JP3423028B2 - Holder device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holder device for fixing an adapter to which a tool such as a drill, a reamer or a tap can be attached to a holder body.

[0002]

2. Description of the Related Art Generally, a holder device comprises an adapter to which a held member such as a tool can be attached and a holder body.
By inserting the adapter into the holder body, the adapter is fixed to the holder body. In this type of holder device, it is necessary to lock the adapter in the axial direction with respect to the holder body.

Therefore, the applicant of the present invention interposes a plurality of rolling elements between the adapter and the holder main body as a locking mechanism of this type, and the rolling elements are inserted at the base end side of the adapter when the adapter is inserted or pulled out. A structure having a relief portion such as a U groove that is accommodated in a free state and a centering portion such as a V groove that holds the rolling element between the adapter and the holder body when fixing the adapter is proposed (special feature Kaihei 5-8106).

[0004]

In the holder device, when the adapter is inserted into the holder body, it is necessary to move the rolling element in the U groove into the V groove to hold the rolling element in a sandwiched state. It was not enough to insert the adapter into the holder body, and the adapter had to be positively rotated with respect to the holder body with relatively strong force. Further, when the adapter is pulled out from the holder main body, it is necessary to open the holding state of the rolling element, so that there is a similar problem.

Therefore, an object of the present invention is to provide a holder device capable of fixing the adapter to the holder body or releasing it from the holder body by a simple operation.

[0006]

The present invention for solving the above problems BRIEF SUMMARY OF THE INVENTION comprises a holder body, and the adapter which is adapted to be inserted into the holder body holds the tool, said holder body Is movably held in a certain range in a substantially circumferential direction, and is capable of receiving the rolling element protruding toward the outer circumference of the inserted adapter and the protruding rolling element formed on the outer circumference of the adapter, and at least approximately A rolling element groove including a lock groove extending in the circumferential direction, a collar rotatably mounted on the outer circumference of the holder main body, engaged with the rolling element, and provided between the holder main body and the collar,
An urging means for urging the collar in the substantially circumferential direction so as to allow the rolling element to enter the lock groove via the collar,
It is provided between the holder body and the collar, locks the collar at a constant circumferential position with respect to the holder body, and when the adapter is inserted in the holder body, the adapter causes the holder body to move in the radial direction. A holder device provided with a locking member that is moved outward and releases the locking.

Further, the urging means is rotatably mounted on the outer circumference of the holder main body, and is interposed between the collar that engages with the rolling element and the collar and the holder main body. And a spring for urging.

Further, the rolling element groove receives the projecting portion of the rolling element when the adapter is inserted into the holder body, and the receiving groove extending in the axial direction, and is bent from the inner end of the receiving groove. Preferably, the lock groove extends. The holder main body holds the rolling element in an elongated hole extending in the circumferential direction perpendicular to the axis of the holder main body, and the lock groove has a tip end of the adapter more than a line perpendicular to the axis from the connecting position with the receiving groove. Or the holder main body holds the rolling element in an elongated hole extending obliquely toward the holder main body proximal end direction with respect to a line perpendicular to the axis of the holder main body, and the lock groove is It is preferable that it extends in a circumferential direction perpendicular to the axis from the connection position with the receiving groove.

[0009]

[Operation] When the adapter is inserted into the holder body and fixed, when the adapter is axially inserted into the holder body, the rolling element of the holder body rolls while being received in the rolling element groove of the adapter and faces the lock groove. become. At this time, the locking of the locking member is released, and the rolling element enters the lock groove by the biasing force of the biasing means. Since the lock groove extends substantially in the circumferential direction, the rolling element cannot move in the axial direction, so that the adapter can be fixed to the holder body. That is, the adapter can be fixed to the holder body simply by inserting the adapter into the holder body in the axial direction.

When the adapter is removed from the holder body, the rolling element may be held at the fixed position by the locking member against the biasing force of the biasing means. This allows
Even if the adapter is pulled out in the axial direction as it is, the rolling element can be moved in the axial direction along the receiving groove, and the adapter can be removed from the holder main body.

[0011]

Embodiments of the present invention will now be described with reference to the accompanying drawings. The holder device of the present embodiment comprises a holder body and an adapter that is inserted into the holder body and held / fixed to the holder body. As shown in FIG. 1, a taper hole 11, a straight shaft hole 13, and a straight shaft hole having a diameter slightly smaller than this are provided from the tip (left side in the figure) to the base end (right side in the figure) of the inner circumference of the holder body 10. 12 are formed. At the base end of the shaft hole, there is provided a bottomed cylindrical retainer 16 that holds a steel ball 14 for centering and supporting the base end of an adapter, which will be described later, inside the shaft hole 12, and the retainer is a mounting screw. It is fixed to the holder body by 18.

A collar 26 is fitted between the small hole 20 of the retainer 16 and the mounting screw 18. Further, the base end side of the head portion 19 of the mounting screw and the base end 21 of the shaft hole 12 are
A washer 24, 25 for the mounting screw is provided around the collar, and a collar 26 is sandwiched between these washers. Further, a disc spring 28 is interposed between the base end of the retainer and the washer 25 to urge the retainer 16 toward the tip of the holder body.

As shown in FIG. 2, a portion of the holder body near the tip has a small outer diameter and is formed in a step shape. In this step portion 30, an elliptical elongated hole 32 having a long diameter in the circumferential direction is formed. A metal ball 34 corresponding to a rolling element is housed in the elongated hole.

This elongated hole is formed so as to have a width slightly larger than that of the rolling element so as to hold the rolling element 34 so as to be rotatable and prevent the rolling element from falling into the shaft hole 12. Therefore, the short flange 36 is provided so as to project from the end portion of the shaft hole side. The metal balls 34 have a diameter larger than the thickness of the step portion 30, and thus are held so as to project from the outer and inner peripheral surfaces of the step portion 30, respectively.

As shown in FIGS. 2 and 5, the elongated hole 3 is formed.
A small metal ball 38 for locking the holder main body and a holder collar described later is provided on the base end side of the slot 0 which is slightly smaller than 0.
Is formed with a circular locking opening 40.
Further, from the end face 49 on the base end side of the step portion 30, the short cylinder 44 is
Is projected toward the tip (see FIG. 2), and one end of a coil spring 46 extending in the circumferential direction along the end face 49 is fixed to the short cylinder. The other end of this coil spring is
The holder collar 48 is attached to the end portion 52 of the notch 50 formed on the inner surface of the holder collar 48, which will be described later in detail (see FIG. 4), and is attached to the holder body 10 in the clockwise direction when viewed from the tip side of the holder body. I am energetic.

The holder collar 48 is shown in FIGS.
, The holder collar 48 is rotatably fitted around the stepped portion 30 of the holder main body 10. The holder collar 48 has an end surface 49 of the stepped portion and an O-ring 54 at the outer peripheral end of the tip. It is attached to the holder body so that it cannot be pulled out. As shown in FIGS. 1 and 4, a holding groove 56 is formed on the inner surface of the holder collar 48 for accommodating the rolling element 34 and holding it in the circumferential direction and extending in the axial direction. The holding groove is formed with a width substantially equal to the diameter of the rolling element, and the holder collar 48 is formed on the holder body 10.
When mounting the
8 can be attached to the holder body from the axial direction. Therefore, when the holder collar is rotated by the urging force of the coil spring 46 or is rotated in the opposite direction against the urging force, the holder collar holds the rolling element 34 in the holding groove 56, The moving body is moved along with the holder collar along the elongated hole 32 of the holder body.

Further, as shown in FIGS. 4 and 5, a circular shape for accommodating a locking small ball 58 for locking the holder collar to the holder body is provided in the vicinity of the holding groove 56 of the holder collar. The locking opening 60 is formed. A small screw 61 is screwed into the locking opening via a coil spring 62. As a result, the small balls 58 are urged toward the holder body by the elastic force of the coil spring. As shown in FIG. 5, the opening 60 has substantially the same diameter as the opening 40 of the holder main body, and when the two are aligned, the small diameter 58 is partially recessed in the opening 40 of the holder main body by the urging force of the coil spring 62. Then, the small ball 3 in the opening 40
8 is configured to slightly project inward from the inner peripheral surface of the holder body. In this state, the holder collar 48 and the holder body 10 are modestly locked, and the locked state is released by pushing the small balls 38 outward from the inside. Further, when both are in the locked state, the holder collar is in a state of being rotated in a direction against the biasing force of the coil spring 46. In addition, on the outer periphery of the holder collar 48, minute irregularities 62 for preventing slippage are formed on the surface to allow the holder collar to be manually rotated (see FIGS. 1 and 4).

As shown in FIG. 4, two notches 50 and 51 are formed on the inner surface of the holder collar 48 on the base end side so as to be point-symmetrical to each other with a constant width in the circumferential direction.
When the holder collar is mounted on the holder body, the free end of the coil spring 46 is supported on the end portion 52 of the notch, and the holder collar 48 is circumferentially arranged with respect to the holder body 10 as described above. Urge to. The short cylinder 44 shown in FIG. 4 and the coil spring 46 fixed to the short cylinder 44 are also shown, and there is another one in the direction of the point pair line, and these are the end portions of the other notches 51 of the holder collar. It is in contact with 53.

Next, the adapter to be inserted into the shaft hole of the holder body will be described. As shown in FIG. 3, when the adapter 70 is inserted into the shaft hole 12 of the holder body,
A base end shaft portion 72 that is inserted into the retainer 16, a straight shank 74 that is formed continuously with this shaft portion and that is inserted into the shaft hole 12, and a relatively sharp taper 75;
Large diameter portion 76 corresponding to the large diameter shaft hole 13 of the holder body
, A taper portion 78 that is pressed against the taper hole 11 of the holder body to be centered, and a tool mounting portion 80 that holds a tool.

The shaft portion 72 is formed to have a shorter diameter than the straight shank 74, and when the adapter 70 is inserted into the holder body 10, the shaft portion 72 is evenly held from the outer periphery by the steel ball 14, and the centering at that portion is performed. Done. On the outer circumference of the large diameter portion 76 of this adapter, there is formed a rolling element groove 82 on the adapter side which accommodates the rolling element 34 when the adapter is inserted into the holder body. This rolling element groove 82 is
As shown in FIG. 4, the receiving groove 8 extending in the axial direction of the adapter
4 and the receiving groove 8 extending in the circumferential direction of the adapter
4, and a lock groove 86 that is inclined toward the tip of the adapter at an angle θ with the elongated hole 32 on the holder body side.
And (see FIG. 7). The receiving groove 84 is positioned so as to be aligned with the rolling element 34 positioned by the holder collar when the holder collar is locked to the holder main body, and the receiving groove 84 smoothly projects inward when the adapter is inserted. The rolling element 34 that operates is received.

As shown in FIG. 3, a flange 92 is formed on the tip end side of the taper portion 78 of the adapter 70, and a pair of flanges 92 are formed on the flange portion so as to project axially from the tip end of the holder body 10. Key 94 (see Figures 1 and 2)
Is provided with a key groove 96. By engaging the key with the key groove, the adapter and the holder main body are engaged in the rotational direction, and the rotation of the holder main body is reliably transmitted to the adapter. Further, the receiving groove 84 is arranged so that the rolling element 34 can be received in an aligned state by inserting the adapter into the holder body so that the key groove and the key engage with each other.

In the tool mounting portion 80 of the adapter, as shown in FIG. 3, the taper hole 9 whose diameter is expanded toward the tip is provided.
8 is formed, and the collet 100 for fixing the tool is inserted into the tapered hole. A plurality of slits (not shown) are formed in the axial direction on the outer circumference of the collet to ensure elasticity in the circumferential direction. The tip of this collet projects from the adapter, and a lock nut 102 is provided around the projected collet. By rotating this lock nut, the collet 100 slides in the taper hole in the axial direction, and the collet 100 can be tightened or loosened in the radial direction.

Next, the operation of this embodiment will be described. First, when the holder body 10 does not receive the adapter as shown in FIG. 1, the holder collar 48 has its opening 60 aligned with the opening 40 of the holder body so that the small ball 58 is formed as shown in FIG. It is recessed in the opening 40 and is moderately locked to the holder body. At this time, the holder collar 48
Is urged clockwise by the coil spring 46 when viewed from the front end, and as shown in FIG. 6, the rolling element 34 held by the holder collar is positioned counterclockwise in the slot 32. .

In this state, the adapter 70 is inserted into the holder body 10 axially from the tip of the holder body. At this time, when the key groove 96 and the key 94 are inserted so as to engage with each other, the rolling element 34 is smoothly housed in the axial receiving groove 84 formed in the adapter (see FIG. 6). Reception groove 8
When the rear end of 4 reaches the rolling element 34, the large-diameter portion 76 following the taper 75 of the adapter 70 contacts the small sphere 38 slightly protruding inward from the opening 40, and the small sphere 38 is moved outward in the radial direction. Move towards. When pressed by the small balls 38, the small balls 58 of the holder collar also move outward against the spring 62, and the small balls 58 can no longer lock the holder collar to the holder body. As a result, the locked state of the holder collar 40 with respect to the holder body 10 is released. When the locked state is released, the holder collar 48 is attached to the holder body 10.
Since the urging force is applied clockwise when viewed from the front end direction of the holder, the holder collar 48 is attached to the holder main body 1 as shown in FIG.
Rotating clockwise with respect to 0, the small ball 58 rides on the outer peripheral surface of the step portion 30.

When the holder collar 48 rotates clockwise, the holder collar 48 holds the rolling element 34 by the pressing groove 56. Therefore, as the holder collar 48 rotates, the rolling element 34 also moves along the elongated hole 32. Move in the direction. Here, as shown in FIG. 8, the rolling element groove 32 on the holder main body side extends from the inner end of the receiving groove 84 into the lock groove 86 in the substantially circumferential direction, so that the rolling element 34 enters into the lock groove 86. .
As a result, as shown in FIG. 10, the rolling element 34 is constrained at its upper portion by the holding groove 56 of the holder collar and at its axial both sides by the side wall of the slot 32 and the side wall of the lock groove 86, so that the adapter 70 is eventually It is locked in the holder body 10. At the same time, the key groove 96 of the holder collar holds the key 94 of the holder main body 10, and both are in the engaged state in the rotational direction. Furthermore, the base end portion of the adapter 70 is the copper ball 14 in the shaft portion 72, and the tip end portion thereof is
The taper part 2 of the adapter 70 is inserted into the taper hole 11 of the holder body.
Since 8 is pressure-contacted, it is centered, and the adapter 70 can be rotationally driven without rotational shake. That is, in this embodiment, both are locked with each other simply by inserting the adapter into the holder body.

In particular, in this embodiment, the lock groove 86 extends from the position where the lock groove 86 is connected to the receiving groove 84 to be inclined more toward the tip of the adapter than the line perpendicular to the holder axis, while the slot 34 is perpendicular to the holder axis. It extends (see FIG. 7). Therefore, the further the rolling element 34 enters the lock groove 86, the more the adapter 70 is drawn into the holder main body 10,
The locked state of both becomes more certain. At this time, the rolling element 32 is securely supported at the three points 104, 106 and 108 as shown in FIGS.
2 and the width of the lock groove 86 do not need to have high dimensional accuracy.

Next, the operation of pulling out the adapter from the holder body will be described. First, the holder collar 48 is rotated counterclockwise with respect to the holder body 10 when viewed from the tip. Then, as the holder collar 48 rotates, the rolling elements 3
4 retreats from the lock groove 86 along the elongated hole 32, reaches the inner end of the receiving groove 84 extending in the axial direction, and returns to the state of FIG. As a result, the adapter 70 can be taken out from the holder body 10 in the axial direction. At the same time, the small balls 58 on the holder body side are aligned again with the openings 40 on the holder collar side and slightly recessed therein, and by removing the adapter 70 from the holder body 10, the holder collar is again locked in place in the holder body. To be done.

As described above, according to this embodiment, the adapter can be locked to each other simply by inserting the adapter into the holder body, and the adapter tends to be pulled into the holder body, and the tip and the base end can be pulled. Centering is also performed automatically. When separating the two, the holder collar may be manually released to obtain a modest release state, and then the adapter may be pulled out from the holder main body.

Although the lock groove 86 is formed in an inclined shape in the adapter side rolling element groove 82, instead of this,
As shown in FIG. 11, even if the lock groove 86 is formed along the circumferential direction and the elongated hole 32 on the adapter side is inclined toward the base end (to the right in FIG. 11) with respect to the line orthogonal to the holder axis,
Similarly, the rolling element can be supported and locked at three points to obtain a force to draw the holder collar into the holder body. Of course, both the lock groove and the elongated hole may extend straight in the circumferential direction.

Further, the small spheres 38 and 58 are formed in a spherical shape. Instead of this, the small sphere 38 is formed in a cylindrical shape having an axis in the radial direction, and the small sphere 58 is formed in a cylindrical shape having an axis in the tangential direction. May be. Further, the large diameter portion 76 itself of the adapter is tapered as an extension of the tapered portion 78, and the rolling element groove 82 is formed.
May be formed on the tapered surface, and the stepped portion may be formed in a tapered shape corresponding thereto.

Next, FIG. 12 shows a modification of the centering mechanism of the base end portion of the adapter. In this modification, the rigid ball 14 as the rolling element for centering is the base end shaft portion 72 of the adapter 70.
Held in. That is, the retainer 16 is fitted on the outer periphery of the base end shaft portion 72 of the adapter so as to be slidable in the axial direction, and the plurality of hard spheres 14 are held by the retainer in a shape in contact with the outer peripheral surface of the shaft portion 72. The retainer 16 is also biased in the proximal direction (rightward in FIG. 12) by the spring 120. Further, a stopper 122 having a U-shaped cross section is screwed to the most proximal end of the proximal shaft portion 72 so as to wrap the most proximal end. Reference numeral 124 is an O-ring for sealing. Also in this modification, by inserting the adapter 70 into the holder body 10, the hard sphere 14 centers the base end shaft portion 72 of the holder body 10 with respect to the holder body.

[0032]

As described above, according to the present invention, it is possible to provide a holder device in which the adapter can be fixed to the holder body or released from the holder body by a simple operation.

[0033]

[Brief description of drawings]

FIG. 1 is an axial sectional view of a holder body.

FIG. 2 is a perspective view of a holder body.

FIG. 3 is a partial cross-sectional view of an adapter body.

FIG. 4 is an exploded perspective view showing an assembled state of the holder device.

FIG. 5 is a cross-sectional view showing a half in the radial direction showing a state where the holder collar and the holder body are locked.

6 is a cross-sectional view showing a half in a radial direction corresponding to the AA cross section of FIG. 1 before the adapter is fixed to the holder main body.

FIG. 7 is a plan view showing the movement of the rolling elements in the storage groove.

FIG. 8 is a cross-sectional view showing a half in a radial direction corresponding to the AA cross section of FIG. 1 in a state where the adapter is fixed to the holder main body.

FIG. 9 is a sectional view showing a half in a radial direction showing a state where the adapter is inserted into the holder main body.

FIG. 10 is an axial sectional view showing a state in which the adapter is fixed to the holder body.

11 is a schematic diagram showing another example of FIG. 7. FIG.

FIG. 12 is a sectional view showing a modification of the centering mechanism.

[Explanation of symbols] 10 Holder body 32,82 Rolling element storage groove 34 rolling elements 48 holder color 56 retaining groove 70 Adapter

Front page continuation (56) References JP 61-71936 (JP, A) JP 5-8106 (JP, A) JP 46-11367 (JP, B1) JP 46-14149 (JP , Y1) Patent 37602 (JP, C1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23B 31/22 B23B 31/107

Claims (8)

(57) [Claims] 1. A holder body, While holding the toolThe aboveIt will be inserted into the holder body
With a growling adapter,The above Hold the holder body so that it can move within a certain range in the circumferential direction.
Held and project towards the outer circumference of the inserted adapter.
Rolling element,The above Receives the protruding rolling element formed on the outer circumference of the adapter.
Lock groove that is allowed and extends at least approximately in the circumferential direction.
A rolling element groove includingThe rolling element is rotatably mounted on the outer circumference of the holder body.
A collar to engage with, The collar is provided between the holder body and the collar.
The rolling element into the lock groove via
Urging means for urging the collar in a substantially circumferential direction, The collar is provided between the holder body and the collar.
To the holder body at a constant circumferential position,
When the adapter is inserted into the holder body,
Is moved outward in the radial direction of the holder body by
With a locking member that releases the stop , Holder device equipped with. 2. The locking member includes a first spherical body housed in a first locking opening formed in the collar, and the first locking body.
A spring for urging the sphere toward the holder body side, and a second sphere housed in a second locking opening formed in the holder body, wherein the first and second locking means are provided. When the openings are aligned, part of the first spherical body is recessed into the second locking opening by the biasing force of the spring to lock the collar and the holder body, and The second sphere is projected inward from the inner peripheral surface of the holder main body, and the second sphere is moved outward in the radial direction of the holder main body by the adapter when the adapter is inserted into the holder main body, The holder device according to claim 1, wherein the first spherical body is moved to the first locking opening to release the locking. 3. The urging means comprises: the collar; and a spring interposed between the collar and the holder body for urging the collar in one circumferential direction. The holder device according to 2. 4. The rolling element groove receives a protruding portion of the rolling element when the adapter is inserted into the holder main body, and a receiving groove extending in the axial direction, and a bending groove extending from a deep end of the receiving groove. The holder device according to claim 1, comprising the existing lock groove. 5. The holder main body holds the rolling element in an elongated hole extending in the circumferential direction perpendicular to the axis of the holder main body, and the lock groove is more than the line perpendicular to the axis from the connecting position with the receiving groove. The holder device according to claim 4, wherein the holder device extends obliquely toward the tip of the adapter. 6. The holder main body holds the rolling element by an elongated hole extending obliquely in the base end direction of the holder main body with respect to a line perpendicular to the axis of the holder main body, and the lock groove is connected to the receiving groove. The holder device according to claim 4, wherein the holder device extends in a circumferential direction perpendicular to the axis. 7. A plurality of second rolling elements, which are held on the inner circumference of the base end portion of the holder main body or the outer circumference of the base end portion of the adapter, are evenly arranged in the circumferential direction. The center of the base end portion of the adapter is configured to be centered.
Holder device described. 8. A first taper surface which is formed on the inner circumference of the tip portion of the holder main body and which gradually increases in diameter in the tip direction,
A second taper surface formed on the outer periphery of the tip end of the adapter and having a shape complementary to the first taper surface is further provided, and the tip end of the adapter is centered by pressure contact of the double-sided taper surfaces. The holder device according to claim 7, wherein the holder device is configured as described above.