Driving tool

Abstract

To provide a nail gun that can reliably regulate the continuous firing of consumables. [Solution] The nail gun 1 includes a trigger valve section 6 that operates the main valve section 5, a trigger section 7 that operates the trigger valve section 6, and a contact arm 81 that enables the trigger valve section 6 to be operated in cooperation with the operation of the trigger section 7. The trigger section 7 includes a trigger lever 70 that is rotatably supported with respect to the main body, a contact lever section 71 that is rotatably supported by the trigger lever and configured to engage with the contact arm 81 and the lower stem 62 of the trigger valve, and a first lever biasing member 74 that biases the contact lever section 71 to a position in which it engages with the contact arm 81. The main body 10 includes a restricting section 15 that restricts the movement of the contact lever section 71 to a position in which it engages with the contact arm 81.

Description

Technical Field

[0001] The present disclosure relates to an implanting tool for implanting a consumable into an implanting material.

Background Art

[0002] An implanting tool for driving out consumables such as screws and nails performs an implanting operation by the engagement between a contact part that is pressed against and moves on an implanting material and a contact lever that moves in conjunction with a trigger lever.

[0003] Conventionally, there is known a driving machine that can switch between single driving, which requires pulling the trigger lever once each time, and continuous driving, which allows continuous driving while the trigger lever is pulled, by changing the operation order of the trigger lever and the contact part.

[0004] When the trigger lever is pulled while the contact part is pressed against and moved on the implanting material, the contact lever engages with the trigger valve stem and is maintained in a retracted state, and a technique has been proposed to regulate continuous driving to single driving by not engaging with the contact part (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005] [[ID=XX]] [[ID=XX]]

Patent Document No. 1

Summary of Invention

Problems to be Solved by the Invention

[0006] However, in a structure where the contact lever is engaged with and maintained by the trigger valve stem, the contact surface between the contact lever and the trigger valve stem is small. Therefore, in order to hold the contact arm engaged with the tip of the trigger valve, precise dimensional settings and high machining accuracy are required. Furthermore, if a recess is provided in the trigger valve stem to ensure stable engagement, there is a possibility of insufficient strength. Moreover, if a lateral load is applied to the trigger valve stem when the contact lever is pressed by the trigger valve stem, not only will stress concentrate in the recess, but the sealing performance of the trigger valve stem will also deteriorate.

[0007] The present invention was made to solve these problems and aims to provide a driving tool that allows switching between continuous and single-shot operation by changing the operating order of the trigger lever and contact part, and that can reliably restrict the continuous firing of consumables when single-shot operation is performed. [Means for solving the problem]

[0008] To solve the above-mentioned problems, this disclosure provides a device comprising: a main body extending in the vertical direction; a handle provided on the main body and extending from the main body in a direction intersecting the main body; a main chamber for storing compressed air; a striking cylinder that moves a striking piston axially when compressed air stored in the main chamber is supplied; a main valve for opening and closing the communication between the striking cylinder and the main chamber; a trigger valve section for operating the main valve; a trigger section for operating the trigger valve section; and a contact section that is movably supported in the direction of impact by the striking piston and can operate the trigger valve in cooperation with the operation of the trigger section, wherein the contact section comprises a contact top that is pressed against the material to be driven, and a contact section connected to the contact top and engageable with the trigger section. The driving tool comprises a contact arm having a movable arm tip, a trigger valve section comprising a pilot valve that operates the main valve section and a trigger valve stem that controls the intake and exhaust of compressed air to switch the operation of the pilot valve, a trigger section comprising a trigger lever that is movably supported relative to the main body, a contact lever section that is movably supported on the trigger lever and configured to engage with the contact arm and the trigger valve stem of the trigger valve, and a lever biasing section that biases the contact lever section to a position where it engages with the contact arm by causing it to protrude into the movement path of the arm tip of the contact arm, and the main body comprising a restricting section that restricts the movement of the contact lever section to the position where it engages with the contact arm.

[0009] In this disclosure, when the contact top is pressed against the material to be driven and the driving tool is moved toward the material to be driven, the contact arm moves upward relative to the main body and the contact arm and the contact lever engage. Next, when the trigger lever is pulled, the trigger valve is activated by the cooperation of the contact lever and the trigger lever, and the activation of the trigger valve activates the main valve, which then ejects the consumable.

[0010] Furthermore, when the contact top is pressed against the material to be driven, and the contact arm moves upward relative to the main body, and then the trigger lever is pulled, the amount of movement of the contact lever portion to the position where it engages with the contact arm is restricted by the restricting portion. When the driving tool is moved away from the material to be driven, and the contact arm moves downward relative to the main body, the contact lever portion disengages from the position where it engages with the contact arm. Therefore, since the amount of movement of the contact lever to the position where it engages with the contact arm is restricted, even if the contact arm is moved upward after disengaging, the contact arm and contact lever cannot be re-engaged, and the trigger valve will not operate even if the driving tool is then moved closer to the material to be driven. [Effects of the Invention]

[0011] In this disclosure, when the contact top is pressed against the material to be driven, the driving tool is moved toward the material to be driven, and then the trigger lever is pulled, the consumable is ejected. However, even if the trigger is held down after ejection and the driving tool is moved toward or toward the material to be driven, the movement of the contact lever to the position where it engages with the contact arm is restricted by the restricting part, so the trigger valve does not operate and the consumable is not ejected.

[0012] This allows for the restriction of continuous ejection of consumables. Furthermore, by providing a restricting part on the main body that restricts the movement of the contact lever to the position where it engages with the contact arm, sufficient contact surface is ensured between the contact lever and the restricting part. This eliminates the need for machining or highly precise shaping of the small trigger valve stem, and does not require high precision in dimensional setting or machining accuracy. Therefore, it can be applied at a low cost. Moreover, strength can be ensured. Thus, the position of the contact lever can be reliably restricted. [Brief explanation of the drawing]

[0013] [Figure 1] This is a side cross-sectional view showing an example of a nail gun according to this embodiment. [Figure 2] It is an external side view showing an example of the nail driver of this embodiment. [Figure 3] It is a cross-sectional side view of the main part showing an example of the nail driver of this embodiment. [Figure 4] It is a perspective view of the main part showing an example of the nail driver of this embodiment. [Figure 5] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment. [Figure 6] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during continuous firing. [Figure 7] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during continuous firing. [Figure 8] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during continuous firing. [Figure 9] It is a cross-sectional side view of the main part showing an example of the operation of the trigger valve part 6. [Figure 10] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during single firing. [Figure 11] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during single firing. [Figure 12] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during single firing. [Figure 13] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during single firing. [Figure 14] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during single firing. [Figure 15] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during single firing. [Figure 16] It is a cross-sectional side view of the main part of the trigger part showing an example of the operation of the nail driver of this embodiment during single firing. [Figure 17] It is a cross-sectional side view of the main part of the trigger part showing a modified example of the nail driver of this embodiment. [Figure 18]It is a cross-sectional view of the main part side of the trigger part showing a modified example of the nail gun of this embodiment. [Figure 19] It is a cross-sectional view of the main part side of the trigger part showing an example of an operation that restricts continuous firing of the nail gun of the modified example. [Figure 20] It is a cross-sectional view of the main part side of the trigger part showing an example of an operation that restricts continuous firing of the nail gun of the modified example. [Figure 21] It is a cross-sectional view of the main part side of the trigger part showing an example of an operation that restricts continuous firing of the nail gun of the modified example.

Mode for Carrying Out the Invention

[0014] Hereinafter, with reference to the drawings, an embodiment of a nail gun as an example of a driving tool of the present invention will be described.

[0015] <Configuration Example of the Nail Gun of this Embodiment> FIG. 1 is a side cross-sectional view showing an example of the nail gun of this embodiment, FIG. 2 is an external side view showing an example of the nail gun of this embodiment, FIG. 3 is a cross-sectional view of the main part side showing an example of the nail gun of this embodiment, FIG. 4 is a perspective view of the main part showing an example of the nail gun of this embodiment, and FIG. 5 is a cross-sectional view of the main part side of the trigger part showing an example of the nail gun of this embodiment.

[0016] The nail gun 1 moves the driver 2 in the axial direction by using the air pressure of compressed air. The nail gun 1 drives a nail (not shown), which is a consumable, into a material to be driven by moving the driver 2 in the axial direction.

[0017] The nail gun 1 includes a main body part 10. The nail gun 1 is in a form that can be held by hand by a person, and includes a body part 10a to which some of various mechanical component parts described later are attached, and a handle part 11 to which some of various mechanical component parts are attached and which is gripped by hand. The body part 10a extends in the vertical direction along the axial direction of the driver 2.

[0018] The main body 10 has a handle portion 11 located near the middle of the body portion 10a along its extension direction. The handle portion 11 extends from the body portion 10a in a direction that intersects with the body portion 10a, which extends in the vertical direction. The main body 10 has an exterior made of resin, and the body portion 10a and the handle portion 11 are integrally formed. The nail gun 1 also has a nose portion 12. The nose portion 12 is attached to one side of the main body 10 along the extension direction of the body portion 10a.

[0019] As shown in Figure 1, the nail gun 1 is illustrated with the nose portion 12 facing downwards. One side along the extension direction of the body portion 10a, which is the direction in which nails are driven (not shown), is referred to as the lower side, and the other side along the extension direction of the body portion 10a is referred to as the upper side. In the nail gun 1, the downward direction is indicated by arrow D. Also, in the nail gun 1, the upward direction, opposite to the downward direction, is indicated by arrow U. The driver 2 has its axial direction aligned with the vertical direction and moves downwards and upwards. Also, in the nail gun 1, the direction in which the body portion 10a is provided along the direction in which the handle portion 11, which intersects with the vertical direction, extends is referred to as the front side, and the side opposite to the body portion 10a is referred to as the rear side. In the nail gun 1, the forward direction is indicated by arrow F, and the rear direction is indicated by arrow R. When viewing Figure 1, etc., with the direction in which the fuselage section 10a extends being considered as the vertical direction, the left side is the forward direction and the right side is the rear direction.

[0020] The nose section 12 includes an injection passage 12a into which nails are supplied, and an injection port 12b from which the nails supplied to the injection passage 12a are ejected.

[0021] The injection passage 12a extends along the vertical direction in which the driver 2 moves. The injection port 12b is formed by providing an opening at the lower end of the injection passage 12a along its extending direction.

[0022] The nail gun 1 includes a driving section 3 for driving nails into the material to be driven. The driving section 3 includes a striking cylinder 30 that moves the driver 2 in the axial direction, and a striking piston 30a that moves by the air pressure of compressed air supplied to the striking cylinder 30.

[0023] The striking cylinder 30 is located inside the body portion 10a and consists of a cylindrical space that extends in the vertical direction.

[0024] The striking cylinder 30 has a striking piston 30a inside. The striking piston 30a is made up of a disc shape, a cylindrical shape, or the like, which allows it to move inside the striking cylinder 30 in the vertical direction. The striking piston 30a is mounted in such a way that the driver 2 protrudes downward.

[0025] In the nail gun 1, the driver 2 moves along the axial direction in the directions of arrows D and U as the striking piston 30a moves vertically inside the striking cylinder 30.

[0026] As a result, the nail gun 1 uses the air pressure of compressed air supplied to the striking cylinder 30 to move the striking piston 30a along the axial direction downward, as indicated by arrow D, to drive the nail into the material to be driven.

[0027] The striking cylinder 30 is equipped with a bumper 30e at its axial lower end. The bumper 30e is made of an annular elastic body and is shaped to allow contact with the striking piston 30a. The striking piston 30a is movable downward to a position where it contacts the bumper 30e. The bottom dead center position of the striking piston 30a and the driver 2 is when the striking piston 30a contacts the bumper 30e. The bumper 30e is configured to be elastically deformable, and the bottom dead center positions of the striking piston 30a and the driver 2 move within the range in which the bumper 30e can be elastically deformed.

[0028] The nail gun 1 includes a main valve unit 5 that switches whether or not compressed air is supplied to the striking cylinder 30, a trigger valve unit 6 that operates the main valve unit 5, and a trigger unit 7 that operates the trigger valve unit 6. The nail gun 1 also includes a contact unit 8 that allows the trigger valve unit 6 to be operated in cooperation with the operation of the trigger unit 7. Furthermore, the nail gun 1 includes a feed unit 9 that feeds nails (not shown), which are consumables, to the nose unit 12, and a magazine 90 that stores the nails fed by the feed unit 9.

[0029] Furthermore, the nail gun 1 includes a main chamber 13 to which compressed air is supplied from an external air compressor (not shown). The main chamber 13 is located on the outer circumference of the striking cylinder 30 within the handle section 11 and the body section 10a connected to the handle section 11. In addition, the nail gun 1 includes an exhaust chamber 14 for exhausting the compressed air.

[0030] Furthermore, the nail gun 1 is equipped with a blowback chamber 33 that returns the striking piston 30a, which has moved to the bottom dead center position, to the top dead center position.

[0031] The main valve section 5 includes a head valve 50 that opens and closes the communication between the main chamber 13 and the striking cylinder 30, and a control chamber 51 that controls the opening and closing of the head valve 50 by exhausting compressed air.

[0032] The main valve section 5 is located in the upper part of the body section 10a, with a head valve 50 provided around the striking cylinder 30. The head valve 50 is supported so as to be movable in the vertical direction. The main valve section 5 is also located in the upper part of the body section 10a, with a control chamber 51 provided around the head valve 50.

[0033] The trigger valve section 6 includes a pilot valve 60 for opening and closing the control chamber 51, a trigger valve upper stem 61 for operating the pilot valve 60, and a trigger valve housing 63 into which the pilot valve 60 and the trigger valve upper stem 61 are inserted so as to be movable in the vertical direction. The nail gun 1 also includes a trigger valve lower stem 62 for operating the trigger valve upper stem 61. Furthermore, the trigger valve section 6 includes a trigger valve biasing member 64 that biases the trigger valve lower stem 62 via the trigger valve upper stem 61.

[0034] The trigger valve section 6, comprising a pilot valve 60, an upper trigger valve stem 61, and a trigger valve biasing member 64, is assembled to the trigger valve housing 63 and is located above the handle section 11 and above the body section 10a. The lower trigger valve stem 62 is located between the trigger section 7 and the upper trigger valve stem 61. In this embodiment, the lower trigger valve stem 62 is positioned between the body section 10a and the handle section 11. The pilot valve 60 and the upper trigger valve stem 61 are supported by the trigger valve housing 63 so as to be movable in the vertical direction. The lower trigger valve stem 62 is also supported so as to be movable in the vertical direction near the part where the handle section 11 connects to the body section 10a. Furthermore, the upper trigger valve stem 61 and the lower trigger valve stem 62 are biased downward by the trigger valve biasing member 64.

[0035] The trigger valve housing 63 includes an exhaust section 63a that is opened and closed by the vertical movement of the pilot valve 60.

[0036] The nail gun 1 is equipped with a connecting passage 67 that connects the trigger valve housing 63 and the control chamber 51 of the main valve section 5. The connecting passage 67 extends laterally from the upper end of the trigger valve housing 63 near the exhaust section 63a, connecting the space at the upper end of the trigger valve housing 63 to the control chamber 51.

[0037] The sign-on position is the position in which the trigger valve unit 6 is operable. That is, when the trigger valve upper stem 61 is moved downward to a predetermined position, compressed air is supplied from the main chamber 13 to the lower side of the pilot valve 60, causing the pilot valve 60 to move upward. When the pilot valve 60 moves upward, it closes the exhaust section 63a. When the trigger valve lower stem 62 is pushed upward by the operation of the trigger unit 7 described later, the trigger valve upper stem 61 is pushed upward by the trigger valve lower stem 62. When the trigger valve upper stem 61 moves upward by a predetermined amount, a passage is formed in which compressed air is exhausted from the trigger valve lower chamber formed below the pilot valve 60 to the exhaust chamber 14, and the exhaust of compressed air from the trigger valve lower chamber causes the pilot valve 60 to move downward. When the pilot valve 60 moves downward, the exhaust section 63a opens. As a result, compressed air is exhausted from the control chamber 51 through the connecting passage 67 to the exhaust chamber 14. In this way, the position where the trigger valve upper stem 61 moves upward by a predetermined amount and the pilot valve 60 moves downward is the sign-on position where the trigger valve unit 6 becomes operable.

[0038] The contact section 8 comprises a contact top 80 that protrudes below the nozzle 12b, a first contact arm 81a connected to the contact top 80, and a second contact arm 81b that can engage with the contact lever section 71 of the trigger section 7, which will be described later. The first contact arm 81a is an example of a contact arm and is supported by the nose section 12 so as to be movable relative to the vertical direction. The second contact arm 81b is also an example of a contact arm and is supported so as to be movable relative to the body section 10a in the vertical direction. The second contact arm 81b has an arm tip 81c at its upper end in the vertical direction that can engage with the contact lever section 71, which will be described later. The contact section 8 is biased downward by a biasing member 82 in the direction in which the contact top 80 protrudes below the nozzle 12b. As a result, the contact portion 8, when the contact top 80 is pressed against the material to be driven, causes the first contact arm 81a to push up the second contact arm 81b, and the second contact arm 81b moves upward relative to the body portion 10a. Note that the first contact arm 81a and the second contact arm 81b may be formed as a single unit.

[0039] The trigger unit 7 includes a trigger lever 70. The trigger lever 70 extends from the body portion 10a along the handle portion 11, and the end on the body portion 10a side is rotatably supported relative to the body portion 10a with the shaft portion 70a as a pivot point. The trigger unit 7 includes a trigger biasing member 70b that biases the trigger lever 70. The trigger biasing member 70b is made up of, for example, a coil spring, and biases the end of the trigger lever 70 that extends from the shaft portion 70a along the handle portion 11 in a direction away from the handle portion 11.

[0040] The trigger unit 7 includes a contact lever unit 71. The contact lever unit 71 includes a first lever 72 configured to engage with the contact arm 81 and the lower stem 62 of the trigger valve unit 6, and a second lever 73 that rotatably supports the first lever 72 relative to the trigger lever 70.

[0041] The first lever 72 extends in a direction along the trigger lever 70, and its rear portion, which is in a direction away from the shaft portion 70a along the extension direction of the handle portion 11, is connected to the second lever 73 by the first shaft portion 72a. The first lever 72 is rotatably supported relative to the second lever 73 about the first shaft portion 72a.

[0042] The second lever 73 is rotatably supported relative to the trigger lever 70 by a second shaft portion 73a. The second lever 73 extends from the second shaft portion 73a in a direction intersecting the first lever 72 and supports the first lever 72 via the first shaft portion 72a.

[0043] As a result, the contact lever section 71 has a first lever 72 and a second lever 73 that rotate relative to the trigger lever 70 with the second shaft portion 73a as the pivot point. Also, the contact lever section 71 has a first lever 72 that rotates relative to the second lever 73 via the first shaft portion 72a with the first shaft portion 72a as the pivot point.

[0044] The first lever 72 includes a trigger valve stem contact portion 72b for single-press actions, a trigger valve stem contact portion 72c for rapid-press actions, and a contact arm contact portion 72d.

[0045] The trigger valve stem contact portion 72b during single-tap operation is located on the upper side of the first lever 72, which is opposite to the trigger valve lower stem 62, and is closer to the lever tip portion 72g, opposite to the first shaft portion 72a.

[0046] The trigger valve stem contact portion 72c for rapid pressing is provided on the upper side of the first lever 72, facing the trigger valve lower stem 62, between the trigger valve stem contact portion 72b for single pressing and the first shaft portion 72a.

[0047] The contact arm contact portion 72d is provided on the lower side of the first lever 72, facing the contact arm 81, and on the side closer to the lever tip portion 72g.

[0048] The first lever 72 is provided with a contact portion 72e. The contact portion 72e is located on the lower side opposite to the side where the trigger valve stem contact portion 72b for single-tap activation, the trigger valve stem contact portion 72c for rapid-tap activation, and the contact arm contact portion 72d are provided, with the first shaft portion 72a in between, and is the side where the contact arm contact portion 72d is provided.

[0049] The first lever 72 is provided with a lever restrictor 72f. The lever restrictor 72f is provided on the upper surface of the first lever 72 facing the trigger valve lower stem 62, between the trigger valve stem contact portion 72b during single-tap action and the trigger valve stem contact portion 72c during rapid-tap action. The lever restrictor 72f is composed of a convex portion that protrudes upward to a predetermined height, allowing the trigger valve lower stem 62 to contact the upper surfaces of the trigger valve stem contact portion 72b during single-tap action and the trigger valve stem contact portion 72c during rapid-tap action.

[0050] The second lever 73 includes a restricted portion 73b. The restricted portion 73b is located on the side of the first shaft portion 72a that is away from the second shaft portion 73a, with respect to the second shaft portion 73a, and extends from the second shaft portion 73a in the direction of the first shaft portion 72a. The restricted portion 73b is the part that contacts the restricting portion 15, which will be described later, to restrict the rotation of the second lever 73. In this embodiment, the restricted portion 73b is formed by providing a convex portion at the end of the second lever 73 on the side where the first shaft portion 72a is provided. However, the restricted portion 73b may be located between the first shaft portion 72a and the second shaft portion 73a, as long as it can contact the restricting portion 15 and restrict rotation. The second lever 73 also includes a contact portion 73c. The contact portion 73c is configured such that a surface is provided between the second shaft portion 73a and the restricted portion 73b, facing the contact portion 72e of the first lever 72.

[0051] The contact lever portion 71 includes a first lever biasing member 74 that biases the first lever 72 relative to the second lever 73. The first lever biasing member 74 is an example of a biasing member, and is composed of, for example, a torsion coil spring, and biases the first lever 72 to a position where the contact portion 72e and the contacted portion 73c are in contact. That is, the first lever biasing member 74 biases the first lever 72 relative to the second lever 73 so that the first lever 72 rotates relative to the first shaft portion 72a as a pivot point, in a direction that increases the distance between the contact arm contact portion 72d and the second shaft portion 73a. As a result, the first lever 72 of the contact lever portion 71 is biased to a position where it can engage with the contact arm 81.

[0052] The trigger lever 70 includes a second lever biasing member 75 that biases the contact lever portion 71. The second lever biasing member 75 is an example of a biasing part, and is composed of, for example, a torsion coil spring, which causes the second lever 73 to rotate around the second shaft portion 73a as a pivot point, biasing the second lever 73 downward so that the first lever 72 moves away from the lower stem 62 of the trigger valve.

[0053] The main body 10 is equipped with a restricting part 15 on the handle portion 11 that restricts the position of the contact lever portion 71 relative to the trigger lever 70. When the trigger lever 70 rotates toward the handle portion 11 with the shaft portion 70a as the pivot point, the trajectory of the restricted portion 73b of the second lever 73 changes depending on whether the second lever 73 rotates with the second shaft portion 73a as the pivot point, and the angle of rotation. The restricting part 15 is integrally formed on the handle portion 11 so that when the trajectory of the restricted portion 73b passes through the part where the restricting part 15 is provided, and the trigger lever 70 rotates toward the handle portion 11 with the shaft portion 70a as the pivot point, the restricted portion 73b can make contact with the restricting part 15.

[0054] The restricting section 15 includes a first restricting surface 15a. The first restricting surface 15a is a surface that can come into contact with the front surface of the restricted section 73b when the trigger lever 70 rotates with the shaft portion 70a as a pivot point in the direction approaching the handle portion 11, while the trajectory of the restricted section 73b is passing through the area where the restricting section 15 is provided. When the front surface of the restricted section 73b comes into contact with the first restricting surface 15a of the restricting section 15, the rotation of the second lever 73 forward with the second shaft portion 73a as a pivot point is restricted. As a result, the movement of the first lever 72 in the direction that increases the distance between the contact arm contact portion 72d and the second shaft portion 73a is restricted.

[0055] The restricting portion 15 may be configured as a recess and include a second restricting surface 15b positioned opposite the first restricting surface 15a. The second restricting surface 15b is configured such that when the trajectory of the restricted portion 73b moves through the area where the restricting portion 15 is provided, the rear surface of the restricted portion 73b can come into contact with the second restricting surface 15b when the trigger lever 70 rotates with the shaft portion 70a as a pivot point in the direction approaching the handle portion 11. When the rear surface of the restricted portion 73b comes into contact with the second restricting surface 15b of the restricting portion 15, the force acting on the first lever 72 from the trigger valve lower stem 62 as the trigger valve lower stem 62 moves downward restricts the second lever 73 from unnecessarily rotating backward.

[0056] The contact portion 8 is biased downward by the biasing member 82, and the standby position is when predetermined parts such as the first contact arm 81a and the second contact arm 81b are in contact with a stopper (not shown) provided on the body portion 10a or the nose portion 12, and it cannot move any further downward. Similarly, the trigger portion 7 is biased by the trigger biasing member 70b in a direction away from the handle portion 11, so that the part of the trigger lever 70 opposite to the shaft portion 70a is in contact with a stopper (not shown) provided on the body portion 10a or the handle portion 11, and it cannot rotate any further.

[0057] When the trigger lever 70 and contact section 8 are in this standby position, the contact lever section 71 is in a state where it can move to a position where the first lever 72 engages with the second contact arm 81b when the trigger lever 70 is pulled.

[0058] When the trigger lever 70 is pulled from its standby position, and the restricted portion 73b of the contact lever portion 71 is not engaged with the restricting portion 15, the first lever 72 and the second lever 73 become rotatable relative to the trigger lever 70, with the second shaft portion 73a acting as a pivot. In other words, the contact portion 72e of the first lever 72 and the contacted portion 73c of the second lever 73 are in contact due to the biasing of the first lever biasing member 74, and the first lever 72 and the second lever 73 become rotatable relative to the second shaft portion 73a when they are fully open.

[0059] In contrast, when the trigger lever 70 is pulled from its standby position, and the restricted portion 73b of the contact lever portion 71 is engaged with the restricting portion 15, the first lever 72 can rotate relative to the trigger lever 70 with the first shaft portion 72a as the pivot point. The second lever 73 cannot rotate relative to the second shaft portion 73a because the restricted portion 73b is engaged with the restricting portion 15.

[0060] Furthermore, when the trigger lever 70 is pulled from the standby position and the restricted portion 73b is engaged with the restricting portion 15, the first shaft portion 72a of the contact lever portion 71 is at a greater distance from the shaft portion 70a than the first shaft portion 72a when the restricted portion 73b is not engaged with the restricting portion 15.

[0061] In other words, when the trigger lever 70 is pulled from the standby position and the restricted portion 73b is engaged with the restricting portion 15, the horizontal distance from the first shaft portion 72a to the trajectory of the arm tip portion 81c of the second contact arm 81b, which moves in the vertical direction, is longer than the horizontal distance from the first shaft portion 72a to the trajectory of the arm tip portion 81c when the restricted portion 73b is not engaged with the restricting portion 15.

[0062] Furthermore, the distance from the tip 72g of the first lever 72 to the first shaft portion 72a is shorter than the distance from the tip 72g of the first lever 72 to the second shaft portion 73a when the first lever 72 and the second lever 73 are fully open.

[0063] When the trigger lever 70 is pulled, and the restricted portion 73b is not engaged with the restricting portion 15, the contact lever portion 71 rotates integrally around the second shaft portion 73a as a pivot point with the first lever 72 and the second lever 73 fully open, causing the movement trajectory of the lever tip portion 72g to trace a circle centered on the second shaft portion 73a. The movement trajectory L of the arm tip portion 81c passes through this movement trajectory of the lever tip portion 72g. Therefore, the first lever 72 of the contact lever portion 71 is in a state where it can move to a position where it engages with the arm tip portion 81c of the second contact arm 81b.

[0064] In contrast, when the trigger lever 70 is pulled, the contact lever portion 71 rotates with the second lever 73 pivoting on the second shaft portion 73a, and the restricted portion 73b engages with the restricting portion 15. As a result, the first lever 72 rotates with the first shaft portion 72a pivoting on it, causing the movement trajectory of the lever tip portion 72g to trace a circle centered on the first shaft portion 72a. Within this movement trajectory of the lever tip portion 72g, there are areas through which the movement trajectory of the arm tip portion 81c passes and areas through which it does not, depending on the vertical position of the second contact arm 81b and the position of the lever tip portion 72g of the first lever 72 rotating with the first shaft portion 72a as a pivot. Therefore, the movement of the first lever 72 to the position where it engages with the arm tip portion 81c of the second contact arm 81b is restricted.

[0065] As a result, the restricting unit 15 restricts the movement of the contact lever unit 71 to the position where it engages with the contact arm 81.

[0066] The contact arm 81 includes a second restricting portion 81d. The second restricting portion 81d is located below the arm tip 81c, on the movement path of the lever tip 72g of the first lever 72, which is restricted by the restricting portion 15 to move to a position where it engages with the arm tip 81c of the second contact arm 81b. As a result, when the second contact arm 81b is in the top dead center position, the second restricting portion 81d restricts the lever tip 72g from moving further downward along the side surface of the second contact arm 81b when the first lever 72 of the contact lever portion 71 is pushed by the trigger valve lower stem 62. Furthermore, if the second restricting portion 81d is not provided, the lever tip 72g moves downward along the side surface of the second contact arm 81b, and when the angle between the side surface of the second contact arm 81b and the first lever 72 becomes a predetermined acute angle, the first lever 72 may not return to the movement path of the arm tip 81c.

[0067] <Example of operation of the nail gun according to this embodiment> Figures 6 to 8 are cross-sectional views of the main part of the trigger section, showing an example of the operation of the nail gun of this embodiment during continuous firing. Next, the operation of the nail gun 1 during continuous firing will be described.

[0068] When performing continuous nail driving, the operator first pulls the trigger lever 70 from the standby state shown in Figure 5. When performing continuous nail driving, the operator does not press the contact top 80 against the material to be driven before pulling the trigger lever 70.

[0069] When the trigger lever 70 is pulled, as shown in Figure 6, the trigger lever 70 rotates in the direction of arrow C1, compressing the trigger biasing member 70b with the shaft portion 70a as the pivot point. As the trigger lever 70 rotates with the shaft portion 70a as the pivot point, the end of the trigger lever 70 that extends from the shaft portion 70a along the handle portion 11 moves in a direction toward the handle portion 11.

[0070] Furthermore, when the trigger lever 70 rotates around the shaft portion 70a as a pivot point, the contact lever portion 71, which is supported by the trigger lever 70 via the second shaft portion 73a, also moves in synchronous motion. The contact lever portion 71 moves in synchronous motion with the trigger lever 70 when the contact portion 72e of the first lever 72 and the contacted portion 73c of the second lever 73 are in contact due to the biasing force of the first lever biasing member 74, and the first lever 72 and the second lever 73 are in their maximum open position. However, the first lever 72 and the second lever 73 do not necessarily have to be in their maximum open position, as long as the length from the lever tip portion 72g of the first lever 72 to the second shaft portion 73a is not shorter than the length from the movement trajectory of the arm tip portion 81c to the second shaft portion 73a.

[0071] However, even when the trigger lever 70 rotates on its pivot point 70a and moves to the completed pull position, approaching the handle 11 to a specified position, the first lever 72 does not move the trigger valve upper stem 61 upward via the trigger valve lower stem 62, nor does it move the trigger valve upper stem 61 to the operating position. Therefore, it does not move to the sign-on position where the trigger valve 6 becomes operable.

[0072] Furthermore, even when the trigger lever 70 is pulled to its completed position, the restricted portion 73b of the second lever 73 remains disengaged from the restricting portion 15. As a result, when the trigger lever 70 is pulled to its completed position, the first lever 72 moves to a position where it can engage with the contact arm 81.

[0073] The operator first pulls the trigger lever 70, presses the contact top 80 against the material to be nailed, and moves the nail gun 1 toward the material to be nailed. When the contact top 80 is pressed against the material to be nailed, as shown in Figure 7, the first contact arm 81a pushes up the second contact arm 81b, and the second contact arm 81b moves upward relative to the main body 10 in the direction indicated by arrow U1, while compressing the biasing member 82.

[0074] Furthermore, when the second contact arm 81b moves upward relative to the main body 10, the arm tip 81c comes into contact with the contact arm contact portion 72d, pushing the first lever 72 of the contact lever portion 71 upward towards the trigger valve lower stem 62. When the first lever 72 is pushed upward while the restricted portion 73b of the second lever 73 is not engaged with the restricting portion 15, the contact lever portion 71 rotates in the direction of arrow E1 with the second shaft portion 73a as the pivot point relative to the trigger lever 70, with the first lever 72 and the second lever 73 fully open.

[0075] As a result, the first lever 72 of the contact lever section 71 moves in a direction that pushes the trigger valve lower stem 62, causing the trigger valve stem contact portion 72c to contact the trigger valve lower stem 62 during rapid pressing, and moving the trigger valve lower stem 62 upward relative to the main body section 10 as indicated by arrow U1. The contact lever section 71 has a first lever 72 and a second lever 73 that are rotatable around the first shaft portion 72a and the second shaft portion 73a as pivot points. However, when the trigger valve stem contact portion 72c is in contact with the trigger valve lower stem 62 during rapid pressing, if the first lever 72 moves backward and the lever restricting portion 72f contacts the trigger valve lower stem 62, the backward movement of the first lever 72 is restricted. As a result, the first lever 72 maintains the state in which the trigger valve stem contact portion 72c is in contact with the trigger valve lower stem 62 during rapid pressing. Furthermore, the contact portion 72e of the first lever 72 and the contacted portion 73c of the second lever 73 are maintained in contact by the biasing force of the first lever biasing member 74. Thus, the first lever 72 and the second lever 73 rotate around the second shaft portion 73a as a pivot point when fully open.

[0076] When the trigger valve lower stem 62 moves upward relative to the main body 10, the trigger valve upper stem 61, shown in Figures 1 and 3, is pushed by the trigger valve lower stem 62 and moves upward relative to the main body 10.

[0077] Figure 9 is a cross-sectional view of the main part showing an example of the operation of the trigger valve section 6. When the second contact arm 81b moves upward relative to the main body 10, the trigger valve lower stem 62 and the trigger valve upper stem 61 move upward relative to the main body 10. When the trigger valve lower stem 62 and the trigger valve upper stem 61 move to the operating position, the trigger valve section 6 enters an ON state, indicating that it is operational. When the trigger valve upper stem 61 moves to the operating position and the trigger valve section 6 enters an ON state, compressed air is exhausted from the trigger valve lower chamber formed below the pilot valve 60 into the exhaust chamber 14, and the pilot valve 60 moves downward. When the pilot valve 60 moves downward, the exhaust section 63a opens. As a result, compressed air is exhausted from the control chamber 51 through the connecting passage 67 to the exhaust chamber 14 from the exhaust section 63a.

[0078] When compressed air is exhausted from the control chamber 51, the air pressure from the compressed air supplied from the main chamber 13 moves the head valve 50 upward, and compressed air is supplied from the main chamber 13 to the striking cylinder 30, causing the striking piston 30a to move downward.

[0079] As a result, with the trigger lever 70 pulled first, the contact part 8 moves to the fully pressed position, and the trigger valve lower stem 62 moves relatively upward relative to the main body 10 to the operating position, the main valve part 5 operates, and a nail (not shown) is fired.

[0080] When nailing repeatedly, once a nail is driven out, the operator pulls the trigger lever 70 to the completion position and moves the nail gun 1 away from the material being driven. As the nail gun 1 moves away from the material being driven, the second contact arm 81b moves downward relative to the main body 10, as indicated by arrow D1, from the completed pressing position, due to the extension of the biasing member 82, as shown in Figure 8.

[0081] Furthermore, when the second contact arm 81b moves downward relative to the main body 10 from the pressed-down position, the force supporting the first lever 72 of the contact lever portion 71 by the second contact arm 81b is released. In addition, the trigger valve biasing member 64 shown in Figure 1 extends, and the trigger valve lower stem 62 moves downward relative to the main body 10 as indicated by arrow D1. This results in the sign being in the OFF state. Also, the contact lever portion 71 is biased by the second lever biasing member 75, causing the first lever 72 and the second lever 73 to rotate in the direction of arrow E2 with respect to the trigger lever 70, with the second shaft portion 73a as the pivot point.

[0082] The first lever 72 and the second lever 73 are biased by the second lever biasing member 75, and as they rotate in the direction of arrow E2 with the second shaft portion 73a as the pivot point, the lower stem 62 of the trigger valve is not prevented from moving downward relative to the main body portion 10 as indicated by arrow D1, and the sign is reliably turned OFF.

[0083] If the trigger lever 70 is held down after the sign is turned OFF, and the restricted portion 73b of the second lever 73 remains disengaged from the restricting portion 15, the contact lever portion 71 rotates in the direction of arrow E2 with the second shaft portion 73a as the pivot point relative to the trigger lever 70, with the first lever 72 and the second lever 73 in their fully open positions. This state is the same as in Figure 6, when the trigger lever 70 is pulled while the contact portion 8 is in the standby position. As a result, the first lever 72 of the contact lever portion 71 moves to a position where it can engage with the contact arm 81, which moves downward relative to the main body portion 10 and then upward again.

[0084] Therefore, when the operator pulls the trigger lever 70 and presses the contact top 80 against the material to be driven again, and moves the nail gun 1 toward the material to be driven, as shown in Figure 7, the contact lever section 71 rotates with the second shaft section 73a as a pivot point relative to the trigger lever 70, with the first lever 72 and the second lever 73 fully open. This causes the trigger valve stem contact section 72c of the first lever 72 to move toward the trigger valve lower stem 62. As a result, the trigger valve lower stem 62 moves upward relative to the main body section 10, the main valve section 5 is activated, and a nail (not shown) is driven out.

[0085] In this way, by maintaining the trigger lever 70 in the pulled position, pressing the contact top 80 against the material to be driven, and repeatedly moving the nail gun 1 toward and toward the material to be driven, the nail-driving operation can be performed continuously.

[0086] Figures 10 to 16 are cross-sectional views of the main part of the trigger section, showing an example of the operation of the nail gun of this embodiment during single-shot operation. Next, the operation of the nail gun 1 during single-shot operation will be described.

[0087] When performing a single nail drive by pulling the trigger lever 70 one nail at a time, the operator, starting from the standby state shown in Figure 5, first presses the contact top 80 against the material to be driven and moves the nail gun 1 toward the material to be driven. When the contact top 80 is pressed against the material to be driven, as shown in Figure 10, the first contact arm 81a pushes up the second contact arm 81b, and the second contact arm 81b moves upward relative to the main body 10 in the direction indicated by arrow U1, while compressing the biasing member 82.

[0088] As the second contact arm 81b moves upward relative to the main body 10, its tip 81c contacts the contact arm contact portion 72d of the first lever 72. When the second contact arm 81b moves to the fully pressed position, the contact lever portion 71 rotates in the direction of arrow E1 relative to the trigger lever 70, with the second shaft portion 73a as the pivot point, with the first lever 72 and the second lever 73 in their fully open positions.

[0089] The operator presses the contact top 80 against the material to be nailed, moves the nail gun 1 toward the material to be nailed, and pulls the trigger lever 70 when the second contact arm 81b has moved to the position where it is fully pressed.

[0090] When the trigger lever 70 is pulled, as shown in Figure 11, the trigger lever 70 rotates in the direction of arrow C1, compressing the trigger biasing member 70b with the shaft portion 70a as the pivot point. As the trigger lever 70 rotates with the shaft portion 70a as the pivot point, the end of the trigger lever 70 that extends from the shaft portion 70a along the handle portion 11 moves in a direction toward the handle portion 11.

[0091] When the trigger lever 70 rotates around the shaft portion 70a as a pivot point, the contact lever portion 71, which is supported by the trigger lever 70 via the second shaft portion 73a, also moves in synchronous motion. However, because the arm tip portion 81c of the second contact arm 81b is in contact with the contact arm contact portion 72d, the movement of the contact lever portion 71 is restricted by the arm tip portion 81c of the second contact arm 81b.

[0092] As a result, when the trigger lever 70 rotates around the shaft portion 70a as a pivot point, the contact lever portion 71 of the first lever 72 makes contact with the trigger valve stem contact portion 72b when the trigger valve is struck once. Furthermore, as the trigger lever 70 rotates around the shaft portion 70a as a pivot point while the trigger valve stem contact portion 72b is in contact with the trigger valve stem 62 when the trigger lever 70 rotates around the shaft portion 70a as a pivot point, the first lever 72 moves forward, and the lever restricting portion 72f makes contact with the trigger valve stem 62. When the lever restricting portion 72f makes contact with the trigger valve stem 62, the forward movement of the first lever 72 is restricted. As a result, the state in which the trigger valve stem contact portion 72b of the first lever 72 is in contact with the trigger valve stem 62 when the trigger valve is struck once is maintained. Furthermore, as the trigger lever 70 rotates further around its shaft 70a, the forward movement of the first lever 72 is restricted, causing the second lever 73 to rotate relative to the trigger lever 70 around its second shaft 73a in the direction of arrow E1. Additionally, with the forward movement of the first lever 72 restricted, as the second lever 73 rotates around its second shaft 73a in the direction of arrow E1, the first shaft 72a moves away from the shaft 70a. Also, as the contact portion 72e of the first lever 72 and the contacted portion 73c of the second lever 73 move away from each other, the first lever 72 rotates relative to the second lever 73 around its first shaft 72a in the direction of arrow F1.

[0093] Furthermore, when the first lever 72 is struck once, the trigger valve stem contact portion 72b moves upward to push the trigger valve lower stem 62, causing the trigger valve lower stem 62 to move upward relative to the main body 10 in the direction indicated by arrow U1.

[0094] When the operator further pulls the trigger lever 70, as shown in Figure 12, the trigger lever 70 rotates in the direction of arrow C1 with the shaft portion 70a as the pivot point and moves to the completed pull position. At this point, the lever restricting portion 72f comes into contact with the trigger valve lower stem 62, restricting the forward movement of the first lever 72. Thus, the first lever 72 maintains the state in which the trigger valve stem contact portion 72b is in contact with the trigger valve lower stem 62 during a single strike. Furthermore, because the forward movement of the first lever 72 is restricted, the contact lever portion 71 rotates further in the direction of arrow E1 with respect to the trigger lever 70, with the second lever 73 rotating in the direction of arrow E1 with respect to the second shaft portion 73a as the pivot point. Furthermore, as the contact portion 72e of the first lever 72 and the contacted portion 73c of the second lever 73 move away from each other, the first lever 72 rotates further in the direction of arrow F1 with respect to the second lever 73, with the first shaft portion 72a as the pivot point, and the first shaft portion 72a moves away from the shaft portion 70a.

[0095] Therefore, the first lever 72 of the contact lever portion 71 moves further in the direction of pushing the trigger valve lower stem 62, and the trigger valve lower stem 62 moves upward relative to the main body portion 10 to the operating position indicated by arrow U1, thereby turning on the ON sign of the trigger valve portion 6, which is ready to operate, and the main valve portion 5 is activated, causing a nail (not shown) to be driven out.

[0096] Furthermore, when the trigger lever 70 rotates on its pivot point 70a, restricting the forward movement of the first lever 72, the second lever 73 rotates on its pivot point 73a in the direction of arrow E1, and the first lever 72 rotates on its pivot point 72a in the direction of arrow F1, causing the first shaft 72a to move above the second shaft 73a. The restricted portion 73b is provided at a position extending from the second shaft 73a toward the first shaft 72a. As a result, the trajectory of the restricted portion 73b passes through the area where the restricting portion 15 is provided, and when the trigger lever 70 moves to the fully pulled position, the contact lever portion 71 causes the restricted portion 73b to enter the restricting portion 15.

[0097] When a nail is driven in, the operator pulls the trigger lever 70 to the completion position and moves the nail gun 1 away from the material to be driven. As the nail gun 1 moves away from the material to be driven, the contact arm 81 moves downward relative to the main body 10, as indicated by arrow D1, from the completed pressing position, due to the extension of the biasing member 82, as shown in Figure 13.

[0098] Furthermore, when the second contact arm 81b moves downward relative to the main body 10 from the pressed-down position, the support of the contact lever portion 71 on the first lever 72 by the second contact arm 81b is released, the trigger valve biasing member 64 shown in Figure 1 extends, and the trigger valve lower stem 62 moves downward relative to the main body 10 as indicated by arrow D1. This results in the sign being in the OFF state.

[0099] Furthermore, when the second contact arm 81b moves downward relative to the main body 10 from the pressed-down position, and the trigger valve lower stem 62 moves downward relative to the main body 10, the contact lever portion 71 is pushed downward by the trigger valve lower stem 62.

[0100] The contact lever portion 71 is in a state where the restricted portion 73b of the second lever 73 enters the restricting portion 15, and the front surface of the restricted portion 73b is in contact with the first restricting surface 15a. As a result, the rotation of the second lever 73 relative to the trigger lever 70 is restricted, and when the first lever 72 is pushed downward by the lower stem 62 of the trigger valve, only the first lever 72 becomes able to rotate in the direction of arrow F1 with the first shaft portion 72a as the pivot point.

[0101] When the second contact arm 81b moves downward relative to the main body 10, it is pushed downward by the trigger valve lower stem 62, causing only the first lever 72 to rotate in the direction of arrow F1 with the first shaft portion 72a as the pivot point. When the second contact arm 81b moves further downward relative to the main body 10 to a predetermined disengagement position between the pressed-down position and the bottom dead center position (standby position), the arm tip 81c of the second contact arm 81b separates from the lever tip 72g of the first lever 72, and only the first lever 72 rotates further in the direction of arrow F1 with the first shaft portion 72a as the pivot point. Also, the lever tip 72g of the first lever 72 moves to a position where it does not protrude into the movement path of the arm tip 81c of the second contact arm 81b, and the contact arm contact portion 72d is disengaged from the position where it can engage with the contact arm 81.

[0102] When the restricted portion 73b of the second lever 73 enters the restricting portion 15 and the front surface of the restricted portion 73b is in contact with the first restricting surface 15a, the contact lever portion 71 restricts the second lever 73 from rotating in the direction of arrow E2 with the second shaft portion 73a as the pivot point, and restricts the lever tip portion 72g of the first lever 72 from moving in a direction that approaches the movement path of the arm tip portion 81c of the second contact arm 81b. As a result, the lever tip portion 72g of the first lever 72 is restricted from moving to a position that protrudes into the movement path of the arm tip portion 81c of the second contact arm 81b, and is restricted from moving to a position where it can engage with the arm tip portion 81c of the contact arm 81. Furthermore, the first lever 72 is restricted from rotating in the direction opposite to the direction of arrow F1 by the trigger valve lower stem 62, which is biased downward by the trigger valve biasing member 64 via the trigger valve upper stem 61. As a result, the lever tip 72g of the first lever 72 is restricted from moving to a position where it protrudes into the movement path of the arm tip 81c of the second contact arm 81b, and is restricted from moving to a position where it can engage with the arm tip 81c of the contact arm 81.

[0103] Therefore, even if the operator pulls the trigger lever 70 while the second contact arm 81b is in a position between the bottom dead center and below a predetermined disengagement position, and moves the second contact arm 81b upward relative to the main body 10 as shown by arrow U1 in Figure 14, the lever tip 72g of the first lever 72 is restricted from moving to a position that protrudes into the movement path of the arm tip 81c of the second contact arm 81b, and the first lever 72 of the contact lever portion 71 does not engage with the arm tip 81c of the second contact arm 81b.

[0104] As a result, the first lever 72 of the contact lever portion 71 does not move in the direction of pushing the lower stem 62 of the trigger valve, and the lower stem 62 of the trigger valve does not move upward relative to the main body portion 10. Therefore, the sign OFF state is maintained.

[0105] Then, with the trigger lever 70 pulled, when the nail gun 1 is moved away from the material to be nailed again, the contact arm 81 moves downward relative to the main body 10, as shown in Figure 14, indicated by arrow D1.

[0106] Since the restricted portion 73b of the second lever 73 is engaged with the restricting portion 15, even when the contact arm 81 moves to the standby position, the first lever 72 of the contact lever portion 71 is restricted from moving to a position where it can engage with the contact arm 81.

[0107] Therefore, after first pressing the contact top 80 against the material to be driven, moving the nail gun 1 toward the material to be driven, and then pulling the trigger lever 70 to drive a nail, even if the trigger lever 70 is kept pulled and the contact top 80 is pressed against the material to be driven, and the nail gun 1 is moved toward and away from the material to be driven, the sign remains OFF and continuous nail driving does not occur.

[0108] In response, the operator releases the force pulling the trigger lever 70, or releases the trigger lever 70, from the state shown in Figure 13, for example. As a result, as shown in Figure 15, the trigger biasing member 70b extends, causing the trigger lever 70 to rotate in the direction of arrow C2 with the shaft portion 70a as the pivot point, and move away from the handle portion 11. When the trigger lever 70 moves away from the handle portion 11, the engagement between the restricted portion 73b of the second lever 73 and the restricting portion 15 is released, and the trigger lever 70 returns to the standby state shown in Figure 9, making it possible for the first lever 72 of the contact lever portion 71 to move to a position where it engages with the second contact arm 81b.

[0109] From this point forward, when driving nails in rapid succession, simply pull the trigger lever 70 first, then repeatedly move the nail gun 1 towards and away from the material to be nailed.

[0110] In contrast, if the contact top 80 is first pressed against the material to be driven, and the nail gun 1 is moved toward the material to be driven, and then the trigger lever 70 is pulled, after the nail is driven, the nail gun 1 may be lifted by the recoil, the contact part 8 will move relatively downward, and the arm tip 81c of the second contact arm 81b will separate from the lever tip 72g of the first lever 72, disengaging the engagement between the first lever 72 and the second contact arm 81b. In this case, by releasing the force pulling the trigger lever 70, or by releasing the trigger lever 70 and then pressing the contact part 8 against the material to be driven again, and then pulling the trigger lever 70, it becomes possible to drive nails. This makes it possible to drive a single nail.

[0111] Furthermore, by increasing the pressure the nail gun applies to the material to be driven, it is possible to suppress the recoil that causes the nail gun 1 to move away from the material when the nail is driven, and to prevent the second contact arm 81b from moving below a predetermined disengagement position to a position between the bottom dead center position and the material to be driven. In this state, the force pulling the trigger lever 70 is released, or the trigger lever 70 is released, and the nail gun 1 is moved laterally without moving the contact top 80 away from the material to be driven. At the next driving position, the nail gun 1 is moved closer to the material to be driven, and the trigger lever 70 is pulled, thereby driving the nail. This type of operation is also called slide driving.

[0112] When performing such an operation, as shown in Figure 14, with the second contact arm 81b positioned between the top dead center and the disengagement position, the movement of the first lever 72 along the second contact arm 81b is restricted by the second restricting part 81d, thereby preventing the first lever 72 from being pushed further downward by the trigger valve lower stem 62. As a result, when the force pulling the trigger lever 70 is released or the trigger lever 70 is released, the lever tip 72g of the first lever 72 does not get caught on the second contact arm 81b, nor does the lever tip 72g of the first lever 72 get stuck in the gap between the second contact arm 81b and the housing that constitutes the main body 10, and malfunctions are suppressed, allowing the contact lever part 71 to return to its initial position. Therefore, the above-mentioned sliding motion prevents the first lever 72 from being unable to return to its initial position, allowing the sliding motion to be performed stably.

[0113] The restricting portion 15 is provided in the handle portion 11, for example, as a roughly V-shaped groove. The restricting portion 15 is provided in the handle portion 11 which is integrated with the body portion 10a, that is, in the main body portion 10, thereby ensuring a contact area that can contact the restricted portion 73b. Furthermore, the restricted portion 73b can be made to protrude from the second shaft portion 73a toward the first shaft portion 72a to further increase the contact surface. In addition, the first restricting surface 15a of the restricting portion 15 can be made to protrude downward so that it contacts the portion of the second lever 73 below the restricted portion 73b, thereby further increasing the contact surface. As a result, the contact area is increased compared to when an engagement portion with the contact lever portion 71 is provided on the lower stem 62 of the trigger valve, so that the restriction of the contact lever portion 71 is stabilized. Therefore, high-precision machining is not required for the trigger valve lower stem 62 and the contact lever portion 71, and high precision in dimensional setting is not required for the regulating portion 15 and the regulated portion 73b of the second lever 73 to engage, nor is high machining precision required. In addition, since there is no need to form a stress concentration portion such as a groove in the trigger valve lower stem 62, strength can be ensured. Thus, the position of the contact lever portion 71 can be reliably regulated.

[0114] <Modified example of the nail gun of this embodiment> Figure 16 is a perspective view of the main part showing a modified example of the nail gun of this embodiment, and Figure 17 is a side cross-sectional view of the main part of the trigger section showing a modified example of the nail gun of this embodiment. The modified nail gun of this embodiment is equipped with a continuous striking restrictor 76 that restricts the movement of the contact lever section 71 at a position in which the restricted portion 73b of the second lever 73 can engage with the restrictor section 15. The continuous striking restrictor 76 is an example of a third restrictor and is provided on the movement path of the second lever 73 which rotates around the second shaft portion 73a as a pivot point in the contact lever section 71. The continuous striking restrictor 76 is constructed, for example, by inserting a cylindrical pin into a hole 76a made in the trigger lever 70, as shown in Figure 3. The continuous striking restrictor 76 restricts the rotation of the second lever 73 around the second shaft portion 73a as a pivot point. In other words, the rapid-fire restricting unit 76 restricts the movement of the lever tip 72g in a direction that approaches the movement path of the arm tip 81c of the second contact arm 81b. When the trigger lever 70 rotates with the shaft 70a as the pivot point, the rapid-fire restricting unit 76 restricts the rotation of the second lever 73 with the second shaft 73a as the pivot point at the position where the trigger valve stem contact portion 72b contacts the trigger valve lower stem 62 during a single-shot operation.

[0115] With the rotation of the second lever 73 restricted by the rapid-fire restricting unit 76, when the trigger lever 70 is pulled and rotates around the shaft portion 70a as a pivot point, the contact lever portion 71 of the first lever 72 causes the trigger valve stem contact portion 72b to contact the trigger valve lower stem 62 during a single-shot operation. Furthermore, with the trigger valve stem contact portion 72b in contact with the trigger valve lower stem 62 during a single-shot operation, the trigger lever 70 rotates around the shaft portion 70a as a pivot point, causing the first lever 72 to move forward, and the lever restricting portion 72f to contact the trigger valve lower stem 62. When the lever restricting portion 72f contacts the trigger valve lower stem 62, the forward movement of the first lever 72 is restricted. As a result, the state in which the trigger valve stem contact portion 72b of the first lever 72 is in contact with the trigger valve lower stem 62 during a single-shot operation is maintained. Furthermore, as the trigger lever 70 rotates further around its shaft 70a, the forward movement of the first lever 72 is restricted, causing the second lever 73 to rotate relative to the trigger lever 70 around its second shaft 73a in the direction of arrow E1. Additionally, with the forward movement of the first lever 72 restricted, as the second lever 73 rotates around its second shaft 73a in the direction of arrow E1, the first shaft 72a moves away from the shaft 70a. Also, as the contact portion 72e of the first lever 72 and the contacted portion 73c of the second lever 73 move away from each other, the first lever 72 rotates relative to the second lever 73 around its first shaft 72a in the direction of arrow F1. Furthermore, when the trigger lever 70 rotates around its shaft portion 70a as a pivot point, restricting the forward movement of the first lever 72, and the second lever 73 rotates around its second shaft portion 73a as a pivot point in the direction of arrow E1, and the first lever 72 rotates around its first shaft portion 72a as a pivot point in the direction of arrow F1, the first shaft portion 72a moves above the second shaft portion 73a. The restricted portion 73b is provided at a position extending from the second shaft portion 73a toward the first shaft portion 72a. As a result, the trajectory of the restricted portion 73b passes through the area where the restricting portion 15 is provided. Therefore, when the trigger lever 70 is pulled to the fully engaged position while the rotation of the second lever 73 is restricted by the rapid-fire restricting portion 76, the restricted portion 73b of the second lever 73 enters the restricting portion 15, and the movement of the contact lever portion 71 is restricted.As a result, the continuous striking restrictor 76 restricts the first lever 72 of the contact lever unit 71 from moving to a position where it can engage with the contact arm 81, thereby enabling only single strikes. The other configurations are the same as those of the nail gun 1 described above.

[0116] Furthermore, by making the rapid-fire regulating unit 76 detachable from the trigger lever 70, it is possible to switch between a nail gun capable of both rapid-fire and single-shot firing and a nail gun that is only capable of single-shot firing.

[0117] <Example of operation of a modified nail gun> Figures 19 to 21 are cross-sectional side views of the main part of the trigger section, showing an example of operation in which the rapid-fire action of a modified nail gun is restricted.

[0118] Consider the case where the operator pulls the trigger lever 70 before pressing the contact top 80 against the material to be driven. In the standby state shown in Figure 18, the rapid-fire restricting unit 76 is in contact with the second lever 73, so the direction of the contact lever unit 71, which rotates with the second shaft unit 73a as a pivot point, is restricted to the same position as when the contact arm 81 moves upward relative to the main body unit 10 and pushes up the first lever 72. When the trigger lever 70 is pulled from this standby state shown in Figure 18, as shown in Figure 19, the trigger lever 70 rotates in the direction of arrow C1, compressing the trigger biasing member 70b with the shaft unit 70a as a pivot point. When the trigger lever 70 rotates with the shaft unit 70a as a pivot point, the end of the trigger lever 70 that extends from the body unit 10a along the handle unit 11 moves in a direction toward the handle unit 11.

[0119] When the trigger lever 70 rotates around the shaft portion 70a as a pivot point, the contact lever portion 71, which is supported by the trigger lever 70 via the second shaft portion 73a, also moves in sync.

[0120] As described above, when the rotation of the second lever 73 is restricted by the rapid-fire restricting part 76, and the trigger lever 70 is pulled and rotates around the shaft portion 70a as a pivot point, the contact lever portion 71 of the first lever 72 causes the trigger valve stem contact portion 72b to contact the trigger valve lower stem 62 during a single-shot operation. Furthermore, when the trigger lever 70 rotates around the shaft portion 70a as a pivot point while the trigger valve stem contact portion 72b is in contact with the trigger valve lower stem 62 during a single-shot operation, the first lever 72 moves forward, and the lever restricting portion 72f comes into contact with the trigger valve lower stem 62. When the lever restricting portion 72f comes into contact with the trigger valve lower stem 62, the forward movement of the first lever 72 is restricted. As a result, the state in which the trigger valve stem contact portion 72b of the first lever 72 is in contact with the trigger valve lower stem 62 during a single-shot operation is maintained. Furthermore, the first lever 72 is restricted from rotating in the direction that pushes the trigger valve lower stem 62 upward, by the trigger valve lower stem 62 which is biased downward by the trigger valve biasing member 64 via the trigger valve upper stem 61. As a result, when the trigger lever 70 rotates further around the shaft portion 70a as a pivot point, the forward movement of the first lever 72 is restricted, causing the second lever 73 to rotate in the direction of arrow E1 around the second shaft portion 73a relative to the trigger lever 70. Moreover, with the forward movement of the first lever 72 restricted, when the second lever 73 rotates in the direction of arrow E1 around the second shaft portion 73a as a pivot point, the first shaft portion 72a moves away from the shaft portion 70a. Furthermore, as the contact portion 72e of the first lever 72 and the contacted portion 73c of the second lever 73 move away from each other, the first lever 72 rotates relative to the second lever 73 with the first shaft portion 72a as the pivot point in the direction of arrow F1. Also, with the trigger lever 70 rotating with the shaft portion 70a as the pivot point, restricting the forward movement of the first lever 72, when the second lever 73 rotates with the second shaft portion 73a as the pivot point in the direction of arrow E1, and the first lever 72 rotates with the first shaft portion 72a as the pivot point in the direction of arrow F1, the first shaft portion 72a moves above the second shaft portion 73a. The restricted portion 73b is provided at a position extending from the second shaft portion 73a toward the first shaft portion 72a. As a result, the trajectory of the restricted portion 73b passes through the area where the restricting portion 15 is provided.

[0121] When the operator pulls the trigger lever 70 further, as shown in Figure 20, the trigger lever 70 rotates in the direction of arrow C1 with the shaft portion 70a as the pivot point and moves to the completed position, the contact lever portion 71 rotates further in the direction of arrow E1 with respect to the trigger lever 70, with the second lever 73 rotating in the direction of arrow E1 with respect to the second shaft portion 73a as the pivot point. Also, the first lever 72 rotates further in the direction of arrow F1 with respect to the second lever 73, with respect to the first shaft portion 72a as the pivot point, so that the contact portion 72e of the first lever 72 and the contacted portion 73c of the second lever 73 move away from each other.

[0122] Therefore, the first lever 72 of the contact lever portion 71 does not move in the direction of pushing the trigger valve lower stem 62, and the trigger valve lower stem 62 does not move upward relative to the main body portion 10. Therefore, the main valve portion 5 does not operate, and the nail-driving operation (not shown) does not occur.

[0123] Furthermore, when the trigger lever 70 moves to the fully pulled position, the contact lever portion 71 enters a state where the restricted portion 73b engages with the restricting portion 15. When the trigger lever 70 moves to the fully pulled position and the restricted portion 73b engages with the restricting portion 15, the lever tip 72g of the first lever 72 is restricted from moving in a direction that approaches the movement path of the arm tip 81c of the second contact arm 81b. As a result, the lever tip 72g of the first lever 72 moves to a position where it protrudes into the movement path of the arm tip 81c of the second contact arm 81b, and is restricted from moving to a position where it can engage with the arm tip 81c of the contact arm 81. Therefore, the contact arm contact portion 72d of the first lever 72 is disengaged from the position where it can engage with the contact arm 81.

[0124] As a result, even when the operator pulls the trigger lever 70 and presses the contact top 80 against the material to be driven, and the contact arm 81 moves upward relative to the main body 10 as indicated by arrow U1, as shown in Figure 21, the first lever 72 of the contact lever portion 71 does not engage with the contact arm 81.

[0125] Therefore, the first lever 72 of the contact lever section 71 does not move in the direction of pushing the trigger valve lower stem 62, and the trigger valve lower stem 62 does not move upward relative to the main body section 10. Because the trigger valve lower stem 62 does not move upward relative to the main body section 10, the main valve section 5 does not operate, and the nail-driving operation (not shown) does not occur. As a result, rapid nailing, which is performed by first pulling the trigger lever 70 and then repeatedly moving the nail gun towards and away from the material to be nailed, is restricted.

[0126] In contrast, even with a configuration in which the trigger lever 70 is equipped with a rapid-fire restricting section 76, the contact arm contact section 72d protrudes into the movement path of the second contact arm 81b during standby, allowing engagement. Similar to the operation shown in Figures 10 to 16 above, the contact top 80 is first pressed against the material to be driven, the nail gun 1 is moved towards the material to be driven, and then the trigger lever 70 is pulled to drive out the nail. After the nail is driven out, the force pulling the trigger lever 70 is released, or the trigger lever 70 is released and then pulled again to make it possible to drive out nails again. This ensures that only single nail drives are effective. [Explanation of Symbols]

[0127] 1... Nail gun, 10... Main body, 10a... Body, 11... Handle, 12... Nose, 12a... Ejection passage, 12b... Ejection port, 13... Main chamber, 14... Exhaust chamber, 15... Regulator, 2... Driver, 3... Driving section, 30... Striking cylinder, 30a... Striking piston, 30e... Bumper, 33... Blowback chamber, 5... Main valve section, 50... Head valve, 51... Control chamber, 6... Trigger valve section, 60... Pilot valve, 61... Trigger valve upper stem, 62... Trigger valve lower stem, 63... Trigger valve housing, 64... Trigger valve biasing section, 7... Trigger section, 70... Trigger lever, 70a... • Shaft section, 70b...Trigger biasing member, 71...Contact lever section, 72...First lever, 72a...First shaft section, 72b...Trigger valve stem contact section during single press, 72c...Trigger valve stem contact section during rapid press, 72d...Contact arm contact section, 72e...Contact section, 72f...Lever regulating section, 73...Second lever, 73a...Second shaft Section, 73b...Restricted section, 73c...Contacted section, 74...First lever biasing member (biasing section), 75...Second lever biasing member (biasing section), 76...Continuous striking restricting section (third restricting section), 8...Contact section, 80...Contact top, 81...Contact arm, 81a...Second restricting section, 82...Biasing member, 9...Feeding section, 90...Magazine

Claims

1. The main body and A main chamber for storing compressed air, A striking cylinder is provided, which moves the striking piston in the axial direction by being supplied with compressed air stored in the main chamber, A main valve section that opens and closes the communication between the striking cylinder and the main chamber, A trigger valve unit that operates the main valve unit, A trigger unit that operates the trigger valve unit, It comprises a contact portion that is supported to be movable in the direction of impact by the impact piston and that can operate the trigger valve portion in cooperation with the operation of the trigger portion, The main body is, A torso that extends vertically, It comprises a handle portion extending from the body portion in a direction intersecting the body portion, The aforementioned contact portion is The contact top is pressed against the material to be driven, The system comprises a contact arm connected to the contact top and having an arm tip that can engage with the trigger portion, The trigger valve section is The system includes a pilot valve that operates the main valve section, and a trigger valve stem that controls the intake and exhaust of compressed air to switch whether or not the pilot valve is operated. The trigger unit is A trigger lever is supported so as to be movable relative to the main body, A contact lever portion is movably supported on the trigger lever and configured to engage with the contact arm and the trigger valve stem of the trigger valve, The contact lever portion is provided with a lever biasing portion that protrudes into the movement path of the tip of the contact arm and biases it to a position where it engages with the contact arm, The main body is equipped with a restricting portion that restricts the movement of the contact lever portion to a position in which it engages with the contact arm. Driving tool.

2. The restricting portion, when the contact lever portion makes contact, restricts the contact lever portion from protruding into the movement path of the tip of the contact arm. The driving tool according to claim 1.

3. If the contact arm moves upward before the trigger lever moves, the contact arm engages with the contact lever portion. If the trigger lever moves after the contact arm has moved upward, the contact lever portion moves the trigger valve stem, the trigger valve portion operates, and the contact lever portion comes into contact with the regulating portion. The driving tool according to claim 2.

4. The aforementioned contact lever portion, when in contact with the restricting portion, is provided with a restricted portion that restricts the contact arm from protruding into the movement path of the arm tip. The driving tool according to claim 1.

5. The aforementioned contact lever portion is A first lever that can engage with the tip of the contact arm, The system comprises a second lever movably supported by the trigger lever, The first lever is supported so as to be movable relative to the second lever. The driving tool according to claim 1.

6. The second lever is provided with a restricted portion that contacts the restricting portion when the trigger lever moves. The driving tool according to claim 5.

7. The second lever is, A first shaft portion that rotatably supports the first lever, The system includes a restricted portion that contacts the restricting portion when the trigger lever is moved, The trigger lever is rotatably supported on a second shaft as a pivot point, and when the restricted part comes into contact with the restricting part, the rotation of the second lever is restricted. The driving tool according to claim 5.

8. The first lever is provided with a contact portion that contacts the second lever, The second lever comprises a contacted portion that contacts the contacting portion, The lever biasing unit biases the first lever and the second lever in the direction in which the contacting portion and the contacted portion come into contact. The driving tool according to claim 7.

9. In the contact lever portion, with the contact portion and the contacted portion in contact, the first lever and the second lever rotate relative to the trigger lever with the second shaft portion as the pivot point. The driving tool according to claim 8.

10. The first lever is equipped with a lever restricting portion that contacts the trigger valve stem, When the lever restricting portion of the contact lever portion comes into contact with the trigger valve stem, the movement of the first lever is restricted, and the movement of the trigger lever guides the restricted portion to the restricting portion. The driving tool according to claim 7.

11. The contact lever portion is such that the restricted portion abuts against the restricting portion, and the rotation of the second lever is restricted, while the first lever rotates relative to the second lever with the first shaft portion as the pivot point. The driving tool according to claim 7.

12. The device includes a second restricting portion that restricts the downward movement of the first lever along the contact arm, which is restricted from moving to a position where it engages with the contact arm. The driving tool according to claim 5.

13. The second restricting portion is provided on the contact arm. The driving tool according to claim 12.

14. The trigger unit includes a third restricting unit that restricts the movement of the contact lever unit in a position where the restricted unit can engage with the restricting unit, and where the contact lever unit can engage with the contact arm. The driving tool according to claim 4.

15. The third restricting portion is detachably provided with respect to the trigger lever. The driving tool according to claim 14.

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