JP2005001110A - Hammering tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a safety function in a hammering tool of a gas combustion type or the like. <P>SOLUTION: A nose provided at the tip of an inner guide 17 is exposed by the stroke dimension required to release strike-out lock, which makes it actually impossible to grip the nose with the fingers to retreat and release the lock. The greater part of a head 3 is covered with a shroud 18. An interlocking plate 46 moving integrally with the inner guide 17 to release the strike-out lock is covered from below with an overhang part 20a provided at a lower member 20 of an outer guide 16, which makes it impossible to put the finger or the like between the shroud 18 and the outer guide 16 to operate the interlocking plate 46. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a driving tool such as a gas combustion type.

  Driving tools such as nailers and hammering tools include those using pneumatic pressure, those using electromagnetic force, and those using gas combustion pressure. An example of a gas combustion type driving tool is described in Patent Literature 1 and Patent Literature 2.

  In these driving tools, a safety device is provided to prevent a blanking shot in the air. This safety device includes a probe that moves backward when it hits a workpiece. When the probe moves backward, the launch lock is released, and when the trigger is pulled, the blade moves forward.

  The driving tool of Patent Document 1 includes a movable inner guide that guides a fastener and a blade, and an outer guide that guides a slide of the inner guide. The tip of the inner guide is slightly extended from the tip of the outer guide. By exposing only the dimensions, the inner guide is also used as a probe, and an interlocking member for releasing the launch lock is fixed to the inner guide.

  In the case of Patent Document 1, since the tip of the inner guide is elongated, for example, there is an advantage that it can be easily driven into a narrow place.

In Patent Document 2, the guide of the fastener and the blade is performed by a fixed guide body fixed to the main body, and a nose that protrudes forward from the distal end portion of the fixed guide body to a probe that functions only as a safety device. Is forming.
JP 2001-162560 A JP 2001-170874 A

  In this way, the safety device of the driving tool is used to release the lock by using the backward movement of the probe, but if the person can move the nose of the probe backward by hand, the lock can be easily released. The meaning as a safety device is lost.

In this regard, in Patent Document 2, the function of the safety device is maintained by making it difficult for a person to pick the nose. Japanese Patent Application Laid-Open No. 2000-354979 and Japanese Patent Application No. 2001-22238, which is a prior application of the applicant of the present application, describe that a portion of the probe excluding the nose is covered with a shroud.

  The object of the present invention is to develop the concept of the invention of the prior application and further improve the safety function.

  According to the first aspect of the present invention, a main body in which a rod-shaped blade for driving a fastener is incorporated, a head provided at the front end of the main body for guiding the blade and the fastener, and the like, one fastener at the front of the blade. In a driving tool equipped with a magazine to be supplied and a movable safety device that moves backward when the workpiece is pressed against the workpiece to release the blade lock, the safety device is driven and unlocked regardless of whether the magazine is installed. Protective measures are provided to keep people from operating.

  In the invention of claim 2, the blade is moved forward by the combustion pressure of the gas, while the head is a movable inner guide that guides the blade forward and backward movement and the fastener forward movement, and the inner guide is a blade. A fixed outer guide that guides it so as to move in the axial direction, and a shroud that surrounds the outer guide from the opposite side of the magazine.

  And the front-end | tip part of the said inner guide is exposed to the outer side of an outer guide and a shroud, and the interlocking member for canceling | releasing launch lock by fixing the inner guide to the part enclosed by the shroud is fixed to the inner guide. By doing so, the inner guide is also used as a part of the safety device.

  Further, the dimension at which the tip of the inner guide is exposed from the outer guide is set to a dimension that cannot be retracted to the unlocked state when the tip is picked up with a finger, and the shroud and outer By enclosing the interlocking member with the guide, the interlocking member cannot be operated even if the magazine is removed, thereby forming a protective means.

  According to the present invention, since the safety device cannot be operated in the unlocked state regardless of whether or not the magazine is attached, the safety function can be ensured.

By the way, in this kind of driving tool, a connecting fastener in which a number of fasteners arranged in parallel are held in a connecting body is used, and this connecting fastener is loaded into a magazine to perform continuous driving. When a long fastener is driven in or when the magazine cannot be installed because of the space at the construction site, the magazine is removed, the worker picks the fasteners one by one, loads them into the head, and strikes them alone Sometimes.

  However, if the safety device can be operated with the magazine removed for single operation, the safety function is not sufficient. Also, if the magazine is removed and the magazine is reattached while holding the safety device in an unlocked state by, for example, sandwiching something, the safety function will be lost.

  On the other hand, in the present invention, since the safety device cannot be operated to the unlocked state even if the magazine is removed, the fastener cannot be made to be idle, and thus the safety function can be ensured. .

  Next, embodiments of the present invention will be described with reference to the drawings.

(1) Overall Overview This embodiment is applied to a driving tool for driving a scissors, pins, or nails using gas combustion pressure. 1 is a side view of the whole, and FIG. 2 is a perspective view as seen from the front. As shown in these figures, the driving tool includes a main body 1 having a built-in blade (rod) 2 and a main body. 1 is provided with a head 3 attached to the front end of 1 and a magazine 4 overlapping the lower surface of the head 3.

  The main body 1 includes a main body case 5 that encloses a cylinder, which will be described later, and a rear case 6 that is attached to the rear end of the main body 1. The gas storage unit 8 is integrally provided. A trigger 9 is provided above the grip 7. A battery storage unit 10 is integrally provided at the lower end of the grip 7, and the battery storage unit 10 and the gas storage unit 8 are integrally connected.

  Reference numeral 11 denotes a lid of the gas storage unit 8. A front cover 12 made of a material such as plastic or rubber is attached to the front of the main body case 5. The front cover 12 is completely or almost in close contact with the outer peripheral surface of the main body case 5, and has a vent hole 13. The vent hole 13 is a filter 14 made of a material such as a fine metal mesh. It is blocked by.

  3 is a side view with the magazine 4 removed from the main body 1, FIG. 4A is a perspective view of the head 3 in an inverted state, and FIG. 3B is a perspective view of the upper portion of the magazine 4. FIG. .

  As will be described in detail later, the head 3 includes a fixed outer guide 16, a movable inner guide 17, and a shroud 18. The outer guide 16 includes an upper member 19 and a lower member 20, and an inner guide 17 is disposed between the upper and lower members 19 and 20.

  The magazine 4 includes a storage portion 24 having a groove 23 in which the connecting fastener 21 is loaded, and an upper reinforcing member 25 fixed to the upper end thereof. The storage portion 24 pushes the connecting fastener 21 upward. The pusher 26 is attached. The pusher 26 is pulled upward by a spring (not shown).

As can be understood from FIG. 4, the upper reinforcing member 25 of the magazine 4 has a first elongated hole 27 through which the fastener 22 is pulled out, and a portion of the first elongated hole 27 from which the head of the fastener 22 is pulled out is oblong and wide. This is a guide hole 28.

  On the other hand, as can be understood from FIG. 4, the outer guide 16 (and the inner guide 17) constituting the head 3 has a second elongated hole 29 communicating with the first elongated hole 27 of the magazine 4. A guide protrusion 30 that fits in the guide hole 28 of the magazine 4 is formed on a portion of the lower member 20 of the guide 16 that surrounds the rear portion of the second long hole 29. The guide protrusion 30 and the guide hole 28 are connected to each other. By the fitting, the magazine 4 is held at the upper part thereof so as not to be laterally displaced.

  Further, as shown in FIG. 3, an upward hook-like locking part 31 is provided on the rear surface of the lower end of the magazine 4 in a side view, while the locking part 31 is provided on the forward projecting part 32 provided at the lower end of the gas storage part 8. A guide groove (not shown) that fits from below is formed, and the locking portion 31 is sandwiched and fixed to the forward projecting portion 32 by a screw (not shown) screwed from the opposite side of the paper surface in FIGS. It has become.

  At the lower end of the magazine 4, a stopper portion 33 is provided so as to contact the surface of the workpiece. This is in order to reduce the burden on the operator while driving the fastener 22 in an accurate posture by driving in a two-point support state.

  In the present embodiment, the alignment direction of the connecting fasteners 22 is orthogonal to the axis of the blade 2, but as disclosed in Patent Document 1, the alignment direction of the fasteners 22 is inclined with respect to the axis of the blade 2. Also good.

(2) Outline of Main Body Next, an outline of the main body 1 will be described with reference to FIGS. FIG. 5 is a perspective view of the front portion of the main body case 5, FIG. 6A is a vertical side view of the front portion of the main body 1 and the head 3, and FIG. 5B is a front sectional view of a state where members are separated. .

  As shown in FIG. 6, a cylinder 35 is disposed inside the main body case 5, and a piston (not shown) including the blade 2 is slidably fitted into the cylinder 35. A bush 36 for guiding the blade 2 is mounted outside the front end portion of the cylinder 35, and a cushion rubber 37 is fitted into the front portion inside the cylinder 35. An exhaust hole (not shown) is formed in the front portion of the peripheral wall of the cylinder 35, and the combustion gas is discharged from the exhaust hole to the outside of the cylinder 35.

  Although not shown, a launch lock device is provided inside the main body 1 so that the blade 2 does not advance even if the trigger 9 is simply pulled. Various devices can be used as the launch lock device. For example, it can be a valve device provided in an appropriate part of a pipeline or the like for supplying fuel gas to the cylinder 35. In this case, the fuel gas cannot be supplied to the cylinder 35 even if the trigger 9 is pulled unless the lock on the valve device is released.

  As another locking device, for example, an electromagnetic valve provided at a jet port of a gas cartridge (cylinder) can be used. In this case, if the solenoid valve is not energized, the fuel gas is not supplied to the cylinder 35 even when the trigger 9 is pulled.

  Further, as another locking device, it is possible to provide a switch in the circuit for ignition, or to lock the trigger 9 itself (it is more preferable to use the lock on the trigger 9 itself and other methods together). is there).

An opening 38 for evacuating exhaust is vacant in the front portion of the main body case 5, and the combustion gas is discharged to the outside from the opening and discharged to the outside of the main body 1 from the vent hole 13 of the front cover 12. The The vent hole 13 is basically for exhaust, but dust floating outside the vent hole 13 is sucked into the cylinder 35 due to a negative pressure effect generated when the blade 2 moves backward. There is. This dust may adhere to the inner surface of the cylinder 35 and cause malfunction or failure.

  In particular, in the case of driving work into a stone-type workpiece such as concrete or brick such as ALC, since the abrasion effect by dust is large, the dust is clogged between the cylinder 35 and the piston, or it is attached to the piston. The sealing ring (for example, O-ring) is often damaged, and the frequency of occurrence of malfunctions and failures is high.

  On the other hand, when the opening 38 of the main body case 5 is sealed with the front cover 12 and the filter 14 is provided in the vent hole 13 as in the present embodiment, dust is prevented from entering the cylinder 35 or Since it can be remarkably suppressed, there is an advantage that the malfunction rate and failure rate due to dust can be significantly reduced.

  Even if dust adheres to the filter 14, the dust is blown outward by the exhaust air, so that the filter can be prevented from being clogged. That is, it can be said that the driving tool has a self-cleaning function of the filter 14. Needless to say, providing a cover with a filter on the main body 1 such as the front cover 12 can also be applied to driving tools of other modes. Moreover, you may block | close the opening part of the main body case 5 with a filter directly.

(3). Structure of Head Next, the structure of the head 3 will be described with reference to FIG. 7 is a plan view with the shroud 18 broken, FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 6, FIG. 9 is a sectional view taken along the line IX-IX in FIG. 12 is a detailed side view of the shroud 18. FIG. 12A is a bottom view, FIG. 12B is a front view, FIG. 12C is a cross-sectional view taken along line BB in FIG. It is DD sectional view taken on the line.

  As described above, the head 3 includes the outer guide 16, the inner guide 17, and the shroud 18 made of a metal plate (for example, a steel plate). For example, as can be understood from FIG. 10, the inner guide 17 is formed in a cylindrical shape as a whole so that the blade 2 is slidably fitted therein, and a third downward opening through which the fastener 22 passes. The long hole 39 is vacant.

  A male screw is formed at the tip of the inner guide 17, and a nose 40 for adjusting the driving depth is screwed into the male screw. Moreover, the range near the rear end of the inner guide 17 is a small-diameter portion 17a. For this reason, a step 17b exists in the middle portion along the longitudinal direction. The rear end portion of the inner guide 17 is a cylindrical portion 17c.

  Of the upper member 19 constituting the outer guide 16, a substantially forward portion is a cylindrical portion 19 a, and the rear portion is wider than that. As shown in FIG. 9, the rear end portion of the upper member 19 is fixed or attached to a block portion 41 protruding from the front surface of the cylinder 35 with a screw 42 or a pin. For example, as shown in FIG. 10, the base portion of the cylindrical portion 19a has a slightly larger diameter, and therefore a step portion 19b exists.

  As shown in FIG. 6B and FIG. 10, the upper member 19 of the outer guide 16 is formed with a fourth long hole 43 having a downward opening through which the fastener 22 passes, except for the front portion. The portion where the fourth elongated hole 43 is formed is cut out so that the lower surface thereof is located above the lower surface of the cylindrical portion 19a, and the lower member 20 overlaps with the cut-out portion and is fixed with screws. Has been.

  As shown in FIG. 10, the upper member 19 is formed with a rectangular fifth long hole 44 penetrating vertically, and a block 45 is slidably fitted into the fourth long hole 44. The block 45 overlaps the small diameter portion 17 a of the inner guide 17.

  On the upper surface of the block 45, an interlocking plate (interlocking member) 46 constituting a part of the safety device is fixed with a screw 48 via a pressing plate 47. The holding plate 47 may be omitted. The interlocking plate 46 includes a pair of extension portions 46a extending rearward from the outside of the upper member 19, and the distal ends of the extension portions 46a are engaged or abutted with a launch lock member (for example, a valve device). Therefore, when the interlocking plate 46 is fully retracted, the safety device is unlocked.

  The interlocking plate 46 is moved back and forth by a predetermined distance by a stroke holding means (not shown), and is pushed forward by a spring (not shown). When the inner guide 17 is retracted, the interlocking plate 46 is also retracted together against the spring.

  The nose 40 of the inner guide 17 is exposed from the tip of the upper member 19 in the outer guide 16, and the nose 40 is hardly exposed from the upper member 19 (preferably, the tip of the nose 40 and the tip of the cylindrical portion 19a are It is set so that the launch lock is not released unless it is retracted to a state where the surfaces are almost the same.

  The nose 40 (the tip of the inner guide 17 when the nose 40 is not present) can be picked with a finger. In that case, if the person can hold the nose 40 until it can be retracted to the extent that the safety device is unlocked, the meaning of the safety device disappears.

  In contrast, in the present embodiment, if the finger nose 40 is to be grasped with the finger to the retracted position where the lock is released, the tip of the finger is forced to press the tip end surface of the nose 40. Your fingertips are located on the top and you will be injured. For this reason, it is virtually impossible to retract the nose 40 with a finger, and thus a safety function can be ensured.

  As described above, the lower member 20 of the outer guide 16 overlaps the range in which the fourth elongated hole 43 is formed in the upper member 19, has a plate shape as a whole, and includes a screw 49. It is fixed to the upper member 19 (see FIG. 11). Further, as clearly shown in FIG. 10, the lower member 20 is formed with a groove 50 where the inner guide 17 overlaps from above so as to extend over the entire length.

  In the rear portion of the lower member 20, a recess 50 a is formed in which the rear end cylindrical portion 17 c of the inner guide 17 is fitted. Due to the recess 50a, the inner guide 17 is held so that it cannot be removed.

  The lower member 20 of the outer guide 16 is provided with an overhanging portion 20 a that spreads outside the wide portion 19 b of the upper member 19. On the other hand, the interlocking plate 46 is formed with a folded portion 46b that overlaps the protruding portion 20a in plan view.

  In the outer guide 16 and the inner guide 17, the long holes 29 and 39 through which the fastener 22 passes are considerably longer than the length of the connected fastener 22. For this reason, it is possible to easily insert the fastener when the fastener is struck alone. Of course, it is sufficient for the length of the long holes 29... To be at least as long as the connected fasteners 22 can pass through.

(4). Shroud The shroud 18 is formed so as to cover the rear portion of the outer guide 16 from the step portion 19b of the cylindrical portion 19a, and the interlocking plate 46 is also covered with the shroud 18.

  In addition, the shroud 18 basically has a shape that follows the planar shape of the outer guide 16, but since the rear portion of the planar shape of the outer guide 16 is wide, the shroud 18 also has a shape and interlocking with the outer guide 16. In accordance with the arrangement of the plate 46, it has a stepped shape so that the rear has a large diameter.

  Importantly, by providing an overhanging portion 20 a on the lower member 20 of the outer guide 16, consideration is given so that a person cannot insert a finger, a screwdriver or the like between the lower member 20 and the shroud 18.

  For this reason, the interlocking plate 46 is retracted in a single shot with the magazine 4 removed to release the safety function, or once the magazine 4 is removed, an object is inserted into the gap to hold the interlocking plate 46 in the retracted state. Safety can be ensured by eliminating dangerous acts such as. Note that the shroud 18 may be formed in close contact or in close contact with the lower member 20 instead of providing the protruding portion 20 a on the lower member 20 of the outer guide 16.

  An end plate 51 is integrally provided at the rear end of the shroud 18 by welding or the like, and the end plate 51 is fixed to the front surface of the cylinder 35 with a screw 52. In this case, a pair of left and right screw insertion holes 53 are provided slightly below the end plate 51 and are fixed by the two screws 52 inserted therein, and an engagement hole provided in the upper end portion of the end plate 51. 54 is fitted into a pin 55 (substitute with a screw) projecting from the front surface of the main body 1.

  The upper end portion of the end plate 51 is not fixed with the screw 52 because the upper end portion is covered with the shroud 18 and a tool such as a screwdriver for rotating the screw cannot be inserted. By fitting the upper end of the end plate 51 into the pin 55 as in the present embodiment, the shroud 18 can be prevented from falling down, so that sufficient mounting strength can be ensured even if the two screws 52 are used. be able to.

  The pin 55 and the engagement hole 54 are an example of an engagement means for maintaining the posture of the end plate 51. Instead of the combination of the pin 55 and the engagement hole 54, for example, an upward hook and a downward hook are fitted. Various other engagement means such as mating can also be employed.

  In addition, since safety cannot be ensured if the shroud 18 can be easily removed, a screw 52 for fixing the shroud 18 having a special engagement hole that is difficult to rotate with a normal + or-driver or a square wrench is used. Thus, it is preferable that the user and bag cannot be easily removed.

  For example, as easily understood from FIG. 6, the front end portion of the front cover 12 covers the base portion of the shroud 18. Thereby, while being able to improve a sealing performance, the attachment strength of the shroud 18 can also be improved. For example, as shown in FIG. 4, the front cover 12 is prevented from coming off by fitting a claw 12 a provided at the lower end thereof into a hole (not shown) formed in the main body case 5. At the time of mounting, the claw 12a is elastically deformed and fitted into the hole.

  In the embodiment, the outer guide 16 is a vertical separation system, but it can also be an integral system. Further, as indicated by a one-dot chain line in FIG. 6, the front portion of the shroud 18 can be constituted by a complete cylindrical portion 18 a. This is an advantage that the strength of the shroud 18 can be improved.

(5). Others The present invention can be embodied in various ways other than the above embodiment. For example, the form of the head can be variously embodied as necessary. The present invention can also be applied to a driving tool of the type described in Patent Document 2.

It is a side view of the whole driving tool concerning an embodiment. It is the perspective view seen from the front. It is a side view in the state where a magazine was removed from a main part. (A) is a perspective view of the head 3 in an inverted state, and (B) is a perspective view of the upper part of the magazine 4. It is a perspective view of the front part of a main part case. (A) is a longitudinal sectional side view of the front part of the main body and the head, and (B) is a front sectional view of a state where members are separated. It is a top view in the state where a shroud was fractured. It is VIII-VIII sectional view taken on the line of FIG. It is IX-IX sectional view taken on the line of FIG. FIG. FIG. It is explanatory drawing of a shroud.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Blade 3 Head 4 Magazine 5 Main body case 9 Trigger 16 Outer guide 17 Inner guide 18 The shroud which is a main element of a protection means 19 The upper member which comprises an outer guide 20 The lower member which comprises an outer guide 21 Connecting fastener 40 Nose 46 Interlocking plate that forms part of the safety device

Claims (2)

A main body with a rod-shaped blade for driving a fastener, a head provided at the tip of the main body for guiding the blade and the fastener, a magazine for supplying one fastener one by one to the front of the blade, and a workpiece A driving tool provided with a movable safety device that moves backward when released to release the blade lock.
Protective means are provided to hold the safety device so that it cannot be operated by a person until it is unlocked regardless of whether or not the magazine is installed.
Driving tool. While the blade is moved forward by the combustion pressure of the gas,
The head includes a movable inner guide that guides the forward and backward movement of the blade and the forward movement of the fastener, a fixed outer guide that guides the inner guide so as to move in the axial direction of the blade, and an outer outer guide that faces the magazine. And a shroud surrounding the guide,
The front end portion of the inner guide is exposed to the outside of the outer guide and the shroud, and an interlocking member for releasing the lock by the backward movement of the inner guide is fixed to a portion of the inner guide surrounded by the shroud. By using the inner guide as part of the safety device,
The dimension at which the tip of the inner guide is exposed from the outer guide is set to a dimension that cannot be retracted to the unlocked state when the tip is picked by a finger, and the shroud and the outer guide By enclosing the interlocking member, it is impossible to operate the interlocking member even if the magazine is removed.
A gas combustion type driving tool according to claim 1.

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