JP2010058177A - Device for mounting disk rotary tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for mounting a disk rotary tool, which prevents a seat face of a rotating shaft from wearing or collapsing, reduces vibration during use, and facilitates attachment to and detachment from the rotating shaft. <P>SOLUTION: The rotating shaft 11 on a drive side is provided, at the outer end portion thereof, with: a seat face 11a reducing in a stepwise manner; and a small diameter threaded spindle 12, An attachment 20 is attached to a central part of the disk rotary tool 15. The attachment 20 comprises: a holder 21 in which a flange portion 23, an engagement shaft portion 25 to engage with an axial part of the disk rotary tool 15, and a male threaded portion 26 are sequentially formed; a disk fastening nut 27 having a female thread 28 formed in the axial part thereof, into which the male threaded portion 26 of the holder 21 is screwed, and also having handling holes 30 formed in the outside part thereof; and elastic bodies 31, 32 for buffering purposes. The elastic bodies 31, 32 are interposed between the disk rotary tool 15 and the flange portion 23, and between the disk rotary tool 15 and the fastening nut 27. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

 The present invention relates to a mounting device for a disk-shaped rotary tool such as a disc grindstone or a circular saw that is elastically clamped and mounted on a rotary shaft.

  A conventional technique is shown in FIG. That is, a large-diameter flange portion 3b in which a screw hole 3a is formed through the shaft portion and an outer periphery is formed from the outer end toward the inner end, and an operation hole 3c is formed on the outer surface, and the diameter is smaller than that of the flange portion 3b. The flange-shaped bolt 3 having the rotation-preventing convex portion 3d and the male screw portion 3e having a diameter smaller than that of the rotation-preventing convex portion 3d is provided. The stop projection 3d is fitted into the mounting hole 6a, and the nut 4 with the cushion material 5 attached to the outer periphery is screwed into the male thread 3e of the bolt 3.

  Thus, the center portion of the disc grindstone 6 is clamped by the flange portion 3b of the bolt 3 and the nut 4 while the cushion material 5 is elastically deformed by a predetermined amount, and the bolt 3, the disc grindstone 6, the cushion material 5 and the nut 4 are pressed. The attachment consisting of and the disc grindstone 6 are integrated.

  On the other hand, a seating surface 2b and a small-diameter screw shaft 2a are formed on the outer end portion of the driving rotary shaft 2 protruding from the case 1 in a stepwise manner. Then, the nut 4 integrated with the disc grindstone 6 is directed toward the case 1, the screw hole 3a of the bolt 3 is screwed into the screw shaft 2a, and the fastener is engaged with the operation hole 3c formed in the flange portion 3b. The disc grindstone 6 is attached to the rotary shaft 2 by pressing the inner end 3f of the bolt 3 against the seat surface 2b of the rotary shaft 2.

In the prior art, the attachment comprising the bolt 3, the cushion material 5 and the nut 4 and the disc grindstone 6 are integrated, so that the function of reducing vibration during use and the attachment of the disc grindstone 6 to the rotary shaft 2 and Removal can be easily performed. However, since the inner end 3f of the male thread portion 3e into which the nut 4 is screwed is brought into contact with the seat surface 2b of the rotary shaft 2 so that the disc grindstone 6 is attached to the rotary shaft 2, the inner end 3f of the nut 4 is fixed. The contact surface of the rotating shaft 2 is reduced, and the bearing surface 2b of the rotating shaft 2 is worn or depressed, and the disc grindstone 6 is inclined when a new set of the disc grindstone 6 and attachment is attached to the rotating shaft 2. When used, vibration will occur.
Noto 3096194 Noto 3088708

  It is an object of the present invention to provide a disk-shaped rotary tool mounting device that prevents wear and depression of the seat surface of a rotary shaft, reduces vibration during use, and can be easily attached to and detached from the rotary shaft. To do.

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is provided with a seating surface that shrinks stepwise on the outer end portion of the rotating shaft on the driving side and a screw shaft that protrudes axially outward from the axial center portion of the seating surface. A shaft is provided, and an attachment is attached to the center of the disk-shaped rotary tool. The attachment has a screw hole through which the screw shaft engages with the screw shaft, and the outer periphery extends from the inner end in the axial direction toward the outer end. A large-diameter flange portion that comes into contact with the seating surface of the rotary shaft, a fitting shaft portion that is smaller in diameter than the flange portion and fits into the axial center portion of the disk-shaped rotary tool, and the fitting shaft A disk-shaped holder in which a male screw part having a smaller diameter than the part is sequentially formed coaxially, a female screw that is screwed into the male screw part of the holder is formed in the axial center part, and an operation hole is formed in the outer part. And an elastic body for buffering, and the elastic body is a disc-shaped circuit fitted to the fitting shaft portion. Is obtained by the interposed respectively in arrangement between the between the tool and the flange portion, and said disc-shaped rotating tool and the clamping nut.
According to a second aspect of the present invention, a ring-shaped holding groove is formed in the opposed middle peripheral portion of the flange portion and the tightening nut, and an elastic body made of an O-ring is exposed to the side and fitted into the holding groove. It is a configuration.

According to the first aspect of the present invention, the axially inner end of the flange portion to which the tightening nut does not screw is brought into full contact with the seating surface of the rotating shaft, so that the seating surface is not worn or depressed. For this reason, the set product of a new disk-shaped rotary tool and attachment can be attached to a rotating shaft repeatedly with high precision. Moreover, since the contact area between the seating surface of the rotating shaft and the flange portion is large, the holder can be firmly and precisely locked to the rotating shaft. In addition, the disk-shaped rotary tool and the attachment are integrated by elastically interposing the elastic body on both sides of the disk-shaped rotary tool and elastically clamping it with the flange part of the holder and the tightening nut. Can be easily performed, and vibration during use is reduced.
In the invention according to claim 2, since the elastic body made of the O-ring is fitted in the ring-shaped holding groove formed in the intermediate peripheral portion opposed to the flange portion and the tightening nut, the elastic body can be made highly accurate. While being able to position, an elastic body can be obtained cheaply.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along line II-II of FIG. 1, FIG. 3 is a sectional view of a holder according to the present invention, and FIG. 4 is a right side view of FIG. 5 is a cross-sectional view of a tightening nut according to the present invention, and FIG. 6 is a right side view of FIG.

  In FIG. 1, 10 is a case of a disc grinder, 11 is a driving rotary shaft that protrudes outward (rightward) from the lower side of the case 10, and a seating surface 11a is formed on the outer end, The small-diameter screw shaft 12 is protruded rightward from the shaft center portion of the seat surface 11a.

  A disk-like rotary tool 15 such as a circular saw or a disc grindstone is attached to the rotary shaft 11 via an attachment 20. In this example, the disk-shaped rotary tool 15 is made of a disc grindstone, and a ring-shaped grindstone 17 is fixed to the outer peripheral surface of the substrate 16 whose inner periphery is bent in a trapezoidal shape toward the left. A center hole 18 having a spline hole shape (FIG. 2) is formed in the axial center portion of the shaft.

  The attachment 20 includes a stepped tubular holder 21, a disc-shaped fastening nut 27, and elastic bodies 31 and 32 for buffering. As shown in FIGS. 3 and 4, the holder 21 has a screw hole 22 that is threadedly engaged with the screw shaft 12 of the rotary shaft 11 in the shaft center portion, and has a large-diameter flange portion 23 on the outer periphery. A fitting shaft portion 25 having a smaller diameter than the fitting shaft portion 25 and a male screw portion 26 having a smaller diameter than the fitting shaft portion 25 are sequentially formed in a step shape from the axially inner end (left end in FIG. 1) toward the axially outer end. Yes.

  A ring-shaped holding groove 24 into which an O-ring 31 (elastic body) is fitted is formed in the middle portion of the right surface (outer surface) of the flange portion 23. The holding groove 24 has a depth at which a part of the O-ring 31 is exposed to the outside. The fitting shaft portion 25 is formed in a spline shaft shape having a smaller diameter than the flange portion 23 and is fitted in the center hole 18 of the disk-like rotary tool 15 so as not to be relatively rotatable. The fitting shaft portion 25 is formed slightly longer than the thickness of the substrate 16 of the disk-shaped rotary tool 15, and a step portion 25a is formed at the outer end thereof. The male screw portion 26 is formed to protrude rightward from the axial center portion of the step portion 25a.

  As shown in FIGS. 5 and 6, the fastening nut 27 is formed with a female screw 28 that is screwed into the male screw portion 26 of the holder 21 at the axial center portion of the disk-shaped main body, and the middle peripheral portion of the left surface (inner side surface). A ring-shaped holding groove 29 into which the O-ring 32 (elastic body) is fitted is formed, and four operation holes 30 are formed at equal pitches in the circumferential direction on the right surface (outer surface). The holding groove 29 is formed so as to face the holding groove 24 formed in the flange portion 23, and has a depth at which a part of the O-ring 32 is exposed to the outside. The operation hole 30 is for engaging a fork claw of a fastener. The fastener is engaged with the operation hole, and the fastening nut 27 is screwed into the male thread portion 26 of the holder 21.

  Next, the usage mode of the embodiment will be described. First, one O-ring 31 is fitted into the holding groove 24 of the flange portion 23, and then the fitting shaft portion 25 of the holder 21 is moved from the left (inner side) to the center hole of the substrate 16 of the disk-like rotary tool 15. 18 is fitted. Next, the other O-ring 32 is fitted in the holding groove 29 of the tightening nut 27, the O-ring 32 is directed toward the substrate 16, the tightening nut 27 is screwed into the male threaded portion 26 of the holder 21, and the operating tool is The tightening nut 27 is engaged with the operation hole 30 and screwed, and the left surface (inner surface) of the tightening nut 27 is brought into pressure contact with the step portion 25 a of the fitting shaft portion 25.

  As a result, the holder 21 and the fastening nut 27, that is, the attachment 20, are integrated with the disk-shaped rotary tool 15 in a state where the O-rings 31 and 32 are pressed against both sides of the substrate 16. Then, with the flange portion 23 of the holder 21 facing the case 10 side, the screw hole 22 is screwed into the screw shaft 12 of the rotary shaft 11, the operation tool is engaged with the operation hole 30 of the tightening nut 27, and screwed. The left surface (inner surface) of the portion 23 is brought into pressure contact with the seat surface 11 a of the rotating shaft 11.

  According to the embodiment, the end surface of the flange portion 23 comes into full contact with the seat surface 11a of the rotating shaft 11, and the holder 21 can be firmly and accurately locked to the rotating shaft 11. In addition, since the seat surface 11a of the rotating shaft 11 is not worn or depressed, a new set of the disk-shaped rotating tool 15 and the attachment 20 can be attached to the rotating shaft 11 with high accuracy over and over again. it can. In addition, O-rings (elastic bodies) 31 and 32 are interposed on both sides of the disk-shaped rotary tool 15 and elastically clamped by the flange portion 23 and the fastening nut 27 of the holder 21 to connect the disk-shaped rotary tool 15 and the attachment. Since they are integrated, attachment to and removal from the rotating shaft 11 can be easily performed, and vibration during use is reduced.

  In addition, since the elastic bodies are inexpensive O-rings 31 and 32, the O-rings 31 and 32 are fitted into holding grooves 24 and 29 formed in the opposed middle peripheral portions of the flange portion 23 and the fastening nut 27. The O-rings 31 and 32 can be positioned with high accuracy.

It is sectional drawing which shows the Example of this invention. It is an expanded sectional view by the II-II line of FIG. It is sectional drawing of the holder by this invention. FIG. 4 is a right side view of FIG. 3. It is sectional drawing of the fastening nut by this invention. FIG. 6 is a right side view of FIG. 5. It is sectional drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disc grinder case 11 Rotating shaft 11a Seat surface 12 Screw shaft 15 Disk-shaped rotary tool 16 Substrate 17 Grinding stone 18 Center hole 20 Attachment 21 Holder 22 Screw hole 23 Flange portion 24 Holding groove 25 Fitting shaft portion 25a Step portion 26 Male screw Part 27 Clamping nut 28 Female thread 29 Holding groove 30 Operation hole 31, 32 O-ring (elastic body)

Claims (2)

  A seating surface (11a) that reduces in a step shape and a screw shaft (12) that protrudes outward in the axial direction from the axial center of the seating surface (11a) are provided at the outer end of the rotating shaft (11) on the drive side. The attachment (20) is attached to the center of the disk-shaped rotary tool (15), and the attachment (20) is formed with a screw hole (22) threadingly engaged with the screw shaft (12) in the axial center. A large-diameter flange portion (23) that contacts the seat surface (11a) of the rotating shaft (11) from the inner end in the axial direction of the outer periphery toward the outer end, and has a smaller diameter than the flange portion (23). And the fitting shaft part (25) fitted to the axial center part of the said disk-shaped rotary tool (15), and the external thread part (26) smaller in diameter than this fitting shaft part (25) were formed in order coaxially. Stepped tubular holder (21) and female screw (28) screwed into male screw part (26) of holder (21) at axial center part It is formed of a disc-shaped tightening nut (27) formed with an operation hole (30) on the outer side, and an elastic body (31, 32) for buffering, and the elastic body (31, 32) is Between the disc-shaped rotary tool (15) fitted to the fitting shaft portion (25) and the flange portion (23), and the disc-like rotary tool (15) and the tightening nut (27) A disk-shaped rotary tool mounting device, characterized in that each is interposed between the two.   Ring-shaped holding grooves (24, 29) are formed in the opposed middle peripheral portions of the flange portion (23) and the tightening nut (27), and elastic bodies (31, 29) made of O-rings are formed in the holding grooves (24, 29). 32. The disc-shaped rotating tool mounting device according to claim 1, wherein the disc rotating tool is exposed to the side and fitted.

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