Corner head structure and rivet tool including the same

Abstract

To provide a highly durable corner head.SOLUTION: A corner head structure includes a prime mover, a moved body, a bell crank, and a support pin. The prime mover and the moved body respectively include guide parts. The bell crank includes first and second guided parts and may rotate around an axis of the support pin. The first and second guided parts are configured to contact with the guide part of the prime mover and the guide part of the moved body respectively in a slidable manner. When the prime mover is moved in a first direction, the first guided part is guided by the guide part of the prime mover and moved in a second direction perpendicular to the first direction. Further, the bell crank rotates around the axis of the support pin and the second guided part is guided by the guide part of the moved body to be moved in a third direction different from the second direction. Furthermore, the moved body is moved in a fourth direction perpendicular to the third direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a corner head structure, and more particularly to a corner head structure that converts the direction of a rivet pulling force into a different direction. [Background technology]

[0002] A riveting tool is used when fastening components together with a rivet. When fastening a rivet using a riveting tool in a narrow space, the tip of the riveting tool cannot enter the narrow space and the rivet cannot be pulled, so a corner head is used on the riveting tool to change the direction of the force pulling the rivet to a different direction. For example, a corner head that changes the direction by 90 degrees is used.

[0003] In general, in a riveting tool, a bell crank mechanism is well known as a corner head mechanism for converting the direction of a force for pulling a rivet into a different direction. Specifically, the bell crank mechanism includes a driving body, a bell crank, and a driven body. The bell crank is plate-shaped and includes two long hole portions and a hole for passing a support pin through. The bell crank is rotatable around the axis of the support pin. The driving body is connected to one of the two long hole portions of the bell crank via a pin, and the driven body is connected to the other of the two long hole portions of the bell crank via another pin.

[0004] In the bell crank mechanism of this corner head, when the driving body is pulled in a certain direction, the pulling force is transmitted to the inner wall of the long hole to which the driving body of the bell crank is connected. Next, this transmission of pulling force causes the bell crank to rotate around the axis of the support pin. Furthermore, this rotation causes the pulling force to be transmitted to the inner wall of the long hole to which the driven body of the bell crank is connected. Finally, this transmission of pulling force causes the pulling force to be transmitted from the inner wall of the long hole to which the driven body of the bell crank is connected to the driven body, and a force pulling the driven body acts in a direction different from the direction of the force pulling the driving body. By using a corner head equipped with such a bell crank mechanism, the direction of the force applied by the riveting tool to pull the rivet can be converted to a different direction.

[0005] In the above-mentioned operation of the bell crank mechanism, the pin connecting the driving body and the bell crank and the other pin connecting the bell crank and the driven body slide on the inner walls of the two corresponding long holes of the bell crank, which causes localized stress on the inner walls of the two long holes of the bell crank. Such localized stress can cause problems such as insufficient durability of the bell crank or insufficient strength of the bell crank when a corner head is used for a rivet with a high mandrel breaking strength.

[0006] Therefore, for corner heads used for riveting in narrow areas, there is a demand for a structure that can achieve higher durability than conventional bell crank mechanisms and can be used within the limited space inside the corner head. Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, an object of the present invention is to provide a corner head that is more durable than conventional corner heads. [Means for solving the problem]

[0008] The present invention has been made to solve such problems, and in one embodiment of the present invention, the corner head structure comprises a driving body, a driven body, a bell crank, and a support pin, the driving body and the driven body include guide portions, the bell crank includes first and second guided portions and is rotatable around the axis of the support pin, the first and second guided portions are in slidable contact with the guide portions of the driving body and the guide portions of the driven body, respectively, and is configured so that when the driving body is moved in a first direction, the first guided portion is guided by the guide portion of the driving body and moves in a second direction perpendicular to the first direction, the bell crank rotates around the axis of the support pin, the second guided portion is guided by the guide portion of the driven body and moves in a third direction different from the second direction, and the driven body moves in a fourth direction perpendicular to the third direction. With this configuration, whereas stress is applied locally to the inner wall of the long hole portion of a conventional corner head, stress is distributed to the first and second guided portions, making it possible to provide a highly durable corner head. Also, with this configuration, it is possible to provide a corner head that can be used to fasten rivets in locations closer to a wall surface than conventional corner heads. Furthermore, with this configuration, the distance that the rivet can be pulled with one pulling motion is greater than with conventional corner heads, making it possible to provide a corner head that can handle rivets that require a large pulling distance.

[0009] In another embodiment, in the corner head structure, the bell crank includes a bell crank body, and the bell crank body is configured to be coupled to the first and second guided portions via first and second connecting pins, respectively. With this configuration, whereas stress is applied locally to the inner wall of the long hole portion of a conventional corner head, stress is distributed to the first and second guided portions, making it possible to provide a highly durable corner head. Also, with this configuration, it is possible to provide a corner head that can be used to fasten rivets in locations closer to a wall surface than conventional corner heads. Furthermore, with this configuration, the distance that the rivet can be pulled with one pulling motion is greater than with conventional corner heads, making it possible to provide a corner head that can handle rivets that require a large pulling distance.

[0010] In another embodiment, the corner head structure is configured such that a surface of the first guided portion is in slidable surface contact with a guide portion of the driving body, and a surface of the second guided portion is in slidable surface contact with a guide portion of the driven body. With this configuration, the stress applied to the guided portion can be dispersed over the surface that contacts the guiding portion, and as a result, a corner head with even higher durability than other embodiments can be provided. Also, with this configuration, it is possible to provide a corner head that can be used to fasten rivets in locations closer to a wall surface than conventional corner heads. Furthermore, with this configuration, it is possible to provide a corner head that can pull a rivet a greater distance with one pulling motion than conventional corner heads, and that can handle rivets that require a large pulling distance. Effect of the Invention

[0011] According to the present invention, it is possible to provide a corner head having higher durability than conventional corner heads. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a rivet tool according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view of a corner head according to an embodiment of the present invention. [Diagram 3]3 is a cross-sectional view of the corner head taken along line AA in FIG. 2. [Figure 4] FIG. 2 is a perspective view of a bell crank of a corner head according to an embodiment of the present invention. [Diagram 5] FIG. 5 is a cross-sectional view of the bell crank taken along line BB in FIG. 4. [Figure 6] 4 is a cross-sectional view showing a state in the middle of the rivet pulling operation, in which the driving body is pulled in the -Y direction from the state shown in FIG. 3. [Figure 7] 7 is a cross-sectional view showing the state at the end of the rivet pulling operation, in which the driving body is further pulled in the -Y direction from the state shown in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a corner head 20 according to an embodiment of the present invention and a riveting tool 10 including the corner head 20 will be described with reference to the drawings.

[0014] (Rivet tool) FIG. 1 shows a perspective view of a riveting tool 10 including a corner head 20 according to an embodiment of the present invention. The corner head 20 can be attached to and detached from the riveting tool 10. The corner head 20 may be integral with the riveting tool 10. When the corner head 20 can be attached and detached as in this embodiment, the corner head 20 can be attached to and detached from an existing riveting tool 10. Furthermore, the corner head 20 can be attached to and detached from the riveting tool 10 even if the riveting tool 10 is pneumatic, hydraulic, electric, or the like. A rivet is inserted in the -Z direction from the tip of the nose unit 23 of the corner head 20.

[0015] (Corner Head) FIG. 2 shows a perspective view of a corner head 20 according to an embodiment of the present invention. FIG. 3 shows a cross-sectional view of the corner head 20 taken along line AA in FIG. 2. The corner head 20 includes a driving body 21, a driven body 22, and a bell crank 30. The driving body 21 includes a guide portion 24. The driven body 22 includes a guide portion 25. The guide portion 24 of the driving body 21 includes guide portions 24a and 24b. The guide portion 25 of the driven body 22 includes guide portions 25a and 25b. The bell crank 30 includes a first guided portion 32, as described below, which is configured to be in slidable contact with at least one of the guide portions 24a and 24b of the driving body 21. Bell crank 30 includes second guided portion 33 as described below, and second guided portion 33 is configured to be in slidable contact with at least one of guiding portions 25a, 25b of moved body 22. By using corner head 20 of this embodiment in riveting tool 10, the direction of the pulling force can be changed by an angle of 90°. Note that the angle of change is not limited to 90°, and it may be configured so that the direction of the pulling force can be changed by an angle of 45°, 120°, etc., for example.

[0016] (Bell crank) FIG. 4 shows a perspective view of a bell crank 30 according to an embodiment of the present invention. FIG. 5 shows a cross-sectional view of the bell crank 30 taken along line BB in FIG. 4. In the bell crank 30, the bell crank body 31 is connected to the first guided portion 32 via the first connecting pin 35. In the bell crank 30, the bell crank body 31 is connected to the second guided portion 33 via the second connecting pin 36. In this embodiment, the bell crank body 31, the first guided portion 32, and the second guided portion 33 are configured as an assembly as described above, but in other embodiments, they may be configured as an integral unit. In the bell crank 30, the support pin 34 is inserted into the bell crank body 31. The bell crank 30 can rotate around the axis of the support pin 34. Here, in Fig. 5, bell crank body 31 is shown with hatched and unshaded portions, but considering that Fig. 5 is a cross-sectional view taken along line BB in Fig. 4, it can be understood that the hatched portions of bell crank body 31 are portions where slits are not provided, and the unshaded portions of bell crank body 31 are portions where slits are provided. Note that, although the shapes of first and second guided parts 32, 33 in this embodiment are octagonal, the shapes are not important so long as first guided part 32 is in slidable contact with guide part 24 of driving body 21, and second guided part 33 is in slidable contact with guide part 25 of driven body 22, respectively.

[0017] (Corner head operation) 3, 6, and 7 show the states of the components in the corner head 20, which converts the pulling force in the -Y direction to a pulling force in the -Z direction by 90° in the operation of pulling a rivet with the rivet tool 10. The angle conversion by the corner head is not limited to 90°, and may be configured to convert the angle by, for example, 45°, 120°, etc. FIG. 3 shows the start state of the rivet pulling operation, FIG. 6 shows the state during the rivet pulling operation, and FIG. 7 shows the end state of the rivet pulling operation. Note that the state in FIG. 7 does not necessarily show the end state of the rivet pulling operation, and depending on the length of the target rivet, for example, the state shown in FIG. 6 may be the end state of the rivet pulling operation. In addition, in the state in FIG. 3, as described above, in this embodiment, the first guided portion 32 is in contact with the guide portions 24a and 24b of the driving body 21. At this time, it is sufficient that the first guided portion 32 is in contact with at least the guide portion 24a of the driving body 21.

[0018] Figure 6 shows a state in the middle of the rivet pulling operation where the driving body 21 is pulled in the -Y direction from the state in Figure 3. The state of operation within the corner head 20 at this time will be described below in comparison with the state in Figure 3.

[0019] The force pulling the driving body 21 moves the driving body 21 in the -Y direction. Since the driving body 21 includes the guide portions 24a, 24b, the guide portions 24a, 24b of the driving body 21 move in the -Y direction in the same manner as the driving body 21 moves in the -Y direction. In this embodiment, the first guided portion 32 is in contact with the guide portions 24a, 24b of the driving body 21, and therefore, as the guide portions 24a, 24b of the driving body 21 move in the -Y direction, the first guided portion 32 is guided by the guide portions 24a, 24b of the driving body 21 and moves in the -Z direction perpendicular to the -Y direction while sliding between the guide portions 24a, 24b of the driving body 21. In addition, the first guided portion 32 may be configured to come into contact with only one of the guide portions 24a, 24b, of the driving body 21, and to move in the -Z direction perpendicular to the -Y direction while sliding only against the guide portion 24a.

[0020] Due to the movement of first guided part 32 in the -Z direction, bell crank 30, which is connected to first guided part 32 via first connecting pin 35, rotates clockwise around the axis of support pin 34 as viewed toward the page (-X direction with reference to FIG. 4). The rotation of bell crank 30 transmits force to second guided part 33 in the -Z direction.

[0021] In this embodiment, the second guided portion 33 is in contact with the guide portions 25a and 25b of the driven body 22, and therefore the force is transmitted from the second guided portion 33 to the guide portion 25a of the driven body 22 in the -Z direction. Therefore, the guide portions 25a and 25b of the driven body 22 move in the -Z direction. At this time, the second guided portion 33 is guided by the guide portions 25a and 25b of the driven body 22 and moves in the +Y direction perpendicular to the -Z direction while sliding between the guide portions 25a and 25b of the driven body 22. The second guided portion 33 may be configured to be in contact with only the guide portion 25a, which is one of the guide portions 25a and 25b of the driven body 22, and to move in the +Y direction perpendicular to the -Z direction while sliding only with the guide portion 25a.

[0022] Since the moved body 22 includes the guide portions 25a and 25b, when the guide portions 25a and 25b move in the -Z direction, the moved body 22 similarly moves in the -Z direction.

[0023] Figure 7 shows the end of the rivet pulling operation, where the driving body 21 has been pulled further in the -Y direction from the state of Figure 6. The state of operation within the corner head 20 at this time will be described below in comparison with the state of Figure 6.

[0024] The force pulling the driving body 21 causes the driving body 21 to move further in the -Y direction. Since the driving body 21 includes the guide portions 24a, 24b, as the driving body 21 moves further in the -Y direction, the guide portions 24a, 24b of the driving body 21 also move further in the -Y direction. In this embodiment, since the first guided portion 32 is in contact with the guide portions 24a, 24b of the driving body 21, as the guide portions 24a, 24b of the driving body 21 move further in the -Y direction, the first guided portion 32 is guided by the guide portions 24a, 24b of the driving body 21 and moves in the +Z direction perpendicular to the -Y direction while sliding between the guide portions 24a, 24b of the driving body 21. In addition, the first guided portion 32 may be configured to come into contact with only one of the guide portions 24a, 24b, of the driving body 21, and to move in the +Z direction perpendicular to the -Y direction while sliding only against the guide portion 24a.

[0025] As the first guided part 32 moves in the +Z direction, the bell crank 30, which is connected to the first guided part 32 via the first connecting pin 35, rotates clockwise around the axis of the support pin 34 as viewed toward the page (the -X direction when referring to FIG. 4). The rotation of the bell crank 30 transmits a force to the second guided part 33 in the -Z direction.

[0026] In this embodiment, the second guided portion 33 is in contact with the guide portions 25a and 25b of the driven body 22, and therefore the force is transmitted from the second guided portion 33 to the guide portion 25a of the driven body 22 in the -Z direction. Therefore, the guide portions 25a and 25b of the driven body 22 move further in the -Z direction. At this time, the second guided portion 33 is guided by the guide portions 25a and 25b of the driven body 22 and moves in the -Y direction perpendicular to the -Z direction while sliding between the guide portions 25a and 25b of the driven body 22. The second guided portion 33 may be configured to move in the -Y direction perpendicular to the -Z direction while contacting only the guide portion 25a, which is one of the guide portions 25a and 25b of the driven body 22, and sliding only with the guide portion 25a.

[0027] Since the moved body 22 includes the guide portions 25a and 25b, as the guide portions 25a and 25b move further in the -Z direction, the moved body 22 similarly moves further in the -Z direction.

[0028] In the above-described operation, when attention is paid to the direction of movement of the first guided portion 32, the first guided portion 32 moves in the -Z direction in the transition from the state of Fig. 3 to the state of Fig. 6, and moves in the +Z direction in the transition from the state of Fig. 6 to the state of Fig. 7. Also, when attention is paid to the direction of movement of the second guided portion 33, the second guided portion 33 moves in the +Y direction in the transition from the state of Fig. 3 to the state of Fig. 6, and moves in the -Y direction in the transition from the state of Fig. 6 to the state of Fig. 7.

[0029] In the operation of pulling the rivet, as the driving body 21 moves in the -Y direction within the corner head 20, the driven body 22 moves in the -Z direction due to the operation described above, and as a result, the direction of the force pulling the rivet is changed by an angle of 90°.

[0030] 3, 6, and 7, first guided part 32 moves in a direction perpendicular to the direction of movement of driving body 21. Similarly, second guided part 33 moves in a direction perpendicular to the direction of movement of driven body 22. In addition, first and second guided parts 32, 33 are supported and connected by first and second connecting pins 35, 36, respectively, and have a degree of rotational freedom, so that bell crank 30 can always maintain a fixed angular posture.

[0031] In this embodiment, since the corner head converts by 90°, the movement direction of the second guided part 33 is configured to be perpendicular to the movement direction of the first guided part 32. However, in a corner head that converts by 120°, for example, the movement direction of the second guided part is configured to be 120° relative to the movement direction of the first guided part. [Explanation of symbols]

[0032] 10 Rivet Tool 20 Corner Head 21 Prime Mover 22 Subject 23 Nose unit 24(24a, 24b) Information section 25(25a, 25b) Information section 30 Bell crank 31 Bell crank body 32 First guided part 33 Second guided part 34 Support pin 35 First connecting pin 36 Second connecting pin

Claims

1. A corner head structure attached to a tool, The device includes a driving body, a driven body, a bell crank, and a support pin, The driving body and the driven body include a guide portion, the bell crank includes first and second guided portions and is rotatable about an axis of the support pin; the first and second guided parts are in slidable contact with a guide part of the driving body and a guide part of the driven body, respectively; When the driving body is moved in a first direction, the first guided portion is guided by the guide portion of the driving body and moves in a second direction perpendicular to the first direction, The bell crank rotates about the axis of the support pin; the second guided portion is guided by the guide portion of the movable body and moves in a third direction different from the second direction, The moved object moves in a fourth direction perpendicular to the third direction. It was configured as follows: Corner head construction.

2. The corner head structure according to claim 1 , wherein the bell crank includes a bell crank body, and the bell crank body is coupled to the first and second guided portions via first and second connecting pins, respectively.

3. 3. The corner head structure according to claim 1, wherein a surface of the first guided portion is in slidable surface contact with a guide portion of the driving body, and a surface of the second guided portion is in slidable surface contact with a guide portion of the driven body.

4. A rivet tool comprising the corner head structure according to claim 1 or 2.

5. A rivet tool comprising the corner head structure according to claim 3.

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