JP2739915B2 - Cylindrical drilling tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cylindrical drilling tool.

[0002]

2. Description of the Related Art FIGS. 1 and 2 show such a conventional drilling tool.

The tool 1 shown in FIG. 1 has the most basic configuration. One end of a cylindrical tool body 2 is closed by a flange 3, and a shank 4 is screwed into a center screw hole of the flange. I have. When piercing is performed with such a tool, it may be difficult to remove the material clogged inside the cylindrical tool body 2 after piercing.

The tool 8 shown in FIG. 2 has been developed to solve such a problem. In this tool, a cylindrical tool main body 10 and a flange 12 for closing one end of the main body are formed separately, and these two members are connected by a disk which is screw-engaged with a tip of a shank 14 passing through the flange. This is performed by the shape member 16 and the split ring 18 set between the disc-shaped member and the cylindrical tool body 10.

That is, in this tool, the shank and the flange are not screw-engaged, and when the shank 14 is rotated clockwise in the flange, the disk-shaped member 16 screw-engaged with the tip of the flange becomes It is designed to be close to the flange side. For this reason, this disk-shaped member 1
6 spreads the split ring 18 in the radial direction through the wedge-shaped inclined surface and pushes the split ring 18 between the split ring 18 and the cylindrical tool body 10 to fix the cylindrical tool body and the flange. Become.

In this tool, when the material clogged in the tool body 10 is removed after the drilling operation, the shank 14 is rotated counterclockwise relative to the disk-shaped member 16 to remove the material. The disc-shaped member 16 is separated from the flange 12, whereby the split ring 18 is reduced,
The flange 12 can be removed from the cylindrical tool member 10.

However, with this tool, the screw engagement between the shank tip and the disc-shaped member 16 is strongly tightened by the rotational force applied to the shank during the drilling operation,
Therefore, when trying to loosen the disk-shaped member 16 as described above, it is necessary to rotate the shank with a strong force,
For this purpose, a specially prepared tool must be used, and the operation is difficult.

[0008]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention provides a drilling tool which can easily remove a cylindrical tool member and a flange without requiring a special tool. It is intended to provide.

[0009]

That is, a tool according to the present invention has a cylindrical tool body having a plurality of blades formed at one end edge at a predetermined interval, and the other end of the tool body is closed. A cylindrical drilling tool having a flange to which a rotational driving force transmitting shank is coupled, the flange having a portion inserted inside the other end of the cylindrical tool body, A radially displaceable, radially outer fixed position for engaging the cylindrical tool body and connecting and fixing the cylindrical tool body and the flange, and a radially inner fixed position for releasing the fixing of both. A fixing member displaceable between a release position is attached, and the flange is a member displaceable between a first position and a second position along an axial direction. There, for fixing when in the first position A pressing member having a pressing surface for pressing the material to the fixing position and a releasing surface radially inward of the pressing surface for allowing the fixing member to return to the releasing position when in the second position. A pressing means is provided. The fixing member is a split ring,
On the inner peripheral surface of the cylindrical tool, an annular groove corresponding to the split ring is provided in a plane substantially perpendicular to the center axis of the tool main body. When the pressing member is at the first position, the split ring is connected to the cylindrical tool body and the flange by being pressed and expanded by the pressing member and engaging a radially outer portion thereof in the annular groove. When the pressing member is at the second position, the diameter is reduced to separate from the annular groove to release the connection. An opening such as a recess or a hole is provided in the cylindrical wall of the cylindrical tool body, and a portion of the flange inserted into the cylindrical tool body is provided with a rotation transmitting member inserted into the opening. Is transmitted to the cylindrical tool body by engagement of the rotation transmitting member and the side wall of the opening.

In a more specific example, an opening provided in the cylindrical wall of the cylindrical tool main body has a concave formed in the edge of the other end of the cylindrical tool main body so as to extend in the axial direction of the tool main body. The rotation transmitting member provided on the portion of the flange inserted into the cylindrical tool body is a projection provided on the peripheral surface of the portion, and the rotational force transmitted through the flange from the shank is used as the rotation transmitting member. It is adapted to be transmitted to the cylindrical tool body by engagement of the recess. The split ring is formed of a member having a substantially circular cross section, and the annular groove has a substantially semicircular cross section corresponding to the split ring.

In one embodiment, the pressing means is located axially outside the other end of the cylindrical tool body and is mounted so as to be rotatable about the axis of the cylindrical tool body with respect to the flange. Has a cylindrical outer member provided with a female screw on the inner peripheral surface thereof, and the pressing member has a male screw threadedly engaged with the female screw of the cylindrical outer member. The cylindrical outer member is displaced in the axial direction by relatively rotating. In one example, a portion of the flange inserted inside the other end of the cylindrical tool body is provided with a force transmitting member that is movable in the radial direction of the portion, and the pressing surface of the pressing member is When the pressing member is at the first position, the force transmitting member is pushed radially outward to press the fixing member to the fixing position, and the release surface of the pressing member is
When the pressing member is in the second position, the force transmitting member is allowed to be displaced radially inward so as to allow the fixing member to return to the release position.
The pressing means is an inner member set inside the cylindrical outer member and capable of being displaced in the axial direction along the shank, and a male screw formed on the outer peripheral surface of the inner member is provided on the outer surface of the cylindrical outer member. An inner member threadedly engaged with a female screw formed on the inner peripheral surface, wherein the pressing member is locked by the inner member and is displaced in the axial direction together with the inner member, so that the first and the second Displaced between positions.

In yet another embodiment, the flange includes at least one screw hole extending in the axial direction, and a pressing member adapted to be displaced along the screw hole by being screwed into the screw hole and rotated. Is provided, the tip of the pressing member has a conical shape, the conical tip engages with the fixing member, and a large diameter portion of the conical tip presses the fixing member to the fixing position. The small diameter portion of the conical tip defines a release surface that allows the securing member to return to the release position.

[0013]

Hereinafter, the present invention will be described with reference to FIGS.

FIGS. 3 and 4 show a first embodiment of the present invention.

That is, the drilling tool according to this embodiment is:
As in the prior art, a cylindrical tool body 24 having a plurality of blades 22 attached to the edge 20 at one end at a predetermined interval.
And a flange 28 to which the other end of the tool body is closed and to which the shank 26 for transmitting the rotational driving force is connected at the center.

The flange 28 has a large-diameter portion 30 having the same diameter as the outer peripheral surface of the cylindrical tool body 24, and a small-diameter portion 32 inserted into the cylindrical tool body. The flange is provided with a plurality of axial holes 34 that penetrate in the axial direction at predetermined intervals in the circumferential direction around the shank 26, and radially outward from each of the axial holes. An elongated radial hole 36 (only one is shown in the drawing) is provided. An annular groove 38 is formed on the outer peripheral surface of the small diameter portion over substantially the entire periphery thereof, and a radial hole 36 communicates with the annular groove 38.

A split ring 40 as a fixing means for fixing and connecting the flange 28 and the cylindrical tool body 24 is fitted in the annular groove 38 of the flange. The pressing member 42 is movable along the hole, and the radial hole 36 is provided with a force transmitting member 48 including a spherical member 44 and a cylindrical member 46.

As shown in the figure, the pressing member 42 has a constricted portion 50 including a central small diameter portion and upper and lower large diameter portions.
The spherical member 44 of the force transmitting member 48 is in contact with the constricted portion 50. The surface of the large-diameter portion below the constricted portion has a force transmitting member 48, ie, a spherical member 44 and a cylindrical member 46 when the pressing member is in the position shown in the figure.
Is formed in the radial direction to expand the diameter of the split ring 40. In this state, the split ring 4
0 is an annular groove 52 formed on the inner surface of the cylindrical tool body 24
Pressing inward fixes the cylindrical tool body and the flange. Further, the small diameter portion of the constricted portion 50 becomes a position corresponding to the spherical member 44 in a state where the pressing member 42 is moved slightly below the illustrated position, and the force transmitting member 48 can be displaced radially inward. The diameter of the split ring 40 is reduced by its elasticity to form a release surface for releasing the fixing between the cylindrical tool body and the flange.

The pressing member 42 includes a driving means 54 described below.
Is displaced in the axial direction of the shank.

That is, this driving means is set on the outer surface of the flange 28 and is rotatable on the outer surface about the shank 26, and is set inside the cylindrical member. , An annular inner member 58 which is axially displaceable along the shank 26, and which are screwed to each other via a female screw formed on the outer member and a male screw formed on the inner member. Is engaged.
The pressing member 42 has a portion projecting upward from the flange 28, and this portion is locked to the inner member 58. Therefore, when the outer member 56 is rotated relative to the inner member 58, the inner member 58 moves up and down in the axial direction, and the pressing member 42 is displaced in the axial direction.

In the figure, reference numeral 60 designates a pin set to extend radially into a small-diameter portion of the flange 28, and the tip of the pin projects from the side surface of the small-diameter portion to form a cylindrical shape. It is adapted to fit into a recess or notch 62 formed on the upper edge of the tool body 24, and to transmit the rotational driving force transmitted from the shank 26 to the flange 24 by the engagement between the pin and the notch. I can do it.

FIG. 5 shows another embodiment.

That is, in this embodiment, the force transmitting member 4
The tip of the cylindrical member 46 ′ has a forked fork shape, and when the cylindrical member is pressed by the fixing member 40, the tip projects radially outward from the fixing member. Hole 64 formed in cylindrical tool body 24
, And has the same function as the pin 60 in the first embodiment.

FIG. 6 shows still another embodiment.

That is, in this embodiment, the axial hole 50 'of the flange 28 is formed as a screw hole near the outer peripheral surface of the flange, and the pressing member 42' is formed with a male screw on the outer peripheral surface to form the hole 50 '. And is displaced in the axial direction by rotating in the screw hole. The distal end portion of the pressing member 42 has a conical shape, the conical distal end portion is directly engaged with the fixing member 40, and the surface of the small diameter portion of the distal end portion corresponds to the release surface.
Further, the surface of the large-diameter portion forms the pressing surface. Therefore, in this embodiment, a member corresponding to the force transmitting member in the above embodiment is omitted.

[0026]

As can be seen from the above description, in the drilling tool according to the present invention, the pressing member for increasing the diameter of the split ring 40 as the fixing member is affected by the rotation of the tool during the drilling operation. Nothing. Therefore, it is not difficult to move the pressing member due to the rotational force of the drilling operation as in the above-described conventional tool. Further, in the drilling tool according to the present invention, the transmission of the rotational driving force from the shank to the cylindrical tool body is mainly performed by opening the concave portion 62 or the hole 64 provided at one edge of the cylindrical tool body, The engagement between the flange 60 and a rotation transmitting member such as a force transmitting member 48 provided on the flange is performed. The axial connection between the flange (therefore, the shank) and the cylindrical tool body is performed by the split ring 40 and the cylindrical Since the shaping is performed by engagement with the annular groove 38 formed on the inner peripheral surface of the shaped tool main body, a large tightening force is required to connect the cylindrical tool main body to the shank as in a conventional drilling tool. Therefore, the connection of the cylindrical tool body can be easily performed without using a special tool such as a wrench unlike the conventional drilling tool.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a conventional drilling tool.

FIG. 2 is a sectional view showing another conventional drilling tool.

FIG. 3 is a cross-sectional side view of the drilling tool according to the first embodiment of the present invention.

FIG. 4 is a partial front exploded view of the tool.

FIG. 5 is a sectional view showing a main part of the second embodiment.

FIG. 6 is a sectional view showing a main part of a third embodiment.

[Explanation of symbols]

22 --- blade; 24 --- cylindrical tool body; 26
--- shank; 38-- annular groove; 40-- split ring; 42--pressing member; 62--concave, 6
4 ---- holes (these constitute the opening of claim 1);
--- Projection, 48 in FIG. 5 --- Force transmission member (these constitute a rotation transmission member).

Claims (8)

(57) [Claims] 1. A cylindrical tool body having a plurality of blades formed at an edge of one end at predetermined intervals, a flange to which the other end of the tool body is closed and a shank for transmitting a rotational driving force is connected at the center. A cylindrical drilling tool having: a portion in which the flange is inserted inside the other end of the cylindrical tool body, the portion being radially displaceable in the cylindrical tool body; A fixing member displaceable between a radially outer fixing position for engaging and coupling and fixing the cylindrical tool body and the flange, and a radially inner releasing position for releasing the fixing of the both. Is attached to the flange, and is a member that is displaceable between a first position and a second position along the axial direction,
A pressing surface that presses the fixing member to the fixing position when in the first position, and a pressing surface that allows the fixing member to return to the release position when in the second position. In a drilling tool provided with a pressing means having a pressing member having a release surface radially inward, the fixing member is a split ring, and the inner peripheral surface of the cylindrical tool is provided with the same tool. Ho with respect to the central axis of the body
An annular groove is provided crucible corresponding to the split ring in a plane at right angles, the split ring, when the pressing member is in the first position, the radially outward is pressed expanded by the pressing member The part is engaged in the annular groove to connect the cylindrical tool body and the flange, and when the pressing member is at the second position, the diameter is reduced to separate from the annular groove and the connection is established. An opening is provided in the cylindrical wall of the cylindrical tool body, and a rotation transmitting member inserted into the opening is provided in a portion of the flange inserted into the cylindrical tool body. The rotational force transmitted from the shank through the flange is transmitted to the cylindrical tool body by engagement of the rotation transmitting member with the side wall of the opening. Drilling tools and features. 2. The method according to claim 1, wherein the cylindrical tool body is provided on a cylindrical wall.
The opening to be opened is the other end of the cylindrical tool body.
At the edge of the tool body so as to extend in the axial direction of the tool body.
Inside the cylindrical tool body of the above flange
The rotation transmitting member provided in a portion to be inserted is
The projection is provided on the peripheral surface of the
The rotational force transmitted through the flange is
The engagement is transmitted to the cylindrical tool body.
Drilling tool according to claim 1, characterized in that they are. 3. The split ring has a substantially circular cross section.
The annular groove is formed by a member,
The cross-section is generally semicircular accordingly
The drilling tool according to claim 1 . 4. The pressing means is located axially outside the other end of the cylindrical tool body and is attached to the flange so as to be rotatable about the axis of the cylindrical tool body. It has a cylindrical outer member provided with a female screw on its inner peripheral surface, and the pressing member has a male screw that is screw-engaged with the female screw of the cylindrical outer member. 4. A method according to claim 1, wherein the cylindrical outer member is displaced in the axial direction by relatively rotating the outer member.
A drilling tool according to any of the preceding claims. 5. A portion of the flange inserted inside the other end of the cylindrical tool body is provided with a force transmitting member movable in a radial direction of the portion, and a pressing surface of a pressing member. When the pressing member is at the first position, the force transmitting member is pushed radially outward to press the fixing member to the fixing position, and the release surface of the pressing member is
The force transmitting member is allowed to be displaced radially inward so as to allow the fixing member to return to the release position when the pressing member is at the second position. The drilling tool according to any one of 1 to 4. 6. The inner member, wherein the pressing means is set inside the cylindrical outer member and is displaceable in the axial direction along the shank, and a male screw formed on an outer peripheral surface of the inner member is provided. It has an inner member that is screw-engaged with a female screw formed on the inner peripheral surface of the cylindrical outer member,
The perforation according to claim 4 , wherein the pressing member is locked to the inner member and is displaced in the axial direction together with the inner member so as to be displaced between the first and second positions. tool. 7. When the force transmitting member presses the fixing member to the fixing position, the force transmitting member projects radially outward from the fixing member and is inserted into the opening formed in the cylindrical tool body. A projection is formed at a radially outer end of the force transmitting member, and the force transmitting member constitutes the rotation transmitting member.
Drilling tool according to claim 5, characterized in that form. 8. A cylindrical tool body in which a plurality of blades are formed at an edge of one end at predetermined intervals, and a flange to which the other end of the tool body is closed and a shank for transmitting a rotational driving force is connected at the center. Wherein the flange has a portion inserted inside the other end of the cylindrical tool body, the portion is radially displaceable, the cylindrical tool body A radially outer fixed position for engaging and connecting and fixing the cylindrical tool body and the flange,
A fixing member displaceable between a radially inner release position for releasing the fixation of both is provided, and
At least one screw hole extending in the axial direction at a position radially outward from the shank on the flange, and a pressing member displaced along the screw hole by being screwed into the screw hole and rotated. The pressing member is provided with a distal end portion having a conical shape, the conical distal end portion is engaged with the fixing member, and a large diameter portion of the conical distal end portion corresponds to the fixing member. A drilling tool, comprising: a pressing surface for pressing to a fixing position; and a small diameter portion of the conical tip portion forming a releasing surface for allowing the fixing member to return to the releasing position.