JP6638259B2 - Driving tool - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving tool in which a contact member is detachably provided at a tip for driving a fastener.

  2. Description of the Related Art There is known a driving tool in which a contact member is detachably provided at a tip portion for driving a fastener. For example, Patent Document 1 discloses a nail driver in which nails having different diameters can be used by replacing a contact nose. In the configuration described in Patent Document 1, a concave portion for connection is formed in an upper portion of the contact nose and a lower portion of the contact arm, and the concave portion of the contact nose is pushed into the elastic body fitted in the concave portion of the contact arm and fitted. By doing so, the contact nose is connected and held to the contact arm via the elastic body.

JP 2007-203419 A

  However, the configuration described in Patent Literature 1 described above has a problem that stress concentration is likely to occur in a recess for fitting an elastic body. For this reason, when an impact is applied to the contact nose, parts may be damaged. For example, the fastener may hit the inner peripheral surface of the contact nose when the fastener is launched, and a lateral impact may be applied to the contact nose. Since such a shock generates a bending moment in a range straddling the concave portion of the joint portion, stress concentration occurs in the concave portion, and there is a possibility that the connection portion of the contact nose may be damaged.

  In view of the above, an object of the present invention is to provide a driving tool in which a contact member is detachably provided at a distal end portion at which a fastener is punched out, and the detachable portion is hardly damaged even when a contact nose receives an impact.

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

The invention according to claim 1 includes a housing, a contact portion attached to a distal end portion of the housing, and an arm portion provided to be vertically movable with respect to the housing , wherein the contact portion includes a rod-shaped portion. The rod-shaped part is attached to and detached from the insertion-fixed part by a mounting structure including an insertion fixing part into which the rod-shaped part is inserted, and a fixing member fixing the fitted state of the rod-shaped part and the insertion fixing part. By fixing the clearance width, which is detachably attached to the arm portion and formed between the outer peripheral surface of the rod portion and the inner peripheral surface of the insertion fixing portion, in the axial direction of the rod portion, It is formed differently on both sides sandwiching the member, and when the facing area of the rod-shaped portion and the insertion fixing portion is compared on both sides sandwiching the fixing member when viewed in the axial direction of the rod-shaped portion, the facing The smaller area Characterized in that to increase the clearance width.

  According to a second aspect of the present invention, in addition to the features of the first aspect of the present invention, a peripheral groove which engages with the fixing member is provided on an outer periphery of the rod-shaped portion.

According to a third aspect of the present invention, in addition to the features of the first or second aspect of the present invention, the clearance width is viewed in the axial direction of the rod-shaped portion by changing the inner diameter of the insertion fixing portion. The fixing member is formed differently on both sides of the fixing member.

According to a fourth aspect of the present invention, in addition to the features of the first or second aspect, the clearance width is viewed in the axial direction of the rod by changing the outer diameter of the rod. The fixing member is formed differently on both sides of the fixing member.

  The present invention is as described above, and the contact portion includes a rod-shaped portion, an insertion fixing portion into which the rod-shaped portion is inserted, and a fixing member that fixes a fitting state between the rod-shaped portion and the insertion fixing portion. The clearance width formed between the outer peripheral surface of the rod-shaped portion and the inner peripheral surface of the insertion fixing portion, which is attached to the front end portion of the housing by the attached mounting structure, is different on both sides of the fixing member. Formed. According to such a configuration, even if a force is generated such that the rod-shaped portion tilts inside the insertion fixing portion when the contact portion receives an impact, the load is applied only to the outer periphery of the portion where the clearance width is small. In addition, a load is hardly applied to the outer periphery of the portion where the clearance width is large. That is, since a bending moment hardly occurs at two points sandwiching the circumferential groove, it is possible to avoid a problem that stress concentration occurs in the circumferential groove portion and the connection portion is damaged.

It is an external appearance perspective view of a driving tool. It is sectional drawing which looked at the driving tool from the side. It is sectional drawing which looked at the driving tool from the front, and is the figure in the state where the contact part was not pushed up. It is sectional drawing which looked at the driving tool from the front, and is the figure in the state where the contact part was pushed up. FIG. 2A is a partially enlarged cross-sectional view near a connection portion of a contact portion, and FIG. 2B is a diagram in which a part of FIG. FIG. 10 is a partially enlarged cross-sectional view of the vicinity of a connection portion of a contact portion according to Modification 1. (A) is a partially enlarged cross-sectional view of the vicinity of a connection portion of a contact portion according to Modification Example 2, and (b) is a diagram in which a part of (a) is further enlarged. (A) is a partially enlarged cross-sectional view of the vicinity of a connection portion of a contact portion according to Modification Example 3, and (b) is a diagram in which a part of (a) is further enlarged. (A) is a partially enlarged sectional view of the vicinity of a connection portion of a contact portion according to Modification 4, and (b) is a diagram in which a part of (a) is further enlarged. 18 is an external perspective view of the vicinity of a connection portion of a contact portion according to Modification Example 5. FIG. (A) is a partially enlarged cross-sectional view of the vicinity of a connection portion of a contact portion according to Modification Example 5, and (b) is a diagram in which a part of (a) is further enlarged.

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

  The driving tool 10 according to the present embodiment is a pneumatic driving tool 10 for driving a fastener using compressed air. As shown in FIGS. 1 and 2, a tool body 11 having a nose portion 13 and a nose A magazine 19 connected to the tool body 11 on the side of the portion 13.

  The tool main body 11 is configured such that a body housing 12 and a grip housing 16 are provided continuously at a substantially right angle. A striking cylinder 31 is arranged inside the body housing 12, and a striking piston 32 is slidably accommodated in the striking cylinder 31. A driver for striking the fastener is provided on the lower surface of the striking piston 32 so that the driver can strike the fastener when the striking piston 32 operates. The compressed air used for driving the fastener is supplied from an external device such as an air compressor. These external devices are connected to an end cap portion 18 provided at the rear end of the grip housing 16. The compressed air supplied from the external device passes through the inside of the grip housing 16 and is supplied to the striking cylinder 31.

  A nose portion 13 for injecting a fastener is integrally connected to a lower end of the body housing 12, and the body housing 12 and the nose portion 13 form a body portion 33. The aforementioned driver is slidably guided in the direction of the nose portion 13. Note that a fastener supply mechanism is provided behind the nose portion 13. This fastener supply mechanism performs a feeding operation in conjunction with a driving operation. By this feeding operation, the fasteners stored in the magazine 19 are sequentially sent to the nose portion 13.

  At the tip of the nose portion 13, a contact portion 14 is disposed so as to be vertically movable with respect to the nose portion 13 and pressed against the material to be driven. The contact portion 14 is slidably attached to the tip of the nose portion 13. Specifically, a rail-shaped sliding guide portion 13a is provided on the surface of the nose portion 13 so as to protrude. The sliding guide portion 13a extends along the sliding direction of the contact portion 14. On the other hand, the contact portion 14 is formed with an engaging portion 14d that engages with the sliding guide portion 13a. When the engaging portion 14d engages with the sliding guide portion 13a, the contact portion 14 is slidably engaged with the tip of the nose portion 13.

  As shown in FIGS. 3 and 4, the contact portion 14 includes an insertion fixing portion 27 into which a rod portion 22 described later can be inserted. The contact portion 14 is detachable from the nose portion 13 by attaching and detaching the rod portion 22 to and from the insertion fixing portion 27. The insertion fixing part 27 is provided so as to protrude to the side of the contact part 14, and a through hole 27 a for inserting the rod-shaped part 22 is formed so as to penetrate in parallel with the fastener driving direction. A ring-shaped holding groove 27d is formed on the inner peripheral surface of the through hole 27a, and the ring-shaped fixing member 23 is held by the holding groove 27d. The fixing member 23 according to the present embodiment is an O-ring formed of an elastic material such as rubber, and the fixing member 23 is compressed in the radial direction and fitted and fixed in the holding groove 27d.

  Further, a peripheral groove 22a is formed near the lower end of the rod-shaped portion 22 inserted into the insertion fixing portion 27 described above. When the rod portion 22 is inserted into the insertion fixing portion 27, the fixing member 23 is engaged with the peripheral groove 22a, and the contact portion 14 is fixed so as not to fall off from the rod portion 22.

  When attaching the contact portion 14 to the nose portion 13, the lower end of the rod portion 22 is inserted into the through hole 27a of the contact portion 14, and the fixing member 23 is fitted into the circumferential groove 22a by pressing strongly. Conversely, when removing the contact portion 14 from the nose portion 13, the contact portion 14 is pulled out and pulled out of the rod portion 22. By making the contact portion 14 detachable in this way, the contact portion 14 can be replaced according to the purpose of use (diameter of fastener, type of member to be driven, etc.).

  The above-mentioned bar-shaped part 22 is fixed to an arm part 24 which constitutes a safety device for the driving tool 10. The arm 24 has a first joint 24 a at the front end fixed to the rod 22, and a second joint 24 b at the rear end fixed to an arm connection 25 b of the driving depth adjusting mechanism 25.

  The driving depth adjusting mechanism 25 is for adjusting the driving depth of the fastener. The driving depth adjusting mechanism 25 includes a knob 25a. When the knob 25a is operated, the arm 24 moves up or down in accordance with the operation direction. When the arm 24 moves up and down, the contact 14 connected to the arm 24 also moves up and down at the same time. By moving the initial position of the contact portion 14 up and down in this way, the depth at which the fastener is driven can be adjusted.

  A safety mechanism for the driving tool 10 is provided near the driving depth adjusting mechanism 25. As shown in FIG. 3, the safety mechanism does not strike the fastener even when the trigger 17 is operated when the arm 24 is not moved upward. As shown in FIG. 4, when the contact portion 14 is pressed against the material to be driven and the arm portion 24 moves upward integrally, the safety mechanism detects the upward movement of the arm portion 24 and operates the trigger 17. Is formed to be effective.

  When the trigger 17 is operated while the contact portion 14 is pressed against the material to be driven (or when the contact portion 14 is pressed against the material to be driven while the trigger 17 is being operated), the compressed air supplied from the external device is supplied to the impact cylinder 31. And the compressed air acts on the striking piston 32 to drive the striking piston 32. When the striking piston 32 is driven, the driver coupled to the striking piston 32 strikes the leading fastener, and the fastener is launched.

  In addition, the ejection port 15 from which the fastener is punched out is formed at the tip of the contact portion 14, and the inner peripheral surface of the contact portion 14 up to the ejection port 15 forms an ejection path of the fastener. When the fastener is driven, the driver and the fastener are guided in a stable manner by the inner peripheral surface of the contact portion 14.

  By the way, as described above, the contact portion 14 according to the present embodiment is formed detachably with respect to the nose portion 13. When the contact portion 14 is attached to the nose portion 13, as shown in FIG. 5A, the fixing member 23 is engaged with the peripheral groove 22 a of the rod portion 22, and the contact portion 14 is prevented from dropping.

  Here, in the present embodiment, as shown in FIG. 5B, the through hole 27a of the insertion fixing portion 27 is formed such that the inner diameter is different between the upper side and the lower side with the holding groove 27d interposed therebetween. . Specifically, the upper inner peripheral surface 27b provided above the holding groove 27d is formed to have a smaller diameter than the lower inner peripheral surface 27c provided below the holding groove 27d. For this reason, the clearance width formed between the outer peripheral surface of the rod-shaped portion 22 and the inner peripheral surface of the insertion fixing portion 27 is formed so as to be different on the upper and lower sides of the peripheral groove 22a of the rod-shaped portion 22. . In the present embodiment, the clearance is set so that there is almost no clearance between the outer peripheral surface of the rod portion 22 and the upper inner peripheral surface 27b of the insertion fixing portion 27. A clearance having a predetermined width W is provided between the fixed portion 27 and the lower inner peripheral surface 27c.

  For this reason, an impact that tilts the nose portion 13 is generated, and even when the rod-shaped portion 22 is relatively tilted inside the through hole 27a of the insertion fixing portion 27, the upper inner peripheral surface 27b Is in contact with the rod-shaped part 22 to restrict the inclination of the rod-shaped part 22, so that the rod-shaped part 22 hardly comes into contact with the lower inner peripheral surface 27c. In other words, since no load is applied to the distal end side of the peripheral groove 22a of the rod-shaped portion 22, no bending moment is generated at two points sandwiching the peripheral groove 22a. Therefore, the problem that stress concentration occurs in the portion of the peripheral groove 22a and the rod portion 22 is broken hardly occurs.

  When the clearance width is set to be different as described above, it is desirable to increase the clearance width where the area where the inner peripheral surface of the insertion fixing portion 27 faces the outer peripheral surface of the rod portion 22 (opposed area) is smaller. . The magnitude of the facing area is generally defined by the length of the overlap between the insertion fixing portion 27 and the rod portion 22 when viewed in the axial direction of the rod portion 22. That is, if the length where the insertion fixing part 27 and the rod-shaped part 22 overlap is long, the opposing area becomes large, and if the length where the insertion fixing part 27 and the rod-shaped part 22 overlap is short, the opposing area becomes small. In the present embodiment, the area of the lower inner peripheral surface 27c is smaller than that of the upper inner peripheral surface 27b, and the area facing the outer peripheral surface of the rod 22 (opposed area) is also smaller. Therefore, it is desirable to make the clearance width between the lower inner peripheral surface 27c and the outer peripheral surface of the rod-shaped portion 22 larger than the clearance width between the upper inner peripheral surface 27b and the outer peripheral surface of the rod-shaped portion 22. With this configuration, even when a force that inclines the rod-shaped portion 22 is exerted, the effect of suppressing the inclination of the rod-shaped portion 22 can be easily obtained. There is no.

  As described above, according to the present embodiment, the mounting structure of the contact part 14 includes the rod-shaped part 22 having the peripheral groove 22a formed on the outer periphery, the insertion fixing part 27 into which the rod-shaped part 22 is inserted and fixed, A ring-shaped fixing member 23 that engages with the peripheral groove 22a. The clearance width formed between the outer peripheral surface of the rod portion 22 and the inner peripheral surface of the insertion fixing portion 27 is reduced by the peripheral groove 22a. Was formed differently on both sides sandwiching. According to such a configuration, even when a force is generated such that the rod-shaped portion 22 is inclined inside the insertion fixing portion 27 when the contact portion 14 receives an impact, the load is applied only to the outer peripheral portion having a small clearance width. As a result, a load is hardly applied to the outer peripheral portion having a large clearance width. That is, since a bending moment is hardly generated at two points sandwiching the circumferential groove 22a, it is possible to avoid a problem that stress concentration occurs in the portion of the circumferential groove 22a and the connection portion is damaged.

  In this embodiment, the shape of the peripheral groove 22a is vertically asymmetric as shown in FIG. Specifically, the edge of the peripheral groove 22a on which the fixing member 23 is pressed when the contact portion 14 is to be removed from the nose portion 13 is defined as a first edge 22b, and the edge of the opposite peripheral groove 22a is defined as a first edge 22b. When the portion is the second edge 22c, the second edge 22c is formed in a shape that is gentler than the first edge 22b. In the present embodiment, the second edge 22c is formed in an R shape having a larger radius of curvature than the first edge 22b. Further, the second inclined surface 22e leading to the second edge 22c has a tapered shape in which the inclination angle with respect to the axis of the rod-shaped portion 22 is smaller than the first inclined surface 22d leading to the first edge 22b. I have.

  If the second edge 22c is formed in a shape that is gentler than the first edge 22b in this manner, even if the fixing member 23 is pressed against the second edge 22c, the fixing member 23 may be pressed against the second edge 22c. Since it is difficult to bite, the fixing member 23 is not easily damaged. On the other hand, the edge (first edge 22b) in the falling direction is not smooth, and the fixing member 23 does not easily come off from the circumferential groove 22a. Therefore, it is possible to achieve both the purpose of preventing the detachment and the damage of the fixing member 23.

  The method for preventing the damage of the fixing member 23 is not limited to the method of making the shape of the circumferential groove 22a vertically asymmetric as described above, and a method as shown in FIG. 6 may be adopted. In the method shown in FIG. 6, when the contact portion 14 is attached to the nose portion 13, the fixing member 23 is engaged below the peripheral groove 22a, and a space larger than the lower side is formed above the fixing member 23. It has become so. In this way, if the peripheral groove 22a extends on the side opposite to the pull-out direction, the fixing member 23 is less likely to contact the second edge portion 22c, so that the fixing member 23 can be prevented from being damaged. . On the other hand, since the fixing member 23 is securely hooked on the edge (first edge 22b) in the dropping direction, it is possible to achieve both the purpose of preventing the detachment and the damage of the fixing member 23.

  Further, in the above-described embodiment, the rod portion 22 is fixed to the arm portion 24 side, and the insertion fixing portion 27 is provided on the contact portion 14. However, the embodiment of the present invention is not limited to this.

  For example, as shown in FIG. 7, the insertion fixing portion 27 may be provided on the arm portion 24 side, and the bar portion 22 may be provided on the contact portion 14. In the example shown in FIG. 7, an insertion fixing part 27 is provided at the tip of the arm part 24, and the rod part 22 is integrally formed on the side part of the contact part 14. Also in such a form, by making the clearance width formed between the rod-shaped portion 22 and the insertion fixing portion 27 different on both sides of the peripheral groove 22a, stress concentration occurs on the peripheral groove 22a. The problems that occur can be avoided.

  As shown in FIG. 8, the through hole 27a of the insertion fixing portion 27 is formed in a stepped hole shape, and the fixing member 23 is engaged with the step between the upper inner peripheral surface 27b and the lower inner peripheral surface 27c. You may. Even when the holding groove 27d is not formed as described above, the clearance width formed between the rod-shaped portion 22 and the insertion fixing portion 27 is made different on both sides of the circumferential groove 22a, so that the circumferential groove 22a is formed. It is possible to avoid a problem that stress concentration occurs in a portion.

  As shown in FIG. 9, an insertion fixing portion 27 is provided at the tip of the arm portion 24, the rod portion 22 is integrally formed on the side of the contact portion 14. The fixing member 23 may be formed in a shape, and the fixing member 23 is engaged with a step between the upper inner peripheral surface 27b and the lower inner peripheral surface 27c. Also in such a form, by making the clearance width formed between the rod-shaped portion 22 and the insertion fixing portion 27 different on both sides of the peripheral groove 22a, stress concentration occurs on the peripheral groove 22a. The problems that occur can be avoided.

  Further, as shown in FIGS. 10 and 11, the present invention may be applied to a structure in which the cylindrical portion of the contact portion 14 forming the injection port 15 is inserted into the opening at the tip of the nose portion 13. In this case, since the cylindrical portion of the contact portion 14 plays the role of the rod portion 22, a circumferential groove 22a is formed around the cylindrical portion. The opening at the tip of the nose portion 13 plays the role of the insertion fixing portion 27. Also in such a form, by making the clearance width formed between the rod-shaped portion 22 and the insertion fixing portion 27 different on both sides of the peripheral groove 22a, stress concentration occurs on the peripheral groove 22a. The problems that occur can be avoided.

  In the above-described embodiment, the inner diameter of the through hole 27a of the insertion fixing portion 27 is made different on both sides of the holding groove 27d, so that the clearance width is made different on both sides sandwiching the peripheral groove 22a. However, the embodiment of the present invention is not limited to this. By making the outer diameter of the rod-shaped portion 22 different on both sides of the peripheral groove 22a, the clearance width may be different on both sides sandwiching the peripheral groove 22a. Good.

DESCRIPTION OF SYMBOLS 10 Driving tool 11 Tool main body 12 Body housing 13 Nose part 13a Sliding guide part 14 Contact part 14d Engagement part 15 Injection port 16 Grip housing 17 Trigger 18 End cap part 19 Magazine 22 Rod part 22a Peripheral groove 22b First edge 22c Second edge 22d First inclined surface 22e Second inclined surface 23 Fixing member 24 Arm 24a First joint 24b Second joint 25 Driving depth adjustment mechanism 25a Knob 25b Arm connection 27 Insertion fixing part 27a Through hole 27b Upper inner peripheral surface 27c Lower inner peripheral surface 27d Holding groove 31 Striking cylinder 32 Striking piston 33 Body W Clearance width

Claims (4)

A housing,
A contact portion attached to a tip portion of the housing,
An arm portion movably provided with respect to the housing,
With
The contact portion includes a rod-shaped portion, an insertion fixing portion into which the rod-shaped portion is inserted, and a fixing member that fixes a fitted state between the rod-shaped portion and the insertion fixing portion, the insertion structure includes: By attaching and detaching the rod-shaped part to and from the fixed part, it is detachably attached to the arm part ,
A clearance width formed between the outer peripheral surface of the rod portion and the inner peripheral surface of the insertion fixing portion is formed to be different on both sides of the fixing member when viewed in the axial direction of the rod portion ,
When the opposing area of the rod-shaped part and the insertion fixing part is compared on both sides of the fixing member when viewed in the axial direction of the rod-shaped part, the clearance width of the smaller opposing area is increased. Driving tool, characterized.   The driving tool according to claim 1, wherein a peripheral groove that engages with the fixing member is provided on an outer periphery of the rod-shaped portion. Wherein by changing the inner diameter of the insertion fixing portion, characterized in that the clearance width was viewed in the axial direction of the rod-shaped portion formed differently in both sides of the fixing member, according to claim 1 or 2 The driving tool described. By changing the outer diameter of the rod-like portion, characterized in that the clearance width, were viewed in the axial direction of the rod-shaped portion formed differently in both sides of the fixing member, according to claim 1 or 2 The driving tool described.

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