Driving tools

Abstract

To provide a driving tool in which an air chamber is provided compactly and which enables improvement of continuous workability.SOLUTION: A driving tool 1 includes: a cylinder 12 extending vertically; and a piston which is moved downward by a compression gas in the cylinder 12 and strikes a driving tool. The driving tool 1 has: a body housing 11 which houses the cylinder 12; and a grip 4 which extends rearward from a rear surface of the body housing 11. The driving tool 1 has an upper chamber which is provided above the cylinder 12 and communicates with the cylinder 12. The driving tool 1 has an air chamber 30 which extends downward from the upper chamber and extends only to a right side area with respect to an axis center 12a of the cylinder 12 and an axis center 4a of the grip 4.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to a driving tool for driving a driving tool such as a nail or staple into wood or the like. [Background technology]

[0002] Conventionally, gas spring-type driving tools have been proposed that use the thrust of compressed gas as a striking force. The gas spring-type driving tool has a piston that moves up and down within a cylinder and a driver that is integrally connected to the piston. The piston and driver are moved downward in the driving direction by gas pressure in an accumulator. The driver strikes and ejects a driving tool below. After ejecting the driving tool, the piston and driver are moved upward in the counter-driving direction by a lift mechanism and returned to their standby position.

[0003] The gas pressure in the pressure accumulator chamber is increased by the upward movement of the piston in the counter-driving direction. If the volume of the pressure accumulator chamber is small, the difference in gas pressure between the start of the driving operation and the time the driving tool is ejected is large. This makes it difficult to drive the driving tool with a strong impact force. By increasing the volume of the pressure accumulator chamber, the difference in gas pressure can be reduced, allowing the driving tool to be driven with a strong impact force. However, increasing the volume of the pressure accumulator chamber compromises the compactness of the driving tool. Therefore, a pressure accumulator chamber that is large in volume and compact is desired. Patent Document 1 discloses a gas spring-type driving tool that includes an upper chamber located above the piston and an air chamber extending downward from the upper chamber along the outer periphery of the cylinder as a pressure accumulator chamber.

[0004] When using the driving tool, the user grasps the grip and holds the driving tool around the vicinity of the trigger provided on the grip. The grip is attached to the tool body that houses the cylinder. It extends rearward from the periphery of the cylinder, intersecting the axial direction of the cylinder. The trigger is located at the front end of the grip. When the driving tool is driven, a reaction force is generated from the material being driven toward the injection port. The reaction force acts upward along the axial center of the cylinder. This reaction force generates a reaction that rotates the driving tool around the main body holding part near the trigger. Recoil occurs every time the driving tool is driven, and the user becomes tired from trying to maintain the position of the driving tool. This impairs continuous workability. Therefore, there was room for improvement in order to suppress the reaction force when the driving tool rotates due to the reaction force from the material being driven.

[0005] The air chamber disclosed in Patent Document 1 extends toward the rear of the cylinder and toward the front of the trigger. Therefore, the distance between the axial center of the cylinder and the body holder near the trigger is large. This makes it difficult to minimize the recoil of the driving tool during the driving operation. To minimize the recoil of the driving tool, for example, it is possible to provide the air chamber in front of the cylinder on the side opposite the trigger. However, this increases the front area of ​​the tool body, making it difficult to drive the driving tool into the edge of the workpiece adjacent to a wall. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] U.S. Patent No. 10,843,318 Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, there is room for improvement in the shape and arrangement of the air chamber of a gas spring type driving tool. Therefore, there is a need for a driving tool in which the air chamber is provided in a compact manner and which can improve continuous workability. [Means for solving the problem]

[0008] According to one aspect of the present disclosure, a driving tool has a cylinder that extends vertically and a piston that moves downward by compressed gas in the cylinder to strike a driving tool. The driving tool has a housing that accommodates the cylinder and a grip that extends rearward from the rear surface of the housing. The driving tool has an upper chamber that is provided above the cylinder and communicates with the cylinder. The driving tool has an air chamber that extends downward from the upper chamber and expands only to one of the left and right regions relative to the axial center of the cylinder and the axial center of the grip.

[0009] Therefore, by extending the air chamber downward from the upper chamber, the size of the upper region of the driving tool can be prevented from increasing. Furthermore, the air chamber is provided only in the region on either the left or right side of the axial center of the cylinder and the axial center of the grip. This allows the front-to-rear distance between the axial center of the cylinder and the front end of the grip to be shortened. The user grasps the grip and holds the driving tool around the front end of the grip as its center. Therefore, a reaction force from the material being driven generates a recoil that rotates the driving tool around the front end of the grip as its center. The positioning of the air chamber can prevent the recoil of the driving tool. Furthermore, the positioning of the air chamber can prevent the size of the front region of the driving tool from increasing. In this way, the air chamber can be compactly arranged around the cylinder, and the recoil of the driving tool during driving can be prevented, improving continuous workability. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. [Figure 2] FIG. 10 is a right side view of the driving tool with the right housing removed. [Figure 3] FIG. [Figure 4] FIG. 10 is a front view of the driving tool with the housing removed. [Figure 5] FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] FIG. 7 is a partially enlarged view of the upper part of the tool body in FIG. 6. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] FIG. 2 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 2 is a cross-sectional view taken along the line XX in FIG. [Figure 11] FIG. 4 is a left side view of the driving tool including a cross-sectional view taken along line XI-XI in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0011] According to another feature of the present disclosure, the air chamber has a front region located forward of the cylinder, a side region located on either the left or right side of the cylinder, and a rear region located rearward of the cylinder. The left-right width of the side region is wider than the front-to-rear width of the front region and the rear region. This reduces the amount of forward and rearward protrusion of the housing that accommodates the cylinder and air chamber. This reduces forward and rearward rotation of the driving tool due to recoil during driving.

[0012] According to another feature of the present disclosure, the front-to-rear width of the rear region is narrower than the front-to-rear width of the front region, which shortens the distance from the axial center of the cylinder to the front end of the grip, thereby more effectively suppressing the back-to-back rotation of the driving tool due to recoil during driving.

[0013] According to another feature of the present disclosure, the driving tool includes a driver that is provided below the piston and strikes the driving tool, and a magazine that supplies the driving tool to the driving passage of the driver. The magazine is connected to the housing in an area opposite the area on one side of the housing where the air chamber is provided. Therefore, by arranging the air chamber and the magazine on opposite sides of the cylinder, the left and right weight balance of the driving tool can be improved. This improves the feel of using the driving tool.

[0014] According to another feature of the present disclosure, the driving tool includes a lift mechanism that moves a driver that strikes the driving tool in a direction opposite to the driving direction. The lift mechanism is provided on the housing in a region on either the left or right side of the housing where the air chamber is provided. Therefore, in order to make the driving tool compact in the vertical direction, it is necessary to arrange the lift mechanism on either the left or right side of the housing so that it does not protrude vertically. Furthermore, by providing the lift mechanism and the air chamber so that they protrude from the same region on either the left or right side, the horizontal width of the housing that accommodates the lift mechanism and the air chamber can be made compact.

[0015] According to another feature of the present disclosure, the air chamber is provided so as not to overlap the cylinder in the vertical direction with respect to the axial center of the cylinder, thereby making it possible to make the front-to-rear width of the housing that accommodates the cylinder and the air chamber compact.

[0016] According to another feature of the present disclosure, a trigger that is operated to operate the tool is provided at the front end of the grip adjacent to the housing. An air chamber is provided so as not to be located between the trigger and the cylinder. This allows the distance between the axial center of the cylinder and the trigger to be shortened. The driving tool is held by the user with the vicinity of the trigger as its center. This prevents the driving tool from rotating around the vicinity of the trigger due to recoil during driving.

[0017] According to another feature of the present disclosure, the driving tool has a top cap provided on the top of a housing and accommodating an upper chamber. The driving tool also has a fill valve for filling the upper chamber with compressed gas. The fill valve is provided on one of the left and right side surfaces of the top cap, which is the same side as the air chamber. Therefore, the top cap is formed to protrude on the same left or right side as the air chamber, following the shape of the air chamber. The fill valve can be positioned using the space of the top cap that protrudes on one of the left and right sides. This allows the left and right width of the housing that accommodates the top cap and the air chamber to be compact. Furthermore, by providing the fill valve on one of the left and right sides of the top cap, the top cap can be configured so that its front-to-back width is compact.

[0018] Next, one embodiment of the present disclosure will be described with reference to FIGS. 1 to 13. As an example of the driving tool 1, a gas spring type driving tool will be shown, which uses gas pressure in a pressure accumulator above a cylinder as a thrust for driving a driving tool N. In the following description, the driving direction of the driving tool N will be referred to as a downward direction, and the opposite driving direction will be referred to as an upward direction. A user of the driving tool 1 is positioned approximately on the left side of the driving tool 1 in FIG. 1. The side in front of the user will be referred to as the rear direction (user side), and the far side opposite the front side will be referred to as the forward direction. The left and right directions are based on the user.

[0019] As shown in Figures 1, 2, and 6, the driving tool 1 has a tool body 10. The tool body 10 has a configuration in which a cylinder 12 is housed in a generally cylindrical body housing 11. A piston 13 is housed in the cylinder 12 so that it can move up and down reciprocally. The upper part of the cylinder 12 above the piston 13 is connected to a pressure accumulator chamber 14. A compressed gas, such as air, is sealed in the pressure accumulator chamber 14. The gas pressure in the pressure accumulator chamber 14 acts as a thrust on the upper surface of the piston 13, moving it downward.

[0020] As shown in Figure 6, the lower part of the cylinder 12 is connected to a driving passage 2a of the driving nose 2 provided at the bottom of the tool body 10. The driving nose 2 is connected to a magazine 8 in which a large number of driving tools N (see Figure 1) are loaded. The driving tools N are supplied from the magazine 8 one by one to the driving passage 2a in a position extending upward and downward. The magazine 8 extends toward the rear of the tool body 10, toward the left and upward of the tool body 10.

[0021] As shown in Figure 6, a vertically long driver 15 is connected to the underside of the piston 13. The lower part of the driver 15 enters the driving passage 2a. The driver 15 moves downward within the driving passage 2a due to the gas pressure in the pressure accumulator chamber 14 acting on the upper surface of the piston 13. The lower end of the driver 15 strikes a single driving tool N supplied into the driving passage 2a. The struck driving tool N is ejected from the ejection port 2b of the driving nose 2. The ejected driving tool N is driven into the workpiece W. A lower moving end damper 17 is arranged at the bottom of the cylinder 12 to absorb impact at the lower moving end of the piston 13.

[0022] 6 and 7, the piston 13 has a piston body 13a integrally connected to the driver 15, and a lid portion 13b connected to the top of the piston body 13a. Therefore, a hollow area covered by the piston body 13a and the lid portion 13b is formed in the top of the piston 13. This reduces the weight of the piston 13.

[0023] As shown in Figure 8, a plurality of engaged portions 16 are provided on the right side of the driver 15. The engaged portions 16 are arranged at predetermined intervals in the longitudinal direction (vertical direction) of the driver 15. Each engaged portion 16 is formed in a rack tooth shape and is provided so as to protrude to the right. The engaged portions 16 engage with an engaging portion 23 provided in the lift mechanism 20, which will be described later.

[0024] As shown in Figures 1 and 2, a grip 4 that is held by the user is provided at the rear of the tool body 10. A trigger 5 that is operated by the user by pulling it with a fingertip is provided on the underside of the front of the grip 4. A start switch 5a is housed inside the grip 4 above the trigger 5. When the user is not pulling the trigger 5 or when a microswitch 38 (see Figure 11), which will be described later, is in the off state, the start switch 5a is in the off state. When the user pulls the trigger 5 and the microswitch 38 is in the on state, the start switch 5a is in the on state.

[0025] As shown in Figures 1, 6, and 10, a battery mounting section 6 is provided at the rear of the grip 4. A battery pack 7 can be attached to the rear surface of the battery mounting section 6 in a vertically detachable manner. The battery mounting section 6 has a battery holder 6a that supports the battery pack 7 and a holder case 6b that is integral with the grip 4 and supports the battery holder 6a. The battery holder 6a is elastically supported relative to the holder case 6b so that it can slide in the attachment / detachment direction (vertical direction) of the battery pack 7. Therefore, if the tool body 10 receives an impact, for example, if the driving tool 1 is dropped, the elastic support structure of the battery holder 6a prevents the impact from being transmitted to the battery pack 7.

[0026] The battery pack 7 shown in Figures 1 and 2 can be removed from the battery attachment portion 6 and repeatedly charged and used with a separately provided charger. The battery pack 7 can also be used as a power source for other power tools. When the start switch 5a is in the on state, the battery pack 7 operates as a power source that supplies power to the electric motor 26 of the drive unit 25, which will be described later.

[0027] 5, the center of the trigger 5 is aligned with the axial center 4a of the grip 4 in the left-right direction. The center of the battery pack 7 attached to the battery attachment portion 6 is aligned approximately with the axial center 4a in the left-right direction.

[0028] As shown in Figure 2, the battery attachment section 6 accommodates a controller 28. The controller 28 is formed by accommodating a control board in a shallow rectangular box-shaped case. The controller 28 is installed in an orientation in which the thickness direction of the case is the front-to-rear direction. The controller 28 is electrically connected to the battery pack 7, the start switch 5a, the electric motor 26 of the drive section 25, the microswitch 38 (see Figure 4), etc.

[0029] 4 and 8, a lift mechanism 20 is connected to the right side of the driving nose 2. The lift mechanism 20 has the function of returning the piston 13 and driver 15 upward together after striking. When the lift mechanism 20 returns the piston 13 upward, the gas pressure in the pressure accumulator chamber 14 is increased.

[0030] As shown in Figures 1 and 2, a drive unit 25 for operating the lift mechanism 20 is provided in parallel to the rear of the lift mechanism 20. The lift mechanism 20 and drive unit 25 are housed in a substantially cylindrical drive unit case 11a. The drive unit case 11a connects the lower part of the main body housing 11 and the lower part of the battery attachment part 6. The drive unit case 11a is provided integrally with the main body housing 11.

[0031] As shown in Figure 2, the drive unit 25 has an electric motor 26 as a drive source. The electric motor 26 is housed in an orientation in which the axis of the output shaft (motor axis J) is aligned in the front-to-rear direction, perpendicular to the driving direction. The drive unit 25 has a reduction gear train 27 in front of the electric motor 26 and behind the lift mechanism 20. The rotation output of the electric motor 26 is reduced in speed by the reduction gear train 27 and output to the lift mechanism 20 in front.

[0032] As shown in FIG. 8, the lift mechanism 20 has a rotary shaft 21 whose rotation axis, coaxial with the motor axis J, extends in the front-rear direction, and a wheel 22 supported on the rotary shaft 21 so as to be rotatable integrally with the rotary shaft 21. The lift mechanism 20 is housed in a substantially cylindrical mechanism case 24 housed in the drive unit case 11a. The rotary shaft 21 is connected to the final gear train of the reduction gear train 27 (see FIG. 2). When the electric motor 26 is started, the rotary shaft 21 and wheel 22 of the lift mechanism 20 rotate integrally in the direction of arrow R (counterclockwise in FIG. 8).

[0033] As shown in FIG. 8, a plurality of engagement portions 23 are attached along the outer periphery of the wheel 22. Each engagement portion 23 uses a cylindrical shaft member (pin). The left portion of the wheel 22 enters the driving passage 2a through a window 24a provided in the mechanism case 24. Within the driving passage 2a, each engagement portion 23 of the wheel 22 engages with the engaged portion 16 of the driver 15. With at least one of the engagement portions 23 engaged with the engaged portion 16 of the driver 15, the wheel 22 is rotated in the direction of arrow R. This causes the driver 15 and piston 13 to return upward.

[0034] As shown in Figures 1 and 6, a contact arm 3 that can slide up and down is provided at the bottom of the driving nose 2. The contact arm 3 is biased downward. The lower end of the contact arm 3 is located below the injection port 2b when not in contact with the workpiece W. When the contact arm 3 comes into contact with the workpiece W, it moves upward against the biasing force.

[0035] As shown in Figure 11, the upper end 3a of the contact arm 3 extends upward at the front left of the driving nose 2. A microswitch 38 is provided above the upper end 3a. When the contact arm 3 comes into contact with the workpiece W (see Figure 1) and moves upward, the upper end 3a presses against the microswitch 38. This turns on the microswitch 38, detecting that the contact arm 3 is in contact with the workpiece W.

[0036] When the microswitch 38 shown in Fig. 11 is in the ON state and the trigger 5 shown in Fig. 6 is being pulled, the start switch 5a is turned ON and sends a signal to the controller 28. This causes power to be supplied from the battery pack 7 to the electric motor 26, starting the electric motor 26. When the pulling of the trigger 5 is stopped, the start switch 5a is turned OFF and the signal is cut off. As a result, the electric motor 26 continues to operate until the piston 13 and driver 15 return to their standby state, after which the power supply from the battery pack 7 is cut off and the electric motor 26 stops.

[0037] FIG. 8 shows the standby state of the piston 13 and driver 15. In the standby state, the piston 13 and driver 15 are held in a stopped state slightly below the upper end of their travel. When the electric motor 26 (see FIG. 6) is started from the standby state, the wheel 22 rotates in the direction indicated by the arrow R, and the piston 13 and driver 15 move upward from the standby position to the upper end of their travel. When the driver 15 moves to the upper end of their travel, a driving tool N (see FIG. 1) is supplied from the magazine 8 into the driving passage 2a. When the driver 15 reaches the upper end of its travel, the engaging portion 23 of the wheel 22 disengages from the engaged portion 16 of the driver 15. This causes the piston 13 and driver 15 to move downward due to the gas pressure in the pressure accumulator chamber 14. As the driver 15 moves downward within the driving passage 2a, one driving tool N is struck.

[0038] After the driving tool N strikes, the wheel 22 continues to rotate with the driver 15 reaching the bottom end. The engaging portion 23 of the rotating wheel 22 again engages with the engaged portion 16 of the driver 15, and the piston 13 and driver 15 are moved upward to a standby state. When the wheel 22 has rotated to the standby position, the start switch 5a and the electric motor 26 are turned off by a command signal from the controller 28 (see Figure 6). This stops the rotation of the wheel 22, and the piston 13 and driver 15 are held in a standby state. This completes the driving operation sequence.

[0039] 2 and 8, the lower part of the cylinder 12 is connected to and supported by the mechanism case 24. Anti-vibration rubber 37 is attached to both the left and right sides of the mechanism case 24. The anti-vibration rubber 37 is interposed radially between the main body housing 11 and the mechanism case 24. Therefore, the mechanism case 24 is elastically supported from both the left and right sides of the main body housing 11. This prevents shocks and the like received from outside the main body housing 11 from being transmitted to the inside of the tool body 10.

[0040] As shown in Figure 8, the pressure accumulator 14 is made up of an upper chamber 32 arranged above the cylinder 12 and an air chamber 30 arranged to the right of the cylinder 12. The air chamber 30 is formed inside a chamber case 31 provided along the outer circumferential surface of the cylinder 12. The upper chamber 32 is formed inside a top cap 33 connected to the upper end surface of the chamber case 31. The top cap 33 covers the cylinder 12 and the chamber case 31 from above. The top cap 33 and the chamber case 31 are provided in a range not exceeding forward of the front end position of the driving tool 1 that is required to provide other mechanisms such as the lift mechanism 20 and the contact arm 3.

[0041] As shown in FIG. 2, a cylindrical front boss 31a is provided on the front outer periphery of the chamber case 31. A cylindrical rear boss 31b is provided on the rear outer periphery of the chamber case 31. Insertion holes that penetrate vertically are provided in the front boss 31a and the rear boss 31b. A cylindrical front boss 33a is provided on the front outer periphery of the top cap 33. A cylindrical rear boss 33b is provided on the rear outer periphery of the top cap 33. Threaded holes that extend vertically are provided in the front boss 33a and the rear boss 33b. The insertion hole of the front boss 31a and the threaded hole of the front boss 33a, and the insertion hole of the rear boss 31b and the threaded hole of the rear boss 33b are aligned vertically and are connected by male screws. This connects the chamber case 31 and the top cap 33 in the vertical direction.

[0042] 7 and 8, the upper end surface 31c of the chamber case 31 and the lower end surface 33c of the top cap 33 face each other in the vertical direction. A seal member 35 is interposed between the upper end surface 31c and the lower end surface 33c. The seal member 35 is, for example, an O-ring with a diameter larger than the outer diameter of the cylinder 12. A groove capable of accommodating the seal member 35 is formed in the upper end surface 31c. As a result, the chamber case 31 and the top cap 33 are airtightly sealed by the seal member 35 with their faces abutting against each other in the vertical direction.

[0043] As shown in Figures 7 and 8, the cylinder abutment surface 31e on the radially inner side of the chamber case 31 and the outer peripheral surface of the cylinder 12 face each other in the radial direction of the cylinder 12. Two seal members 36 are interposed between the cylinder abutment surface 31e and the outer peripheral surface of the cylinder 12. The seal members 36 are, for example, O-rings with a diameter substantially the same as the outer diameter of the upper part of the cylinder 12. The two seal members 36 are arranged side by side one above the other. Two grooves that can accommodate the two seal members 36 are formed in the outer peripheral surface of the cylinder 12 in the circumferential direction, forming an annular shape. As a result, the chamber case 31 and the cylinder 12 are airtightly sealed by the seal members 36 while they are in face-to-face contact with each other in the radial direction of the cylinder 12. Thus, by being sealed by the seal members 35 and 36, the chamber case 31 and the top cap 33 cooperate to form an airtight pressure accumulator chamber 14.

[0044] As shown in FIGS. 7 and 8, the main body housing 11 has a radially inwardly projecting portion on its upper inner peripheral surface. A support rib 11b is provided. The support rib 11b is formed in an annular shape along the circumferential direction of the inner peripheral surface of the main housing 11. Two support ribs 11b are formed, one above the other. The inner peripheral ends of the two support ribs 11b face and abut against a housing abutment surface 31d on the radially outer side of the chamber case 31. The chamber case 31 is held by being sandwiched radially between the support rib 11b and the outer peripheral surface of the cylinder 12.

[0045] As shown in Figure 8, the chamber case 31 extends vertically along the outer circumferential surface of the cylinder 12. The upper end of the chamber case 31 is located slightly above the standby position of the piston 13. The lower end of the chamber case 31 extends approximately to the position where the trigger 5 is provided. A vibration-proof rubber 37 supported by the mechanism case 24 is disposed below the lower end of the chamber case 31. The lift mechanism 20 is disposed below the vibration-proof rubber 37. The right side surface of the main body housing 11 that houses the chamber case 31 is disposed within a range not exceeding to the right the right end of the drive unit case 11a that houses the lift mechanism 20 (see Figure 5).

[0046] As shown in Figure 10, the chamber case 31 has a generally crescent-shaped cross section perpendicular to the up-down direction. The radial inner surface of the chamber case 31 is aligned with the outer surface of the cylinder 12. The radial outer surface of the chamber case 31 is aligned with the inner surface of the main housing 11. The left end of the chamber case 31 is located to the right of the left-right axial center 12a of the cylinder 12 and the left-right axial center 4a of the grip 4. The right end of the chamber case 31 is located to the right of the trigger 5. Therefore, the air chamber 30 does not enter the area sandwiched between the cylinder 12 and the trigger 5 in the front-to-rear direction.

[0047] As shown in FIG. 10, the air chamber 30 forward of a front end position L1, which is the same fore-and-aft position as the front end of the cylinder 12, is referred to as the front region 30a. The air chamber 30 rearward of a rear end position L2, which is the same fore-and-aft position as the rear end of the cylinder 12, is referred to as the rear region 30e. The air chamber 30 between the front end position L1 and the rear end position L2 in the front-and-aft direction is referred to as the side region 30c. The front region 30a is formed with a generally constant front-and-aft width 30b at any position in the left-and-right direction. The rear region 30e is formed with a generally constant front-and-aft width 30f at any position in the left-and-right direction. The side region 30c is formed with a generally constant left-and-right width 30d at any position in the front-and-aft direction.

[0048] 10, the left-right width 30d of the side region 30c is wider than the front-rear width 30b of the front region 30a and wider than the front-rear width 30f of the rear region 30e. The front-rear width 30f of the rear region 30e is narrower than the front-rear width 30b of the front region 30a. The left-right width 30d is, for example, approximately 1.5 times the front-rear width 30b and approximately twice the length of the front-rear width 30f.

[0049] 9, a valve housing portion 33d in the form of a through-hole extending in the left-right direction is provided on the right side of the upper end of the top cap 33. A filling valve 34 for filling the upper chamber 32 and the air chamber 30 with compressed gas is housed in the valve housing portion 33d. The right end of the filling valve 34 is a supply port that can supply compressed gas from the outside, and is located at approximately the same left-right position as the right end face of the chamber case 31. The left end of the filling valve 34 is a discharge port that discharges compressed gas into the upper chamber 32, and is located slightly left of the right end of the cylinder 12.

[0050] 8 and 10, the driving tool 1 has a cylinder 12 that extends vertically, and a piston 13 that moves downward by the compressed gas in the cylinder 12 to strike the driving tool N. The driving tool 1 has a main body housing 11 that houses the cylinder 12, and a grip 4 that extends rearward from the rear surface of the main body housing 11. The driving tool 1 has an upper chamber 32 that is provided above the cylinder 12 and communicates with the cylinder 12. The driving tool 1 has an air chamber 30 that extends downward from the upper chamber 32 and expands only to the right side of the axial center 12a of the cylinder 12 and the axial center 4a of the grip 4.

[0051] Therefore, by extending the air chamber 30 downward from the upper chamber 32, the size of the upper region of the driving tool 1 can be prevented from increasing. Furthermore, the air chamber 30 is provided only in the region to the right of the axial center 12a of the cylinder 12 and the axial center 4a of the grip 4. This shortens the front-to-rear distance between the axial center 12a of the cylinder 12 and the front end of the grip 4. The user grasps the grip 4 and holds the driving tool 1 with the front end of the grip 4 as the center. Therefore, a reaction force from the workpiece W causes the driving tool 1 to rotate around the front end of the grip 4. The placement of the air chamber 30 can prevent the reaction of the driving tool 1. The placement of the air chamber 30 also prevents the size of the front region of the driving tool 1 from increasing. Thus, the air chamber 30 can be compactly placed around the cylinder 12, and the reaction of the driving tool 1 during driving is suppressed, improving continuous workability.

[0052] As shown in Figure 10, the air chamber 30 has a front region 30a located forward of the cylinder 12, a side region 30c located on either the left or right side of the cylinder 12, and a rear region 30e located rearward of the cylinder 12. The left-right width 30d of the side region 30c is wider than the front-to-rear width 30b of the front region 30a and the front-to-rear width 30f of the rear region 30e. This reduces the amount of front-to-rear projection of the main body housing 11, which houses the cylinder 12 and the air chamber 30. This reduces the front-to-rear rotation of the driving tool 1 due to recoil during driving.

[0053] 10, the front-rear width 30f of the rear region 30e is narrower than the front-rear width 30b of the front region 30a. This shortens the distance from the axial center 12a of the cylinder 12 to the front end of the grip 4. This effectively prevents the driving tool 1 from rotating back and forth due to recoil during driving.

[0054] As shown in Figure 8, the driving tool 1 has a driver 15 that is provided below the piston 13 and strikes the driving tool N (see Figure 1), and a magazine 8 that supplies the driving tool N to the driving passage 2a of the driver 15. The magazine 8 is connected to the main body housing 11 in an area on the left side, opposite the area on the right side of the main body housing 11 where the air chamber 30 is provided. Therefore, by arranging the air chamber 30 and the magazine 8 on opposite sides of the cylinder 12, the left and right weight balance of the driving tool 1 can be improved. This improves the feel of using the driving tool 1.

[0055] As shown in Figure 8, the driving tool 1 has a lift mechanism 20 that moves the driver 15 that strikes the driving tool N (see Figure 1) in the direction opposite to the driving direction. The lift mechanism 20 is provided on the main body housing 11 in an area on the right side of the main body housing 11 where the air chamber 30 is provided. Therefore, in order to make the driving tool 1 compact in the vertical direction, the lift mechanism 20 needs to be located on either the left or right side of the main body housing 11 so that it does not protrude vertically. Furthermore, by providing the lift mechanism 20 and the air chamber 30 in the same right side area, the left and right width of the main body housing 11 that accommodates the lift mechanism 20 and the air chamber 30 can be made compact.

[0056] 10, the air chamber 30 is provided so as not to overlap in the vertical direction with respect to the axial center 12a of the cylinder 12. Therefore, the front-to-rear width of the main body housing 11 that houses the cylinder 12 and the air chamber 30 can be made compact.

[0057] As shown in Figures 2 and 10, the trigger 5, which is operated to operate the tool, is provided at the front end of the grip 4 adjacent to the main body housing 11. The air chamber 30 is provided so as not to be located between the trigger 5 and the cylinder 12. This allows the distance between the axial center 12a of the cylinder 12 and the trigger 5 to be shortened. The driving tool 1 is held by the user with the vicinity of the trigger 5 as its center. This prevents the driving tool 1 from rotating around the vicinity of the trigger 5 due to recoil during driving.

[0058] As shown in FIG. 9 , the driving tool 1 has a top cap 33 that is provided on the top of the main housing 11 and houses the upper chamber 32. The driving tool 1 also has a fill valve 34 for filling the upper chamber 32 with compressed gas. The fill valve 34 is provided on the right side of the top cap 33, which is the same right side as the air chamber 30. Therefore, the top cap 33 is formed to protrude to the right to match the rightward protruding shape of the air chamber 30. The fill valve 34 can be located using the space of the top cap 33 that protrudes to the right. This allows the left-right width of the main housing 11 that houses the top cap 33 and the air chamber 30 to be compact. Furthermore, by providing the fill valve 34 on the right side of the top cap 33, the top cap 33 can be arranged so that its front-to-rear width is compact.

[0059] Various modifications can be made to the embodiment described above. For example, the arrangement of the air chamber 30, magazine 8, lift mechanism 20, fill valve 34, etc. is not limited to that illustrated. For example, the air chamber 30 may be arranged to the left of the cylinder 12. For example, the magazine 8 may be arranged to the right of the tool body 10. For example, the lift mechanism 20 may be arranged to the left of the driving nose 2. For example, the fill valve 34 may be arranged on the left side of the top cap 33.

[0060] The driving tool 1 has been exemplified in which the left-right axial center 12a of the cylinder 12 and the left-right axial center 4a of the grip 4 are at the same left-right position. Alternatively, the axial center 12a and the axial center 4a may be shifted left-right.

[0061] In the illustrated example, the start switch 5a is housed in the grip 4 above the trigger 5. Alternatively, for example, the start switch 5a may be housed in the battery attachment portion 6 at the rear of the grip 4. For example, the start switch 5a may be disposed between the lift mechanism 20 and the lower end of the chamber case 31.

[0062] The front-to-rear width 30b of the front region 30a, the left-to-right width 30d of the side regions 30c, and the front-to-rear width 30f of the rear region 30e of the air chamber 30 are not limited to those illustrated and may be changed as appropriate. For example, the front-to-rear width 30f of the rear region may be made extremely small, so that the air chamber 30 has a shape that almost does not have a rear region 30e. [Explanation of symbols]

[0063] 1...Driving tool 2... driving nose part, 2a... driving passage, 2b... injection port 3...contact arm, 3a...upper end 4...Grip, 4a...Axis center 5...Trigger, 5a...Start switch 6... Battery mounting portion, 6a... Battery holder, 6b... Holder case 7. Battery pack 8...Magazine 10...Tool body 11...Main body housing, 11a...Drive unit case, 11b...Support rib 12...cylinder, 12a...shaft center 13...piston, 13a...piston body, 13b...lid 14...Pressure chamber 15...Driver 16...Engaged portion 17...Lower moving end damper 20...Lift mechanism 21...Rotation axis 22...Wheels 23...Engagement portion 24...mechanism case, 24a...window portion 25...Drive unit 26...Electric motor 27...Reduction gear train 28...Controller 30...air chamber, 30a...front region, 30b...front-rear width, 30c...side region 30d…Left and right width, 30e…Back area, 30f…Front and rear width 31... chamber case, 31a... front boss portion, 31b... rear boss portion 31c... upper end surface, 31d... housing contact surface, 31e... cylinder contact surface 32...Upper chamber 33...top cap, 33a...front boss portion, 33b...rear boss portion 33c...lower end surface, 33d...valve accommodating portion 34...Filling valve 35, 36...Sealing members 37...Vibration-isolating rubber 38...Microswitch N...Driver W: Material to be driven J: Motor axis L1...front end position, L2...rear end position

Claims

1. A driving tool, A cylinder extending up and down; a piston that is moved downward by the compressed gas in the cylinder and strikes the driving tool; a housing that accommodates the cylinder; a grip extending rearward from a rear surface of the housing; an upper chamber provided above the cylinder and communicating with the cylinder; A driving tool having an air chamber that extends downward from the upper chamber, with the direction perpendicular to both the up-down direction in which the cylinder extends and the front-to-back direction in which the grip extends being the left-to-right direction, and that expands only to one of the left and right areas relative to the axial center of the cylinder and the axial center of the grip.

2. The driving tool according to claim 1, The air chamber is a front region located forward of the cylinder; a side region located on either the left or right side of the cylinder; a rear region located rearward of the cylinder, A driving tool in which the left-right width of the side regions is greater than the front-to-rear width of the front region and the rear region.

3. The driving tool according to claim 2, The driving tool has a rear region whose front-to-rear width is narrower than the front region whose front-to-rear width is narrower.

4. The driving tool according to any one of claims 1 to 3, a driver provided below the piston for striking the driving tool; A driving tool having a magazine that supplies the driving tools to the driving passage of the driver, the magazine being connected to the housing in an area opposite to the area on one of the left and right sides of the housing where the air chamber is provided.

5. The driving tool according to any one of claims 1 to 4, a lift mechanism for moving a driver that strikes the driving tool in a direction opposite to the driving direction; The driving tool, wherein the lift mechanism is provided on the housing in an area on one of the left and right sides of the housing where the air chamber is provided.

6. The driving tool according to any one of claims 1 to 5, The driving tool is such that the air chamber does not overlap in the vertical direction with respect to the axial center of the cylinder.

7. The driving tool according to any one of claims 1 to 6, a trigger that is operated when operating the tool is provided at a front end of the grip adjacent to the housing; The driving tool, wherein the air chamber is provided so as not to be located between the trigger and the cylinder.

8. The driving tool according to any one of claims 1 to 7, a top cap provided on an upper portion of the housing to accommodate the upper chamber; a fill valve for filling the upper chamber with compressed gas; The filling valve is provided on one of the left and right side surfaces of the top cap, which is the same side as the left and right side on which the air chamber is provided.

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