JP2007069293A - Anchor driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor driver having a bumper capable of resisting the collision of a piston on an upper part and enhancing the absorption of energy at the time of the collision of the piston on a lower part. <P>SOLUTION: The bumper 11 having an axially extending cylindrical through hole is received in a cylindrical storage part 14 formed of a lower part 25 of a cylinder 2 and an upper part 26 of a nose 10. The bumper has an outer diameter slightly smaller than that of the piston forming an aperture 21 on the upper part 17 of the bumper in contact with the lower surface of the piston, and also has an outer diameter smaller than an inner diameter of the storage part to form a predetermined aperture 27 between the outer periphery of the bumper and the inner periphery of the storage part on the lower part 18 of the bumper adjacent to the upper part of the nose. The bumper has a larger diameter at an intermediate part 19 between the upper part 17 and the lower part 18 than those of the upper and lower parts, and has an outer diameter approximately equal to the inner diameter of the storage part 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic fixing device driving apparatus for hitting and driving a fixing device such as a nail or a staple on an object, and in particular, a fixing device having a bumper for buffering so as to absorb an impact caused by a sudden lowering of a piston. It relates to a driving device.

  A cylinder, a piston slidably accommodated in the cylinder, a rod-shaped driver extending downward from the piston and driving a fixing tool such as a nail or staple into an object to be driven such as wood, and a cylinder surrounding the cylinder Including a housing that forms a reservoir of pressurized air outside, configured to cause the driver to drive a fastener disposed in a nose extending downwardly of the cylinder by abruptly lowering the piston within the cylinder by air pressure, A fixing device driving device in which a bumper that cushions an impact caused by a sudden lowering of a piston is provided on the lower end side of a cylinder is described in, for example, Utility Model Registration No. 2576575 (Patent Document 1). In addition to Patent Document 1, Japanese Patent No. 2876982 (Patent Document 2), Japanese Patent No. 3654219 (Patent Document 3), and Japanese Patent Application Laid-Open No. 2000-141246 are disclosed in Japanese Patent Application Publication No. 2876982 (Patent Document 2). No. 3 (Patent Literature 4), Japanese Patent No. 3267469 (Patent Literature 5) and Japanese Patent No. 3622193 (Patent Literature 6).

Utility Model Registration No. 2576575 Japanese Patent No. 2876982 Japanese Patent No. 3654219 JP 2000-141246 A Japanese Patent No. 3267469 Japanese Patent No. 3622193

  The bumper of the hitting-type fixing device driving apparatus described in Patent Documents 1 to 6 has a vertically long hollow cylindrical shape so as to keep the fixing device driving apparatus small even when high-pressure pressurized air is used. It is composed of a member, and is placed on the lower end side of the cylinder to receive the lower surface of the piston that descends rapidly and cushions the impact. In the bumpers described in Patent Documents 1 to 6, the upper portion and the lower portion are formed in different shapes, and the upper portion that receives the lower surface of the piston is formed in a thick cylindrical shape having the same outer diameter as the cylinder inner diameter. The impact energy at the time of collision is greatly absorbed, and the lower portion on the lower end side of the cylinder is formed in a thin cylindrical shape, and is greatly deformed at the time of piston collision to enhance the buffering effect. For example, in the bumper of Patent Document 1, the inner diameter of the bumper is made larger than the outer diameter of the driver so as to ensure a gap for deformation between the inner peripheral surface of the bumper and the outer peripheral surface of the driver, and the lower portion of the bumper is thin. The outer diameter of the bumper is made smaller than the inner diameter of the cylinder so as to be formed in a cylindrical shape. In the bumper of Patent Document 2, the entire bumper inner diameter is made larger than the driver outer diameter so as to secure a gap for deformation between the bumper inner peripheral surface and the driver outer peripheral surface, and the bumper lower portion is a thin cylindrical shape. Thus, the inner diameter of the bumper is made larger than the outer diameter of the driver. Thus, the bumper which formed the bumper inner diameter larger than the driver outer diameter so that the bumper lower part may be formed in a thin cylindrical shape is also described in Patent Documents 3-6. These bumpers make the lower side part thinner, making it easier to deform the lower side part and improving the absorption of energy applied to the upper side at the time of piston collision, and impact energy due to piston collision on the upper side. It is trying to improve durability while absorbing water. However, these bumpers are configured so that they cannot be deflected radially outward in both the upper and lower portions of the bumpers, and therefore cannot sufficiently absorb impact energy at the time of piston collision.

  Accordingly, an object of the present invention is to provide a fastener driving device that can sufficiently withstand the collision of the piston in the upper portion and has the advantage of improving energy absorption during the piston collision in the lower portion.

  In order to achieve the above object, the present invention provides a cylinder, a piston slidably accommodated in the cylinder, and a rod-shaped driver that extends downward from the piston and drives a fixing tool such as a nail or staple into the driving object. And a housing that surrounds the cylinder and forms a reservoir of pressurized air outside the cylinder, and is disposed on a nose extending downward from the lower end of the cylinder by rapidly lowering the piston in the cylinder Is a fixing device driving device in which a bumper is provided at the lower end side of the cylinder to buffer an impact caused by a sudden lowering of the piston. A hollow cylindrical member formed with a through-hole in which the driver moves up and down, and the bumper is provided at the lower part of the cylinder and at the upper part of the nose. The bumper is formed to have an outer diameter slightly smaller than the outer diameter of the piston at the upper part in contact with the lower surface of the piston, and the outer periphery of the bumper and the inner part of the accommodating part at the lower part adjacent to the upper part of the nose. An outer diameter smaller than the inner diameter of the accommodating portion is formed so as to form a predetermined gap between the peripheries, and the bumper is larger in diameter than the upper and lower portions in the intermediate portion between the upper and lower portions and accommodated. Provided is a fixing device driving apparatus characterized in that it is formed to have an outer diameter substantially equal to the inner diameter of the part.

  As described above, the bumper serving as a buffer member is formed with an outer diameter slightly smaller than the outer diameter of the piston at the upper part, and accommodated so as to form a predetermined gap between the outer periphery of the bumper and the inner periphery of the accommodating part at the lower part. It is formed with an outer diameter smaller than the inner diameter of the section, and has an outer diameter that is larger than the upper and lower portions in the middle section and is almost equal to the inner diameter of the housing section. It can withstand local damage at the top of the bumper, absorbs energy when the piston collides in the lower part, and the middle part is held against the housing part without any gaps. The bumper is reliably supported, and the shape of the bumper makes it possible to keep the fixing tool driving device using high-pressure pressurized air small.

  In the above-described fixing tool driving apparatus, it is preferable that the outer diameter of the lower part of the bumper is substantially equal to the outer diameter of the upper part or smaller than the upper outer diameter. The through hole of the bumper is a conical hole that is formed with an inner diameter that is slightly larger than the outer diameter of the driver at the upper part and that is formed with an inner diameter that is sufficiently larger than the outer diameter of the driver at the lower part and that increases in diameter from the upper part to the lower part It is preferable that it is formed as. Furthermore, it is preferable that a recess having a wall for receiving the outer peripheral surface portion of the upper surface of the bumper is formed on the lower surface of the piston. As a result, local breakage of the upper outer edge of the bumper is reduced, and further, energy when the lower surface of the piston collides with the bumper is distributed to the entire bumper, thereby reducing damage to the bumper.

  A fastener driving device 1 according to an embodiment of the present invention will be described with reference to FIG. The fixing tool driving device 1 includes a cylinder 2 extending in the vertical direction, a piston 3 disposed so as to be slidable in the vertical direction in the cylinder 2, and a fixing tool such as a nail and a staple extending downward from the piston 3 A rod-shaped driver 5 for driving an object to be driven, a housing 7 that covers the cylinder 2 from the outside and forms a reservoir 6 for accumulating pressurized air outside the cylinder 2, and a housing 7 And a handle 9 forming a part of the reservoir 6 as well as forming a grip gripped by an operator. Pressurized air compressed by a compressor or the like is supplied to a supply port (not shown) at the end of the handle 9 to fill the reservoir 6 with pressurized air. Note that the piston 3 and the driver 5 integrally move up and down together, but for the sake of illustration in FIG. 1, the piston 3 and the driver 5 are in the uppermost stationary position on the left side of the center line O. In the right side of the center line O, the piston 3 and the driver 5 are shown in the lowermost driving position.

  A nose 10 is provided below the cylinder 2. A fixing tool such as a nail is fed to the nose 10 from a magazine or the like (not shown) by a feeder (not shown) and fed to the nose 10. The fixing tool is driven out from the tip of the nose by a driver 5 extending from the cylinder 2 and driven into a driving object such as wood. A bumper 11 is provided between the lower end side of the cylinder 2 and the upper portion of the nose 10 so as to absorb a shock caused by a sudden lowering of the piston 3. The bumper 11 is made of a material that absorbs an impact caused by the rapid lowering of the piston 3, and is made of an elastic vibration absorbing material such as synthetic rubber. The bumper 11 as a whole is a cylindrical integrally formed member formed vertically in the axial direction of the cylinder 2, and a through hole 13 through which the driver 5 can move up and down is formed in the shaft center. It consists of a hollow cylindrical member. The bumper 11 is housed and held in a housing portion 14 that is a cylindrical cavity formed between the lower portion of the cylinder 2 and the upper portion of the nose 10.

  When the handle 9 is held and the tip of the nose 10 is pressed against an object to be driven such as wood and the trigger lever 15 is pulled, the pressurized air in the reservoir 6 is supplied into the upper part of the cylinder 2 and the piston 3 1 suddenly moves downward from the left-side stationary position of the center line O to the driving position shown on the right side, and the tip of the driver 5 hits a fixing tool such as a nail on the nose 10 to hit the driving object. Include. When the piston 3 descends rapidly and reaches the upper end side of the nose 10 on the lower end side of the cylinder 2, the bumper 11 provided on the lower end side of the cylinder 2 impacts the piston 3 on the upper end of the nose 10. Buffer to do.

  With reference to FIGS. 2-4, the detail of the bumper 11, the accommodating part 14 relevant to the bumper 11, etc. are demonstrated. The bumper 11 is formed of a cylindrical shock absorbing member that is integrally formed in the axial direction and is formed with a through-hole 13 in which the driver 5 can move up and down. The upper portion 17 that contacts the lower surface of the piston 3 and the nose 10 It has a lower part 18 adjacent to the upper part and an intermediate part 19 between the upper part 17 and the lower part 18. Since the bumper upper portion 17 is subjected to a strong impact of the piston 3, the amount of impact energy by the piston 3 is large, and the upper surface of the bumper upper portion 17 and the adjacent outer peripheral surface are likely to be locally damaged. For this reason, the bumper upper portion 17 is formed to have an outer diameter that forms a gap 21 between the inner peripheral surface of the cylinder 2 and sufficiently keeps the volume so as to sufficiently cope with absorbing impact energy. ing. Specifically, the bumper upper portion 17 is formed to have an outer diameter slightly smaller than the outer diameter of the piston 3 (approximately equal to the inner diameter of the cylinder 2), and the inner diameter of the through hole 13 of the upper portion 17 does not hinder the movement of the driver 5. The outer diameter of the driver 5 is slightly larger than the outer diameter of the driver 5, but is formed to have almost no gap. The outer gap 21 can be deformed to effectively absorb impact energy, and the volume of the upper portion 17 can be reduced. Maintains the impact energy buffering effect and maintains durability against impact energy. Note that the upper surface of the upper portion 17 and the adjacent inner portion are preferably formed in substantially the same shape as the outer peripheral portions of the piston 3 and the driver 5 and are formed in a shape that closely fits when the piston 3 abuts. When the piston 3 is formed in a shape that fits tightly when the piston 3 comes into contact, the piston 3 is also subjected to the action of an air cushion by the bumper 11 to improve the buffering effect.

  Further, as described above, by forming the outer diameter of the bumper upper portion 17 smaller than the outer diameter of the piston 3, the lower surface of the piston 3 has a circular recess having a wall 22 for receiving the outer peripheral surface portion of the upper surface of the bumper upper portion 17. 23 can be formed. The recess 23 on the lower surface of the piston can surround the outer peripheral edge of the bumper upper part 17 that is most susceptible to damage, can reduce local damage on the outer peripheral part of the bumper, and the bumper upper part 17 includes the outer peripheral part. Since the entire upper surface is surrounded, the energy when the lower surface of the piston collides with the bumper is distributed to the entire upper surface of the bumper upper portion 17, which can also reduce local damage to the bumper. Furthermore, the concave portion 23 on the lower surface of the piston 3 enhances the action of the air cushion when surrounding and closely contacting the upper surface of the bumper 11 and contributes to shock energy buffering.

  The bumper 11 is accommodated and held in the accommodating portion 14. The accommodating portion 14 is formed by a lower portion 25 of the cylinder 2 and an upper portion 26 of the nose 10 so that the lower portion of the main body portion is formed in a cylindrical hollow shape resembling a large-diameter wide-mouth bottle shape. In the accommodating portion 14, the upper portion 17 of the bumper 11 and the upper edge portion of the intermediate portion 19 are accommodated in the lower portion 25 of the cylinder 2, and substantially the entire intermediate portion 19 and the bumper lower portion 18 are accommodated in the upper portion 26 of the nose 10. Be contained. The accommodating part 14 similar to the wide-mouth bottle shape confines the received bumper 11 and securely holds it, so that even if the bumper 11 reacts when the piston 3 collides with the bumper 11, the accommodating part 14 bumps from the accommodating part 14. 11 can be prevented from jumping out.

  The impact received by the bumper upper part 17 is transmitted to the bumper lower part 18. The bumper lower portion 18 is sufficiently deformed to absorb the impact energy from the piston 3. For this reason, the bumper lower portion 18 has an inner diameter of the nose upper portion 26 so as to form a large gap 27 between the lower portion of the accommodating portion 14, that is, the inner peripheral surface of the upper portion 26 of the nose 10 and the outer peripheral surface of the bumper lower portion 18. The outer diameter is considerably smaller. By forming the large gap 27, the outer peripheral portion of the bumper lower portion 18 is positively bent to increase the impact energy absorption effect. Further, the outer diameter of the bumper lower portion 18 is formed to be substantially the same as or smaller than the outer diameter of the bumper upper portion 17. Accordingly, the overall shape of the bumper can be kept small without increasing the size of the fixing device driving apparatus, and the overall shape of the bumper can be maintained easily.

  The bumper intermediate portion 19 is formed to have an outer diameter that is larger than the outer diameters of the bumper upper portion 17 and the bumper lower portion 18 and substantially equal to the inner diameter of the lower portion (the nose upper portion 26) of the accommodating portion 14. As described above, the bumper intermediate portion 19 is held without a gap with respect to the lower portion (the nose upper portion 26) of the accommodating portion 14, so that the bumper 11 is prevented from rattling and the bumper is reliably supported.

  The through hole 13 of the bumper 11 is formed with an inner diameter slightly larger than the outer diameter of the driver 5 at the upper portion 17 and formed with an inner diameter sufficiently larger than the outer diameter of the driver 5 at the lower portion 18, and has a larger diameter from the upper portion toward the lower portion. It is formed as a conical hole. With this shape, the upper portion 17 is formed so as to have a volume necessary for receiving the impact energy of the piston 3 without enlarging the entire bumper 11, and it is necessary to absorb the impact energy transmitted to the upper portion 17. A thin-walled lower portion 18 that allows bending and deformation is formed, so that the fastener driving device 1 can be kept small.

  With the above configuration, when the piston 3 collides with the bumper 11, impact energy is concentrated on the bumper upper portion 17, but since the volume of the bumper upper portion 17 is large, local deformation of the bumper upper portion 17 is suppressed and the entire bumper lower portion 18 is suppressed. The deformation is transmitted to the bumper, and the local breakage of the bumper upper portion 17 can be avoided. Further, by providing a recess 23 that surrounds the bumper upper portion 17 on the lower surface of the piston 3, the bumper upper portion 17 is fitted into the recess 23 of the piston 3 and is held by the wall 22 when the piston 3 collides with the bumper 11. Therefore, local deformation of the upper outer peripheral edge is prevented and local breakage is suppressed.

  The impact energy to the upper part 17 is transmitted to the intermediate part 19. Since the intermediate portion 19 is formed with an outer diameter larger than that of the upper portion 17 and has a cross-sectional area larger than that of the upper portion 17, impact energy from the upper portion 17 is further dispersed throughout the intermediate portion 19. The bumper intermediate portion 19 is held without any gap with respect to the lower portion (the nose upper portion 26) of the accommodating portion 14, so that the bumper 11 is prevented from rattling and the bumper is reliably supported. The impact energy transmitted to the intermediate portion 19 is transmitted to the bumper lower portion 18. The transmitted impact energy is more easily deformed than the bumper upper portion 17 and the intermediate portion 19 because the thickness of the bumper lower portion 18 is thinner than that of the bumper upper portion 17 and the bumper intermediate portion 19. Therefore, a uniform compressive stress is dispersed inside the bumper lower portion 18 to maintain a high shock energy buffering effect, and to extend the life of the bumper 11.

It is sectional drawing of the principal part of the fixing tool driving device which concerns on embodiment of this invention. FIG. 2 is an enlarged cross-sectional view of a bumper and its vicinity of the fastener driving device of FIG. 1. It is a perspective view of a bumper. It is a longitudinal cross-sectional view of a bumper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing device driving device 2 Cylinder 3 Piston 5 Driver 6 Reservoir 7 Housing 9 Handle 10 Nose 11 Bumper 13 Through-hole 14 Accommodating part 15 Trigger lever 17 Bumper upper part 18 Bumper lower part 19 Bumper intermediate part 21 Gap 22 Wall 23 Recessed part 25 Cylinder lower part 26 Nose upper part 27 Clearance

Claims (4)

A cylinder, a piston slidably accommodated in the cylinder, a rod-like driver extending downward from the piston and driving a fixing tool such as a nail or a staple into the driven object, and a cylinder surrounding the cylinder And a housing that forms a reservoir of pressurized air outside the cylinder, the piston is rapidly lowered in the cylinder, and a fixing tool disposed on a nose extending downward from the lower end of the cylinder is hit by the driver. In the fixing device driving device in which the lower end side of the cylinder is provided with a bumper that cushions an impact caused by the rapid lowering of the piston,
The bumper is a hollow cylindrical member having a vertically long cylindrical shape extending in the axial direction and having a through hole in which the driver moves up and down. The bumper is formed at a lower portion of the cylinder and above the nose. The bumper is accommodated in a cylindrical accommodating portion provided, and the bumper is formed to have an outer diameter slightly smaller than an outer diameter of the piston at an upper portion contacting the lower surface of the piston, and the bumper is disposed at a lower portion adjacent to the upper portion of the nose. An outer diameter smaller than the inner diameter of the housing portion so as to form a predetermined gap between the outer periphery of the housing portion and the inner periphery of the housing portion, and the bumper is an intermediate portion between the upper portion and the lower portion The fixing device driving device according to claim 1, wherein the fixing device driving device is formed to have an outer diameter larger than the upper portion and the lower portion and substantially equal to the inner diameter of the housing portion.   The apparatus according to claim 1, wherein the bumper has an outer diameter of the lower portion that is substantially equal to or smaller than an outer diameter of the upper portion.   3. The apparatus according to claim 1, wherein the through hole of the bumper has an inner diameter substantially equal to or slightly larger than an outer diameter of the driver at an upper portion and an inner diameter sufficiently larger than an outer diameter of the driver at a lower portion. And is formed as a conical hole having a large diameter from the upper part toward the lower part.   The apparatus according to any one of claims 1 to 3, wherein a recess having a wall for receiving an outer peripheral edge of the bumper upper surface is formed on the lower surface of the piston.

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