JP2004167662A - Hammering tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a protecting shroud in a hammering tool while securing a safety function. <P>SOLUTION: A head 3 is provided with a guide body 34, a probe 35, an interlocking member 36 and the shroud 5. The guide body 34 comprises a cylindrical narrow part 34b and a wide part 34a continuous with the narrow part 34b. The rear part of the probe 35 is fastened to the interlocking member 36 by a bolt 41. A portion, positioned at the head of the bolt 41, of the shroud 5 is formed as a straight part 5b'. The shroud 5 can thereby be miniaturized, and there is no hole in the shroud 5, which can prevent the illegal release of lock of a safety device by hooking a driver onto the head of the bolt 41, for instance. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a driving tool such as a nailing machine or a driving machine.
[0002]
[Prior art]
Driving tools such as a nailing machine and a nail driving machine include a type using compressed air, a type using electromagnetic force, and a type using combustion pressure of gas. 1 and Patent Document 2.
[0003]
Regardless of the driving principle, the driving tool includes a main body with a built-in rod-shaped blade that drives out fasteners such as nails, a head provided on the front of the main body to guide the driving of the fastener by the blade, and a blade. And a magazine for supplying the fasteners one by one from below in front of the magazine.
[0004]
Also, a safety device is provided to prevent the blade from advancing simply by pulling the trigger to prevent the fastener from being fired at a person or into the air. The head is provided with a probe that retreats when pressed against the work, and the lock of the safety device is released by retreating the probe.
[0005]
The head has, as a basic element, a guide body for guiding the fastener to be launched by the blade. The guide body is composed of a cylindrical narrow portion constituting the front end thereof and a wide portion occupying a considerable portion of the entire length. The reason why the guide body has the wide portion is that a certain width dimension is required for overlapping the magazines and fixing the magazines to the main body.
[0006]
Further, the head is provided with a protective shroud (cover). Examples of the shape of the shroud are described in Patent Documents 1 and 2 described above. For example, in FIGS. 8 to 12 of Patent Literature 1, the shroud has a narrow straight front portion covering the narrow portion of the guide body, and a downwardly extending front portion from the base of the front portion toward the main body in plan view. A form in which the main part of the opening is provided continuously is described.
[0007]
In addition, FIGS. 1 to 6 and Patent Document 2 of Patent Document 1 describe that the shroud has a slightly tapered shape as a whole. Furthermore, the applicant of the present application has disclosed in Patent Document 3 a form in which the front end portion is a narrow, straight front portion, and the main portion gradually widens from the base of the front portion to the rear end.
[0008]
Both shrouds are fixed to the front surface of the main body with screws. For this reason, the rear end of the shroud is provided with an end plate overlapping the front surface of the main body. The end plate is fastened with screws at three places, that is, the upper end and the lower left and right.
[0009]
Of the three screws, two at the lower left and right sides are exposed from the downward opening of the shroud, so they can be rotated with a wrench, but one screw at the upper end is hidden by the shroud. Therefore, in any of the patent documents, a hole into which a wrench or a driver can be inserted is formed in the upper surface of the shroud so that the screw at the upper end can be rotated.
[0010]
[Patent Document 1]
JP 2000-354979 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-781 [Patent Document 3]
Japanese Patent Application No. 2001-22238
[Problems to be solved by the invention]
By the way, as a work to be fastened by a driving tool of a gas type or the like, for example, there is a grooved steel having a small groove width dimension. In the case of such a narrow groove type work, in the form of the shroud described in FIGS. 1 to 6 of Patent Document 1 and Patent Document 2, the probe may be applied to the construction surface while the shroud is held on the end face of the work. It was often impossible to perform the fastening work. In addition, the shroud is in the way, making it difficult to see the location to be driven, making it difficult to work.
[0012]
On the other hand, if the tip of the shroud is formed to be narrow as in FIGS. 7 to 12 and Patent Document 3 of Patent Document 1, the shroud can be prevented from being stuck to the work. It can also be fastened. In addition, since it becomes easy to see the place to be driven, the work becomes easy. In particular, a configuration as disclosed in Patent Document 3 is preferable because the shroud becomes slim and compact.
[0013]
A first object of the present invention is to further develop the prior invention of the present applicant and provide a shroud which is made compact without impairing the cover function. A second object is to prevent unauthorized operation of the probe and improve safety.
[0014]
[Means for Solving the Problems]
The basic configuration of the driving tool according to the present invention is the same as the conventional one, and as described in claim 1, a main body in which a rod-shaped blade for driving a fastener such as a nail or a stud is built in, and provided on the front surface of the main body. And a magazine arranged so as to overlap the lower surface of the head and for supplying fasteners one by one from below in front of the blade.
[0015]
The head covers a guide body fixed to the front surface of the main body to guide the fastener being driven by the blade, a probe having a nose protruding forward from the guide body, and covers the entire guide body and most of the probe. When the probe is pressed against the work and retreats, the lock of the safety device is released, and the forward movement of the blade is allowed.
[0016]
The guide body has a wide portion on which the magazine overlaps, and a narrow portion extending forward from the wide portion, while the probe extends above the guide body, and a rear end thereof is locked with a safety device. Is fixed with a screw to the interlocking member for releasing.
[0017]
The shroud has a narrow front portion surrounding the narrow portion of the guide body and the forward portion of the probe, a wide portion of the guide body, a rear portion of the probe, and a main portion of a downward opening that covers the interlocking member from above. As a means for achieving the first object, the outer shape of the main part is such that the portion located at the rear of the probe is a straight portion, and the portions on both front and rear sides of the straight portion are tapered. It is changed step by step so that it looks like a ball,
In the present invention, the straight portion is a concept including not only a state parallel to the axis of the blade but also a state in which the straight part is tapered at a very gentle angle with respect to the axis of the blade.
[0018]
The second object is achieved by the structure of claim 2. That is, in the configuration of claim 2, the main portion of the shroud has no hole, and an end plate that overlaps the front surface of the main body is integrally provided at the rear end of the main portion. At least both sides of the shaft center and the lower part are fixed to the main body with screws, and the upper end of the end plate is provided with an engagement hole that fits into a pin projecting forward from the main body.
[0019]
[Action and Effect of the Invention]
The shroud preferably does not hinder the magazine mounting and is as compact as possible. Also, it is natural that the movement between the probe and the interlocking member must not be hindered by the shroud.
[0020]
Since the guide body includes a wide portion and a narrow portion, the shroud naturally includes a narrow front portion and a wide, downwardly opening main portion in accordance with the shape of the guide body. And, as described above, conventionally, the main part of the shroud is formed so as to gradually or rapidly expand from the tip to the rear, and therefore, the vertical distance between the rear part of the probe and the shroud is rearward. Spread as you go.
[0021]
On the other hand, in the present invention, since the portion of the main portion of the shroud located at the rear portion of the probe is straight, the main portion of the shroud can be made compact while allowing movement of the probe and the interlocking member. Can be. Thus, it is possible to suppress the shroud from hitting the work or the like, and it is possible to more easily see the driving location, thereby improving workability.
[0022]
By the way, even if the probe is not pressed against the surface of the work, if the probe or the interlocking member is retracted by careless or mischievous means, the fastener can be fired in the air, and the function of the safety device is lost. I will.
[0023]
As described above, the conventional shroud has a hole for operating the screw, but by inserting a screwdriver or the like into this hole and retracting the probe or the interlocking member, the lock of the safety device is illegally locked. There was a risk of being canceled.
[0024]
On the other hand, according to the second aspect of the present invention, since the main portion of the shroud does not have a hole through which the probe and the interlocking member can be operated, the lock of the safety device cannot be illegally released, and the safety function is secured. can do.
[0025]
In addition, since there is no hole in the main part of the shroud, the upper end of the end plate cannot be fixed to the main body with screws, but the pin protruding from the main body and the engagement hole of the end plate are fitted. By doing so, the shroud is held in a state where it is difficult to separate from the main body, so that even if the shroud is simply screwed to the main body at its lower part, high fastening strength can be ensured.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0027]
(1). Overall Overview The present embodiment is applied to a tool for driving fasteners such as tacks and nails by using the combustion pressure of gas as a drive mechanism of a blade.
[0028]
FIG. 1 is an overall side view, and FIG. 2 is a side view in a separated state. As shown in these figures, a driving tool includes a main body 1 having a driving blade (rod) 2 built therein, and a main body 1 having a built-in blade. A head 3 is provided at a front end, and a magazine 4 overlapping the head 3 and the main body 1 is provided. The head 3 has a protective shroud 5.
[0029]
The main body 1 includes a main case (main housing) 6 surrounding a cylinder described later, a front case (front housing) 7 attached to a front end thereof, and a rear case (rear housing) 8 attached to a rear end of the main case 6. A grip 9 is provided on the lower surface of the main case 6 so as to be inclined in a side view. The grip 9 has a trigger 10.
[0030]
A gas cylinder (gas cartridge) serving as a driving source is inserted from behind into a gas storage portion 11 provided in a portion of the main case 6 above the grip 9. A portion of the main case 6 in front of the gas storage portion 11 is an inclined portion 12 extending parallel to the grip 9 in a side view.
[0031]
The magazine 4 includes a storage section 14 having a vertically elongated groove 13, and a mounting section 16 overlapping the inclined section 12 of the main case 6 and the lower end of the grip 9. A connecting fastener 19 formed by connecting a number of fasteners 17 arranged in parallel with a connecting tool 18 is loaded in the groove 13 of the storage portion 14. Left and right two pins 21 for positioning extend obliquely from the upper member 20 that forms the upper end of the storage unit 14. Although details are omitted, the fastener 17 is extended upward from a slot provided in the upper member 20.
[0032]
Further, a pusher 22 for pushing the connecting fastener 19 upward is attached to the storage section 14. The pusher 22 is pulled upward by a spring (not shown).
[0033]
At the lower end of the mounting portion 16 and the lower end of the grip 9, overlapping portions 16a and 9a are provided so as to overlap each other, and these overlapping portions 16a and 9a are fastened by screws provided on the knob 23. I have.
[0034]
(2). Next, the internal structure of the main body 1 will be described with reference to FIGS. FIG. 3 is a vertical side view, and FIG. 4 is an exploded perspective view.
[0035]
As shown in FIG. 3, a cylinder (sleeve) 25 is incorporated inside the main case and the front case 7, and a piston (not shown) having the blade 2 is slidably fitted into the cylinder 25. Have been. A cushion rubber 26 is fitted into a front end inside the cylinder 25.
[0036]
Although not shown, a safety device is provided inside the main body 1 to lock the blade 2 so that the blade 2 does not advance even if the trigger 10 is simply pulled. This safety device can be, for example, a valve device provided at an appropriate position in a pipe or the like for supplying fuel gas to the cylinder 25. In this case, unless the lock on the valve device is released, the fuel gas cannot be supplied to the cylinder 25 even if the trigger 10 is pulled.
[0037]
An operation plate 27 for releasing the lock of the safety device is disposed above the cylinder 25. When the operation plate 27 retreats, the lock of the safety device is released. The safety device may employ various mechanisms, and the operation plate 27 may be disposed on both left and right sides of the cylinder 25.
[0038]
A front opening portion 28 is formed at the front end portion of the cylinder 25, and a front end portion 27 a of an operation plate 27 is disposed in the recess 28, and is pressed forward by a spring 29.
[0039]
As shown in FIG. 4, the operation plate 27 extends rearward from the front end portion 27a along both the upper and lower sides of the cylinder 25, and the portion extending rearward has a forked shape. The base of the bifurcated portion is fitted in a long hole 31 (see FIG. 3) formed in the front end of the cylinder 25. The movement stroke of the operation plate 27 is regulated by the elongated hole 31. The blade 2 penetrates the downwardly bent portion 27a of the working plate 27. The operation plate 27 may regulate the stroke at another position.
[0040]
At the front end of the cylinder 25, a front plate 32 for closing the recess 28 is mounted. Although not shown, an exhaust hole is formed in the front portion of the peripheral wall of the cylinder 25, and the air and the combustion gas pushed by the forward movement of the piston are discharged from the exhaust hole to the outside of the cylinder 25. . The front case 7 has a forward opening for allowing exhaust air to escape.
[0041]
(3). Structure of Head Next, the structure of the head 3 will be described with reference to FIGS. 5A is a right side view of the shroud 5, FIG. 5B is a bottom view, FIG. 5C is a front view, FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 3, and FIG. It is a VII view.
[0042]
The head 3 includes a guide body 34, a probe 35 and an interlocking member 36 disposed above the guide body 34, and the shroud 5 described above. The guide body 34 guides the forward movement of the fastener 17 and the blade 2, and includes a wide portion 34a on which the magazine 4 overlaps from below and a tubular narrow portion 34b integrally provided at the front end thereof. The front end of the wide portion 34a is continuous with the narrow portion 34b while narrowing in plan view. The narrow portion 34b may have a shape opening downward.
[0043]
A pair of positioning holes 37 into which the pins 21 protruding from the magazine 4 are fitted are provided in the wide portion 34 a of the guide body 34. In order to enhance the stability of the pin 21, an upward projection 38 is provided at the position of the positioning hole 37. Further, as can be understood from FIG. 3, a guide groove 39 having a downward opening through which the fastener 17 and the blade 2 pass is vacant in the wide portion 34a. As shown in FIGS. 3 and 6, the guide body 34 is attached to a block portion 32 a protruding from the front plate 32 of the main body 1 with bolts 40, pins, or the like.
[0044]
The probe 35 has a nose 35 a exposed from the distal end of the guide body 34. The rear part of the probe 35 and the entire interlocking member 36 are vertically overlapped and fastened with bolts 41. At the rear end of the interlocking member 36, a downward bent portion 36a that fits into the recess 28 of the cylinder 25 is provided. A washer is interposed between the downward bent portions 35a and 27a of the probe 35 and the operation plate 27.
[0045]
When the probe 35 is pressed against a work (not shown) and retracted until the tip of the nose 35a is substantially in the same state as the entire surface of the guide body 34, the lock of the safety device is released. Further, since the stroke of the blade 2 is constant, if the front-back position of the probe 35 is changed, the advance position of the blade 2 with respect to the surface of the work is changed, and the driving depth can be changed.
[0046]
The shroud 5 covers the entirety of the guide body 34 and the interlocking member 36 and the portion of the probe 35 except for the nose 35a. And a main portion 5b having a downward opening that covers the wide portion 34a of the guide body 34 and the interlocking member 36 from above. The front part 5a is formed in a vertically long oval shape. On the other hand, the main portion 5b is basically circular, and is opened downward so that the mounting of the magazine 4 is not hindered.
[0047]
The portion of the main portion 5b located at the overlap portion with the probe 35, the interlocking member 36, and the straight portion 5b 'having a radius close to the head of the bolt 41 is formed on both front and rear sides of the straight portion 5b'. Are formed in a tapered shape of pre-constriction. For this reason, the outer shape of the main part 5b is stepped.
[0048]
A ring-shaped end plate 5c is provided at the rear end of the main portion 5b. The end plate 5c is fitted in a shallow concave portion 43 formed on the front surface of the front case 7. The end plate 5c is fastened to the cylinder 25 together with the front plate 32 with screws 44 at both sides and a lower portion of the end plate 5c across the axis. An engagement hole 45 is formed in the upper end of the end plate 5c, and this engagement hole 45 is inserted into the cylinder 25 through the front case 7 and the front plate 32 and is screwed into the cylinder 25 (in place of a screw). 46. The engagement hole 45 and the pin 46 are fitted so that there is almost no play.
[0049]
(4). Conclusion The size of the front portion 5a of the shroud 5 (the volume of the front section) is defined by the relationship with the narrow portion 34b of the guide body 34 and the probe 35, and the size of the rear end of the main portion 5b is Defined by the recess 43, the main part 5b necessarily has a larger rear portion than its front portion.
[0050]
Since the portion of the main portion 5b of the shroud 5 located at the overlapping portion of the probe 35 and the interlocking member 36 is formed as a straight portion 5b 'close to the head of the bolt 41, the probe 35 moves. The main portion 5b can be made compact without hindering the operation.
[0051]
In addition, since there is no through hole in the main portion 5b of the shroud 5, the probe 35 and the interlocking member 36 cannot be operated unless the shroud 5 is removed, thereby preventing unauthorized unlocking of the safety device. . Note that there is no gap between the shroud 5 and the guide body 34 in which fingers and tools can be inserted, and therefore, even if the magazine 4 is removed, the probe 35 and the interlocking member 36 cannot be operated.
[0052]
The probe 35 is fixed with two screws 44. Since the upper end of the end plate 5c of the probe 35 is fitted to the pin 46, for example, even if a downward external force acts on the tip of the shroud 5, the pin 35 Deformation and displacement are prevented by the holding action of 45, so that a high fastening force can be secured even with only two screws 44.
[0053]
When the end plate 5c is formed in a ring shape as in the present embodiment, the strength of the end plate 5c is remarkably increased, and the shroud 5 is hardly deformed. Therefore, it is particularly preferable in terms of maintaining the fastening strength. In addition, if the main portion 5b of the shroud 5 is basically formed in a circular shape, there is an advantage that the material plate can be easily deformed by bending the material plate and manufacturing the shroud 5 by uniformly deforming the material plate. is there. Of course, it is also possible to form a flat or elliptical shape when viewed from the front.
[0054]
The portion of the shroud 5 located at the overlapping portion between the probe 35 and the interlocking member 36 may be formed at least substantially in parallel to the axis of the blade 2 or at a gentle inclination in at least a side view. When formed in a straight shape, there is an advantage that the size can be further reduced and the aesthetic feeling is excellent.
[0055]
In the present embodiment, the portion of the shroud 5 behind the straight portion 5b 'is inclined at a slightly larger angle and then changes in two steps so that the angle becomes a gentle angle. As shown by, it may be inclined at a substantially constant angle.
[0056]
By the way, if the shroud 5 can be easily removed, the safety function is impaired. Therefore, the tool hole at the head of the screw 44 for fixing the shroud 5 is formed into a special shape that cannot be rotated with a general tool such as a + or-screwdriver or a hexagon wrench, so that even users can easily do so. It is preferred that it cannot be removed.
[0057]
The end plate 5c can be fixed to the main body 1 with three or more screws 44. Further, the engagement means for engaging the end plate 5c with the main body 1 at the upper portion thereof is not limited to the fitting of the pin 46 and the engagement hole 45 as in the embodiment, for example, hooking between hooks, Various modes such as a combination of a hook and an engagement hole can be adopted.
[0058]
In this embodiment, the front and rear positions of the probe 35 can be adjusted by forming a long hole in the interlocking member 36 and forming a female screw hole in the probe 35. However, a conical hole is formed in the interlocking member 36. At the same time, a long hole may be formed in the probe 35, and the countersunk screw 44 inserted into both holes may be screwed into a nut overlapping the lower surface of the probe 35. In this case, the diameter of the straight portion 5b 'of the shroud 5 can be reduced. It is possible to further reduce the size.
[0059]
(5). Others The present invention can be embodied in various ways other than the above-described embodiment. For example, the narrow portion of the shroud is not limited to being formed in a cylindrical shape, and may be opened downward (however, it is preferable to be formed in a cylindrical shape from the viewpoint of securing strength).
[0060]
Alternatively, the nose of the probe may be formed in a cylindrical shape, and a cylindrical nut for adjusting the depth may be screwed into the nose. Further, the present invention can be applied not only to a gas-fired type driving tool but also to other types of driving tools such as a pneumatic type and an electromagnetic type.
[0061]
It should be noted that securing the function of the safety device by making the shroud have no hole can be an invention independent of providing a straight portion on the shroud.
[Brief description of the drawings]
FIG. 1 is an overall side view of a driving tool according to an embodiment of the present invention.
FIG. 2 is a side view in a state where main members are separated.
FIG. 3 is a vertical sectional side view.
FIG. 4 is an exploded perspective view.
FIG. 5 is a view showing a shroud, (A) is a right side view, (B) is a bottom view, and (C) is a front view.
FIG. 6 is a sectional view taken along line VI-VI of FIG. 3;
FIG. 7 is a view taken along the line VII-VII of FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Blade 3 Head 4 Magazine 5 Shroud 5a Front part 5b Main part 5b 'Straight part 19 Connection fastener 25 Cylinder 32 Front plate 34 Guide body 34a Wide part 34b Narrow part 35 Probe 35a Nose 36 Interlocking member 41 Bolt 44 Screw 45 engagement hole 46 pin

Claims (2)

A main body with a built-in rod-shaped blade for punching out fasteners such as nails and tacks, a head provided on the front of the main body, and a zipper that is arranged so as to overlap the lower surface of the head and supplies one fastener from the bottom to the front of the blade. With a magazine,
The head covers a guide body fixed to the front surface of the main body to guide the fastener being driven by the blade, a probe having a nose protruding forward from the guide body, and covers the entire guide body and most of the probe. A shroud, wherein when the probe is pressed against the workpiece and retreats, the locking of the safety device is released and the forward movement of the blade is allowed, and a driving tool,
The guide body includes a wide portion on which the magazine overlaps, and a narrow portion extending forward from the wide portion,
The probe extends above the guide body, and its rear end is fixed with a screw to an interlocking member for unlocking the safety device,
Further, the shroud has a narrow front portion surrounding the narrow portion of the guide body and the forward portion of the probe, a wide portion of the guide body, a rear portion of the probe, and a main portion of a downward opening that covers the interlocking member from above. The outer shape of the main part is changed stepwise so that the part located at the rear part of the probe becomes a straight part, and the parts on both sides before and after the straight part become tapered. Yes,
Driving tool. There is no hole in the main part of the shroud, and at the rear end of the main part, an end plate overlapping the front surface of the main body is provided integrally, and at least both ends of the end plate sandwiching the axis and The lower part is fixed to the main body with screws, and the upper end of the end plate is provided with an engagement hole that fits into a pin that projects forward from the main body,
A driving tool according to claim 1.

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