Tip tool unit and adapter

Abstract

To provide a tip tool unit and an adapter that enable a tip tool to be easily attached to and detached from a rotary tool.SOLUTION: A tip tool unit is attached to a rotary tool 100 including a prismatic first connection part 102, and includes: a tip tool 10 including a prismatic second connection part; and an adapter 20 connecting the rotary tool 100 and the tip tool 10. The adapter 20 includes a through hole 31 having one end to which the first connection part 102 is inserted and the other end to which the second connection part 12 is inserted. The through hole 31 includes a square hole part 31b storing the first connection part 102 and the second connection part 12.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an end tool unit and an adapter. [Background technology]

[0002] Drills are tip tools used to drill holes in steel plates and adjust the diameter of the holes. For example, a step drill is a tool that drills holes of various diameters, and a reamer is a tool that adjusts the diameter of holes drilled by the drill. This type of cutting tool is available in both manual and electric versions. Patent Document 1, for example, describes a configuration that allows a reamer or drill to be attached to an impact wrench.

[0003] The connection structure (hereinafter referred to as "adapter") described in Patent Document 1 includes a housing portion into which the drive of the rotary tool is inserted, and a fixing portion provided on the surface opposite the opening of the housing portion and for fixing the cutting member. The fixing portion has a male thread that is adapted to be screwed into the female thread of the cutting member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-223659 Summary of the Invention [Problem to be solved by the invention]

[0005] When drilling holes in steel plates or the like using a rotary tool, a step drill must first be attached to the rotary tool to drill the hole, and then the step drill must be replaced with a reamer to adjust the hole diameter. Furthermore, adjusting the hole diameter may require replacing the reamer with one of a different diameter. Thus, when working with a rotary tool, various tool inserts (hereinafter referred to as "tool inserts"), such as step drills, reamers, and sockets, must be connected to the rotary tool during the work. It is desirable to be able to easily replace tool inserts with adapters in order to reduce work time. However, when using screws, there is a problem that the tool inserts are tightened by the operation of the rotary tool, making them difficult to remove.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a tool unit and an adapter that allow a tool tip to be easily attached to and detached from a rotary tool. [Means for solving the problem]

[0007] The present inventors have investigated chuck structures used in various tools to find a method for attaching a tool bit to a rotary tool by a method other than screwing, assuming that the tool bit connection portion has a shape similar to the drive angle of the rotary tool. However, when a square hole corresponding to the tool bit connection portion and the drive angle of the rotary tool is machined separately, it is difficult to suppress axial runout. Therefore, the present inventors discovered a way to accommodate both the tool bit connection portion and the drive angle of the rotary tool in a single square hole, and completed the present invention.

[0008] The present invention has been made to solve the above-mentioned problems, and is summarized as the following end tool unit and adapter.

[0009] (1) A tool end unit to be attached to a rotary tool having a prismatic first connection portion, a tool bit having a second connection portion in the shape of a rectangular pillar; an adapter for connecting the rotary tool and the tool bit; Equipped with the adapter has a through hole at one end into which the first connection portion is inserted and at the other end into which the second connection portion is inserted; The through hole has a rectangular hole portion that accommodates the first connecting portion and the second connecting portion.

[0010] (2) The tool bit has a cylindrical portion closer to the center than the second connecting portion, The end tool unit according to (1), wherein the through hole has the rectangular hole portion at one end and a circular hole portion at the other end for accommodating the cylindrical portion.

[0011] (3) The tool unit according to (1) or (2), wherein the tool is a cutting tool.

[0012] (4) An adapter for connecting a rotary tool having a prismatic first connection portion and a tool bit having a prismatic second connection portion, a through hole into which the first connection part is inserted at one end and into which the second connection part is inserted at the other end; The through hole has a rectangular hole portion that accommodates the first connecting portion and the second connecting portion.

[0013] (5) The tool bit has a cylindrical portion closer to the center than the second connecting portion, The adapter according to (4), wherein the through hole has the rectangular hole portion at one end and a circular hole portion at the other end for accommodating the cylindrical portion. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a tool tip unit and an adapter in which a tool tip can be easily attached to and detached from the adapter. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic view showing an end tool unit and an impact wrench according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic view showing a tool tip according to one embodiment of the present invention. [Figure 3]FIG. 3 is a schematic diagram illustrating an adapter according to an embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram illustrating an inner member of an adapter according to one embodiment of the present invention. [Figure 5] FIG. 5 is a schematic diagram illustrating an inner member of an adapter according to one embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram illustrating an outer member of an adapter according to one embodiment of the present invention. [Figure 7] FIG. 7 is a schematic view showing a method for attaching and detaching the tip tool and the adapter according to one embodiment of the present invention. [Figure 8] FIG. 8 is a schematic view showing a method for attaching and detaching the adapter and the impact wrench according to one embodiment of the present invention. [Figure 9] FIG. 9 is a schematic view showing a method for attaching and detaching a tool tip and an adapter according to another embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram showing an example of a square drive. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to an end tool unit that is attached to a known impact wrench.

[0017] [1. Impact wrench] First, a brief description of the impact wrench will be given. Fig. 1 is a schematic diagram showing an end tool unit and an impact wrench according to one embodiment of the present invention.

[0018] As shown in FIG. 1, the impact wrench 100 has a first connecting portion 102. Although not shown, a motor for rotating the first connecting portion 102 is provided within the impact wrench 100. The first connecting portion 102 has a square prism shape with chamfered corners, and a hole 102a is formed in a first pair of parallel surfaces. Note that a hole 102a may also be formed in a second pair of surfaces perpendicular to the first pair of surfaces. For convenience of explanation, the surfaces on which the hole 102a is formed are referred to as side surfaces. However, since the first connecting portion 102 rotates, this does not specify the first pair of surfaces or the second pair of surfaces. The hole 102a is a through-hole for inserting a pin 85 (see FIG. 8(b)) to connect the adapter 20 (described later) to the first connecting portion 102. The end tool unit 1 is connected to the first connecting portion 102 and rotates in conjunction with the rotation of the first connecting portion 102. The specific internal configuration of the impact wrench 100 is the same as that of a conventional impact wrench, so a detailed description thereof will be omitted.

[0019] Next, a description will be given of an end tool unit 1 according to an embodiment of the present invention. As shown in FIG.

[0020] [2. Tip tool] First, the tool bit 10 will be described. Figure 2 is a schematic diagram showing the tool bit 10 according to one embodiment of the present invention. (a) is a front view of the tool bit 10, and (b) is an enlarged view of the AA cross section of (a). The tool bit 10 includes a tip portion 11, a second connecting portion 12, a cylindrical portion 13, a first groove 14, a second groove 15, and a first ring 80.

[0021] The tip portion 11 is formed at one end of the tool bit 10 in the axial direction X. The tip portion 11 may have any shape suitable for tool bits. In this embodiment, the tip portion 11 is reamer-shaped. However, the tip portion 11 is not limited to a reamer shape and may have various other shapes, such as cutting tools such as step drills or sockets for fastening bolts and nuts. However, if a commercially available impact socket or bit socket is used as the tool bit 10 with a socket-shaped tip portion 11, it cannot be directly attached to the adapter 20. In this case, it is preferable to use a square drive that can be connected to an impact socket or bit socket. Square drives will be described later. An example of a square drive that can be connected to an impact socket is one that has a square drive similar to that of an impact wrench on one end and a second connecting portion 12, a cylindrical portion 13, a first groove 14, a second groove 15, and a first ring 80 on the other end. An example of a square drive that can be connected to a bit socket is one that has a bit at one end and a second connecting portion 12, a cylindrical portion 13, a first groove 14, a second groove 15, and a first ring 80 at the other end.

[0022] The second connecting part 12 has a rectangular prism shape and is inserted into the adapter 20. Similar to the first connecting part 102, the second connecting part 12 has a third pair of surfaces formed by a pair of surfaces, and a fourth pair of surfaces formed by a pair of surfaces perpendicular to the third pair of surfaces. The second connecting part 12 only needs to have the same length of the sides of its rectangular cross section as the first connecting part 102 of the impact wrench 100.

[0023] The cylindrical portion 13 has a cylindrical shape and is inserted into the adapter 20. The cylindrical portion 13 is formed between the tip portion 11 and the second connecting portion 12 in the axial direction X. When the tool bit 10 is attached to the adapter 20, the cylindrical portion 13 is received in a circular hole portion 31a, which will be described later. The diameter of the cylindrical portion 13 may be equal to or greater than the diameter of the circumscribing circle of the second connecting portion 12.

[0024] The first groove 14 is formed to extend annularly along the circumferential direction of the cylindrical portion 13. As will be described later, when the tool bit 10 is attached to the adapter 20, a locking member 83 engages with the first groove 14.

[0025] The second groove 15 is formed to extend annularly along the circumferential direction at the other end of the bit 10 in the axial direction X. The second groove 15 accommodates a first ring 80.

[0026] In this embodiment, the first ring 80 is made of an elastically deformable material (such as rubber). As will be described later, when the tool bit 10 is inserted into the through hole 31 of the adapter 20, the first ring 80 comes into contact with the inner circumferential surface of the through hole 31 to temporarily secure the tool bit 10 to the adapter 20.

[0027] [3. Adapter] 3 is a schematic diagram of an adapter 20 according to one embodiment of the present invention. (a) is a front view of the adapter 20, and (b) is a cross-sectional view taken along line AA in (a). The adapter 20 is composed of an inner member 30, an outer member 50, a second ring 81, a third ring 82, a locking member 83, and a spring 84.

[0028] In this embodiment, the second ring 81 is made of an elastically deformable material (such as rubber) The second ring 81 is housed in a third groove 34 or a fourth groove 35, which will be described later.

[0029] The third ring 82 is made of an elastically deformable metal wire member and is housed in the first restriction portion 36, which will be described later.

[0030] The locking member 83 is a spherical member. The locking member 83 is housed in a first hole 32, which will be described later. In this embodiment, one locking member 83 is housed in each first hole 32. However, the number of locking members 83 housed in each first hole 32 is not limited.

[0031] The spring 84 is made of metal and is accommodated in a spring accommodating portion 53 (described later) so as to be expandable and contractible in the axial direction X.

[0032] Next, the inner member 30 will be described. Figure 4 is a schematic diagram of the inner member 30 of the adapter 20 according to one embodiment of the present invention. (a) is a front view of the inner member 30, and (b) is a partial cross-sectional view taken along line AA in (a). Figure 5 is a schematic diagram of the inner member of the adapter 20 according to one embodiment of the present invention. (a) is a side view of the inner member 30, and (b) is a partial cross-sectional view taken along line AA in (a).

[0033] As shown in Figures 4 and 5, the inner member 30 has a through hole 31, a first hole 32, an insertion hole 33, a third groove 34, a fourth groove 35, a first restricting portion 36, and a second restricting portion 37.

[0034] The through hole 31 is formed to penetrate from one side to the other side of the inner member 30 in the axial direction X. The through hole 31 has a circular hole portion 31a formed on one side in the axial direction X and a square hole portion 31b formed on the other side. The square hole portion 31b accommodates the first connecting portion 102 of the impact wrench 100 and the second connecting portion 12 of the tool bit 10. The circular hole portion 31a accommodates the cylindrical portion 13 of the tool bit 10. Note that the square hole portion 31b only needs to be a hole where the inner circumferential surface of the square hole portion 31b slides against the outer circumferential surfaces of the first connecting portion 102 and the second connecting portion 12 when the first connecting portion 102 and the second connecting portion 12 are accommodated in the square hole portion 31b. Note that the circular hole portion 31a only needs to be a hole where the inner circumferential surface of the circular hole portion 31a slides against the outer circumferential surface of the cylindrical portion 13 when the cylindrical portion 13 is accommodated in the circular hole portion 31a. Furthermore, the circular hole portion 31a only needs to have an inner diameter equal to or larger than the square cross section of the rectangular hole portion 31b.

[0035] The square hole portion 31b receives the second connecting portion 12 of the tool bit 10 from one side in the axial direction X, and receives the first connecting portion 102 of the impact wrench 100 from the other side. By inserting the second connecting portion 12 and the first connecting portion 102 into the square hole portion 31b rather than into separate holes, it is possible to prevent misalignment of the central axes between the tool bit 10, the adapter 20, and the impact wrench 100 due to machining misalignment during manufacturing.

[0036] Generally, the machining precision of a rectangular pillar is lower than that of a circular pillar, so rattles are likely to occur at the mating portion when a rectangular pillar and a rectangular hole are combined. For this reason, in this embodiment, by providing the circular hole portion 31a and the cylindrical portion 13, which are a combination of a circular pillar and a circular hole, in addition to the second connecting portion 12 and the rectangular hole portion 31b, which are a combination of a rectangular pillar and a rectangular hole, rattles can be suppressed when using a rotary tool.

[0037] The first hole 32 is a through-hole provided on one side of the inner member 30 in the axial direction X, penetrating in a direction perpendicular to the axial direction X. As will be described later, a locking member 83 is housed in the first hole 32. The first hole 32 has a larger diameter than the locking member 83 on the outer circumferential surface side of the inner member 30, and a smaller diameter than the locking member 83 on the inner circumferential surface side of the inner member 30. This configuration prevents the locking member 83 from falling off toward the through-hole 31.

[0038] The insertion hole 33 is a through hole provided on the other side of the inner member 30 in the axial direction X. As will be described later, when the first connecting portion 102 of the impact wrench 100 is inserted into the through hole 31, the pin 85 is housed in the insertion hole 33.

[0039] The third groove 34 is formed on the outer surface of the inner member 30 so as to extend annularly in the circumferential direction from the molding position of the insertion hole 33. As will be described later, when the adapter 20 is attached to the impact wrench 100, the second ring 81 is housed in the third groove 34, which prevents the pin 85 inserted into the insertion hole 33 from falling out, thereby preventing the adapter 20 from falling out of the impact wrench 100.

[0040] The fourth groove 35 is formed to extend annularly along the circumferential direction from the third groove 34 to one side in the axial direction X. As will be described later, the second ring 81 is accommodated in the fourth groove 35. Note that the depth of the fourth groove 35 is not particularly limited, but by making the fourth groove 35 shallower than the third groove 34, it is possible to prevent the second ring 81 from unintentionally moving from the third groove 34 to the fourth groove 35, causing the pin 85 and the impact wrench 100 to fall off.

[0041] The first restricting portion 36 is formed to extend annularly along the circumferential direction on one side in the axial direction X of the inner member 30. As will be described later, a third ring 82 is housed in the first restricting portion 36, and contact between the third ring 82 and the outer member 50 restricts movement of the outer member 50 to one side in the axial direction X.

[0042] The second restricting portion 37 is formed between the first restricting portion 36 and the fourth groove 35 in the axial direction X. The second restricting portion 37 comes into contact with the outer member 50, thereby restricting movement of the outer member 50 to the other side in the axial direction X.

[0043] Next, the outer member 50 will be described. Figure 6 is a schematic diagram showing the outer member of the adapter according to one embodiment of the present invention. (a) is a front view of the outer member 50, and (b) is a partial cross-sectional view taken along the line AA in (a).

[0044] As shown in FIG. 6, the outer member 50 has a mounting hole 51, a second hole 52, and a spring accommodating portion 53.

[0045] The mounting hole 51 is a circular through-hole that penetrates one end face and the other end face of the outer member 50 in the axial direction X. The adapter 20 is configured so that the inner member 30 is inserted into the mounting hole 51 of the outer member 50.

[0046] The second hole 52 is a through-hole provided on one side of the outer member 50 in the axial direction X, penetrating in a direction perpendicular to the axial direction X. As will be described later, a part of the locking member 83 is housed in the second hole 52. The second hole 52 has a smaller diameter than the locking member 83. With this configuration, it is possible to prevent the locking member 83 housed in the first hole 32 from falling off onto the outer surface side of the outer member 50.

[0047] The spring accommodating portion 53 has a recessed shape provided on the other side of the outer member 50 in the axial direction X so as to extend circumferentially from the inner surface of the outer member 50 toward the outside. A spring 84 is accommodated in the spring accommodating portion 53.

[0048] [4. How to attach and detach the tip tool and adapter] Next, a method for attaching and detaching the tool bit 10 to the adapter 20 will be described. Figure 7 is a schematic diagram showing a method for attaching and detaching the tool bit 10 to the adapter 20 according to one embodiment of the present invention. (a) is a schematic diagram showing the standard state of the adapter 20, (b) is a schematic diagram showing the state in which the tool bit 10 is inserted into the adapter 20 in the released state, and (c) is a schematic diagram showing the state in which the adapter 20 is returned to the standard state after the tool bit 10 is inserted into the adapter 20.

[0049] As shown in FIG. 7(a), a state in which the outer member 50 is biased to one side in the axial direction X by the spring 84 is defined as a reference state. At this time, the central axes of the second hole 52 of the outer member 50 and the first hole 32 of the inner member 30 are misaligned. Therefore, the first hole 32 is blocked by the outer member 50. Furthermore, in the reference state, the locking member 83 protrudes toward the through hole 31. Therefore, the outer peripheral surface of the tool bit 10 is caught on the locking member 83, and the second connecting portion 12 of the tool bit 10 cannot be inserted into the through hole 31.

[0050] 7(b), a state in which the central axis of the second hole 52 of the outer member 50 and the central axis of the first hole 32 of the inner member 30 are aligned is defined as a released state. In the released state, the locking member 83 can move from inside the first hole 32 toward the second hole 52. Therefore, the protrusion of the locking member 83 from the inner surface of the inner member 30 can be retracted, so that the tool bit 10 is not caught by the locking member 83, and the tool bit 10 can be attached to and detached from the through-hole 31.

[0051] Switching from the reference state to the released state can be performed by moving the outer member 50 to the other side in the axial direction X, and then rotating the outer member 50 along the inner member 30 to align the central axis of the second hole 52 with the central axis of the first hole 32. As a result, the locking member becomes movable into the second hole 52. Note that the step of moving the outer member 50 to the other side in the axial direction X and the step of rotating the outer member 50 along the inner member 30 can be performed in any order.

[0052] By configuring the adapter 20 to require two steps, namely, a step of moving the outer member 50 to the other side in the axial direction X and a step of rotating the outer member 50 along the inner member 30, in order to switch from the reference state to the released state, it is possible to prevent the adapter 20 from unintentionally entering the released state and the accessory tool 10 from falling off the adapter 20. Note that instead of the second hole 52, a groove capable of accommodating the locking member 83 may be provided on the inner surface of the outer member 50. In this case, by moving the outer member 50 to the other side in the axial direction X, the locking member 83 becomes movable into the groove, and therefore, similarly to the above, the protrusion of the locking member 83 from the inner surface of the inner member 30 can be retracted.

[0053] When attaching the tool bit 10 to the adapter 20, first, as shown in FIG. 7(b), the tool bit 10 is inserted into the through-hole 31 of the adapter 20, which is in the released state. Next, as shown in FIG. 7(c), the adapter 20 is set to the reference state. By setting the adapter 20 to the reference state after inserting the tool bit 10, the locking member 83 engages with the first groove 14 of the tool bit 10, and the tool bit 10 is attached to the adapter 20. When removing the tool bit 10 from the adapter 20, the adapter 20 is set to the released state, and then the tool bit 10 can be removed from the adapter 20 by pulling the tool bit 10 to one side in the axial direction X.

[0054] [5. How to attach and detach the adapter and impact wrench] Next, a method for attaching and detaching the adapter 20 to and from the impact wrench 100 will be described. Figure 8 is a schematic diagram showing a method for attaching and detaching the adapter 20 to and from the impact wrench 100 according to one embodiment of the present invention. (a) is a schematic diagram showing the state before the impact wrench 100 and the adapter 20 are attached, and (b) is a schematic diagram showing the state after the impact wrench 100 and the adapter 20 have been attached.

[0055] When attaching the adapter 20 to the impact wrench 100, first, insert the first connecting portion 102 of the impact wrench 100 into the through hole 31 of the adapter 20 from the other side in the axial direction X, align the insertion hole 33 of the adapter 20 with the hole 102a on the impact wrench 100 side, and insert the pin 85 into them.

[0056] Next, the second ring 81 is attached to the third groove 34. This prevents the pin 85 from falling out of the insertion hole 33 and the hole 102a. The adapter 20 is attached to the impact wrench 100 by inserting the pin 85 through the insertion hole 33 and the hole 102a.

[0057] Furthermore, when removing the adapter 20 from the impact wrench 100, first, the second ring 81 is moved from the third groove 34 to the fourth groove 35. Then, the pin 85 is removed from the insertion hole 33 and the hole 102a. This makes it possible to remove the adapter 20 from the impact wrench 100.

[0058] 6. Other Embodiments The attachment / detachment mechanism between the tool bit 10 and the adapter 20 of the tool accessory unit 1 may be configured to use a pin 85 or a second ring 81, similar to the attachment / detachment mechanism between the adapter 20 and the impact wrench 100. By configuring the attachment / detachment mechanism between the tool bit 10 and the adapter 20 in the same manner as the attachment / detachment mechanism between the adapter 20 and the impact wrench 100, the outer member 50, the third ring 82, the locking member 83, and the spring 84 become unnecessary. By simplifying the configuration of the tool accessory unit 1, manufacturing costs can be reduced.

[0059] FIG. 9 is a schematic diagram illustrating a method for attaching and detaching a tool bit 10a to an adapter 20a according to another embodiment of the present invention. (a) is a schematic diagram illustrating the state in which the tool bit 10a is inserted into the adapter 20a in the released state, and (b) is a schematic diagram illustrating the state in which the adapter 20a is returned to the reference state after the tool bit 10a is inserted into the adapter 20a. While FIG. 9 shows two locking members 83a and 83b housed in each first hole 32a, the number of locking members housed in each first hole 32a is not limited. As shown in FIG. 9, the locking member 83a is housed on the inner circumferential surface of the inner member 30a within the first hole 32a, and the locking member 83b is housed on the outer circumferential surface of the inner member 30a. The locking members 83a and 83b may have the same diameter or different diameters. For example, the locking member 83b may have a larger diameter than the locking member 83a.

[0060] The second hole 52a has a smaller diameter than the locking member 83b. With this configuration, the locking member 83b housed in the first hole 32a can be prevented from falling off onto the outer surface of the outer member 50a.

[0061] 9, the tool accessory unit 1a may be a tool accessory 10a having a third hole 16, which is a through-hole, in the second connecting portion 12a instead of the tool accessory 10 having the first groove 14 in the cylindrical portion 13. The third hole 16 is formed in a fifth pair of surfaces, which are a pair of parallel surfaces, of the second connecting portion 12a of the tool accessory 10a. The third hole 16 may also be formed in a sixth pair of surfaces, which are a pair of surfaces perpendicular to the fifth pair of surfaces.

[0062] First, as shown in Fig. 9(a), the adapter 20a is set to the released state, and then the tool bit 10a is inserted into the adapter 20a with the third hole 16 and the first hole 32a overlapping. Then, as shown in Fig. 9(b), the adapter 20a is set to the reference state, whereby the locking member 83 engages with the third hole 16 of the tool bit 10a, and the tool bit 10a is attached to the adapter 20a.

[0063] As shown in FIG. 9, when the second connecting portion 12a is provided with a shape for engaging the locking member 83, it is preferable that the shape be a through-hole like the third hole 16 rather than a circumferentially extending groove like the first groove 14. The diameter of the cylindrical portion 13a is equal to or greater than the diameter of the circumscribed circle of the second connecting portion 12a. In other words, the cross-sectional area of ​​the second connecting portion 12a is smaller than that of the cylindrical portion 13a. Therefore, if a groove shape like the first groove 14 is formed in the second connecting portion 12a, the cross-sectional area of ​​the groove portion would be further reduced, which could result in excessively low strength of the tool bit 10a. By providing a through-hole shape like the third hole 16 for engaging the locking member 83, the strength of the tool bit 10a can be maintained.

[0064] (About square drives) Below, we will explain square drives that can be connected to impact sockets or bit sockets. An example of a square drive that can be connected to an impact socket is one that has a square drive with a shape similar to that of an impact wrench at one end and a second connecting portion 12, a cylindrical portion 13, a first groove 14, a second groove 15, and a first ring 80 at the other end. Also, an example of a square drive that can be connected to a bit socket is one that has a bit at one end and a second connecting portion 12, a cylindrical portion 13, a first groove 14, a second groove 15, and a first ring 80 at the other end.

[0065] In particular, a square drive that can be connected to an impact socket will be described in detail. Figure 10 shows an example of a square drive. As shown in Figure 10, a square drive 90 has, for example, a third connection portion 91, a cylindrical portion 92, and a fifth groove 93 at one end for connecting to an impact socket, and a fourth connection portion 94, a cylindrical portion 95, and a sixth groove 96 at the other end. The third connection portion 91 and the fourth connection portion 94 have the same shape as the second connection portion 12, the cylindrical portion 92 and the cylindrical portion 95 have the same shape as the cylindrical portion 13, and the fifth groove 93 and the sixth groove 96 have the same shape as the first groove 14. The third connection portion 91 has a bottomed hole 91a, a spring (not shown), and a ball 92b in it, and the ball 92b protrudes from the insertion surface 91c of the third connection portion 91 due to the bias of the spring. A blind hole (a conical hole is shown) 91d is provided on another surface 91c of the insertion angle of the third connecting portion 91. The fourth connecting portion 94 has a through hole 94a in part of a surface 94c of the insertion angle.

[0066] For example, the ball 92b of the third connecting portion 91 is used to connect to an impact socket having a connecting portion with a recess such as a groove or hole inside. The blind hole 91d of the third connecting portion 91 is used to connect to an impact socket having a connecting portion with a ball protruding inside. The through hole 94a of the fourth connecting portion 94 is used to connect to an impact socket having a connecting portion that is connected by a pin and O-ring. Furthermore, since the third connecting portion 91 and the fourth connecting portion 94 are both shaped to be received in the rectangular hole portion 31b of the adapter 20, various types of impact sockets can be connected to the adapter 20. [Industrial Applicability]

[0067] According to the present invention, it is possible to provide a tool end unit and an adapter in which the tool end and the adapter can be easily attached and detached. [Explanation of symbols]

[0068] 1 Tip tool unit 10 Tip tools 11 Tip 12 Second connection part 13 Cylindrical section 14 First groove 15 Second groove 16 Hole 3 20 Adapter 30 Inner member 31 Through hole 32 Hole 1 33 Insertion hole 34 Third groove 35 4th groove 36 First Regulatory Department 37 Second Regulatory Department 50 Outer member 51 Mounting hole 52 2nd hole 53 Spring housing 80 First Ring 81 Second Ring 82 Third Ring 83 Locking member 84 Spring 85 pins 90 square drive 91 Third connection part 92 Cylinder 93 Groove 5 94 4th connection part 95 Cylinder 96 6th groove 91a Bottomed hole 92b sphere 91c Socket Surface 91d Bottomed hole 94a through hole 94c socket surface 100 impact wrench 102 First connection part

Claims

1. A tool end unit to be attached to a rotary tool having a prismatic first connection portion, a tool bit having a second connection portion in the shape of a rectangular pillar; an adapter for connecting the rotary tool and the tool bit; Equipped with the adapter has a through hole at one end into which the first connection portion is inserted and at the other end into which the second connection portion is inserted; The through hole has a rectangular hole portion that accommodates the first connecting portion and the second connecting portion.

2. the tool bit has a cylindrical portion closer to the center than the second connection portion, The tool unit according to claim 1 , wherein the through hole has the rectangular hole portion at one end and a circular hole portion at the other end for accommodating the cylindrical portion.

3. The tool unit according to claim 1 or 2, wherein the tool is a cutting tool.

4. An adapter for connecting a rotary tool having a prismatic first connection portion and a tool accessory having a prismatic second connection portion, a through hole into which the first connection part is inserted at one end and into which the second connection part is inserted at the other end; The through hole has a rectangular hole portion that accommodates the first connecting portion and the second connecting portion.

5. the tool bit has a cylindrical portion closer to the center than the second connection portion, The adapter according to claim 4 , wherein the through-hole has the rectangular hole portion at one end and a circular hole portion at the other end for accommodating the cylindrical portion.

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