JP5218330B2 - Impact tool - Google Patents

Description

  The present invention relates to an impact tool in which a contact nose constituting a safety device is slidably provided in a driving direction while guiding the driving of the fastener to a driving destination side of a nose portion into which the fastener is driven.

  In general, magazines loaded with multiple fasteners are used for impact tools such as nailers and screwdrivers that use compressed air or combustion gas pressure to drive fasteners such as nails, driving screws, and staples. A fastener having a contact nose on the driving destination side of the nose portion is known in which the fastener supplied to the nosing portion for driving through the fastener supply passage is driven downward by a driver driven by a striking mechanism (Patent Document 1). reference). The contact nose has an injection port for guiding the punched fastener, is slidable along the driving direction, and is normally biased by a spring so as to protrude toward the driving destination. When driving the fastener, the safety device is released only when the tip of the contact nose is pressed against the material to be driven and the contact nose is slid so as to be pushed against the biasing force against the driving direction. The trigger lever is activated and the impact tool is activated.

  A magazine is provided behind the nose portion, and the fastener loaded in the magazine is supplied into the injection port of the nose portion through the fastener supply passage. On the injection port side of the fastener supply passage, a guide groove is formed for guiding the fastener in the injection port so that the foot tip is returned to the injection port when the foot tip is driven to tilt backward. However, if the guide groove is formed on the nose portion side, the height of the entire impact tool is increased. For this reason, as shown in Patent Document 1, a guide groove formed in a contact nose is known.

JP 2004-330372 A

  However, in the configuration in which the guide groove is formed in the contact nose, the groove width of the guide groove has to be increased to some extent. However, when the width is increased, the fastener punched out at the injection port is tilted and the head portion enters the guide groove deeply. It is easy to end up with. In this case, since the fastener is largely inclined, hitting the highly inclined fastener may cause the fastener shank to bend and clog the injection port. If the guide groove is formed in the nose portion, the occurrence of such a problem is reduced, but the overall height of the impact tool is increased.

  In addition, the contact nose is effective as a means for obtaining the verticality of the fastener, but since the posture of the fastener is controlled vertically, a certain length is required, and there is a limit to lowering the overall height. Furthermore, when the contact nose is separated from the nose portion, such as when not in use, a gap is formed between the nose portion and the contact nose, so that the inner surface of the contact nose is gentle. A shape that forms a tapered surface and picks up a fastener is required. However, when the contact nose is pressed against the material to be driven and firmly fitted in the nose part during driving, clearance is necessary so that the nose part bites into the taper surface of the contact nose and does not become integral. There is also a problem that becomes long.

  It is an object of the present invention to provide an impact tool that solves the above-mentioned problems, keeps the overall height of the impact tool low, and controls the fastener so that it does not tilt too much when driven.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a contact nose that guides a fastener that has been driven out to a driving destination side of a nose portion where a fastener supplied from a magazine through a fastener supply passage is driven out by a striking mechanism. In an impact tool slidable along the driving direction, cut out the upper part of the side wall facing the magazine side of the contact nose and pick up the leg tip of the fastener driven out from the nose part into the injection port of the nose part A guide groove is formed toward the fastener supply passage side, and a protrusion that engages with the head of the fastener and holds the fastener so as not to be tilted more than necessary is formed at the opening end of the guide groove. It is characterized by being formed to protrude.

  The invention according to claim 2 is the invention according to claim 1, wherein the fastener hits the side wall on the opposite side of the guide groove at the same height position when the head of the fastener is engaged with the protrusion. It is characterized in that the inclination is less than the time gradient.

  According to a third aspect of the present invention, a contact nose that guides the driven fastener is slid along the driving direction to the driving destination side of the nose portion that drives out the fastener supplied from the magazine through the fastener supply passage by the hitting mechanism. In a possible impact tool, the inner diameter on the tip side of the contact nose is almost the same as the inner diameter of the nose part, and the inner diameter on the base side of the contact nose is the same as or slightly larger than the outer diameter of the nose part. The inner peripheral surface of the intermediate portion of the contact nose and the outer peripheral surface of the tip end side of the nose portion are formed as tapered surfaces having the same inclination angle, and when the fastener is driven, the contact nose slides inside the nose portion. When fitted, the outer peripheral surface of the base portion of the contact nose overlaps with the inner peripheral surface on the tip side of the nose portion. That.

  According to a fourth aspect of the present invention, in the third aspect, the inner peripheral surface of the intermediate portion of the contact nose and the vicinity thereof have a smaller inclination angle than the inner peripheral surface at a constant interval along the circumferential direction. A plurality of ridges having tapered surfaces are formed at equal intervals, and an avoiding portion for avoiding interference with the ridges of the contact nose is formed on the outer peripheral surface on the distal end side of the nose portion.

  According to the first aspect of the present invention, since the protrusion is formed to protrude toward the injection port side at the opening end of the guide groove, when the fastener head is engaged with the protrusion, the fastener shaft is more than necessary. Therefore, since the tip of the driver strikes the portion corresponding to the shaft portion of the fastener, it can be driven well and reliably.

  Moreover, the overall height of the impact tool can be kept low by forming the guide groove in the contact nose.

  According to the invention of claim 2, the angle when the head of the fastener is engaged with the protrusion is inclined when the fastener hits the side wall on the opposite side of the guide groove at the same height position. Since it is suppressed to the following, even if there is a guide groove, it is possible to hit the same or more reliably than when there is no guide groove.

  According to the third aspect of the present invention, the inner diameter of the contact nose at the tip side is substantially the same as the inner diameter of the nose part, and the inner diameter of the contact nose at the base part side is the same as or slightly larger than the outer diameter of the nose part. Forming the inner peripheral surface of the middle part of the contact nose and the outer peripheral surface of the tip end side of the nose part as a tapered surface with the same inclination angle, and when the fastener is driven, the contact nose slides to the inner side of the nose part. Since the outer peripheral surface of the base portion of the contact nose overlaps the inner peripheral surface on the tip end side of the nose portion when fitted into the inner peripheral surface, the inner and outer peripheral surfaces do not galvanize and smoothly after the fastener is driven Get away. Further, the depth of fitting is increased as compared with those having no tapered surface on the tip side of the nose portion, and the overall height of the nailer can be kept low.

  In addition, since the gap between the nose portion and the contact nose is reduced and the inclination angle of the inner peripheral surface of the contact nose can be reduced, the inclination of the fastener is small when driven and the head is caught by the tapered surface. Since the inconvenience is eliminated, the fastener can be driven well and reliably.

  According to the invention which concerns on Claim 4, even if a fastener falls in a contact nose in the state which the contact nose has separated from the nose part, the inclination angle of the protrusion of the inner peripheral surface of the contact nose which the head of a fastener engages Is small, the inclination of the fastener is also small, and the posture of the fastener is not disturbed. For this reason, the inconvenience that the head is caught on the inner peripheral surface is solved, and the fastener can be driven well and reliably.

  Also, when driving the nail, when the contact nose is pushed into the nose part side and slid by pressing the contact nose against the workpiece, the base of the contact nose is fitted to the nose part. The ridge fits in the avoidance part on the tip side of the nose part. Therefore, since the overlapping surface of the nose portion 3 and the contact nose 12 is enlarged and the fitting depth is increased, the overall height of the impact tool can be kept low.

Sectional drawing which showed the cross section of the nailing machine which concerns on this invention in the state from which the door of the nail supply passage was removed Perspective view showing the periphery of the nose part (A) (b) is a cross-sectional view of a contact nose showing the form of a protrusion, respectively. Is a longitudinal sectional view showing a state in which the inclination of the nail is suppressed by the protrusion. Longitudinal cross-sectional view showing the contact state between the contact nose and the nose Vertical section showing the degree of inclination of the nail (A) is a longitudinal cross-sectional view of another form of a contact nose, (b) is a cross-sectional view on the XX line of (a) (A) is a longitudinal cross-sectional view which shows the fitting state of the said contact nose and a nose part, (b) is sectional drawing on the YY line of (a).

  Hereinafter, one embodiment of an impact tool of the present invention will be described with reference to FIGS.

  In FIG. 1, symbol A indicates a nailing machine. The nailing machine A is provided with a grip 2 at the rear part of the body 1 and a nose part 3 having an injection port at the lower part of the body 1, and a magazine 4 for supplying nails to the injection port at the rear part of the nose part 3. A striking mechanism is provided in the body 1. That is, the striking piston 6 is slidably accommodated in the striking cylinder 5. A driver 7 is integrally coupled and fixed to the lower portion of the striking piston 6, and the driver 7 is configured to slide in the injection port of the nose portion 3.

  The body 1 is formed with an air chamber 8 for storing compressed air supplied from a compressed air supply source (not shown) such as an air compressor (not shown).

  Further, a cylindrical contact nose 12 is provided on the nose portion 3 driving side. The contact nose 12 constitutes a part of a known safety device, and is slidable in the nail driving direction along the nose portion 3, and always protrudes downward from the tip of the nose portion 3. Is spring-biased. When the contact nose 12 is linked to the trigger lever 11 and protrudes from the nose portion 3, the operation of the trigger lever 11 is disabled and the nail driver is not activated even if the trigger lever 11 is operated. ing. On the other hand, by pressing the contact nose 12 against the workpiece, when the contact nose 12 slides along the nose portion 3 against the biasing direction (the direction opposite to the nail driving direction), The pulling operation of the trigger lever 11 is effective. When the sliding amount of the contact nose 12 is insufficient, the safety device is not released and the operation of the trigger lever 11 is not effective.

  A magazine 4 is disposed below the grip 2. The magazine 4 is loaded with a connection nail (not shown) which is one form of a connection fastener, and the leading nail is supplied to the front nose portion 3 through the nail supply passage 13.

  Next, a part of the side wall of the nose portion 3 is opened, and the nail supply passage 13 disposed between the nose portion 3 and the magazine 4 is opened.

  As shown in FIG. 2, the upper part of the side wall facing the magazine 4 side of the contact nose 12 is cut out to form a guide groove 14. The guide groove 14 is formed toward the nail supply passage 13 side, and picks up the tip of the nail punched out from the nose part 3 into the injection port 9 of the nose part 3 and the contact nose 12. The upper side of the guide groove 14 and the injection port 9 side are opened, the groove bottom 15 is formed obliquely, and the nail supply path 13 side of both side walls 16 is cut out in an L shape.

  Next, when starting the nailing machine, the contact nose 12 is pressed against the material to be driven and moved to the opposite side of the nail driving direction, and then the trigger lever 11 is pulled to operate the start valve 10a. The valve 10b opens and the compressed air in the air chamber 8 is supplied to the upper surface of the striking piston 6 in the striking cylinder 5, whereby the striking piston 6 and the driver 7 are driven downward, and the nose portion 3 from the magazine 4 is driven. A nail (not shown) supplied to the container is driven out.

  By the way, as described above, the upper side of the guide groove 14 and the injection port side of the contact nose 12 are opened to the nail supply path 13 side, and the groove bottom 15 is formed obliquely. As shown in FIG. 3A, the groove width of the guide groove 14 is formed to be slightly smaller than the diameter of the nail head N1. And the protrusion 16 which protrudes in the injection port side along the both sides of the opening end of the guide groove 14 is formed. FIG. 2B shows another embodiment of the protrusion 16.

  According to the above configuration, the nail in the magazine 4 is supplied to the injection port 9 of the nose portion 3 through the nail supply passage 13 and is then struck by the driver 7 as shown in FIG. When the foot is driven to tilt backward, the guide groove 14 guides the foot to return to the injection port. However, when hit by the driver 7, the head N <b> 1 of the nail N may be inclined to enter the inside of the guide groove 14. However, since the protrusion 16 is formed in the opening of the guide groove 14, the head N1 of the nail N is engaged with the protrusion 16 and is held so as not to tilt further.

  The protrusion 16 is formed to be inclined within an angle α (for example, 10 to 15 °) at which the nail N will be inclined without the guide groove 14 in the injection port. That is, as indicated by the dotted line, the head N1 of the nail N is formed so as to be inclined at the same or smaller angle than the state where it is engaged with the virtual inner wall surface that would have been without the guide groove 14 and inclined. Has been. In short, the angle at which the head N1 of the nail N is engaged with the protrusion 16 is kept below the inclination when the nail N hits the opposite side wall of the guide groove 14 at the same height position. preferable.

  As described above, even if the nail N is inclined toward the guide groove 14, the area where the tip surface of the driver 7 contacts the head N 1 of the nail N is the same as or larger than the case where there is no guide groove 14. The nail shaft does not tilt more than necessary. Therefore, as shown in FIGS. 3 and 4, the driver 7 strikes the portion corresponding to the axis N <b> 2 of the nail N, so that the nail N can be driven well and reliably. On the other hand, when the protrusion 16 is not formed in the opening of the guide groove 14, the nail N is greatly inclined, so that the area where the tip surface of the driver 7 hits the head N1 of the nail N is very small. Since there is a possibility of hitting only the edge of the head N1 that protrudes from the nail axis N2, there is a possibility that the edge will bend and hit the side of the axis N2, and the nail N will be bent in the middle and buckled, Inconvenience of clogging occurs.

  Further, by forming the guide groove 14 in the contact nose 12, the overall height of the nailing machine can be kept low.

  Next, the inner diameter of the tip of the contact nose 12 is substantially the same as the inner diameter of the nose portion 3, but the inner diameter of the base portion of the contact nose 12 is the same as or slightly larger than the outer diameter of the nose portion 3. It is formed as follows. In the contact nose 12, as shown in FIG. 5, an inner peripheral surface 20 between the base large-diameter portion 17 and the tip small-diameter portion 18 is formed as a tapered surface. Corresponding to this, the outer peripheral surface 21 on the distal end side of the nose portion 3 is also formed as a tapered surface having the same inclination angle as the inner peripheral surface 20.

  According to the above configuration, as shown in FIG. 6, even if the nail N falls into the contact nose 12 with the contact nose 12 away from the nose portion 3 before the contact nose 12 is pressed against the workpiece, Since the angle of the inner peripheral surface 20 of the contact nose 12 is small, the inclination of the nail N is also small, and therefore the posture of the nail N is not disturbed. When the nail N is driven, the contact nose 12 is pressed against the material to be driven, so that the contact nose 12 is pushed into the nose portion 3 side and slides to fit the nose portion 3 as shown in FIG. At that time, the outer peripheral surface 21 of the base portion of the nose portion 3 overlaps the inner peripheral surface 20 on the distal end side of the contact nose 12.

  Therefore, the outer peripheral surface 21 and the inner peripheral surface 20 are not galvanized, and the contact nose 12 is smoothly separated from the nose portion 3 after nailing. In addition, since the overlapping surface of the nose portion 3 and the contact nose 12 is increased and the fitting depth is increased as compared with the case where the tip side of the nose portion 3 does not have a tapered surface, the overall height of the nail driver is kept low. be able to.

  Further, since the gap S between the nose portion 3 and the contact nose 12 is reduced and the inclination angle of the inner peripheral surface 20 of the contact nose 12 can be reduced, the head of the nail is caught by the taper surface during driving. The inconvenience is eliminated and the nail can be driven well and reliably.

  FIGS. 7A, 7B and 8A, 8B show other embodiments, and the inner peripheral surface 22 of the intermediate portion of the contact nose 12 and the vicinity thereof are arranged in the circumferential direction. A plurality of protrusions 23 having a tapered surface with a small inclination angle are formed at regular intervals along the surface. The interval between the adjacent ridges 23 is smaller than the diameter of the head N1 of the nail N, and when the head N1 engages with the ridges 23, it floats from the inner peripheral surface and suppresses the inclination of the entire nail N to be small. It is formed so that it can be.

  Further, as shown in FIGS. 8A and 8B, the inclination angle β of the inner surface 22a of the protrusion 23 is substantially the same as the inclination angle of the inner peripheral surface 22 of the contact nose 12 shown in FIG. The inclination angle of the inner peripheral surface 22 is set to be larger than that. For example, the inclination angle of the inner peripheral surface 22 may be 20 to 30 °, and the inclination angle of the inner surface 22a of the ridge 23 may be about 10 to 15 °.

  On the other hand, an avoidance portion 25 that avoids interference with the protrusion 23 of the contact nose 12 is formed on the outer peripheral surface 24 on the distal end side of the nose portion 3. The avoiding portion 25 may be formed in a slit shape or a groove shape.

  According to the above configuration, even if the nail falls into the contact nose 12 in a state where the contact nose 12 is separated from the nose portion 3 before the contact nose 12 is pressed against the workpiece, the contact nose with which the head is engaged Since the inclination angle of the protrusions 23 on the inner peripheral surface 12 is small, the inclination of the nail is also reduced, and therefore the nail posture is not disturbed. The inconvenience that the head is caught on the inner peripheral surface is eliminated, and the nail can be driven well and reliably.

  Further, when the nail is driven, when the contact nose 12 is pressed against the material to be driven and the contact nose 12 is pushed and slid toward the nose portion 3 side, and the base of the contact nose 12 is fitted to the nose portion 3, The protrusion 23 at the base portion of the contact nose 12 is accommodated in the avoidance portion 25 on the distal end side of the nose portion 3. Therefore, since the depth of the overlapping portion between the nose portion 3 and the contact nose 12 can be increased, the overall height of the nailing machine can be kept low.

  In addition, although the said embodiment is a nailing machine, this invention is not limited to a nailing machine. The present invention can be applied to an impact tool for driving a nail such as a nail, a driving screw, or a staple impactingly using air pressure, gas pressure or the like as a drive source.

N Nail 3 Nose 12 Contact Nose 14 Guide Groove 16 Projection 23 Projection

Claims (4)

In an impact tool provided with a contact nose for guiding a fastener that has been slidable along the driving direction on the side of the nose where the fastener supplied from the magazine through the fastener supply passage is driven out by a striking mechanism, A guide groove is formed by cutting out the upper portion of the side wall facing the magazine side of the contact nose and picking up the leg tip of the fastener punched from the nose portion into the injection port of the nose portion toward the fastener supply passage side. An impact tool characterized in that a projecting portion is formed at the opening end of the groove so as to protrude to the injection port side so as to engage with the head portion of the fastener and hold the fastener so as not to be inclined more than necessary.   The angle when the head of the fastener is engaged with the protrusion is set to be equal to or less than an inclination when the fastener hits a side wall on the opposite side of the guide groove at the same height position. Item 2. The impact tool according to Item 1. In an impact tool provided with a contact nose for guiding a fastener that has been slidable along the driving direction on the side of the nose where the fastener supplied from the magazine through the fastener supply passage is driven out by a striking mechanism,
The inner diameter at the tip side of the contact nose is substantially the same as the inner diameter of the nose part, and the inner diameter at the base side of the contact nose is formed to be the same as or slightly larger than the outer diameter of the nose part. The inner peripheral surface and the outer peripheral surface on the tip end side of the nose portion are formed as a tapered surface with the same inclination angle, and when the fastener is driven, the contact nose slides and fits inside the nose portion. An impact tool characterized in that the outer peripheral surface of the base portion of the base portion overlaps the inner peripheral surface on the tip side of the nose portion.   A plurality of protrusions having tapered surfaces having a smaller inclination angle than the inner peripheral surface are formed at equal intervals on the inner peripheral surface of the intermediate portion of the contact nose and in the vicinity thereof at regular intervals along the circumferential direction. The impact tool according to claim 3, wherein an avoidance portion for avoiding interference with the protrusion of the contact nose is formed on an outer peripheral surface on a distal end side of the nose portion.

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