tools

Abstract

The present invention provides a means for temporarily holding a contact arm in an adjusted position, which facilitates assembly and dimensional control during manufacturing and allows for stable operation of the operating load. [Solution] The contact arm 18 has a first arm 20 that can engage with the trigger portion, a second arm 40 that extends from the first arm 20 in the driving direction and contacts the material to be driven, and a rotating portion 30 that is rotatable and connects the first arm 20 and the second arm 40. By rotating the rotating portion 30, the second arm 40 is configured to move relative to the first arm 20, and the rotation of the rotating portion 30 is restricted by magnetic force.

Description

Technical Field

[0001] The present disclosure relates to a driving tool for driving fasteners. In particular, it relates to a driving tool provided with a contact arm as a safety device, and capable of adjusting the driving depth of the fastener by expanding and contracting the contact arm.

Background Art

[0002] As this type of driving tool, one provided with a contact arm as a safety device is known. The tip of the contact arm protrudes from the tip of the nose portion that drives the fastener, and can be pressed against the material to be driven and pushed in a direction opposite to the driving direction of the fastener. The base end portion of this contact arm extends to near the trigger of the driving tool, and can be engaged with a lever or a switch that switches the validity / invalidity of the trigger operation. In the sign OFF state before the contact arm is pushed in, the trigger operation is invalid, and the driving operation is not executed even if the user operates the trigger. On the other hand, in the sign ON state where the contact arm is pushed in to a predetermined position, the trigger operation is valid, and when the operator operates the trigger, the driving operation is executed.

[0003] Also, a driving tool is known in which the contact arm is composed of two or more parts and the contact arm can be expanded and contracted. By the user adjusting the length of the contact arm, the distance between the tip of the nose portion and the material to be driven in the sign ON state changes, and the driving depth of the fastener can be adjusted.

[0004] The adjustment mechanism of the contact arm generally has a screw portion provided on a contact bolt which is a part of the contact arm, and is provided with a dial for rotating the contact bolt. By the user rotating this dial, the contact arm expands and contracts due to the screw action of the contact bolt.

[0005] In such contact arm adjustment mechanisms, there are known to be means for locking the contact arm in the adjusted position. For example, Patent Document 1 discloses a configuration in which a steel ball is housed in a hole formed on the lower surface of the dial and biased by a spring, and engages with a recess formed on the opposing surface of the dial, thereby preventing unintentional rotation of the dial and providing a click sensation when rotating it. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2002-346947 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, with the configuration using the steel ball described above, precise dimensional control between the dial and the recess was required, and there was a risk of the steel ball falling out if the dimensions were not correct. In addition, the steel ball had to be assembled while holding down the spring, which resulted in poor assembly during manufacturing.

[0008] Therefore, the present disclosure aims to provide a driving tool that allows for temporary holding of a contact arm in an adjusted position, is easy to assemble and control dimensions during manufacturing, and can stabilize the operating load. [Means for solving the problem]

[0009] A driving tool according to one aspect of the present disclosure is a driving tool for driving in fasteners, comprising: a nose portion having an injection path for fasteners; a drive mechanism for driving in fasteners supplied to the injection path; a trigger portion for operating the drive mechanism; and a contact arm slidably mounted with respect to the nose portion, which moves when pressed against a material to be driven in, and which enables the operation of the trigger portion, wherein the contact arm has a first arm that can engage with the trigger portion, a second arm extending from the first arm in the driving direction and in contact with the material to be driven in, and a rotating portion that is rotatably configured and connects the first arm and the second arm, wherein the second arm is configured to move relative to the first arm by rotating the rotating portion, and the rotation of the rotating portion is restricted by magnetic force. [Effects of the Invention]

[0010] According to this disclosure, since the rotation of the rotating part is controlled by magnetic force, there is no need to use steel balls as in conventional designs. Therefore, since no small parts are used and there is no need to press down on springs during assembly, assembly during manufacturing is easy. In addition, strict dimensional control is not required, and the operating load can be stabilized even with rough dimensional control. [Brief explanation of the drawing]

[0011] [Figure 1] This is a magnified view of the area around the nose of the driving tool. [Figure 2] This is a side view of the contact arm. [Figure 3] This is a cross-sectional view of AA. [Figure 4A] This is a cross-sectional view showing the internal structure of the rotating part. [Figure 4B] These are schematic diagrams illustrating the configuration near the opening edge of the housing section, (a) a diagram according to an embodiment, (b) a diagram relating to another embodiment 1, and (c) a diagram relating to another embodiment 2. [Figure 5] This is a longitudinal cross-sectional view of the area near the rotating part (when the contact arm is at its shortest length). [Figure 6]It is a longitudinal sectional view near the rotating part (when the contact arm is the longest). [Figure 7] It is a longitudinal sectional view near the rotating part according to Modification 1. [Figure 8] It is a longitudinal sectional view near the rotating part according to Modification 2. [Figure 9] It is a longitudinal sectional view near the rotating part according to Modification 3. [Figure 10] It is a longitudinal sectional view near the rotating part according to Modification 4. [Figure 11] It is a longitudinal sectional view near the rotating part according to Modification 5. [Figure 12] It is a longitudinal sectional view near the rotating part according to Modification 6 (when the contact arm is the shortest). [Figure 13] It is a longitudinal sectional view near the rotating part according to Modification 6 (when the contact arm is the longest). [Figure 14] It is a longitudinal sectional view near the rotating part according to Modification 7. [Figure 15] It is a cross-sectional view near the trigger according to Modification 8.

Embodiments for Carrying Out the Invention

[0012] Embodiments of the present invention will be described with reference to the drawings. In the following description, as shown in FIG. 1, the injection direction of the fastener is described as "downward", and the direction opposite to the downward direction is described as "upward".

[0013] As shown in FIG. 1, the driving tool 10 according to the present embodiment has a tool body 11 integrally provided with a body housing 12, a grip 13, and a nose portion 15. The body housing 12, the grip 13, and the nose portion 15 may be composed of separate members or the same member.

[0014] The body housing 12 incorporates a driving mechanism for driving out the fastener. The driving mechanism can use a well-known structure. For example, a driving mechanism that operates using compressed air, gas, electricity, etc. as a power source can be used.

[0015] The grip 13 is a rod-shaped part that the operator holds when using the fastening tool 10. The grip 13 extends from the rear of the body housing 12 in a direction approximately perpendicular to the body housing 12. A trigger 14, which can be operated by the operator, is provided at the front end of the grip 13. When this trigger 14 is operated while the sign is ON (as described later), the drive mechanism (such as a piston cylinder mechanism or spring mechanism) built into the body housing 12 is activated and the fastener is ejected.

[0016] The nose section 15 is integrally provided below the body housing 12. Inside this nose section 15, a fastener ejection path (not shown) is formed. Below the ejection path, an ejection port 42d, which will be described later, is provided. When the drive mechanism is activated, the fastener waiting in the ejection path is ejected from the ejection port 42d.

[0017] A contact arm 18 is attached to the nose portion 15. The contact arm 18 constitutes a safety mechanism to prevent malfunctions during the driving operation. The safety mechanism is a mechanism for controlling the fastener so that it is not driven out when the nose portion 15 is not pressed against the material to be driven. The contact arm 18 is provided so as to be slidable up and down relative to the nose portion 15. The contact arm 18 is constantly biased in the protruding direction (downward) by a biasing means such as a spring (not shown), and its tip protrudes below the nose portion 15. The contact arm 18 can be moved upward against the biasing force of the biasing means by pressing it against the material to be driven.

[0018] When the contact arm 18 is not pressed against the material to be driven, it is biased downward and protrudes. This state is the sign-off state, where the operation of the trigger 14 is disabled. Even if the trigger 14 is operated in the sign-off state, the fastener will not be ejected.

[0019] On the other hand, when the contact arm 18 is pressed against the material to be driven and moves upward to a predetermined position, it switches to a sign-on state where the trigger 14 can be operated. When the trigger 14 is operated in this sign-on state, the fastener is ejected.

[0020] Known means can be used to enable or disable the operation of the trigger 14. For example, as shown in Figure 15, a contact lever 14a may be rotatably mounted inside the trigger 14. The contact lever 14a is rotatable about a pivot point 14b provided inside the trigger 14 and is positioned to press a switch or valve (valve 14c in Figure 15) for operating the drive mechanism. When the sign is ON, the end of the contact lever 14a is held directly or indirectly by the contact arm 18. For example, a trigger engagement portion 20a formed on the upper end of the contact arm 18 engages with the lower surface of the contact lever 14a. When the trigger 14 is operated in this state, downward movement of the contact lever 14a is suppressed, so the contact lever 14a rotates in conjunction with the trigger 14. When the contact lever 14a rotates, the valve 14c for operating the drive mechanism is pushed upward and activated, and the drive mechanism is activated.

[0021] On the other hand, in the sign-off state, the contact lever 14a is not directly or indirectly held by the contact arm 18, and the end of the contact lever 14a is free. Therefore, even if the trigger 14 is operated, the contact lever 14a is not forced to rotate in conjunction with the trigger 14. If the contact lever 14a hits the valve 14c, the contact lever 14a will move downward, so the valve 14c will not be pushed in. In this way, the operating load of the trigger 14 is not transmitted to the switch or valve that operates the drive mechanism, so the drive mechanism does not operate even if the trigger 14 is operated.

[0022] Thus, the contact lever 14a is a movable member that is movably provided to take on a first position in which the operation of the trigger 14 is effective and a second position in which the operation of the trigger 14 is ineffective.

[0023] The safety mechanism using the contact lever 14a described above is merely one example. For example, a safety mechanism may be used in which the sign turns ON when the upper end of the contact arm 18 presses a microswitch. In such a configuration, the microswitch is a movable member that can move to take on a first position in which the operation of the trigger 14 is effective and a second position in which the operation of the trigger 14 is ineffective.

[0024] As shown in Figure 2, the contact arm 18 according to this embodiment is a unit consisting of multiple parts, and has a first arm 20, a second arm 40, and a rotating part 30.

[0025] The first arm 20 is a metal component connected to the tool body 11. The first arm 20 has an extension portion 21 and a connecting portion 22.

[0026] The extension portion 21 extends vertically from the vicinity of the trigger 14 to the vicinity of the rotating portion 30. The extension portion 21 is a part provided along the side surface of the body housing 12 and the nose portion 15 in order to connect the connection portion 22, which will be described later, to the vicinity of the trigger 14. The upper end of the extension portion 21 according to this embodiment is configured to be engageable with the trigger portion (a unit including the trigger 14 and contact lever 14a described above). For example, the extension portion 21 has a trigger engagement portion 20a that engages with the contact lever 14a described above. The trigger engagement portion 20a is provided at the upper end of the extension portion 21 and engages with the contact lever 14a when the sign is ON, thereby enabling the fastener driving operation by the trigger 14. The trigger engagement portion 20a may be provided integrally with the extension portion 21 or as a separate member.

[0027] The connecting portion 22 is a part positioned opposite the rotating portion 30, which will be described later. In this embodiment, the connecting portion 22 is formed in a roughly U-shape when viewed from the side and is provided near the lower end of the extension portion 21. The connecting portion 22 is connected to the rotating portion 30 and the second arm 40, which will be described later. As shown in Figure 2, the connecting portion 22 in this embodiment comprises an opposing portion 23 facing one surface (upper surface 30e) of the rotating portion 30 and a support portion 24 facing the other surface (lower surface 30f) of the rotating portion 30. The opposing portion 23 and the support portion 24 are positioned opposite each other so as to sandwich the rotating portion 30 from above and below, and hold the rotating portion 30 so as not to fall out in the vertical direction. The vertical distance between the opposing portion 23 and the support portion 24 is set to be slightly larger than the vertical height of the rotating portion 30. This play allows the rotating portion 30 to rotate smoothly.

[0028] As shown in Figure 4A, the opposing portion 23 is positioned opposite the rotating portion 30. Specifically, the lower surface (first seating surface 23d) of the opposing portion 23 and the upper surface 30e of the rotating portion 30 are positioned parallel to each other and facing each other.

[0029] As shown in Figure 5, a second restricting member 25 for temporarily holding the rotating part 30 is provided on this opposing part 23. Specifically, a housing part 23a is recessed in the first seating surface 23d facing the rotating part 30, and the second restricting member 25 is housed in this housing part 23a. The second restricting member 25 is fixed inside the housing part 23a. The housing part 23a is formed deeper than the length of the second restricting member 25, and the second restricting member 25 is fixed in a state where it is completely embedded inside the housing part 23a. In other words, the end face (bottom surface) of the second restricting member 25 is positioned further back than the first seating surface 23d.

[0030] The second restricting member 25 in this embodiment is made of a magnetic material (a ferromagnetic material such as a magnet). This second restricting member 25 attracts the first restricting member 38, which will be described later, and constitutes a temporary holding means that prevents the rotating part 30 from rotating unintentionally.

[0031] An isolation means 23b is provided at the opening edge of the housing section 23a described above. This isolation means 23b is for guiding the first regulating member 38 and the second regulating member 25 in the anti-adsorption direction when the rotating section 30 rotates while the first regulating member 38 and the second regulating member 25 are adsorbed together. The isolation means 23b changes the direction of the rotational motion of the rotating section 30 and acts on the first regulating member 38, thereby guiding the first regulating member 38 away from the second regulating member 25. This isolation means 23b also serves the purpose of restricting the rotation of the rotating section 30. As shown in Figure 4B(a), the isolation means 23b in this embodiment is a tapered portion inclined in the rotational direction of the rotating section 30 (circumferential direction centered on the contact bolt 41, which will be described later). As shown in Figures 4A, 4B, and 5, this isolation means 23b is formed in a mortar shape to widen the opening edge of the housing section 23a. The isolation means 23b is formed with an inclined surface so as to connect the exposed surface (lower surface) of the second restricting member 25 with the opening edge of the housing portion 23a.

[0032] In this embodiment, as shown in Figure 4B(a), the starting position L2 of the inclined surface of the isolation means 23b is set to a position deeper than the position L1 of the surface of the second restricting member 25 (the surface that adheres to the first restricting member 38). By setting it to this position, when the rotating part 30 rotates with the first restricting member 38 and the second restricting member 25 adhered to each other, the first restricting member 38 does not get caught on the opening edge of the housing part 23a, so it can rotate smoothly.

[0033] However, the configuration of the isolation means 23b is not limited to this, and as shown in Figure 4B(b), the starting position L2 of the inclined surface of the isolation means 23b may be set to a shallower position than the position L1 of the surface of the second restricting member 25 (the surface that adheres to the first restricting member 38). In this configuration, the tip of the first restricting member 38 may be tapered or rounded to provide the isolation means 38a on the first restricting member 38. That is, the isolation means 23b on the opposing portion 23 and the isolation means 38a on the first restricting member 38 may be provided.

[0034] Furthermore, as shown in Figure 4B(b), it is desirable that the starting position L3 of the isolation means 38a of the first regulating member 38 be shallower than the starting position L2 of the inclined surface of the isolation means 23b when the first regulating member 38 and the second regulating member 25 are attracted to each other. In other words, it is desirable that when the rotating part 30 rotates while the first regulating member 38 and the second regulating member 25 are attracted to each other, the isolation means 38a (tapered or R-shaped) of the first regulating member 38 strikes the corner of the starting position L2 of the inclined surface of the isolation means 23b.

[0035] Furthermore, as shown in Figure 4B(c), the isolation means 23b may not be provided on the opposing portion 23, and the isolation means 38a may be provided only on the first regulating member 38. In this case, it is desirable that the starting position L3 of the isolation means 38a of the first regulating member 38 is shallower than the position L4 of the opening edge of the housing portion 23a (the isolation means 38a is outside the housing portion 23a) when the first regulating member 38 and the second regulating member 25 are attracted to each other. That is, it is desirable that the isolation means 38a (tapered or R-shaped) of the first regulating member 38 contacts the corner of the opening edge of the housing portion 23a when the rotating portion 30 rotates while the first regulating member 38 and the second regulating member 25 are attracted to each other.

[0036] The housing section 23a is provided at an eccentric position from the rotation center of the rotating section 30. In this embodiment, there is one housing section 23a, and there is also one second restricting member 25 housed in the housing section 23a. However, multiple housing sections 23a and second restricting members 25 may be provided.

[0037] As shown in Figure 5, a through hole 23c is formed in the center of the opposing portion 23. A female thread is formed on the inner circumferential surface of this through hole 23c. A contact bolt 41, which will be described later, is inserted through this through hole 23c. The contact bolt 41 has a male thread (a threaded portion 41a, which will be described later) that engages with the female thread of the through hole 23c.

[0038] The second arm 40 is a member that extends from the first arm 20 toward the tip (downward). The second arm 40 extends vertically from the vicinity of the rotating part 30 to the tip of the nose part 15. The tip of the second arm 40 protrudes downward from the tip of the nose part 15 and can be pressed against the material to be driven in by the fastener. By pressing the tip of the second arm 40 against the material to be driven in, the contact arm 18 can be moved upward and the sign can be turned ON.

[0039] This second arm 40 has a contact bolt 41 and a tip arm 42. The contact bolt 41 and the tip arm 42 are connected to each other so as to be movable (rotatable).

[0040] The contact bolt 41 is a member that is rotatably and reciprocally held in the connection portion 22 of the first arm 20. As already described, the contact bolt 41 has a male thread that screws into a female thread formed in the through hole 23c of the connection portion 22, and is movable in the vertical direction by rotation. The contact bolt 41 is positioned so that its axis is in the vertical direction.

[0041] As shown in Figure 5, the contact bolt 41 comprises a threaded portion 41a, a rotating portion 41b, a flange portion 41c, and a connecting shaft portion 41e.

[0042] The threaded portion 41a is the part that screws into the female thread formed in the through hole 23c of the connecting portion 22. The threaded portion 41a is provided near the upper end of the contact bolt 41 and has a male thread formed on its outer circumference. When the contact bolt 41 rotates, the threaded action of this threaded portion 41a causes the contact bolt 41 to move up and down. Specifically, the contact bolt 41 is movable between the top dead center position shown in Figure 5 and the bottom dead center position shown in Figure 6.

[0043] The co-rotating portion 41b is the part to which the rotating portion 30, described later, is attached. In this embodiment, the co-rotating portion 41b is arranged continuously below the threaded portion 41a and is formed with a larger diameter than the threaded portion 41a. As shown in Figure 3, the co-rotating portion 41b has a non-circular cross-section and rotates integrally with the rotating portion 30 by engaging with the insertion hole 30b of the rotating portion 30. The outer circumferential cross-section of the co-rotating portion 41b in this embodiment is substantially the same shape as the inner circumferential cross-section of the insertion hole 30b, thereby suppressing looseness. The co-rotating portion 41b and the rotating portion 30 are engaged with each other so as to be movable in the vertical direction. Therefore, the contact bolt 41 and the rotating portion 30 rotate integrally, but are able to move relative to each other vertically.

[0044] The flange portion 41c is a part that is continuously positioned below the co-rotating portion 41b and is formed with a larger diameter than the co-rotating portion 41b. As shown in Figure 5, the upper surface of this flange portion 41c is a second seating surface 41d that can contact the lower surface 30f of the rotating portion 30. The second seating surface 41d forms a surface perpendicular to the axial direction (vertical direction) of the contact bolt 41. The second seating surface 41d is formed as a flat surface so that it can contact the lower surface 30f of the rotating portion 30 over a surface area.

[0045] The connecting shaft portion 41e is a portion that extends downward for attaching the tip arm 42. The connecting shaft portion 41e is located below the flange portion 41c. Near its lower end, the connecting shaft portion 41e is rotatably connected to the tip arm 42.

[0046] The tip arm 42 is a member that protrudes from the tip of the nose portion 15 in order to contact the material to be driven in. As shown in Figure 2, the tip arm 42 comprises a mounting portion 42a, a hanging portion 42b, and a contact portion 42c.

[0047] The mounting portion 42a is the part for attaching the contact bolt 41. The mounting portion 42a is formed in a cylindrical shape and rotatably holds the area near the lower end of the contact bolt 41 (connecting shaft portion 41e). This configuration prevents the tip arm 42 from rotating even if the contact bolt 41 rotates.

[0048] The hanging portion 42b is the part that extends downward from the mounting portion 42a. This hanging portion 42b is slidably engaged with the nose portion 15. This engagement guides the tip arm 42 to slide up and down along the nose portion 15.

[0049] The contact portion 42c is provided at the tip of the hanging portion 42b and is the part that contacts the material to be driven in. In this embodiment, the contact portion 42c constitutes the injection path of the fastener, and the injection port 42d of the fastener is formed at its tip. The injection path of the fastener is formed in a cylindrical shape with a constant inner diameter in order to stabilize the driving position of the fastener, and the injection port 42d is the opening of this injection path.

[0050] The rotating part 30 is a member rotatably provided at a position connecting the first arm 20 and the second arm 40 described above. In this embodiment, the rotating part 30 is made of a non-magnetic material (for example, synthetic resin). The rotating part 30 is provided so that it can be operated by the user, and can be formed, for example, as a dial that can be operated from the outside. By rotating this rotating part 30, the overall length of the contact arm 18 can be extended or retracted. The rotating part 30 is positioned so that its axis of rotation is in the vertical direction. Furthermore, the axis of rotation of the rotating part 30 coincides with the axis of rotation of the contact bolt 41.

[0051] The rotating part 30 according to this embodiment is formed in a substantially cylindrical shape. The outer circumference 30a of the rotating part 30 is exposed in an operable manner, and the user can rotate the outer circumference 30a by hand. As shown in Figure 3, the outer circumference 30a of the rotating part 30 has irregularities formed in the circumferential direction to facilitate operation.

[0052] Furthermore, the rotating part 30 has a through hole 30b that penetrates in the axial direction (up and down direction). The co-rotating portion 41b of the contact bolt 41 is inserted into this through hole 30b so as to be able to move up and down. As shown in Figure 3, the through hole 30b has a non-circular cross-section and is formed to engage with the co-rotating portion 41b. The through hole 30b in this embodiment has an engaging portion 30c that is formed in a linear shape in plan view, and when this engaging portion 30c engages with the outer circumferential surface of the co-rotating portion 41b, the rotating part 30 and the co-rotating portion 41b rotate together. Therefore, when the rotating part 30 is rotated, the contact bolt 41 also rotates in conjunction with it.

[0053] The rotating part 30 has an upper surface 30e facing the opposing part 23 of the first arm 20, and a lower surface 30f facing the support part 24 of the first arm 20. The vertical movement of the rotating part 30 is restricted by the opposing part 23 and the support part 24 of the first arm 20, and it cannot move up and down except for a small clearance. However, it can rotate around the contact bolt 41 as the axis of rotation.

[0054] As shown in Figures 3 to 5, the rotating part 30 is provided with a first restricting member 38. In this embodiment, the first restricting member 38 is housed in a holding hole 30d formed to open on the upper surface 30e of the rotating part 30. Multiple first restricting members 38 are arranged at regular intervals in the circumferential direction of the rotating part 30 (in the example of Figure 3, four first restricting members 38 are arranged). The number of first restricting members 38 can be set arbitrarily. For example, there may be one first restricting member 38 or multiple first restricting members 38. Increasing the number of first restricting members 38 increases the number of positioning options, thus providing a mechanism that allows for fine-tuning of the depth adjustment. The holding hole 30d is located eccentrically from the rotation center of the rotating part 30. The degree of eccentricity of the holding hole 30d (first restricting member 38) is set to be equal to the degree of eccentricity of the housing part 23a (second restricting member 25). In other words, as the rotating part 30 rotates to a predetermined position, the first restricting member 38 housed in the holding hole 30d and the second restricting member 25 housed in the housing part 23a face each other.

[0055] The first restricting member 38 is attracted to the second restricting member 25 by magnetic force. If the second restricting member 25 is a magnet, the first restricting member 38 may be a magnet or a ferromagnetic material such as a metal. Also, if the first restricting member 38 is a magnet, the second restricting member 25 may be a magnet or a ferromagnetic material such as a metal.

[0056] The first restricting member 38 is provided to restrict the rotation of the rotating part 30 by magnetic force. That is, as shown in Figure 5, when the rotating part 30 rotates to a predetermined angle, the first restricting member 38 and the second restricting member 25 come into contact with each other and attract each other. As a result, the rotating part 30 is temporarily held in that position, and the rotating part 30 will not rotate unless a certain force acts to rotate it.

[0057] Furthermore, it is also possible to assist the rotation of the rotating part 30 using the first restricting member 38 and the second restricting member 25. That is, the first restricting member 38 and the second restricting member 25 may attract each other to assist the rotation operation of the rotating part 30. In this embodiment, since the first restricting member 38 is positioned every 90 degrees when viewed in the circumferential direction of the rotating part 30, the rotating part 30 will stop precisely at every 90-degree interval even when the rotating part 30 is rotated appropriately.

[0058] As shown in Figure 4A, the first restricting member 38 in this embodiment is a pin inserted into the holding hole 30d of the rotating part 30. The first restricting member 38 is housed in the holding hole 30d so as to be vertically movable. In other words, the holding hole 30d of the rotating part 30 functions as a guide that guides the first restricting member 38 (pin) so as to be vertically movable. Therefore, as shown in Figure 5, when the first restricting member 38 and the second restricting member 25 face each other, the first restricting member 38 moves along the holding hole 30d and adheres to the second restricting member 25. With this configuration, when the rotating part 30 is rotated and the first restricting member 38 and the second restricting member 25 adhere to each other, the user can feel a click sensation. The direction of movement of the first restricting member 38 is perpendicular to the adhesion surfaces of the first restricting member 38 and the second restricting member 25. In this embodiment, the first restricting member 38 is guided to move by the holding hole 30d (guide portion), but it is not limited to this, and if the second restricting member 25 is made movable within the housing portion 23a, the second restricting member 25 may be guided to move by the housing portion 23a (guide portion).

[0059] Furthermore, the first restricting member 38 can extend and retract from the holding hole 30d. As shown in Figure 5, in this embodiment, when the first restricting member 38 and the second restricting member 25 are adsorbed together, the tip of the first restricting member 38 enters the interior of the housing 23a. This stabilizes the temporary fixing of the rotating part 30 and improves the effect of preventing unintentional rotation of the rotating part 30.

[0060] Furthermore, the already described isolation means 23b is provided at the opening edge of the housing portion 23a into which the tip of the first restricting member 38 enters. In this embodiment, the isolation means 23b is a tapered portion inclined in the direction of rotation of the rotating portion 30. That is, no matter which direction the rotating portion 30 rotates, the tip of the first restricting member 38 will come into contact with the tapered portion. Therefore, when the rotating portion 30 rotates while the first restricting member 38 and the second restricting member 25 are attracted to each other, the tip of the first restricting member 38 is guided downward along the isolation means 23b (tapered portion) and pulled away from the second restricting member 25. This allows the temporary fixing of the rotating portion 30 to be released smoothly. Note that, as shown in the variation in Figure 4B, the starting position of the inclination of the isolation means 23b can be set arbitrarily, and the taper angle of the isolation means 23b can also be set arbitrarily. By setting the isolation means 23b in this way, a load that restricts the rotation of the rotating portion 30 can be set. For example, the closer the taper angle of the isolation means 23b is to vertical, the higher the load that restricts the rotation of the rotating part 30. Therefore, the load that restricts the rotation of the rotating part 30 can be set according to the characteristics of the driving tool 10, such as its intended use and the strength of the impact during driving.

[0061] In this embodiment, an example in which the first restricting member 38 is movable has been described, but the second restricting member 25 may also be configured to be movable. In this case, when the first restricting member 38 and the second restricting member 25 are attracted to each other, the tip of the second restricting member 25 may enter the inside of the holding hole 30d of the rotating part 30. In addition, isolation means (means for guiding the first restricting member 38 and the second restricting member 25 in the anti-attraction direction when the rotating part 30 rotates while the first restricting member 38 and the second restricting member 25 are attracted to each other) may be provided at the opening edge of the holding hole 30d.

[0062] Furthermore, although a tapered portion was used as the isolation means 23b in this embodiment, the first restricting member 38 and the second restricting member 25 may be guided in the anti-adsorption direction by a different shape (such as a protrusion).

[0063] Furthermore, while the rotating part 30 in this embodiment is a dial that can be operated by the user, the configuration of the rotating part is not limited to this. For example, instead of the user directly operating the rotating part, the user may operate a separate operating part. In this case, the rotating part may rotate in conjunction with the user operating the operating part. Also, the rotating part may be operated with a tool such as a Phillips screwdriver.

[0064] As explained above, according to this embodiment, since the rotation of the rotating part 30 is restricted by magnetic force, there is no need to use steel balls as in conventional designs. Therefore, since no small parts are used and there is no need to press down on springs during assembly, assembly during manufacturing is easy. In addition, strict dimensional control is not required, and the operating load can be stabilized even with rough dimensional control.

[0065] Furthermore, some conventional contact arm adjustment mechanisms included a cantilevered claw that engaged with a groove on the outer circumference of the dial to restrict its rotation. This configuration, which temporarily holds the dial's position through claw engagement, is easier to assemble than a configuration using a steel ball. However, if there are problems with machining accuracy due to dimensional tolerances or molding deformation, the strength of the engagement between the claw and the dial changes, resulting in insufficient temporary holding or, conversely, holding being too strong and preventing the dial from rotating. In addition, the strength of the claw's engagement changes due to aging, which can lead to changes in the operating load over time.

[0066] In this respect, with the configuration of this embodiment, changes in the operating load due to aging deterioration are less likely to occur, so the operating load can be stabilized.

[0067] Furthermore, the first restricting member 38 and the second restricting member 25 generate a magnetic field in the rotation axis direction (vertical direction) of the rotating part 30. With this configuration, there is no need to place the first restricting member 38 and the second restricting member 25 on the outer circumference 30a of the rotating part 30, so the outer circumference 30a of the rotating part 30 can be exposed in an operable manner, making it easier to directly operate the rotating part 30.

[0068] In this embodiment, when the rotating part 30 is rotated in a direction that shortens the contact arm 18, the rotating part 30 is sandwiched between the first arm 20 and the second arm 40, thereby restricting the movement of the contact arm 18 in the shortening direction. Specifically, as shown in Figure 5, when the contact arm 18 is at its shortest length (in other words, when the contact bolt 41 is at top dead center), the upper surface 30e of the rotating part 30 abuts against the first seating surface 23d of the first arm 20, and the lower surface 30f of the rotating part 30 abuts against the second seating surface 41d of the second arm 40. That is, the rotating part 30 (dial) itself acts as a member that restricts movement, and the torque of the rotating part 30 is distributed and received by the two seating surfaces (first seating surface 23d and second seating surface 41d). With this configuration, torque can be received over a wide area, and excessive rotation of the rotating part 30 can be suppressed. By suppressing excessive rotation of the rotating part 30, the phenomenon of the screw seizing (the phenomenon in which the screw becomes stuck and cannot rotate in the opposite direction) can be suppressed.

[0069] Conventionally, there was only one seating surface, and a cushioning material such as an O-ring was placed on this single seating surface to prevent seizing. However, with this conventional structure, when oil adhered to the O-ring, radial friction was reduced and the axial force increased, and when the oil dried, friction increased when returning it, so the return torque increased and it became impossible to loosen.

[0070] In this respect, according to this embodiment, since the seating surface is increased, torque can be received over a wider surface area without increasing the diameter (contact area) of the rotating part 30. In other words, galling can be effectively prevented without increasing the size of the parts. Furthermore, since galling can be prevented without using O-rings, the number of parts can also be reduced.

[0071] Although the first arm 20 of this embodiment has been described as being entirely made of metal, it is not limited to this, and only a part of it may be made of metal. For example, only the connecting part 22 may be made of metal.

[0072] (Variation 1) In the above embodiment, the second restricting member 25 is housed in the housing portion 23a of the opposing portion 23, but instead, all or part of the opposing portion 23 may be used as the second restricting member 25. For example, as shown in Figure 7, the opposing portion 23 may be formed from a magnetic material such as metal, so that the opposing portion 23 itself becomes the second restricting member 25. Alternatively, the first restricting member 38 may be formed from a magnet.

[0073] In this case, a recess 23e may be provided in the first seating surface 23d, and the first restricting member 38 may engage with this recess 23e. If the first restricting member 38 is made of a magnet, the first restricting member 38 is always attracted to the first seating surface 23d, so the rotation of the rotating part 30 can be restricted. In addition, the first restricting member 38 enters and engages with the recess 23e by its own magnetic force, and the resistance with the inner circumferential surface of the recess 23e can be used to strengthen the restriction of rotation.

[0074] (Modification 2) In the above embodiment, the first restricting member 38 is housed in the holding hole 30d of the rotating part 30, but instead, all or part of the rotating part 30 may be used as the first restricting member 38. For example, as shown in Figure 8, the rotating part 30 may be made of a magnetic material such as metal, so that the rotating part 30 itself can be used as the first restricting member 38. Also, the second restricting member 25 may be made of a magnet.

[0075] In this case, a convex portion 31 may be provided on the upper surface 30e of the rotating portion 30, such that the convex portion 31 engages with the housing portion 23a of the opposing portion 23. The difference between the vertical distance between the opposing portion 23 and the support portion 24 and the vertical height of the rotating portion 30 may be set to be greater than or equal to the height of the convex portion 31. By setting the vertical clearance between the rotating portion 30 and the connecting portion 22 to be greater than or equal to the height of the convex portion 31, the rotating portion 30 can be rotated over the height of the convex portion 31. Furthermore, since the rotating portion 30 itself is attracted to the second restricting member 25, there is no need to construct the first restricting member 38 from a separate component, thus reducing the number of parts.

[0076] (Variation 3) In the above embodiment, the first restricting member 38 is housed in the holding hole 30d of the rotating part 30. Alternatively, a disc-shaped suction part 33 may be placed on the upper part of the rotating part 30, and all or part of this suction part 33 may be used as the first restricting member 38. For example, as shown in Figure 9, the suction part 33 may be fixed or rotatably positioned on the upper part of the rotating part 30 made of synthetic resin. The suction part 33 may be made of a magnetic material such as metal. The second restricting member 25 may also be made of a magnet.

[0077] In this case, a protrusion 33a may be provided on the surface of the suction portion 33 so that this protrusion 33a engages with the housing portion 23a of the opposing portion 23.

[0078] According to this modified version, since a magnetic material such as metal is used only in a part of the rotating part 30, the rotating part 30 can be made lighter compared to modified version 2.

[0079] (Modification 4) As shown in Figure 10, the first plate 35 may be fixed to the rotating part 30 to form the first restricting member, and the second plate 27 may be fixed to the opposing part 23 to form the second restricting member. The first plate 35 and the second plate 27 may be disc-shaped plates that are arranged facing each other.

[0080] Furthermore, at least one of the first plate 35 and the second plate 27 may be formed from a magnet. Alternatively, the first plate 35 or the second plate 27 that is not formed from a magnet may be formed from a magnetic material such as metal.

[0081] By ensuring that the smooth first and second regulating members attract each other across their surfaces, a stepless adjustment mechanism can be provided. Furthermore, because a wide surface area is available for magnetic force to act on, the positioning effect is high even without the need for an engagement structure involving protrusions and recesses.

[0082] (Variation 5) As shown in Figure 11, the first restricting member 38 and the second restricting member 25 may be configured to generate a magnetic field in a direction perpendicular to the rotation axis direction of the rotating part 30. For example, the first restricting member 38 may be provided so as to be exposed on the outer circumference of the rotating part 30. One or more of the first restricting members 38 are arranged at regular intervals in the circumferential direction of the rotating part 30. Furthermore, the opposing portion 23 of the first arm 20 may be provided at a position that can face the outer circumference 30a of the rotating part 30, and the second restricting member 25 may be provided on this opposing portion 23.

[0083] Furthermore, at least one of the first restricting member 38 and the second restricting member 25 may be made of a magnet. In addition, the first restricting member 38 or the second restricting member 25 that is not made of a magnet may be made of a magnetic material such as metal.

[0084] In this modified example, since the opposing portion 23 is not provided in the vertical direction, the contact arm 18 can be shortened, and the function of the present invention can be implemented even with a smaller driving tool 10.

[0085] (Experimental variation 6) In the above embodiment, the upper surface 30e of the rotating part 30 is in contact with the first seating surface 23d of the first arm 20, and the lower surface 30f of the rotating part 30 is in contact with the second seating surface 41d of the second arm 40. However, the torque of the rotating part 30 may be distributed and received by other means.

[0086] For example, as shown in Figures 12 and 13, when the rotating part 30 is rotated in a direction that shortens the contact arm 18, the rotating part 30 may be sandwiched between the first arm 20 and the second arm 40, thereby restricting the movement of the contact arm 18 in the shortening direction.

[0087] In this modified example, as shown in Figures 12 and 13, when the rotating part 30 rotates, the second arm 40 moves up and down instead of the contact bolt 41 moving up and down.

[0088] The first arm 20 rotatably supports the contact bolt 41 through a through hole 23c, but no internal threads are formed inside the through hole 23c. The contact bolt 41 is held in place by a retaining portion 41f provided near its upper end to prevent it from falling out of the through hole 23c.

[0089] The rotating part 30 is supported at its lower surface 30f by the flange portion 41c of the contact bolt 41. Because there is play between the rotating part 30 and the flange portion 41c, the rotating part 30 can rotate around the contact bolt 41 as an axis.

[0090] The contact bolt 41 has a threaded portion 41a formed below the flange portion 41c. The mounting portion 42a of the tip arm 42 is attached to this threaded portion 41a. Specifically, the threaded portion 41a of the contact bolt 41 engages with the female threaded portion 42e formed on the tip arm 42. When the contact bolt 41 rotates, the tip arm 42 moves up and down due to the screw action. The upper surface of the mounting portion 42a is a second seating surface 41d that can contact the rotating portion 30.

[0091] In this configuration, as shown in Figure 12, when the contact arm 18 is at its shortest length (in other words, when the tip arm 42 is at top dead center), the upper surface 30e of the rotating part 30 contacts the first seating surface 23d of the first arm 20, and the lower surface 30f of the rotating part 30 contacts the second seating surface 41d of the second arm 40. That is, the rotating part 30 (dial) itself acts as a member that restricts movement, and the torque of the rotating part 30 is distributed and received by the two seating surfaces (first seating surface 23d and second seating surface 41d). With this configuration, the torque can be received over a wide surface without increasing the diameter (contact area) of the rotating part 30, and excessive rotation of the rotating part 30 can be suppressed. By suppressing excessive rotation of the rotating part 30, the phenomenon of screw seizing (the phenomenon in which the screw is tightened and cannot be rotated in the opposite direction) can be suppressed.

[0092] (Example 7) As shown in Figure 14, the rod-shaped first restricting member 38 may be biased in the protruding direction by a biasing member 45 such as a spring. The first restricting member 38 is slidably housed inside a retaining hole 30d formed in the rotating part 30. The tip of the first restricting member 38 can extend and retract from the surface of the rotating part 30 and is biased in the protruding direction by the biasing member 45. The tip of the first restricting member 38 that protrudes from the surface of the rotating part 30 can enter a housing part 23a formed in the opposing part 23. When the first restricting member 38 enters the housing part 23a, the two engage, and the rotation of the rotating part 30 is restricted. When the rotating part 30 rotates, the first restricting member 38 is pushed into the retaining hole 30d against the biasing force of the biasing member 45, thereby releasing the restriction on the rotation of the rotating part 30.

[0093] In this embodiment, the second restricting member 25 is placed inside the housing section 23a. In this case, at least one of the first restricting member 38 and the second restricting member 25 may be made of a magnet, and the other may be made of a magnetic material such as metal. With this configuration, the rotation of the rotating section 30 can be restricted by magnetic force.

[0094] However, in this modified example, the materials of the first restricting member 38 and the second restricting member 25 may be other materials; that is, the rotation of the rotating part 30 does not necessarily have to be restricted by magnetic force. Even without using magnetic force, the rotation of the rotating part 30 can be restricted by the biasing force of the biasing member 45.

[0095] (Variation 8) In the embodiment described above, the opposing portion 28 on which the second restricting member 25 is positioned is provided on the first arm 20, but the second restricting member 25 and the opposing portion 28 may be provided in locations other than the first arm 20.

[0096] For example, as shown in Figure 15, the second restricting member 25 may be placed on the opposing portion 28 fixed to the body housing 12.

[0097] Furthermore, the configurations of the first arm 20 and the second arm 40 are not limited to the embodiments described above, but can be freely set as long as they fall within the scope of the claims.

[0098] For example, in the modified example shown in Figure 15, the first arm 20 is a sheet metal member bent into a roughly L-shape, and a trigger engagement portion 20a that can engage with the contact lever 14a is provided at its upper end. In addition, a connecting portion 22 that contacts the upper end of the second arm 40 is provided at the lower end of the first arm 20. The first arm 20 is pressed against the second arm 40 by a spring 20b, and the connecting portion 22 is in contact with the upper end of the second arm 40. This connecting portion 22 is not fixed to the second arm 40. Thus, the first arm 20 and the second arm 40 may be connected by bringing them into contact vertically.

[0099] In this embodiment, the contact bolt 41 engages with the first arm 20 at its upper end. The contact bolt 41 may only be in contact with the first arm 20, or it may be joined to it. Furthermore, the threaded portion 41a of the contact bolt 41 is screwed into a female thread formed on the inner circumferential surface of the mounting portion 42a of the tip arm 42. Because the contact bolt 41 and the tip arm 42 are joined by a screw, when the contact bolt 41 rotates, the tip arm 42 moves relative to the first arm 20. That is, when the rotating part 30 is operated and the rotating part 30 and the contact bolt 41 rotate together, the tip arm 42 moves up and down.

[0100] (others) This disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. For example, embodiments obtained by appropriately combining the technical means disclosed in different embodiments and modifications are also included in the technical scope of the present invention. [Explanation of Symbols]

[0101] 10 Driving tool 11 Tool body 12 Body Housing 13 Grips 14 Triggers 14a Contact lever (movable member) 14b Pivot 14c valve 15 Nose section 18 Contact Arms 20 First Arm 20a Trigger Engagement Part 20b Spring 21 Extension 22 Connection part 23 Opposing part 23a Storage area 23b Isolation measures 23c through hole 23d First seating surface 23e recess 24 Support part 25 Second Regulating Member 27. Second plate (second regulatory member) 30 Rotating part 30a outer periphery 30b Through hole 30c Engagement part 30d retaining hole 30e top 30f bottom surface 31 Convex part 33 Adsorption part (first regulating member) 33a Convex part 35. First plate (first regulating member) 38. First Regulating Member 38a Isolation measures 40. Second Arm 41 Contact bolt 41a Threaded part 41b Co-rotating part 41c Flange section 41d Second seating surface 41e Connecting shaft 41f Retaining part 42 Tip Arm 42a Mounting part 42b Hanging part 42c Contact part 42d injection port 42e Female thread section 45. Biasing member

Claims

1. It is a fastening tool for driving in fasteners. A nose section having an injection path for the zipper, A drive mechanism for driving in the fastener supplied to the injection path, A trigger unit that operates the aforementioned drive mechanism, A movable member is provided so as to be movable that it can take on a first position in which the operation of the trigger is effective and a second position in which the operation of the trigger is ineffective. A contact arm is provided so as to be slidable with respect to the nose portion and moves when pressed against the material to be driven in, Equipped with, The contact arm comprises a first arm that can engage with the movable member, a second arm that extends from the first arm in the driving direction and contacts the material to be driven, and a rotating part that is configured to be rotatable. By rotating the aforementioned rotating part, the second arm is configured to be movable relative to the first arm. The rotation of the aforementioned rotating part is restricted by magnetic force. Driving tool.

2. The first regulating member provided on the rotating part, A second restricting member is provided on an opposing part that is positioned opposite to the rotating part, Equipped with, The first restricting member and the second restricting member are magnetically attracted to each other. When the rotating part rotates to a predetermined position, the first restricting member and the second restricting member face each other and attract each other, thereby restricting the rotation of the rotating part. The driving tool according to claim 1.

3. The first restricting member and the second restricting member are configured to come into contact and attract each time the rotating part rotates by a predetermined angle. The driving tool according to claim 2.

4. At least one of the rotating portion or the opposing portion is provided with a guide portion that movably guides the first restricting member or the second restricting member, When the first restricting member and the second restricting member face each other, at least one of the first restricting member or the second restricting member moves along the guide portion and is attracted to the other. The driving tool according to claim 2.

5. The direction of movement of the first restricting member or the second restricting member is perpendicular to the suction surfaces of the first restricting member and the second restricting member. The driving tool according to claim 4.

6. When the rotating part rotates, the first regulating member and the second regulating member are separated from each other. The driving tool according to claim 4.

7. The first regulating member or the second regulating member has a recess into which the other can engage, The driving tool according to claim 4.

8. The first regulating member or the second regulating member engages with a recess formed in the rotating part or the opposing part. The driving tool according to claim 4.

9. The system includes a separation means that guides the first restricting member and the second restricting member in the anti-adsorption direction by changing the direction of rotational motion of the rotating part and acting on the first restricting member or the second restricting member. The driving tool according to claim 4.

10. The isolation means is a tapered portion or R portion inclined in the rotational direction of the rotating portion. The driving tool according to claim 9.

11. The aforementioned first regulating member is a pin inserted into the rotating part. The driving tool according to claim 2.

12. The rotating part is a dial that can be operated from the outside. The driving tool according to claim 2.

13. The first restricting member and the second restricting member generate a magnetic field in the direction of the rotation axis of the rotating part. The driving tool according to claim 2.

14. When the rotating part is rotated in a direction that shortens the contact arm, the rotating part is sandwiched between the first arm and the second arm, thereby restricting the movement of the contact arm in the shortening direction. The driving tool according to claim 1.

15. When the rotating part rotates, the second arm moves relative to the first arm due to a screw action. The driving tool according to claim 1.

16. It includes a contact bolt connecting the first arm and the second arm, The contact bolt has a male thread, and the first arm and the second arm are connected via the male thread. The rotating part and the contact bolt rotate together. The driving tool according to claim 15.

17. The male thread formed on the contact bolt is screwed into the female thread formed on the first arm. The driving tool according to claim 16.

18. The second arm comprises a contact bolt that engages with the first arm, and a tip arm that is screw-connected to the contact bolt. The rotating part and the contact bolt are configured to rotate together as a single unit. When the contact bolt rotates, the tip arm moves relative to the first arm. The driving tool according to claim 15.

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