Driving tool

Abstract

The objective is to provide a drive tool that allows for a lower height of the main valve section. [Solution] The nail gun 1A includes a striking cylinder 30 that moves a striking piston 30a in an axial direction along the vertical direction when compressed air is supplied, a main chamber 13 that stores compressed air, a main valve section 5 having a head valve 50 that opens and closes the communication between the striking cylinder 30 and the main chamber 13, and a control chamber 51 that controls the opening and closing of the head valve 50 by the intake and exhaust of compressed air supplied from the main chamber 13, the control chamber 51 being provided on the outer circumference of the head valve 50.

Description

Technical Field

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

Background Art

[0002] An implanting tool that operates with the air pressure of compressed air includes a main valve having a head valve for switching the supply of compressed air to a striking cylinder. Conventionally, a configuration in which this head valve is provided above the striking cylinder has been proposed (see, for example, Patent Document 1). In addition, a configuration has been proposed in which the head valve is provided around the striking cylinder and a control chamber into which compressed air for operating the head valve enters is provided above the head valve (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration in which the head valve is provided above the striking cylinder, the height of the main valve along the vertical direction along the moving direction of the head valve increases. Also, in the configuration in which an air chamber into which compressed air for operating the head valve enters is provided above the head valve, the height of the main valve along the vertical direction also increases.

[0005] The present disclosure has been made to solve such problems, and an object thereof is to provide an implanting tool capable of reducing the height of the main valve.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, this disclosure provides a main chamber for storing compressed air, a striking cylinder that moves a striking piston axially along the vertical direction when compressed air is supplied from the main chamber, and a main valve section that switches whether or not compressed air is supplied to the striking cylinder. The main valve section includes a head valve that opens and closes the communication between the striking cylinder and the main chamber, and a control chamber that controls the opening and closing of the head valve by the intake and exhaust of compressed air supplied from the main chamber. The control chamber is a driving tool provided on the outer circumference of the head valve.

[0007] In this disclosure, the main valve has a control chamber formed on the outer circumference of the head valve, eliminating the need for space to provide a control chamber above the head valve. [Effects of the Invention]

[0008] In this disclosure, the main valve has a control chamber formed on the outer circumference of the head valve, which reduces the height of the main valve in the vertical direction. Therefore, the overall height of the driving tool can be reduced. [Brief explanation of the drawing]

[0009] [Figure 1] This is a side cross-sectional view showing an example of a nail gun according to this embodiment. [Figure 2] This is an external side view showing an example of a nail gun according to this embodiment. [Figure 3] This is a side cross-sectional view of a key part showing an example of a nail gun according to this embodiment. [Figure 4] This is a cross-sectional perspective view of the main valve section, showing an example of a nail gun according to this embodiment. [Figure 5] This is a side cross-sectional view of the main valve section, showing an example of a nail gun according to this embodiment. [Figure 6] This is a plan cross-sectional view of the main part of the trigger valve section, showing an example of a nail gun according to this embodiment. [Figure 7] This is a cross-sectional view of a key part showing an example of the operation of the nail gun of this embodiment. [Figure 8] This is a cross-sectional view of a key part showing an example of the operation of the nail gun of this embodiment. [Figure 9] This is a cross-sectional view of a key part showing an example of the operation of the nail gun of this embodiment. [Modes for carrying out the invention]

[0010] Hereinafter, with reference to the drawings, an embodiment of a nail gun, as an example of a nailing tool of the present invention, will be described.

[0011] <Example of the configuration of the nail gun according to this embodiment> Figure 1 is a side cross-sectional view showing an example of the nail gun according to this embodiment, Figure 2 is an external side view showing an example of the nail gun according to this embodiment, and Figure 3 is a side cross-sectional view of the main part showing an example of the nail gun according to this embodiment. Furthermore, Figure 4 is a perspective cross-sectional view of the main part of the main valve section showing an example of the nail gun according to this embodiment, and Figure 5 is a side cross-sectional view of the main part of the main valve section showing an example of the nail gun according to this embodiment. In addition, Figure 6 is a plan cross-sectional view of the main part of the trigger valve section showing an example of the nail gun according to this embodiment.

[0012] The nail gun 1 uses compressed air pressure to move the driver 2 axially. By moving the driver 2 axially, the nail gun 1 drives nails (not shown), which are consumables, into the material to be driven.

[0013] The nail gun 1 comprises a main body 10. The main body 10 extends vertically along the axial direction of the driver 2. The nail gun 1A is designed to be used by a person holding it by hand, and the main body 10 is equipped with a handle 11.

[0014] The nail gun 1 has a handle portion 11 located near the middle of the main body portion 10 along its extension direction. The handle portion 11 extends in a direction that intersects with the main body portion 10, which extends in the vertical direction. The main body portion 10 has an exterior made of resin, and the handle portion 11 is integrally formed with the main body portion 10. The nail gun 1 also has a nose portion 12. In the nail gun 1A, the nose portion 12 is attached to one side of the main body portion 10 along its extension direction.

[0015] As shown in FIG. 1 and the like, the nail driving machine 1 is illustrated in a form where the nose portion 12 faces downward. One side along the extending direction of the main body portion 10, which is the nail ejection direction not shown, is referred to as the lower side, and the other side along the extending direction of the main body portion 10 is referred to as the upper side. In the nail driving machine 1, the downward direction is indicated by arrow D. Also, in the nail driving machine 1, the upward direction opposite to the downward direction is indicated by arrow U. The driver 2 has an axial direction along the vertical direction and moves in the downward and upward directions.

[0016] The nose portion 12 includes an injection passage 12a through which nails are supplied and an ejection port 12b through which the nails supplied to the injection passage 12a are ejected.

[0017] The injection passage 12a extends along the vertical direction in which the driver 2 moves. The ejection port 12b is formed by providing an opening at the lower end along the extending direction of the injection passage 12a.

[0018] The nail driving machine 1 includes a main chamber 13 to which compressed air is supplied from an external air compressor not shown, a main chamber housing 13a that constitutes the main chamber 13, and an exhaust chamber 14 that constitutes a part of an exhaust path for exhausting compressed air to the outside of the nail driving machine 1. Also, the nail driving machine 1A includes a driving portion 3 for driving nails into a workpiece. The driving portion 3 includes a striking cylinder 30 to which compressed air is supplied from the main chamber 13 and that axially moves the driver 2, and a striking piston 30a that moves by the air pressure of the compressed air supplied to the striking cylinder 30.

[0019] The striking cylinder 30 extends in the vertical direction and is composed of a cylindrical member with openings at the upper and lower ends, and is attached inside the main body portion 10

[0020] 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. The striking cylinder 30 has an upper striking cylinder chamber 30b formed in the space above the striking piston 30a.

[0021] 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.

[0022] 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.

[0023] The striking cylinder 30 is equipped with a lower bumper 30e at its axial lower end. The lower bumper 30e is made of an annular elastic body and is exposed to the opening at the lower end of the striking cylinder 30, with a shape that allows the striking piston 30a to contact it. The striking piston 30a is movable downward to a position where it contacts the lower bumper 30e. The bottom dead center position of the striking piston 30a and the driver 2 is when the striking piston 30a contacts the lower bumper 30e. The lower bumper 30e is configured to be elastically deformable, and the bottom dead center position of the striking piston 30a and the driver 2 moves within the range in which the lower bumper 30e can be elastically deformed.

[0024] In the nail gun 1, a supply channel 13c is formed around the outer circumference near the upper end of the striking cylinder 30, between the opening at the upper end of the striking cylinder 30 and the main chamber 13, through which compressed air supplied from the main chamber 13 to the upper chamber 30b of the striking cylinder 30 passes. The striking cylinder 30 is provided with a supply channel sealing portion 30c on its outer circumference near the upper end. The supply channel sealing portion 30c is made of an elastic material, such as an O-ring, and is fitted into a groove provided on the outer circumference near the upper end of the striking cylinder 30, with a portion of it protruding from the outer surface of the striking cylinder 30.

[0025] The striking cylinder 30 is housed in the space inside the main body 10. The main body 10 has an opening at the top, and when the striking cylinder 30 is housed there, the upper part of the striking cylinder 30 is exposed upward through this opening at the top.

[0026] The nail gun 1A is equipped with a cylinder cap 32. The cylinder cap 32 is made of a separate part from the main body 10 and is attached to the top of the main body 10. The cylinder cap 32 is shaped to cover the opening at the top of the main body 10, and when attached to the top of the main body 10, it houses the upper part of the striking cylinder 30.

[0027] The cylinder cap 32 is equipped with an upper bumper 30f at the upper axial end of the striking cylinder 30. The upper bumper 30f is made of a circular elastic body and is shaped to allow contact with the striking piston 30a. The upper bumper 30f is attached to the inner surface of the upper part of the cylinder cap 32 and faces the opening at the upper axial end of the striking cylinder 30. The striking piston 30a is movable upward to a position where it contacts the upper bumper 30f. The top dead center position of the striking piston 30a and the driver 2 is when the striking piston 30a contacts the upper bumper 30f. The upper bumper 30f is configured to be elastically deformable, and the top dead center position of the striking piston 30a and the driver 2 moves within the range in which the upper bumper 30f can be elastically deformed.

[0028] The upper bumper 30f is provided with an exhaust passage sealing portion 30g on its outer circumference. The exhaust passage sealing portion 30g is integrally formed on the outer circumference of the upper bumper 30f, which is an elastic material.

[0029] The main chamber 13 is shaped such that the main chamber housing 13a covers the upper periphery of the striking cylinder 30, and is provided on the outer circumference of the striking cylinder 30 within the handle portion 11, the main body portion 10 connected to the handle portion 11, and the main chamber housing 13a. The main chamber housing 13a is mounted inside the cylinder cap 32 on the upper side of the main body portion 10. The main chamber housing 13a also has a diameter reduction portion 13b formed in which the inner and outer diameters of the upper portion are smaller than those of the lower portion. The exhaust chamber 14 is composed of a space that connects the inside of the side of the cylinder cap 32 to the inside of the upper portion, and is formed on the outer circumference of the main chamber housing 13a. The exhaust chamber 14 is a flow path connecting the opening at the upper end of the striking cylinder 30 and an exhaust hole (not shown) provided in the main body portion 10, and constitutes part of the exhaust path that exhausts the compressed air inside the striking cylinder 30 to the outside of the nail gun 1.

[0030] Furthermore, the nail gun 1A 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 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.

[0032] 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, a control chamber 51 that controls the opening and closing of the head valve 50 by exhausting compressed air, and a main valve biasing member 52 that biases the head valve 50. The main valve section 5 also includes a main valve housing 53 that supports the head valve 50 and the like.

[0033] The head valve 50 is provided around the vicinity of the upper end of the striking cylinder 30 and around the diameter reduction portion 13b of the main chamber housing 13a. The main valve housing 53 is shaped to cover the outer circumference of the head valve 50. The head valve 50 is mounted inside the main valve housing 53 and is supported so as to be movable vertically relative to the main valve housing 53. The main valve section 5 also has a control chamber 51 provided inside the main valve housing 53. When the head valve 50 is mounted inside the main valve housing 53, the control chamber 51 is formed between the inside of the main valve housing 53 and the periphery of the head valve 50.

[0034] The main valve section 5 includes a first main valve sealing section 54 that seals the communication between the main chamber 13 and the exhaust chamber 14. The first main valve sealing section 54 is made of, for example, an elastic O-ring and is fitted into a groove formed on the outer circumferential surface of the diameter reduction section 13b of the main chamber housing 13a.

[0035] Furthermore, the main valve section 5 includes a second main valve sealing section 55 that seals the communication between the upper chamber 30b of the striking cylinder and the main chamber 13. The second main valve sealing section 55 is made of, for example, an elastic O-ring and is fitted into a groove formed on the outer circumferential surface of the striking cylinder 30. Since the main chamber housing 13a is provided around the striking cylinder 30, the outer diameter of the striking cylinder 30 is smaller than the outer diameter of the diameter reduction section 13b of the main chamber housing 13a. As a result, the second main valve sealing section 55 is provided inside the first main valve sealing section 54. Also, the second main valve sealing section 55 is provided near the upper end of the striking cylinder 30 in order to seal the communication between the upper chamber 30b of the striking cylinder and the main chamber 13.

[0036] Furthermore, the main valve section 5 includes a third main valve sealing section 54b that seals the communication between the main chamber 13 and the exhaust chamber 14. The third main valve sealing section 54b is made of, for example, an elastic O-ring and is fitted into a groove formed on the upper end surface of the diameter reduction section 13b of the main chamber housing 13a. Alternatively, the first main valve sealing section 54, the second main valve sealing section 55, and the third main valve sealing section 54b may be made by fitting an O-ring or the like into a groove provided on the inner surface of the head valve 50, so that this O-ring is in contact with the striking cylinder 30 or the main chamber housing 13a.

[0037] The head valve 50 is formed such that the inner diameter of the lower part is matched to the outer diameter of the diameter reduction portion 13b of the main chamber housing 13a, so that the diameter reduction portion 13b of the main chamber housing 13a fits inside the lower part of the head valve 50. Similarly, the inner diameter of the upper part of the head valve 50 is matched to the outer diameter of the striking cylinder 30, so that the striking cylinder 30 fits inside the upper part of the head valve 50. The outer diameter of the diameter reduction portion 13b of the main chamber housing 13a is larger than the outer diameter of the striking cylinder 30. As a result, the head valve 50 is formed with smaller inner and outer diameters in the upper part than in the lower part, creating a valve diameter enlargement portion 50a in the lower part and a valve diameter reduction portion 50b in the upper part. In addition, the head valve 50 has a pressure receiving surface 50c that receives the air pressure of compressed air supplied from the main chamber 13 on a surface such as a slope connecting the valve diameter enlargement portion 50a and the valve diameter reduction portion 50b. Furthermore, the main valve section 5 has a control chamber 51 formed inside the main valve housing 53 around the valve diameter reduction section 50b of the head valve 50.

[0038] The first main valve sealing portion 54 seals the communication between the main chamber 13 and the exhaust chamber 14 by contacting the inner surface of the valve diameter enlargement portion 50a in the head valve 50. The second main valve sealing portion 55 seals the communication between the supply passage 13c and the upper chamber 30b of the striking cylinder and the main chamber 13 by contacting the inner surface of the valve diameter reduction portion 50b in the head valve 50. Furthermore, the third main valve sealing portion 54b seals the communication between the main chamber 13 and the exhaust chamber 14 by contacting a plane formed on a part of the pressure receiving surface 50c in the head valve 50.

[0039] The main valve biasing member 52 is an example of a main valve biasing part, and is composed of, for example, a coil spring. The main valve biasing member 52 is provided on the outside of the main valve housing 53, specifically, on the outside of the imaginary line 53L that connects the outer peripheral surface of the main valve housing 53 in the circumferential direction, as shown in Figure 6. That is, the main valve biasing member 52 is provided on the outer peripheral side of the control chamber 51 formed outside the valve diameter reduction section 50b. As a result, the main valve biasing member 52 is provided inside the exhaust chamber 14 formed outside the main valve housing 53. Furthermore, since the main valve biasing member 52 is provided on the outside of the main valve housing 53, it is provided on the outer circumference of the striking cylinder 30 and even on the outer circumference of the head valve 50.

[0040] The main valve biasing member 52 biases the head valve 50 in the closing direction to prevent it from stopping midway, as the force pushing the head valve 50 from above and the force pushing it from below are balanced by the air pressure balance of the compressed air during the operation of the head valve 50. Furthermore, by biasing the head valve 50 in the closing direction with the main valve biasing member 52, if the hose supplying compressed air (not shown) is disconnected from the nail gun 1 while the head valve 50 is open, the head valve 50 will close, thereby preventing malfunction.

[0041] The main valve section 5 includes a biasing member support section 53a that supports the main valve biasing member 52. The biasing member support section 53a protrudes outward from the outer circumference of the main valve housing 53 and supports the upper end, which is one end of the main valve biasing member 52, in the main valve housing 53.

[0042] Furthermore, the main valve section 5 includes a base section 56 that supports the main valve biasing member 52 on the head valve 50. The base section 56 is fitted into a groove formed on the outer circumference of the valve diameter enlargement section 50a, and the head valve 50 and the base section 56 are mounted so that they can rotate relative to each other in the circumferential direction. As a result, the head valve 50 to which the base section 56 is attached is supported so that it can rotate circumferentially with respect to the main valve housing 53.

[0043] The base portion 56 includes a biasing member engagement portion 56a into which the main valve biasing member 52 engages. The biasing member engagement portion 56a protrudes outward from the outer circumference of the main valve housing 53 and supports the lower end, which is the other end of the main valve biasing member 52, on the head valve 50.

[0044] The main valve section 5 includes a rotation restricting section 53b that restricts the rotation of the base section 56. The rotation restricting section 53b is composed of a groove that penetrates from the inner circumference to the outer circumference of the main valve housing 53 and extends from the lower end of the main valve housing 53 in a vertical direction along the direction of movement of the head valve 50. The rotation restricting section 53b has an inner width slightly wider than the outer width of the biasing member engaging section 56a into which the biasing member engaging section 56a fits, and into which the biasing member engaging section 56a can move vertically along the rotation restricting section 53b.

[0045] As a result, the head valve 50 is supported so that it can move vertically, with the biasing member engaging portion 56a being guided by the rotation restricting portion 53b, while the rotation of the base portion 56 relative to the main valve housing 53 is suppressed by the biasing member engaging portion 56a engaging with the rotation restricting portion 53b. Therefore, the biasing member engaging portion 56a of the base portion 56 is prevented from shifting circumferentially relative to the biasing member support portion 53a of the main valve housing 53, which would cause the main valve biasing member 52 to tilt or bend. Furthermore, since the head valve 50 is rotatable relative to the base portion 56, even if the rotation of the base portion 56 relative to the main valve housing 53 is restricted, the head valve 50 to which the base portion 56 is attached is supported so that it can rotate circumferentially relative to the main valve housing 53. As a result, even if the head valve 50 rotates circumferentially, the base portion 56 does not rotate, thus suppressing the load on the rotation restricting portion 53b caused by the rotation of the head valve 50. Therefore, the increase in sliding resistance when the head valve 50 moves up and down is suppressed. The rotation restricting portion may also be formed by providing, for example, a groove extending vertically in the inner wall of the cylinder cap 32, which constitutes the inner wall of the exhaust chamber 14 facing the biasing member engaging portion 56a of the base portion 56. Alternatively, the rotation restricting portion may be formed by both the rotation restricting portion 53b described above and the groove formed in the inner wall of the cylinder cap 32.

[0046] Furthermore, the main valve section 5 includes a disassembly restricting section 53c that restricts the disassembly of the base section 56 and the head valve 50 relative to the main valve housing 53. The disassembly restricting section 53c is configured with a groove 53d that penetrates from the inner circumference to the outer circumference of the main valve housing 53 and extends vertically in the direction of movement of the head valve 50 from the lower end of the main valve housing 53, and a stopper section 53e that protrudes from the lower end of the groove 53d along the circumferential direction of the main valve housing 53.

[0047] The base portion 56 includes a disassembly-restricted portion 56b that restricts the disassembly of the base portion 56 and the head valve 50 relative to the main valve housing 53. The disassembly-restricted portion 53c has an inner width slightly wider than the outer width of the disassembly-restricted portion 56b, allowing the disassembly-restricted portion 56b to move vertically along the groove 53d. In addition, the disassembly-restricted portion 53c has a protruding abutment portion 53e that intersects with the movement path of the disassembly-restricted portion 56b.

[0048] As a result, the head valve 50 is supported so that it can move vertically, with the base portion 56 being prevented from detaching from the main valve housing 53 by the disassembly-restricted portion 56b entering the disassembly-restricted portion 53c. Therefore, the disassembly of the base portion 56 and the head valve 50 relative to the main valve housing 53 is suppressed.

[0049] The main valve housing 53, to which the head valve 50 and the main valve biasing member 52 are assembled, is housed in the cylinder cap 32 and mounted on the upper part of the main body 10. As a result, the main valve section 5 has the head valve 50 located in the upper part of the main body 10. In addition, the control chamber 51 of the main valve section 5 is located in the upper part of the main body 10, around the head valve 50.

[0050] When the head valve 50 moves downward, the main valve section 5 closes the supply passage 13c by bringing the valve diameter reduction section 50b into contact with the second main valve sealing section 55, sealing the communication between the upper chamber 30b of the striking cylinder and the main chamber 13, thus disconnecting the striking cylinder 30 and the main chamber 13. Conversely, when the head valve 50 moves upward, the main valve section 5 opens the supply passage 13c by moving the valve diameter reduction section 50b away from the second main valve sealing section 55, connecting the upper chamber 30b of the striking cylinder and the main chamber 13, thus connecting the striking cylinder 30 and the main chamber 13.

[0051] Furthermore, when the head valve 50 moves downward, the main valve section 5 has a third main valve sealing portion 54b that contacts a plane formed on a part of the pressure-receiving surface 50c, sealing the communication between the main chamber 13 and the exhaust chamber 14. Also, when the head valve 50 moves upward, the main valve section 5 has a head valve 50 that contacts the exhaust flow path sealing portion 30g, sealing the space between the striking cylinder 30 and the exhaust chamber 14. Moreover, when the head valve 50 is moved downward and when it is moved upward, the valve diameter enlargement portion 50a of the main valve section 5 contacts the first main valve sealing portion 54, sealing the communication between the main chamber 13 and the exhaust chamber 14.

[0052] 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 1A 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.

[0053] The trigger valve section 6 consists of a pilot valve 60, an upper trigger valve stem 61, and a trigger valve biasing member 64, which are assembled to the trigger valve housing 63 and are located above the main body 10 relative to the handle section 11. The trigger valve section 6 also includes a lower trigger valve stem 62 located between the trigger section 7 and the upper trigger valve stem 61, between the main body 10 and the handle section 11. The pilot valve 60, the upper trigger valve stem 61, and the lower trigger valve stem 62 are each supported so as to be movable in the vertical direction. The trigger valve housing 63 includes an exhaust section 63a that is opened and closed by the vertical movement of the pilot valve 60.

[0054] The trigger valve section 6 includes a connecting passage 67 that connects the trigger valve housing 63 and the control chamber 51 in the main valve housing 53. The connecting passage 67 extends laterally from the upper end of the trigger valve housing 63 near the exhaust section 63a, connecting the upper end of the trigger valve housing 63 to the control chamber 51.

[0055] 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 main body section 10 in the vertical direction. 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 section 8 is pressed against the material to be driven, causing the first contact arm 81a to push up the second contact arm 81b, and the second contact arm 81b to move upward relative to the main body section 10. The first contact arm 81a and the second contact arm 81b may be formed as a single unit.

[0056] The trigger unit 7 includes a trigger lever 70. The trigger lever 70 extends from the main body 10 along the handle 11, and the end on the main body 10 side is rotatably supported relative to the main body 10 with a shaft 70a as the pivot point. The trigger unit 7 includes a biasing member 70b that biases the trigger lever 70. The 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 main body 10 along the handle 11 in a direction away from the handle 11.

[0057] The trigger unit 7 includes a contact lever unit 71. The contact lever unit 71 is supported by the trigger lever 70 so as to be rotatable with the shaft unit 73a as the pivot point. The tip of the contact lever unit 71 is positioned on the movement path of the second contact arm 81b, which moves upward relative to the main body unit 10. In addition, the portion of the contact lever unit 71 between the tip and the shaft unit 73a faces the lower stem 62 of the trigger valve. As a result, the contact lever unit 71 is configured to be able to engage with the second contact arm 81b and the lower stem 62 of the trigger valve unit 6.

[0058] <Example of operation of the nail gun according to this embodiment> Figures 7 to 9 are cross-sectional views of the main parts showing an example of the operation of the nail gun of this embodiment. Next, the operation of the nail gun 1A will be described.

[0059] In the standby state shown in Figure 7, compressed air is supplied from the main chamber 13 to the control chamber 51 via the trigger valve unit 6 shown in Figure 1, etc. As a result, the head valve 50 moves downward due to the air pressure of the compressed air and the biasing force of the main valve biasing member 52, closing the communication between the main chamber 13 and the striking cylinder 30.

[0060] When the head valve 50 of the main valve section 5 moves downward to a position where it closes the communication between the main chamber 13 and the striking cylinder 30, the head valve 50 comes into contact with the first main valve sealing section 54, thereby sealing the communication between the main chamber 13 and the exhaust chamber 14. In addition, when the head valve 50 of the main valve section 5 comes into contact with the second main valve sealing section 55, the communication between the upper chamber 30b of the striking cylinder and the main chamber 13 is sealed.

[0061] The operator pulls the trigger lever 70 shown in Figure 1, etc., from the standby state shown in Figure 7. While the operator is pulling the trigger lever 70, they press the contact top 80 against the material to be nailed and move the nail gun 1 toward the material to be nailed. When the contact top 80 is pressed against the material to be nailed, the contact arm 81 moves upward relative to the main body 10.

[0062] Furthermore, when the contact arm 81 moves upward relative to the main body 10, it comes into contact with the contact lever portion 71, pushing the contact lever portion 71 toward the trigger valve lower stem 62. As a result, the contact lever portion 71 moves the trigger valve lower stem 62 upward relative to the main body 10.

[0063] When the lower stem 62 of the trigger valve moves upward relative to the main body 10, the upper stem 61 of the trigger valve is pushed by the lower stem 62 and moves upward relative to the main body 10.

[0064] When the second contact arm 81b moves upward relative to the main body 10, and the trigger valve lower stem 62 and the trigger valve upper stem 61 move upward relative to the main body 10 to the operating position, the trigger valve unit 6 becomes activatable, and the sign is turned ON. When the trigger valve upper stem 61 moves to the operating position, 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 into the exhaust chamber 14.

[0065] When compressed air is exhausted from the control chamber 51, the air pressure of the compressed air in the main chamber 13 causes the head valve 50 to move upward, as shown in Figure 8. When the head valve 50 moves upward, the main valve section 5 causes the head valve 50 to separate from the second main valve sealing section 55, opening the supply passage 13c and connecting the upper chamber 30b of the striking cylinder with the main chamber 13, thus creating a connection between the striking cylinder 30 and the main chamber 13. Furthermore, when the head valve 50 moves upward, the head valve 50 comes into contact with the exhaust passage sealing section 30g, sealing the space between the striking cylinder 30 and the exhaust chamber 14. In addition, the valve diameter enlargement section 50a of the main valve section 5 is in contact with the first main valve sealing section 54, sealing the connection between the main chamber 13 and the exhaust chamber 14. As a result, compressed air is supplied from the main chamber 13 to the upper chamber 30b of the striking cylinder 30, causing the striking piston 30a to move downward. This results in the driving of a nail, which is not shown in the diagram.

[0066] In the return operation shown in Figure 9, compressed air is supplied from the main chamber 13 to the control chamber 51 via the trigger valve section 6 shown in Figure 1, etc. As a result, the head valve 50 moves downward due to the air pressure of the compressed air and the biasing force of the main valve biasing member 52, and the supply passage 13c closes as the head valve 50 comes into contact with the second main valve sealing section 55, sealing the communication between the upper chamber 30b of the striking cylinder and the main chamber 13. Furthermore, when the head valve 50 moves downward, the third main valve sealing section 54b comes into contact with a plane formed on a part of the pressure receiving surface 50c, sealing the communication between the main chamber 13 and the exhaust chamber 14.

[0067] Next, the operation and effects of the nail gun 1 will be explained. As described above, the head valve 50 is configured such that the diameter reduction portion 13b of the main chamber housing 13a fits inside the valve diameter expansion portion 50a, with the inner diameter of the valve diameter expansion portion 50a matching the outer diameter of the diameter reduction portion 13b of the main chamber housing 13a. Also, the head valve 50 is configured such that the impact cylinder 30 fits inside the valve diameter reduction portion 50b, with the inner diameter of the valve diameter reduction portion 50b matching the outer diameter of the impact cylinder 30. In this configuration, the main valve portion 5 is configured such that the head valve 50 is provided around the impact cylinder 30 and around the diameter reduction portion 13b of the main chamber housing 13a.

[0068] Since the outer diameter of the striking cylinder 30 is smaller than the outer diameter of the diameter reduction portion 13b of the main chamber housing 13a, the second main valve sealing portion 55 that contacts the valve diameter reduction portion 50b is provided inward from the first main valve sealing portion 54.

[0069] The main valve section 5 seals the communication between the upper chamber 30b of the striking cylinder and the main chamber 13 by the valve diameter reduction portion 50b of the head valve 50 coming into contact with the second main valve sealing portion 55. Furthermore, a control chamber 51 is formed inside the main valve housing 53 around the valve diameter reduction portion 50b of the head valve 50. This makes it possible to reduce the vertical height of the main valve section 5.

[0070] Furthermore, the second main valve sealing portion 55 is provided near the upper end of the striking cylinder 30 to seal the communication between the upper chamber 30b of the striking cylinder and the main chamber 13. When the head valve 50 moves away from the second main valve sealing portion 55, the upper end of the striking cylinder 30 opens. This shortens the flow path length from the main chamber 13 to the striking cylinder 30, improving the operating response of the striking piston 30a.

[0071] Furthermore, the main valve biasing member 52 is provided outside the control chamber 51, which is formed inside the main valve housing 53 and outside the valve diameter reduction section 50b. As a result, the main valve biasing member 52 is provided in the exhaust chamber 14 formed outside the main valve housing 53, and is not provided inside the control chamber 51. In a configuration where the main valve biasing member is provided in the control chamber, if the main valve biasing member is a coil spring, the inner diameter side of the coil spring and the space between the spring wires become wasted volume. In contrast, by not providing the main valve biasing member 52 inside the control chamber 51, the wasted volume of the control chamber 51 is reduced compared to the case where the main valve biasing member is provided in the control chamber, so the decompression time from compressed air pressure to atmospheric pressure is shortened, and the speed at which the head valve 50 opens is increased. As a result, the operating response of the striking piston 30a is faster. Therefore, the operating response of the striking operation after the sign-on is improved.

[0072] In the main valve section, the sealing portion, such as the sealing member for storing compressed air or the surface to which the sealing member makes contact, moves. Therefore, it is necessary to ensure that the main valve biasing member does not interfere with the sealing portion. However, in a configuration where the main valve biasing member is provided inside the main valve housing, the main valve biasing member is provided close to the sealing portion, which severely restricts the placement of the main valve biasing member. In contrast, by providing the main valve biasing member 52 on the outside of the main valve housing 53, the degree of freedom in the position of the main valve biasing member 52, the number of main valve biasing members 52, and the amount of operation of the main valve biasing member 52 is increased. Furthermore, even if the main valve biasing member 52 is damaged, the sealing portion, such as the head valve 50, is provided inside the main valve housing 53, thus suppressing damage to the sealing portion inside the main valve housing 53. Furthermore, the head valve 50 is configured to be circumferentially rotatable relative to the base portion 56. The base portion 56 is restricted from rotating by the biasing member engaging portion 56a being guided by the rotation restricting portion 53b of the main valve housing 53. In addition, the main valve biasing member 52 is housed in a recess provided in the inner wall of the main valve housing 53, thereby preventing the main valve biasing member 52 from tipping over even if the head valve 50 rotates. [Explanation of Symbols]

[0073] 1A... Nail gun, 10... Main body, 11... Handle, 12... Nose, 12a... Injection passage, 12b... Injection port, 13... Main chamber, 13a... Main chamber housing, 13b... Diameter reduction section, 14... Exhaust chamber, 15... Regulating section, 2... Driver, 3... Driving section, 30... Impact cylinder, 30a... Impact piston, 30b... Upper chamber of impact cylinder, 30e... Bumper, 33... Blowback chamber, 5... Main valve section, 50... Head valve, 50a... Valve diameter enlargement section, 50b... Valve diameter reduction section, 51... Control chamber, 52... Main valve biasing member (main valve biasing section), 53... Main valve housing 53a... Biasing member support section, 53b... Rotation restricting section, 53c... Disassembly restricting section, 54... First main valve sealing section, 55... Second main valve sealing section, 56... Base section, 56a... Biasing member engagement section, 56b... Disassembly restricted section, 6... Trigger valve section, 60... Pilot valve, 61... Trigger valve upper stem, 62... Trigger valve lower stem, 64... Trigger valve biasing member, 67... Connecting flow path, 7... Trigger section, 70... Trigger lever, 70a... Shaft section, 70b... Biasing member, 71... Contact lever section, 8... Contact section, 80... Contact top, 81... Contact arm, 82... Biasing member, 9... Feed section, 90... Magazine

Claims

1. A main chamber for storing compressed air, The striking cylinder, which is moved axially along the vertical direction by the supply of compressed air from the main chamber, The system includes a main valve section that switches whether or not compressed air is supplied to the striking cylinder, The main valve section is A head valve that opens and closes the communication between the striking cylinder and the main chamber, The system includes a control chamber that controls the opening and closing of the head valve by inhaling and exhausting compressed air supplied from the main chamber, The control chamber is provided on the outer circumference of the head valve. Driving tool.

2. A main body that extends in the vertical direction, A cylinder cap is attached to the main body and covers the upper part of the main body, A main chamber housing that covers the periphery of the striking cylinder and forms the main chamber, The cylinder cap is provided with an exhaust chamber which is formed on the outer circumference of the main chamber housing and forms part of the exhaust passage for exhausting compressed air to the outside, consisting of a space that connects from the inside of the side of the cylinder cap to the inside of the upper part, The head valve is provided on the outer circumference of the main chamber housing, The main valve section includes a first main valve sealing section that seals the communication between the main chamber and the exhaust chamber. The first main valve sealing portion is provided on the outer circumference of the main chamber housing. The driving tool according to claim 1.

3. The main chamber housing has a diameter reduction section formed by making the inner and outer diameters of the upper part smaller than those of the lower part. The first main valve sealing portion is provided on the outer circumference of the diameter reduction portion. The driving tool according to claim 2.

4. The striking cylinder has an open upper end, and an upper striking cylinder chamber is formed above the striking piston. The main valve section includes a second main valve sealing section that seals the communication between the upper chamber of the striking cylinder and the main chamber, and the second main valve sealing section is provided radially inward from the first main valve sealing section. The driving tool according to claim 2.

5. The second main valve sealing portion is provided on the outer circumference of the striking cylinder near the upper end of the striking cylinder. The driving tool according to claim 4.

6. The head valve has a valve diameter reduction section formed by making the inner and outer diameters of the upper part smaller than the lower part. The control chamber is provided on the outer circumference of the valve diameter reduction portion. The driving tool according to claim 1.

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