed on the outer periphery of the flange portion 8. ing.

  According to the embodiment, the mounting hole 21a of the rotary tool 20 is fitted to the flange portion 8 and the engaging projection 8a of the mounting tube 6, and the inner clamping plate 10 and the outer clamping plate are disposed at both axial ends of the mounting tube 6. 15 is screwed, an operating tool such as a spanner is engaged with the operating tool engaging surface 11 of the inner clamping plate 10, and a fork-shaped operating tool is engaged with the operating tool engaging hole 18 of the outer clamping plate 15. When the inner clamping plate 10 and the outer clamping plate 15 are rotated in the screwing direction and brought into contact with both sides of the flange portion 8, the O-rings 13 and 17 are pressed against both side surfaces of the substrate 21 of the rotary tool 20 and elastically deformed. It will be. As a result, the rotary tool 20 is engaged with the mounting tube 6 through the engagement protrusion 8a so as not to rotate relative thereto, and is elastically pressed through the O-rings 13 and 17 by the inner clamping plate 10 and the outer clamping plate 15. The rotary tool 20 and the attachment device 5 are unitized by being sandwiched.

  Accordingly, the rotary tool 20 and the attachment device 5 can be unitized with high accuracy in a factory equipped with equipment such as a measuring instrument and jig before being attached to the rotary shaft 1.

  In this state, when the mounting tube 6 is screwed to the rotating shaft 1 and the inner end portion thereof (the left end portion in FIG. 1 is brought into contact with the step portion 1a of the rotating shaft 1, the mounting tube 6 supports the rotating shaft 1). The mounting shaft 6 is supported on the rotating shaft 1 by a wide contact surface by the fitting shaft portion 2a and the screw shaft portion 2b of the portion 2, and the attachment tube 6 is firmly connected to the rotating shaft 1 with high concentricity. The mounting tube 6 can be firmly screwed onto the rotary shaft 1 by engaging and screwing a fork-shaped operation tool into the operation tool engagement hole 18 of the outer clamping plate 15.

  FIG. 10 shows a second embodiment. In this example, two O-rings 13a, 13b, 17a, and 17b are concentrically arranged and attached to the right surface of the inner holding tool 10 and the left surface of the outer holding tool 15, respectively. That is, two O-ring grooves 12a, 12b, 16a, and 16b are formed concentrically on the right surface of the inner holding tool 10 and the left surface of the outer holding tool 15, respectively, and are formed in the O-ring grooves 12a, 12b, 16a, and 16b. , O-rings 13a, 13b, 17a, and 17b are respectively fitted. The depths of the O-ring grooves 12a, 12b, 16a, and 16b are formed to be shallower than the wire diameters of the O-rings 13a, 13b, 17a, and 17b fitted to the O-ring grooves 12a, 12b, 16a, and 16b. , 17a, 17b project from the inner holding tool 10 and the outer holding tool 15 in the facing direction. The other structure is substantially the same as that of the first embodiment.

  According to the second embodiment, since the plurality of O-rings 13a, 13b, 17a, and 17b concentrically arranged on both sides of the rotary tool 20 are elastically clamped, the inclination of the rotary tool 20 with respect to the load is reduced, and the The restoring force against the tilt is increased, and the anti-vibration function is enhanced. Each O-ring can be commercially available and can be obtained at low cost.

It is principal part sectional drawing which shows 1st Example of this invention. It is sectional drawing of the attachment pipe | tube by this invention. FIG. 3 is a left side view of FIG. 2. It is sectional drawing of the inner clamping board by this invention. FIG. 5 is a left side view of FIG. 4. FIG. 5 is a right side view of FIG. 4. It is sectional drawing of the outer clamping board by this invention. FIG. 8 is a left side view of FIG. 7. FIG. 8 is a right side view of FIG. 7. It is principal part sectional drawing which shows 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating shaft 1a Step part 2 Support part 2a Fitting shaft part 2b Screw shaft part 5 Mounting device 6 Mounting pipe 6a Fitting hole 6b Screw hole 7a First male screw 7b Second male screw 8 Flange part 8a Engaging protrusion (engaging part) )
DESCRIPTION OF SYMBOLS 10 Inner clamping plate 10a Screw hole 10b Boss part 11 Operation tool engaging surface 12 O-ring groove 13 O-ring 15 Outer clamping plate 15a Screw hole 16a, 16b O-ring groove 17a, 17b O-ring 20 Rotating tool 21 Substrate 21a Mounting hole 21b Reference hole 22 Engaging recess 23 Abrasive

Claims (3)

  A flange portion (8) thicker than the substrate (21) of the rotary tool (20) is protruded radially outward at an axially intermediate portion of the mounting tube (6) that can be screwed onto the rotary shaft (1). And an engaging portion (8a) in which a mounting hole (21a) formed in the central portion of the substrate (21) of the rotary tool (20) is fitted and locked on the outer periphery of the flange portion (8). A disc-shaped inner clamping plate (10) and an outer clamping plate (15) are provided on the outer periphery of both ends in the axial direction of the tube (6) so that they can be screwed together, and the inner clamping plate (10) and the outer clamping plate The rotating tool mounting device according to claim 15, wherein an O-ring (13, 17) is provided on the surface facing the surface (15) and on the outer peripheral side of the flange portion (8) so as to protrude in the facing direction.   A plurality of O-rings (13a, 13b, 17a, 17b) are arranged concentrically on the opposing surfaces of the inner clamping plate (10) and the outer clamping plate (15), and are provided so as to protrude in the facing direction. The rotating tool mounting device according to claim 1.   An operation tool engaging surface (11) whose outer periphery is chamfered into a plurality of surfaces is formed on the back surface of the inner holding plate (10), and a plurality of tool engaging holes (18) are formed on the back surface of the outer holding plate (15). 3. The rotary tool mounting device according to claim 1, wherein the rotary tool mounting device is provided.

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