JP4137607B2 - Gas-fired driving tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas combustion type driving tool.
[0002]
[Prior art]
Driving tools such as nailing machines and nailing machines include those using compressed air, 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]
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. Only the dimensions are exposed. When the inner guide moves backward by pushing the tip of the inner guide against the workpiece, the lock is released, and when the trigger is pulled, the blade moves forward.
[0004]
In the case of Patent Document 1, since the distal end portion of the outer guide is elongated, for example, there is an advantage that it can be easily driven into a narrow place.
[0005]
In Patent Document 2, the guide of the fastener and the blade is performed by a fixed guide member fixed to the main body, and a probe having a nose that hits a work is provided as a safety device. The nose is cylindrical and covers the tip of the fixed guide member.
[0006]
When using these driving tools to drive a fastener such as a heel into a workpiece, for example, driving the head into a state where it protrudes from the surface of the workpiece, or driving into a state where the head is recessed into the workpiece. There are times when I want to change the driving depth. For this reason, the driving depth can be adjusted.
[0007]
In Patent Document 1, as the driving depth adjusting means, in the interlocking member forming a part of the safety device, the block pushed by the inner guide is fixed with a screw, and by adjusting the fixing position of the block in the axial direction of the blade, The position where the inner guide is fully retracted is adjusted.
[0008]
On the other hand, in Patent Document 2, when the probe is fixed to the interlocking member with a screw, the probe mounting position with respect to the interlocking member is shifted in the front-rear direction.
[0009]
[Patent Document 1]
JP 2001-162560 A [Patent Document 2]
Japanese Patent Laid-Open No. 2001-170874
[Problems to be solved by the invention]
However, the adjustment of the driving depth by shifting the inner guide and the probe as a whole is a work of loosening and retightening the screws, and the adjustment work is troublesome. In addition, since the block or probe and the interlocking member only overlap, there is a problem in that it is difficult to grasp how much the two are shifted and it is difficult to adjust accurately.
[0011]
In this type of driving tool, since the interlocking member as a safety device is generally covered with a shroud (cover), the shroud must be removed one by one when adjusting the driving depth. The adjustment was more troublesome.
[0012]
Furthermore, in order to ensure the function of the safety device, it is necessary for even the user not to be able to remove the shroud easily, but this makes it impossible to adjust the depth itself. There was a conflict with the ease of depth adjustment.
[0013]
This invention makes it a subject to improve such a present condition.
[0014]
[Means for Solving the Problems]
The present invention relates to " a main body having a built-in rod-shaped blade for driving a fastener and provided with a trigger for advancing the blade, a cylindrical inner guide for guiding the forward movement of the blade, and the inner guide A fixed outer guide that slidably holds from the outside, and a safety device that locks driving so that the blade does not move forward even if the trigger is pulled unless the inner guide moves backward by a predetermined stroke. Furthermore, the main body is intended for a gas combustion type driving tool having a structure in which a cylinder for moving the blade forward by a gas combustion pressure is incorporated.
[0015]
In claim 1, in the above configuration, the safety device includes an interlocking body exposed outside the outer guide, and the outer guide has an elongated hole for retracting the interlocking body together with the inner guide. The interlocking body of the safety device is surrounded by a shroud so that it cannot be operated by a person, and the outer guide has a cylindrical portion protruding forward of the shroud, while the inner guide A cylindrical driving depth adjusting nose having a portion exposed in front of the outer guide is screwed to the tip of the outer guide, and when the nose is pressed against the work, the exposed portion of the nose is located inside the outer guide. being adapted to enter into, and the nose in the non-implanted state, a dimension forwardly exposed from the outer guide and the release of the implant locking Inner guide is set to a dimension enough substantially the same as the stroke retracts.
[0016]
According to a second aspect of the present invention, in the first aspect, a small-diameter portion having a male screw is formed at the distal end portion of the inner guide, and the female screw of the nose is screwed into the small-diameter portion. The nose is formed with holding means for maintaining the nose in a state where it is not easily rotated, and the nose is formed with wrench engaging means for rotating the nose with a wrench.
[0017]
[Operation and effect of the invention]
According to the present invention, since the adjustment nose is exposed to the outside even if the shroud is provided, the driving depth can be adjusted very easily even if the shroud is attached. In particular, because the nose is threaded, Ru can be accurately finely adjusted by a simple operation.
According to the second aspect of the present invention, there is an advantage that adjustment work can be easily performed while accurately preventing the nose from rotating unexpectedly from the set state.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0019]
(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.
[0020]
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.
[0021]
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.
[0022]
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. .
[0023]
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.
[0024]
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).
[0025]
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.
[0026]
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.
[0027]
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.
[0028]
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.
[0029]
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.
[0030]
(2). Outline inside the main body Next, an outline inside the main body 1 will be described with reference to FIG. 5A is a longitudinal sectional side view of the front portion of the main body 1 and the head 3, and FIG. 5B is a front sectional view showing a state where members are separated.
[0031]
A cylinder 35 is disposed inside the main body case 5, and a piston (not shown) provided with 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.
[0032]
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.
[0033]
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
[0034]
(3). Structure of Head Next, the structure of the head 3 will be described with reference to FIGS. 6 is a plan view with the shroud 18 broken, FIG. 7 is a sectional view taken along the line VII-VII in FIG. 5, FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.
[0035]
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.
[0036]
As will be described in detail later, a cylindrical nose 40 for adjusting the driving depth is screwed into the distal end portion of the inner guide 17. A range near the rear end of the inner guide 17 is a small-diameter portion 17a. For this reason, a step 17b exists in a midway portion along the longitudinal direction. The rear end portion of the inner guide 17 is a cylindrical portion 17c.
[0037]
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. 8, the rear end portion of the upper member 19 is attached to a block portion 41 projecting from the front surface of the cylinder 35 with a screw 42 or a pin. 9 For example, the base portion of the cylindrical portion 19a is slightly larger diameter, and thus the stepped portion 19b is present.
[0038]
As shown in FIG. 5B and FIG. 9, 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 thereof. Portion forming a fourth long hole 43, the lower surface has notched so as to be positioned above the lower surface of the cylindrical portion 19a, fixed with Flip it overlaps the bottom member 20 in this notched portion Has been.
[0039]
As shown in FIG. 9, outer to the upper member 19 of the guide 16, upper and lower are formed the fifth long hole 44 of the prismatic penetrating into the block of the fifth long hole 44, as interlocking member in the safety device 45 is slidably fitted. The block 45 overlaps the small diameter portion 17 a of the inner guide 17.
[0040]
The upper surface of the block 45 is fixed with screws 48 through the interlock plate (interlock member) 46 pressing plate 47 as interlocking body definitive safety device. 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 launch lock is released.
[0041]
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 pushed by the block 45 and retracts together against the spring.
[0042]
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.
[0043]
The nose 40 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.
[0044]
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.
[0045]
The lower member 20 of the outer guide 16 has a plate shape as a whole, and is fixed to the upper member 19 with screws (see FIG. 6). Further, as clearly shown in FIG. 9, the lower member 20 is formed with a groove 50 extending from the upper side so as to extend over the entire length.
[0046]
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 forward.
[0047]
The lower member 20 of the outer guide 16 is provided with an overhanging portion 20 a that spreads outside 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.
[0048]
(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. Of course, the interlocking plate 46 is also covered with the shroud 18. In the present embodiment, since the outer guide 16 has a stepped shape in plan view, the outer diameter of the shroud 18 is also stepwise in plan view in accordance with the shape of the outer guide 16 and the arrangement of the interlocking plates 46. It has a different shape.
[0049]
By providing the 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 driver, or the like between the lower member 20 and the shroud 18.
[0050]
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 are provided slightly below the end plate 51 and are fixed by the two screws 52 inserted therein, and the engagement holes 54 are provided at the upper end of the end plate 51. (See FIG. 5 (A)) is fitted into a pin 55 (substitute with a screw) protruding from the front surface of the main body 1.
[0051]
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 cannot be inserted.
[0052]
(5). Nose Next, the form and mounting structure of the nose 40 will be described mainly with reference to FIGS.
[0053]
10A is a side view of the inner guide 17 with the nose 40 attached, FIG. 10B is a sectional view taken along line BB in FIG. 10A, and FIG. 10C is a view taken along line CC in FIG. 11A is a separated side view, FIG. 11B is a front view of the nose 40, FIG. 11C is a longitudinal side view of the nose 40, and FIG. 11D is a sectional view taken along DD in FIG. FIG. 12 is a diagram showing an example of a driving state.
[0054]
The tip of the inner guide 17 has a two-stage diameter difference between the first small-diameter portion 17d, which is located on the most distal side and is formed with the male screw 57, and the second small-diameter portion 17e having a slightly larger diameter. Is formed.
[0055]
An outward projection 58 projecting with a very small size is formed at the tip of the second small diameter portion 17e, and the projecting height of the outward projection 58 is slightly lower than the projecting height of the outward projection 58 at a position behind the outward projection 58. Four ribs 59 extending in the axial direction at a height are formed at equal intervals in the circumferential direction.
[0056]
On the other hand, the nose 40 is formed to have an outer diameter that is substantially the same as the maximum diameter of the inner guide 17 so that the nose 40 can be slidably fitted to the cylindrical portion 19a of the upper member 19 of the outer guide 16. In addition, an annular groove 60 is formed on the outer periphery near the tip, and a portion behind the annular groove 60 is a split portion 40a in which four slits 61 are formed at equal intervals. Therefore, the split portion 40a can be slightly bent and deformed so as to spread outward in the radius around the root.
[0057]
On the inner peripheral surface of the split portion 40 a in the nose 40, a female screw 62 that is screwed into the male screw 57 of the inner guide 17 and a large diameter portion 63 that fits in the second small diameter portion 17 e of the inner guide 17 are formed. An inward protrusion 64 that protrudes inward with a small size is formed at the rear end of the large diameter portion 63.
[0058]
The inner diameter of the inward projection 64 in the nose 40 is set to be approximately the same size as the second small diameter portion 17 e of the inner guide 17. Further, the groove width of the slit 61 and the width of the rib 59 are set to almost the same dimension. A hexagon hole 65 that can be engaged with a hexagon wrench is formed at the tip of the nose 40.
[0059]
The nose 40 can be screwed into the male screw of the inner guide 17 by bending and deforming the split portion 40a. When the slit 61 fits into the rib 59 at the position of the inward projection 64 in the screwed state, the nose 40 is not easily rotated. That is, every time the nose 40 is rotated 90 degrees, the nose 40 is held at the rotational position.
[0060]
In the rear portion of the split blade 40a in the nose 40, as an example of the indicator means, annular streak lines 66 are engraved at an appropriate interval (for example, 1 mm interval). This group of muscle eyes 66 Ri by to view the state exposed from the cylindrical portion 19a of the upper member 19 can be a guide when adjusting the driving depth.
[0061]
(6) Summary When the nose 40 is pressed against the workpiece W, the interlocking plate 46 is pushed by the inner guide 17 through the block 45 and moves backward. In this case, since the backward stroke of the interlocking plate 46 is constant, the position where the inner guide 17 is fully retracted is always constant.
[0062]
On the other hand, since the stroke of the blade 2 is constant, when the nose 40 is moved and adjusted, the tip surface of the blade 2 in the fully advanced state and the tip surface of the nose 40 in the fully retracted state are relative to each other. The position changes. Thereby, the driving depth of the fastener 22 can be adjusted. FIG. 12 shows a state in which the fastener 22 is driven with the head protruding from the workpiece W.
[0063]
When the head of the fastener 22 is driven into the workpiece W (when deeply driven), the front end face of the blade 2 is advanced by screwing the nose 40 into the inner guide 17 deeper than the state shown in FIG. May reach the surface of the workpiece W.
[0064]
Since the nose 40 is exposed to the outside, even if the interlocking plate 46 is completely surrounded by the shroud 18, the driving depth can be easily and accurately adjusted only by rotating the nose 40 exposed to the outside. be able to.
[0065]
In the present embodiment, the driving depth can be adjusted by a quarter of the pitch of the male screw 57 and the female screw 62 (by 0.25 mm if the pitch is 1 mm). Further, the stopper means comprising the outward protrusion 58 and the inward protrusion 64 can regulate the sliding stroke of the nose 40 and can prevent the nose 40 from falling off. Other stopper means may be employed.
[0066]
The holding means that allows rotation of the nose 40 while allowing rotation is not limited to the combination of the slit 61 and the rib 59 (or the inward projection 64 and the rib 59) as in the embodiment. Various methods such as those using balls or leaf springs can be employed. However, the configuration of the present embodiment has an advantage that the structure is simplified because other members are not necessary.
[0067]
The slits 61 and the ribs 59 are not limited to being arranged at intervals of 90 degrees, but can be set at arbitrary intervals such as intervals of 120 degrees. For example, the slits 61 may be formed in four places and the ribs 59 may be formed in only two places.
[0068]
Providing the nose 40 with a wrench engaging means such as a hexagonal hole 65 has an advantage that the adjustment work can be easily performed while accurately preventing the nose 40 from rotating unexpectedly from the set state. As the wrench engaging means, the outer diameter of the tip of the nose 40 can be a square such as a hexagon.
[0069]
Providing the indicator means for visually confirming the moving distance of the nose 40 has an advantage that the adjustment work can be performed accurately and quickly because it is obvious how much the adjustment should be performed. In this case, if the line of sight 66 is used as the indicator means, it is only necessary to engrave, so that there is an advantage that the processing becomes very simple.
[0070]
(7). Others The present invention can be embodied in various ways other than the above embodiment. For example, in the above embodiment, the nose is screwed into the distal end portion of the inner guide from the outside. May be formed).
[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;
5A is a longitudinal side view of the front part of the main body and the head, and FIG. 5B is a sectional view taken along the line BB of FIG. 5A.
FIG. 6 is a plan view of the shroud in a broken state.
7 is a cross-sectional view taken along the line VII-VII in FIG.
8 is a cross-sectional view taken along the line VIII-VIII of FIG.
FIG. 9 is an exploded perspective view.
10A is a side view of the inner guide with the nose attached, FIG. 10B is a sectional view taken along the line BB in FIG. 10A, and FIG. 10C is a sectional view taken along the line CC in FIG.
11A is a separated side view, FIG. 11B is a front view of the nose, FIG. 11C is a longitudinal side view of the nose, and FIG. 11D is a sectional view taken along the line DD in FIG.
FIG. 12 is a diagram illustrating an example of a driving state.
[Explanation of symbols]
1 Body 2 Blade 3 Head 9 Trigger 16 Outer Guide 17 Inner Guide
17d Small-diameter portion 18 at the tip of the inner guide 18 Shroud 19 Upper member constituting the outer guide 22 Connecting fastener 40 Nose
45 of the slit 62 nose constituting the rib 61 retaining means constituting the male screw 59 holding means of the interlock plate 57 inner guide as interlocking member in the block 46 the safety device as interlocking member in the safety device internal thread
64 Inward projections constituting the holding means

Claims (2)

A main body with a built-in rod-shaped blade for driving fasteners and a trigger for advancing the blade, a cylindrical inner guide for guiding the forward movement of the blade, and a slide of the inner guide from the outside And a safety device that locks the drive so that the blade does not move forward even if the trigger is pulled if the inner guide does not retreat a predetermined stroke. , A cylinder for moving the blade forward by the combustion pressure of the gas is built-in,
In the configuration
The safety device includes an interlocking body exposed to the outside of the outer guide, the outer guide has an elongated hole for retracting the interlocking body together with the inner guide, and the interlocking of the safety device. The body is surrounded by a shroud so that it cannot be operated by a person, and the outer guide has a cylindrical portion protruding forward of the shroud,
A cylindrical driving depth adjusting nose having a portion exposed in front of the outer guide is screwed to the tip of the inner guide, and when the nose is pressed against a work, the exposed portion of the nose is outer. The dimension that allows the nose to be exposed forward from the outer guide in the non-driving state is set to approximately the same dimension as the stroke in which the inner guide moves backward to release the driving lock. is doing,
Gas-fired driving tool. A small-diameter portion having a male screw is formed at the tip of the inner guide, and the female screw of the nose is screwed into the small-diameter portion. Further, the nose is not easily rotated between the inner guide and the nose. A holding means for maintaining the state is formed, and a wrench engaging means for rotating the nose with a wrench is formed on the nose.
A gas combustion type driving tool according to claim 1 .

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