Electric driving tool

Abstract

To require an electric driving tool that can drive a driving tool by projecting a head from a material to be driven regardless of the shape of the driving tool.SOLUTION: A driving tool 1 has a driver 15 for driving a driving tool N. The driving tool 1 has a driver guide 4 for movably guiding the driver 15. The driving tool 1 has a contact arm 3 which is movably connected to the driver guide 4 in an anti-driving direction. The driving tool 1 has an adapter 30 which is detachably mounted in the contact arm 3. The adapter 30 separates a head Na of the driving tool N, which projects from the contact arm 3 in a driving direction and is driven by the driver 15, from a material W to be driven.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to an electric driving tool that drives a driving tool into a material to be driven, using, for example, a motor as a driving source.

Background Art

[0002] For example, a conventionally provided electric driving tool has a driver that strikes a driving tool, a driver guide having an ejection port at its tip and guiding the driver to the ejection port, and a contact arm that detects contact with the material to be driven. The driver operates using, for example, a motor powered by a battery as a driving source. With the contact arm pressed against the material to be driven, the motor is driven and the driver strikes the driving tool. The driving tool moves inside the driver guide together with the driver and is driven into the material to be driven from the ejection port. Usually, a driving tool such as a nail is driven so that its head is positioned following or slightly deeply embedded in the surface of the material to be driven.

[0003] For example, when assembling a formwork into which concrete is poured, the members of the formwork (materials to be driven) are temporarily fixed with driving tools. The formwork is disassembled after the concrete is molded. To facilitate disassembly of the formwork, it is desirable to drive the driving tool with its head protruding from the surface of the material to be driven. Thus, the formwork can be easily disassembled by pulling out the protruding head of the driving tool. Patent Document 1 describes a dedicated electric driving tool capable of driving a temporary fixing driving tool having two heads. This temporary fixing driving tool has a first head protruding radially at its tip and a second head protruding radially at a position spaced from the first head. The driving tool is driven until the second head hits the surface of the material to be driven. Therefore, the first head remains at a position protruding from the material to be driven.

[0004] By using a dedicated driving tool as described above, the first head can be easily protruded with respect to the material to be driven in. However, it is necessary to prepare a dedicated driving tool, a dedicated magazine, a power-driven driving tool, etc. Therefore, in the case of a nail having one head at the tip, which is generally widely used, the head cannot be protruded from the material to be driven in, lacking convenience.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, there is a need for a power-driven driving tool that can drive the driving tool with the head protruding from the material to be driven in regardless of the shape of the driving tool.

Means for Solving the Problems

[0007] According to one feature of the present disclosure, a power-driven driving tool has a driver for driving a driving tool. The power-driven driving tool has a driver guide for movably guiding the driver. The power-driven driving tool has a contact arm movably connected to the driver guide in the reverse driving direction. The power-driven driving tool has an adapter removably attached to the contact arm. The adapter protrudes in the driving direction from the contact arm and separates the head of the driving tool driven by the driver from the material to be driven in.

[0008] Therefore, the contact arm with the adapter attached protrudes longer in the driving direction than its original length. Thus, when the adapter is pressed against the material to be driven, the tip of the driver guide is away from the material to be driven in the counter-driving direction. At this time, the driving tool can be injected into the material to be driven. When injecting the driving tool, the driver reaches the bottom dead center. The tip of the driver at the bottom dead center is away from the material to be driven in the counter-driving direction. Therefore, the driving tool is not driven until the head reaches the depth at which it reaches the material to be driven. As a result, the head of the driving tool can be protruded from the surface of the material to be driven in the counter-driving direction. Moreover, the driving tool can be driven with the head protruding from the material to be driven regardless of the length, diameter, shape, etc. of the driving tool. Therefore, during disassembly work or the like, the protruding head of the driving tool can be easily pulled out.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0010] According to another feature of the present disclosure, the tip of the adapter protrudes 5 mm to 20 mm in the driving direction from the tip of the contact arm. Therefore, the head of the driving tool protrudes from the material to be driven with a length substantially the same as or slightly shorter than the protruding length of the adapter. Thus, the driving tool can be driven into the material to be driven so that the head protrudes at a height where it is easily pulled out.

[0011] According to another feature of the present disclosure, the adapter has a tip that is semi-circular arc-shaped or U-shaped when viewed from the driving direction. Therefore, the rigidity of the tip of the adapter against the load pressed against the material to be driven can be increased. Also, for example, when moving an electric driving tool to the next driving position, the head of the protruding driving tool can be escaped outward from the adapter through the opening of the semi-circular arc-shaped or U-shaped tip. Therefore, the working efficiency of the driving operation can be increased.

[0012] According to another feature of the present disclosure, the tip of the adapter is rectangular with one side open when viewed from the driving direction. Therefore, the tip of the adapter is made into a shape with higher rigidity. Thereby, the rigidity of the tip of the adapter against the pressing load can be further increased.

[0013] According to another feature of the present disclosure, the adapter has a main body including the tip. The main body has a cross-sectional shape perpendicular to the driving direction that is substantially the same as the tip in the region on the driving direction side of the tip of the contact arm. Therefore, the main body of the adapter can be provided with the same rigidity as the tip in the region on the driving direction side of the tip of the contact arm. Thus, the rigidity of the adapter against the pressing load can be increased. Also, the main body of the adapter forms a driving passage of the driver that extends straight in the driving direction from the ejection port of the driver guide in the region on the driving direction side of the tip of the contact arm. Thereby, the driver that has moved near the bottom dead center can be guided straight in the driving direction.

[0014] According to another feature of the present disclosure, the adapter has a cantilevered guide piece extending to the contact arm. The adapter has a hook protruding from the guide piece and engaging with the contact arm. Therefore, the guide piece is easily deflectable. Thus, the guide piece can be deflected to easily remove the hook engaged with the contact arm.

[0015] According to another feature of the present disclosure, the adapter has a main body in a semi-circular arc shape or a U shape in cross section that is thicker than the guide piece. Therefore, the guide piece is provided with rigidity that is easily deflectable, and the main body is provided with high rigidity. Thereby, the adapter can be easily removed from the contact arm while maintaining the rigidity of the adapter against the pressing load.

[0016] According to another feature of the present disclosure, the contact arm has a rail movably connected to the driver guide. The hook of the adapter engages with the end of the rail of the contact arm. Therefore, the adapter can be attached to the contact arm of an existing structure. Moreover, the adapter and the contact arm can be moved integrally with respect to the driver guide.

[0017] According to another feature of the present disclosure, the electric driving tool has a piston to which the driver is connected. The electric driving tool has a cylinder in which the piston is movably provided. The electric driving tool has a motor that returns the driver in the counter-driving direction to increase the gas pressure in the cylinder. Therefore, the adapter can be attached to a so-called gas spring type electric driving tool. Therefore, when the head of the driving tool is to be protruded from the surface of the material to be driven, the adapter is attached to the contact arm. When the head of the driving tool is to be driven into the material to be driven to a normal depth, the adapter is removed from the contact arm. Thus, by using an existing structure gas spring type electric driving tool, the driving depth of the driving tool can be easily switched by attaching and detaching the adapter.

[0018] According to another feature of the present disclosure, the driver is rectangular when viewed from the driving direction. The driver guide is rectangular and surrounds the driver when viewed from the driving direction. The adapter has a rectangular tip with three sides that follow the shape of the driver guide when viewed from the driving direction. The driver of the gas spring type electric driving tool has an engaged portion such as rack teeth that moves in the counter-driving direction, for example, by the drive of a motor. Therefore, the driver is provided with a rectangular cross-sectional shape perpendicular to the driving direction. Accordingly, the shape of the tip of the adapter is provided as a rectangle with three sides surrounding the driver with a rectangular cross-section. Thereby, the adapter and the driver guide cooperate to guide the driver straight in the driving direction.

[0019] Next, one embodiment of the present disclosure will be described with reference to FIGS. 1 to 12. As an example of the driving tool 1, a gas spring type driving tool that uses the gas pressure in the accumulator chamber as the thrust for driving the driving tool is shown. In the following description, the driving direction of the driving tool is downward, and the counter-driving direction is upward. The user of the driving tool 1 is generally located behind (the front side) of the driving tool 1. The back side opposite to the front side of the user is defined as the front direction. The left-right direction is based on the user.

[0020] As shown in FIGS. 1 and 5, 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 substantially cylindrical body housing 11. Inside the cylinder 12, a piston 14 is housed so as to be reciprocable vertically. The upper part of the cylinder 12 located above the piston 14 communicates with the accumulator chamber 13. Compressed gas such as air is enclosed in the accumulator chamber 13. The gas pressure in the accumulator chamber 13 acts as a thrust for biasing the upper surface of the piston 14 downward. The right part of the accumulator chamber 13 communicates with an air chamber 13a that extends downward. The air chamber 13a extends downward along the right side surface of the cylinder 12. The air chamber 13a is provided above a lift mechanism 22 described later. A cylindrical cushion 16 for absorbing the impact of the piston 14 that has moved downward to the bottom dead center is provided at the lower part of the cylinder 12.

[0021] As shown in FIGS. 3 and 5, a driving nose portion 2 having a driving passage 2a is provided at the lower part of the tool body 10. The driving passage 2a extends in the vertical direction and communicates with the lower part of the cylinder 12 at the upper end. A driver guide 4 forming the driving passage 2a is provided in the driving nose portion 2. A magazine 25 is connected to the rear portion of the driver guide 4. A plurality of driving tools N extending in the vertical direction and arranged in parallel in the front-rear direction are loaded in the magazine 25. The plurality of driving tools N are adhered to each other in a state of being arranged side by side in the front-rear direction. The driving tools N are supplied one by one forward from the magazine 25 toward the driving passage 2a. The driving tools N are supplied to the driving passage 2a with the head Na facing upward.

[0022] As shown in FIGS. 1 and 2, a contact arm 3 that can slide vertically with respect to the driver guide 4 is provided in the driving nose portion 2. The contact arm 3 is constantly biased to the lower off position. The contact arm 3 moves to the upper on position against the biasing force when it directly contacts or is indirectly pressed against the material W to be driven. The figure shows a state where the contact arm 3 and an adapter 30 described later have moved to the on position.

[0023] As shown in FIG. 1, a grip 5 for the user to hold extends in the front-rear direction at the rear part of the tool body 10. A trigger 6 that the user pulls with a fingertip is provided on the lower surface of the front part of the grip 5. A trigger switch 6a that switches from the off state to the on state in response to the pulling operation of the trigger 6 is provided inside the grip 5. When the contact arm 3 or the adapter 30 described later is pressed against the material W to be driven and moves to the upper on position, the pulling operation of the trigger 6 becomes effective. A battery mounting portion 7 extending in the vertical direction is provided on the rear surface of the grip 5. The battery 8 can be detachably mounted on the battery mounting portion 7. The battery 8 can be repeatedly charged with a charger prepared separately after being removed from the battery mounting portion 7. The battery 8 can be diverted as a power source for other power tools. The battery 8 supplies power to a motor 20 and the like described later.

[0024] As shown in Fig. 1, the main body housing 11 has a cylindrical drive unit case 11a that extends in the front-rear direction above the magazine 25. The rear part of the drive unit case 11a is connected to the lower part of the battery mounting part 7. The grip 5, the battery mounting part 7, and the drive unit case 11a cooperate to form a loop shape. In front of the battery mounting part 7, a controller 9 housed in a shallow-bottomed rectangular box-shaped case is provided. The controller 9 is housed in the main body housing 11 in a posture with the longitudinal direction generally in the vertical direction and the thickness direction in the front-rear direction. The controller 9 mainly controls the drive of the motor 20.

[0025] As shown in Fig. 5, the driving tool 1 has a driver 15 that strikes the driving tool N. The driving tool N is, for example, a nail that is generally widely used, and has only one radially protruding head Na at the tip. The driver 15 extends long in the vertical direction and is connected to the lower surface of the piston 14 at the upper end. The lower part of the driver 15 enters the driving passage 2a. The driver 15 moves downward by the gas pressure in the accumulator chamber 13 acting on the upper surface of the piston 14. The tip 15b at the lower end of the driver 15 strikes the head Na of one driving tool N supplied to the driving passage 2a while moving downward. The struck driving tool N is ejected from the ejection port 2c that opens at the lower end of the driving passage 2a. The ejected driving tool N is driven into the material W to be driven.

[0026] As shown in Fig. 5, a plurality of rack teeth (engaged parts) 15a protruding to the right are provided on the right side part of the driver 15. In this embodiment, nine rack teeth 15a are arranged side by side in the vertical direction. Each rack tooth 15a is provided in a triangular shape with the bottom facing the driving direction side (lower side). The bottom of the rack tooth 15a engages with the engaging part 24 of the lift mechanism 22 described later.

[0027] As shown in Fig. 1, a motor 20 as a drive source is housed in a drive unit case 11a. The motor 20 is housed in a posture with its motor axis J extending in the front-rear direction. The motor 20 is activated by being supplied with power from a battery 8 by the operation of a contact arm 3 including an adapter 30 and the operation of a trigger 6. A planetary reduction mechanism 21 is provided in front of the motor 20. A three-row planetary gear train is used in the planetary reduction mechanism 21. A lift mechanism 22 for moving a driver 15 upward is provided in front of the planetary reduction mechanism 21. The motor 20, the planetary reduction mechanism 21, and the lift mechanism 22 are arranged side by side on the motor axis J. The rotational drive of the motor 20 is reduced by the planetary reduction mechanism 21 and transmitted to the lift mechanism 22.

[0028] As shown in Fig. 5, the lift mechanism 22 is provided to the right of the driving nose portion 2. The lift mechanism 22 has a wheel 23 rotatable about the axis of the motor axis J. The wheel 23 is rotatable in the counterclockwise direction when viewed from the front, and its rotation in the clockwise direction is restricted. A plurality of engaging portions 24 are provided along the outer peripheral edge of the wheel 23. In this embodiment, for example, nine engaging portions 24 are provided. The engaging portion 24 is, for example, a columnar shaft member (pin) extending in the front-rear direction. Each engaging portion 24 is arranged at intervals in the circumferential direction of the wheel 23. As the wheel 23 rotates, each engaging portion 24 moves around the motor axis J, which is the center of rotation of the wheel 23.

[0029] As shown in Fig. 5, the upper part of the driving passage 2a is provided as a widened portion 2b that is wider in the left-right direction than the lower part. By providing the widened portion 2b, the rack teeth 15a can move vertically without interfering with the driving passage 2a. The left part of the wheel 23 enters the driving passage 2a through a window portion 11b provided in the right part of the widened portion 2b. Each engaging portion 24 of the wheel 23 engages with the bottom of the rack teeth 15a of the driver 15 within the driving passage 2a. With at least one of the engaging portions 24 engaged with the bottom of the rack teeth 15a, the wheel 23 rotates in the counterclockwise direction. As a result, the driver 15 and the piston 14 move upward, increasing the gas pressure in the accumulator chamber 13.

[0030] As shown in FIGS. 1 and 5, the magazine 25 is provided in a substantially rectangular box shape extending generally rearward from the driving nose portion 2. The magazine 25 is inclined leftward with respect to the tool body 10 toward the rear. The magazine 25 can accommodate a plurality of driving tools N. The front end of the magazine 25 opens toward the front driving passage 2a and communicates with the driving passage 2a. The magazine 25 is provided with a pusher 26 for supplying the driving tool N to the front driving passage 2a.

[0031] As shown in FIGS. 3, 7, and 8, the contact arm 3 projects downward from the ejection port 2c. The arm tip 3a, which is the lower end of the contact arm 3, abuts against the material W to be driven when the adapter 30 is not attached. On the outer surface of the driver guide 4, a pair of left and right rail engaging portions 4a extending linearly in the vertical direction are provided. On both the left and right sides of the contact arm 3, a pair of left and right rails 3b slidably engaged with the respective pair of rail engaging portions 4a are provided. The rail 3b has a semicircular arc shape or a U-shaped cross-sectional shape when viewed from the vertical direction. The rail 3b is also rectangular with one inner side in the left-right direction open and having three sides in the front, rear, and left-right outer directions. The pair of rails 3b are supported by the driver guide 4 so as to be movable in the vertical direction while sandwiching the pair of rail engaging portions 4a from both the left and right sides. At the rear end of the rail 3b, an end portion 3c extending in a planar shape in the left-right direction and the front-rear direction is provided.

[0032] As shown in FIGS. 7 and 8, an adjuster 27 is provided at the upper front portion of the driving nose portion 2. The adjuster 27 is provided in a columnar shape that is integrally formed with a rotary shaft 27a extending in the vertical direction and is rotatable about the axis. An adjuster connecting portion 3d connected to the rotary shaft 27a is provided at the upper front portion of the contact arm 3. The contact arm 3 and the adjuster 27 are integrally movable in the vertical direction. The adjuster 27 is biased downward by a compression spring 27b housed in the main body housing 11. Therefore, the contact arm 3 is also biased downward by the compression spring 27b. By rotating the adjuster 27 about the axis, the vertical position of the adjuster connecting portion 3d with respect to the rotary shaft 27a can be moved. Thereby, the protruding length of the contact arm 3 downward with respect to the ejection port 2c can be adjusted.

[0033] As shown in FIG. 7, a switch 28 housed in the main body housing 11 is provided above the adjuster 27. A protruding pin 28a that can be pushed upward is provided on the lower surface of the switch 28. By pushing the protruding pin 28a, the switch 28 transmits an on signal to the controller 9 (see FIG. 1). A U-shaped spring 28b is provided between the upper end of the rotary shaft 27a and the protruding pin 28a in the vertical direction when viewed from the left-right direction. One end of the spring 28b abuts against the upper end of the rotary shaft 27a. The other end of the spring 28b abuts against the lower end of the protruding pin 28a. When the contact arm 3 is located at the lower off position C1, the rotary shaft 27a is also located downward. Therefore, the protruding pin 28a is not pushed by the rotary shaft 27a via the spring 28b, and the switch 28 is in the off state. When the contact arm 3 is pushed by the material W to be driven and moves to the upper on position C2, the rotary shaft 27a also moves upward. Therefore, the protruding pin 28a is pushed by the rotary shaft 27a via the spring 28b, and the switch 28 transmits an on signal.

[0034] As shown in FIGS. 1, 6, and 8, an adapter 30 can be detachably attached to the lower part of the contact arm 3. The adapter 30 is integrally provided with a hard resin having high rigidity and high wear resistance, such as POM (polyacetal). The adapter 30 has a main body 31 provided with a tip 32 at the lower end, and a pair of guide pieces 33 provided on both the left and right sides of the main body 31. The tip 32 of the adapter 30 protrudes by a protruding length T downward from the arm tip 3a of the contact arm 3. The protruding length T is, for example, 5 mm to 20 mm, and more preferably 10 mm to 15 mm.

[0035] As shown in FIGS. 1, 6, and 8, a planar front wall 31a extending in the left-right direction and the up-down direction is provided on the front side of the main body 31. A planar right wall 31b extending in the front-rear direction and the up-down direction is provided on the right side of the main body 31. The right wall 31b is connected to the right end of the front wall 31a substantially orthogonally. A planar left wall 31c extending in the front-rear direction and the up-down direction is provided on the left side of the main body 31. The left wall 31c is connected to the left end of the front wall 31a substantially orthogonally.

[0036] As shown in FIGS. 4, 8, and 12, the tip 32 is in a semi-circular arc shape or a U shape with an opening at the rear when viewed from below. The tip 32 is also in a rectangular shape surrounded by three sides, namely the front, right, and left sides, with an opening at the rear when viewed from below. The main body 31 has a cross-sectional shape orthogonal to the up-down direction that is substantially the same as the shape of the tip 32 at any height in the up-down direction in the region in the driving direction (downward) from the arm tip 3a of the contact arm 3 (see FIG. 5). The shape of the tip 32 is a rectangular shape following the rectangular shape of the driver guide 4 surrounding the driver 15.

[0037] As shown in FIGS. 1, 8, and 11, a rib-shaped indicator 31f that protrudes forward and extends in the vertical direction is provided on the front wall 31a. The indicator 31f is at the center in the left-right direction of the driver 15, in other words, it indicates the position in the left-right direction of the driving tool N (see FIG. 3) to be driven. On the right wall 31b and the left wall 31c, rib-shaped indicators 31g that protrude outward in the left and right directions and extend in the vertical direction are provided. The indicator 31g is at the center in the front-rear direction of the driver 15, in other words, it indicates the position in the front-rear direction of the driving tool N to be driven. At the upper end of the front wall 31a, which is the upper end 31d of the main body 31, an arm engaging portion 31e is provided where the arm tip 3a of the contact arm 3 enters and engages.

[0038] As shown in FIGS. 8, 9, and 11, the guide piece 33 includes a right guide piece 33a provided on the right side and a left guide piece 33b provided on the left side. The right guide piece 33a and the left guide piece 33b extend upward from the main body 31 substantially parallel to each other and facing each other. The right guide piece 33a extends upward in a cantilever shape from a base portion 33e connected to the upper right portion of the main body 31. The left guide piece 33b extends upward in a cantilever shape from a base portion 33f connected to the upper left portion of the main body 31. Since the rack teeth 15a are provided only on the right side of the driver 15 and the driver guide 4 is left-right asymmetric, the base portion 33e and the base portion 33f are provided in an asymmetric shape following the shape of the driver guide.

[0039] As shown in FIGS. 8 to 10, the guide piece 33 has a long hole 33d extending in the vertical direction. The long hole 33d is provided at the center of the guide piece 33 in the front-rear direction. The long hole 33d extends long from the vicinity of the bases 33e, 33f to the vicinity of the upper end of the guide piece 33. At the upper end of the guide piece 33, a hook 33c protruding in the left-right direction is provided. The hook 33c is provided in a rectangular shape when viewed from the vertical direction, and the tip is provided in a flat shape. The hook 33c of the right guide piece 33a protrudes leftward. The hook 33c of the left guide piece 33b protrudes rightward. The hooks 33c of the right guide piece 33a and the left guide piece 33b face each other in the left-right direction. The pair of hooks 33c engages with the end 3c of the rail 3b of the contact arm 3 (see FIG. 3). Thereby, the adapter 30 can be attached to the contact arm 3. The adapter 30 moves integrally with the contact arm 3 in the vertical direction between the off position and the on position.

[0040] As shown in FIG. 3, the right guide piece 33a and the left guide piece 33b are provided with a thickness D2 in the left-right direction. The thickness D2 is thinner than the thickness D1 of the main body 31 in the left-right direction at the tip 32. Therefore, the cantilever-like right guide piece 33a and left guide piece 33b are more likely to bend in the left-right direction than the main body 31. The hook 33c that engages with the end 3c of the rail 3b can be removed.

[0041] As shown in FIGS. 9 and 11, rear surface ribs 33g protruding in the left-right direction are provided at the rear portions of the bases 33e, 33f. The contact arm 3 is inserted between the front wall 31a and the rear surface rib 33g in the front-rear direction (see FIG. 4). Thereby, the adapter 30 can be positioned in the front-rear direction with respect to the contact arm 3.

[0042] As shown in Fig. 7, when the adapter 30 is not attached to the contact arm 3, the tip 3a of the contact arm 3 is pressed against the material W to be driven in and moves upward to the on position C2. As a result, the driver N is ejected from the ejection port 2c. In the figure, the tip 15b of the driver 15 enters the material W to be driven in, but in reality, the downward movement of the driver 15 is stopped at the stage when the tip 15b contacts the material W to be driven in. Therefore, the driver 15 does not move to the bottom dead center, which is the most movable lower end. The driver N is driven in until the head Na reaches a depth following the surface of the material W to be driven in.

[0043] As shown in Fig. 6, when the adapter 30 is attached to the contact arm 3, the tip 32 of the adapter 30 is pressed against the material W to be driven in and moves upward to the on position C2. As a result, the driver N is ejected from the ejection port 2c. When the cushion 16 is most deflected and the driver 15 moves to the bottom dead center, the tip 15b of the driver 15 is located below the ejection port 2c and above the tip 32 of the adapter 30. Therefore, the tip 15b of the driver 15 does not reach the surface of the material W to be driven in. The driver N struck by the driver 15 is driven in until the head Na protrudes from the surface of the material W to be driven in by a protruding length H. The protruding length H of the head Na is approximately the same as or shorter than the protruding length T of the tip 32 of the adapter 30 with respect to the tip 3a of the contact arm 3. The protruding length H of the head Na is, for example, 10 mm to 15 mm. The protruding length H of the head Na is substantially constant regardless of the length, diameter, shape, etc. of the driver N.

[0044] Next, a series of processes of the driving operation of the driving tool 1 will be described with reference to FIGS. 1, 5, and 6. The figure shows the state where the driver 15 has moved to the bottom dead center by the driving operation. First, the driver 15 stops at a standby position slightly below the top dead center in the previous stage of the driving operation. At this time, the bottom surface of the lowermost rack tooth 15a engages with the engaging portion 24 of the lift mechanism 22. When the tip 32 of the adapter 30 is pressed against the material W to be driven, the contact arm 3 and the adjuster 27 connected to the adapter 30 move from the off position C1 to the on position C2. The rotation shaft 27a of the adjuster 27 presses the switch 28 via the spring 28b. The switch 28 transmits an on signal to the controller. The controller 9 starts the motor 20 upon receiving the on signal from the switch 28 and when the trigger 6 is pulled.

[0045] When the motor 20 is started, the wheel 23 of the lift mechanism 22 rotates. The lowermost rack tooth 15a moves upward by the engaging portion 24 that moves along with the rotation of the wheel 23. As a result, the driver 15 moves upward from the standby position to the top dead center. When reaching the state just before driving at the top dead center, the engaging portion 24 disengages from the bottom of the lowermost rack tooth 15a. As a result, the driver 15 is urged downward by the gas pressure in the accumulator chamber 13 applied to the piston 14. In the driving passage 2a, while the driver 15 moves from the standby position to the top dead center, the foremost driving tool N is supplied from the magazine 25. The tip 15b of the driver 15 moves downward in the driving passage 2a and strikes the head Na of one driving tool N. When the driver 15 moves downward, all the engaging portions 24 retreat to the right of the widened portion 2b of the driving passage 2a. Therefore, interference between the rack tooth 15a of the downward-moving driver 15 and the engaging portion 24 is avoided, and a smooth driving operation is performed.

[0046] By attaching the adapter 30 to the contact arm 3, the tip 15b of the driver 15 stops at the bottom dead center above the material W to be driven. The driving tool N is driven to a depth at which the head Na projects from the material W to be driven by a protruding length H. The wheel 23 continues to rotate even while the driver 15 is moving downward and after reaching the bottom dead center. When the driver 15 is at the bottom dead center and the wheel 23 rotates to a predetermined rotation angle, one of the engaging portions 24 engages with the bottom of the uppermost rack tooth 15a. Thereby, a return operation for moving the driver 15 upward is started. When one of the engaging portions 24 engages with the bottom of the lowermost rack tooth 15a, the driver 15 returns to the standby position. For example, by appropriately controlling the time from the start of activation of the motor 20, the motor 20 is stopped at the stage when the piston 14 reaches the standby position. Thereby, the driver 15 is held at the standby position. Thus, a series of driving operations is completed.

[0047] As described above, the driving tool (electric driving tool) 1 has a driver 15 for driving the driving tool N as shown in FIG. 6. The driving tool 1 has a driver guide 4 for movably guiding the driver 15. The driving tool 1 has a contact arm 3 movably connected to the driver guide 4 in the counter-driving direction (upward). The driving tool 1 has an adapter 30 removably attached to the contact arm 3. The adapter 30 projects from the contact arm 3 in the driving direction and separates the head Na of the driving tool N driven by the driver 15 from the material W to be driven.

[0048] Therefore, the contact arm 3 with the adapter 30 attached projects longer in the driving direction than its original length. Therefore, when the adapter 30 is pressed against the material W to be driven, the tip of the driver guide 4 (the ejection port 2c) is separated from the material W to be driven in the reverse driving direction. At this time, the driving tool N can be ejected into the material W to be driven. When ejecting the driving tool N, the driver 15 reaches the bottom dead center. The tip 15b of the driver 15 at the bottom dead center is separated from the material W to be driven in the reverse driving direction. Therefore, the driving tool N is not driven until the head Na reaches the depth at which it reaches the material W to be driven. As a result, the head Na of the driving tool N can be protruded from the surface of the material W to be driven. Moreover, regardless of the length, diameter, shape, etc. of the driving tool N, the driving tool N can be driven with the head Na protruding from the material W to be driven. Therefore, during disassembly work or the like, the protruding head of the driving tool can be easily pulled out.

[0049] As shown in FIG. 6, the tip 32 of the adapter 30 protrudes 5 mm to 20 mm in the driving direction from the arm tip 3a of the contact arm 3. Therefore, the head Na of the driving tool N protrudes from the material W to be driven with a length substantially the same as or slightly shorter than the protruding length T of the adapter 30. Therefore, the driving tool N can be driven into the material W to be driven so that the head Na protrudes at a height that is easy to pull out.

[0050] As shown in FIGS. 3, 4, and 12, the adapter 30 has a tip 32 that is semi-circular arc-shaped or U-shaped when viewed from the driving direction. Therefore, the rigidity of the tip 32 of the adapter against the load pressed against the material W to be driven can be increased. Also, for example, when moving the driving tool 1 to the next driving position, the head Na of the protruding driving tool N can be escaped outward from the adapter 30 through the opening of the semi-circular arc-shaped or U-shaped tip 32. Therefore, the working efficiency of the driving operation can be increased.

[0051] As shown in FIGS. 4 and 12, the tip 32 of the adapter 30 has a rectangular shape with one side open when viewed in the driving direction. Therefore, the tip 32 of the adapter 30 is made into a shape with higher rigidity. Thereby, the rigidity of the tip 32 of the adapter 30 against the pressing load can be further increased.

[0052] As shown in FIGS. 3, 8, and 11, the adapter 30 has a main body 31 including the tip 32. The main body 31 has a cross-sectional shape orthogonal to the driving direction in a region on the driving direction side of the arm tip 3a of the contact arm 3 that is substantially the same as the shape of the tip 32. Therefore, the main body 31 of the adapter 30 can be provided with the same rigidity as the tip 32 in a region on the driving direction side of the arm tip 3a of the contact arm 3. Therefore, the rigidity of the adapter 30 against the pressing load can be increased. Further, the main body 31 of the adapter 30 forms a driving passage 2a of the driver 15 that extends straight in the driving direction from the ejection port 2c of the driver guide 4 in a region on the driving direction side of the arm tip 3a of the contact arm 3. Thereby, the driver 15 moved near the bottom dead center can be guided straight in the driving direction.

[0053] As shown in FIGS. 3, 8, and 9, the adapter 30 has a cantilever-like guide piece 33 that extends to the contact arm 3. The adapter 30 has a hook 33c that protrudes from the guide piece 33 and engages with the contact arm 3. Therefore, the guide piece 33 is easily bent. Therefore, the hook 33c engaged with the contact arm 3 can be easily removed by bending the guide piece 33.

[0054] As shown in FIGS. 3 and 11, the adapter 30 has a main body 31 with a cross-sectional semi-circular arc shape or U-shaped that is thicker than the guide piece 33. Therefore, the guide piece 33 is provided with a rigidity that is easily bent and the main body 31 is provided with a high rigidity. Thereby, the adapter 30 can be easily removed from the contact arm 3 while maintaining the rigidity of the adapter 30 against the pressing load.

[0055] As shown in FIGS. 3 and 8, the contact arm 3 has a rail 3b that is movably connected to the driver guide 4. The hook 33c of the adapter 30 engages with the end of the rail 3b of the contact arm 3. Therefore, the adapter 30 can be attached to the contact arm 3 of the existing structure. Moreover, the adapter 30 and the contact arm 3 can be moved integrally with respect to the driver guide 4.

[0056] As shown in FIG. 5, the driving tool 1 has a piston 14 to which a driver 15 is connected. The driving tool 1 has a cylinder 12 in which the piston 14 is movably provided. The driving tool 1 has a motor 20 that returns the driver 15 in the counter-driving direction to increase the gas pressure in the cylinder 12. Therefore, the adapter 30 can be attached to a so-called gas spring type driving tool 1. Therefore, when the head Na of the driving tool N protrudes from the surface of the material W to be driven, the adapter 30 is attached to the contact arm 3. When the head Na of the driving tool N is driven into the material W to be driven to a normal depth, the adapter 30 is removed from the contact arm 3. Thus, by using a gas spring type driving tool 1 of an existing structure, the driving depth of the driving tool N can be easily switched by attaching and detaching the adapter 30.

[0057] As shown in FIG. 4, the driver 15 is rectangular when viewed from the driving direction. The driver guide 4 is rectangular and surrounds the driver 15 when viewed from the driving direction. The adapter 30 has a rectangular tip 32 with three sides following the shape of the driver guide 4 when viewed from the driving direction. The driver 15 of the gas spring type driving tool 1 has an engaged portion such as a rack tooth 15a that is movable in the counter-driving direction by, for example, the drive of the motor 20. Therefore, the driver 15 is provided with a rectangular cross-sectional shape orthogonal to the driving direction. Therefore, the shape of the tip 32 of the adapter 30 is provided as a rectangle with three sides surrounding the driver 15 having a rectangular cross-section. Thereby, the adapter 30 and the driver guide 4 cooperate to guide the driver 15 straight in the driving direction.

[0058] Various modifications can be made to the driving tool 1 of the present disclosure described above. The gas spring type driving tool 1 has been exemplified. Instead of this, for example, the present disclosure may be applied to a mechanical spring type driving tool that ejects the driver by utilizing a spring force such as a mechanical compression spring generated when the driver is moved in the counter-driving direction by a lift mechanism. For example, the present disclosure may be applied to a flywheel type driving tool that ejects the driver by utilizing the inertial force of a flywheel. For example, the present disclosure may be applied to an electro-pneumatic type driving tool that utilizes compressed air generated by rotating a crank with a motor.

[0059] The length, diameter, shape, etc. of the driving tool N are not limited to those exemplified and may be changed as appropriate. The magazine 25 that slopes to the left toward the rear has been exemplified. Instead of this, the magazine 25 may, for example, extend straight toward the rear. For example, the magazine 25 may slope upward as it moves away from the driving nose portion 2.

[0060] The adapter 30 having a rectangular shape with one side in the region below the tip 32 and the arm tip 3a of the main body 31 opening when viewed from below has been exemplified. Instead of this, the region below the tip 32 and the arm tip 3a of the main body 31 may, for example, be arc-shaped or U-shaped with the whole or a part thereof being formed of a curved surface when viewed from below.

[0061] The adapter 30 having two right guide pieces 33a and left guide pieces 33b has been exemplified. Instead of this, the adapter 30 may, for example, be provided with only one of the right guide piece 33a or the left guide piece 33b. For example, the adapter 30 may be provided with other guide pieces in addition to the right guide piece 33a and the left guide piece 33b. The configuration in which the hook 33c engages with the rail 3b of the contact arm 3 from the outside in the left-right direction and the engagement between the hook 33c and the rail 3b is released by deflecting the guide piece 33 from the inside to the outside in the left-right direction has been exemplified. Instead of this, for example, the hook 33c may engage with the contact arm 3 from the inside to the outside in the left-right direction, and the configuration in which the engagement between the hook 33c and the contact arm 3 is released by deflecting the guide piece 33 from the outside to the inside in the left-right direction may also be acceptable.

Description of Symbols

[0062] 1… Driving tool (electric driving tool) 2… Driving nose part, 2a… Driving passage, 2b… Widening part, 2c… Ejection port 3… Contact arm, 3a… Arm tip, 3b… Rail, 3c… End part (hooking part) 3d… Adjuster connecting part 4… Driver guide, 4a… Rail engaging part 5… Grip 6… Trigger, 6a… Trigger switch 7… Battery mounting part 8… Battery 9… Controller 10… Tool body 11… Main body housing, 11a… Driving part case, 11b… Window part 12… Cylinder 13… Accumulator chamber, 13a… Air chamber 14… Piston 15… Driver, 15a… Rack teeth (engaged part), 15b… Tip 16… Cushion 20… Motor 21… Planetary reduction gear mechanism 22… Lift mechanism 23… Wheel 24… Engaging part, 24a… Final engaging part 25… Magazine 26… Pusher 27… Adjuster, 27a… Rotation shaft, 27b… Compression spring 28… Switch, 28a… Protruding pin, 28b… Spring 30… Adapter 31… Main body, 31a… Front wall, 31b… Right wall, 31c… Left wall, 31d… Upper end 31e… Arm engaging part, 31f, 31g… Indicators 32… Tip 33… Guide piece, 33a… Right guide piece, 33b… Left guide piece, 33c… Hook 33d… Long hole, 33e, 33f… Bases, 33g… Rear rib N… Driving tool, Na… Head W… driven material C1… off position, C2… on position T… protrusion length (of the adapter) H… protrusion length (of the head of the driving tool) D1, D2… thickness J… motor axis

Claims

1. An electric driving tool, comprising: a driver for driving a driving tool; a driver guide for movably guiding the driver; a contact arm movably connected to the driver guide in the counter-driving direction; an adapter removably attached to the contact arm; The adapter protrudes from the contact arm in the driving direction to separate the head of the driving tool driven by the driver from the material to be driven, which is an electric driving tool.

2. The electric driving tool according to claim 1, wherein: the tip of the adapter protrudes 5 mm to 20 mm in the driving direction from the tip of the contact arm, which is an electric driving tool.

3. The electric driving tool according to claim 1 or 2, wherein: the adapter has a tip in a semi-circular arc shape or a U-shape when viewed from the driving direction, which is an electric driving tool.

4. The electric driving tool according to claim 3, wherein: the tip of the adapter has a rectangular shape with one side open when viewed from the driving direction, which is an electric driving tool.

5. The electric driving tool according to claim 3 or 4, wherein: the adapter has a body including the tip; in a region on the driving direction side of the tip of the contact arm, the cross-sectional shape perpendicular to the driving direction of the body is substantially the same as the shape of the tip, which is an electric driving tool.

6. The electric driving tool according to any one of claims 1 to 5, wherein: the adapter has a cantilever-shaped guide piece extending to the contact arm and a hook protruding from the guide piece and engaging with the contact arm, which is an electric driving tool.

7. The electric driving tool according to claim 6, wherein: the adapter has a body with a cross-sectional semi-circular arc shape or a U-shape that is thicker than the guide piece, which is an electric driving tool.

8. The electric driving tool according to claim 6 or 7, wherein: the contact arm has a rail movably connected to the driver guide; the hook of the adapter engages with an end of the rail of the contact arm, which is an electric driving tool.

9. The electric driving tool according to any one of claims 1 to 8, wherein: a piston to which the driver is connected; a cylinder in which the piston is movably provided; An electric driving tool having a motor that returns the driver in the reverse driving direction to increase the gas pressure in the cylinder.

10. The electric driving tool according to claim 4 or 9, wherein the driver is rectangular when viewed from the driving direction, the driver guide is rectangular and surrounds the driver when viewed from the driving direction, and the adapter has a rectangular tip with three sides following the shape of the driver guide when viewed from the driving direction.

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