JP6244695B2 - Fastener driving tool - Google Patents

Description

  The present invention relates to a fastener driving tool provided with a contact nose formed so as to drive a fastener from an injection port at a tip.

  In the conventional fastener driving tool, when a fastener having a small head diameter / wire diameter and a short length is used, the inclination angle of the fastener at the time of driving in the injection port becomes large, and the occurrence frequency of buckling tends to increase.

  Conventionally, a contact nose has been used to suppress the occurrence of such buckling (see, for example, Patent Document 1). The contact nose is a member that is connected to the tip of the contact arm that constitutes the safety device of the fastener driving tool. By pressing this contact nose against the surface of the material to be driven, the contact arm moves up and the striking mechanism can be driven. It becomes a state. By forming the inner diameter of the contact nose to be substantially equal to the inner diameter of the nose portion, the posture can be guided so that the contact nose does not tilt the fastener. In addition, this contact nose protrudes from the nose part when the fastener is driven, contacts the material to be driven, and is formed so that the fastener is driven out from the injection port at the tip. Thus, the posture of the fastener can be guided to the end even when the nose portion is floating. That is, even when a fastener having a small head diameter / wire diameter and a short length is used, the inclination angle of the fastener in the contact nose does not increase, so that the occurrence frequency of buckling can be suppressed.

JP 2007-203419 A

  By the way, this type of fastener driving tool often supports a plurality of types of fasteners having different head diameters and wire diameters. For this reason, even when a contact nose structure is used, the inner diameter of the contact nose needs to be formed to match the maximum diameter of the fastener that can be used. The inclination of the fastener in the inside cannot be completely suppressed. For this reason, there was a possibility that the fastener was tilted and fired, and the fastener buckled.

  In particular, when the fastener supply path is offset with respect to the center position of the injection port, the fastener's foot enters the contact nose from an oblique direction. There is a possibility of being driven while rotating along the inner peripheral surface of the contact nose, and there is a possibility that the direction of the tip of the foot becomes unstable and the fastener buckles.

  Then, this invention makes it a subject to provide the fastener driving tool which can reduce the generation frequency of buckling by suppressing the inclination of the fastener in a contact nose than before.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.
That is, the fastener driving tool according to claim 1 is a fastener driving tool in which a contact nose is slidably provided at a tip of a nose portion for driving the fastener, and the contact nose is substantially equal to an inner diameter of the nose portion. A tubular injection path that is formed with an equal inner diameter and guides the posture of the fastener is formed as a single member, protrudes from the nose portion when the fastener is driven, contacts the driven material, and the fastener is driven out from the injection port at the tip. A guide groove for guiding the tip of the fastener is provided in the inner periphery of the injection path of the contact nose along the launch direction of the fastener, and the guide groove Further, the present invention is characterized in that it is formed with a width smaller than the diameter of the head of the fastener .

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.
That is, the guide groove is formed on the inner surface on the opposite side as viewed from the grip.

(Claim 3)
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 1 or 2.

  That is, the guide groove is formed shallower than the diameter of the shaft portion of the fastener.

(Claim 4 )
The invention described in claim 4 is characterized by the following points in addition to the features of the invention described in any one of claims 1 to 3 .
That is, a supply path for supplying fasteners is connected to the nose part, the supply path is disposed offset from the center position of the injection port, and the guide groove is It is characterized by being inclined with respect to the launching direction of the fastener.

(Claim 5 )
The invention described in claim 5 is characterized by the following points.
That is, the fastener driving tool according to claim 5 is a fastener driving tool in which a contact nose is slidably provided at a tip of a nose portion for driving the fastener, and the contact nose is substantially equal to an inner diameter of the nose portion. A tubular injection path that is formed with an equal inner diameter and guides the posture of the fastener is formed as a single member, protrudes from the nose portion when the fastener is driven, contacts the driven material, and the fastener is driven out from the injection port at the tip. A plurality of guide grooves for guiding the tip of the fastener are provided along the launch direction of the fastener on the inner periphery of the injection path of the contact nose, is provided in the vicinity located as seen in the circumferential direction of the inner periphery of the contact nose, said guide groove, fa Characterized in that it is formed in a width smaller than the diameter of the toner of the head.

(Claim 6 )
The invention described in claim 6 is characterized by the following points.
That is, the fastener driving tool according to claim 6 is a fastener driving tool in which a contact nose is slidably provided at the tip of a nose portion for fastener driving, and the contact nose is substantially the same as the inner diameter of the nose portion. A tubular injection path that is formed with an equal inner diameter and guides the posture of the fastener is formed as a single member, protrudes from the nose portion when the fastener is driven, contacts the driven material, and the fastener is driven out from the injection port at the tip. The guide nose has a guide groove for guiding the tip of the fastener and a second groove formed shallower than the guide groove on the inner periphery of the injection path of the contact nose. It is provided along the launch direction, the guide groove, of forming a smaller width than the diameter of the head of the fastener And wherein the are.

  The invention according to claim 1 is as described above, and since one guide groove for guiding the tip of the fastener is provided in the inner periphery of the contact nose along the launch direction of the fastener. Because the tip of the fastener fired from the nose part is guided to the guide groove, the tip of the fastener does not swing in the left-right direction within the contact nose. And the occurrence frequency of buckling can be reduced.

In particular, when the supply path connected to the nose portion for supplying the fastener is offset with respect to the center position of the injection port, the tip of the fastener moves from the oblique direction to the inside of the contact nose. Since it enters, there is a possibility that the foot of the fastener is driven out while rotating along the inner peripheral surface of the contact nose, and the direction of the foot tends to become unstable. Even when the supply path is arranged offset with respect to the center position of the injection port in this way, by providing the guide groove, the tip of the rotating fastener can be caught by the guide groove, The direction of the toes can be stabilized, and the buckling frequency can be reduced.
Further, since the guide groove is formed with a width smaller than the diameter of the head portion of the fastener, the head portion of the fastener does not enter the guide groove, so that the inner peripheral surface of the contact nose (the portion other than the guide groove) ) Can be used to reliably guide the fastener head, and the posture of the fastener within the contact nose can be stabilized.

  The invention according to claim 2 is as described above, and the guide groove is formed on the inner surface on the opposite side as viewed from the grip. If the guide groove is provided at such a position, the foot of the fastener that has entered the guide groove is guided in a state of being inclined in the opposite direction as viewed from the grip. When the fastener driving tool tilts in the direction in which the opposite side is lifted as viewed from the grip due to the reaction at the time of launch, the axis of the fastener approaches perpendicular to the surface to be driven. You can drive in.

The invention according to claim 3 is as described above, and the guide groove is formed to be shallower than the diameter of the shaft portion of the fastener, so that the shaft portion of the fastener can enter the guide groove more than necessary. Therefore, there is no problem that the fastener driving position is shifted due to the guide groove.

The invention according to claim 4 is as described above, and a supply path for supplying fasteners is connected to the nose portion, and the supply path is located at a center position of the injection port. The guide groove is formed so as to be inclined with respect to the launching direction of the fastener. According to such a configuration, since the supply path is offset, the fastener foot smoothly enters the fastener rotation direction even when the foot of the fastener enters the contact nose from an oblique direction. Since the toes can be guided, the direction of the toes can be stabilized, and the buckling frequency can be reduced.

The invention according to claim 5 is as described above, and on the inner periphery of the contact nose, a plurality of guide grooves for guiding the tip of the fastener are provided along the launching direction of the fastener, Since the plurality of guide grooves are provided at positions close to each other in the circumferential direction of the inner periphery of the contact nose, when the tip of the fastener enters the inner periphery of the contact nose while rotating, the first 1 Even if the fastener's foot cannot be caught in the main guide groove, the fastener's foot can be caught and guided reliably in the next (second) guide groove, thus stabilizing the direction of the foot. Further, the buckling frequency can be reduced.

The invention according to claim 6 is as described above, and a guide groove for guiding a tip of a fastener is formed on the inner periphery of the contact nose, and a second groove formed shallower than the guide groove. Since the groove is provided along the launch direction of the fastener, the frequency of occurrence of buckling of the fastener can be reduced by the guide groove, and for example, dust in the contact nose is discharged by the second groove. be able to.

It is a side view of a fastener driving tool. It is sectional drawing which looked at the fastener driving tool from the side. It is the partially expanded sectional view which looked at the nose part vicinity from the side. It is the partially expanded sectional view which looked at the front-end | tip of a contact nose from back (grip side). It is sectional drawing which shows a mode that a fastener is guide | induced by the guide groove inside a contact nose. It is a figure which shows a mode that a fastener is struck out, Comprising: (a)-(e) is a partially expanded sectional view which looked at the nose part vicinity from the side surface, (f)-(i) is back (grip side) nose part vicinity. It is a partially expanded sectional view seen from FIG. It is a figure which shows the modification of a contact nose. FIG. 9 is a cross-sectional view showing a state in which a fastener is guided by a guide groove inside a contact nose in a modified example in which the guide groove is inclined. In the conventional contact nose, it is a figure which shows a mode that a fastener is driven out, Comprising: (a)-(e) is the partially expanded sectional view which looked at the nose part vicinity from the side surface, (f)-(i) is a nose part It is the partially expanded sectional view which looked at the vicinity from back (grip side). It is a figure for demonstrating the structure of a contact nose, (a) And (b) is the partially expanded sectional view which looked at the nose part vicinity provided with the contact nose structure from the side, (c) And (d) It is the partially expanded sectional view which looked at the nose part vicinity which is not provided with a contact nose structure from the side surface.

  Embodiments of the present invention will be described with reference to the drawings.

  A fastener driving tool 10 according to the present embodiment is a pneumatic driving tool for driving a fastener 41 using compressed air. As shown in FIG. 1, a tool main body 11 including a nose portion 13, and a nose portion 13. And a magazine 19 connected to the tool body 11 on the side.

  The tool body 11 is configured by a body housing 12 and a grip housing 16 that are connected substantially at a right angle. A striking cylinder is disposed inside the body housing 12, and a striking piston is slidably accommodated in the striking cylinder. A driver 21 for striking the fastener 41 is coupled to the lower surface of the striking piston, and the fastener 41 can be driven by the driver 21 when the striking piston is actuated.

  A nose portion 13 for injecting the fastener 41 is provided at the lower end of the body housing 12, and the driver 21 described above is slidably guided toward the nose portion 13.

  As shown in FIG. 2, a supply path 13 a is provided behind the nose portion 13 for supplying the fastener 41 to the nose portion 13. The supply path 13 a communicates with the inside of the magazine 19, and is formed so that the connecting fastener pulled out from the side portion of the magazine 19 passes through the supply path 13 a and is supplied to the nose portion 13. Note that the magazine 19 stores a connected fastener in which a plurality of fasteners 41 are connected by a connecting material and wound in a coil shape.

  Further, as shown in FIG. 2, the supply path 13 a is provided with a fastener supply mechanism including a feed member 20 that sequentially supplies the fasteners 41 to the nose portion 13. The feed member 20 of this fastener supply mechanism moves forward and backward in conjunction with the driving operation, and uses a feed dog for grasping and feeding the shaft portion 41b of the fastener 41 to use the fastener 41 in the magazine 19. Are sequentially fed into the nose section 13. By the feeding operation of the feeding member 20, the fasteners 41 arranged along the supply path 13 a are sequentially supplied to the launch position of the nose portion 13.

  A substantially cylindrical contact nose 14 is disposed at the tip of the nose portion 13 so as to be movable up and down with respect to the nose portion 13 and pressed against the driven material 40. The contact nose 14 is slidably attached to the tip of the nose portion 13. The contact nose 14 is connected to a contact arm that constitutes a safety device of the fastener driving tool 10. When the contact nose 14 is pressed against the driven material 40 and slides, the contact arm integrally moves up. It has become. When the contact arm moves up, the operation of the trigger 17 is made effective.

  Specifically, when the trigger 17 is operated with the contact nose 14 pressed against the workpiece 40 (or when the contact nose 14 is pressed against the workpiece 40 with the trigger 17 operated), the rear end of the grip housing 16 Compressed air supplied from an air supply source such as an air compressor connected to the end cap portion 18 is supplied into the striking cylinder, and this compressed air acts on the striking piston to drive the striking piston and couple it to the striking piston. The driver 21 hits the front fastener 41.

  At this time, the posture of the driver 21 and the fastener 41 is stably guided by the injection path inside the contact nose 14, and the fastener 41 is driven out from the injection port 15 opened at the tip of the contact nose 14. That is, the substantially cylindrical contact nose 14 is formed with an inner diameter S2 substantially equal to the inner diameter S1 of the injection path 13b of the nose portion 13 as shown in FIGS. 10A and 10B, and guides the posture of the fastener 41. At the same time, when the fastener 41 is driven, it protrudes from the nose portion 13 so as to come into contact with the driven material 40, and the fastener 41 is driven out from the injection port 15 at the tip. For this reason, the posture of the fastener 41 can be guided to the end even in a state where the nose portion 13 is floated by the reaction during driving or adjustment of the driving depth (when the gap S3 shown in FIG. 10B exists). it can. That is, even when the fastener 41 having a short head diameter / wire diameter and a short length is used, the inclination angle of the fastener 41 in the contact nose 14 does not increase, so that the occurrence frequency of buckling can be suppressed. It has become.

  When the contact nose 14 is not provided as in the present embodiment, the inner diameter S2 ′ of the contact member 100 is larger than the inner diameter S1 ′ of the injection path 13b of the nose portion 13 as shown in FIGS. 10 (c) and 10 (d). Is also getting bigger. For this reason, if the nose portion 13 floats due to reaction during driving or adjustment of the driving depth, a gap S3 ′ is generated between the nose portion 13 and the driven material 40, and a fastener is formed in the gap S3 ′. 41 posture cannot be guided. Therefore, the inclination angle of the fastener 41 in the contact nose 14 may be increased, and the occurrence frequency of buckling cannot be suppressed.

  By the way, as shown in FIG. 3, a single guide groove 14 b for guiding the tip of the fastener 41 is provided in the inner periphery 14 a of the contact nose 14 according to the present embodiment along the launch direction of the fastener 41. It has been. The guide groove 14b is formed on the inner surface on the opposite side as viewed from the grip. In addition, as shown in FIG. 4, the guide groove 14b has an introduction portion 14c formed at the start end of the guide groove 14b that is widened so that the fastener 41 can be easily picked up. The straight portion 14d has a narrower shape than the introduction portion 14c.

  By providing such a guide groove 14b, as shown in FIGS. 5 and 6, the foot of the fastener 41 launched from the nose portion 13 is guided to the guide groove 14b, so that the foot of the fastener 41 is Since the contact nose 14 does not swing in the left-right direction, the inclination of the fastener 41 in the contact nose 14 can be suppressed as compared with the conventional case, and the occurrence frequency of buckling can be reduced.

  In particular, as shown in FIG. 5, when the supply path 13 a connected to the nose portion 13 for supplying the fastener 41 is disposed offset with respect to the center position O of the injection port 15, Since the tip of the fastener 41 enters the contact nose 14 from an oblique direction, the tip of the fastener 41 may be driven out while rotating along the inner peripheral surface of the contact nose 14. Tends to be unstable. For this reason, as shown in FIG. 9, the conventional structure has a tendency that the buckling of the fastener 41 is likely to occur. However, if the guide groove 14b is provided as in the present embodiment, even if the supply path 13a is arranged offset with respect to the center position O of the injection port 15, the foot of the rotating fastener 41 is rotated. Since it can be caught by the guide groove 14b, the direction of the toes can be stabilized, and the buckling frequency can be reduced.

  Further, in this embodiment, since the guide groove 14b is formed on the inner surface on the opposite side when viewed from the grip, the tip of the fastener 41 entering the guide groove 14b is inclined in the opposite direction when viewed from the grip. You will be guided. In the case of such a structure, when the fastener driving tool 10 is tilted in the direction in which the opposite side is lifted as viewed from the grip due to the reaction at the time of driving, the axis of the fastener 41 approaches perpendicular to the surface to be driven. The fastener 41 can be driven substantially vertically after being absorbed.

  Further, the guide groove 14b (specifically, the straight portion 14d) according to the present embodiment has a width W (see FIG. 4) smaller than the diameter of the head portion 41a of the fastener 41 (the maximum diameter of the usable head portion 41a of the fastener 41). ), The head 41a of the fastener 41 does not enter the guide groove 14b. Therefore, the head 41a of the fastener 41 is used by using the inner peripheral surface of the contact nose 14 (part other than the guide groove 14b). Can be reliably guided, and the posture of the fastener 41 in the contact nose 14 can be stabilized.

Further, the guide groove 14b according to the present embodiment is formed with a depth D (see FIG. 5) shallower than the diameter of the shaft portion 41b of the fastener 41 (the maximum diameter of the shaft portion 41b of the usable fastener 41). Therefore, the shaft portion 41 b of the fastener 41 does not enter the guide groove 14 b more than necessary, and the driving position of the fastener 41 does not deviate from the injection port 15.
The shape of the guide groove 14b is not limited to the above embodiment.

For example, as shown in FIG. 7A, the guide groove 14 b may be provided only in the straight portion of the contact nose 14 without providing the guide groove 14 b in the tapered portion of the contact nose 14.
Further, as shown in FIG. 7B, the guide groove 14b may not be provided near the injection port 15, or the guide groove 14b may be provided on the grip side.
Further, as shown in FIG. 7C, a guide groove 14b may be provided only in the vicinity of the injection port 15.

  Further, as shown in FIG. 7 (d), the guide groove 14 b may be formed to be inclined with respect to the launch direction of the fastener 41. According to such a configuration, as shown in FIG. 8, even when the foot of the fastener 41 enters while rotating into the contact nose 14 from an oblique direction because the supply path 13 a is offset, the fastener Since the toes of the fastener 41 can be smoothly guided along the rotation direction of the 41, the direction of the toes can be stabilized, and the buckling frequency can be reduced. When the guide groove 14b is inclined, as shown in FIGS. 7D and 8, the upper end of the guide groove 14b (the side opposite to the injection port 15) is offset to the side where the supply path 13a is offset. It is desirable that the lower end (injection port 15 side) of the guide groove 14b be positioned on the opposite side of the grip. If formed in this way, the fastener 41 can be guided without reversing the rotation direction of the fastener 41, and the foot of the fastener 41 at the time of injection is guided in a state inclined in the opposite direction as viewed from the grip, so that When the fastener driving tool 10 is tilted in a direction in which the opposite side is lifted as viewed from the grip due to reaction of time, the axis of the fastener 41 approaches perpendicular to the surface to be driven. Can be typed.

Further, as shown in FIG. 7E, a guide groove 14b may be provided so that the inner peripheral surface 14a of the contact nose 14 continuously decreases from the upper part toward the lower part. The cross section of the inner periphery 14a near the injection port 15 may be substantially circular.
Further, as shown in FIG. 7 (f), a guide groove 14b that continuously narrows from the upper part toward the lower part may be provided.

  Further, the cross section of the guide groove 14b is not limited to the above-described embodiment, but may be a semicircular shape as shown in FIG. 7G, a square groove shape as shown in FIG. ), Or a wide groove as shown in FIG. 7 (j).

  Further, as shown in FIGS. 7 (k) and 7 (l), the number of the guide grooves 14b is not limited to one, but is close to the contact nose 14 in the circumferential direction of the inner periphery 14a (contact nose). A plurality of guide grooves 14b may be provided at positions deviated when viewed in the circumferential direction of the inner circumference 14a. Thus, when the foot of the fastener 41 enters the inner periphery 14a of the contact nose 14 while rotating, the foot of the fastener 41 is caught by the first first guide groove 14b due to the impact of the fastener driving tool 10 or the like. Even if not, since the foot of the fastener 41 can be caught and reliably guided by the next (second) guide groove 14b, the direction of the foot can be stabilized, and the buckling frequency can be further reduced. Can be reduced.

  Further, as shown in FIG. 7 (m), a plurality of grooves having a function of discharging dust, for example, as a second groove are provided on the inner peripheral surface 14a of the contact nose 14, and at least one of the legs of the fastener 41 is provided. You may provide the guide groove 14b which has a function which catches the tip of the fastener 41, when a point | piece enters while rotating. At this time, the guide groove 14b may be formed deeper and wider than the second groove.

DESCRIPTION OF SYMBOLS 10 Fastener driving tool 11 Tool main body 12 Body housing 13 Nose part 13a Supply path 13b Injection path 14 Contact nose 14a Inner circumference 14b Guide groove 14c Introduction part 14d Straight part 15 Injection port 16 Grip housing 17 Trigger 18 End cap part 19 Magazine 20 Feed Member 21 Driver 40 Material to be driven 41 Fastener 41a Head 41b Shaft portion 100 Contact member

Claims (6)

A fastener driving tool in which a contact nose is slidably provided at the tip of a nose portion for driving a fastener,
The contact nose is formed with an inner diameter substantially equal to the inner diameter of the nose portion, and forms a tubular injection path that guides the posture of the fastener as a single member, and protrudes from the nose portion when the fastener is driven. Is formed so that the fastener is driven out from the injection port at the tip,
On the inner periphery of the injection path of the contact nose, a single guide groove for guiding the tip of the fastener is provided along the launch direction of the fastener, and the guide groove is a diameter of the head of the fastener. A fastener driving tool characterized by being formed with a smaller width .   The fastener driving tool according to claim 1, wherein the guide groove is formed on an inner surface on the opposite side as viewed from the grip. The fastener driving tool according to claim 1 or 2 , wherein the guide groove is formed shallower than a diameter of a shaft portion of the fastener. A supply path for supplying fasteners is connected to the nose part.
The supply path is arranged offset with respect to the center position of the injection port,
The fastener driving tool according to any one of claims 1 to 3 , wherein the guide groove is formed to be inclined with respect to a driving direction of the fastener. A fastener driving tool in which a contact nose is slidably provided at the tip of a nose portion for driving a fastener,
The contact nose is formed with an inner diameter substantially equal to the inner diameter of the nose portion, and forms a tubular injection path that guides the posture of the fastener as a single member, and protrudes from the nose portion when the fastener is driven. Is formed so that the fastener is driven out from the injection port at the tip,
On the inner periphery of the injection path of the contact nose, a plurality of guide grooves for guiding the feet of the fastener are provided along the launch direction of the fastener,
The plurality of guide grooves are provided at positions close to each other as viewed in the circumferential direction of the inner periphery of the contact nose, and the guide grooves are formed with a width smaller than the diameter of the head of the fastener. A fastener driving tool. A fastener driving tool in which a contact nose is slidably provided at the tip of a nose portion for driving a fastener,
The contact nose is formed with an inner diameter substantially equal to the inner diameter of the nose portion, and forms a tubular injection path that guides the posture of the fastener as a single member, and protrudes from the nose portion when the fastener is driven. Is formed so that the fastener is driven out from the injection port at the tip,
On the inner periphery of the injection path of the contact nose, a guide groove for guiding the tip of the fastener and a second groove formed shallower than the guide groove are provided along the launch direction of the fastener. The fastener driving tool is characterized in that the guide groove is formed with a width smaller than the diameter of the head of the fastener.

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