JP4012810B2 - Gas-fired driving tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a driving tool such as a gas combustion type.
[0002]
[Prior art]
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.
[0003]
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.
[0004]
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.
[0005]
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.
[0006]
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.
[0007]
[Patent Document 1]
JP 2001-162560 A
[Patent Document 2]
Japanese Patent Laid-Open No. 2001-170874
[Problems to be solved by the invention]
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.
[0010]
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.
[0011]
The object of the present invention is to develop the concept of the invention of the prior application and further improve the safety function.
[0012]
[Means for Solving the Problems]
Driving tool of the present invention comprises a body rod-shaped blade for driving a fastener and a head on the end of the shaft is built, a head provided at the end of the previous SL Body fastener in front of the blade Magazine, a trigger for driving fasteners, and a movable safety device that moves backward when pressed against a workpiece to release the blade lock. Protective means is 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 attached, and the blade is moved forward by the combustion pressure of the gas.
[0013]
Before SL head is equipped with inner guide movable to guide the advancement movement of the advancing and retreating and fasteners blades, an outer guide fixed to the inner guide is guided so as to move in the axial direction of the blade, the The outer guide and the inner guide have a fastener hole through which the fastener loaded in the magazine passes, and the inner guide is formed by exposing the tip of the inner guide to the outside of the outer guide. serves also as an outer guide part of the protective means as well as combined in a part of the safety device, further, the nose is formed into a cylindrical shape so as to surround the launch passage of the fastener, nose protection When the nose is picked with a finger, the dimension exposed from the means must be set back to the unlocked state. It is set to have dimensions.
[0014]
Further, the outer guide has a safety device long hole opened on the opposite side of the fastener long hole, and the block is slidably fitted in the safety device long hole. The interlocking member is fixed with a screw, and the lock of the safety device is released by retracting the block with the inner guide, and the head includes the block and the interlocking member. The shroud and the outer guide constitute the protection means.
[0015]
[0016]
[0017]
[0018]
[Operation and effect of the invention]
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.
[0019]
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.
[0020]
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.
[0021]
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. .
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0023]
(1) Overall Overview The present 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.
[0024]
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.
[0025]
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.
[0026]
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. .
[0027]
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.
[0028]
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).
[0029]
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.
[0030]
On the other hand, as can be understood from FIG. 4, the outer guide 16 (and the inner guide 17) constituting the head 3 communicates with the first elongated hole 27 of the magazine 4 as a fastener elongated hole described in the claims. A guide projection 30 is formed in the lower member 20 of the outer guide 16 that surrounds the rear portion of the second slot 29, and the guide projection 30 that fits in the guide hole 28 of the magazine 4 is formed. As a result of the fitting of the guide protrusions 30 and the guide holes 28, the magazine 4 is held at the upper portion thereof so as not to be laterally displaced.
[0031]
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.
[0032]
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.
[0033]
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.
[0034]
(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. .
[0035]
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.
[0036]
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.
[0037]
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.
[0038]
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).
[0039]
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.
[0040]
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.
[0041]
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.
[0042]
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.
[0043]
(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.
[0044]
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 can be slidably fitted therein, and the fastener oblong hole described in the claims. As a result, the third long hole 39 of the downward opening through which the fastener 22 passes is vacant.
[0045]
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.
[0046]
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. As shown in FIG. 10 For example, the base portion of the cylindrical portion 19a is slightly larger diameter, and thus the stepped portion 19b is present.
[0047]
As shown in FIG. 6B and FIG. 10, the upper member 19 of the outer guide 16 has a fourth downward opening through which the fastener 22 passes as a fastener long hole described in the claims except for the front portion. A long hole 43 is formed. 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.
[0048]
As shown in FIG. 10, the upper member 19 has a rectangular shape penetrating vertically so as to open on the opposite side of the second long hole 29 and the third long hole 39 as the safety device long hole described in the claims. The fifth elongated hole 44 is formed, and the block 45 is slidably fitted into the fifth elongated hole 44. The block 45 overlaps the small diameter portion 17 a of the inner guide 17.
[0049]
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.
[0050]
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 block 45 and the interlocking plate 46 are also retracted together against the spring.
[0051]
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.
[0052]
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.
[0053]
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.
[0054]
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). Also, as best shown in FIG. 10, the lower member 20, and has the form so as to extend over the entire length of the groove 50 of the inner guide 17 overlap from above.
[0055]
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.
[0056]
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.
[0057]
In the outer guide 16 and the inner guide 17, the long holes 29 , 39 , 43 through which the fasteners 22 pass are considerably longer than the lengths of the connected fasteners 22. For this reason, it is possible to easily insert the fastener when the fastener is struck alone. Of course, the long holes 29 , 39 , and 43 need only be long enough to allow the connected fasteners 22 to pass through.
[0058]
(4) Shroud The shroud 18 is a main element of the protective means, and 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. ing.
[0059]
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.
[0060]
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.
[0061]
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.
[0062]
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.
[0063]
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.
[0064]
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.
[0065]
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.
[0066]
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 simply 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.
[0067]
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.
[0068]
(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.
[Brief description of the drawings]
FIG. 1 is a side view of an entire driving tool according to an embodiment.
FIG. 2 is a perspective view seen from the front.
FIG. 3 is a side view showing a state where a magazine is removed from a main body.
4A is a perspective view of the head 3 in an overturned state, and FIG. 4B is a perspective view of the upper portion of the magazine 4;
FIG. 5 is a perspective view of a front portion of the main body case.
6A is a longitudinal side view of the front part of the main body and the head, and FIG. 6B is a front sectional view showing a state where members are separated.
FIG. 7 is a plan view of the shroud in a broken state.
8 is a cross-sectional view taken along the line VIII-VIII of FIG.
9 is a cross-sectional view taken along the line IX-IX in FIG. 6;
FIG. 10 is an exploded perspective view.
FIG. 11 is a separated side view.
FIG. 12 is an explanatory diagram of a shroud.
[Explanation of symbols]
1 body 2 blade 3 head 4 magazine 5 main case 9 trigger 16 outer guide 17 inner guide 18 shroud <br/> 19 lower member 21 connected fastener constituting the upper member 20 outer guide constituting the outer guide
29 Second slot (fastener slot)
39 4th slot (fastener slot)
43 4th slot (fastener slot)
44 5th long hole (long hole for safety device)
40 Nose 46 Interlocking plate (interlocking member) that forms part of safety device

Claims (1)

A body rod-shaped blade for driving a fastener and a head on the end of the shaft is built, a head provided at the end of the previous SL Body, the magazine for supplying one by one the fastener in front of the blade And a trigger for driving the fastener, and a movable safety device that moves backward when the workpiece is pressed against the workpiece to release the blade launch lock. A driving tool provided with protective means for holding the safety device so that it cannot be operated by a person until it is unlocked and
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, and a fixed outer guide that guides the inner guide so as to move in the axial direction of the blade.
The outer guide and the inner guide have a fastener long hole through which the fastener loaded in the magazine passes,
By exposing the tip of the inner guide to the outside of the outer guide and forming a nose, the inner guide is also used as a part of the safety device and the outer guide is also used as a part of the protection means. the nose is formed into a cylindrical shape so as to surround the launch passage of the fastener, the dimensions nose is exposed from the protective means, it is less likely to retract the nose person to the release state of the lock launch in a state pinched by fingers It has been set to a dimension,
Further, the outer guide has a safety device long hole opened on the opposite side of the fastener long hole, and the block is slidably fitted in the safety device long hole. It is fixed to the interlocking member constituting the device with screws, the safety device is unlocked by retreating the block with the inner guide, and the head is connected to the block and interlocking A shroud covering the member is provided, and the protective means is configured by the shroud and the outer guide;
Gas-fired driving tool.

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