Power tool

Abstract

To provide a power tool capable of reliably suppressing hanging down of a connection screw within a supply passage by solving such a problem that adsorption force of a magnet is unsatisfactory with respect to the hanging down to the lower side although the conventional lateral-side arrangement and position retention technique of a magnet is well-known in a screw driving machine provided with a magazine which stores the connection screw.SOLUTION: A downstream wall part 22a and an upstream wall part 23a are provided on a supply passage 24 which guides a connection screw 5 to an injection passage 20a so as to extend to the upper side of the connection screw 5. A second magnet 26 is arranged on the downstream wall part 22a. A first magnet 27 is arranged on the upstream wall part 23a. The magnet 27 and the second magnet 26 are arranged within a range of a head part 2b of a screw 2. The hanging down of the connection screw 5 to the lower side is suppressed by adsorption of the connection screw by the use of the first magnet 27 and the second magnet 26.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to power tools such as a screwdriver used for work of tightening screws or bolts onto a board, and a nail gun used for work of driving nails or staples into wood. In the present disclosure, screws, bolts, nails, and staples are collectively referred to as "fasteners" particularly focusing on the function of fastening two members that are separate from each other. Screws and bolts are tightened by rotating around the screw axis or by striking while rotating. Nails and staples are driven by striking in the driving direction. The tightening operation of screws or the driving operation of nails and staples is collectively referred to as work.

Background Art

[0002] Patent Documents 1 and 2 disclose technologies related to nail guns. This nail gun includes a magazine that holds a connecting nail in which a large number of nails are connected in parallel. The connecting nail is pitch-fed to the driving passage side in conjunction with the driving operation, so that the nails are supplied one by one to the driving passage. One nail supplied to the driving passage is struck by a striking driver and driven into wood or the like. In the nail guns of Patent Documents 1 and 2, a magnet (permanent magnet) is disposed in the middle of the supply passage from the magazine to the driving passage. Nails are adsorbed by this magnet so that the feeding position (feeding posture) of the connecting nail is held.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the staple guns of Patent Documents 1 and 2, the magnet was disposed on the side surface of the feed path. For this reason, although the lifting from the side wall portion of the supply path of the connecting staples is suppressed and the position is held, in the driving posture (vertical posture) with the driving direction along the gravitational direction, the downward displacement due to the own weight of the connecting staples could not be sufficiently suppressed by the attracting force of the magnet. In the present disclosure, displacement of the fastener supplied to the working path for tightening or driving in the working direction is more surely suppressed.

Means for Solving the Problems

[0005] According to one aspect of the present disclosure, a power tool is a power tool that separates a plurality of screws or a plurality of nails connected via a flexible connecting member, for example, from the connecting member and tightens or drives them one by one into a work target material. The power tool includes a driver that tightens a screw or drives a nail, for example, and a driver guide that movably supports the driver and has an injection path that guides the screw or the nail in the working direction. The power tool has a supply path that supplies a screw or a nail to the injection path, for example. A magnet is disposed in the supply path so as to face the head, which is the rear end in the working direction of the screw or the nail, for example.

[0006] Therefore, the head of the screw or the nail (fastener) is attracted by the magnet in the counter-working direction, and the supply posture of the screw or the nail is held. When the tightening direction of the screw or the driving direction of the nail (the injection direction of the injection path) is the working direction, the screw or the nail is attracted by the magnet in the counter-working direction (counter-tightening direction or counter-driving direction) in the supply path. For this reason, when the power tool is held in the vertical posture where the working direction is the vertical direction (gravitational direction), for example, the downward displacement of the screw or the nail due to its own weight in the supply path is suppressed.

[0007] As a result, in a state where the power tool is held in the vertical posture, the sagging due to the own weight of the screw or the nail is suppressed, so that, for example, the loading operation of the connecting screw or the connecting nail into the supply path can be performed quickly and surely.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0009] In one or more embodiments, for example, when the posture of the driver is vertical, a magnet is disposed in the supply passage so as to adsorb the head of the screw or the head of the nail upward. Thereby, the displacement downward (working direction) due to the self-weight of the screw or the nail is efficiently suppressed by the adsorption force of the magnet.

[0010] In one or more embodiments, the power tool includes a magazine that houses, for example, a plurality of screws or a plurality of nails connected by a connecting member. The supply passage is formed, for example, by connecting an upper flow passage formed in the magazine and a lower flow passage formed in the driver guide. For example, a first magnet is disposed as a magnet in the upper flow passage. Therefore, the displacement of the screw or the nail in the working direction is suppressed by the first magnet disposed in the upper flow passage on the magazine side.

[0011] In one or more embodiments, the power tool includes a magazine that houses a plurality of screws or a plurality of nails connected, for example, by a connecting member. The supply passage is formed, for example, by connecting an upper flow passage formed in the magazine and a lower flow passage formed in the driver guide. For example, a second magnet is disposed as a magnet in the lower flow passage. The second magnet is disposed so as to face the head of the screw or the head of the nail. Therefore, in addition to the magnet (first magnet) disposed in the upper flow passage on the magazine side, the head of the screw or the head of the nail is also attracted in the reverse working direction by the second magnet in the lower flow passage, and the displacement of the screw or the nail in the working direction is more reliably suppressed.

[0012] In one or more embodiments, when the screw or the nail located at the head in the supply direction is located in the injection passage, the magnet is disposed such that the center position of the magnet is within the range of the head of at least one screw or the head of at least one nail located after the second in the supply direction in a state where the posture of the driver is vertical. Therefore, the attracting force of the magnet acts efficiently on the head of the screw or the head of the nail, and the downward displacement (hanging down of the connecting screw or the connecting nail) of the screw or the nail is efficiently suppressed.

[0013] In one or more embodiments, the connecting member is made of, for example, resin. Therefore, the displacement of a plurality of screws (connecting screws) or a plurality of nails (connecting nails) connected in parallel by the resin-made connecting member is suppressed. The attracting force of the magnet acts efficiently on the head of the screw or the head of the nail made of metal, and the displacement is suppressed.

[0014] In one or more embodiments, the power tool is a power tool that moves a driver in the screw axis direction using, for example, compressed air as a power source to strike a screw in the working direction, and rotates the driver around the screw axis to tighten the screw into a work target material. The power tool is, for example, a compressed air-driven screwdriver. Therefore, in a state where the screwdriver is held in a vertical posture, it can be quickly loaded into the supply passage while suppressing the hanging down due to the self-weight of the connecting screw by the attracting force of the magnet.

Example

[0015] FIG. 1 shows the power tool 1 of this embodiment. In this embodiment, as the power tool 1, an air compression-driven screw driver used for the operation of tightening a screw (bolt) 2 into a work object W such as a gypsum board or wood is exemplified. The power tool 1 includes a tool body portion 10 that houses a driver 11 that strikes a supplied single screw 2 in the screw axis direction and rotates it around the screw axis. One screw 2 is tightened into the work material W by the driver 11. The driver 11 is a striking driver and functions as a screw tightening bit. In the following description, as shown in FIG. 1, a case where the power tool 1 is held in a vertical posture and the tightening direction (working direction) of the screw 2 is downward is exemplified. Therefore, the upward direction on the side opposite to the tightening direction of the screw 2 corresponds to the reverse working direction.

[0016] A driver guide 20 that movably supports the driver 11 is provided at the lower part of the tool body portion 10. The driver guide 20 extends downward from the tool body portion 10. The inside of the driver guide 20 is an injection passage 20a that penetrates vertically. The driver 11 is guided to reciprocate vertically in the injection passage 20a. As shown in FIGS. 2 and 3, the driver guide 20 is opened and closed by a door 21. When the door 21 is opened, a part of the injection passage 20a is opened.

[0017] A lower flow passage 22 for guiding the connecting screw 5 is integrally provided on the side portion of the driver guide 20. The lower flow passage 22 communicates with the injection passage 20a. Although not shown, the lower flow passage 22 is provided with a feeding mechanism for moving the connecting screw 5 to the injection passage 20a side. The feeding mechanism operates in conjunction with the operation on the tool body portion 10 side, so that the connecting screw 5 is pitch-fed to the injection passage 20a side. The lower flow passage 22 is also opened and closed by the door 21.

[0018] A contact arm 20b is provided at the lower part of the driver guide 20 so as to be relatively displaceable vertically. By pushing down the tool body 10 in a state where the contact arm 20b is in contact with the workpiece W, the contact arm 20b is displaced upward relative to the driver guide 20 and turned on. By performing both the on-operation of the contact arm 20b and the pulling operation of a switch lever 14 described later, driving and tightening operations are performed.

[0019] A grip portion 12 for the user to hold is provided on the side portion of the tool body 10. Regarding the left-right direction of the members and configurations, the user holding the grip portion 12 is taken as a reference. The grip portion 12 extends laterally from the tool body 10. A hose connection portion 13 for connecting an air hose for supplying compressed air is provided at the tip of the grip portion 12. Compressed air is accumulated inside the grip portion 12. The accumulated compressed air is supplied to the tool body 10. A trigger-type switch lever 14 that the user operates by fingertip is provided below the base side of the grip portion 12. When the contact arm 20b is moved upward and the switch lever 14 is pulled, compressed air is supplied to the tool body 10 and driving and tightening operations are performed.

[0020] A cylindrical magazine 25 is provided straddling between the driver guide 20 and the grip portion 12. The magazine 25 has a semi-cylindrical housing main body portion 25a and a semi-cylindrical main body lid portion 25b that opens and closes the housing main body portion 25a. The main body lid portion 25b is pivotally coupled to the housing main body portion 25a via a hinge portion 25c so as to be openable and closable.

[0021] The magazine 25 is loaded with the connecting screws 5 wound in a coil shape. As shown in FIG. 8, the connecting screw 5 has a configuration in which a large number of screws 2 are held in parallel on a long connecting member 3 made of resin and having flexibility. For example, 100 screws 2 are held on one connecting member 3. The connecting member 3 integrally has holding pieces 3a for holding a large number of screws 2. The holding pieces 3a are arranged in the longitudinal direction at regular intervals in multiple sets, with two holding pieces 3a facing each other vertically in a set for holding one screw 2.

[0022] As shown in FIGS. 7 and 8, the upper and lower portions of the body 2a of the screw 2 are held by two holding pieces 3a facing each other vertically. The screw 2 has a head 2b at the rear end in the working direction of the body 2a. The head 2b of the screw 2 protrudes upward from the upper holding piece 3a. With the connecting screw 3 holding a large number of screws 2, it is sequentially sent toward the injection passage 20a, and the screws 2 are supplied one by one into the injection passage 20a. By bringing the tip of the driver 11 into contact with the head 2b of the supplied screw 2 and pushing it downward, one screw 2 is detached from the connecting member 3. The detached screw 2 is rotated while being struck downward by the driver 11 and tightened into the work target material W.

[0023] An upper flow passage 23 through which the accommodated connecting screw 5 is drawn out is integrally provided in the accommodation main body portion 25a of the magazine 25. As shown in FIGS. 2 and 3, the upper flow passage 23 is connected to the lower flow passage 22. The connecting screw 5 drawn out from the magazine 25 is guided by the upper flow passage 23 and the lower flow passage 22 and supplied to the injection passage 20a. Therefore, a continuous supply passage 24 for guiding the connecting screw 5 to the injection passage 20a is constituted by the lower flow passage 22 and the upper flow passage 23. The upper flow passage 23 is opened and closed by a passage lid portion 25d integrally provided on the main body lid portion 25b.

[0024] As shown in FIGS. 2 to 5, a check claw 21a is provided on the door 21 that opens and closes the lower flow passage 22. As shown in FIGS. 4, 5, and 8, a large number of engagement holes 3b are provided at regular intervals on the body of the connecting member 3. When the door 21 is closed, the check claw 21a is engaged with the engagement hole 3b. The check claw 21a restricts the movement of the connecting screw 5 in the reverse feed direction.

[0025] Above the lower flow path 22, a downstream wall portion 22a is integrally provided. Above the upper flow path 23, an upstream wall portion 23a is integrally provided. The downstream wall portion 22a and the upstream wall portion 23a are provided continuously along the supply direction. As shown in FIGS. 4 to 6, the downstream wall portion 22a and the upstream wall portion 23a are provided in a state of protruding above the connecting screw 5. The downstream wall portion 22a and the upstream wall portion 23a regulate the upward displacement of the connecting screw 5. In the supply passage 24, each screw 2 of the connecting screw 5 is guided with the head 2b aligned at a fixed position with respect to the downstream wall portion 22a and the upstream wall portion 23a.

[0026] One magnet 26 is arranged on the downstream wall portion 22a. One magnet 27 is also arranged on the upstream wall portion 23a. Hereinafter, the upstream magnet 27 is referred to as the first magnet 27, and the downstream magnet 26 is also referred to as the second magnet 26. The first magnet 27 and the second magnet 26 are each provided with a permanent magnet of the same size having a cylindrical shape. The upstream first magnet 27 is inserted into a holding hole 23b provided in the upstream wall portion 23a and fixed by adhesion. The downstream second magnet 26 is inserted into a holding hole 22b provided in the downstream wall portion 22a and fixed by adhesion.

[0027] As shown in FIGS. 6 and 7, the first magnet 27 and the second magnet 26 are each located substantially directly above the head 2b of the screw 2 located in the supply passage 24 (within a range overlapping the head 2b in the supply direction). By the adsorption of the head 2b of the screw 2 by the first magnet 27 and the second magnet 26, the downward displacement (hanging down) of the connecting screw 5 is suppressed.

[0028] FIG. 6 shows a state in which the power tool 1 is held in a vertical posture (a posture in which the driver guide 20 is positioned in the vertical direction and the working direction is downward). In this vertical posture, the self-weight of the connecting screw 5 acts in the hanging-down direction (gravity direction). Further, in the supply passage 24, there is no wall portion or the like for regulating the displacement of the connecting screw 5 in the hanging-down direction because it is necessary to guide a longer screw 2.

[0029] Therefore, when the first magnet 27 and the second magnet 26 do not apply an upward (anti-gravity direction) attractive force to the head 2b of the screw 2, the connecting screw 5 is likely to hang down in the supply passage 24 as shown by the two-dot chain line in FIG. 6. According to the present embodiment, the hanging down of the connecting screw 5 in the supply passage 24 is suppressed by the head 2b of the screw 2 being attracted or sucked upward by the first magnet 27 and the second magnet 26.

[0030] The attractive forces of the first magnet 27 and the second magnet 26 on the connecting screw 5 are appropriately set so as not to inhibit the reliable and smooth feeding operation of the connecting screw 5 by the feeding mechanism.

[0031] The positions of the first magnet 27 and the second magnet 26 in the supply direction are also appropriately set. In the present embodiment, with the leading screw 2 positioned in the injection passage 20a, the center position of the second magnet 26 is located substantially directly above the head 2b of the third screw 2 in the supply direction, and the center position of the first magnet 27 is located substantially directly above the head 2b of the fifth screw 2 in the supply direction. Thus, the second magnet 26 and the first magnet 27 are arranged.

[0032] According to the embodiments illustrated above, when the posture of the driver 11 is made vertical along the gravity direction (vertical posture), the first magnet 27 and the second magnet 26 are arranged in the supply passage 24 so as to adsorb the head 2b of the screw 2 upward. Thereby, the displacement (hanging down) downward (working direction) due to the self-weight of the connecting screw 5 is suppressed. By suppressing the hanging down of the connecting screw 5 due to its self-weight, the downward protrusion (pinching by the passage lid portion 25d) of the connecting screw 5 from the supply passage 24 when the passage lid portion 25d is closed is avoided. Thereby, the loading operation of the connecting screw 5 into the supply passage 24 is performed quickly and reliably.

[0033] In particular, in the embodiment, the first magnet 27 and the second magnet 26 are arranged so as to be positioned substantially directly above the head 2b of the screw 2 located after the second in the supply direction. Thereby, the attracting force of the first magnet 27 and the second magnet 26 acts efficiently on the head 2b of the screw 2, and the sagging of the connecting screw 5 is efficiently suppressed.

[0034] In this embodiment, the end faces of the first magnet 27 and the second magnet 26 having a cylindrical shape are arranged facing the flat head 2b. For this reason, the head 2b of the screw 2 is adsorbed in a surface-contact state with respect to the end faces of the first magnet 27 and the second magnet 26. Thereby, the attracting force of the first magnet 27 and the second magnet 26 acts efficiently, and the downward sagging due to the own weight of the connecting screw 5 is reliably suppressed. In this regard, the conventional configuration in which a magnet is arranged on the side portion of the supply passage is intended to suppress the floating of the connecting screw or the connecting nail from the supply passage, and is not intended to suppress the sagging due to the own weight. In the conventional configuration, the attracting force of the magnet acts on the body portion of the screw from the side, and rather, the sagging state is maintained. Therefore, the conventional configuration cannot sufficiently suppress the sagging.

[0035] Various modifications can be made to the illustrated embodiment. For example, although the configuration using two magnets is illustrated, a configuration in which three or more magnets are arranged in the supply direction may be used. A configuration in which one magnet is arranged facing the head 2b of one screw 2 in the supply direction may also be used. The sagging of the connecting screw is suppressed by one or three or more magnets.

[0036] Although the configuration in which the first magnet 27 and the second magnet 26 are held in the holding holes 23b and 22b by adhesion is illustrated, for example, the holding holes may be stepped holes and fixed by sandwiching with a separate fixing plate.

[0037] Not limited to the cylindrical magnet, for example, a strip-shaped magnet may be arranged along the lower surface of the upstream wall portion 23a and / or the downstream wall portion 22a. The downstream wall portion 22a and the upstream wall portion 23a may be formed of magnets.

[0038] In the embodiment, a screwdriver that rotates in the tightening direction while hitting a screw was exemplified, but the magnet exemplified can also be applied to a screw tightening machine (screw driver) that rotates and tightens a screw (screw) to suppress the sagging of the connecting screw in the supply passage.

[0039] Although a screw tightening machine was exemplified as the power tool 1, the same can be applied to a nail gun that drives a nail as another example of a fastener. The magnet exemplified for the nail supply passage in the nail gun can suppress the sagging of the connecting nails.

[0040] Although the magazine 25 that houses the connecting screw 5 in a coiled state was exemplified, the same can be applied to a screw tightening machine having a holding portion that holds the connecting screw in a stretched state.

[0041] The power tool 1 of the embodiment is an example of a power tool in one aspect of the present disclosure. The connecting member 3 of the embodiment is an example of a connecting member in one aspect of the present disclosure. The screw 2 of the embodiment is an example of a screw in one aspect of the present disclosure. The work target material W of the embodiment is an example of a work target material in one aspect of the present disclosure.

[0042] The driver 11 of the embodiment is an example of a driver in one aspect of the present disclosure. The injection passage 20a of the embodiment is an example of an injection passage in one aspect of the present disclosure. The driver guide 20 of the embodiment is an example of a driver guide in one aspect of the present disclosure. The supply passage 24 of the embodiment is an example of a supply passage in one aspect of the present disclosure. The first magnet 27 and the second magnet 26 of the embodiment are examples of magnets in one aspect of the present disclosure.

Explanation of reference numerals

[0043] W... Workpiece 1... Power tool (screw driver) 2... Screw 2a... Barrel part, 2b... Head part 3... Connecting member 3a... Holding piece, 3b... Engaging hole 5... Connecting screw 10... Tool body part 11... Driver (screw tightening bit) 12... Grip part 13... Hose connection part 14... Switch lever 20... Driver guide 20a... Injection passage, 20b... Contact arm 21... Door 21a... Claw part (feeding mechanism) 22... Downstream passage 22a... Downstream wall part, 22b... Holding hole 23... Upstream passage 23a... Upstream wall part, 23b... Holding hole 24... Supply passage 25... Magazine 25a... Accommodation body part, 25b... Body cover part, 25c... Hinge part, 25d... Passage cover part 26... Second magnet 27... First magnet

Claims

1. A power tool for removing a plurality of screws or a plurality of nails connected via a flexible connecting member from the connecting member and tightening or driving them one by one into a work target material, comprising: a driver for tightening the screw or driving the nail; a driver guide that movably supports the driver and has an injection passage for guiding the screw or the nail in a working direction; a supply passage for supplying the screw or the nail to the injection passage; a wall portion provided to project opposite to the head of the screw or the nail in the supply passage; a magnet disposed on the wall portion so as to face the head which is the rear end of the screw or the nail in the working direction. A power tool having the same.

2. The power tool according to claim 1, further comprising: a magazine for accommodating the plurality of screws or the plurality of nails connected by the connecting member; the supply passage is formed by connecting an upper flow passage formed in the magazine and a lower flow passage formed in the driver guide; A power tool in which a first magnet is disposed as the magnet in the upper flow passage.

3. The power tool according to claim 1 or 2, further comprising: a magazine for accommodating the plurality of screws or the plurality of nails connected by the connecting member; the supply passage is formed by connecting an upper flow passage formed in the magazine and a lower flow passage formed in the driver guide; A power tool in which a second magnet is disposed as the magnet in the lower flow passage.

4. The power tool according to any one of claims 1 to 3, wherein: the magnet is disposed in the supply passage so as to adsorb the head of the screw or the head of the nail upward when the posture of the driver is vertical. A power tool.

5. The power tool according to any one of claims 1 to 4, wherein: when the screw or the nail located at the head in the supply direction is located in the injection passage, the center position of the magnet is within the range of the head of at least one of the screws located after the second in the supply direction or the head of at least one of the nails so that the magnet is disposed so as to be located. A power tool.

6. The power tool according to any one of claims 1 to 5, wherein: the connecting member is made of resin. A power tool.

7. The power tool according to any one of claims 1 to 6, wherein: A power tool that uses compressed air as a power source to move the driver in the screw axis direction to strike the screw in the working direction, and rotates the driver around the screw axis to tighten the screw into the work piece.

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