JP2022042330A - Tool adaptor and machining tool - Google Patents

Abstract

To provide a tool adaptor excellent in a storage property, economical efficiency, and capable of maintaining/reinforcing joint strength even if rotation torque and axial force (striking force) is transmitted.SOLUTION: A tool adaptor 1 equipped with a tool 10 having a shank 11, has a rod 30 that transmits rotation torque and axial force, a socket 20 that is joined with an end portion of the rod 30 and transmits the rotation torque transmitted from the rod 30 to the shank 11, and a joint reinforcement body 50 that is provided at the end portion of the rod 30, applies the axial force to the shank 11, and applies expansion force to the end portion by reaction force in the axial direction.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a tool adapter capable of transmitting rotational torque and axial force (impacting force) in the axial direction to a tool such as a drill.

Patent Document 1 discloses an adapter for a striking tool as a connecting structure for a tool or the like capable of transmitting rotational torque and an axial force (impacting force) to a tool such as a drill.

Japanese Unexamined Patent Publication No. 2007-160418

When drilling holes in concrete or stone, there are various objects to be drilled depending on the purpose of construction, such as the ground, walls, or ceiling. Especially in the case of drilling to the ceiling, the holes to be drilled are used to improve the working posture. A drill of the required depth may be extended with another shank adapter and treated as a long drill.
However, the striking tool adapter according to the prior art as described above does not have a function of extending the drill. For this reason, when machining a ceiling, it is necessary to have a drill with a length according to the machining depth in order to improve the working posture, and many types of drills including considerably long drills are used. Since it is owned, it has become a heavy burden in terms of storage and economic efficiency.
Also, when extending with a shank adapter, the socket to which the shank of the drill is attached requires a key-shaped protrusion inside the cylindrical shape to transmit rotational torque. It is desirable that the socket and the extension rod be configured separately.
However, since the socket that transmits the rotational torque to the drill and the rod that transmits the axial force (impacting force) receive different forces, the socket and rod can be joined by continuing to use it in applications where rotational torque, striking force, or vibration is applied. The strength of the part was reduced and it was sometimes damaged.
For example, when a socket and a rod are screwed together, the threaded portion may break early due to metal fatigue. In addition, taper joints with female sockets and male rods do not affect the rotational torque and axial force so as to increase the joint force, so the joint may loosen due to vibration caused by impact during use. be.

Therefore, it is an object of the present disclosure to provide a tool adapter that is excellent in storage and economic efficiency and can maintain and strengthen the joint strength even when the rotational torque and the axial force (impacting force) are transmitted. And.

The present invention is grasped by the following in order to achieve the above object.
(1) The tool adapter of the present invention is a tool adapter for mounting a tool having a shank, and is joined to a rod that transmits rotational torque and axial force to the end of the rod and is transmitted from the rod. A socket for transmitting the rotational torque to the shank and an end portion of the rod are provided to apply the axial force to the shank, and an expansion force is applied to the end portion by the reaction force of the axial force. Has a joint reinforcement to be used.
(2) In the above (1), the socket has a through hole for mounting the shank on one side and joining with the rod on the other side, and the rod is provided at the end portion in the axial direction. An outer peripheral tapered surface having a hole, the joint reinforcing body joins with the hole of the rod on the outer peripheral surface, and the expansion force is applied to the hole of the rod by the reaction force of the axial force. Have.
(3) In the above (1) or (2), the socket has a socket inner peripheral tapered surface on the inner peripheral surface of the through hole on the side where the rod is joined, and the rod is the inner circumference of the hole. The surface has a rod inner peripheral tapered surface and a rod outer peripheral tapered surface on the outer peripheral surface of the end portion, and the socket inner peripheral tapered surface and the rod outer peripheral tapered surface are tapered and joined to the rod inner peripheral tapered surface. The outer peripheral tapered surface is tapered and joined.
(4) In any of the above (1) to (3), the shank has a key groove, and the socket fits the key groove on the inner peripheral surface of the through hole on the side where the shank is mounted. It has matching protrusions.
(5) In any of the above (1) to (4), the shank is an SDS plus type shank or an SDS-max type shank.
(6) In any of the above (1) to (5), the rod has a rod shank at an end opposite to the end, and the rod shank is connected to a power tool.
(7) The processing tool of the present invention has the tool adapter according to any one of (1) to (6).

According to the present disclosure, it is possible to provide a tool adapter that is excellent in storage and economic efficiency and can maintain and strengthen the joint strength even when rotational torque and axial force (impacting force) are transmitted. ..

It is an overall schematic diagram of the tool adapter which concerns on embodiment of this invention. It is sectional drawing and the side view of the socket of the tool adapter which concerns on embodiment of this invention. It is a figure which shows the tool of the tool adapter which concerns on embodiment of this invention. It is a figure which shows the tool of the tool adapter which concerns on embodiment of this invention. It is sectional drawing of the rod of the tool adapter which concerns on embodiment of this invention. It is a figure which shows the joint reinforcement body of the tool adapter which concerns on embodiment of this invention. It is a figure which shows the joining state of the tool adapter which concerns on embodiment of this invention. It is a figure which shows the joining state of the tool adapter which concerns on embodiment of this invention. It is a figure which shows the force generated in each element in the joined state of the tool adapter which concerns on embodiment of this invention.

Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings.
The same elements are designated by the same numbers or reference numerals throughout the description of the embodiments.

FIG. 1 is an overall schematic view of a tool adapter 1 according to an embodiment of the present invention.
The tool adapter 1 according to the embodiment of the present invention will be described with reference to FIG.

In FIG. 1, the workpiece 80 is a ceiling made of concrete, and shows the work of machining a machined hole 85 in the ceiling. The machined hole 85 is, for example, a pilot hole for an anchor bolt.
In such a case, in order to improve the working posture, an extension rod 30 is attached to the hammer drill 70 to extend the length. The socket 20 is joined to the tip of the rod 30. A joint reinforcing body 50 is provided inside the tip of the rod 30.

In the tool adapter 1-, the tool 10 is mounted on the side of the socket 20 that is not joined to the rod 30. Since the workpiece 80 is a ceiling made of concrete, a concrete drill is used for the tool 10 in this case. The tool 10 is appropriately selected depending on the work content, the material of the workpiece 80, and the like.

The length of the rod 30 is about 1000 mm because the ceiling is processed by standing work, but the length may be appropriately selected according to the situation of the work target, and may be about 2000 mm or shorter than 1000 mm. But it may be. For example, when processing a floor surface or a wall surface, the length of the rod 30 is about 50 mm to about 500 m.
The rod 30 is provided with a grip 40 to support the rod 30 when working with the rod 30 facing upward, such as a ceiling, and the grip 40 is an elastic body such as a spring 41 to absorb vibration during work. Pressed in the direction.

The hammer drill 70 used in FIG. 1 is included in a power tool, and is for efficiently drilling cement-based materials such as concrete, mortar, blocks, and tiles, and stone materials such as marble and granite. ..
For example, concrete is a mixture of mortar (cement + sand) and gravel (stone), and since it is difficult to cut gravel (stone) in concrete only by rotation, only cutting by rotation like a steel drill bit. Instead of drilling holes, an axial force is applied to the drilling direction in addition to rotation, and the material is crushed by the axial force (impacting force) to make holes. Therefore, the hammer drill 70 applies a rotational torque and an axial force (impacting force) to the rod 30.

The rotational torque transmitted from the hammer drill 70 to the rod 30 is transmitted to the socket 20, and further transmitted from the socket 20 to the tool 10.
The axial force (impacting force) transmitted from the hammer drill 70 to the rod 30 is transmitted to the tool 10 via the joint reinforcing body 50 provided inside the tip of the rod 30.
In this way, the rotational torque is transmitted from the socket 20 to the tool 10, the axial force is transmitted from the rod 30 to the tool 10 via the joint reinforcing body 50 without going through the socket 20, and the socket 20 and the rod 30 are transmitted to the tool 10. Since the structure is such that it receives different external forces, the strength of the joint between the socket 20 and the rod 30 may decrease as the use is continued. However, in the present embodiment, as will be described later, the socket 20 and the rod 30 are configured to be joined more strongly by the axial force.

FIG. 2 is a cross-sectional view and a side view of the socket 20 of the tool adapter 1 according to the embodiment of the present invention.
As shown in FIG. 2, the socket 20 is a cylindrical body having a through hole 22, and the shank 11 of the tool 10 is inserted and mounted on one side of the through hole 22, and the rod 30 is mounted on the other side. It is joined.

When viewed from the tool side end surface 23 on the side where the shank 11 of the tool 10 is mounted, the convex portion 27 is provided so as to protrude inward of the through hole 22 from the middle. The convex portion 27 shown in FIG. 2 shows a case where it is suitable for a shank generally called an SDS plus type shank, and its shape is appropriately changed according to the shank used.

Further, although two convex portions 27 are provided at opposite positions, the present invention is not limited to this, and one or a plurality of convex portions 27 may be provided. Further, the convex portion 27 is provided from the middle when viewed from the tool side end surface 23, but the present invention is not limited to this, and the convex portion 27 may be provided from the position of the tool side end surface 23. The arrangement and length of the convex portion 27 are appropriately changed according to the shank used.

The socket 20 is joined to the rod 30 on the side of the through hole 22 where the shank 11 of the tool 10 is not attached. The portion of the through hole 22 to be joined to the rod 30 may be a straight hole, but in FIG. 2, the socket inner peripheral tapered surface 25 is provided on the inner peripheral surface on the rod side end surface 24 side.
Further, a ball for preventing the attached tool from coming off may be built in the socket 20 so as to be compatible with a shank such as an SDS plus type shank.

When the socket 20 having the convex portion 27 provided so as to project inside the through hole 22 is integrally manufactured with a rod 30 having a length of about 1000 mm to 2000 mm, for example, the socket 20 is a rod. It is technically difficult considering that the side of 30 becomes a closed bag shape.
Further, even if it can be integrally manufactured, it is a long product having a large difference in diameter, so that it is very uneconomical whether it is manufactured by cutting or forging.
Therefore, in the present embodiment, the socket 20 having the through hole 22 and the long rod 30 are used as separate elements to join them.

3 and 4 are views showing the tool 10 of the tool adapter 1 according to the embodiment of the present invention.
As shown in FIG. 3, the tool 10 has a shank 11 for attaching to an electric drill or the like. The tool 10 shown in FIG. 3 has a shank generally called an SDS plus type shank, and has a cross-sectional shape shown in cross-sections AA. In order to transmit the rotational torque, two key grooves 13 that slide-engage with the convex portion 27 of the socket 20 are provided facing each other at a position forming 180 °. The key groove 13 is continuously provided up to the shank end surface 12, whereby the shank 11 can be inserted into the through hole 22 of the socket 20 even when the convex portion 27 to which the key groove 13 fits, the key, or the like is installed. can do.

Further, two pull-out prevention grooves 18 with which the pull-out prevention balls are engaged are opposed to each other at a position forming 90 ° with the key groove 13 and are provided halfway so as not to be connected to the shank end face 12.

The tool 10 is provided with a lead portion 14 having a spiral groove (spiral) provided from the vicinity of the center to the vicinity of the tip. Further, the tip portion 15 is provided with a cutting edge 16 for cutting the workpiece 80.
The tool 10 shown in FIG. 3 shows a concrete drill for processing concrete or the like, and the cutting edge 16 is made of cemented carbide, tungsten or the like.

FIG. 4 shows another example of the shank 11 of the tool 10. It is a shank generally called an SDS-max type shank, and has a cross-sectional shape shown in cross-section BB. In contrast to the SDS plus type shank shown in FIG. 3, the SDS-max type shank shown in FIG. 4 is often used for a drill having a large diameter, and when machining with a stronger rotational torque or axial force (impacting force). Used for.
The shank 11 is not limited to the SDS plus type shank and the SDS-max type shank, and may have a polygonal cross-sectional shape such as a hexagon.

FIG. 5 is a cross-sectional view of the tip of the tool adapter 1 according to the embodiment of the present invention, which is joined to the socket 20 of the rod 30.
The socket side end 31 of the rod 30 has a hole 35 provided in the axial direction and may be a straight hole. However, in FIG. 5, the inner peripheral surface of the hole 35 has a tapered inner peripheral surface of the rod. Has 37. That is, in FIG. 5, the diameter of the hole 35 gradually decreases as it advances in the axial direction from the socket side end portion 31.
Further, the outer peripheral surface of the socket side end portion 31 of the rod 30 may be straight, but in FIG. 5, the rod outer peripheral tapered surface 33 is provided. That is, in FIG. 5, the diameter of the rod 30 gradually increases as it advances in the axial direction from the socket side end portion 31.

FIG. 6 is a diagram showing a joint reinforcing body 50 of the tool adapter 1 according to the embodiment of the present invention.
The joint reinforcing body 50 has a shank-side end portion 51 that applies an axial force to the shank of the tool 10, and a rod-side end portion 53 that is an end portion on the opposite side thereof. The outer peripheral surface of the side surface connecting the shank side end portion 51 and the rod side end portion 53 may have a straight shape, but in FIG. 6, the shank side end portion 51 and the rod side end portion 53 are tapered surfaces. It has a structure in which it is connected by an outer peripheral tapered surface 55.
That is, in FIG. 6, the diameter of the joint reinforcing body 50 gradually decreases as it advances from the side of the shank side end portion 51 to the side of the rod side end portion 53.
The shape of the vertical cross section of the joint reinforcing body 50 is round in FIG. 6, but the shape is not limited to this, and the cross section may be, for example, a polygon such as a hexagon.

FIG. 7 is a diagram showing a joining state of the tool adapter 1 according to the embodiment of the present invention.
FIG. 7 shows the joining state of the socket 20, the rod 30, and the joining reinforcing body 50. In these joinings, each element having no tapered surface may be formed by a press-fitting structure, but in FIG. 7, the socket inner peripheral tapered surface 25 of the socket 20 and the rod outer peripheral tapered surface 33 are tapered and joined to form a rod. The inner peripheral tapered surface 37 and the outer peripheral tapered surface 55 are tapered and joined.

By forming a tapered joint in which males and females having a tapered shape are connected, it is possible to achieve the effect of maintaining and strengthening the strength of the joint as described later. Further, by making a taper joint, it is possible to join with high accuracy.

In FIG. 7, the joint reinforcing body 50 is inserted into the hole 35 of the rod 30 so that the outer peripheral tapered surface 55 is in contact with the rod inner peripheral tapered surface 37, and in this state, the rod 30 is inserted into the socket 20 to cause the socket inner peripheral taper. The rod outer peripheral tapered surface 33 is in contact with the surface 25. In this state, when an axial force is further applied in the direction of deepening the insertion, a force is generated so that the rod outer peripheral tapered surface 33 of the rod 30 is bulged outward by being pressed by the joint reinforcing body 50, thereby causing the socket. The taper joint between the inner peripheral tapered surface 25 and the rod outer peripheral tapered surface 33 becomes stronger. The basic bonding principle is the same even if it is formed by a press-fitting structure that does not have a tapered surface.

FIG. 8 is a diagram showing a joined state of the tool adapter 1 according to the embodiment of the present invention.
FIG. 8 shows a state in which the shank 11 of the tool 10 is further inserted into the joint state shown in FIG. 7. That is, it is a figure which shows the joining state when the workpiece 80 is machined by a tool 10.
FIG. 9 is a diagram showing the force generated in each element in the joined state of the tool adapter 1 according to the embodiment of the present invention.
The joining structure of the tool adapter 1 will be described with reference to FIGS. 8 and 9.

When the workpiece 80 is machined by the tool 10, the workpiece 80 is crushed and machined not only by the rotation of the tool 10 but also by the axial force (impacting force).
By applying the axial force transmitted from the hammer drill 70 from the rod 30 to the shank end surface 12 of the tool 10 via the shank side end portion 51 of the joint reinforcing body 50 provided at the tip thereof, the cutting edge 16 of the tool 10 is applied. Apply an axial force (impacting force) to the workpiece 80 to crush it, and at the same time, the rotational torque transmitted from the hammer drill 70 is transferred from the rod 30 into the through hole 22 of the socket 20 joined to the rod 30. The tool 10 rotates when the convex portion 27 provided and the key groove 13 provided in the shank 11 of the tool 10 are fitted and transmitted, and a machined hole 85 is drilled by cutting with the rotated cutting edge 16.

The crushed and cut machine chips are carried in the direction of the shank 11 by the action of a spiral groove (spiral) provided from the tip portion 15 to the lead portion 14 of the tool 10, and are discharged to the outside of the machined hole 85. ..

In FIGS. 8 and 9, by applying an axial force F to the shank end surface 12 via the shank side end portion 51 of the joint reinforcing body 50, the cutting edge 16 of the tool 10 has an axial reaction force from the workpiece 80. Upon receiving R, the shank side end portion 51 of the joint reinforcing body 50 receives this axial reaction force R from the shank end surface 12. Due to this axial reaction force R, an expansion force T acts from the outer peripheral tapered surface 55 of the joint reinforcing body 50 to the rod inner peripheral tapered surface 37 of the rod 30, whereby the rod outer peripheral tapered surface 33 also receives the expansion force T. Further, this expansion force T acts on the inner peripheral tapered surface 25 of the socket. As a result, the tapered joint between the socket inner peripheral tapered surface 25 and the rod outer peripheral tapered surface 33 is strengthened. That is, since the rod outer peripheral tapered surface 33 receives the expansion force T due to the reaction force R generated by the axial force F, the pressure generated on the joint surface between the socket inner peripheral tapered surface 25 and the rod outer peripheral tapered surface 33 becomes stronger, so that the socket The joint between the 20 and the rod 30 becomes stronger.

From this point of view, it is preferable that the outer peripheral portion of the joint reinforcing body 50 is tapered and the outer peripheral tapered surface 55 is provided with respect to the press-fitting structure, and it is more preferable that the joint between the joint reinforcing body 50 and the rod 30 is a tapered joint. In addition to these, it is more preferable that the joint between the socket 20 and the rod 30 is a tapered joint.

The expansion force T is a force in the direction perpendicular to the acting joint surface, and when the tapered joint is close to the axial direction, the force in the radial direction is the main force. That is, the expansion force T is applied from the outer peripheral tapered surface 55 and acts to expand the rod inner peripheral tapered surface 37 and the rod outer peripheral tapered surface 33 in the radial direction.
Then, by receiving a stronger expansion force T, the socket inner peripheral tapered surface 25 and the rod outer peripheral tapered surface 33 are deformed (plastically deformed) and expanded, which may result in a stronger joint.

As described above, the tool adapter 1 is configured so that the joint between the socket 20 and the rod 30 becomes stronger as the rod 30 receives a strong axial force F from the hammer drill 70. With such a configuration, it is possible to prevent a problem that the joint between the socket 20 and the rod 30 is loosened even if the socket 20 and the rod 30 are continuously used for machining for a long period of time.

The basic bonding principle is the same even if it is formed by a press-fitting structure that does not have a tapered surface. However, in the case of taper joining, a portion having a larger outer diameter of the outer peripheral tapered surface 55 continues to bite into the rod inner peripheral tapered surface 37, so that even if it is used repeatedly, the reaction force R due to the axial force F The expansion force T continues to be generated.
On the other hand, in the case of the press-fitting structure having a straight shape, it is conceivable that the expansion force T does not increase because the outer diameter of the portion that bites into the structure is the same. Therefore, tapered joining is a more preferable structure.

As described above, in the present embodiment, as the workpiece 80 is machined by the axial force (impacting force) transmitted from the hammer drill 70, the joining of the tool adapter 1 can be further strengthened.

That is, according to the present embodiment, it is possible to use a standard tool by extending it with the rod 30, and it is possible to reduce the types of tools possessed, which is excellent in storage stability and economy. Therefore, it is possible to provide the tool adapter 1 capable of maintaining and strengthening the joint strength even when the rotational torque and the axial force (impacting force) are transmitted.

Since the rod 30 transmits rotational torque and axial force from the hammer drill 70, it may have a connection structure capable of swinging in the axial direction while receiving rotational torque. In this case, the rod 30 is provided with a rod shank (not shown) at the end opposite to the socket side end 31 so as to be able to transmit such rotational torque and axial force. For example, it may be the SDS plus type shank or the SDS-max type shank shown in FIGS. 3 and 4, and the cross-sectional shape may be a polygon such as a hexagon. The rod 30 is connected to the power tool and the hammer drill 70 by this rod shank.

Further, although the description has been made with the content of using the hammer drill 70 for transmitting the rotational force and the axial force (impacting force), the present invention is not limited to this. Even for vibration drills that transmit rotation and vibration, ordinary electric drills that transmit only rotation, and other power tools, the work is performed by the operator while applying an axial force to the work piece, so it is for tools. Since the reaction force in the axial direction acts on the adapter 1, the same effect can be obtained.

In the above description, the work of machining the machined hole 85 in the ceiling is targeted, but the present invention is not limited to this, and the same action and effect can be obtained when the floor surface and the wall surface are machined. Further, it can be applied not only to drilling work but also to other work such as fishing work.

Further, in the above description, the tool adapter 1 is attached to the hammer drill 70, and the tool 10 is attached to the socket 20 of the tool adapter 1 for use, but the content is not limited to this, and the tool adapter 1 is used. The adapter 1 can also be used by incorporating it into a processing tool (not shown). As the processing tool, for example, there is a processing tool such as a drilling machine for concrete. As the length of the rod 30, a length suitable for the size of the processing tool to be incorporated is selected.

Although the present invention has been described above based on the specific embodiment, the present invention is not limited to the above embodiment, and modifications and improvements may be carried out as appropriate.

As described above, the present invention is not limited to a specific embodiment, and those which have been appropriately modified or improved are also included in the technical scope of the present invention. It is clear from the description of the scope of claims.

1 Tool adapter 10 Tool 11 Shank 12 Shank end surface 13 Key groove 14 Lead part 15 Tip part 16 Cutting edge 18 Detachment prevention groove 20 Socket 22 Through hole 23 Tool side end surface 24 Rod side end surface 25 Socket inner peripheral tapered surface 27 Convex part 30 Rod 31 Socket side end 33 Rod outer peripheral tapered surface 35 Hole 37 Rod inner peripheral tapered surface 40 Grip 41 Spring 50 Joint reinforcement 51 Shank side end 53 Rod side end 55 Outer peripheral tapered surface 70 Hammer drill 80 Work piece 85 Machined hole F Axial force R Reaction force T Expansion force

Claims (7)

A tool adapter for mounting tools with shanks.
A rod that transmits rotational torque and axial force,
A socket that joins the end of the rod and transmits the rotational torque transmitted from the rod to the shank.
It has a joint reinforcing body provided at the end of the rod, which applies the axial force to the shank and applies an expansion force to the end by the reaction force of the axial force.
A tool adapter that features this. The socket has a through hole for mounting the shank on one side and joining with the rod on the other side.
The rod has a hole provided in the axial direction at the end thereof.
The joint reinforcing body has an outer peripheral tapered surface that is joined to the hole of the rod on the outer peripheral surface and imparts the expansion force to the hole of the rod by the reaction force of the axial force.
The tool adapter according to claim 1. The socket has a socket inner peripheral tapered surface on the inner peripheral surface of the through hole on the side where the rod is joined.
The rod has a rod inner peripheral tapered surface on the inner peripheral surface of the hole and a rod outer peripheral tapered surface on the outer peripheral surface of the end portion.
The inner peripheral tapered surface of the socket and the outer peripheral tapered surface of the rod are tapered and joined.
The inner peripheral tapered surface of the rod and the outer peripheral tapered surface are tapered and joined.
The tool adapter according to claim 1 or 2, characterized in that. The shank has a keyway
The socket has a convex portion that fits into the keyway on the inner peripheral surface of the through hole on the side where the shank is mounted.
The tool adapter according to any one of claims 1 to 3, wherein the tool adapter is characterized by the above. The shank is an SDS plus type shank or an SDS-max type shank.
The tool adapter according to any one of claims 1 to 4, wherein the adapter is characterized by the above. The rod has a rod shank at the end opposite to the end.
The rod shank is connected to the power tool.
The tool adapter according to any one of claims 1 to 5. A processing tool having the tool adapter according to any one of claims 1 to 6.

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