Driving tool and method for manufacturing driving tool

Abstract

To provide a driving tool capable of reducing air flow resistance. [Solution] A driving tool (10) has an upstream pressure accumulator (3a) to which compressed air is supplied. An operating valve (5) is arranged downstream of the upstream pressure accumulator (3a). A downstream pressure accumulator (1e) is arranged downstream of the operating valve (5). The downstream pressure accumulator (1e) is opened and closed relative to a cylinder (2) by a main valve (4). The main valve (4) opens when the air pressure in a variable pressure chamber (4a) changes. A piston (1c) in the cylinder (2) moves when the main valve (4) opens. The variable pressure chamber (4a) communicates with the operating valve (5) by a communicating member (6). The communicating member (6) is formed of a separate member from the member forming the upstream pressure accumulator (3a) and the member forming the downstream pressure accumulator (1e).

Description

[Technical Field]

[0001] The present disclosure relates to driving tools, such as compressed air powered nail guns. [Background technology]

[0002] The driving tool of Patent Document 1 has pressure accumulators in the tool body and the grip. The tool body is equipped with a cylinder, which is connected to the pressure accumulator by a body valve. Compressed air supplied to the cylinder moves the piston relative to the cylinder in the driving direction.

[0003] The main valve has a variable pressure chamber, and the pressure in the variable pressure chamber is changed by the operating valve. When the user operates the trigger, the operating valve opens and closes. When the operating valve is closed, the variable pressure chamber and the pressure accumulator chamber are connected, and the main valve is kept closed. When the trigger is operated, the operating valve opens, and the variable pressure chamber is released to the atmosphere. This opens the main valve.

[0004] The actuating valve is located at the connection point between the tool body and the grip. A support portion that supports the actuating valve is also located at the connection point. A communication portion that connects the body valve and the actuating valve is also located at the connection point. As a result, the variable pressure chamber is narrowed at the connection point between the tool body and the grip. Moreover, both the support portion and the communication portion are formed as a single member with the housing that constitutes the grip and the tool body. Therefore, both the support portion and the communication portion have a certain thickness from the perspective of ensuring strength for releasing the housing from the mold that forms it. As a result, a portion of the pressure accumulator chamber is narrowed at the connection point between the tool body and the grip. This creates flow resistance for the air flowing from the pressure accumulator chamber to the cylinder. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6938256 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, there has been a need for a driving tool that can reduce air flow resistance. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, a driving tool has an upstream pressure accumulator to which compressed air is supplied. An actuation valve is disposed downstream of the upstream pressure accumulator. A downstream pressure accumulator is disposed downstream of the actuation valve. The downstream pressure accumulator opens and closes relative to the cylinder via a main valve. The main valve opens when the air pressure in the variable pressure chamber changes. The piston in the cylinder moves when the main valve opens. The variable pressure chamber communicates with the actuation valve via a communicating member. The communicating member is formed of a separate member from the member forming the upstream pressure accumulator and the member forming the downstream pressure accumulator. Therefore, the communicating member is less affected by the configuration of the housing that forms the pressure accumulator. For example, the communicating member can be formed of a thin member without considering the demolding strength of the mold that forms the housing. This allows the air flow path around the actuation valve to be expanded. In other words, an air flow path with low flow resistance can be formed for the air flow between the upstream pressure accumulator and the downstream pressure accumulator. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a left side view of the driving tool with the left housing removed. [Figure 2] FIG. 4 is an enlarged cross-sectional view of the operating valve and the communicating member. [Figure 3] FIG. 3 is a cross-sectional view corresponding to FIG. 2, illustrating a state in which the trigger is pulled. [Figure 4] FIG. 10 is a top view of the driving tool with the top cap removed. [Figure 5] FIG. 2 is an exploded perspective view of the operating valve and the communication member. [Figure 6] FIG. 10 is a rear view of the driving tool with the air plug removed. DETAILED DESCRIPTION OF THE INVENTION

[0009] According to another aspect of the present disclosure, the tool body houses the cylinder and the downstream accumulator. The grip extends from the tool body in a direction intersecting the driving direction. The grip houses the upstream accumulator. An actuating valve is disposed at a connection point between the tool body and the grip. Thus, the grip can be used as the accumulator.

[0010] According to another aspect of the present disclosure, the communication member has a cylindrical body through which the operating valve is inserted. A connecting pipe extends from the cylindrical body to the variable pressure chamber. Thus, the cylindrical body is supported by the operating valve.

[0011] According to another aspect of the present disclosure, an annular flow passage is formed between an inner circumferential surface of the cylindrical body of the communication member and an outer circumferential surface of the actuation valve. A connecting pipe is connected to the annular flow passage. Therefore, the cylindrical body is used as a flow passage leading to the connecting pipe, and the cylindrical body is supported by the actuation valve.

[0012] According to another aspect of the present disclosure, the communication member has a restricting portion protruding from the cylindrical body. The restricting portion restricts rotation of the cylindrical body relative to the tool body. This makes it easy to fix the communication member in position relative to the tool body.

[0013] According to another aspect of the present disclosure, the restriction portion protrudes into the upstream pressure accumulator. Because the upstream pressure accumulator is located upstream of the actuation valve, it is less likely to affect the flow of air. Therefore, the restriction portion can be provided without considering the resistance to the flow of air.

[0014] According to another aspect of the present disclosure, a restriction portion protrudes into the upstream pressure accumulator. The restriction portion includes a through hole that allows air to flow from the upstream pressure accumulator to the downstream pressure accumulator. Because the downstream pressure accumulator is located downstream of the actuation valve, air flow resistance is likely to occur if the downstream pressure accumulator becomes narrow. However, the restriction portion includes a through hole. Therefore, even if the restriction portion is provided in the downstream pressure accumulator, air flow resistance from the upstream pressure accumulator to the downstream pressure accumulator is unlikely to occur.

[0015] According to another aspect of the present disclosure, the connecting pipe of the communicating member extends perpendicular to the tubular body. The variable pressure chamber is located in the extending direction of the connecting pipe. Therefore, the length of the connecting pipe to the variable pressure chamber is short. This allows the communicating member to be made more compact.

[0016] According to another aspect of the present disclosure, the actuating valve is elongated in the extension direction of the tool body. Furthermore, both ends of the actuating valve are supported at locations that extend beyond the cylindrical inner circumferential surface of the grip. Therefore, the support structure for the actuating valve is formed outside the cylindrical inner circumferential surface of the grip. Therefore, the actuating valve does not need to be supported by a support portion that protrudes from the grip. Therefore, by eliminating or reducing the portion that protrudes from the inner circumferential surface of the grip, it is possible to avoid narrowing the connection point between the upstream pressure accumulator chamber and the downstream pressure accumulator chamber. This reduces air flow resistance.

[0017] According to another aspect of the present disclosure, a method for manufacturing a driving tool includes inserting a communicating member from the distal end of a grip toward the proximal end. Then, an actuating valve is inserted into the tool body along the extension direction of the cylinder and inserted into the communicating member. Therefore, the shape of the communicating member is affected only by the inner circumferential wall of the grip. Meanwhile, the actuating valve is affected only by the inner circumferential wall of a hole extending in the extension direction of the cylinder. As a result, the shapes of the communicating member and the actuating valve are less likely to affect each other, and assembly is easy.

[0018] Next, one embodiment of the present disclosure will be described with reference to FIGS. 1 to 6. As shown in FIG. 1, the driving tool 10 is a nail gun that drives nails using, for example, compressed air as a drive source. In the following description, the driving direction of the driving tool is defined as a downward direction, and the opposite driving direction is defined as an upward direction. A user holds the driving tool 10 in his / her hand and is positioned on the right side in FIG. 1. The side in front of the user is defined as the rear direction (user side), and the far side is defined as the front direction. Left and right directions are defined based on the user.

[0019] As shown in FIG. 1, the driving tool 10 has a tool body 1. The tool body 1 has a generally cylindrical housing 1a that extends vertically. The housing 1a is made of a lightweight metal material such as magnesium or aluminum. The top of the housing 1a is airtightly sealed by a top cap 1b. A driving nose 11 is connected to the bottom of the housing 1a. The driving nose 11 extends downward. The lower end of the driving nose 11 forms an ejection port 12 through which the driving tool is ejected. A magazine 13 is provided at the rear of the driving nose 11.

[0020] The magazine 13 is loaded with connected driving tools, which are multiple driving tools connected in parallel at regular intervals. The connected driving tools are stored in a spiral configuration. A feed mechanism 14 is provided between the magazine 13 and the driving nose 11. The feed mechanism 14 feeds the connected driving tools into the driving passage 15 in a pitch manner in conjunction with the driving operation of the tool body 1. The feed mechanism 14 supplies the driving tools into the driving passage 15 one by one.

[0021] A contact arm 17 is provided on the driving nose 11 to switch between enabling and disabling the depressing operation of the trigger 16. The contact arm 17 is provided so as to be movable up and down relative to the driving nose 11. By bringing the contact arm 17 into contact with the workpiece to be driven and pressing down the driving tool 10, the contact arm 17 moves upward relative to the driving nose 11. The relative upward movement of the contact arm 17 enables the depressing operation of the trigger 16.

[0022] As shown in FIG. 1, a generally cylindrical cylinder 2 extending vertically is provided inside the housing 1a. The cylinder 2 slidably holds a disk-shaped piston 1c, which moves vertically inside the cylinder 2. A driver 1d, which is long in the vertical direction, is connected to the underside of the piston 1c. The tip of the driver 1d extends into a driving passage 15 inside the driving nose 11.

[0023] As shown in FIG. 1, a grip 3 that is held by the user is provided at the rear of the housing 1a. The grip 3 is generally cylindrical and extends rearward. A trigger 16 that is pulled by the user is provided below the base of the grip 3. An operating valve 5 is disposed above the trigger 16. When the trigger 16 is pulled upward with the fingertips holding the grip 3, the operating valve 5 is turned on. A communicating member 6 is attached to the outer periphery of the operating valve 5. Details of the operating valve 5 and the communicating member 6 will be described later.

[0024] As shown in Figures 1 and 4, an upstream pressure accumulator 3a is formed inside the grip 3 to store compressed air to be supplied to the tool body 1. An air plug 3b to which an air hose is connected is provided at the rear end of the grip 3. Compressed air is supplied from the air plug 3b to the upstream pressure accumulator 3a. A downstream pressure accumulator 1e is formed on the outer periphery of the upper part of the cylinder 2. The downstream pressure accumulator 1e is covered from above by a top cap 1b and is sealed from the outside. The downstream pressure accumulator 1e is connected to the upstream pressure accumulator 3a of the grip 3. Therefore, compressed air is supplied to the downstream pressure accumulator 1e from the upstream pressure accumulator 3a.

[0025] As shown in Figure 1, a substantially cylindrical main valve 4 is provided on the outer periphery of the cylinder 2. The main valve 4 is provided so as to be able to move up and down in order to open and close the cylinder upper chamber 2a above the piston 1c relative to the downstream pressure accumulator chamber 1e. As shown in Figure 2, a variable pressure chamber 4a is formed below the main valve 4. A compression spring 4b is provided in the variable pressure chamber 4a to bias the main valve 4 in the closing direction (upward). Multiple compression springs 4b are arranged at appropriate intervals around the circumference.

[0026] Air pressure from the downstream accumulator chamber 1e is constantly acting on the upper part of the main valve 4. Compressed air from the upstream accumulator chamber 3a is supplied to and exhausted from the variable pressure chamber 4a via a connecting member 6 and an operating valve 5. An exhaust passage 1f is provided above the operating valve 5. The exhaust passage 1f is constantly connected to the atmosphere via an atmospheric hole 1g (see Figure 4). Air from the variable pressure chamber 4a is also exhausted by being connected to the atmosphere.

[0027] As shown in Figure 2, in the initial state (non-operated state) of the driving tool 10, compressed air is supplied to the variable pressure chamber 4a from the upstream pressure accumulator chamber 3a through the operating valve 5 and the communicating member 6. As a result, the compressed air acts on both the upper and lower parts of the main valve 4. In this initial state, the main valve 4 moves upward due to the difference in pressure-receiving area between the upper and lower parts of the main valve 4 and the biasing force of the compression spring 4b. This causes the main valve 4 to be pressed against the seal ring 1h of the top cap 1b. As a result, the cylinder upper chamber 2a is maintained in a closed state relative to the downstream pressure accumulator chamber 1e.

[0028] As shown in Figure 3, when the trigger 16 is pulled to turn on the operating valve 5, the variable pressure chamber 4a is opened to the atmosphere via the communicating member 6, the operating valve 5, and the exhaust passage 1f. This switches to a state where no air pressure is applied to the variable pressure chamber 4a, causing the main valve 4 to receive compressed air from the downstream accumulator chamber 1e and move downward. As a result, the upper cylinder chamber 2a is opened to the downstream accumulator chamber 1e. This allows compressed air to be supplied to the upper cylinder chamber 2a, causing the piston 1c to move downward.

[0029] As the piston 1c moves downward, the driver 1d moves downward in the driving passage 15 (see Figure 1). The driver 1d strikes one driving tool supplied from the magazine 13 to the driving passage 15. The struck driving tool is ejected from the ejection port 12. The ejected driving tool is driven into the workpiece. When the piston 1c reaches its lower end, it is received by a lower moving end damper 1i provided in the driving nose 11. The lower moving end damper 1i absorbs the impact caused by the downward movement of the piston 1c.

[0030] As shown in Figure 3, when the driving operation is completed, some of the compressed air that has flowed into the cylinder upper chamber 2a flows through the check valve 2b into the return air chamber 2c. The air then acts on the underside of the piston 1c through the return hole 2d. On the other hand, when the trigger 16 is released after the driving operation, the operating valve 5 is turned off.

[0031] As shown in Figure 2, when the operating valve 5 is turned off, compressed air is supplied to the variable pressure chamber 4a through the operating valve 5 and the connecting member 6. This causes the main valve 4 to move upward due to the air pressure in the variable pressure chamber 4a and the biasing force of the compression spring 4b. As the main valve 4 moves upward, the cylinder upper chamber 2a is closed to the downstream accumulator chamber 1e and opened to the atmosphere. As a result, the piston 1c is returned to its upper end position by the compressed air in the return air chamber 2c. The piston 1c, which has moved to the upper end, is received by an upper end damper 1j provided in the top cap 1b. The upper end damper 1j absorbs the impact caused by the upward movement of the piston 1c.

[0032] The detailed structures of the operating valve 5 and the communicating member 6 are described below. As shown in Figure 5, the communicating member 6 is an injection-molded resin product. The communicating member 6 has a cylindrical tube main body 6a extending in the vertical direction and a cylindrical connecting pipe 6b extending forward perpendicularly from the tube main body 6a. The interior of the tube main body 6a and the interior of the connecting pipe 6b are connected to each other. A ring-shaped pipe seal 6c is attached to the outer peripheral surface of the connecting pipe 6b. The inner peripheral surface of the tube main body 6a has a concave surface 6d at its vertical center that is recessed relative to the surrounding inner peripheral surface. The concave surface 6d is formed around the entire circumference of the tube main body 6a.

[0033] The communicating member 6 also has an upstream restricting portion 6e that protrudes rearward relative to the cylindrical main body 6a, and a downstream restricting portion 6h that protrudes forward relative to the cylindrical main body 6a. The upstream restricting portion 6e has upstream left and right portions 6f that extend rectangularly from the cylindrical main body 6a in the left-right direction, and an upstream upper and lower portion 6g that extends rectangularly from the cylindrical main body 6a in the up-down direction. The upstream left and right portions 6f and the upstream upper and lower portions 6g are formed so as to intersect with each other. The downstream restricting portion 6h has downstream left and right portions 6i that protrude rectangularly from the cylindrical main body 6a in the left-right direction, and a downstream upper portion 6j that protrudes upward from the connecting pipe 6b. A pair of through holes 6k is formed in the downstream left and right portions 6i, aligned left and right across the connecting pipe 6b.

[0034] As shown in FIG. 2, the communicating member 6 is inserted from the rear end of the grip 3 into the upstream pressure accumulator chamber 3a and assembled to the valve accommodating chamber 1k of the housing 1a. The valve accommodating chamber 1k is located between the upstream pressure accumulator chamber 3a and the downstream pressure accumulator chamber 1e. The connecting pipe 6b is assembled to face the variable pressure chamber 4a from the rear. The connecting pipe 6b opens into the variable pressure chamber 4a. The outer peripheral surface of the connecting pipe 6b and the inner peripheral surface of the valve accommodating chamber 1k are airtightly sealed by a pipe sealant 6c. By assembling the communicating member 6, the variable pressure chamber 4a is connected to the upstream pressure accumulator chamber 3a via the connecting pipe 6b and the cylindrical main body 6a. The variable pressure chamber 4a is located on an extension of the connecting pipe 6b.

[0035] As shown in Figure 2, the downstream upper part 6j contacts the inner circumferential surface of the valve accommodating chamber 1k from below and behind. The upstream upper-lower part 6g contacts the inner circumferential surface of the grip 3 from the inside in the vertical direction. The downstream upper part 6j and the upstream upper-lower part 6g suppress rattle and rotation of the communicating member 6 in the vertical direction.

[0036] As shown in Figure 6, the upstream left and right portions 6f contact the inner circumferential surface of the grip 3 from the inside in the left-right direction. Furthermore, although not shown, the downstream left and right portions 6i contact the inner circumferential surface of the valve accommodating chamber 1k from the inside in the left-right direction. The upstream left and right portions 6f and the downstream left and right portions 6i suppress rattle and rotation of the communicating member 6 in the left-right direction. As a result, the communicating member 6 is easily fixed in position relative to the valve accommodating chamber 1k.

[0037] As shown in Figure 5, the actuated valve 5 has a first valve body 5a that is generally cylindrical and extends vertically, and a valve stem 5b that protrudes downward from the first valve body 5a. The first valve body 5a has intake and exhaust holes 5c formed at the axial center thereof and spaced apart circumferentially. A plurality of ring-shaped seals are attached to the outer circumferential surface of the first valve body 5a.

[0038] As shown in Figure 2, the first valve body 5a is inserted from below into the opening 1m of the valve accommodating chamber 1k and accommodated in the valve accommodating chamber 1k. An upper seal member 5d provides an airtight seal between the upper end of the first valve body 5a and the wall 1n of the valve accommodating chamber 1k. A lower seal member 5e provides an airtight seal between the lower end of the first valve body 5a and the opening 1m of the valve accommodating chamber 1k. As a result, the first valve body 5a is supported and fixed relative to the valve accommodating chamber 1k.

[0039] A communicating member 6 is provided in the valve accommodating chamber 1k in advance, and the first valve body 5a is inserted into the cylindrical body 6a of the communicating member 6 from below. By inserting the first valve body 5a, the communicating member 6 is held in the valve accommodating chamber 1k so as to be more stable. The first valve body 5a extends vertically longer than the inner circumferential width of the grip 3.

[0040] As shown in Figure 2, an annular flow passage 6m extending around the entire circumference is formed between the outer peripheral surface of the first valve body 5a and the concave surface 6d of the communicating member 6. The inner peripheral surface of the communicating member 6 outside the concave surface 6d and the outer peripheral surface of the first valve body 5a are airtightly sealed by a central sealant 5f. The supply and exhaust holes 5c of the first valve body 5a are connected to the annular flow passage 6m. An air supply hole 5g connected to the upstream accumulator chamber 3a is formed in the lower part of the first valve body 5a. An exhaust hole 5h connected to the exhaust path 1f is formed in the upper part of the first valve body 5a.

[0041] As shown in FIG. 2, a substantially cylindrical second valve body 5i extending vertically is provided inside the first valve body 5a. The second valve body 5i can slide vertically relative to the first valve body 5a. Between the first valve body 5a and the second valve body 5i are formed an air supply chamber 5j connected to the air supply hole 5g, an air supply / exhaust chamber 5k connected to the air supply / exhaust hole 5c, and an exhaust chamber 5m connected to the exhaust hole 5h. A valve stem 5b is inserted into the second valve body 5i from below. A compression spring 5p is provided between the valve stem 5b and the second valve body 5i. The compression spring 5p biases the valve stem 5b toward the off side (downward). The lower end of the valve stem 5b abuts against the trigger 16.

[0042] FIG. 2 shows the operating valve 5 in the off state. In the off state, the second valve body 5i moves upward relative to the first valve body 5a. This causes the ring-shaped air intake seal 5r attached to the outer peripheral surface of the second valve body 5i to move away from the inner peripheral surface of the first valve body 5a. Furthermore, the ring-shaped air exhaust seal 5s attached to the outer peripheral surface of the second valve body 5i is pressed against the inner peripheral surface of the first valve body 5a. This opens the air intake chamber 5j to the air intake and exhaust chamber 5k, and closes the exhaust chamber 5m to the air intake and exhaust chamber 5k. This connects the variable pressure chamber 4a to the upstream accumulator chamber 3a via the connecting pipe 6b, the annular flow path 6m, the air intake and exhaust chamber 5k, and the air intake chamber 5j. This allows compressed air from the upstream accumulator chamber 3a to be supplied to the variable pressure chamber 4a. As a result, the main valve 4 moves upward to block the downstream accumulator chamber 1e from the upper cylinder chamber 2a, as described above.

[0043] As shown in FIG. 3, when the trigger 16 is depressed, the valve stem 5b is pushed upward against the compression spring 5p. The compressed air acting on the inner periphery of the first valve body 5a then moves the second valve body 5i downward relative to the first valve body 5a. As the second valve body 5i moves downward, the air supply side sealant 5r is pressed against the inner periphery of the first valve body 5a. The exhaust side sealant 5s also moves away from the inner periphery of the first valve body 5a. This closes the air supply chamber 5j from the air supply / exhaust chamber 5k, and opens the exhaust chamber 5m from the air supply / exhaust chamber 5k. This connects the variable pressure chamber 4a to the exhaust passage 1f via the connecting pipe 6b, the annular flow path 6m, the air supply / exhaust chamber 5k, and the exhaust chamber 5m. This opens the variable pressure chamber 4a to the atmosphere. As a result, the main valve 4 moves downward, as described above, and the driving operation is performed.

[0044] As shown in FIGS. 4 and 6, an air passage 1p is formed between the communicating member 6 and the valve accommodating chamber 1k. The air passage 1p is located in front of the upstream accumulator chamber 3a and below the downstream accumulator chamber 1e. That is, compressed air flows forward from the upstream accumulator chamber 3a, bypassing the cylindrical body 6a. The compressed air then bends upward along the air passage 1p and flows into the downstream accumulator chamber 1e. As shown in FIG. 5, for example, compressed air flowing below the upstream left and right portions 6f must flow from bottom to top across the downstream left and right portions 6i. The through-holes 6k in the downstream left and right portions 6i allow the compressed air to easily pass through the downstream left and right portions 6i and flow upward. This reduces flow resistance in the air passage 1p, allowing air to flow efficiently.

[0045] As shown in FIG. 2, the communicating member 6 is formed as a separate member from the housing 1a and the grip 3. Therefore, the communicating member 6 is not easily affected by the configuration of the housing 1a and the grip 3. For example, the communicating member 6 can be formed thinly without considering the strength required for releasing the housing 1a from the mold. This makes it relatively easy to ensure the flow path width of the air passage 1p. This allows the air passage 1p to be formed as a flow path with relatively little flow resistance. This makes it less likely that the air passage 1p will obstruct the flow of air from the upstream pressure accumulator chamber 3a to the downstream pressure accumulator chamber 1e. As a result, the driving force of the piston 1c can be increased. Furthermore, for example, by forming the diameters of the piston 1c and the cylinder 2 smaller than conventional ones, the tool body 1 can be made smaller while maintaining the driving force of the driver 1d.

[0046] As described above, as shown in FIG. 1, the driving tool 10 has an upstream pressure accumulator 3a to which compressed air is supplied. An actuation valve 5 is disposed downstream of the upstream pressure accumulator 3a. A downstream pressure accumulator 1e is disposed downstream of the actuation valve 5. The downstream pressure accumulator 1e opens and closes relative to the cylinder 2 via a main valve 4. The main valve 4 opens when the air pressure in the variable pressure chamber 4a changes. The piston 1c in the cylinder 2 moves when the main valve 4 opens. The variable pressure chamber 4a communicates with the actuation valve 5 via a communicating member 6. The communicating member 6 is formed of a separate member from the members forming the upstream pressure accumulator 3a and the downstream pressure accumulator 1e. Therefore, the communicating member 6 is less affected by the configuration of the housing 1a that constitutes the pressure accumulator. For example, the communicating member 6 can be formed of a thin member without considering the demolding strength of the mold used to form the housing 1a. This allows for an expanded air flow path around the actuation valve 5. That is, an air flow path with little flow resistance to the air flow between the upstream pressure accumulator chamber 3a and the downstream pressure accumulator chamber 1e can be formed.

[0047] As shown in Figure 1, a tool body 1 houses a cylinder 2 and a downstream pressure accumulator chamber 1e. A grip 3 extends from the tool body 1 so as to intersect with the driving direction. The grip 3 houses an upstream pressure accumulator chamber 3a. An operating valve 5 is disposed at the connection point between the tool body 1 and the grip 3. Therefore, the grip 3 can be used as a pressure accumulator chamber.

[0048] 5, the communicating member 6 has a cylindrical body 6a through which the actuation valve 5 is inserted. A connecting pipe 6b extends from the cylindrical body 6a to the variable pressure chamber 4a. Therefore, the cylindrical body 6a is supported by the actuation valve 5.

[0049] 2, an annular flow passage 6m is formed between the inner peripheral surface of the cylindrical body 6a of the communicating member 6 and the outer peripheral surface of the actuation valve 5. The connecting pipe 6b is connected to the annular flow passage 6m. Therefore, the cylindrical body 6a is used as a flow passage leading to the connecting pipe 6b, and the cylindrical body 6a is supported by the actuation valve 5.

[0050] 2 and 6, the communicating member 6 has restricting portions 6e, 6h that protrude from the cylindrical body 6a. The restricting portions 6e, 6h restrict the rotation of the cylindrical body 6a relative to the tool body 1. Therefore, the communicating member 6 can be easily fixed in position relative to the tool body 1.

[0051] 2, the restricting portion 6e protrudes into the upstream pressure accumulator chamber 3a. The upstream pressure accumulator chamber 3a is located upstream of the operating valve 5 and is therefore less likely to affect the flow of air. Therefore, the restricting portion 6e can be provided relatively without considering air flow resistance.

[0052] As shown in Figure 5, the restriction portion 6e protrudes into the upstream pressure accumulator chamber 3a. The restriction portion 6h has a through hole 6k that allows air to flow from the upstream pressure accumulator chamber 3a to the downstream pressure accumulator chamber 1e. Because the downstream pressure accumulator chamber 1e is located downstream of the operating valve 5, air flow resistance is likely to occur if the downstream pressure accumulator chamber 1e becomes narrower. However, the restriction portion 6h has a through hole 6k. Therefore, even if the restriction portion 6h is provided in the downstream pressure accumulator chamber 1e, it is unlikely to cause resistance to air flow from the upstream pressure accumulator chamber 3a to the downstream pressure accumulator chamber 1e.

[0053] As shown in Figure 2, the connecting pipe 6b of the communicating member 6 extends perpendicular to the cylindrical main body 6a. The variable pressure chamber 4a is located in the direction in which the connecting pipe 6b extends. Therefore, the length of the connecting pipe 6b to the variable pressure chamber 4a is short. This allows the communicating member 6 to be made more compact.

[0054] As shown in FIG. 2, the actuation valve 5 is long in the extension direction of the tool body 1. Furthermore, both ends of the actuation valve 5 are supported at locations that extend beyond the cylindrical inner circumferential surface of the grip 3. Therefore, the support structure for the actuation valve 5 is formed outside the cylindrical inner circumferential surface of the grip 3. As a result, the actuation valve 5 does not need to be supported by a support portion that protrudes from the grip 3. Therefore, by eliminating or reducing the portion that protrudes from the inner circumferential surface of the grip 3, it is possible to avoid narrowing the connection point between the upstream accumulator chamber 3a and the downstream accumulator chamber 1e. This makes it possible to reduce air flow resistance.

[0055] As shown in Figure 2, in the manufacturing method of the driving tool 10, the communicating member 6 is inserted from the tip end side of the grip 3 toward the base end side. Then, the actuating valve 5 is inserted into the tool body 1 along the extension direction of the cylinder 2 and inserted into the communicating member 6. Therefore, the shape of the communicating member 6 is affected only by the inner circumferential wall of the grip 3. On the other hand, the actuating valve 5 is affected only by the inner circumferential wall of the hole extending in the extension direction of the cylinder 2. As a result, the shapes of the communicating member 6 and the actuating valve 5 are less likely to affect each other, and assembly is easy.

[0056] The above-described embodiment can be modified in various ways. For example, although a nail gun is used as an example of the driving tool, the present invention can also be applied to a compressed air-driven screw driver or stapler.

[0057] The communicating member may have only a connecting pipe connected to the variable pressure chamber without having a cylindrical body or a restricting portion. The connecting pipe may extend obliquely from the cylindrical body and be connected to the variable pressure chamber. The communicating member may be pre-assembled with the actuating valve and then attached to the tool body.

[0058] The operating valve may be configured to be shorter than the inner circumferential width of the grip. [Explanation of symbols]

[0059] 10. Driving Tools 11 Driving nose 12 Injection port 13 Magazine 14 Feeding mechanism 15 Drive-in Passage 16 Trigger 17 Contact Arm 1 Tool body 1a Housing 1b Top cap 1c piston 1d driver 1e Downstream accumulator 1f Exhaust duct 1g Large pore 1h Seal ring 1i Lower moving end damper 1j Upper moving end damper 1k Valve Chamber 1m opening 1n wall 1p Ventilation channel 2 cylinders 2a Cylinder upper chamber 2b Check valve 2c Return air chamber 2d Return hole 3 Grip 3a Upstream accumulator 3b Air plug 4 Body Valve 4a Transformer Room 4b Compression spring 5 Actuating valve 5a First valve body 5b valve stem 5c Supply and exhaust hole 5d Upper seal material 5e Bottom seal material 5f Central seal material 5g Air Intake 5h exhaust vent 5i Second valve body 5j Air supply room 5k supply and exhaust room 5m exhaust chamber 5p compression spring 5r Air intake side sealant 5s Exhaust side seal material 6 Connecting member 6a Cylinder body 6b Connecting pipe 6c Pipe sealing material 6d concave 6e Upstream regulation section (regulation section) 6f Upstream left and right 6g upstream upper and lower 6h Downstream regulation section (regulation section) 6i Downstream left and right 6j Upper downstream part 6k through hole 6m circular flow channel

Claims

1. A driving tool, an upstream pressure accumulator chamber to which compressed air is supplied; an actuated valve disposed downstream of the upstream pressure accumulator; a downstream accumulator located downstream of the actuation valve; a main body valve that opens and closes the downstream accumulator chamber and the cylinder; a communication member that communicates the variable pressure chamber that operates the main valve with the operating valve; the communicating member is formed as a separate member from the member forming the upstream pressure accumulator chamber and the member forming the downstream pressure accumulator chamber, The driving tool in which the air pressure in the variable pressure chamber is changed by the operating valve, thereby opening the main valve and moving the piston in the cylinder.

2. The driving tool according to claim 1, a tool body that accommodates the cylinder and the downstream accumulator; a grip extending from the tool body in a direction intersecting the driving direction and accommodating the upstream pressure accumulator chamber; A driving tool in which the operating valve is disposed at a connection point between the tool body and the grip.

3. The driving tool according to claim 1 or 2, The communication member is a cylindrical body into which the operating valve is inserted; A driving tool having a connecting pipe extending from the cylindrical body to the pressure change chamber.

4. The driving tool according to claim 3, A driving tool in which an annular flow passage connected to the connecting pipe is formed between the inner peripheral surface of the cylindrical body of the communicating member and the outer peripheral surface of the operating valve.

5. The driving tool according to claim 3 or 4, The connecting member has a restricting portion that protrudes from the cylindrical body so as to restrict rotation of the cylindrical body relative to the tool body.

6. The driving tool according to claim 5, A driving tool in which the restriction portion protrudes into the upstream pressure accumulator chamber.

7. The driving tool according to claim 5 or 6, The driving tool has a through hole in which the restricting portion projects into the upstream pressure accumulator chamber and allows flow from the upstream pressure accumulator chamber to the downstream pressure accumulator chamber.

8. The driving tool according to any one of claims 3 to 7, The connecting pipe of the communicating member extends perpendicular to the cylindrical main body, A driving tool in which the pressure change chamber is located in the extending direction of the connecting pipe.

9. The driving tool according to claim 2, The operating valve is a driving tool that is long in the extension direction of the tool body and is supported at points where both ends extend beyond the cylindrical inner surface of the grip.

10. A method for manufacturing a driving tool according to claim 2 or 9, The communication member is inserted from the distal end side of the grip toward the proximal end side, The method for manufacturing a driving tool includes inserting the operating valve into the tool body along the extending direction of the cylinder and then inserting the operating valve into the communicating member.

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