Driving tool

Abstract

To provide an idle striking prevention mechanism provided in a magazine of a driving tool and comprising a lock member that enters a movement path of a contact arm for activation and restricts ON operation thereof, where the idle striking prevention mechanism can be placed in a limited space, in contrast to a conventional rotatably provided lock member that requires a large space for retraction from the movement path and is hardly applicable to a gas spring type driving tool comprising a lift mechanism for a driver.SOLUTION: A lock member 28 is slidably provided in a pusher 22 that pushes driven members t in a feed direction T. An engaging portion 28b of the lock member 28 engages a locking portion of a contact arm to restrict ON operation of the contact arm. The lock member 28 is relatively retracted against a lock biasing member 29 when the engaging portion 28b is pressed against the contact arm. Thereby, the driven members t are pushed by a pusher piece 23b and reliably supplied to a driving passage.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present disclosure relates to a driving tool for driving a driving tool into a workpiece. [Background technology]

[0002] This type of driving tool is equipped with a magazine that stores a large number of driving tools. The stored driving tools are pushed by, for example, a spring-loaded pusher and sent to a driving passage. The magazine is equipped with an empty-strike prevention mechanism that restricts the driving operation when the number of remaining driving tools reaches a certain number in order to prevent so-called empty strikes. In the empty-strike prevention mechanism disclosed in Patent Documents 1 and 2, when the number of remaining tools reaches a certain number and the pusher reaches a specific position, a locking member enters the moving path of the contact arm. This restricts the ON operation of the contact arm and restricts the driving operation. In Patent Document 1, in order to avoid the engagement of the locking member with the contact arm that is not in the OFF position, the locking member is provided so as to be rotatable in a direction away from the contact arm. This avoids an unintended engagement state, so that the feed operation of the pusher with respect to the driving tools is not hindered. In Patent Document 2, the locking member is elastically deformed when an impact is applied to the contact arm, etc., to avoid the engagement state. The locking member in Patent Document 2 is incorporated separately from the pusher into a resin magazine with a half-split structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3558884 [Patent Document 2] Patent No. 6766727 Summary of the Invention [Problem to be solved by the invention]

[0004] However, for example, in a rechargeable driving tool in which the housing of the driving nose and the driver winding part are separate structures, there is a problem that it is difficult to secure sufficient space to apply the rotary locking member of Patent Document 1. Also, it is difficult to apply the locking member of Patent Document 2 to a magazine that uses aluminum drawing material, which places importance on durability. This disclosure provides a driving operation restriction structure that does not require the space required for a conventional rotary locking member and can be easily applied to a magazine of aluminum drawing material. [Means for solving the problem]

[0005] According to one aspect of the present disclosure, the driving tool has, for example, a driver that drives the driving tool into the workpiece, and a lift mechanism that returns the driver in a direction opposite to the driving direction of the driving tool. The driving tool has, for example, a contact arm that is pushed by the workpiece and moves relative to the tool body to allow the driver to perform a driving operation, and a magazine in which the driving tool is loaded. The driving tool has, for example, a pusher that is movably provided in the magazine and pushes the driving tool toward the driving passage of the driver, and a locking member that is provided on the pusher so as to be displaceable along a plane including the moving direction of the pusher. For example, the locking member enters the moving path of the contact arm to restrict the movement of the contact arm.

[0006] Therefore, the movement of the contact arm is restricted by the locking member entering the movement path of the contact arm. Restricting the movement of the contact arm restricts a driving operation such as, for example, blank driving. The locking member is provided on the pusher so as to be displaceable along a plane including the movement direction of the pusher, so that it does not require the space required for a conventional rotary locking member, and can be easily incorporated into a magazine for aluminum drawing material. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2]2 is a front view of the internal structure of the tool body and the lift mechanism as viewed from the direction of the arrow II in FIG. 1. This drawing shows a state in which the driver is located at the standby position. [Diagram 3] 1 is a left side view of the driving tool, in which the driving nose is shown in longitudinal section; [Figure 4] 1 is a front view of the internal structure of the tool body and the lift mechanism, showing the state in which the driver has reached the top dead center. [Diagram 5] 1 is a left side view of the driving tool, showing a state in which a driving tool is supplied to a driving passage. [Figure 6] This is a front view of the driving nose part. This figure shows the state where the driver has reached the lower end and the driving tool has been driven into the workpiece. [Figure 7] 1 is a left side view of the driving nose and the pusher, showing a state in which the locking member has not entered the path of travel of the contact arm. [Figure 8] 1 is a left side view of the driving nose and the pusher, showing the state in which the locking member has entered the path of movement of the contact arm. [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 7, and is a vertical cross-sectional view of the magazine. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] 12 is a cross-sectional view taken along line XII-XII in FIG. 11. [Figure 13] FIG. 11 is a left side view of a driving tool according to a second embodiment. [Figure 14] 11 is a left side view of the blank-strike prevention mechanism according to the second embodiment, showing the state in which the last driving tool has been supplied to the driving passage and the blank-strike prevention mechanism is about to be activated. [Figure 15] FIG. 11 is a left side view of a driving tool according to a third embodiment. [Figure 16] FIG. 11 is a left side view of a pusher and its surroundings according to a third embodiment. [Figure 17]11 is a perspective view of a pusher according to a third embodiment, in which the holder is shown in a longitudinal section along the feed direction. [Figure 18] 13 is a left side view showing an operating state of the locking member, in which a certain amount or more of the driving tool remains and the abutment portion of the locking member is separated from the abutment surface of the tool body. [Figure 19] 10 is a left side view showing an operating state of the locking member, in which a contact portion of the locking member contacts a contact surface of the tool body; [Figure 20] 13 is a left side view showing an operating state of the locking member, in which the remaining number of driving tools has reached a certain number and the engagement portion of the locking member has entered the moving path of the contact arm. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In one or more embodiments, for example, a driving tool pushed by a pusher abuts against a side surface of an end portion of a driver in a driving direction in a standby position, thereby preventing an inadvertent driving operation.

[0009] In one or more embodiments, for example, while the driver is moving from the standby position to the top dead center, the driving tool is pushed by the pusher and supplied to the driving passage of the driver. Thus, the driving tool is supplied to the driving passage just before the driver reaches the top dead center, and then the driver moves through the driving passage to perform the driving operation.

[0010] In one or more embodiments, for example, the locking member is displaceably mounted on the pusher in a direction parallel to the direction of movement of the pusher, thus providing a compact assembly of the locking member to the pusher.

[0011] In one or more embodiments, for example, the locking member is displaced to the retracted position by a tip surface of the locking member coming into contact with the contact arm, thereby preventing the locking member from entering the movement path of the contact arm and allowing the contact arm to move.

[0012] In one or more embodiments, for example, the pusher is provided with a guide portion that movably supports the locking member, and a retaining member that prevents the locking member from coming out of the guide portion. Thus, the locking member is supported in an undetachable manner with respect to the pusher.

[0013] In one or more embodiments, for example, the locking member is a plate-shaped member having a support portion located within the guide portion and an engagement portion located outside the guide portion and bent relative to the support portion to extend along a plane that crosses the guide portion. For example, the engagement portion is inserted into the movement path of the contact arm. Therefore, the locking member having a simple and inexpensive configuration can be assembled compactly without requiring a large space.

[0014] In one or more embodiments, for example, the locking member is provided on the pusher so as to be displaceable in a direction different from the direction of movement of the pusher, thus allowing the locking member to be compactly integrated into the pusher.

[0015] In one or more embodiments, for example, the locking member has an engagement portion at a lower portion in the driving direction and an abutment portion at an upper portion. For example, the abutment portion is restricted from moving upward by a regulating surface of the tool body. For example, the engagement portion enters the movement path of the contact arm. Therefore, the locking member is displaced such that the engagement portion enters the movement path of the contact arm by restricting the upward displacement of the abutment portion at the upper portion by the regulating surface of the tool body.

[0016] In one or more embodiments, for example, the abutment portion is a portion that protrudes toward the tool body, and thus the abutment portion abuts against a restricting surface of the tool body, reliably restricting upward displacement.

[0017] In one or more embodiments, for example, the locking member rotates along a plane that includes the direction of movement of the pusher, thus displacing the locking member in a region that is more compact with respect to the direction of movement of the pusher.

[0018] In one or more embodiments, for example, a pusher biasing member that biases the pusher toward the driving passage and a lock biasing member that biases the locking member in a direction protruding from the pusher are included. For example, the biasing force of the lock biasing member is smaller than that of the pusher biasing member. Therefore, even when the locking member is in face-to-face contact with the contact arm, the pusher exerts a pushing force in the supply direction against the driving tool reliably. This ensures that the driving tool is supplied.

[0019] In one or more embodiments, for example, the pusher has a holder in which the locking member is displaceably mounted, and a pusher piece that is rotatably mounted on the holder and abuts against the driving tool, so that the driving tool is fed toward the driving passage by the pusher moving with the pusher piece abutting against the driving tool.

[0020] In one or more embodiments, for example, the driving tool is fed in the driving direction as it approaches the driving passage, and therefore, for an angle-type driving tool in which the feed direction of the driving tool is inclined relative to the driving direction, a reliable prevention of blank driving is achieved by the locking member compactly integrated in the pusher.

[0021] In one or more embodiments, for example, the driver has a piston coupled thereto, and the driver performs a driving operation by gas pressure generated by the movement of the piston. Therefore, the above-described embodiments are applicable to a driving tool that performs a driving operation by using gas pressure as a thrust. EXAMPLES

[0022] In the embodiment of the present disclosure, as an example of the driving tool 1, a gas spring type driving tool that utilizes the gas pressure in the pressure accumulator above the cylinder as a thrust for driving the driving tool t is exemplified. For example, a rod-shaped nail is applied to the driving tool t. In the following description, the driving direction of the driving tool t is the downward direction, and the opposite driving direction is the upward direction. The user of the driving tool 1 is located on the right side (grip 3 side) of the driving tool 1 in FIG. 1. The side in front of the user is the rear direction (user side), and the opposite side to the front side is the forward direction. The left and right directions are based on the user holding the grip 3.

[0023] As shown in Figures 1 and 2, the driving tool 1 has a tool body 10. The tool body 10 has a configuration in which a cylinder 12 is accommodated in a main body housing 11 (see Figures 7 and 8), which is omitted in Figures 1 and 2. A piston 13 is accommodated in the cylinder 12 so as to be capable of vertical reciprocating motion. An upper portion 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 to move it downward.

[0024] A driving nose 15 is provided at the bottom of the tool body 10. The driving nose 15 includes a driver guide 16 and a contact arm 17. The inner periphery of the driver guide 16 serves as a driving passage 16a. The driving passage 16a is connected to the inner periphery of the cylinder 12. A long driver 2 is inserted into the driving passage 16a so as to be able to reciprocate up and down.

[0025] A contact arm 17 is supported around the driver guide 16 so as to be displaceable up and down. The contact arm 17 extends upward from around the lower end (injection port 18) of the driver guide 16. The contact arm 17 is biased downward toward the OFF position by a compression spring 17b. In the OFF position, the lower end of the contact arm 17 is located below the injection port 18. The contact arm 17 is pressed against the workpiece W and moved upward relatively (ON operation), thereby enabling the pull operation of the switch lever 4. A dial 17a for adjusting the driving depth is provided below the compression spring 17b. The OFF position of the contact arm 17 can be displaced up and down by rotating the dial 17a. This changes the stroke of the contact arm 17, and changes the position of the injection port 18 relative to the workpiece W during the ON operation. This changes the driving depth of the driving tool t into the workpiece W.

[0026] A magazine 20 is connected to the rear side of the driving nose portion 15. As shown in Figures 3 and 5, a large number of driving tools t are loaded into the magazine 20. One driving tool t is supplied from the magazine 20 into the driving passage 16a and is struck by the driver 2 moving downward.

[0027] A grip 3 that is held by the user is provided on the rear side of the tool body 10. A start-up switch lever 4 that is operated by the user by pulling it with his / her fingertips is provided on the underside of the front part of the grip 3. A switch main body 4a is mounted above the switch lever 4. When the switch lever 4 is pulled upward, the switch main body 4a is turned on. When the switch main body 4a is turned on, power is supplied to a lift mechanism 30, which will be described later.

[0028] A battery attachment section 5 is provided at the rear of the grip 3. A battery pack 6 is attached to the rear surface of the battery attachment section 5. The battery pack 6 can be attached to and detached from the battery attachment section 5 by sliding it up and down. The battery pack 6 can be used repeatedly by removing it from the battery attachment section 5 and charging it with a separately prepared charger. The battery pack 6 is versatile and can also be used as a power source for other power tools. The electric motor 31 of the lift mechanism 30 operates using the power of the battery pack 6 as a power source.

[0029] A flat-plate-shaped controller 5a is installed inside the battery attachment section 5. Operation is started by turning on the switch lever 4 and the contact arm 17. The operation of the electric motor 31 of the lift mechanism 30 is mainly controlled by the controller 5a.

[0030] A lower end damper 19 is disposed at the bottom of the cylinder 12 to absorb the impact at the lower end of the piston 13. A driver 2 is attached to the center of the lower surface of the piston 13. The driver 2 extends downward from the lower surface of the piston 13. The tip side (lower side) of the driver 2 in the driving direction enters the driving passage 16a through the inner periphery of the lower end damper 19. The driver 2 moves downward in the driving passage 16a by the gas pressure of the pressure accumulator chamber 14 acting on the upper surface of the piston 13. The tip (lower end) of the driver 2 moving downward in the driving passage 16a strikes one driving tool t supplied into the driving passage 16a. As shown in FIG. 6, the striking driving tool t is ejected from the ejection port 18 when the piston 13 reaches the lower end. The ejected driving tool t is driven into the workpiece W to be driven.

[0031] As shown in Figures 1, 3 and 5, a lift mechanism 30 is provided below the grip 3. The lift mechanism 30 has an electric motor 31 as a drive source. A lifter 33 is supported in front of the electric motor 31 via a reduction gear train 32. The driver 2 and piston 13 that have reached the lower end of their movement are returned to an upper standby position (opposite the driving direction of the driving tool t) by the lift mechanism 30. Details of the lifter 33 are shown in Figures 2, 4 and 6. The lifter 33 is supported by the output shaft 32a of the reduction gear train 32. The lifter 33 rotates in the direction indicated by the arrow R in Figures 2, 4 and 6 (counterclockwise in the figures). This returns the driver 2 upward (opposite the driving direction).

[0032] As shown in Figures 2, 4 and 6, a plurality of (nine in the figures) engaging portions 2a are provided on the right side of the driver 2. Each engaging portion 2a has a rack tooth shape that protrudes to the right. The engaging portions 2a are arranged at regular intervals in the longitudinal direction (up-down direction) of the driver 2. The lifters 33 of the lift mechanism 30 are engaged with the engaging portions 2a in sequence.

[0033] A lifter 33 is disposed on the right side of the driver 2. The lifter 33 has a plurality of (for example, nine) engagement pins 34 that are sequentially engaged with the engagement portion 2a of the driver 2. Each engagement pin 34 is made of a cylindrical shaft member. The plurality of engagement pins 34 are disposed at regular intervals along the outer periphery of the lifter 33. A large interval in the rotation direction (a relief area 33a where no engagement pins 34 exist) is provided between the first engagement pin 34 and the last engagement pin 34 in the rotation direction indicated by the arrow R. When this relief area 33a is directed toward the driver 2, the engagement state of the lifter 33 with respect to the engagement portion 2a of the driver 2 is released. FIG. 4 shows the state where the top dead center is reached immediately before the engagement state is released. FIG. 6 shows the driving state where the engagement state is released.

[0034] Activation of the electric motor 31 rotates the lifter 33 in the direction of the arrow R. After the driver 2 reaches the lower end as shown in Fig. 6, the rotation of the lifter 33 in the direction of the arrow R causes the engagement pin 34 to sequentially engage with the engagement portion 2a of the driver 2 from below, returning the driver 2 upward. The lift mechanism 30 returns the piston 13 upward, thereby increasing the gas pressure in the pressure accumulator chamber 14. When the driver 2 is returned to the standby position shown in Fig. 2, the electric motor 31 stops and the driving operation series ends.

[0035] When the switch lever 4 is pulled again, the lift mechanism 30 is restarted. As a result, the lifter 33 starts to rotate in the direction of the arrow R, and the driver 2 and piston 13 are lifted further upward from the standby position. Figure 4 shows the state in which the driver 2 and piston 13 are lifted to the upper movement end position.

[0036] After the driver 2 and piston 13 reach the upper end position, the lifter 33 continues to rotate in the direction of arrow R, disengaging the lifter 33 from the engagement portion 2a of the driver 2. This causes the relief area 33a of the lifter 33 to face the driver 2, and the driver 2 moves downward due to the gas pressure in the pressure accumulator chamber 14 acting on the piston 13. As the driver 2 moves downward in the driving passage 16a, the driving tool t is struck and driven into the workpiece W. Figure 6 shows the state in which the piston 13 has reached the lower end and the driving tool t has been driven into the workpiece W.

[0037] The magazine 20 is connected to the rear surface of the driver guide 16. The magazine 20 has a long magazine body 21 made of extruded aluminum. As shown in FIGS. 1 and 2, the magazine body 21 extends in a direction inclined diagonally leftward and upwardward from the rear surface of the driver guide 16. As a result, the magazine body 21 extends to a length that passes through the left side of the battery attachment portion 5. A large number of driving tools t temporarily fixed in a parallel state are loaded inside the magazine body 21. As shown by the outline arrow in the figure, the longitudinal direction of the magazine body 21, which is the direction toward the driving passage 16a, corresponds to the feed direction T of the driving tools t.

[0038] In this way, the feed direction T of the driving tool t relative to the driving passage 16a is inclined with respect to the extension direction of the driving passage 16a (the driving direction of the driver 2). Therefore, the driving tool t is fed so as to be displaced in the driving direction as it approaches the driving passage 16a. A driving tool 1 equipped with this angle-type magazine 20 is also called an angle nail driver. Normally, the angle-type magazine 20 is applied when the driving tool t stored therein is a nail having a head ta (e.g., a brad nail). Since the magazine 20 stores a large number of driving tools t connected to each other with the head ta shifted in the axial direction of the shaft tb, the feed direction T (the longitudinal direction of the magazine body 21) is inclined with respect to the driving direction (the nail axial direction).

[0039] As shown in Figures 1, 3 and 5, a loading opening 21f is opened at the rear of the magazine body 21. A large number of driving tools t temporarily fixed in a flat plate shape are loaded into the storage section 21a of the magazine body 21 through the loading opening 21f. As shown in Figure 9, the storage section 21a is a flat space that can store the driving tools t aligned vertically, and has a head storage section 21b at the top that holds the head ta of the driving tool t. A shaft storage section 21c extends downward from the head storage section 21b. The shaft tb of the driving tool t is stored in the shaft storage section 21c. Driving tools t with shafts tb of different lengths are stored in the storage section 21a with the position of the head ta in common.

[0040] A pusher 22 is held on the left side of the storage section 21a. The pusher 22 has a pusher claw 23 that pushes the driving tool t toward the driving passage 16a, and a holder 24 that supports the pusher claw 23. Guide edges 24a, 24b are provided on the top and bottom surfaces of the holder 24. A pair of upper and lower guide rails 21d, 21e are provided on the left side of the magazine body 21. The upper guide edge 24a is held by the upper guide rail 21d, and the lower guide edge 24b is held by the lower guide rail 21e. This allows the holder 24 to be supported slidably along the longitudinal direction of the magazine body 21 (the feed direction T of the driving tool t and the counter-feed direction).

[0041] 11 and 12, pusher claw 23 is supported by holder 24 via support shaft 25 so as to be rotatable left and right. Two pusher pieces 23b are provided at the tip of pusher claw 23 in the feed direction. As shown in Fig. 9, pusher claw 23 is biased by compression spring 26 in a direction (counterclockwise direction in Fig. 12) that causes pusher piece 23b to abut against bottom 21g of storage section 21a.

[0042] As shown in Figs. 10 and 11, a lever 23a is provided at the rear of the pusher claw 23. The user can rotate the pusher claw 23 by tilting the lever 23a with a fingertip. By tilting the lever 23a backward against the compression spring 26, the tip of the pusher claw 23 (pusher piece 23b) can be displaced in a direction in which it rises up (leftward) from the bottom 21g of the storage section 21a. This allows the driving tool t loaded from the loading port 21f of the magazine body 21 to pass to the right of the pusher claw 23 and move to the front side in the feed direction (the driving passage 16a side). When the tilting operation of the lever 23a is released, the pusher piece 23b is returned to a state in which it abuts against the bottom 21g of the storage section 21a by the urging force of the compression spring 26, and is engaged with the driving tool t at the rear end in the feed direction. A restricting claw 23c is provided between the two pusher pieces 23b to restrict the driving tool t from floating leftward.

[0043] A pusher biasing member 27 for biasing the pusher 22 toward the driving passage 16a is provided at the rear of the holder 24. A coiled leaf spring is used for the pusher biasing member 27. One end (the center of the winding) of the pusher biasing member 27 is connected to the holder 24. As shown in FIG. 7, the other end 27a of the pusher biasing member 27 is hooked and connected to the front end of the magazine body 21. The pusher 22 is slid in the counter-feed direction while the pusher biasing member 27 is stretched. As described above, by sliding the pusher 22 in the counter-feed direction against the pusher biasing member 27 while tilting the lever 23a backward against the compression spring 26, the driving tool t loaded from the loading port 21f can be moved forward in the feed direction by passing to the right of the pusher claw 23.

[0044] A finger hook 24h is provided on the left side surface of the holder 24. A user can easily slide the pusher 22 in the counter-feed direction by hooking a finger on the finger hook 24h. The finger hook 24h is disposed behind the lever 23a. When sliding the pusher 22 in the counter-feed direction, the user can hook the tip of a finger on both the lever 23a and the finger hook 24h. This makes it easy to slide the pusher 22 in the counter-feed direction with the pusher piece 23b of the pusher claw 23 raised above the bottom 21g of the storage section 21a.

[0045] When the rearward sliding operation of the pusher 22 is released, the pusher 22 is urged forward in the feed direction by the urging force of the pusher urging member 27. As a result, the entirety of the loaded driving tool t is pushed in the feed direction by the pusher claw 23 engaged with the driving tool t on the rear end side in the feed direction. The urging force of the pusher urging member 27 corresponds to the force with which the pusher claw 23 pushes the driving tool t.

[0046] The pusher 22 is provided with one locking member 28. The locking member 28 is manufactured by bending a plate-shaped material. The locking member 28 has a support portion 28a and an engagement portion 28b. The support portion 28a and the engagement portion 28b are perpendicular to each other in planar directions due to the bending process. As shown in FIG. 12, the support portion 28a is positioned within a guide portion 24c provided in the holder 24. This allows the locking member 28 to be supported by the holder 24 so as to be displaceable along a plane including the movement direction of the pusher 22 (the feed direction T of the driving tool t).

[0047] A recess 28c is provided in the support portion 28a. A retaining member 24d provided in the guide portion 24c enters the recess 28c. In this embodiment, a shaft member is used for the retaining member 24d. The retaining member 24d is supported in the plate thickness direction of the locking member 28. The retaining member 24d prevents the locking member 28 from coming out of the guide portion 24c. The locking member 28 is supported so as to be displaceable in the feed direction T and the counter-feed direction relative to the holder 24 within a range in which the retaining member 24d can be relatively displaced within the recess 28c.

[0048] An elastic ring 24e is attached to the retaining member 24d. This prevents the retaining member 24d from slipping out of the support hole 24f. The elastic ring 24e is positioned in the mounting hole 24g, so that it is positioned almost simultaneously with the support hole 24f. When assembling the locking member 28 to the holder 24, the retaining member 24d is inserted into the support hole 24f with the elastic ring 24e positioned in the mounting hole 24g, so that the elastic ring 24e is attached to the retaining member 24d. This improves the ease of assembling the retaining member 24d to the holder 24.

[0049] The engagement portion 28b of the locking member 28 is located outside the guide portion 24c. The engagement portion 28b extends along a plane that crosses the guide portion 24c. The tip surface 28d of the locking member 28 is formed on a tip surface that is approximately parallel to the driving direction of the driving tool t and the moving direction (up and down direction) of the contact arm 17. Therefore, the tip surface 28d of the locking member 28 is inclined with respect to the feed direction T of the driving tool t (the sliding direction of the locking member 28).

[0050] 12, a lock biasing member 29 is interposed between the lock member 28 and the holder 24. A compression spring is used for the lock biasing member 29. The lock biasing member 29 biases the lock member 28 in a direction in which it protrudes in the feed direction relative to the holder 24. For this reason, the lock member 28 is provided so as to be displaceable in the counter-feed direction against the lock biasing member 29.

[0051] The biasing force of the lock biasing member 29 is smaller than the biasing force of the pusher biasing member 27. Therefore, even if the lock member 28 hits the contact arm 17, for example, the pusher 22 moves in the feed direction by retracting the lock member 28 against the lock biasing member 29. As a result, the biasing forces of the pusher biasing member 27 and the lock member 28 are appropriately set so that the biasing force of the lock biasing member 29 does not hinder the force with which the pusher claw 23 pushes the driving tool t.

[0052] The locking member 28 provided on the pusher 22 has an anti-idle driving function that restricts the driving operation of the tool body 10 when the remaining number of driving tools t in the magazine 20 reaches a certain number. In the standby position of the driver 2 shown in Figs. 1 to 3, the head ta of the driving tool t pushed by the pusher 22 abuts against the side of the end (lower end) of the driver 2 in the driving direction. Therefore, in the standby state of the driver 2 as shown in Fig. 3, the driving tool t has not yet been supplied to the driving passage 16a. Also, at this stage, as shown in Figs. 1 and 7, the locking member 28 of the pusher 22 has not entered the moving path of the contact arm 17. Therefore, the contact arm 17 can be turned on, and the driving operation is permitted.

[0053] 4 and 5, when the contact arm 17 and the switch lever 4 are turned on, the lift mechanism 30 is activated and the driver 2 moves from the standby position toward the top dead center. As the driver 2 moves from the standby position to the top dead center, the head ta of the driving tool t is released from contact with the lower end of the driver 2. As a result, the driving tool t is pushed by the pusher 22 and supplied to the driving passage 16a.

[0054] When the driving tool t just before the blank driving prevention is activated (the last driving tool t) is supplied to the driving passage 16a (when the remaining amount in the magazine 20 reaches a preset fixed number (for example, zero or several)), the tip surface 28d of the locking member 28 abuts from the side against the contact arm 17 that has been moved upward by the on-operation. The abutted locking member 28 is moved back against the locking biasing member 29. As a result, the pusher 22 moves in the feed direction due to the biasing force of the pusher biasing member 27. As a result, the last driving tool t is pushed by the pusher claw 23 with sufficient force (the biasing force of the pusher biasing member 27) and is reliably supplied to the driving passage 16a.

[0055] After the driver 2 reaches the top dead center, the lifter 33 continues to rotate in the direction of the arrow R, disengaging the engagement pin 34 from the engagement portion 2a of the driver 2. This causes the piston 13 and the driver 2 to move downward by the gas pressure in the pressure accumulator chamber 14, and the last driving tool t is struck. When the driver 2 reaches the bottom end as shown in Figure 6, the driving tool t is driven into the workpiece W.

[0056] After the driver 2 reaches the lower end, the lifter 33 continues to rotate in the direction of the arrow R, so that the driver 2 is returned to the standby position. The contact arm 17 is returned to the OFF position by the reaction force during the driving operation, or by the user releasing the ON operation after the driving operation. The tip surface 28d of the locking member 28 that is abutted against the contact arm 17 from the side is formed in a plane parallel to the moving direction of the contact arm 17. Therefore, in the stage where the contact arm 17 is being returned to the OFF position, the locking member 28 is pushed by the contact arm 17 and smoothly retreats in the reverse feed direction. This prevents the locking member 28 from entering the moving path of the contact arm 17. In this way, in this embodiment, the locking member 28 is slid in the reverse feed direction to avoid engagement with the contact arm 17 during the return. This allows the locking member 28 to be retreated in a more limited space than in the conventional configuration where the locking member 28 is retreated by a rotational operation.

[0057] 8, when the contact arm 17 is returned to the OFF position, the locking member 28 is pushed out by the locking biasing member 29 and enters above the locking portion 17c of the contact arm 17. This restricts the ON operation (upward movement) of the contact arm 17. When the contact arm 17 is returned to the OFF position and the driver 2 is returned to the standby position, the head ta of the next driving tool t is in contact with the lower end of the driver 2 from the side, as in the above, and has not yet been supplied to the driving passage 16a.

[0058] As described above, when the remaining number of driving tools t in the magazine 20 reaches a certain number, the locking member 28 provided on the pusher 22 is above the locking portion 17c of the contact arm 17 and enters the moving path of the contact arm 17. This restricts the ON operation of the contact arm 17, thereby preventing idle driving.

[0059] According to the first embodiment described above, the locking member 28 enters the moving path of the contact arm 17, thereby restricting the ON operation of the contact arm 17 and preventing idling. The locking member 28 is provided on the pusher 22 so as to be displaceable along a plane including the moving direction of the pusher 22 (the feed direction T of the driving tool t).

[0060] Therefore, unlike the conventional rotary locking member, a large space is not required, and the locking member 28 can be assembled so as to be movable forward and backward within a limited space. In this respect, it becomes easy to incorporate the blank striking prevention mechanism (locking member 28) exemplified for the gas spring type driving tool 1 in which a large space cannot be secured because the lift mechanism 30 is disposed around the driving passage 16a.

[0061] In addition, a locking member 28 that restricts the movement of the contact arm 17 is provided on the pusher 22 to prevent blank strikes. This makes it easier to incorporate the locking member 28 compared to the conventional configuration in which the locking member 28 is incorporated into the magazine separately from the pusher. In this respect, it becomes easier to incorporate the blank strike prevention mechanism (locking member 28) exemplified for the magazine 20 whose magazine body 21 is made of extruded aluminum material.

[0062] According to the first embodiment, the driving tool t pushed by the pusher 22 comes into contact with the side surface of the end portion in the driving direction of the driver 2 in the standby position. Therefore, an inadvertent driving operation is prevented.

[0063] According to the first embodiment, while the driver 2 is moving from the standby position to the top dead center, the driving tool t is pushed by the pusher 22 and supplied to the driving passage 16a. Therefore, the driving tool t is supplied to the driving passage 16a just before the driver 2 reaches the top dead center, and then the driver 2 moves through the driving passage 16a to perform the driving operation.

[0064] According to the first embodiment, the locking member 28 is provided on the holder 24 of the pusher 22 so as to be displaceable in a direction parallel to the moving direction of the pusher 22. Therefore, the locking member 28 is incorporated in the pusher 22 in a compact manner.

[0065] According to the first embodiment, the locking member 28 is displaced to the retracted position when the tip surface 28d of the engaging portion 28b comes into face contact with the contact arm 17. This prevents the locking member 28 from entering the moving path of the contact arm 17, and allows the contact arm 17 to move toward the OFF position.

[0066] According to the first embodiment, the pusher 22 is provided with the guide portion 24c that movably supports the locking member 28, and the retaining member 24d that prevents the locking member 28 from coming off the guide portion 24c. This allows the locking member 28 to be supported by the pusher 22 so that it cannot be separated from the pusher 22.

[0067] According to the first embodiment, the locking member 28 is a plate-shaped member having a support portion 28a located within the guide portion 24c and an engagement portion 28b located outside the guide portion 24c, bent relative to the support portion 28a, and extending along a plane crossing the guide portion 24c. The engagement portion 28b is inserted into the moving path of the contact arm 17 to prevent blank strikes. Therefore, the locking member 28, which has a simple and inexpensive structure, can be compactly incorporated into the magazine 20 without requiring a large space.

[0068] According to the first embodiment, there is provided a pusher biasing member 27 that biases the pusher 22 toward the driving passage 16a, and a lock biasing member 29 that biases the lock member 28 in a direction protruding from the pusher 22. The biasing force of the lock biasing member 29 is smaller than the biasing force of the pusher biasing member 27. Therefore, even when the engaging portion 28b of the lock member 28 is in contact with the contact arm 17, the pusher 22 reliably exerts a pushing force in the supply direction against the driving tool t. This ensures that the driving tool t is supplied.

[0069] According to the first embodiment, the pusher 22 has a holder 24 in which the locking member 28 is displaceably mounted, and a pusher piece 23b rotatably mounted on the holder 24 and brought into contact with the driving tool t. Therefore, when the pusher 22 moves with the pusher piece 23b in contact with the driving tool t, the driving tool t is sent toward the driving passage 16a.

[0070] According to the first embodiment, the driver 2 has a piston 13 coupled thereto, and the driver 2 performs a driving operation by gas pressure generated by the movement of the piston 13. Therefore, the above-described embodiments are applicable to the gas spring type driving tool 1 that performs a driving operation using gas pressure as a thrust.

[0071] Various modifications can be made to the first embodiment. For example, the retaining member 24d that restricts the movement range of the locking member 28 may be configured to use a protrusion instead of a shaft member. By making the protrusion protrude into the recess 28c, it is possible to restrict the locking member 28 from coming off the guide portion 24c.

[0072] The retaining member 24d may be changed to a spring pin. By configuring the spring pin to be press-fitted into the support hole 24f, the elastic ring 24e and the mounting hole 24g can be omitted.

[0073] Although a compression spring has been exemplified as the lock biasing member 29 for biasing the lock member 28 toward the driving passage 16a, a tension spring, a leaf spring, urethane rubber, or the like may also be used as the lock biasing member.

[0074] Although the configuration in which the support portion 28a and the engagement portion 28b of the locking member 28 are bent so that their planar directions are perpendicular to each other has been exemplified, such bending may be omitted and the entire locking member may be of the same flat plate shape. A configuration using a round bar-shaped locking member may also be used.

[0075] Although a configuration has been exemplified in which support portion 28a is inserted into guide portion 24c to support locking member 28 slidably along the feed direction T of the driving tool t, the locking member may also be slidably supported using, for example, two slide bars.

[0076] Although the configuration in which the compression spring 26 biases the pusher piece 23b in the direction of entering the accommodation portion 21a has been exemplified, a configuration in which the pusher claw 23 is biased using a tension spring or a torsion spring instead of the compression spring 26 may also be used.

[0077] A coiled leaf spring has been exemplified as the pusher biasing member 27 that biases the pusher 22 in the feed direction T of the driving tool t, but instead of this, a compression spring or a tension spring may be used as the pusher biasing member.

[0078] 13 and 14 show a driving tool 40 according to a second embodiment. The driving tool 1 of the first embodiment is used, for example, for connecting construction pillar materials. For this reason, it has a large magazine 20 capable of storing a large number of relatively long driving tools. The driving tool 40 of the second embodiment is used, for example, for connecting flooring materials. For this reason, it has a compact magazine 41 capable of storing a large number of relatively short and thin driving tools. In the second embodiment, the configuration of the magazine 41, particularly the locking member, is different. For components and configurations that do not require change, the same reference numerals are used and explanations are omitted.

[0079] The driving tool 40 of the second embodiment is a gas spring type driving tool like the first embodiment, and includes a tool body 10 and a driving nose portion 15. A grip 3 extends rearward from the tool body 10. A battery attachment portion 5 is provided at the rear of the grip 3. A battery pack 6 is attached to the battery attachment portion 5. A switch lever 4 for starting the tool is provided at the base of the underside of the grip 3. Although not visible in the figure, a cylinder 12, a piston 13, and a pressure accumulator chamber 14 are housed within the main body housing 11 of the tool body 10. A driver 2 having a plurality of engagement portions 2a is coupled to the piston 13. The driver 2 moves up and down within the driving passage 16a of the driver guide 16.

[0080] A driver guide 16 is connected to the lower part of the tool body 10. A lift mechanism 30 is adjacent to the driver guide 16. A contact arm 17 is provided so as to be displaceable up and down relative to the driver guide 16. When the contact arm 17 and the switch lever 4 are turned on, the lift mechanism 30 is activated and a driving operation is performed.

[0081] The magazine 41 is coupled to the rear side of the driver guide 16. The magazine 41 extends rearward from the driver guide 16. The magazine 41 extends in a direction perpendicular to the driving direction. The magazine 41 includes a magazine body 42 that stores a large number of driving tools t, and a pusher 43.

[0082] As shown in Fig. 14, the pusher 43 includes a holder 44, a locking member 45, and a pusher piece 46. The locking member 45 is supported on the left side of the holder 44 (the front side of the page). The pusher piece 46 is provided on the right side of the holder 44 (the rear side of the page, the side of the driving tool t). The pusher piece 46 is biased by a torsion spring 47 in a direction in which it abuts against the bottom of the storage section of the magazine body 42. The pusher piece 46 pushes the driving tool t towards the driving passage.

[0083] As in the first embodiment, the pusher 43 is biased toward the driving passage by a coiled leaf spring (pusher biasing member). The biasing force of the pusher 43 pushes the driving tool t toward the driving passage.

[0084] The locking member 45 of the second embodiment has a flat plate shape. The locking member 45 is supported in a guide portion 44a that opens to the front surface of the holder 44. The locking member 45 is supported in a position in which its surface direction is parallel to a surface including the feed direction T of the driving tool t (the movement direction of the pusher 43), and is slidable along the surface including the feed direction T of the driving tool t. The movement of the locking member 45 in the direction of coming out of the guide portion 44a is restricted by two restricting portions 48, 49. The upper restricting portion 48 is located in a groove 45a that is long in the front-rear direction. The lower restricting portion 49 is in contact with the front side of an abutting portion 45b provided at the lower portion of the locking member 45.

[0085] A single compression spring 50 is interposed between the locking member 45 and the innermost portion of the guide portion 44a. The compression spring 50 biases the locking member 45 in a direction in which the locking member 45 comes out of the guide portion 44a (toward the driving passage). The locking member 45 is supported so as to be able to slide rearward against the biasing force of the compression spring 50. The compression spring 50 corresponds to a lock biasing member.

[0086] An engagement portion 45c is provided at the front of the locking member 45. When the remaining number of driving tools t in the magazine 41 reaches a preset number, and the last permissible driving tool t (the driving tool t immediately before the blank strike prevention is activated) is struck, the locking member 45 enters the moving path of the contact arm 17. Therefore, the locking portion 17c of the contact arm 17 engages with the engagement portion 45c of the locking member 45 from below, thereby restricting the ON operation of the contact arm 17. This prevents blank strikes when the remaining number of tools in the magazine 41 reaches a certain number.

[0087] As in the first embodiment, the biasing force of the compression spring 50 that biases the locking member 45 in the feed direction T is smaller than the biasing force of the leaf spring (pusher biasing member) that biases the pusher 43 in the feed direction T. For this reason, for example, if the locking member 45 abuts against the contact arm 17 from behind while the contact arm 17 is being returned from the ON position to the OFF position, the locking member 45 retreats against the compression spring 50, causing the pusher 43 to move in the feed direction T by the pusher biasing member. This ensures that the driving tool t is supplied to the driving passage in an appropriate position, and the contact arm 17 is smoothly returned to the OFF position.

[0088] According to the second embodiment, the flat locking member 45 enters the moving path of the contact arm 17, thereby restricting the ON operation of the contact arm 17 and preventing idling. The locking member 45 is provided on the pusher 43 so as to be slidable along a plane including the moving direction of the pusher 43 (the feed direction T of the driving tool t).

[0089] Therefore, as in the first embodiment, the locking member 45 can be assembled in a limited space so as to be movable forward and backward, without requiring a large space as in the conventional rotary locking member. In this respect, it becomes easy to incorporate the blank striking prevention mechanism (locking member 45) exemplified for the gas spring type driving tool 40 in which a large space cannot be secured due to the lift mechanism 30 being disposed around the driving nose portion 15, for example.

[0090] In addition, to prevent blank strikes, a lock member 45 that restricts movement of the contact arm 17 is provided on the pusher 43. This simplifies the configuration of the magazine 41 compared to the conventional configuration in which the pusher is incorporated into the magazine separately.

[0091] Further modifications can be made to the first and second embodiments described above. For example, the remaining amount at which blank strike prevention is performed can be changed by changing the position of the locking member 28, 45 relative to the holder 24, 44, or by changing the length of the locking member 28, 45 in the feed direction T. For example, the relative position of the locking member 28, 45 with respect to the holder 24, 44 can be changed so that the locking member 28, 45 enters the moving path of the contact arm 17 when the remaining amount in the magazine 20, 41 becomes zero or only a few, or the length of the locking member 28, 45 in the feed direction T can be changed.

[0092] A driving tool 60 according to a third embodiment is shown in Fig. 15. The driving tool 60 according to the third embodiment is a gas spring type driving tool like the first and second embodiments, and includes a tool body 10 and a driving nose portion 15. A cylinder 12 and a piston 13 are installed inside the tool body 10. A driving passage 16a is provided in the driving nose portion 15, through which the driver 2 is inserted so as to be able to reciprocate up and down. The same reference numerals as in the first and second embodiments are used for members and configurations that do not require modification, such as the grip 3, the battery attachment portion 5, or the lift mechanism 30, and their explanations are omitted.

[0093] The driving tool 60 according to the third embodiment is a so-called angle nail driver, and like the first embodiment, it has a magazine 70 in which the feed direction T of the driving tool t is inclined with respect to the driving direction. The magazine 70 has a locking member 80 different from that of the first embodiment.

[0094] As shown in Fig. 16, the driver guide 16 according to the third embodiment has a configuration in which a front guide portion 16b and a rear guide portion 16c are joined together in a mutually overlapping manner from front to rear. A driving passage 16a is formed between the front guide portion 16b and the rear guide portion 16c. A contact arm 17 is supported by the driver guide 16 so as to be displaceable up and down. The contact arm 17 is biased downward toward the OFF position by a compression spring (not shown in the figure). In the OFF position, the contact arm 17 protrudes downward from the lower portion of the driver guide 16 (the injection port 18). As shown in Fig. 15, a dial 17a for adjusting the driving depth is provided on the upper portion of the contact arm 17.

[0095] The magazine 70 has a magazine body 71 that stores the driving tool t and a pusher 72 that pushes the driving tool t in the feed direction T. The front end of the magazine body 71 is connected to the rear guide portion 16c of the driver guide 16. The inside of the magazine body 71 (storage portion 71a for the driving tool t) penetrates the rear guide portion 16c and communicates with the driving passage. The magazine body 71 extends rearward and obliquely upward from the driver guide 16. A loading port 71b for the driving tool t is provided at the rear of the magazine body 71.

[0096] 16 and 17 , the pusher 72 is supported by the magazine body 71 so as to be movable along the feeding direction T. The pusher 72 includes a holder 73, a pusher piece 74, and a locking member 80. The holder 73 is supported by the magazine body 71 so as to be movable in the feeding direction T. The pusher 72 is biased in the feeding direction T by a pusher biasing member 77 housed in the rear of the holder 73. A tip end of the pusher biasing member 77 is hooked onto the front part of the magazine body 71.

[0097] The pusher piece 74 is supported by the holder 73 via a support shaft 75 so as to be rotatable in a direction (left-right direction) that moves the front side of the pusher piece 74 toward and away from the bottom of the storage section 71a. A torsion spring 76 is attached to the support shaft 75. One end 76a of the torsion spring 76 is engaged with the upper surface of the pusher piece 74. The other end 76b of the torsion spring 76 is engaged with the holder 73. This biases the pusher piece 74 in a direction (rightward) that brings the front side into contact with the bottom of the storage section 71a. The front side of the pusher piece 74 comes into contact with the driving tool t, and the driving tool t is pushed in the feed direction T.

[0098] Guide portions 74a are provided on the upper and lower edges of the front side of the pusher piece 74. The upper and lower guide portions 74a enter upper and lower guide grooves provided in the magazine body 71. This guides the front portion of the pusher piece 74 to be movable in the feed direction T. When the pusher 72 is moved backward by manual operation, the upper and lower guide portions 74a reach the wide portions (not shown in the figure) of the guide grooves. This allows the front side of the pusher piece 74 to be displaced in a direction away from the bottom of the storage section 71a. The front side of the pusher piece 74 floats up from the bottom of the storage section 71a against the torsion spring 76, so that the driving tool t loaded from the loading opening 71b can be moved forward in the feed direction T relative to the pusher piece 74. After that, the manual operation is released, and the driving tool t is pushed in the feed direction T by the pusher piece 74.

[0099] An opening 73a that is long vertically is provided at the front of the holder 73. A flat locking member 80 is supported between left and right wall portions 73b that form the opening 73a. The locking member 80 is supported between the left and right wall portions 73b so as to be displaceable along a plane that includes the moving direction of the pusher 72 (the feed direction T of the driving tool t). The locking member 80 is supported so as to be movable in the moving direction of the pusher 72 and in a direction different from the moving direction of the pusher 72.

[0100] The locking member 80 has an engagement portion 80a and an abutment portion 80b on the front side in the feed direction T. The engagement portion 80a and the abutment portion 80b are provided at a fixed interval above and below each other. The lower engagement portion 80a has a generally mountain shape and protrudes forward. The abutment portion 80b has a generally semicircular shape and protrudes forward.

[0101] A lower arm portion 80c and an upper guide portion 80d are provided on the rear side of the locking member 80. The arm portion 80c protrudes generally downward. The guide portion 80d is a slot that extends generally rearward. A rear wall portion 73c, which is a part of the holder 73, is provided on the rear side of the locking member 80. A locking biasing member 81 is interposed at the rear of the locking member 80, between the arm portion 80c and the guide portion 80d and the rear wall portion 73c of the holder 73. A compression spring is used for the locking biasing member 81. The locking member 80 is biased generally forward in the feed direction T by the locking biasing member 81.

[0102] Two engagement shafts 82, 83 are provided between the left and right wall portions 73b of the holder 73. An arm portion 80c of the locking member 80 abuts against the lower engagement shaft 82 from behind. The arm portion 80c is pressed against the engagement shaft 82 by the biasing force of a lock biasing member 81 and is constantly maintained in abutting state. The upper engagement shaft 83 enters a guide portion 80d of the locking member. Movement of the locking member 80 is permitted within a range in which the engagement shaft 83 can be relatively displaced within the guide portion 80d.

[0103] As shown in Fig. 16, a guide recess 16d is provided in the rear guide portion 16c of the driver guide 16 in front of the locking member 80. The guide recess 16d has a depth direction in the front-rear direction and extends vertically. A lock portion 17c integrally provided on the contact arm 17 is guided along the guide recess 16d so as to be vertically displaceable. When the contact arm 17 is operated upward to be turned on, the lock portion 17c is displaced upward within the guide recess 16d.

[0104] The bottom (front surface) of the guide recess 16d serves as an abutment surface 16e. A restriction surface 16f is provided on the upper portion of the abutment surface 16e. The restriction surface 16f corresponds to the upper surface of the guide recess 16d and extends at a substantially right angle to the abutment surface 16e.

[0105] 16 and 18 show a state in which the number of driving tools t remaining in the magazine 70 is equal to or greater than a certain number. Therefore, the pusher 72 is rearwardly separated from the driving passage. In this state, the locking member 80 is in an unlocked position in which it is pushed forward in the feed direction T by the locking biasing member 81. When the locking member 80 is in the unlocked position, the lower engagement shaft 82 abuts against the base side (upper side) of the arm portion 80c, and the upper engagement shaft 83 abuts against the rear portion of the guide portion 80d.

[0106] 19, when the number of driving tools t remaining in the magazine 70 becomes low, the pusher 72 advances in the feed direction T. When the number of driving tools t remaining that can be driven becomes, for example, one, the abutment portion 80b of the locking member 80 abuts against the abutment surface 16e of the guide recess 16d.

[0107] After the last of the possible number of driving tools t is driven, the driver 2 is returned to the upper standby position, and the pusher 72 advances a distance equivalent to one of the driving tools t. The pusher 72 advances in the feed direction T with the abutting portion 80b of the locking member 80 abutting against the abutting surface 16e of the guide recess 16d. As a result, as shown in FIG. 20, the abutting portion 80b is displaced upward and abuts against the restricting surface 16f of the guide recess 16d, and the locking member 80 displaces the upper side obliquely upward and rearward against the locking biasing member 81, and displaces the lower side obliquely upward and forward to the locked position. That is, the locking member 80 rotates as a whole in the clockwise direction as shown in the figure around the lower engagement shaft 82 due to the biasing force of the locking biasing member 81. As a result, the locking member 80 is displaced from the unlocked position shown in FIGS. 18 and 19 to the locked position shown in FIG. 20 with respect to the holder 73.

[0108] After the last driving tool t of the number that can be driven has been driven in this way, the pusher 72 advances in the feed direction T, and the locking member 80 is displaced to the locked position. When the locking member 80 is displaced to the locked position, the tip side of the arm portion 80c abuts against the lower engagement shaft 82, and the upper engagement shaft 83 abuts against the front end of the guide portion 80d. As a result, the abutment portion 80b is pressed against the restriction surface 16f by the biasing force of the lock biasing member 81, and the locking member 80 is held in the locked position.

[0109] Furthermore, when the locking member 80 is displaced to the locked position, the engaging portion 80a enters the guide recess 16d. This causes the engaging portion 80a of the locking member 80 to enter the moving path of the locking portion 17c of the contact arm 17. The engaging portion 80a enters above the locking portion 17c. This restricts the upward displacement of the locking portion 17c, and the ON operation of the contact arm 17 is restricted. The abutting portion 80b is pressed against the restricting surface 16f, and the locking member 80 is reliably held in the locked position, so that the engaging portion 80a reliably restricts the upward displacement of the locking portion 17c. This restricts the driving operation after the remaining number of driving tools t reaches a certain number (empty driving prevention mechanism).

[0110] According to the third embodiment, the engagement portion 80a of the locking member 80 enters the movement path of the contact arm 17, thereby restricting the ON operation of the contact arm 17 and preventing blank strikes. The locking member 80 is provided on the pusher 72 so as to be displaceable along a plane including the movement direction of the pusher 72 (the feed direction T of the driving tool t). Therefore, the third embodiment does not require a large space as with the conventional rotary locking member, and by providing the locking member 80 on the pusher 72, blank strike prevention is achieved with a more compact configuration than before.

[0111] According to the third embodiment, the locking member 80 is provided on the pusher 72 so as to be displaceable in a direction different from the moving direction of the pusher 72. Therefore, the locking member 80 is incorporated compactly into the pusher 72. According to the third embodiment, the locking member 80 can be displaced in the moving direction of the pusher 72 in a more compact area than in the first embodiment in which the locking member 28 advances and retreats along the moving direction of the pusher 72.

[0112] According to the third embodiment, the locking member 80 has an engaging portion 80a at the lower portion in the driving direction and an abutting portion 80b at the upper portion. Therefore, the upper abutting portion 80b is restricted from moving upward by the restricting surface 16f of the tool body 10, and thus the locking member 80 is displaced so that the engaging portion 80a enters the movement path of the contact arm 17.

[0113] According to the third embodiment, the contact portion 80b is a portion that protrudes toward the tool body 10. Therefore, the contact portion 80b comes into contact with the restriction surface 16f of the tool body 10, and the upward displacement is reliably restricted.

[0114] According to the third embodiment, the locking member 80 rotates along a plane that includes the moving direction of the pusher 72. Therefore, the locking member 80 is displaced in a more compact area with respect to the moving direction of the pusher 72.

[0115] According to the third embodiment, the driving tool t in the magazine 70 is fed in the driving direction as it approaches the driving passage 16a. Therefore, for the angle-type driving tool 60 in which the feed direction of the driving tool t is inclined with respect to the driving direction, the locking member 80 compactly incorporated in the pusher 72 reliably prevents blank driving.

[0116] The driving tool 1 of the first embodiment, the driving tool 40 of the second embodiment, and the driving tool 60 of the third embodiment are examples of driving tools in one aspect of the present disclosure. The driving tool t of the first, second, and third embodiments is an example of a driving tool in one aspect of the present disclosure. The workpiece W of the first, second, and third embodiments is an example of a workpiece in one aspect of the present disclosure. The driver 2 of the first, second, and third embodiments is an example of a driver in one aspect of the present disclosure.

[0117] The lift mechanism 30 of the first, second and third embodiments is an example of a lift mechanism according to an aspect of the present disclosure. The tool body 10 of the first, second and third embodiments is an example of a tool body according to an aspect of the present disclosure. The contact arm 17 of the first, second and third embodiments is an example of a contact arm according to an aspect of the present disclosure.

[0118] The magazine 20 of the first embodiment, the magazine 41 of the second embodiment, and the magazine 70 of the third embodiment are examples of magazines in one aspect of the present disclosure. The driving passage 16a of the first, second, and third embodiments are examples of driving passages in one aspect of the present disclosure. The pusher 22 of the first embodiment, the pusher 43 of the second embodiment, and the pusher 72 of the third embodiment are examples of pushers in one aspect of the present disclosure.

[0119] The locking member 28 of the first embodiment, the locking member 45 of the second embodiment, and the locking member 80 of the third embodiment are examples of the locking member in one aspect of the present disclosure. The upper part of the locking portion 17c of the first, second, and third embodiments is an example of the movement path of the contact arm in one aspect of the present disclosure. [Explanation of symbols]

[0120] W…Material to be driven t…Driving tool ta…head, tb…shaft T…Feed direction of the driving tool t 1...Driving tool (first embodiment) 2. Driver 2a…Engagement part 3. Grip 4…Switch lever 4a…Switch body 5…Battery mounting section 5a…Controller 6. Battery pack 10...Tool body 11...Main body housing 12...Cylinder 13…Piston 14...Accumulation chamber 15…Driven nose part 16. Driver's Guide 16a...Driving passage 16b...Front guide section, 16c...Rear guide section 16d: guide recess, 16e: abutment surface, 16f: regulation surface 17…Contact arm 17a...dial, 17b...compression spring, 17c...lock part 18...Ejection port 19...Lower end damper 20…Magazine 21…Magazine body 21a...accommodating section, 21b...head section, 21c...shaft section, 21d, 21e...guide rail 21f…loading port, 21g…bottom 22... Pusha 23...Pusher jaw 23a... lever, 23b... pusher piece, 23c... regulating claw 24…Holder 24a, 24b... guide edge portion, 24c... guide portion, 24d... retaining member, 24e... elastic ring 24f: Support hole, 24g: Mounting hole, 24h: Finger hook 25…Spindle 26…Compression spring 27... Pusher biasing member 27a...other end 28...Lock member 28a...support portion, 28b...engagement portion, 28c...recess, 28d...tip surface 29... Lock biasing member 30...Lift mechanism 31...Electric motor 32…Reduction gear train 32a…Output shaft 33…Lifter 33a…Relief area 34...Engagement pin 40...Driving tool (second embodiment) 41…Magazine 42…Magazine body 43... Pusha 44…Holder 44a…Guide section 45...Lock member 45a...slot hole, 45b...contact part, 45c...engaging part 46…Pusher piece 47...Torsion spring 48, 49…Regulation Department 50...Compression spring (lock biasing member) 60...Driving tool (third embodiment) 70…Magazine 71…Magazine body 71a: storage section, 71b: loading port 72... Pusha 73…Holder 73a...opening, 73b...wall, 73c...rear wall 74…Pusher piece 74a…Information department 75...Spindle 76...Torsion spring 76a...one end, 76b...other end 77... Pusher biasing member 80...Lock member 80a: engagement portion, 80b: abutment portion, 80c: arm portion, 80d: guide portion 81... Lock biasing member 82, 83...Engagement shaft

Claims

1. It is a driving tool, A driver for driving the driving tool into the material to be driven, A lift mechanism that returns the driver in the opposite direction to the driving direction of the driving tool, A contact arm that moves relative to the tool body when pressed by the material to be driven, allowing the driver to drive in, A magazine into which the aforementioned driving tool is loaded, A pusher is provided movably in the magazine to push the driving tool toward the driving passage of the driver, The pusher has a locking member provided so as to be displaceable along a plane including the direction of movement of the pusher, A driving tool in which the locking member enters the movement path of the contact arm and restricts the movement of the contact arm.

2. The driving tool according to claim 1, The driving tool, pressed by the pusher, is a driving tool that abuts against the side of the end of the driver in the driving direction in the standby position.

3. The driving tool according to claim 2, A driving tool supplied to the driving passage of the driver by being pushed by the pusher while the driver moves from the standby position to the top dead center.

4. A driving tool according to any one of claims 1 to 3, The locking member is a driving tool provided on the pusher so as to be displaceable in a direction parallel to the direction of movement of the pusher.

5. A driving tool according to any one of claims 1 to 3, The locking member is a driving tool whose tip surface makes surface contact with the contact arm and is displaced to a retracted position.

6. A driving tool according to any one of claims 1 to 3, The pusher is provided with a guide portion that movably supports the locking member and a retaining member that prevents the locking member from coming out of the guide portion.

7. The driving tool according to claim 6, The locking member is a plate-shaped member having a support portion located within the guide portion and an engaging portion located outside the guide portion, which is bent relative to the support portion and extends along a surface that crosses the guide portion, and the engaging portion enters the movement path of the contact arm as a driving tool.

8. A driving tool according to any one of claims 1 to 3, The locking member is a driving tool provided on the pusher so as to be displaceable in a direction different from the direction of movement of the pusher.

9. The driving tool according to claim 8, The locking member has an engaging portion at the lower part in the direction of driving, and a contact portion at the upper part, A driving tool in which the contact portion is restricted from upward displacement by the restricting surface of the tool body, and the engaging portion enters the movement path of the contact arm.

10. The driving tool according to claim 9, The aforementioned contact portion is a part of the driving tool that protrudes toward the tool body.

11. The driving tool according to claim 8, The locking member is a driving tool that rotates along a plane that includes the direction of movement of the pusher.

12. A driving tool according to any one of claims 1 to 3, A pusher biasing member that biases the pusher toward the driving passage, The locking member has a locking biasing member that biases the locking member in a direction that causes it to protrude from the pusher, The biasing force of the locking biasing member is less than that of the pusher biasing member in the driving tool.

13. A driving tool according to any one of claims 1 to 3, The pusher is a driving tool having a holder on which the locking member is displaceable, and a pusher piece that is rotatably mounted on the holder and in contact with the driving tool.

14. A driving tool according to any one of claims 1 to 3, The aforementioned driving tool is a driving tool that is advanced toward the driving direction as it approaches the driving passage.

15. A driving tool according to any one of claims 1 to 3, A driving tool having a piston to which the driver is coupled, wherein the driver performs a driving action due to the gas pressure generated by the movement of the piston.

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