JP2008030166A - Hand-held type driving tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a function of a safety device without impairing a discharge function of a connection body in a driving tool using a connection fastener of a type of preventing the connection body from being torn. <P>SOLUTION: A head 3 is provided with a fixed type base body 20, a movable type workpiece contact element 30, and a lock-out probe 31. In the base body 20, a discharge passage in which the connection body A passes after a fastener n is driven out is opened. A front part of the workpiece contact element 30 is surrounded by the lock-out probe 31. When the workpiece contact element 30 is completely retreated, an intermediate interlocking member 27 incorporated into the base body 20 is retreated to unlock the safety device. The workpiece contact element 30 cannot be grasped by a person in a retreated state up to an unlocking position, and the intermediate interlocking member 27 cannot be accessed from the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hand-held driving tool such as a nailing machine, a hammering machine, or a pinning machine.

  A hand-operated driving tool uses a connecting fastener that consists of a large number of head-shaped bar fasteners arranged in parallel and held in a connecting body. The connecting fastener is loaded into a magazine and intermittently fed out. Continuous driving is performed by supplying fasteners one by one to the front of the driving rod. There are two types of connecting bodies, one type in which one unit is cut off from the subsequent portion by the punching out of the fastener, and the other is a type in which the fastener is ejected from the head portion without being cut out. As an example of the latter, there is a resin tape shown in FIG.

  That is, the connecting body A shown in FIG. 10 is a kind of carrier made of sheet material, and a plurality of pairs of holding pieces A2 for holding fasteners (nails in this example) n are provided on both longitudinal edges of the belt-like back plate A1. In general, it has a U-shape (channel shape). The holding pieces A2 adjacent in the longitudinal direction are divided by a slit A3, and the tip of the holding piece A2 is cut into a chamfered shape. For this reason, the connection body A is flexible as a whole, and the connection fastener (connection nail) can be wound in a coil shape. The fastener holding hole A4 formed in the holding piece A2 is open to the outside. This is for facilitating the protrusion of the fastener n and the rod and for facilitating the incorporation of the fastener n. Further, the back plate A1 is provided with feeding holes A5 at equal intervals.

  For example, when a wooden work is fastened with a nail, the head of the nail may be sunk into the work. However, in a type in which the connected body is not shredded and is ejected from the head, only the fastener is driven into the work. Therefore, it is suitable for the construction method in which the head of the nail is sunk into the work, and depending on the site, it may be disliked that the hooks of the connected fasteners are scattered, but the connected body is discharged from the head part without breaking. This type is suitable for the site where dirt is not required because wrinkles do not appear.

  On the other hand, driving tools include those using compressed air as a power source and those using gas combustion pressure. Among them, the pneumatic type is inferior in maneuverability because a hose is connected and a compressor is required, whereas the gas combustion type (internal combustion engine method) is inferior in maneuverability and the hose is fired. Since no operation is required, there is an advantage that workability is excellent.

  An example of a gas combustion type driving tool that can use a connection fastener wound in a coil shape is disclosed in Patent Document 1, and in this example, the connection fastener is also fed using the combustion pressure of gas. Moreover, in the example of this patent document 1, as for a connection body, 1 unit holding one fastener is torn off from a subsequent part.

  Regardless of the driving principle, the driving tool contains a main body with a built-in driving mechanism with a rod, a head portion provided on the front surface of the main body so as to guide the driving of the fastener by the rod, and a connecting fastener. A safety device that holds the rod so that the rod does not move forward even if the trigger is simply pulled, in order to prevent the blanking of the fastener being fired toward the person or into the air. Is attached.

  The safety device includes a work contact element (contact member) that retreats when pressed against the work, and the lock is released by the retreating movement of the work contact element. There are a variety of mechanisms that can be unlocked by the backward movement of the work contact element. For example, in the case of a gas-fired driving tool, the combustion chamber is closed by a sleeve, or a valve provided in the fuel gas passage is opened. ing.

There are two types of work contact elements that come back in contact with the work, one that is provided as a dedicated member for the safety device, and one that also serves as a guide for the forward movement of the fastener and rod. There are Patent Documents 2 and 3.
JP-A-8-252806 JP 2001-162560 A Japanese Patent Laid-Open No. 2005-1110

  By the way, since the pneumatic driving tool is inferior in mobility, the safety function is not strict, and even if it is a structure that allows a person to pick up the work contact element with a finger and move it back to the safety release position, there are no special restrictions .

  On the other hand, gas-fired driving tools can be carried anywhere and are therefore subject to the regulation of the sword law in Japan. If the structure does not allow people to easily unlock the safety device, it must be possessed without permission. It is a mechanism that can not. Therefore, in order for a user to easily purchase a gas-fired driving tool and enjoy its convenience, the structure must be made out of the restriction target so as to prevent idle driving (air launch).

  As a method for enhancing the safety function of the driving tool, it is only necessary to prevent a person from accessing the work contact element or a member moving in conjunction with the work contact element with a finger or an object (for example, a driver). It is mentioned that the member that controls the above is covered with a cover (shroud). However, in the case where the connecting body is discharged from the head portion without being broken, there is a problem that the connecting body cannot be discharged if a cover is provided.

  The present invention has been made in view of such a situation, and even if it is a driving tool using a connecting body of a type that is discharged from the head portion without being broken by driving, the discharging function of the connecting body is impaired. The task is to ensure a high safety function.

  The connecting body fastener used in the driving tool according to the present invention is attached to a long connecting body in a state where a large number of bar-shaped fasteners are arranged in parallel, and the fastener protrudes from the connecting body by the forward movement of the rod. Therefore, the connected body is discharged without being shredded (without becoming a small soot on site).

  The driving tool according to the present invention includes, as a basic structure, a main body in which a rod-shaped rod for driving the fastener is moved back and forth, a head portion provided on the front surface of the main body, and an attachment to the head portion. And a magazine that accommodates the connecting fastener, a trigger that operates the drive mechanism, and a safety device that holds the drive mechanism so that the drive mechanism does not operate even when the trigger is pulled. The head portion passes through the rod. A base body (which may be referred to as a nosepiece) having a launch passage and a discharge passage through which a connected body after fastener launching, and a part of the safety device, at least a front portion is formed in a cylindrical shape through which the rod passes And a workpiece contact element (a member that comes back in contact with the workpiece).

  Furthermore, in addition to the basic configuration, the base body is fixed to the main body, and an intermediate interlocking member that forms a part of the safety mechanism is provided in a portion of the base body that does not buffer the discharge passage. It is provided so as to slide freely in the longitudinal direction of the rod, and when the intermediate interlocking member is retracted by a predetermined dimension, the safety mechanism is unlocked and the drive mechanism is activated when the trigger is pulled.

  Further, the work contact element is attached to the base body in a state where the front part is exposed so as to move backward relative to the intermediate contact member by a predetermined dimension when pressed against the work, and The work contact element is a lockout probe (which may be called an auxiliary member) which can be moved back and forth in its entirety or most of the work contact element so that a person cannot pick it with his / her fingers when fully retracted. Covered. In addition, the “long” described as the structure of the connection body in claim 1 is synonymous with the elongated shape, and it is sufficient that a plurality of (for example, 10 or more) fasteners can be connected.

  In the present invention, in the state where the work contact element is fully retracted (in a state where the work contact element is retracted to the unlocking position correctly), all or most of the work contact element is provided on the base body or this so as not to be picked by a finger. Since it is covered with a cylindrical lockout probe, if the work contact element is to be retracted with a finger, the fingertip must be brought into contact with the end surface of the work contact element. For this reason, it is virtually impossible for a person to retract the work contact element with a finger. Further, since the intermediate interlocking member that constitutes the safety device together with the work contact element is built in the base body, it cannot be accessed from the outside (reversely operated).

  As described above, the driving tool according to the present invention cannot practically retract the work contact element, and the intermediate interlocking member cannot be retracted. Therefore, the fastener cannot be fired in the air, and the safety is high. Can be secured. On the other hand, combined with the fact that the cover (shroud) is not provided and the intermediate interlocking member is disposed so as not to interfere with the discharge passage of the connection body, the discharge function of the connection body after the fastener is driven out is impaired. It will never be.

  Therefore, according to the present invention, it is possible to maintain high safety in a driving tool that can use a connecting fastener of a type in which the connecting body is not broken by driving and does not leave wrinkles in the field. Therefore, it is easy to use a connecting fastener of a type that does not break the connection body for a gas-fired driving tool that is highly maneuverable and convenient but has strict regulations, and a gas-fired driving tool. (The present invention is also suitable for explosive-type driving tools that have strict regulations as well as gas-fired driving tools).

  Next, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 10). In the following description, when displaying directions such as front / rear / left / right / up / down, the terms front / rear / left / right / up / down are used with reference to an operator who performs a driving operation on a wall.

(1) Overall Overview This embodiment is applied to a nailing machine that uses the combustion pressure of gas as a drive source. 1 is an overall side view, and FIG. 2A is a partial longitudinal side view. As shown in both figures, a driving tool includes a main body 1 having a driving rod (blade) 2 incorporated therein, and a main body. 1 is provided with a head portion 3 provided at the front end of 1 and a magazine 4 disposed below the head portion 3.

  The main body 1 includes a hollow housing 5. The lower portion of the housing 5 is a narrow fuel can storage portion 5a for storing a gas cartridge, and a grip 6 that is inclined in a side view is provided on the lower surface of the gas storage portion 5a. A trigger 7 is provided at the base of the grip 6. A cover 8 is provided at the front of the housing 5, while a number of holes (not shown) for exhaust and intake are provided on the rear surface of the housing 5.

  An auxiliary frame 9 having a substantially L-shaped side view having an inclined portion and a lower horizontal portion is fixed to the front portion of the housing 5, and the lower end of the grip 6 is fixed to the lower horizontal portion 9 a of the auxiliary frame 9. Yes. The lower horizontal portion 9a of the auxiliary frame 9 is hollow and accommodates a battery for supplying power to the spark plug and the fan.

  The magazine 4 is in the form of a drum having a lid 10 that can be freely opened and closed, and a main body portion to which the lid 10 is attached (the rear side of the lid 10 is not shown in FIG. 1) is a feed mechanism portion. 11 is fixed to the head portion 3 via the bracket 11, and the main body portion is also fixed to the inclined portion of the auxiliary frame 9 via the bracket 12. The lid 10 opens to the front side of the paper surface in FIG. 1 with a hinge 13 provided at the lower end thereof as a center. The connecting nail is stored in the magazine 4 in a coiled state (coiled nail state), and is fed out from the start end to the head unit 3 via the feed mechanism unit 11. After the nail n is driven out, the connecting body A is discharged upward from the upper surface of the head portion 3.

  In this embodiment, as in Patent Document 1, the connection fastener is fed using the combustion pressure of the gas, but other forms of the magazine and the feed mechanism can also be adopted. For example, as disclosed in Japanese Patent Application Laid-Open No. 2005-288608, the present applicant sends a connecting fastener by a motor that rotates with a battery, or, as disclosed in Japanese Patent Application Laid-Open No. 2006-75960, straight It is also possible to use a spring-driven follower provided in a straight magazine in combination with a magazine and a drum magazine.

  As shown in FIG. 2A, a cylinder 15 constituting a drive mechanism is disposed inside the housing 5, and a piston 16 including the rod 2 is slidably fitted into the cylinder 15. A cushioning material (rubber) 17 is disposed at the front end of the cylinder bore.

  The cylinder 15 has a large opening toward the combustion chamber 18 behind the cylinder 15. A cylindrical sleeve 19 also serving as a safety device is slidably disposed outside the cylinder 15. When the sleeve 19 is retracted and the combustion chamber 10 is closed, the combustion chamber 10 is filled with fuel gas, When the trigger 7 is pulled, the spark plug sparks to ignite the gas, and the piston 9 and the rod 2 move forward. When the sleeve 19 is not fully retracted, the piston 16 does not advance even when the trigger 7 is pulled.

  The burned gas is discharged to the outside through exhaust holes provided in the cylinder 15 and the housing 5. Although not shown, the combustion chamber 10 is connected to a pipe line that supplies part of the combustion gas to the feed mechanism 11 when the piston 16 moves forward.

  A base body 20 constituting the head portion 3 is fastened to the front surface of the cylinder 15 with a screw 22 via a spacer 21. Further, a spring chamber 23 is opened forward on the front surface of the cylinder 15, and a conical spring 24 is disposed in the spring chamber 23. The front surface of the conical spring 24 is in contact with a disk portion 25a of an actuating member (cage) 25 that forms part of the safety device. As shown in FIG. 2B, the actuating member 25 includes four foot portions 25 b extending rearward along the outer surface of the cylinder 15, and the foot portions 25 b are connected to the sleeve 19. The cylinder 15 is formed with a forward notch groove for allowing the base portion of the foot portion 25b to recede.

  A ring body 26 that forms part of the head unit 3 and the safety device overlaps with the front surface of the operating member 25, and a rod-shaped intermediate interlocking member 27 that constitutes the head unit 3 and the safety device is formed on the ring body 26. It is attached by screwing. When the intermediate interlocking member 27 is retracted by a predetermined dimension, the sleeve 19 is also retracted together via the ring body 26 and the actuating member 25, thereby releasing the lock of the safety device. During normal operation (when locked), the actuating member 25 and the ring body 26 are pushed to the advanced position by the conical spring 24.

(2). Structure of Head Unit 3 Next, the head unit 3 will be described with reference to FIG. 3 and subsequent drawings in addition to FIG. 3 is a schematic perspective view of the head unit 3, FIG. 4 is a longitudinal side view of the head unit 3 in a locked state, and is a sectional view taken along line IV-IV in FIG. 5, FIG. 5 is a front view of the head unit 3, and FIG. 4 is a sectional view taken along line VII-VII in FIG. 4, FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 4, and FIG. 9 is a longitudinal side view in the driven state.

  For example, as can be understood from FIG. 3, the head portion 3 includes, as main members, the base body 20 described above, a lower block (share block) 29 arranged on the lower surface of the base body 20, and most of the base body 20. A work contact element 30 located in front and a lockout probe 31 covering the work contact element 30 are provided. The work contact element 30 may be called a main probe, and the lockout probe 31 may be called a sub probe.

  The base body 20 has a block shape, and a flange 20 a is formed at the rear end, and the flange 20 a is fixed to the main body 1. As shown in FIG. 2A, the ring body 26 is accommodated in a recess 32 formed on the rear surface of the base body 20. The base body 20 is formed with a launch passage 33 through which the rod 2 passes and a discharge passage 34 through which the connected body A after the nail n is launched is discharged upward.

  The connecting body A is generally U-shaped (channel-shaped), but the lateral hole 34a located forward of the discharge passage 34 as viewed from the work is more than 90 degrees in plan view with respect to the vertically long hole. It is inclined at a large angle. This is because the holding piece A2 located in the front of the coupling body A falls forward in plan view when the nail n is driven.

  The launch passage 33 of the base body 20 opens downward except for the rear end portion thereof, and the share block 29 overlaps the portion of the base body 20 where the launch passage 33 opens downward from below. The share block 29 is integrated with the base body 20 to guide the rod 2 and the connecting nail N. The share block 29 has a guide hole 35 through which the connecting nail N passes so as to open up and down. Is formed.

  The above-described feed mechanism unit 11 is fixed to the lower surface of the share block 29. The share block 29 may be fixed to the base body 20 with a bolt, or may be simply positioned with a pin (not shown) (since the share block 29 is fixed to the feed mechanism unit 11, Just positioning with 20 pins will not cause any problems in strength.)

  Although the rod-shaped intermediate interlocking member 27 described above is slidably fitted to the base body 20, as shown in FIG. 8, for example, the intermediate interlocking member 27 does not interfere with the discharge passage 34 from the operator. As seen, it is shifted to the right side of the discharge passage 33 by a slight angle θ (it may be shifted to the left side). The intermediate interlocking member 27 is formed in a pentagonal cross section (non-circular), and therefore, the screwing into the ring body 26 is not loosened. Of course, it may be made of a round bar.

  The work contact element 30 includes a large-diameter cylindrical portion 30a located on the front end side, a small-diameter portion 30b integrally connected to the rear thereof, and an upper rear end of the small-diameter portion 30b. And a thin rearwardly projecting portion 30c provided integrally therewith. The rearward projecting portion 30 c is fitted in a hole formed in the base body 20, and the rear end is in contact with or in close contact with the intermediate interlocking member 27. Therefore, when the work contact element 30 is retracted, the intermediate interlocking member 27 is also retracted, and the safety device is unlocked.

  The small diameter portion 30b of the work contact element 30 is opened downward, and a downward stepped portion 30d is formed at the base end portion. The small-diameter portion 30b is non-circular, and the work contact element 30 is held non-rotatable due to this and the fact that the rearward direction and the protruding portion 30c are fitted in the holes of the base body 20.

  In a state where the work contact element 30 has advanced, most of the small diameter portion 30b is opened downward. On the other hand, in the front portion of the launch passage 33 in the base body 20, a wide portion 33a into which a portion of the small diameter portion 30b of the work contact element 30 excluding the downward stepped portion 30d can be fitted. Accordingly, when the work contact element 30 is fully retracted, the base body 20 and the work contact element 30 cooperate to form a movement path for the nail n and the rod 2.

  A front cylindrical portion 20b is formed at the front end of the base body 20 so as to protrude from the front of the share block 29, and as shown in FIG. The downward stepped portion 30d of the small diameter portion 30b is fitted. As can be understood from FIG. 5, the work contact element 30 is only fully exposed at the front end in the retracted state.

  As shown in FIGS. 4 and 9, a first stopper pin 37 positioned in front of the rearward protruding portion 30c of the work contact element 30 is fixed to the upper portion of the front cylindrical portion 20b of the base body 20 by screwing. Yes. The front and rear movement stroke L1 of the work contact element 30 is regulated by the first stopper pin 37 coming into contact with the front end of the rearward protruding portion 30c of the work contact element 30 and the rear end surface of the large-diameter cylindrical portion 30a. It is also possible to configure.

  The lockout probe 31 includes a cylindrical portion 31a that is slidably fitted to the large-diameter cylindrical portion 30a of the work contact element 30 from the outside, and an intermediate interlocking member 27 from the upper rear end of the cylindrical portion 31a. The arm portion 31b is configured to slidably fit in a tunnel-like hole 38 formed in the base body 20. For this reason, the lockout probe 31 is held so that it cannot rotate but can move back and forth. The tunnel-like hole 38 communicates with a hole in which the intermediate interlocking member 27 is fitted, and therefore, the intermediate interlocking member 27 can be pushed by the lockout probe 31.

  As shown in FIGS. 4, 7, and 9, the arm portion 31 b of the lockout probe 31 has an elongated front and rear elongated hole 39, while the base body 20 has a portion behind the front tubular portion 20 b. The second stopper pin 40 that fits into the long hole 39 of the arm portion 31a is attached so as not to be removable, and the lockout probe 31 is held so as not to be removable from the base body 20 by the second stopper pin 40. . With the lockout probe 31 fully advanced, a gap of a certain size L3 is left between the rear end of the arm portion 30b and the intermediate interlocking member 27.

  The forward position of the lockout probe 31 is regulated by the second stopper pin 40 coming into contact with the rear end of the long hole 39 in the arm portion 31a. The retracted position of the lockout probe 31 is the rearward position of the large diameter portion 31a. The end surface is regulated by hitting the front end of the front cylindrical portion 20b in the base body 20 and the second stopper pin 40 hitting the front end of the long hole 39 in the arm portion 31a (any one may be regulated). .) The movement stroke L2 of the lockout probe 31 is smaller than the movement stroke L1 of the work contact element 30 (note that the movement stroke L1 of the work contact element 30 is regulated by the sleeve 19 being moved backward.

(3). Description of Movement As is clear from the above description, when the tip of the work contact element 30 is brought into contact with the surface of the work W and the driving tool is pushed toward the work W, the work contact element 30 is moved to the base body 20. When the sleeve 19 moves backward through the intermediate interlocking member 27 and the actuating member 25 in conjunction with this, the safety device is unlocked and the nail n is driven. Yes.

  At the same time as the rod 2 moves forward and backwards, the connecting mechanism 11 feeds the connecting nail N by one pitch so that the next nail n is supplied to the front of the rod 2 and the connection after the nail n is removed. Body A is also sent by one pitch. When all the nails n have been driven, the connecting body A can be removed from the base body 20.

  Further, since the lockout probe 31 also functions as a holding device for the work contact element 30, the work contact element 30 can be made to largely protrude in front of the base body 20, so that fastening work in a narrow place is not hindered. Yes. In addition, since the lockout probe 31 can be retracted with a finger, the front end portion of the work contact element 30 can be largely exposed to easily recognize the driving position.

  As can be understood from FIG. 9, the work contact element 30 is fully retracted, and the front end portion of the work contact element 30 is exposed from the lockout probe 31 only by a small dimension L4. If it is picked and moved back to the unlocking position (position slightly before the work contact element 30 is fully retracted), the fingertip must overlap the front end surface of the work contact element 30, and then the nail n is driven. Injured by. For this reason, it can be said that it is practically impossible for a person to retract the work contact element 30 with the finger to the unlocked position.

  On the other hand, the intermediate interlocking member 27 is retracted by retracting the lockout probe 31, but the retracting stroke L2 of the lockout probe 31 is smaller than the retracting stroke L1 of the work contact element 30 and the lockout probe 31 is retracted. Therefore, the dimension in which the intermediate interlocking member 27 retracts is (L2-L3), which is considerably smaller than the retracting stroke of the work contact element 30. Therefore, even if a person picks up the lockout probe 31 with his / her finger and retracts it, the safety device is not unlocked and the nail n cannot be fired in the air.

  Furthermore, the intermediate interlocking member 27 and the ring body 26 are hidden inside the base body 20, and for example, a thin object such as a driver is inserted from the outside of the base body 20 to retract the intermediate interlocking member 27 and the ring body 26. Therefore, it is not possible to unlock the safety device by accessing the intermediate interlocking member 27 or the ring body 26. From this point of view, safety is ensured.

  In many cases, the driving tool can adjust the driving depth of the fastener, but in the case of this embodiment, as disclosed in Japanese Patent Application Laid-Open No. 2005-1110, A screw cylinder that contacts the surface of the workpiece W may be screwed into the front end portion, and the dimension of the screw cylinder protruding from the front end of the work contact element 30 may be adjusted.

  The magazine may have an elongated shape (or a drum-like one attached to the elongated portion). In this case, it is preferable that the connecting fastener is sent to the launch passage 33 by a spring-driven follower (pusher). It is. In this way, when the connecting fastener is sent by the follower, the fastener is pushed by the follower claw. Therefore, one or two fasteners positioned at the end of the connecting fastener are used to avoid interference between the follower claw and the rod. It is necessary to regulate so that is not fed into the launch path.

  Therefore, as shown in FIG. 1, a backward-facing stopper portion 31 c is provided in the lower portion of the lockout probe 31 and in the right portion when viewed from the front. When the number of connecting fasteners is, for example, the remaining two, for example, the stopper portion provided on the follower hits the stopper portion 31c of the lockout probe 31 to prevent further movement of the follower. Therefore, if comprised like this embodiment, it can apply also to the driving device of the type which sends a connection fastener with a spring type follower.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, the shape of the connecting body that can be used does not have to be U-shaped, and a simple strip or the like can also be used. Moreover, the connection fastener does not necessarily have to be wound in a coil shape, and may have a form extending linearly. The guide means of the coupling body in the head part may be designed in accordance with the structure and form of the coupling body.

  The form and material of each member can be freely set according to the type of connector, the use of the tool, or the design requirements. For example, the base body can be a sheet metal product. It is also possible to form a pair of members corresponding to the share block of the above-described embodiment on the base body, and it is also possible to configure the base body with a plurality of members. It is also possible to integrate the magazine into the head part.

  Further, the intermediate interlocking member need not be rod-shaped but may be plate-shaped. In this case, the ring body can be integrally formed with the intermediate interlocking member. In the present invention, the lockout probe is not an essential element, and the work contact element can be slidably held on the base body (in this case, a cylindrical forward projecting portion is formed on the base body, It is preferable to attach a work contact element to the forward projecting portion).

It is a side view of the whole driving tool concerning this embodiment. (A) is a longitudinal side view of the main body, and (B) is a perspective view of the operating member. It is an external appearance perspective view of a head part. FIG. 6 is a schematic vertical side view of the head portion in a locked state, and is a cross-sectional view taken along line IV-IV in FIG. It is a front view of a head part. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4. FIG. 7 is a sectional view taken along the line VII-VII in FIG. 4. FIG. 5 is a sectional view taken along the line VIII-VIII in FIG. 4. It is a vertical side view of a driving state. It is a perspective view which shows an example of a coupling body.

Explanation of symbols

DESCRIPTION OF SYMBOLS A Connection body A1 Back plate A2 Holding piece N Connection nail as an example of a connection fastener n Nail unit 1 Main body 2 Rod 3 Head part 4 Magazine 7 Trigger 15 Cylinder 16 Piston 19 Sleeve which constitutes a part of safety device 20 Base body 22 Ring body constituting part of safety device 25 Actuating member constituting part of safety device 30 Work contact element also serving as part of safety device 31 Lockout probe

Claims (2)

A driving tool for loading a connecting fastener attached to a long connecting body in a state where a large number of bar-shaped fasteners are arranged in parallel, projecting the fastener from the connecting body, and driving out one by one,
A main body having a built-in drive mechanism for moving the rod-shaped rod for driving the fastener back and forth; a head portion provided on the front surface of the main body; a magazine attached to the head portion and containing a connecting fastener; and the drive mechanism. Equipped with a trigger to be actuated and a safety device to keep the drive mechanism from being actuated even if the trigger is pulled,
The head portion has a base body having a launch passage through which the rod passes and a discharge passage through which a connecting body after fastener launch passes, and forms a part of the safety device, and at least a front portion is formed in a cylindrical shape through which the rod passes. With the formed work contact element,
The base body is fixed to the main body, and an intermediate interlocking member forming a part of the safety mechanism slides freely in the longitudinal direction of the rod in a portion of the base body that does not buffer the discharge passage. While the intermediate interlocking member is retracted by a predetermined dimension, the safety mechanism is unlocked and the drive mechanism is activated when the trigger is pulled,
The work contact element is attached to the base body in a state where the front part is exposed so that the work contact element moves relatively backward when pressed against the work and the intermediate interlocking member moves backward by a predetermined dimension. The contact element is entirely or mostly covered with the base body or a lockout probe that can be moved back and forth, so that a person cannot pick it with a finger when fully retracted.
Hand-held driving tool. The drive mechanism uses a combustion pressure of gas, and a cylinder in which a piston attached with a rod moves back and forth and a combustion chamber communicating with a cylinder bore are provided in the main body.
The hand-held driving tool according to claim 1.

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