Top tool unit and adapter

Abstract

The invention provides a tip tool unit and an adapter capable of easily attaching and detaching a tip tool to and from a rotary tool. A tip tool unit (1), which is attached to a rotary tool (100) having a prismatic first connection part (102), is provided with: a tip tool (10) having a prismatic second connection part; and an adapter (20) that connects the rotary tool (100) and the tip tool (10), the adapter (20) having a through-hole (31) into which the first connection part (102) is inserted at one end of the through-hole (31), the second connection part (12) is inserted at the other end of the through-hole (31), and the through-hole (31) having a square hole part (31b) that accommodates the first connection part (102) and the second connection part (12).

Description

TECHNICAL FIELD

[0001] The present application relates to a tip tool unit and an adapter. BACKGROUND

[0002] As a tip tool that drills a hole in a steel plate or adjusts the diameter of the hole, there is a drill. 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 a hole drilled by a drill. Such cutting tools exist in both manual and electric types. As a structure that enables a reamer or a drill to be attached to an impact wrench, for example, there is the structure described in Patent Literature 1.

[0003] The connecting structure described in Patent Literature 1 (hereinafter referred to as an "adapter") is provided with a housing portion into which a square insertion head of a rotary tool is inserted, and a fixing portion provided on the face of the housing portion on the side opposite the opening, which fixes a cutting member. The fixing portion is externally threaded, and is threadedly coupled to the internally threaded cutting member.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2015-223659 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In the case of drilling a hole in a steel plate or the like using a rotary tool, it is necessary to first install a step drill in the rotary tool to drill a hole, and then replace the step drill with a reamer in order to adjust the diameter of the hole. In addition, sometimes the reamer is further replaced with a reamer of a different diameter as the diameter of the hole is adjusted. In this way, in work using a rotary tool, it is necessary to replace various tip tools (hereinafter referred to as "tip tools") such as step drills, reamers, sleeves, and the like, which are connected to the rotary tool, during the work. From the viewpoint of shortening the work time, it is desirable to be able to easily perform the replacement of the tip tool with respect to the adapter. However, in the case where thread coupling based on a threaded member is assumed, there is a problem in that the tip tool is further tightened by the work of the rotary tool, and thus it is difficult to detach the tip tool.

[0009] Therefore, one of the objects of the present application is to provide a tip tool unit and an adapter that enable the tip tool to be easily attached and detached with respect to the rotary tool.

[0010] SOLUTION TO PROBLEM

[0011] The present inventors have studied a chucking structure employed in various tools, on the premise that a connecting portion identical in shape to a square insertion head of a rotary tool is employed as a connecting portion of a tip tool, in relation to a method of mounting the tip tool to the rotary tool by means other than screwing. However, if square holes corresponding to the connecting portion of the tip tool and the square insertion head of the rotary tool are machined separately, it is difficult to suppress axial play. Therefore, the present inventors have conceived that both the connecting portion of the tip tool and the square insertion head of the rotary tool are housed in one square hole, thereby completing the present invention.

[0012] The present invention has been achieved in order to solve the above problem, and its gist lies in the following tip tool unit and adapter.

[0013] (1) A tip tool unit which is assembled to a rotary tool having a first connecting portion of a prismatic shape, wherein

[0014] The tip tool unit has:

[0015] a tip tool having a second connecting portion of a prismatic shape; and

[0016] an adapter which connects the rotary tool and the tip tool,

[0017] the adapter has a through-hole into which the first connecting portion is inserted at one end of the through-hole and into which the second connecting portion is inserted at the other end of the through-hole,

[0018] the through-hole has a square hole portion which houses the first connecting portion and the second connecting portion.

[0019] (2) The tip tool unit according to (1), wherein

[0020] the tip tool has a cylindrical portion at a position on the central side of the tip tool than the second connecting portion,

[0021] the through-hole has the square hole portion at one end and has a circular hole portion which houses the cylindrical portion at the other end.

[0022] (3) The tip tool unit according to (1) or (2), wherein

[0023] the tip tool is a cutting tool.

[0024] (4) An adapter which connects a rotary tool having a first connecting portion of a prismatic shape and a tip tool having a second connecting portion of a prismatic shape, wherein

[0025] the adapter has a through-hole into which the first connecting portion is inserted at one end of the through-hole and into which the second connecting portion is inserted at the other end of the through-hole,

[0026] The through-hole has a square hole portion that accommodates the first connecting portion and the second connecting portion.

[0027] (5) The adapter according to (4), wherein

[0028] The tip tool has a cylindrical portion at a position on the central side of the tip tool from the second connecting portion,

[0029] The through-hole has the square hole portion at one end and a round hole portion that accommodates the cylindrical portion at the other end.

[0030] Effects of the Invention

[0031] According to the present application, a tip tool unit and an adapter in which a tip tool can be easily attached to and detached from the adapter can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic view showing a tip tool unit and an impact wrench of an embodiment of the present application.

[0033] Figure 2 is a schematic view showing a tip tool of an embodiment of the present application.

[0034] Figure 3 is a schematic view showing an adapter of an embodiment of the present application.

[0035] Figure 4 is a schematic view showing an inner side member of an adapter of an embodiment of the present application.

[0036] Figure 5 is a schematic view showing an inner side member of an adapter of an embodiment of the present application.

[0037] Figure 6 is a schematic view showing an outer side member of an adapter of an embodiment of the present application.

[0038] Figure 7 is a schematic view showing a method of attaching and detaching a tip tool to and from an adapter of an embodiment of the present application.

[0039] Figure 8 is a schematic view showing a method of attaching and detaching an adapter to and from an impact wrench of an embodiment of the present application.

[0040] Figure 9 is a schematic view showing a method of attaching and detaching a tip tool to and from an adapter of another embodiment of the present application.

[0041] Figure 10 is a schematic view showing an example of a square-shaped transmission member.

[0042] Explanation of reference numerals in the attached figures

[0043] 1. Top tool unit; 10. Top tool; 11. Top part; 12. Second connecting part; 13. Cylindrical part; 14. First groove; 15. Second groove; 16. Third hole; 20. Adapter; 30. Inner component; 31. Through hole; 32. First hole; 33. Insertion hole; 34. Third groove; 35. Fourth groove; 36. First limiting part; 37. Second limiting part; 50. Outer component; 51. Mounting hole; 52. Second hole; 53. Spring receiving part; 80. 1. Ring; 81. Ring 2; 82. Ring 3; 83. Locking component; 84. Spring; 85. Pin; 90. Square transmission component; 91. Third connecting part; 92. Cylindrical part; 93. Fifth groove; 94. Fourth connecting part; 95. Cylindrical part; 96. Sixth groove; 91a. Bottom hole; 91b. Ball; 91c. Square insert head surface; 91d. Bottom hole; 94a. Through hole; 94c. Square insert head surface; 100. Impact wrench; 102. First connecting part. Detailed Implementation

[0044] The tip tool unit of the present invention is used when mounted on a known impact wrench. Hereinafter, a tip tool unit according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0045] [1. Impact wrench]

[0046] First, let me briefly explain the impact wrench. Figure 1 This is a schematic diagram illustrating a top tool unit and an impact wrench according to one embodiment of the present invention.

[0047] like Figure 1 As shown, the impact wrench 100 has a first connecting portion 102. Although not shown in the figure, the impact wrench 100 includes a motor for driving the rotation of the first connecting portion 102. The first connecting portion 102 is a chamfered quadrangular prism shape, and a hole 102a is formed on a first surface formed by two parallel opposite surfaces. Furthermore, a hole 102a may also be formed on a second surface formed by two opposite surfaces orthogonal to the first surface. For ease of explanation, the surface with the hole 102a is referred to as the side surface, but since the first connecting portion 102 rotates, the first and second surfaces are not specifically designated. The hole 102a supplies a pin 85 (see reference 85) for connecting the adapter 20 (described later) to the first connecting portion 102. Figure 8 (b)) The through hole into which the tool is inserted. The top tool unit 1 is connected to the first connecting part 102 and rotates as the first connecting part 102 rotates. Furthermore, the specific internal structure of the impact wrench 100 is the same as that of conventional impact wrenches, so detailed description is omitted.

[0048] Next, the tip tool unit 1 of an embodiment of the present application will be described. As shown in Figure 1 The tip tool unit 1 of an embodiment of the present application is provided with a tip tool 10 and an adapter 20.

[0049] [2. Tip tool]

[0050] First, the tip tool 10 will be described. Figure 2 is a schematic view showing the tip tool 10 of an embodiment of the present application. Figure 2 (a) of FIG. 1 is a front view of the tip tool 10, Figure 2 (b) of FIG. 1 is Figure 2 the A-A cross section in (a) of FIG. 1 is a partial enlarged view. The tip tool 10 is provided with a tip end portion 11, a second connecting portion 12, a cylindrical portion 13, a first groove 14, a second groove 15, and a first ring 80.

[0051] The tip end portion 11 is formed at an end portion on one side in the axial direction X of the tip tool 10. The tip end portion 11 has an arbitrary shape of a tip tool. In the present embodiment, the tip end portion 11 is a reamer shape, but the tip end portion 11 is not limited to the reamer shape, and can be a shape of various tools such as a stepped drill, a sleeve shape for fastening of a bolt and a nut, or the like. However, in a case where a commercially available impact sleeve or a bit sleeve is used as the tip tool 10 having the sleeve shape as the tip end portion 11, it is not possible to directly mount it to the adapter 20. In this case, a square drive capable of achieving connection with the impact sleeve or the bit sleeve can be used. Regarding the square drive, it will be described later. As the square drive capable of achieving connection with the impact sleeve, a square drive having a square insertion head having the same shape as a square insertion head of an impact wrench at one end and having the second connecting portion 12, the cylindrical portion 13, the first groove 14, the second groove 15, and the first ring 80 at the other end can be exemplified. In addition, as the square drive capable of achieving connection with the bit sleeve, a square drive having a bit at one end and having the second connecting portion 12, the cylindrical portion 13, the first groove 14, the second groove 15, and the first ring 80 at the other end can be exemplified.

[0052] The second connecting portion 12 has a quadrangular prism shape, and is inserted into the adapter 20. The second connecting portion 12 is provided with a third pair of faces constituted by a pair of faces and a fourth pair of faces constituted by a pair of faces orthogonal to the third pair of faces, similarly to the first connecting portion 102. In addition, the length of the sides of the cross-sectional quadrangle of the second connecting portion 12 can be the same as the length of the sides of the cross-sectional quadrangle of the first connecting portion 102 of the impact wrench 100.

[0053] The cylindrical portion 13 has a cylindrical shape and is inserted into the adapter 20. The cylindrical portion 13 is formed between the tip end portion 11 and the second connecting portion 12 in the axial direction X. The cylindrical portion 13 is housed in the circular hole portion 31a described later when the tip end tool 10 is attached to the adapter 20. In addition, the diameter of the cylindrical portion 13 can be a diameter that is equal to or greater than the diameter of the circumscribed circle of the second connecting portion 12.

[0054] The first groove 14 is formed in the cylindrical portion 13 so as to extend in a ring shape along the circumferential direction. As described later, the locking member 83 engages with the first groove 14 when the tip end tool 10 is attached to the adapter 20.

[0055] The second groove 15 is formed in the end portion on the other side in the axial direction X of the tip end tool 10 so as to extend in a ring shape along the circumferential direction. The first ring 80 is housed in the second groove 15.

[0056] In the present embodiment, the first ring 80 is composed of a material that can be elastically deformed (rubber or the like). As described later, the first ring 80 is brought into contact with the inner circumferential surface of the through hole 31 when the tip end tool 10 is inserted into the through hole 31 of the adapter 20, thereby temporarily fixing the tip end tool 10 to the adapter 20.

[0057] [3. Adapter]

[0058] Figure 3 is a schematic view of the adapter 20 of an embodiment of the present application. Figure 3 (a) of is a front view of the adapter 20, Figure 3 (b) of is a side view of the adapter 20, Figure 3 is a cross-sectional view taken along A-A in (a) of the adapter 20. 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.

[0059] In the present embodiment, the second ring 81 is composed of a material that can be elastically deformed (rubber or the like). The second ring 81 is housed in the third groove 34 or the fourth groove 35 described later.

[0060] The third ring 82 is composed of a wire-shaped member made of a material that can be elastically deformed. The third ring 82 is housed in the first restriction portion 36 described later.

[0061] The locking member 83 is a spherical member. The locking member 83 is housed in the first hole 32 described later. In the present embodiment, one locking member 83 is housed in one first hole 32. In addition, the number of locking members 83 housed in the first hole 32 is not limited.

[0062] The spring 84 is composed of a metal and is housed in the spring housing portion 53 described later so as to be able to extend and contract in the axial direction X.

[0063] Next, the inner member 30 will be described. Figure 4is a schematic diagram of an inner member 30 of an adapter 20 of an embodiment of the present application. Figure 4 (a) of FIG. 10 is a front view of the inner member 30, Figure 4 (b) of FIG. 10 is a side view of the inner member 30, Figure 4 is a partial cross-sectional view of A-A in (a) of FIG. 10. Figure 5 is a schematic diagram of an inner member of an adapter 20 of an embodiment of the present application. Figure 5 (a) of FIG. 11 is a side view of the inner member 30, Figure 5 (b) of FIG. 11 is a front view of the inner member 30, Figure 5 is a partial cross-sectional view of A-A in (a) of FIG. 11.

[0064] As shown in Figure 4 and Figure 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 restriction portion 36, and a second restriction portion 37.

[0065] The through-hole 31 is formed so as to pass through the inner member 30 from one side to the other side in the axial direction X. The through-hole 31 has a round-hole portion 31a formed on one side in the axial direction X and a square-hole portion 31b formed on the other side in the axial direction X. The first connecting portion 102 of the impact wrench 100 and the second connecting portion 12 of the tip tool 10 are housed in the square-hole portion 31b. In addition, the cylindrical portion 13 of the tip tool 10 is housed in the round-hole portion 31a. Note that the square-hole portion 31b is only a hole in which the inner peripheral surface of the square-hole portion 31b and the outer peripheral surface of the first connecting portion 102 and the second connecting portion 12 slide against each other when the first connecting portion 102 and the second connecting portion 12 are housed in the square-hole portion 31b. In addition, the round-hole portion 31a is only a hole in which the inner peripheral surface of the round-hole portion 31a and the outer peripheral surface of the cylindrical portion 13 slide against each other when the cylindrical portion 13 is housed in the round-hole portion 31a. In addition, the round-hole portion 31a has an inner diameter of the cross-sectional quadrilateral or more of the square-hole portion 31b.

[0066] In the square-hole portion 31b, the second connecting portion 12 of the tip tool 10 is housed from one side in the axial direction X, and the first connecting portion 102 of the impact wrench 100 is housed from the other side in the axial direction X. By not making the holes for the insertion of the second connecting portion 12 and the first connecting portion 102 separate holes but by inserting both the second connecting portion 12 and the first connecting portion 102 into the square-hole portion 31b, it is possible to prevent the shift of the central axes among the tip tool 10, the adapter 20, and the impact wrench 100 due to the machining deviation at the time of manufacture.

[0067] Generally, the processing accuracy of a prism is lower than that of a cylinder, and thus, in a combination of a prism and a square hole, it is easy for the fitting portion to be shaken. Therefore, in the present embodiment, in addition to the second connecting portion 12 and the square hole portion 31b which are a combination of a prism and a square hole, the circular hole portion 31a and the cylindrical portion 13 which are a combination of a cylinder and a circular hole are provided, and thus, it is possible to suppress the shaking when the rotary tool is used.

[0068] The first hole 32 is a through hole provided on one side in the axial direction X of the inner member 30 and penetrating in a direction perpendicular to the axial direction X. As described later, the locking member 83 is housed in the first hole 32. The first hole 32 has a diameter larger than that of the locking member 83 on the outer peripheral surface side of the inner member 30 and has a diameter smaller than that of the locking member 83 on the inner peripheral surface side of the inner member 30. With this structure, it is possible to prevent the locking member 83 from falling out to the through hole 31 side.

[0069] The insertion hole 33 is a through hole provided on the other side in the axial direction X of the inner member 30. As described later, the pin 85 is housed in the insertion hole 33 in a state where the first connecting portion 102 of the impact wrench 100 is inserted into the through hole 31.

[0070] The third groove 34 is formed on the outer side surface of the inner member 30 so as to extend in a ring shape along the circumferential direction from the formed position of the insertion hole 33. As described later, the second ring 81 is housed in the third groove 34 when the adapter 20 is attached to the impact wrench 100, and the falling out of the pin 85 inserted into the insertion hole 33 is prevented, and thus, it is possible to prevent the adapter 20 from falling out from the impact wrench 100.

[0071] The fourth groove 35 is formed so as to extend in a ring shape along the circumferential direction from the third groove 34 toward one side in the axial direction X. As described later, the second ring 81 is housed in the fourth groove 35. In addition, 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 moving from the third groove 34 to the fourth groove 35 and causing the pin 85 and the impact wrench 100 to fall out.

[0072] The first restriction portion 36 is formed on one side in the axial direction X of the inner member 30 so as to extend in a ring shape along the circumferential direction. As described later, the third ring 82 is housed in the first restriction portion 36, and the movement of the outer member 50 toward one side in the axial direction X is restricted by the contact of the third ring 82 with the outer member 50.

[0073] The second restriction portion 37 is formed between the first restriction portion 36 and the fourth groove 35 in the axial direction X. The second restriction portion 37 restricts the movement of the outer member 50 toward the other side in the axial direction X by contacting the outer member 50.

[0074] Next, the outer member 50 will be described. Figure 6This is a schematic diagram showing the outer component of an adapter according to one embodiment of the present invention. Figure 6 (a) is the front view of the outer member 50. Figure 6 (b) is Figure 6 A partial sectional view of AA in (a).

[0075] like Figure 6 As shown, the outer component 50 has a mounting hole 51, a second hole 52, and a spring receiving portion 53.

[0076] Mounting hole 51 is a circular through hole extending axially in the X direction to one end face of the outer member 50 and the other end face. Adapter 20 is configured such that the inner member 30 is inserted into the mounting hole 51 of the outer member 50.

[0077] The second hole 52 is a through hole located on one side of the outer member 50 along the axial direction X, extending in a direction perpendicular to the axial direction X. As described later, a portion of the locking member 83 is received in the second hole 52. The second hole 52 has a diameter smaller than that of the locking member 83. With this structure, it is possible to prevent the locking member 83 received in the first hole 32 from falling off to the outer surface side of the outer member 50.

[0078] The spring receiving portion 53 is a concave shape on the other side of the outer member 50 along the axial X direction, extending circumferentially from the inner surface of the outer member 50 towards the outside. The spring receiving portion 53 houses the spring 84.

[0079] [4. Installation and removal methods for the top tool and adapter]

[0080] Next, the method for attaching and detaching the top tool 10 and the adapter 20 will be explained. Figure 7 This is a schematic diagram illustrating a method for attaching and detaching the top tool 10 and the adapter 20 according to an embodiment of the present invention. Figure 7 (a) is a schematic diagram showing the reference state of adapter 20. Figure 7 (b) is a schematic diagram showing the state in which the top tool 10 is inserted into the adapter 20 in the deactivated state. Figure 7 (c) is a schematic diagram showing the state in which adapter 20 is in the base state after the top tool 10 is inserted into adapter 20.

[0081] like Figure 7of (a), a state in which the outer member 50 is pressed by the spring 84 to one side in the axial direction X is set as a reference state. At this time, the center axis of the second hole 52 possessed by the outer member 50 is offset from the center axis of the first hole 32 possessed by the inner member 30. Therefore, the first hole 32 is blocked by the outer member 50. In addition, in the reference state, the locking member 83 protrudes to the through hole 31 side. Therefore, the outer peripheral surface of the tip tool 10 is caught by the locking member 83, and the second connecting portion 12 possessed by the tip tool 10 cannot be inserted into the through hole 31.

[0082] In addition, as shown in (b) of FIG. 6, a state in which the center axis of the second hole 52 possessed by the outer member 50 coincides with the center axis of the first hole 32 possessed by the inner member 30 is set as a release state. In the release state, the locking member 83 can move from the inside of the first hole 32 to the second hole 52 side. Therefore, the protrusion of the locking member 83 from the inner surface of the inner member 30 can be retracted, and therefore, the tip tool 10 is not caught by the locking member 83, and the tip tool 10 can be attached to or detached from the through hole 31. Figure 7

[0083] 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 coincide the center axis of the second hole 52 with the center axis of the first hole 32, switching from the reference state to the release state can be performed. As a result, a state in which the locking member can move to the second hole 52 is obtained. Further, the procedure of moving the outer member 50 to the other side in the axial direction X and the procedure of rotating the outer member 50 along the inner member 30 are not specific in order.

[0084] By being configured to require both the procedure of moving the outer member 50 to the other side in the axial direction X and the procedure of rotating the outer member 50 along the inner member 30 in order to switch from the reference state to the release state, it is possible to prevent the adapter 20 from becoming the release state by accident and the tip tool 10 from falling off from the adapter 20. Further, instead of the second hole 52, a groove capable of housing the locking member 83 can 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, a state in which the locking member 83 can move to the groove is obtained, and therefore, as described above, the protrusion of the locking member 83 from the inner surface of the inner member 30 can be retracted.

[0085] When the tip tool 10 is attached to the adapter 20, first, as shown in (b) of FIG. 6, the tip tool 10 is inserted into the through hole 31 of the adapter 20 that has become the release state. Next, as shown in (a) of FIG. 6, the outer member 50 is moved to the other side in the axial direction X. Then, as shown in (b) of FIG. 6, the outer member 50 is rotated along the inner member 30. As a result, the center axis of the second hole 52 coincides with the center axis of the first hole 32, and the tip tool 10 is locked to the adapter 20. Figure 7 Figure 7 ​​by the (c) shown, the adapter 20 becomes the reference state. By making the adapter 20 the reference state after the tip tool 10 is inserted, the locking member 83 engages with the first slot 14 that the tip tool 10 has, and the tip tool 10 is fitted to the adapter 20. Further, when the tip tool 10 is detached from the adapter 20, by making the adapter 20 the release state and then pulling the tip tool 10 to one side in the axial direction X, the tip tool 10 can be detached from the adapter 20.

[0086] [5. Method of attaching and detaching the adapter and the impact wrench]

[0087] Next, the method of attaching and detaching the adapter 20 and the impact wrench 100 will be described. Figure 8 is a schematic view showing the method of attaching and detaching the adapter 20 and the impact wrench 100 according to an embodiment of the present application. Figure 8 (a) of the (a) is a schematic view showing the state before the impact wrench 100 and the adapter 20 are fitted, Figure 8 (b) of the (b) is a schematic view showing the state after the impact wrench 100 and the adapter 20 are fitted.

[0088] When the adapter 20 is attached to the impact wrench 100, first, the first connecting portion 102 that the impact wrench 100 has is inserted into the through-hole 31 that the adapter 20 has from the other side in the axial direction X, the insertion hole 33 that the adapter 20 has is overlapped with the hole 102a on the impact wrench 100 side, and the pin 85 is inserted into the insertion hole 33 and the hole 102a.

[0089] Next, the second ring 81 is attached to the third slot 34. By this, the pin 85 can be prevented from falling out of the insertion hole 33 and the hole 102a. By inserting the pin 85 across the insertion hole 33 and the hole 102a, the adapter 20 is attached to the impact wrench 100.

[0090] Further, when the adapter 20 is detached from the impact wrench 100, first, the second ring 81 is moved from the third slot 34 to the fourth slot 35. Then, the pin 85 is pulled out of the insertion hole 33 and the hole 102a. By this, the adapter 20 can be detached from the impact wrench 100.

[0091] [6. Other Embodiments]

[0092] The tip tool unit 1 can also make the attachment and detachment mechanism of the tip tool 10 and the adapter 20 and the attachment and detachment mechanism of the adapter 20 and the impact wrench 100 the same structure using the pin 85 and the second ring 81. By making the attachment and detachment mechanism of the tip tool 10 and the adapter 20 the same structure as the attachment and detachment mechanism of the adapter 20 and the impact wrench 100, the outer member 50, the third ring 82, the locking member 83, and the spring 84 are no longer needed. By simplifying the structure of the tip tool unit 1, the manufacturing cost can be reduced.

[0093] Figure 9 This is a schematic diagram illustrating the method of attaching and detaching the top tool 10a and the adapter 20a according to another embodiment of the present invention. Figure 9 (a) is a schematic diagram showing the state in which the top tool 10a is inserted into the adapter 20a in the deactivated state. Figure 9 (b) is a schematic diagram showing the state in which adapter 20a is in its base state after the top tool 10a is inserted into adapter 20a. It should be noted that... Figure 9 In this configuration, two locking members 83a and 83b are housed in a first hole 32a, but the number of locking members housed in the first hole 32a is not limited. Additionally, as... Figure 9 As shown, locking member 83a is received on the inner peripheral surface of inner member 30a within the first hole 32a, and locking member 83b is received on the outer peripheral surface of inner member 30a within the first hole 32a. Furthermore, locking members 83a and 83b may have the same diameter or different diameters. For example, locking member 83b may have a larger diameter than locking member 83a.

[0094] The second hole 52a has a smaller diameter than the locking member 83b. With this structure, it is possible to prevent the locking member 83b, which is housed in the first hole 32a, from falling off to the outer surface of the outer member 50a.

[0095] like Figure 9 As shown, in the tip tool unit 1a, instead of the tip tool 10 having a first groove 14 in the cylindrical portion 13, the tip tool 10a may have a third hole 16, which is a through hole, in the second connecting portion 12a. The third hole 16 is formed on the fifth surface of the second connecting portion 12a of the tip tool 10a, which is composed of two parallel opposite surfaces. Furthermore, the third hole 16 may also be formed on the sixth surface, which is composed of two opposite surfaces orthogonal to the fifth surface.

[0096] First, such as Figure 9 As shown in (a), after the adapter 20a is in the released state, the tip tool 10a is inserted into the adapter 20a with the third hole 16 overlapping the first hole 32a. Then, as... Figure 9 As shown in (b), by bringing the adapter 20a to a reference state, the locking member 83 engages with the third hole 16 of the tip tool 10a, and the tip tool 10a is fitted onto the adapter 20a.

[0097] In addition, such as Figure 9In the case where the shape for engagement of the locking member 83 is provided in the second connecting portion 12a as shown, it is preferable that the shape is a through-hole like the third hole 16, rather than a slot shape extending in the circumferential direction like the first slot 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 the cross-sectional area of the cylindrical portion 13a. Therefore, if a slot shape like the first slot 14 is formed in the second connecting portion 12a, the cross-sectional area is further reduced in the portion of the slot, and the strength of the tip tool 10a can become too low. By making the shape for engagement of the locking member 83 a through-hole like the third hole 16, the strength of the tip tool 10a can be maintained.

[0098] (Regarding the square drive)

[0099] Next, a square drive capable of achieving connection with an impact socket or a tool bit socket will be described. As a square drive capable of achieving connection with an impact socket, a square drive having a square insertion head having the same shape as the square insertion head of an impact wrench at one end and a second connecting portion 12, a cylindrical portion 13, a first slot 14, a second slot 15, and a first ring 80 at the other end can be exemplified. In addition, as a square drive capable of achieving connection with a tool bit socket, a square drive having a tool bit at one end and a second connecting portion 12, a cylindrical portion 13, a first slot 14, a second slot 15, and a first ring 80 at the other end can be exemplified.

[0100] In particular, a square drive capable of achieving connection with an impact socket will be described in detail. Figure 10 An example of a square drive is shown. As shown in Figure 10 The square drive 90 has, for example, a third connecting portion 91, a cylindrical portion 92, and a fifth slot 93 for connection with an impact socket at one end, and a fourth connecting portion 94, a cylindrical portion 95, and a sixth slot 96 at the other end. The third connecting portion 91 and the fourth connecting portion 94 have the same shape as the second connecting portion 12, the cylindrical portion 92 and the cylindrical portion 95 have the same shape as the cylindrical portion 13, and the fifth slot 93 and the sixth slot 96 have the same shape as the first slot 14. Furthermore, the third connecting portion 91 has a spring (omitted from the drawing) and a ball 91b inside a bottomed hole 91a, and the ball 91b protrudes from the surface 91c of the square insertion head of the third connecting portion 91 by the urging force of the spring. In addition, a bottomed hole (a conical hole is shown) 91d is provided on the other surface 91c of the square insertion head of the third connecting portion 91. The fourth connecting portion 94 has a through-hole 94a at a portion of the surface 94c of the square insertion head.

[0101] For example, the ball 91b of the third connecting portion 91 is used for connection with an impact sleeve having a connecting portion with a recess such as a groove or a hole inside. The bottomed hole 91d of the third connecting portion 91 is used for connection with an impact sleeve having a connecting portion with a ball protruding inside. The through hole 94a of the fourth connecting portion 94 is used for connection with an impact sleeve having a connecting portion connected by a pin and an O-ring. Also, both the third connecting portion 91 and the fourth connecting portion 94 are in the shape of the square hole portion 31b of the adapter 20, so various kinds of impact sleeves can be connected to the adapter 20.

[0102] Industrial Applicability

[0103] According to the present application, a tip tool unit and an adapter in which the tip tool and the adapter can be easily attached and detached can be obtained.

Claims

1. A tip tool unit which is assembled to a rotary tool having a first connecting portion in a prismatic shape, wherein the tip tool unit has: a tip tool having a second connecting portion in a prismatic shape; and an adapter which connects the rotary tool and the tip tool, the adapter has a through-hole in which the first connecting portion is inserted at one end of the through-hole and the second connecting portion is inserted at the other end of the through-hole, and the through-hole has a square hole portion which accommodates the first connecting portion and the second connecting portion.

2. The tip tool unit according to claim 1, wherein the tip tool has a cylindrical portion at a position on a central side of the tip tool than the second connecting portion, and the through-hole has the square hole portion at one end and a circular hole portion which accommodates the cylindrical portion at the other end.

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

4. An adapter which connects a rotary tool having a first connecting portion in a prismatic shape and a tip tool having a second connecting portion in a prismatic shape, wherein the adapter has a through-hole in which the first connecting portion is inserted at one end of the through-hole and the second connecting portion is inserted at the other end of the through-hole, and the through-hole has a square hole portion which accommodates the first connecting portion and the second connecting portion.

5. The adapter according to claim 4, wherein the tip tool has a cylindrical portion at a position on a central side of the tip tool than the second connecting portion, and the through-hole has the square hole portion at one end and a circular hole portion which accommodates the cylindrical portion at the other end. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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